Merge "Enable error level for the TruthAssertExpected bug pattern in ErrorProne"
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 76e1f82..84e68ed 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -5637,7 +5637,7 @@
 Email address that Gerrit refers to itself as when it creates a
 new Git commit, such as a merge commit during change submission.
 +
-If not set, Gerrit generates this as "gerrit@`hostname`", where
+If not set, Gerrit generates this as "gerrit@``hostname``", where
 `hostname` is the hostname of the system Gerrit is running on.
 +
 By default, not set, generating the value at startup.
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 2b6796b..d83ef0e 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -600,8 +600,9 @@
 ----
 
 As a response, two link:#change-info[ChangeInfo] entities are returned
-that describe information added and removed from the `old` change state.
-Only fields that differ between the change's two states are returned.
+that describe information added and removed from the `old` change state, and
+the two link:#change-info[ChangeInfo] entities that generated the diff are
+returned. Only fields that differ between the change's two states are returned.
 
 .Response
 ----
@@ -625,9 +626,55 @@
       "topic": "new-topic"
     },
     "removed": {
-      "updated": "2013-02-20 12:05:34.111000000",
+      "updated": "2013-02-01 09:59:32.126000000",
       "topic": "old-topic"
-    }
+    },
+    "old_change_info": {
+      "id": "myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "project": "myProject",
+      "branch": "master",
+      "attention_set": [],
+      "change_id": "I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "subject": "Implementing Feature X",
+      "status": "NEW",
+      "topic": "old-topic",
+      "created": "2013-02-01 09:59:32.126000000",
+      "updated": "2013-02-01 09:59:32.126000000",
+      "mergeable": true,
+      "insertions": 34,
+      "deletions": 101,
+      "_number": 3965,
+      "owner": {
+        "name": "John Doe"
+      }
+    },
+    "new_change_info": {
+      "id": "myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "project": "myProject",
+      "branch": "master",
+      "attention_set": [
+        {
+          "account": {
+            "name": "John Doe"
+          },
+         "last_update": "2013-02-21 11:16:36.775000000",
+         "reason": "reviewer or cc replied"
+        }
+      ],
+      "change_id": "I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "subject": "Implementing Feature X",
+      "status": "NEW",
+      "topic": "new-topic",
+      "created": "2013-02-01 09:59:32.126000000",
+      "updated": "2013-02-21 11:16:36.775000000",
+      "mergeable": true,
+      "insertions": 34,
+      "deletions": 101,
+      "_number": 3965,
+      "owner": {
+        "name": "John Doe"
+      }
+    },
   }
 ----
 
@@ -3228,6 +3275,8 @@
 * are visible to the calling user
 * are not already reviewer on the change
 * don't own the change
+* are not service users (unless
+  link:config.html#suggest.skipServiceUsers[skipServiceUsers] is set to `false`)
 
 Groups can be excluded from the results by specifying the 'exclude-groups'
 request parameter:
@@ -6486,6 +6535,9 @@
 Actions the caller might be able to perform on this revision. The
 information is a map of view name to link:#action-info[ActionInfo]
 entities.
+|`submit_records`             ||
+List of the link:rest-api-changes.html#submit-record-info[SubmitRecordInfo]
+containing the submit records for the change at the latest patchset.
 |`requirements`             |optional|
 List of the link:rest-api-changes.html#requirement[requirements] to be met before this change
 can be submitted. This field is deprecated in favour of `submit_requirements`.
@@ -8127,6 +8179,37 @@
 the failure of the rule predicate.
 |===========================
 
+[[submit-record-info]]
+=== SubmitRecordInfo
+The `SubmitRecordInfo` entity describes results from a submit_rule.
+
+[options="header",cols="1,^1,5"]
+|===========================
+|Field Name      ||Description
+|`rule_name`||
+The name of the submit rule that created this submit record. The submit rule is
+specified in the form of "$plugin~$rule" where `$plugin` is the plugin name
+and `$rule` is the name of the class that implemented the submit rule.
+|`status`||
+`OK`, the change can be submitted. +
+`NOT_READY`, additional labels are required before submit. +
+`CLOSED`, closed changes cannot be submitted. +
+`FORCED`, the change was submitted bypassing the submit rule. +
+`RULE_ERROR`, rule code failed with an error.
+|`labels`|optional|
+A list of labels, each containing the following fields. +
+  * `label`: the label name. +
+  * `status`: the label status: {`OK`, `REJECT`, `MAY`, `NEED`, `IMPOSSIBLE`}. +
+  * `appliedBy`: the link:rest-api-accounts.html#account-info[AccountInfo]
+  that applied the vote to the label.
+|`requirements`|optional|
+List of the link:rest-api-changes.html#requirement[requirements] to be met
+before this change can be submitted.
+|`error_message`|optional|
+When status is RULE_ERROR this message provides some text describing
+the failure of the rule predicate.
+|===========================
+
 [[submit-requirement-expression-info]]
 === SubmitRequirementExpressionInfo
 The `SubmitRequirementExpressionInfo` describes the result of evaluating a
diff --git a/WORKSPACE b/WORKSPACE
index 5c38224..93cae7d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -922,7 +922,6 @@
 
 yarn_install(
     name = "npm",
-    data = ["//:twinkie.patch"],
     frozen_lockfile = False,
     package_json = "//:package.json",
     package_path = "",
diff --git a/java/com/google/gerrit/acceptance/ExtensionRegistry.java b/java/com/google/gerrit/acceptance/ExtensionRegistry.java
index 85c4c13..1e5598e 100644
--- a/java/com/google/gerrit/acceptance/ExtensionRegistry.java
+++ b/java/com/google/gerrit/acceptance/ExtensionRegistry.java
@@ -25,6 +25,8 @@
 import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
 import com.google.gerrit.extensions.events.GroupIndexedListener;
 import com.google.gerrit.extensions.events.ProjectIndexedListener;
+import com.google.gerrit.extensions.events.ReviewerAddedListener;
+import com.google.gerrit.extensions.events.ReviewerDeletedListener;
 import com.google.gerrit.extensions.events.RevisionCreatedListener;
 import com.google.gerrit.extensions.events.TopicEditedListener;
 import com.google.gerrit.extensions.events.WorkInProgressStateChangedListener;
@@ -91,6 +93,8 @@
   private final DynamicMap<ProjectConfigEntry> pluginConfigEntries;
   private final DynamicSet<PluginPushOption> pluginPushOptions;
   private final DynamicSet<OnPostReview> onPostReviews;
+  private final DynamicSet<ReviewerAddedListener> reviewerAddedListeners;
+  private final DynamicSet<ReviewerDeletedListener> reviewerDeletedListeners;
 
   @Inject
   ExtensionRegistry(
@@ -125,7 +129,9 @@
       DynamicMap<PluginProjectPermissionDefinition> pluginProjectPermissionDefinitions,
       DynamicMap<ProjectConfigEntry> pluginConfigEntries,
       DynamicSet<PluginPushOption> pluginPushOption,
-      DynamicSet<OnPostReview> onPostReviews) {
+      DynamicSet<OnPostReview> onPostReviews,
+      DynamicSet<ReviewerAddedListener> reviewerAddedListeners,
+      DynamicSet<ReviewerDeletedListener> reviewerDeletedListeners) {
     this.accountIndexedListeners = accountIndexedListeners;
     this.changeIndexedListeners = changeIndexedListeners;
     this.groupIndexedListeners = groupIndexedListeners;
@@ -158,6 +164,8 @@
     this.pluginConfigEntries = pluginConfigEntries;
     this.pluginPushOptions = pluginPushOption;
     this.onPostReviews = onPostReviews;
+    this.reviewerAddedListeners = reviewerAddedListeners;
+    this.reviewerDeletedListeners = reviewerDeletedListeners;
   }
 
   public Registration newRegistration() {
@@ -302,6 +310,14 @@
       return add(onPostReviews, onPostReview);
     }
 
+    public Registration add(ReviewerAddedListener reviewerAddedListener) {
+      return add(reviewerAddedListeners, reviewerAddedListener);
+    }
+
+    public Registration add(ReviewerDeletedListener reviewerDeletedListener) {
+      return add(reviewerDeletedListeners, reviewerDeletedListener);
+    }
+
     private <T> Registration add(DynamicSet<T> dynamicSet, T extension) {
       return add(dynamicSet, extension, "gerrit");
     }
diff --git a/java/com/google/gerrit/entities/SubmitRequirementResult.java b/java/com/google/gerrit/entities/SubmitRequirementResult.java
index 4f2f2f6..b7fa398 100644
--- a/java/com/google/gerrit/entities/SubmitRequirementResult.java
+++ b/java/com/google/gerrit/entities/SubmitRequirementResult.java
@@ -64,6 +64,13 @@
     }
   }
 
+  /** Returns true if the submit requirement is fulfilled and can allow change submission. */
+  @Memoized
+  public boolean fulfilled() {
+    Status s = status();
+    return s == Status.SATISFIED || s == Status.OVERRIDDEN || s == Status.NOT_APPLICABLE;
+  }
+
   public static Builder builder() {
     return new AutoValue_SubmitRequirementResult.Builder();
   }
diff --git a/java/com/google/gerrit/extensions/client/ProjectWatchInfo.java b/java/com/google/gerrit/extensions/client/ProjectWatchInfo.java
index 3c20ff7..8f5af76 100644
--- a/java/com/google/gerrit/extensions/client/ProjectWatchInfo.java
+++ b/java/com/google/gerrit/extensions/client/ProjectWatchInfo.java
@@ -54,6 +54,7 @@
   }
 
   @Override
+  @SuppressWarnings("OrphanedFormatString")
   public String toString() {
     StringBuilder b = new StringBuilder();
     b.append(project);
diff --git a/java/com/google/gerrit/extensions/common/ChangeInfo.java b/java/com/google/gerrit/extensions/common/ChangeInfo.java
index 6afe8ac..2bb3dd7 100644
--- a/java/com/google/gerrit/extensions/common/ChangeInfo.java
+++ b/java/com/google/gerrit/extensions/common/ChangeInfo.java
@@ -112,6 +112,7 @@
   public List<PluginDefinedInfo> plugins;
   public Collection<TrackingIdInfo> trackingIds;
   public Collection<LegacySubmitRequirementInfo> requirements;
+  public Collection<SubmitRecordInfo> submitRecords;
   public Collection<SubmitRequirementResultInfo> submitRequirements;
 
   public ChangeInfo() {}
diff --git a/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java b/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java
index ba5e323..ad112d3 100644
--- a/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java
+++ b/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java
@@ -63,9 +63,12 @@
    */
   public static ChangeInfoDifference getDifference(
       ChangeInfo oldChangeInfo, ChangeInfo newChangeInfo) {
-    return ChangeInfoDifference.create(
-        /* added= */ getAdded(oldChangeInfo, newChangeInfo),
-        /* removed= */ getAdded(newChangeInfo, oldChangeInfo));
+    return ChangeInfoDifference.builder()
+        .setOldChangeInfo(oldChangeInfo)
+        .setNewChangeInfo(newChangeInfo)
+        .setAdded(getAdded(oldChangeInfo, newChangeInfo))
+        .setRemoved(getAdded(newChangeInfo, oldChangeInfo))
+        .build();
   }
 
   @SuppressWarnings("unchecked") // reflection is used to construct instances of T
diff --git a/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java b/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java
index 269c673..997c3ee 100644
--- a/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java
+++ b/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java
@@ -20,11 +20,29 @@
 @AutoValue
 public abstract class ChangeInfoDifference {
 
+  public abstract ChangeInfo oldChangeInfo();
+
+  public abstract ChangeInfo newChangeInfo();
+
   public abstract ChangeInfo added();
 
   public abstract ChangeInfo removed();
 
-  public static ChangeInfoDifference create(ChangeInfo added, ChangeInfo removed) {
-    return new AutoValue_ChangeInfoDifference(added, removed);
+  public static Builder builder() {
+    return new AutoValue_ChangeInfoDifference.Builder();
+  }
+
+  @AutoValue.Builder
+  public abstract static class Builder {
+
+    public abstract Builder setOldChangeInfo(ChangeInfo oldChangeInfo);
+
+    public abstract Builder setNewChangeInfo(ChangeInfo newChangeInfo);
+
+    public abstract Builder setAdded(ChangeInfo added);
+
+    public abstract Builder setRemoved(ChangeInfo removed);
+
+    public abstract ChangeInfoDifference build();
   }
 }
diff --git a/java/com/google/gerrit/extensions/common/SubmitRecordInfo.java b/java/com/google/gerrit/extensions/common/SubmitRecordInfo.java
new file mode 100644
index 0000000..09c9841
--- /dev/null
+++ b/java/com/google/gerrit/extensions/common/SubmitRecordInfo.java
@@ -0,0 +1,48 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.extensions.common;
+
+import java.util.List;
+
+/** API response containing a {@link com.google.gerrit.entities.SubmitRecord} entity. */
+public class SubmitRecordInfo {
+  public enum Status {
+    OK,
+    NOT_READY,
+    CLOSED,
+    FORCED,
+    RULE_ERROR
+  }
+
+  public static class Label {
+    public enum Status {
+      OK,
+      REJECT,
+      NEED,
+      MAY,
+      IMPOSSIBLE
+    }
+
+    public String label;
+    public Status status;
+    public AccountInfo appliedBy;
+  }
+
+  public String ruleName;
+  public Status status;
+  public List<Label> labels;
+  public List<LegacySubmitRequirementInfo> requirements;
+  public String errorMessage;
+}
diff --git a/java/com/google/gerrit/server/CommentsUtil.java b/java/com/google/gerrit/server/CommentsUtil.java
index b18f499..ba9f6d6 100644
--- a/java/com/google/gerrit/server/CommentsUtil.java
+++ b/java/com/google/gerrit/server/CommentsUtil.java
@@ -450,8 +450,6 @@
   /**
    * Get NoteDb draft refs for a change.
    *
-   * <p>Works if NoteDb is not enabled, but the results are not meaningful.
-   *
    * <p>This is just a simple ref scan, so the results may potentially include refs for zombie draft
    * comments. A zombie draft is one which has been published but the write to delete the draft ref
    * from All-Users failed.
diff --git a/java/com/google/gerrit/server/approval/ApprovalInference.java b/java/com/google/gerrit/server/approval/ApprovalInference.java
index 4cb080a..695997a 100644
--- a/java/com/google/gerrit/server/approval/ApprovalInference.java
+++ b/java/com/google/gerrit/server/approval/ApprovalInference.java
@@ -54,6 +54,7 @@
 import java.util.Map;
 import java.util.Optional;
 import org.eclipse.jgit.lib.Config;
+import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.revwalk.RevWalk;
 
 /**
@@ -134,8 +135,9 @@
       PatchSet.Id psId,
       ChangeKind kind,
       LabelType type,
-      @Nullable Map<String, FileDiffOutput> modifiedFiles,
-      @Nullable Map<String, FileDiffOutput> modifiedFilesLastPatchset) {
+      @Nullable Map<String, FileDiffOutput> baseVsCurrentDiff,
+      @Nullable Map<String, FileDiffOutput> baseVsPriorDiff,
+      @Nullable Map<String, FileDiffOutput> priorVsCurrentDiff) {
     int n = psa.key().patchSetId().get();
     checkArgument(n != psId.get());
 
@@ -185,7 +187,8 @@
           project.getName());
       return true;
     } else if (type.isCopyAllScoresIfListOfFilesDidNotChange()
-        && listOfFilesUnchangedPredicate.match(modifiedFiles, modifiedFilesLastPatchset)) {
+        && listOfFilesUnchangedPredicate.match(
+            baseVsCurrentDiff, baseVsPriorDiff, priorVsCurrentDiff)) {
       logger.atFine().log(
           "approval %d on label %s of patch set %d of change %d can be copied"
               + " to patch set %d because the label has set "
@@ -402,8 +405,9 @@
         priorPatchSet.getValue().id().changeId(),
         changeKind);
 
-    Map<String, FileDiffOutput> modifiedFiles = null;
-    Map<String, FileDiffOutput> modifiedFilesLastPatchSet = null;
+    Map<String, FileDiffOutput> baseVsCurrent = null;
+    Map<String, FileDiffOutput> baseVsPrior = null;
+    Map<String, FileDiffOutput> priorVsCurrent = null;
     LabelTypes labelTypes = project.getLabelTypes();
     for (PatchSetApproval psa : priorApprovals) {
       if (resultByUser.contains(psa.label(), psa.accountId())) {
@@ -411,11 +415,13 @@
       }
       Optional<LabelType> type = labelTypes.byLabel(psa.labelId());
       // Only compute modified files if there is a relevant label, since this is expensive.
-      if (modifiedFiles == null
+      if (baseVsCurrent == null
           && type.isPresent()
           && type.get().isCopyAllScoresIfListOfFilesDidNotChange()) {
-        modifiedFiles = listModifiedFiles(project, patchSet);
-        modifiedFilesLastPatchSet = listModifiedFiles(project, priorPatchSet.getValue());
+        baseVsCurrent = listModifiedFiles(project, patchSet);
+        baseVsPrior = listModifiedFiles(project, priorPatchSet.getValue());
+        priorVsCurrent =
+            listModifiedFiles(project, priorPatchSet.getValue().commitId(), patchSet.commitId());
       }
       if (!type.isPresent()) {
         logger.atFine().log(
@@ -435,8 +441,9 @@
               patchSet.id(),
               changeKind,
               type.get(),
-              modifiedFiles,
-              modifiedFilesLastPatchSet)
+              baseVsCurrent,
+              baseVsPrior,
+              priorVsCurrent)
           && !canCopyBasedOnCopyCondition(notes, psa, patchSet, type.get(), changeKind)) {
         continue;
       }
@@ -465,4 +472,21 @@
           ex);
     }
   }
+
+  /**
+   * Gets the modified files between two commits corresponding to different patchsets of the same
+   * change.
+   */
+  private Map<String, FileDiffOutput> listModifiedFiles(
+      ProjectState project, ObjectId sourceCommit, ObjectId targetCommit) {
+    try {
+      return diffOperations.listModifiedFiles(project.getNameKey(), sourceCommit, targetCommit);
+    } catch (DiffNotAvailableException ex) {
+      throw new StorageException(
+          "failed to compute difference in files, so won't copy"
+              + " votes on labels even if list of files is the same and "
+              + "copyAllIfListOfFilesDidNotChange",
+          ex);
+    }
+  }
 }
diff --git a/java/com/google/gerrit/server/change/AddReviewersOp.java b/java/com/google/gerrit/server/change/AddReviewersOp.java
index a333ce5..cbbd01a 100644
--- a/java/com/google/gerrit/server/change/AddReviewersOp.java
+++ b/java/com/google/gerrit/server/change/AddReviewersOp.java
@@ -219,8 +219,13 @@
               .map(r -> accountCache.get(r.accountId()))
               .flatMap(Streams::stream)
               .collect(toList());
-      reviewerAdded.fire(
-          ctx.getChangeData(change), patchSet, reviewers, ctx.getAccount(), ctx.getWhen());
+      eventSender =
+          () ->
+              reviewerAdded.fire(
+                  ctx.getChangeData(change), patchSet, reviewers, ctx.getAccount(), ctx.getWhen());
+      if (sendEvent) {
+        sendEvent();
+      }
     }
   }
 }
diff --git a/java/com/google/gerrit/server/change/ChangeJson.java b/java/com/google/gerrit/server/change/ChangeJson.java
index 5efcf59..db25dc7 100644
--- a/java/com/google/gerrit/server/change/ChangeJson.java
+++ b/java/com/google/gerrit/server/change/ChangeJson.java
@@ -79,6 +79,7 @@
 import com.google.gerrit.extensions.common.ProblemInfo;
 import com.google.gerrit.extensions.common.ReviewerUpdateInfo;
 import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.common.SubmitRecordInfo;
 import com.google.gerrit.extensions.common.SubmitRequirementExpressionInfo;
 import com.google.gerrit.extensions.common.SubmitRequirementResultInfo;
 import com.google.gerrit.extensions.common.TrackingIdInfo;
@@ -369,6 +370,14 @@
     return reqInfos;
   }
 
+  private Collection<SubmitRecordInfo> submitRecordsFor(ChangeData cd) {
+    List<SubmitRecordInfo> submitRecordInfos = new ArrayList<>();
+    for (SubmitRecord record : cd.submitRecords(SUBMIT_RULE_OPTIONS_STRICT)) {
+      submitRecordInfos.add(submitRecordToInfo(record));
+    }
+    return submitRecordInfos;
+  }
+
   private static Collection<SubmitRequirementResultInfo> submitRequirementsFor(ChangeData cd) {
     Collection<SubmitRequirementResultInfo> reqInfos = new ArrayList<>();
     Map<SubmitRequirement, SubmitRequirementResult> requirements = cd.submitRequirements();
@@ -383,6 +392,34 @@
     return new LegacySubmitRequirementInfo(status.name(), req.fallbackText(), req.type());
   }
 
+  private SubmitRecordInfo submitRecordToInfo(SubmitRecord record) {
+    SubmitRecordInfo info = new SubmitRecordInfo();
+    if (record.status != null) {
+      info.status = SubmitRecordInfo.Status.valueOf(record.status.name());
+    }
+    info.ruleName = record.ruleName;
+    info.errorMessage = record.errorMessage;
+    if (record.labels != null) {
+      info.labels = new ArrayList<>();
+      for (SubmitRecord.Label label : record.labels) {
+        SubmitRecordInfo.Label labelInfo = new SubmitRecordInfo.Label();
+        labelInfo.label = label.label;
+        if (label.status != null) {
+          labelInfo.status = SubmitRecordInfo.Label.Status.valueOf(label.status.name());
+        }
+        labelInfo.appliedBy = accountLoader.get(label.appliedBy);
+        info.labels.add(labelInfo);
+      }
+    }
+    if (record.requirements != null) {
+      info.requirements = new ArrayList<>();
+      for (LegacySubmitRequirement requirement : record.requirements) {
+        info.requirements.add(requirementToInfo(requirement, record.status));
+      }
+    }
+    return info;
+  }
+
   private static SubmitRequirementResultInfo submitRequirementToInfo(
       SubmitRequirement req, SubmitRequirementResult result) {
     SubmitRequirementResultInfo info = new SubmitRequirementResultInfo();
@@ -662,6 +699,7 @@
 
     out.labels = labelsJson.labelsFor(accountLoader, cd, has(LABELS), has(DETAILED_LABELS));
     out.requirements = requirementsFor(cd);
+    out.submitRecords = submitRecordsFor(cd);
     if (has(SUBMIT_REQUIREMENTS)) {
       out.submitRequirements = submitRequirementsFor(cd);
     }
diff --git a/java/com/google/gerrit/server/change/DeleteReviewerOp.java b/java/com/google/gerrit/server/change/DeleteReviewerOp.java
index a26f107..1e40429 100644
--- a/java/com/google/gerrit/server/change/DeleteReviewerOp.java
+++ b/java/com/google/gerrit/server/change/DeleteReviewerOp.java
@@ -202,16 +202,23 @@
             "Cannot email update for change %s", currChange.getId());
       }
     }
-    reviewerDeleted.fire(
-        ctx.getChangeData(currChange),
-        patchSet,
-        accountCache.get(reviewer.id()).orElse(AccountState.forAccount(reviewer)),
-        ctx.getAccount(),
-        mailMessage,
-        newApprovals,
-        oldApprovals,
-        notify.handling(),
-        ctx.getWhen());
+
+    NotifyHandling notifyHandling = notify.handling();
+    eventSender =
+        () ->
+            reviewerDeleted.fire(
+                ctx.getChangeData(currChange),
+                patchSet,
+                accountCache.get(reviewer.id()).orElse(AccountState.forAccount(reviewer)),
+                ctx.getAccount(),
+                mailMessage,
+                newApprovals,
+                oldApprovals,
+                notifyHandling,
+                ctx.getWhen());
+    if (sendEvent) {
+      sendEvent();
+    }
   }
 
   private Iterable<PatchSetApproval> approvals(ChangeContext ctx, Account.Id accountId) {
diff --git a/java/com/google/gerrit/server/change/GetRelatedChangesUtil.java b/java/com/google/gerrit/server/change/GetRelatedChangesUtil.java
new file mode 100644
index 0000000..b1f9726
--- /dev/null
+++ b/java/com/google/gerrit/server/change/GetRelatedChangesUtil.java
@@ -0,0 +1,119 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.change;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static java.util.stream.Collectors.toSet;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.flogger.FluentLogger;
+import com.google.gerrit.entities.PatchSet;
+import com.google.gerrit.index.IndexConfig;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gerrit.server.query.change.InternalChangeQuery;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+
+/** Utility class that gets the ancestor changes and the descendent changes of a specific change. */
+@Singleton
+public class GetRelatedChangesUtil {
+  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
+
+  private final Provider<InternalChangeQuery> queryProvider;
+  private final RelatedChangesSorter sorter;
+  private final IndexConfig indexConfig;
+  private final ChangeData.Factory changeDataFactory;
+
+  @Inject
+  GetRelatedChangesUtil(
+      Provider<InternalChangeQuery> queryProvider,
+      RelatedChangesSorter sorter,
+      IndexConfig indexConfig,
+      ChangeData.Factory changeDataFactory) {
+    this.queryProvider = queryProvider;
+    this.sorter = sorter;
+    this.indexConfig = indexConfig;
+    this.changeDataFactory = changeDataFactory;
+  }
+
+  /**
+   * Gets related changes of a specific change revision.
+   *
+   * @param changeData the change of the inputted revision.
+   * @param basePs the revision that the method checks for related changes.
+   * @return list of related changes, sorted via {@link RelatedChangesSorter}
+   */
+  public List<RelatedChangesSorter.PatchSetData> getRelated(ChangeData changeData, PatchSet basePs)
+      throws IOException, PermissionBackendException {
+    Set<String> groups = getAllGroups(changeData.patchSets());
+    logger.atFine().log("groups = %s", groups);
+    if (groups.isEmpty()) {
+      return Collections.emptyList();
+    }
+
+    List<ChangeData> cds =
+        InternalChangeQuery.byProjectGroups(
+            queryProvider, indexConfig, changeData.project(), groups);
+    if (cds.isEmpty()) {
+      return Collections.emptyList();
+    }
+    if (cds.size() == 1 && cds.get(0).getId().equals(changeData.getId())) {
+      return Collections.emptyList();
+    }
+
+    cds = reloadChangeIfStale(cds, changeData, basePs);
+
+    return sorter.sort(cds, basePs);
+  }
+
+  private List<ChangeData> reloadChangeIfStale(
+      List<ChangeData> changeDatasFromIndex, ChangeData wantedChange, PatchSet wantedPs) {
+    checkArgument(
+        wantedChange.getId().equals(wantedPs.id().changeId()),
+        "change of wantedPs (%s) doesn't match wantedChange (%s)",
+        wantedPs.id().changeId(),
+        wantedChange.getId());
+
+    List<ChangeData> changeDatas = new ArrayList<>(changeDatasFromIndex.size() + 1);
+    changeDatas.addAll(changeDatasFromIndex);
+
+    // Reload the change in case the patch set is absent.
+    changeDatas.stream()
+        .filter(
+            cd -> cd.getId().equals(wantedPs.id().changeId()) && cd.patchSet(wantedPs.id()) == null)
+        .forEach(ChangeData::reloadChange);
+
+    if (changeDatas.stream().noneMatch(cd -> cd.getId().equals(wantedPs.id().changeId()))) {
+      // The change of the wanted patch set is missing in the result from the index.
+      // Load it from NoteDb and add it to the result.
+      changeDatas.add(changeDataFactory.create(wantedChange.change()));
+    }
+
+    return changeDatas;
+  }
+
+  @VisibleForTesting
+  public static Set<String> getAllGroups(Collection<PatchSet> patchSets) {
+    return patchSets.stream().flatMap(ps -> ps.groups().stream()).collect(toSet());
+  }
+}
diff --git a/java/com/google/gerrit/server/restapi/change/RelatedChangesSorter.java b/java/com/google/gerrit/server/change/RelatedChangesSorter.java
similarity index 96%
rename from java/com/google/gerrit/server/restapi/change/RelatedChangesSorter.java
rename to java/com/google/gerrit/server/change/RelatedChangesSorter.java
index 0634081..547452e 100644
--- a/java/com/google/gerrit/server/restapi/change/RelatedChangesSorter.java
+++ b/java/com/google/gerrit/server/change/RelatedChangesSorter.java
@@ -11,8 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-
-package com.google.gerrit.server.restapi.change;
+package com.google.gerrit.server.change;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static java.util.Objects.requireNonNull;
@@ -30,6 +29,7 @@
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.server.change.RelatedChangesSorter.PatchSetData;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.permissions.ChangePermission;
 import com.google.gerrit.server.permissions.PermissionBackend;
@@ -57,7 +57,7 @@
 import org.eclipse.jgit.revwalk.RevWalk;
 
 @Singleton
-class RelatedChangesSorter {
+public class RelatedChangesSorter {
   private final GitRepositoryManager repoManager;
   private final PermissionBackend permissionBackend;
   private final ProjectCache projectCache;
@@ -247,23 +247,23 @@
   }
 
   @AutoValue
-  abstract static class PatchSetData {
+  public abstract static class PatchSetData {
     @VisibleForTesting
     static PatchSetData create(ChangeData cd, PatchSet ps, RevCommit commit) {
       return new AutoValue_RelatedChangesSorter_PatchSetData(cd, ps, commit);
     }
 
-    abstract ChangeData data();
+    public abstract ChangeData data();
 
-    abstract PatchSet patchSet();
+    public abstract PatchSet patchSet();
 
-    abstract RevCommit commit();
+    public abstract RevCommit commit();
 
-    PatchSet.Id psId() {
+    public PatchSet.Id psId() {
       return patchSet().id();
     }
 
-    Change.Id id() {
+    public Change.Id id() {
       return psId().changeId();
     }
 
diff --git a/java/com/google/gerrit/server/change/ReviewerOp.java b/java/com/google/gerrit/server/change/ReviewerOp.java
index 716ac5e..12227c2 100644
--- a/java/com/google/gerrit/server/change/ReviewerOp.java
+++ b/java/com/google/gerrit/server/change/ReviewerOp.java
@@ -32,6 +32,8 @@
 
 public class ReviewerOp implements BatchUpdateOp {
   protected boolean sendEmail = true;
+  protected boolean sendEvent = true;
+  protected Runnable eventSender = () -> {};
   protected PatchSet patchSet;
   protected Result opResult;
 
@@ -42,6 +44,14 @@
     this.sendEmail = false;
   }
 
+  public void suppressEvent() {
+    this.sendEvent = false;
+  }
+
+  public void sendEvent() {
+    eventSender.run();
+  }
+
   void setPatchSet(PatchSet patchSet) {
     this.patchSet = requireNonNull(patchSet);
   }
diff --git a/java/com/google/gerrit/server/notedb/CommitRewriter.java b/java/com/google/gerrit/server/notedb/CommitRewriter.java
index 7d743dc..e940b1e 100644
--- a/java/com/google/gerrit/server/notedb/CommitRewriter.java
+++ b/java/com/google/gerrit/server/notedb/CommitRewriter.java
@@ -20,6 +20,7 @@
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_LABEL;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_REAL_USER;
 import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_SUBMITTED_WITH;
+import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_TAG;
 import static com.google.gerrit.server.util.AccountTemplateUtil.ACCOUNT_TEMPLATE_PATTERN;
 import static com.google.gerrit.server.util.AccountTemplateUtil.ACCOUNT_TEMPLATE_REGEX;
 
@@ -39,6 +40,7 @@
 import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.git.RefUpdateUtil;
 import com.google.gerrit.json.OutputFormat;
+import com.google.gerrit.server.ChangeMessagesUtil;
 import com.google.gerrit.server.account.AccountCache;
 import com.google.gerrit.server.account.AccountState;
 import com.google.gerrit.server.account.externalids.ExternalId;
@@ -58,7 +60,6 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
@@ -170,7 +171,8 @@
       Pattern.compile("Assignee changed from: (.*) to: (.*)");
 
   private static final Pattern REMOVED_REVIEWER_PATTERN =
-      Pattern.compile("Removed (cc|reviewer) (.*)(\\.| with the following votes)");
+      Pattern.compile(
+          "Removed (cc|reviewer) (.*)(\\.| with the following votes:\n.*)", Pattern.DOTALL);
 
   private static final Pattern REMOVED_VOTE_PATTERN = Pattern.compile("Removed (.*) by (.*)");
 
@@ -186,12 +188,18 @@
 
   private static final Pattern ON_CODE_OWNER_ADD_REVIEWER_PATTERN =
       Pattern.compile("(.*) who was added as reviewer owns the following files");
+
+  private static final String CODE_OWNER_ADD_REVIEWER_TAG =
+      ChangeMessagesUtil.AUTOGENERATED_BY_GERRIT_TAG_PREFIX + "code-owners:addReviewer";
+
   private static final String ON_CODE_OWNER_APPROVAL_REGEX = "code-owner approved by (.*):";
   private static final String ON_CODE_OWNER_OVERRIDE_REGEX =
       "code-owners submit requirement .* overridden by (.*)";
 
   private static final Pattern ON_CODE_OWNER_REVIEW_PATTERN =
       Pattern.compile(ON_CODE_OWNER_APPROVAL_REGEX + "|" + ON_CODE_OWNER_OVERRIDE_REGEX);
+  private static final Pattern ON_CODE_OWNER_POST_REVIEW_PATTERN =
+      Pattern.compile("Patch Set [0-9]+:[\\s\\S]*By (voting|removing)[\\s\\S]*");
 
   private static final Pattern REPLY_BY_REASON_PATTERN =
       Pattern.compile("(.*) replied on the change");
@@ -386,7 +394,7 @@
     RevCommit originalCommit;
 
     boolean rewriteStarted = false;
-    ChangeFixProgress changeFixProgress = new ChangeFixProgress();
+    ChangeFixProgress changeFixProgress = new ChangeFixProgress(ref.getName());
     while ((originalCommit = revWalk.next()) != null) {
 
       changeFixProgress.updateAuthorId =
@@ -535,10 +543,16 @@
     Matcher assigneeDeletedMatcher = ASSIGNEE_DELETED_PATTERN.matcher(originalChangeMessage);
     if (assigneeDeletedMatcher.matches()) {
       if (!NON_REPLACE_ACCOUNT_PATTERN.matcher(assigneeDeletedMatcher.group(1)).matches()) {
+        Optional<String> assigneeReplacement =
+            getPossibleAccountReplacement(
+                changeFixProgress,
+                oldAssignee,
+                getAccountInfoFromNameEmail(assigneeDeletedMatcher.group(1)));
+
         return Optional.of(
-            "Assignee deleted: "
-                + getPossibleAccountReplacement(
-                    changeFixProgress, oldAssignee, assigneeDeletedMatcher.group(1)));
+            assigneeReplacement.isPresent()
+                ? "Assignee deleted: " + assigneeReplacement.get()
+                : "Assignee was deleted.");
       }
       return Optional.empty();
     }
@@ -546,10 +560,15 @@
     Matcher assigneeAddedMatcher = ASSIGNEE_ADDED_PATTERN.matcher(originalChangeMessage);
     if (assigneeAddedMatcher.matches()) {
       if (!NON_REPLACE_ACCOUNT_PATTERN.matcher(assigneeAddedMatcher.group(1)).matches()) {
+        Optional<String> assigneeReplacement =
+            getPossibleAccountReplacement(
+                changeFixProgress,
+                newAssignee,
+                getAccountInfoFromNameEmail(assigneeAddedMatcher.group(1)));
         return Optional.of(
-            "Assignee added: "
-                + getPossibleAccountReplacement(
-                    changeFixProgress, newAssignee, assigneeAddedMatcher.group(1)));
+            assigneeReplacement.isPresent()
+                ? "Assignee added: " + assigneeReplacement.get()
+                : "Assignee was added.");
       }
       return Optional.empty();
     }
@@ -557,13 +576,22 @@
     Matcher assigneeChangedMatcher = ASSIGNEE_CHANGED_PATTERN.matcher(originalChangeMessage);
     if (assigneeChangedMatcher.matches()) {
       if (!NON_REPLACE_ACCOUNT_PATTERN.matcher(assigneeChangedMatcher.group(1)).matches()) {
+        Optional<String> oldAssigneeReplacement =
+            getPossibleAccountReplacement(
+                changeFixProgress,
+                oldAssignee,
+                getAccountInfoFromNameEmail(assigneeChangedMatcher.group(1)));
+        Optional<String> newAssigneeReplacement =
+            getPossibleAccountReplacement(
+                changeFixProgress,
+                newAssignee,
+                getAccountInfoFromNameEmail(assigneeChangedMatcher.group(2)));
         return Optional.of(
-            String.format(
-                "Assignee changed from: %s to: %s",
-                getPossibleAccountReplacement(
-                    changeFixProgress, oldAssignee, assigneeChangedMatcher.group(1)),
-                getPossibleAccountReplacement(
-                    changeFixProgress, newAssignee, assigneeChangedMatcher.group(2))));
+            oldAssigneeReplacement.isPresent() && newAssigneeReplacement.isPresent()
+                ? String.format(
+                    "Assignee changed from: %s to: %s",
+                    oldAssigneeReplacement.get(), newAssigneeReplacement.get())
+                : "Assignee was changed.");
       }
       return Optional.empty();
     }
@@ -576,7 +604,7 @@
     }
     Matcher matcher = REMOVED_REVIEWER_PATTERN.matcher(originalChangeMessage);
 
-    if (matcher.find() && !ACCOUNT_TEMPLATE_PATTERN.matcher(matcher.group(2)).matches()) {
+    if (matcher.matches() && !ACCOUNT_TEMPLATE_PATTERN.matcher(matcher.group(2)).matches()) {
       // Since we do not use change messages for reviewer updates on UI, it does not matter what we
       // rewrite it to.
       return Optional.of(originalChangeMessage.substring(0, matcher.end(1)));
@@ -594,12 +622,15 @@
 
     Matcher matcher = REMOVED_VOTE_PATTERN.matcher(originalChangeMessage);
     if (matcher.matches() && !NON_REPLACE_ACCOUNT_PATTERN.matcher(matcher.group(2)).matches()) {
-      return Optional.of(
-          String.format(
-              "Removed %s by %s",
-              matcher.group(1),
-              getPossibleAccountReplacement(
-                  changeFixProgress, reviewer, getNameFromNameEmail(matcher.group(2)))));
+      Optional<String> reviewerReplacement =
+          getPossibleAccountReplacement(
+              changeFixProgress, reviewer, getAccountInfoFromNameEmail(matcher.group(2)));
+      StringBuilder replacement = new StringBuilder();
+      replacement.append("Removed ").append(matcher.group(1));
+      if (reviewerReplacement.isPresent()) {
+        replacement.append(" by ").append(reviewerReplacement.get());
+      }
+      return Optional.of(replacement.toString());
     }
     return Optional.empty();
   }
@@ -612,21 +643,27 @@
     }
     String[] lines = originalChangeMessage.split("\\r?\\n");
     StringBuilder fixedLines = new StringBuilder();
+    boolean anyFixed = false;
     for (int i = 1; i < lines.length; i++) {
       if (lines[i].isEmpty()) {
         continue;
       }
       Matcher matcher = REMOVED_VOTES_CHANGE_MESSAGE_PATTERN.matcher(lines[i]);
+      String replacementLine = lines[i];
       if (matcher.matches() && !NON_REPLACE_ACCOUNT_PATTERN.matcher(matcher.group(2)).matches()) {
-        fixedLines.append(
-            String.format(
-                "* %s by %s\n",
-                matcher.group(1),
-                getPossibleAccountReplacement(
-                    changeFixProgress, Optional.empty(), getNameFromNameEmail(matcher.group(2)))));
+        anyFixed = true;
+        Optional<String> reviewerReplacement =
+            getPossibleAccountReplacement(
+                changeFixProgress, Optional.empty(), getAccountInfoFromNameEmail(matcher.group(2)));
+        replacementLine = "* " + matcher.group(1);
+        if (reviewerReplacement.isPresent()) {
+          replacementLine += " by " + reviewerReplacement.get();
+        }
+        replacementLine += "\n";
       }
+      fixedLines.append(replacementLine);
     }
-    if (fixedLines.length() == 0) {
+    if (!anyFixed) {
       return Optional.empty();
     }
     return Optional.of(REMOVED_VOTES_CHANGE_MESSAGE_START + "\n" + fixedLines);
@@ -686,10 +723,14 @@
     StringBuffer sb = new StringBuffer();
     while (onAddReviewerMatcher.find()) {
       String reviewerName = normalizeOnCodeOwnerAddReviewerMatch(onAddReviewerMatcher.group(1));
-      String replacementName =
-          getPossibleAccountReplacement(changeFixProgress, Optional.empty(), reviewerName);
+      Optional<String> replacementName =
+          getPossibleAccountReplacement(
+              changeFixProgress, Optional.empty(), ParsedAccountInfo.create(reviewerName));
       onAddReviewerMatcher.appendReplacement(
-          sb, replacementName + ", who was added as reviewer owns the following files");
+          sb,
+          replacementName.isPresent()
+              ? replacementName.get() + ", who was added as reviewer owns the following files"
+              : "Added reviewer owns the following files");
     }
     onAddReviewerMatcher.appendTail(sb);
     sb.append("\n");
@@ -717,7 +758,11 @@
     if (Strings.isNullOrEmpty(originalMessage)) {
       return Optional.empty();
     }
-
+    Matcher onCodeOwnerPostReviewMatcher =
+        ON_CODE_OWNER_POST_REVIEW_PATTERN.matcher(originalMessage);
+    if (!onCodeOwnerPostReviewMatcher.matches()) {
+      return Optional.empty();
+    }
     Matcher onCodeOwnerReviewMatcher = ON_CODE_OWNER_REVIEW_PATTERN.matcher(originalMessage);
     while (onCodeOwnerReviewMatcher.find()) {
       String accountName =
@@ -809,7 +854,9 @@
     for (FooterLine fl : footerLines) {
       String footerKey = fl.getKey();
       String footerValue = fl.getValue();
-      if (footerKey.equalsIgnoreCase(FOOTER_ASSIGNEE.getName())) {
+      if (footerKey.equalsIgnoreCase(FOOTER_TAG.getName())) {
+        fixProgress.tag = footerValue;
+      } else if (footerKey.equalsIgnoreCase(FOOTER_ASSIGNEE.getName())) {
         Account.Id oldAssignee = fixProgress.assigneeId;
         FixIdentResult fixedAssignee = null;
         if (footerValue.equals("")) {
@@ -940,7 +987,8 @@
       fixedChangeMessage =
           fixCodeOwnersOnReviewChangeMessage(fixProgress.updateAuthorId, originalChangeMessage);
     }
-    if (!fixedChangeMessage.isPresent()) {
+    if (!fixedChangeMessage.isPresent()
+        && Objects.equals(fixProgress.tag, CODE_OWNER_ADD_REVIEWER_TAG)) {
       fixedChangeMessage =
           fixCodeOwnersOnAddReviewerChangeMessage(fixProgress, originalChangeMessage);
     }
@@ -971,9 +1019,10 @@
   private Optional<Account.Id> parseIdent(ChangeFixProgress changeFixProgress, PersonIdent ident) {
     Optional<Account.Id> account = NoteDbUtil.parseIdent(ident);
     if (account.isPresent()) {
-      changeFixProgress.parsedAccounts.putIfAbsent(account.get(), "");
+      changeFixProgress.parsedAccounts.putIfAbsent(account.get(), Optional.empty());
     } else {
-      logger.atWarning().log("Failed to parse id %s", ident);
+      logger.atWarning().log(
+          "Fixing ref %s, failed to parse id %s", changeFixProgress.changeMetaRef, ident);
     }
     return account;
   }
@@ -1022,10 +1071,16 @@
     return fixIdentResult;
   }
 
-  /** Extracts {@link Account#getName} from {@link Account#getNameEmail} */
-  private String getNameFromNameEmail(String nameEmail) {
+  /** Extracts {@link ParsedAccountInfo} from {@link Account#getNameEmail} */
+  private ParsedAccountInfo getAccountInfoFromNameEmail(String nameEmail) {
     Matcher nameEmailMatcher = NAME_EMAIL_PATTERN.matcher(nameEmail);
-    return nameEmailMatcher.matches() ? nameEmailMatcher.group(1) : nameEmail;
+    if (!nameEmailMatcher.matches()) {
+      return ParsedAccountInfo.create(nameEmail);
+    }
+
+    return ParsedAccountInfo.create(
+        nameEmailMatcher.group(1),
+        nameEmailMatcher.group(2).substring(1, nameEmailMatcher.group(2).length() - 1));
   }
 
   /**
@@ -1034,43 +1089,79 @@
    * <p>If {@code account} is known, replace with {@link AccountTemplateUtil#getAccountTemplate}.
    * Otherwise, try to guess the correct replacement account for {@code accountName} among {@link
    * ChangeFixProgress#parsedAccounts} that appeared in the change. If this fails {@link
-   * #DEFAULT_ACCOUNT_REPLACEMENT} is applied.
+   * Optional#empty} is returned.
    *
    * @param changeFixProgress see {@link ChangeFixProgress}
    * @param account account that should be used for replacement, if known
-   * @param accountName {@link Account#getName} to replace.
-   * @return replacement for {@code accountName}
+   * @param accountInfo {@link ParsedAccountInfo} to replace.
+   * @return replacement for {@code accountName} or {@link Optional#empty}, if the replacement could
+   *     not be determined.
    */
-  private String getPossibleAccountReplacement(
-      ChangeFixProgress changeFixProgress, Optional<Account.Id> account, String accountName) {
+  private Optional<String> getPossibleAccountReplacement(
+      ChangeFixProgress changeFixProgress,
+      Optional<Account.Id> account,
+      ParsedAccountInfo accountInfo) {
     if (account.isPresent()) {
-      return AccountTemplateUtil.getAccountTemplate(account.get());
+      return Optional.of(AccountTemplateUtil.getAccountTemplate(account.get()));
     }
     // Retrieve reviewer accounts from cache and try to match by their name.
-    Map<Account.Id, AccountState> missingUserNameReviewers =
+    Map<Account.Id, AccountState> missingAccountStateReviewers =
         accountCache.get(
             changeFixProgress.parsedAccounts.entrySet().stream()
-                .filter(entry -> entry.getValue().isEmpty())
+                .filter(entry -> !entry.getValue().isPresent())
                 .map(Map.Entry::getKey)
                 .collect(ImmutableSet.toImmutableSet()));
     changeFixProgress.parsedAccounts.putAll(
-        missingUserNameReviewers.entrySet().stream()
+        missingAccountStateReviewers.entrySet().stream()
             .collect(
                 ImmutableMap.toImmutableMap(
-                    Map.Entry::getKey, e -> e.getValue().account().getName())));
-    Set<Account.Id> possibleReplacements =
-        changeFixProgress.parsedAccounts.entrySet().stream()
-            .filter(e -> e.getValue().equals(accountName))
-            .map(Entry::getKey)
-            .collect(ImmutableSet.toImmutableSet());
-    String replacementName = DEFAULT_ACCOUNT_REPLACEMENT;
+                    Map.Entry::getKey, e -> Optional.ofNullable(e.getValue()))));
+    Map<Account.Id, AccountState> possibleReplacements = ImmutableMap.of();
+    if (accountInfo.email().isPresent()) {
+      possibleReplacements =
+          changeFixProgress.parsedAccounts.entrySet().stream()
+              .filter(
+                  e ->
+                      e.getValue().isPresent()
+                          && Objects.equals(
+                              e.getValue().get().account().preferredEmail(),
+                              accountInfo.email().get()))
+              .collect(ImmutableMap.toImmutableMap(Map.Entry::getKey, e -> e.getValue().get()));
+      // Filter further so we match both email & name
+      if (possibleReplacements.size() > 1) {
+        logger.atWarning().log(
+            "Fixing ref %s, multiple accounts found with the same email address, while replacing %s",
+            changeFixProgress.changeMetaRef, accountInfo);
+        possibleReplacements =
+            possibleReplacements.entrySet().stream()
+                .filter(e -> Objects.equals(e.getValue().account().getName(), accountInfo.name()))
+                .collect(ImmutableMap.toImmutableMap(Map.Entry::getKey, Map.Entry::getValue));
+      }
+    }
     if (possibleReplacements.isEmpty()) {
-      logger.atWarning().log("Could not find reviewer account matching name %s", accountName);
+      possibleReplacements =
+          changeFixProgress.parsedAccounts.entrySet().stream()
+              .filter(
+                  e ->
+                      e.getValue().isPresent()
+                          && Objects.equals(
+                              e.getValue().get().account().getName(), accountInfo.name()))
+              .collect(ImmutableMap.toImmutableMap(Map.Entry::getKey, e -> e.getValue().get()));
+    }
+    Optional<String> replacementName = Optional.empty();
+    if (possibleReplacements.isEmpty()) {
+      logger.atWarning().log(
+          "Fixing ref %s, could not find reviewer account matching name %s",
+          changeFixProgress.changeMetaRef, accountInfo);
     } else if (possibleReplacements.size() > 1) {
-      logger.atWarning().log("Found multiple reviewer account matching name %s", accountName);
+      logger.atWarning().log(
+          "Fixing ref %s found multiple reviewer account matching name %s",
+          changeFixProgress.changeMetaRef, accountInfo);
     } else {
       replacementName =
-          AccountTemplateUtil.getAccountTemplate(Iterables.getOnlyElement(possibleReplacements));
+          Optional.of(
+              AccountTemplateUtil.getAccountTemplate(
+                  Iterables.getOnlyElement(possibleReplacements.keySet())));
     }
     return replacementName;
   }
@@ -1135,6 +1226,13 @@
    * recent update.
    */
   private static class ChangeFixProgress {
+
+    /** {@link RefNames#changeMetaRef} of the change that is being fixed. */
+    final String changeMetaRef;
+
+    /** Tag at current commit update. */
+    String tag = null;
+
     /** Assignee at current commit update. */
     Account.Id assigneeId = null;
 
@@ -1146,7 +1244,7 @@
      * #accountCache} if needed by rewrite. Maps to empty string if was not requested from cache
      * yet.
      */
-    Map<Account.Id, String> parsedAccounts = new HashMap<>();
+    Map<Account.Id, Optional<AccountState>> parsedAccounts = new HashMap<>();
 
     /** Id of the current commit in rewriter walk. */
     ObjectId newTipId = null;
@@ -1160,5 +1258,29 @@
     boolean isValidAfterFix = true;
 
     List<CommitDiff> commitDiffs = new ArrayList<>();
+
+    public ChangeFixProgress(String changeMetaRef) {
+      this.changeMetaRef = changeMetaRef;
+    }
+  }
+
+  /**
+   * Account info parsed from {@link Account#getNameEmail}. See {@link
+   * #getAccountInfoFromNameEmail}.
+   */
+  @AutoValue
+  abstract static class ParsedAccountInfo {
+
+    static ParsedAccountInfo create(String fullName, String email) {
+      return new AutoValue_CommitRewriter_ParsedAccountInfo(fullName, Optional.ofNullable(email));
+    }
+
+    static ParsedAccountInfo create(String fullName) {
+      return new AutoValue_CommitRewriter_ParsedAccountInfo(fullName, Optional.empty());
+    }
+
+    abstract String name();
+
+    abstract Optional<String> email();
   }
 }
diff --git a/java/com/google/gerrit/server/notedb/StoreSubmitRequirementsOp.java b/java/com/google/gerrit/server/notedb/StoreSubmitRequirementsOp.java
index 57a3cd7..1a7d5af 100644
--- a/java/com/google/gerrit/server/notedb/StoreSubmitRequirementsOp.java
+++ b/java/com/google/gerrit/server/notedb/StoreSubmitRequirementsOp.java
@@ -50,7 +50,9 @@
     // patchset to the user before it was merged.
     ChangeData changeData = changeDataFactory.create(ctx.getProject(), ctx.getChange().getId());
     ChangeUpdate update = ctx.getUpdate(ctx.getChange().currentPatchSetId());
-    update.putSubmitRequirementResults(evaluator.evaluateAllRequirements(changeData).values());
+    // We do not want to store submit requirements in NoteDb for legacy submit records
+    update.putSubmitRequirementResults(
+        evaluator.evaluateAllRequirements(changeData, /* includeLegacy= */ false).values());
     return !changeData.submitRequirements().isEmpty();
   }
 }
diff --git a/java/com/google/gerrit/server/patch/DiffExecutor.java b/java/com/google/gerrit/server/patch/DiffExecutor.java
index 63d5c50..c9b87ff 100644
--- a/java/com/google/gerrit/server/patch/DiffExecutor.java
+++ b/java/com/google/gerrit/server/patch/DiffExecutor.java
@@ -16,14 +16,11 @@
 
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
-import com.google.gerrit.server.patch.filediff.PatchListLoader;
 import com.google.inject.BindingAnnotation;
 import java.lang.annotation.Retention;
 import java.util.concurrent.ExecutorService;
 
-/**
- * Marker on {@link ExecutorService} used by {@link IntraLineLoader} and {@link PatchListLoader}.
- */
+/** Marker on {@link ExecutorService} used by {@link IntraLineLoader}. */
 @Retention(RUNTIME)
 @BindingAnnotation
 public @interface DiffExecutor {}
diff --git a/java/com/google/gerrit/server/patch/PatchListCache.java b/java/com/google/gerrit/server/patch/PatchListCache.java
index 6d42249..b8651e0 100644
--- a/java/com/google/gerrit/server/patch/PatchListCache.java
+++ b/java/com/google/gerrit/server/patch/PatchListCache.java
@@ -16,18 +16,11 @@
 
 import com.google.gerrit.entities.Project;
 
-/** Provides a cached list of {@link PatchListEntry}. */
+/**
+ * Provides a cached list of intra-line and summary diffs. Use {@link DiffOperations} to compute
+ * detailed file diffs.
+ */
 public interface PatchListCache {
-  /**
-   * Returns the patch list - list of modified files - between two commits.
-   *
-   * @param key identifies the old / new commits.
-   * @param project name key identifying a specific git project (repository).
-   * @return patch list containing the modified files between two commits.
-   * @deprecated use {@link DiffOperations} instead.
-   */
-  @Deprecated
-  PatchList get(PatchListKey key, Project.NameKey project) throws PatchListNotAvailableException;
 
   IntraLineDiff getIntraLineDiff(IntraLineDiffKey key, IntraLineDiffArgs args);
 
diff --git a/java/com/google/gerrit/server/patch/PatchListCacheImpl.java b/java/com/google/gerrit/server/patch/PatchListCacheImpl.java
index dd2bb47..eab0c22 100644
--- a/java/com/google/gerrit/server/patch/PatchListCacheImpl.java
+++ b/java/com/google/gerrit/server/patch/PatchListCacheImpl.java
@@ -15,14 +15,12 @@
 
 package com.google.gerrit.server.patch;
 
-import com.google.common.annotations.VisibleForTesting;
 import com.google.common.cache.Cache;
+import com.google.common.flogger.FluentLogger;
 import com.google.common.util.concurrent.UncheckedExecutionException;
 import com.google.gerrit.entities.Project;
-import com.google.gerrit.server.cache.CacheBackend;
 import com.google.gerrit.server.cache.CacheModule;
 import com.google.gerrit.server.config.GerritServerConfig;
-import com.google.gerrit.server.patch.filediff.PatchListLoader;
 import com.google.inject.Inject;
 import com.google.inject.Module;
 import com.google.inject.Singleton;
@@ -30,12 +28,12 @@
 import java.util.concurrent.ExecutionException;
 import org.eclipse.jgit.errors.LargeObjectException;
 import org.eclipse.jgit.lib.Config;
-import org.eclipse.jgit.lib.ObjectId;
 
 /** Provides a cached list of {@link PatchListEntry}. */
 @Singleton
 public class PatchListCacheImpl implements PatchListCache {
-  public static final String FILE_NAME = "diff";
+  public static final FluentLogger logger = FluentLogger.forEnclosingClass();
+
   static final String INTRA_NAME = "diff_intraline";
   static final String DIFF_SUMMARY = "diff_summary";
 
@@ -43,13 +41,6 @@
     return new CacheModule() {
       @Override
       protected void configure() {
-        factory(PatchListLoader.Factory.class);
-        // TODO(davido): Switch off using legacy cache backend, after fixing PatchListLoader
-        // to be recursion free.
-        persist(FILE_NAME, PatchListKey.class, PatchList.class, CacheBackend.GUAVA)
-            .maximumWeight(10 << 20)
-            .weigher(PatchListWeigher.class);
-
         factory(IntraLineLoader.Factory.class);
         persist(INTRA_NAME, IntraLineDiffKey.class, IntraLineDiff.class)
             .maximumWeight(10 << 20)
@@ -67,27 +58,21 @@
     };
   }
 
-  private final Cache<PatchListKey, PatchList> fileCache;
   private final Cache<IntraLineDiffKey, IntraLineDiff> intraCache;
   private final Cache<DiffSummaryKey, DiffSummary> diffSummaryCache;
-  private final PatchListLoader.Factory fileLoaderFactory;
   private final IntraLineLoader.Factory intraLoaderFactory;
   private final DiffSummaryLoader.Factory diffSummaryLoaderFactory;
   private final boolean computeIntraline;
 
   @Inject
   PatchListCacheImpl(
-      @Named(FILE_NAME) Cache<PatchListKey, PatchList> fileCache,
       @Named(INTRA_NAME) Cache<IntraLineDiffKey, IntraLineDiff> intraCache,
       @Named(DIFF_SUMMARY) Cache<DiffSummaryKey, DiffSummary> diffSummaryCache,
-      PatchListLoader.Factory fileLoaderFactory,
       IntraLineLoader.Factory intraLoaderFactory,
       DiffSummaryLoader.Factory diffSummaryLoaderFactory,
       @GerritServerConfig Config cfg) {
-    this.fileCache = fileCache;
     this.intraCache = intraCache;
     this.diffSummaryCache = diffSummaryCache;
-    this.fileLoaderFactory = fileLoaderFactory;
     this.intraLoaderFactory = intraLoaderFactory;
     this.diffSummaryLoaderFactory = diffSummaryLoaderFactory;
 
@@ -97,31 +82,6 @@
   }
 
   @Override
-  public PatchList get(PatchListKey key, Project.NameKey project)
-      throws PatchListNotAvailableException {
-    try {
-      PatchList pl = fileCache.get(key, fileLoaderFactory.create(key, project));
-      if (pl instanceof LargeObjectTombstone) {
-        throw new PatchListObjectTooLargeException(
-            "Error computing " + key + ". Previous attempt failed with LargeObjectException");
-      }
-      return pl;
-    } catch (ExecutionException e) {
-      PatchListLoader.logger.atWarning().withCause(e).log("Error computing %s", key);
-      throw new PatchListNotAvailableException(e);
-    } catch (UncheckedExecutionException e) {
-      if (e.getCause() instanceof LargeObjectException) {
-        // Cache negative result so we don't need to redo expensive computations that would yield
-        // the same result.
-        fileCache.put(key, new LargeObjectTombstone());
-        PatchListLoader.logger.atWarning().withCause(e).log("Error computing %s", key);
-        throw new PatchListNotAvailableException(e);
-      }
-      throw e;
-    }
-  }
-
-  @Override
   public IntraLineDiff getIntraLineDiff(IntraLineDiffKey key, IntraLineDiffArgs args) {
     if (computeIntraline) {
       try {
@@ -140,28 +100,14 @@
     try {
       return diffSummaryCache.get(key, diffSummaryLoaderFactory.create(key, project));
     } catch (ExecutionException e) {
-      PatchListLoader.logger.atWarning().withCause(e).log("Error computing %s", key);
+      logger.atWarning().withCause(e).log("Error computing %s", key);
       throw new PatchListNotAvailableException(e);
     } catch (UncheckedExecutionException e) {
       if (e.getCause() instanceof LargeObjectException) {
-        PatchListLoader.logger.atWarning().withCause(e).log("Error computing %s", key);
+        logger.atWarning().withCause(e).log("Error computing %s", key);
         throw new PatchListNotAvailableException(e);
       }
       throw e;
     }
   }
-
-  /** Used to cache negative results in {@code fileCache}. */
-  @VisibleForTesting
-  public static class LargeObjectTombstone extends PatchList {
-    private static final long serialVersionUID = 1L;
-
-    @VisibleForTesting
-    public LargeObjectTombstone() {
-      // Initialize super class with valid values. We don't care about the inner state, but need to
-      // pass valid values that don't break (de)serialization.
-      super(
-          null, ObjectId.zeroId(), false, ComparisonType.againstAutoMerge(), new PatchListEntry[0]);
-    }
-  }
 }
diff --git a/java/com/google/gerrit/server/patch/PatchListWeigher.java b/java/com/google/gerrit/server/patch/PatchListWeigher.java
deleted file mode 100644
index 942d0e0..0000000
--- a/java/com/google/gerrit/server/patch/PatchListWeigher.java
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright (C) 2012 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.server.patch;
-
-import com.google.common.cache.Weigher;
-
-/** Approximates memory usage for PatchList in bytes of memory used. */
-public class PatchListWeigher implements Weigher<PatchListKey, PatchList> {
-  @Override
-  public int weigh(PatchListKey key, PatchList value) {
-    int size =
-        16
-            + 4 * 8
-            + 2 * 36
-            + 8 // Size of PatchListKey, 64 bit JVM
-            + 16
-            + 3 * 8
-            + 3 * 4
-            + 20; // Size of PatchList, 64 bit JVM
-    for (PatchListEntry e : value.getPatches()) {
-      size += e.weigh();
-    }
-    return size;
-  }
-}
diff --git a/java/com/google/gerrit/server/patch/PatchScriptBuilder.java b/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
index 0b08c4f..33300e3 100644
--- a/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
+++ b/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
@@ -71,28 +71,8 @@
     intralineDiffCalculator = calculator;
   }
 
-  /** Convert into {@link PatchScript} using the old diff cache output. */
-  PatchScript toPatchScriptOld(Repository git, PatchList list, PatchListEntry content)
-      throws IOException {
-
-    PatchFileChange change =
-        new PatchFileChange(
-            content.getEdits(),
-            content.getEditsDueToRebase(),
-            content.getHeaderLines(),
-            content.getOldName(),
-            content.getNewName(),
-            content.getChangeType(),
-            content.getPatchType());
-    SidesResolver sidesResolver = new SidesResolver(git, list.getComparisonType());
-    ResolvedSides sides =
-        resolveSides(
-            git, sidesResolver, oldName(change), newName(change), list.getOldId(), list.getNewId());
-    return build(sides.a, sides.b, change);
-  }
-
   /** Convert into {@link PatchScript} using the new diff cache output. */
-  PatchScript toPatchScriptNew(Repository git, FileDiffOutput content) throws IOException {
+  PatchScript toPatchScript(Repository git, FileDiffOutput content) throws IOException {
     PatchFileChange change =
         new PatchFileChange(
             content.edits().stream().map(TaggedEdit::jgitEdit).collect(toImmutableList()),
diff --git a/java/com/google/gerrit/server/patch/PatchScriptFactory.java b/java/com/google/gerrit/server/patch/PatchScriptFactory.java
index 96b23c8..02f125a 100644
--- a/java/com/google/gerrit/server/patch/PatchScriptFactory.java
+++ b/java/com/google/gerrit/server/patch/PatchScriptFactory.java
@@ -229,7 +229,7 @@
                 notes.getProjectName(), bId, parentNum, fileName, diffPrefs.ignoreWhitespace)
             : diffOperations.getModifiedFile(
                 notes.getProjectName(), aId, bId, fileName, diffPrefs.ignoreWhitespace);
-    return newBuilder().toPatchScriptNew(git, fileDiffOutput);
+    return newBuilder().toPatchScript(git, fileDiffOutput);
   }
 
   private Optional<ObjectId> getAId() {
diff --git a/java/com/google/gerrit/server/patch/filediff/PatchListLoader.java b/java/com/google/gerrit/server/patch/filediff/PatchListLoader.java
deleted file mode 100644
index 031f3db..0000000
--- a/java/com/google/gerrit/server/patch/filediff/PatchListLoader.java
+++ /dev/null
@@ -1,705 +0,0 @@
-//  Copyright (C) 2020 The Android Open Source Project
-//
-//  Licensed under the Apache License, Version 2.0 (the "License");
-//  you may not use this file except in compliance with the License.
-//  You may obtain a copy of the License at
-//
-//  http://www.apache.org/licenses/LICENSE-2.0
-//
-//  Unless required by applicable law or agreed to in writing, software
-//  distributed under the License is distributed on an "AS IS" BASIS,
-//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//  See the License for the specific language governing permissions and
-//  limitations under the License.
-//
-//
-//
-
-package com.google.gerrit.server.patch.filediff;
-
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.collect.ImmutableList.toImmutableList;
-import static java.nio.charset.StandardCharsets.UTF_8;
-import static java.util.stream.Collectors.toSet;
-import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
-
-import com.google.auto.value.AutoValue;
-import com.google.common.base.Throwables;
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMultimap;
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Iterables;
-import com.google.common.collect.Multimap;
-import com.google.common.flogger.FluentLogger;
-import com.google.gerrit.entities.Patch;
-import com.google.gerrit.entities.Project;
-import com.google.gerrit.exceptions.StorageException;
-import com.google.gerrit.extensions.client.DiffPreferencesInfo.Whitespace;
-import com.google.gerrit.metrics.Counter0;
-import com.google.gerrit.metrics.Description;
-import com.google.gerrit.metrics.MetricMaker;
-import com.google.gerrit.server.config.ConfigUtil;
-import com.google.gerrit.server.config.GerritServerConfig;
-import com.google.gerrit.server.git.GitRepositoryManager;
-import com.google.gerrit.server.git.InMemoryInserter;
-import com.google.gerrit.server.git.MergeUtil;
-import com.google.gerrit.server.patch.AutoMerger;
-import com.google.gerrit.server.patch.ComparisonType;
-import com.google.gerrit.server.patch.DiffExecutor;
-import com.google.gerrit.server.patch.PatchList;
-import com.google.gerrit.server.patch.PatchListCache;
-import com.google.gerrit.server.patch.PatchListCacheImpl;
-import com.google.gerrit.server.patch.PatchListEntry;
-import com.google.gerrit.server.patch.PatchListKey;
-import com.google.gerrit.server.patch.PatchListNotAvailableException;
-import com.google.gerrit.server.patch.Text;
-import com.google.gerrit.server.patch.filediff.EditTransformer.ContextAwareEdit;
-import com.google.inject.Inject;
-import com.google.inject.Singleton;
-import com.google.inject.assistedinject.Assisted;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
-import org.eclipse.jgit.diff.DiffEntry;
-import org.eclipse.jgit.diff.DiffEntry.ChangeType;
-import org.eclipse.jgit.diff.DiffFormatter;
-import org.eclipse.jgit.diff.Edit;
-import org.eclipse.jgit.diff.EditList;
-import org.eclipse.jgit.diff.HistogramDiff;
-import org.eclipse.jgit.diff.RawText;
-import org.eclipse.jgit.diff.RawTextComparator;
-import org.eclipse.jgit.lib.AbbreviatedObjectId;
-import org.eclipse.jgit.lib.Config;
-import org.eclipse.jgit.lib.Constants;
-import org.eclipse.jgit.lib.FileMode;
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.ObjectInserter;
-import org.eclipse.jgit.lib.ObjectReader;
-import org.eclipse.jgit.lib.Repository;
-import org.eclipse.jgit.merge.ThreeWayMergeStrategy;
-import org.eclipse.jgit.patch.FileHeader;
-import org.eclipse.jgit.patch.FileHeader.PatchType;
-import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.revwalk.RevObject;
-import org.eclipse.jgit.revwalk.RevTree;
-import org.eclipse.jgit.revwalk.RevWalk;
-import org.eclipse.jgit.treewalk.TreeWalk;
-import org.eclipse.jgit.util.io.DisabledOutputStream;
-
-public class PatchListLoader implements Callable<PatchList> {
-  public static final FluentLogger logger = FluentLogger.forEnclosingClass();
-
-  public interface Factory {
-    PatchListLoader create(PatchListKey key, Project.NameKey project);
-  }
-
-  @Singleton
-  static class Metrics {
-    final Counter0 timeouts;
-
-    @Inject
-    Metrics(MetricMaker metricMaker) {
-      // TODO(ghareeb): Remove this metric from documentation once this class is deprecated.
-      timeouts =
-          metricMaker.newCounter(
-              "caches/diff/legacy/timeouts",
-              new Description(
-                      "Total number of git file diff computations that resulted in timeouts.")
-                  .setRate()
-                  .setUnit("count"));
-    }
-  }
-
-  private final GitRepositoryManager repoManager;
-  private final PatchListCache patchListCache;
-  private final ThreeWayMergeStrategy mergeStrategy;
-  private final ExecutorService diffExecutor;
-  private final AutoMerger autoMerger;
-  private final PatchListKey key;
-  private final Metrics metrics;
-  private final Project.NameKey project;
-  private final long timeoutMillis;
-
-  @Inject
-  PatchListLoader(
-      GitRepositoryManager mgr,
-      PatchListCache plc,
-      @GerritServerConfig Config cfg,
-      @DiffExecutor ExecutorService de,
-      AutoMerger am,
-      Metrics metrics,
-      @Assisted PatchListKey k,
-      @Assisted Project.NameKey p) {
-    this.repoManager = mgr;
-    this.patchListCache = plc;
-    this.mergeStrategy = MergeUtil.getMergeStrategy(cfg);
-    this.diffExecutor = de;
-    this.autoMerger = am;
-    this.metrics = metrics;
-    this.key = k;
-    this.project = p;
-    this.timeoutMillis =
-        ConfigUtil.getTimeUnit(
-            cfg,
-            "cache",
-            PatchListCacheImpl.FILE_NAME,
-            "timeout",
-            TimeUnit.MILLISECONDS.convert(5, TimeUnit.SECONDS),
-            TimeUnit.MILLISECONDS);
-  }
-
-  @Override
-  public PatchList call() throws IOException, PatchListNotAvailableException {
-    try (Repository repo = repoManager.openRepository(project);
-        InMemoryInserter ins = new InMemoryInserter(repo);
-        ObjectReader reader = ins.newReader();
-        RevWalk rw = new RevWalk(reader)) {
-      return readPatchList(repo, rw, ins);
-    }
-  }
-
-  private static RawTextComparator comparatorFor(Whitespace ws) {
-    switch (ws) {
-      case IGNORE_ALL:
-        return RawTextComparator.WS_IGNORE_ALL;
-
-      case IGNORE_TRAILING:
-        return RawTextComparator.WS_IGNORE_TRAILING;
-
-      case IGNORE_LEADING_AND_TRAILING:
-        return RawTextComparator.WS_IGNORE_CHANGE;
-
-      case IGNORE_NONE:
-      default:
-        return RawTextComparator.DEFAULT;
-    }
-  }
-
-  private PatchList readPatchList(Repository repo, RevWalk rw, InMemoryInserter ins)
-      throws IOException, PatchListNotAvailableException {
-    ObjectReader reader = rw.getObjectReader();
-    checkArgument(reader.getCreatedFromInserter() == ins);
-    RawTextComparator cmp = comparatorFor(key.getWhitespace());
-    try (DiffFormatter df = new DiffFormatter(DisabledOutputStream.INSTANCE)) {
-      RevCommit b = rw.parseCommit(key.getNewId());
-      RevObject a = aFor(key, repo, rw, ins, b);
-
-      if (a == null) {
-        // TODO(sop) Remove this case.
-        // This is an octopus merge commit which should be compared against the
-        // auto-merge. However since we don't support computing the auto-merge
-        // for octopus merge commits, we fall back to diffing against the first
-        // parent, even though this wasn't what was requested.
-        //
-        ComparisonType comparisonType = ComparisonType.againstParent(1);
-        PatchListEntry[] entries = new PatchListEntry[2];
-        entries[0] = newCommitMessage(cmp, reader, null, b);
-        entries[1] = newMergeList(cmp, reader, null, b, comparisonType);
-        return new PatchList(a, b, true, comparisonType, entries);
-      }
-
-      ComparisonType comparisonType = getComparisonType(a, b);
-
-      RevCommit aCommit = a instanceof RevCommit ? (RevCommit) a : null;
-      RevTree aTree = rw.parseTree(a);
-      RevTree bTree = b.getTree();
-
-      df.setReader(reader, repo.getConfig());
-      df.setDiffComparator(cmp);
-      df.setDetectRenames(true);
-      List<DiffEntry> diffEntries = df.scan(aTree, bTree);
-
-      EditsDueToRebaseResult editsDueToRebaseResult =
-          determineEditsDueToRebase(aCommit, b, diffEntries, df, rw);
-      diffEntries = editsDueToRebaseResult.getRelevantOriginalDiffEntries();
-      Multimap<String, ContextAwareEdit> editsDueToRebasePerFilePath =
-          editsDueToRebaseResult.getEditsDueToRebasePerFilePath();
-
-      List<PatchListEntry> entries = new ArrayList<>();
-      entries.add(
-          newCommitMessage(
-              cmp, reader, comparisonType.isAgainstParentOrAutoMerge() ? null : aCommit, b));
-      boolean isMerge = b.getParentCount() > 1;
-      if (isMerge) {
-        entries.add(
-            newMergeList(
-                cmp,
-                reader,
-                comparisonType.isAgainstParentOrAutoMerge() ? null : aCommit,
-                b,
-                comparisonType));
-      }
-      for (DiffEntry diffEntry : diffEntries) {
-        Set<ContextAwareEdit> editsDueToRebase =
-            getEditsDueToRebase(editsDueToRebasePerFilePath, diffEntry);
-        Optional<PatchListEntry> patchListEntry =
-            getPatchListEntry(reader, df, diffEntry, aTree, bTree, editsDueToRebase);
-        patchListEntry.ifPresent(entries::add);
-      }
-      return new PatchList(
-          a, b, isMerge, comparisonType, entries.toArray(new PatchListEntry[entries.size()]));
-    }
-  }
-
-  /**
-   * Identifies the edits which are present between {@code commitA} and {@code commitB} due to other
-   * commits in between those two. Edits which cannot be clearly attributed to those other commits
-   * (because they overlap with modifications introduced by {@code commitA} or {@code commitB}) are
-   * omitted from the result. The edits are expressed as differences between {@code treeA} of {@code
-   * commitA} and {@code treeB} of {@code commitB}.
-   *
-   * <p><b>Note:</b> If one of the commits is a merge commit, an empty {@code Multimap} will be
-   * returned.
-   *
-   * <p><b>Warning:</b> This method assumes that commitA and commitB are either a parent and child
-   * commit or represent two patch sets which belong to the same change. No checks are made to
-   * confirm this assumption! Passing arbitrary commits to this method may lead to strange results
-   * or take very long.
-   *
-   * <p>This logic could be expanded to arbitrary commits if the following adjustments were applied:
-   *
-   * <ul>
-   *   <li>If {@code commitA} is an ancestor of {@code commitB} (or the other way around), {@code
-   *       commitA} (or {@code commitB}) is used instead of its parent in this method.
-   *   <li>Special handling for merge commits is added. If only one of them is a merge commit, the
-   *       whole computation has to be done between the single parent and all parents of the merge
-   *       commit. If both of them are merge commits, all combinations of parents have to be
-   *       considered. Alternatively, we could decide to not support this feature for merge commits
-   *       (or just for specific types of merge commits).
-   * </ul>
-   *
-   * @param commitA the commit defining {@code treeA}
-   * @param commitB the commit defining {@code treeB}
-   * @param diffEntries the list of {@code DiffEntries} for the diff between {@code commitA} and
-   *     {@code commitB}
-   * @param df the {@code DiffFormatter}
-   * @param rw the current {@code RevWalk}
-   * @return an aggregated result of the computation
-   * @throws PatchListNotAvailableException if the edits can't be identified
-   * @throws IOException if an error occurred while accessing the repository
-   */
-  private EditsDueToRebaseResult determineEditsDueToRebase(
-      RevCommit commitA,
-      RevCommit commitB,
-      List<DiffEntry> diffEntries,
-      DiffFormatter df,
-      RevWalk rw)
-      throws PatchListNotAvailableException, IOException {
-    if (commitA == null
-        || isRootOrMergeCommit(commitA)
-        || isRootOrMergeCommit(commitB)
-        || areParentChild(commitA, commitB)
-        || haveCommonParent(commitA, commitB)) {
-      return EditsDueToRebaseResult.create(diffEntries, ImmutableMultimap.of());
-    }
-
-    PatchListKey oldKey = PatchListKey.againstDefaultBase(key.getOldId(), key.getWhitespace());
-    PatchList oldPatchList = patchListCache.get(oldKey, project);
-    PatchListKey newKey = PatchListKey.againstDefaultBase(key.getNewId(), key.getWhitespace());
-    PatchList newPatchList = patchListCache.get(newKey, project);
-
-    List<PatchListEntry> oldPatches = oldPatchList.getPatches();
-    List<PatchListEntry> newPatches = newPatchList.getPatches();
-    // TODO(aliceks): Have separate but more limited lists for parents and patch sets (but don't
-    // mess up renames/copies).
-    Set<String> touchedFilePaths = new HashSet<>();
-    for (PatchListEntry patchListEntry : oldPatches) {
-      touchedFilePaths.addAll(getTouchedFilePaths(patchListEntry));
-    }
-    for (PatchListEntry patchListEntry : newPatches) {
-      touchedFilePaths.addAll(getTouchedFilePaths(patchListEntry));
-    }
-
-    List<DiffEntry> relevantDiffEntries =
-        diffEntries.stream()
-            .filter(diffEntry -> isTouched(touchedFilePaths, diffEntry))
-            .collect(toImmutableList());
-
-    RevCommit parentCommitA = commitA.getParent(0);
-    rw.parseBody(parentCommitA);
-    RevCommit parentCommitB = commitB.getParent(0);
-    rw.parseBody(parentCommitB);
-    List<DiffEntry> parentDiffEntries = df.scan(parentCommitA, parentCommitB);
-    // TODO(aliceks): Find a way to not construct a PatchListEntry as it contains many unnecessary
-    // details and we don't fill all of them properly.
-    List<PatchListEntry> parentPatchListEntries =
-        getRelevantPatchListEntries(
-            parentDiffEntries, parentCommitA, parentCommitB, touchedFilePaths, df);
-
-    EditTransformer editTransformer = new EditTransformer(toFileEditsList(parentPatchListEntries));
-    editTransformer.transformReferencesOfSideA(toFileEditsList(oldPatches));
-    editTransformer.transformReferencesOfSideB(toFileEditsList(newPatches));
-    return EditsDueToRebaseResult.create(
-        relevantDiffEntries, editTransformer.getEditsPerFilePath());
-  }
-
-  private ImmutableList<FileEdits> toFileEditsList(List<PatchListEntry> entries) {
-    return entries.stream().map(PatchListLoader::toFileEdits).collect(toImmutableList());
-  }
-
-  private static FileEdits toFileEdits(PatchListEntry patchListEntry) {
-    Optional<String> oldName = Optional.empty();
-    Optional<String> newName = Optional.empty();
-    switch (patchListEntry.getChangeType()) {
-      case DELETED:
-        oldName = Optional.of(patchListEntry.getNewName());
-        break;
-      case ADDED:
-      case MODIFIED:
-      case REWRITE:
-        newName = Optional.of(patchListEntry.getNewName());
-        break;
-
-      case COPIED:
-      case RENAMED:
-        oldName = Optional.of(patchListEntry.getOldName());
-        newName = Optional.of(patchListEntry.getNewName());
-        break;
-    }
-    return FileEdits.createFromJgitEdits(patchListEntry.getEdits(), oldName, newName);
-  }
-
-  private static boolean isRootOrMergeCommit(RevCommit commit) {
-    return commit.getParentCount() != 1;
-  }
-
-  private static boolean areParentChild(RevCommit commitA, RevCommit commitB) {
-    return ObjectId.isEqual(commitA.getParent(0), commitB)
-        || ObjectId.isEqual(commitB.getParent(0), commitA);
-  }
-
-  private static boolean haveCommonParent(RevCommit commitA, RevCommit commitB) {
-    return ObjectId.isEqual(commitA.getParent(0), commitB.getParent(0));
-  }
-
-  private static Set<String> getTouchedFilePaths(PatchListEntry patchListEntry) {
-    String oldFilePath = patchListEntry.getOldName();
-    String newFilePath = patchListEntry.getNewName();
-
-    return oldFilePath == null
-        ? ImmutableSet.of(newFilePath)
-        : ImmutableSet.of(oldFilePath, newFilePath);
-  }
-
-  private static boolean isTouched(Set<String> touchedFilePaths, DiffEntry diffEntry) {
-    String oldFilePath = diffEntry.getOldPath();
-    String newFilePath = diffEntry.getNewPath();
-    // One of the above file paths could be /dev/null but we need not explicitly check for this
-    // value as the set of file paths shouldn't contain it.
-    return touchedFilePaths.contains(oldFilePath) || touchedFilePaths.contains(newFilePath);
-  }
-
-  private List<PatchListEntry> getRelevantPatchListEntries(
-      List<DiffEntry> parentDiffEntries,
-      RevCommit parentCommitA,
-      RevCommit parentCommitB,
-      Set<String> touchedFilePaths,
-      DiffFormatter diffFormatter)
-      throws IOException {
-    List<PatchListEntry> parentPatchListEntries = new ArrayList<>(parentDiffEntries.size());
-    for (DiffEntry parentDiffEntry : parentDiffEntries) {
-      if (!isTouched(touchedFilePaths, parentDiffEntry)) {
-        continue;
-      }
-      FileHeader fileHeader = toFileHeader(parentCommitB, diffFormatter, parentDiffEntry);
-      // The code which uses this PatchListEntry doesn't care about the last three parameters. As
-      // they are expensive to compute, we use arbitrary values for them.
-      PatchListEntry patchListEntry =
-          newEntry(parentCommitA.getTree(), fileHeader, ImmutableSet.of(), 0, 0);
-      parentPatchListEntries.add(patchListEntry);
-    }
-    return parentPatchListEntries;
-  }
-
-  private static Set<ContextAwareEdit> getEditsDueToRebase(
-      Multimap<String, ContextAwareEdit> editsDueToRebasePerFilePath, DiffEntry diffEntry) {
-    if (editsDueToRebasePerFilePath.isEmpty()) {
-      return ImmutableSet.of();
-    }
-
-    String filePath = diffEntry.getNewPath();
-    if (diffEntry.getChangeType() == ChangeType.DELETE) {
-      filePath = diffEntry.getOldPath();
-    }
-    return ImmutableSet.copyOf(editsDueToRebasePerFilePath.get(filePath));
-  }
-
-  private Optional<PatchListEntry> getPatchListEntry(
-      ObjectReader objectReader,
-      DiffFormatter diffFormatter,
-      DiffEntry diffEntry,
-      RevTree treeA,
-      RevTree treeB,
-      Set<ContextAwareEdit> editsDueToRebase)
-      throws IOException {
-    FileHeader fileHeader = toFileHeader(key.getNewId(), diffFormatter, diffEntry);
-    long oldSize =
-        getFileSize(
-            objectReader,
-            diffEntry.getOldId(),
-            diffEntry.getOldMode(),
-            diffEntry.getOldPath(),
-            treeA);
-    long newSize =
-        getFileSize(
-            objectReader,
-            diffEntry.getNewId(),
-            diffEntry.getNewMode(),
-            diffEntry.getNewPath(),
-            treeB);
-    Set<Edit> contentEditsDueToRebase = getContentEdits(editsDueToRebase);
-    PatchListEntry patchListEntry =
-        newEntry(treeA, fileHeader, contentEditsDueToRebase, newSize, newSize - oldSize);
-    // All edits in a file are due to rebase -> exclude the file from the diff.
-    if (EditTransformer.toEdits(toFileEdits(patchListEntry)).allMatch(editsDueToRebase::contains)) {
-      return Optional.empty();
-    }
-    return Optional.of(patchListEntry);
-  }
-
-  private static Set<Edit> getContentEdits(Set<ContextAwareEdit> editsDueToRebase) {
-    return editsDueToRebase.stream()
-        .map(ContextAwareEdit::toEdit)
-        .filter(Optional::isPresent)
-        .map(Optional::get)
-        .collect(toSet());
-  }
-
-  private ComparisonType getComparisonType(RevObject a, RevCommit b) {
-    for (int i = 0; i < b.getParentCount(); i++) {
-      if (b.getParent(i).equals(a)) {
-        return ComparisonType.againstParent(i + 1);
-      }
-    }
-
-    if (key.getOldId() == null && b.getParentCount() > 0) {
-      return ComparisonType.againstAutoMerge();
-    }
-
-    return ComparisonType.againstOtherPatchSet();
-  }
-
-  private static long getFileSize(
-      ObjectReader reader, AbbreviatedObjectId abbreviatedId, FileMode mode, String path, RevTree t)
-      throws IOException {
-    if (!isBlob(mode)) {
-      return 0;
-    }
-    ObjectId fileId =
-        toObjectId(reader, abbreviatedId).orElseGet(() -> lookupObjectId(reader, path, t));
-    if (ObjectId.zeroId().equals(fileId)) {
-      return 0;
-    }
-    return reader.getObjectSize(fileId, OBJ_BLOB);
-  }
-
-  private static boolean isBlob(FileMode mode) {
-    int t = mode.getBits() & FileMode.TYPE_MASK;
-    return t == FileMode.TYPE_FILE || t == FileMode.TYPE_SYMLINK;
-  }
-
-  private static Optional<ObjectId> toObjectId(
-      ObjectReader reader, AbbreviatedObjectId abbreviatedId) throws IOException {
-    if (abbreviatedId == null) {
-      // In theory, DiffEntry#getOldId or DiffEntry#getNewId can be null for pure renames or pure
-      // mode changes (e.g. DiffEntry#modify doesn't set the IDs). However, the method we call
-      // for diffs (DiffFormatter#scan) seems to always produce DiffEntries with set IDs, even for
-      // pure renames.
-      return Optional.empty();
-    }
-    if (abbreviatedId.isComplete()) {
-      // With the current JGit version and the method we call for diffs (DiffFormatter#scan), this
-      // is the only code path taken right now.
-      return Optional.ofNullable(abbreviatedId.toObjectId());
-    }
-    Collection<ObjectId> objectIds = reader.resolve(abbreviatedId);
-    // It seems very unlikely that an ObjectId which was just abbreviated by the diff computation
-    // now can't be resolved to exactly one ObjectId. The API allows this possibility, though.
-    return objectIds.size() == 1
-        ? Optional.of(Iterables.getOnlyElement(objectIds))
-        : Optional.empty();
-  }
-
-  private static ObjectId lookupObjectId(ObjectReader reader, String path, RevTree tree) {
-    // This variant is very expensive.
-    try (TreeWalk treeWalk = TreeWalk.forPath(reader, path, tree)) {
-      return treeWalk != null ? treeWalk.getObjectId(0) : ObjectId.zeroId();
-    } catch (IOException e) {
-      throw new StorageException(e);
-    }
-  }
-
-  private FileHeader toFileHeader(
-      ObjectId commitB, DiffFormatter diffFormatter, DiffEntry diffEntry) throws IOException {
-
-    Future<FileHeader> result =
-        diffExecutor.submit(
-            () -> {
-              synchronized (diffEntry) {
-                return diffFormatter.toFileHeader(diffEntry);
-              }
-            });
-
-    try {
-      return result.get(timeoutMillis, TimeUnit.MILLISECONDS);
-    } catch (InterruptedException | TimeoutException e) {
-      metrics.timeouts.increment();
-      logger.atWarning().log(
-          "%s ms timeout reached for Diff loader in project %s"
-              + " on commit %s on path %s comparing %s..%s",
-          timeoutMillis,
-          project,
-          commitB.name(),
-          diffEntry.getNewPath(),
-          diffEntry.getOldId().name(),
-          diffEntry.getNewId().name());
-      result.cancel(true);
-      synchronized (diffEntry) {
-        return toFileHeaderWithoutMyersDiff(diffFormatter, diffEntry);
-      }
-    } catch (ExecutionException e) {
-      // If there was an error computing the result, carry it
-      // up to the caller so the cache knows this key is invalid.
-      Throwables.throwIfInstanceOf(e.getCause(), IOException.class);
-      throw new IOException(e.getMessage(), e.getCause());
-    }
-  }
-
-  private FileHeader toFileHeaderWithoutMyersDiff(DiffFormatter diffFormatter, DiffEntry diffEntry)
-      throws IOException {
-    HistogramDiff histogramDiff = new HistogramDiff();
-    histogramDiff.setFallbackAlgorithm(null);
-    diffFormatter.setDiffAlgorithm(histogramDiff);
-    return diffFormatter.toFileHeader(diffEntry);
-  }
-
-  private PatchListEntry newCommitMessage(
-      RawTextComparator cmp, ObjectReader reader, RevCommit aCommit, RevCommit bCommit)
-      throws IOException {
-    Text aText = aCommit != null ? Text.forCommit(reader, aCommit) : Text.EMPTY;
-    Text bText = Text.forCommit(reader, bCommit);
-    return createPatchListEntry(cmp, aCommit, aText, bText, Patch.COMMIT_MSG);
-  }
-
-  private PatchListEntry newMergeList(
-      RawTextComparator cmp,
-      ObjectReader reader,
-      RevCommit aCommit,
-      RevCommit bCommit,
-      ComparisonType comparisonType)
-      throws IOException {
-    Text aText = aCommit != null ? Text.forMergeList(comparisonType, reader, aCommit) : Text.EMPTY;
-    Text bText = Text.forMergeList(comparisonType, reader, bCommit);
-    return createPatchListEntry(cmp, aCommit, aText, bText, Patch.MERGE_LIST);
-  }
-
-  private static PatchListEntry createPatchListEntry(
-      RawTextComparator cmp, RevCommit aCommit, Text aText, Text bText, String fileName) {
-    byte[] rawHdr = getRawHeader(aCommit != null, fileName);
-    byte[] aContent = aText.getContent();
-    byte[] bContent = bText.getContent();
-    long size = bContent.length;
-    long sizeDelta = size - aContent.length;
-    RawText aRawText = new RawText(aContent);
-    RawText bRawText = new RawText(bContent);
-    EditList edits = new HistogramDiff().diff(cmp, aRawText, bRawText);
-    FileHeader fh = new FileHeader(rawHdr, edits, PatchType.UNIFIED);
-    return new PatchListEntry(fh, edits, ImmutableSet.of(), size, sizeDelta);
-  }
-
-  private static byte[] getRawHeader(boolean hasA, String fileName) {
-    StringBuilder hdr = new StringBuilder();
-    hdr.append("diff --git");
-    if (hasA) {
-      hdr.append(" a/").append(fileName);
-    } else {
-      hdr.append(" ").append(FileHeader.DEV_NULL);
-    }
-    hdr.append(" b/").append(fileName);
-    hdr.append("\n");
-
-    if (hasA) {
-      hdr.append("--- a/").append(fileName).append("\n");
-    } else {
-      hdr.append("--- ").append(FileHeader.DEV_NULL).append("\n");
-    }
-    hdr.append("+++ b/").append(fileName).append("\n");
-    return hdr.toString().getBytes(UTF_8);
-  }
-
-  private static PatchListEntry newEntry(
-      RevTree aTree, FileHeader fileHeader, Set<Edit> editsDueToRebase, long size, long sizeDelta) {
-    if (aTree == null // want combined diff
-        || fileHeader.getPatchType() != PatchType.UNIFIED
-        || fileHeader.getHunks().isEmpty()) {
-      return new PatchListEntry(fileHeader, ImmutableList.of(), ImmutableSet.of(), size, sizeDelta);
-    }
-
-    List<Edit> edits = fileHeader.toEditList();
-    if (edits.isEmpty()) {
-      return new PatchListEntry(fileHeader, ImmutableList.of(), ImmutableSet.of(), size, sizeDelta);
-    }
-    return new PatchListEntry(fileHeader, edits, editsDueToRebase, size, sizeDelta);
-  }
-
-  private RevObject aFor(
-      PatchListKey key, Repository repo, RevWalk rw, InMemoryInserter ins, RevCommit b)
-      throws IOException {
-    if (key.getOldId() != null) {
-      return rw.parseAny(key.getOldId());
-    }
-
-    switch (b.getParentCount()) {
-      case 0:
-        return rw.parseAny(emptyTree(ins));
-      case 1:
-        {
-          RevCommit r = b.getParent(0);
-          rw.parseBody(r);
-          return r;
-        }
-      default:
-        if (key.getParentNum() != null) {
-          RevCommit r = b.getParent(key.getParentNum() - 1);
-          rw.parseBody(r);
-          return r;
-        }
-        // Only support auto-merge for 2 parents, not octopus merges
-        if (b.getParentCount() == 2) {
-          return autoMerger.lookupFromGitOrMergeInMemory(repo, rw, ins, b, mergeStrategy);
-        }
-        return null;
-    }
-  }
-
-  private static ObjectId emptyTree(ObjectInserter ins) throws IOException {
-    ObjectId id = ins.insert(Constants.OBJ_TREE, new byte[] {});
-    ins.flush();
-    return id;
-  }
-
-  @AutoValue
-  abstract static class EditsDueToRebaseResult {
-    public static EditsDueToRebaseResult create(
-        List<DiffEntry> relevantDiffEntries,
-        Multimap<String, ContextAwareEdit> editsDueToRebasePerFilePath) {
-      return new AutoValue_PatchListLoader_EditsDueToRebaseResult(
-          relevantDiffEntries, editsDueToRebasePerFilePath);
-    }
-
-    public abstract List<DiffEntry> getRelevantOriginalDiffEntries();
-
-    /** Returns the edits per file path they modify in {@code treeB}. */
-    public abstract Multimap<String, ContextAwareEdit> getEditsDueToRebasePerFilePath();
-  }
-}
diff --git a/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java b/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java
index f028def..63a29cc 100644
--- a/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java
+++ b/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java
@@ -25,8 +25,12 @@
 import com.google.gerrit.entities.SubmitRequirementExpressionResult;
 import com.google.gerrit.entities.SubmitRequirementExpressionResult.Status;
 import com.google.gerrit.entities.SubmitRequirementResult;
+import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.query.change.ChangeQueryBuilder;
 import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
 import org.eclipse.jgit.lib.ObjectId;
 
 /**
@@ -38,7 +42,25 @@
 
   private SubmitRequirementsAdapter() {}
 
-  public static List<SubmitRequirementResult> createResult(
+  /**
+   * Retrieve legacy submit records (created by label functions and other {@link
+   * com.google.gerrit.server.rules.SubmitRule}s) and convert them to submit requirement results.
+   */
+  public static Map<SubmitRequirement, SubmitRequirementResult> getLegacyRequirements(
+      SubmitRuleEvaluator.Factory evaluator, ChangeData cd) {
+    // We use SubmitRuleOptions.defaults() which does not recompute submit rules for closed changes.
+    // This doesn't have an effect since we never call this class (i.e. to evaluate submit
+    // requirements) for closed changes.
+    List<SubmitRecord> records = evaluator.create(SubmitRuleOptions.defaults()).evaluate(cd);
+    List<LabelType> labelTypes = cd.getLabelTypes().getLabelTypes();
+    ObjectId commitId = cd.currentPatchSet().commitId();
+    return records.stream()
+        .map(r -> createResult(r, labelTypes, commitId))
+        .flatMap(List::stream)
+        .collect(Collectors.toMap(sr -> sr.submitRequirement(), Function.identity()));
+  }
+
+  static List<SubmitRequirementResult> createResult(
       SubmitRecord record, List<LabelType> labelTypes, ObjectId psCommitId) {
     List<SubmitRequirementResult> results;
     if (record.ruleName.equals("gerrit~DefaultSubmitRule")) {
diff --git a/java/com/google/gerrit/server/project/SubmitRequirementsEvaluator.java b/java/com/google/gerrit/server/project/SubmitRequirementsEvaluator.java
index b3ac380..402bb51 100644
--- a/java/com/google/gerrit/server/project/SubmitRequirementsEvaluator.java
+++ b/java/com/google/gerrit/server/project/SubmitRequirementsEvaluator.java
@@ -26,8 +26,13 @@
   /**
    * Evaluate and return all submit requirement results for a change. Submit requirements are read
    * from the project config of the project containing the change as well as parent projects.
+   *
+   * @param cd change data corresponding to a specific gerrit change
+   * @param includeLegacy if set to true, evaluate legacy {@link
+   *     com.google.gerrit.entities.SubmitRecord}s and convert them to submit requirements.
    */
-  Map<SubmitRequirement, SubmitRequirementResult> evaluateAllRequirements(ChangeData cd);
+  Map<SubmitRequirement, SubmitRequirementResult> evaluateAllRequirements(
+      ChangeData cd, boolean includeLegacy);
 
   /** Evaluate a single {@link SubmitRequirement} using change data. */
   SubmitRequirementResult evaluateRequirement(SubmitRequirement sr, ChangeData cd);
diff --git a/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java b/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java
index 9be50c7..de637b4 100644
--- a/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java
+++ b/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java
@@ -17,8 +17,6 @@
 import static com.google.gerrit.server.project.ProjectCache.illegalState;
 
 import com.google.common.collect.ImmutableMap;
-import com.google.gerrit.entities.LabelType;
-import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.entities.SubmitRequirement;
 import com.google.gerrit.entities.SubmitRequirementExpression;
 import com.google.gerrit.entities.SubmitRequirementExpressionResult;
@@ -36,12 +34,8 @@
 import com.google.inject.Provider;
 import com.google.inject.Scopes;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 import java.util.Optional;
-import java.util.function.Function;
-import java.util.stream.Collectors;
-import org.eclipse.jgit.lib.ObjectId;
 
 /** Evaluates submit requirements for different change data. */
 public class SubmitRequirementsEvaluatorImpl implements SubmitRequirementsEvaluator {
@@ -81,12 +75,19 @@
   }
 
   @Override
-  public Map<SubmitRequirement, SubmitRequirementResult> evaluateAllRequirements(ChangeData cd) {
-    Map<SubmitRequirement, SubmitRequirementResult> result = getRequirements(cd);
-    if (experimentFeatures.isFeatureEnabled(
-        ExperimentFeaturesConstants
-            .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)) {
-      result.putAll(getLegacyRequirements(cd));
+  public Map<SubmitRequirement, SubmitRequirementResult> evaluateAllRequirements(
+      ChangeData cd, boolean includeLegacy) {
+    Map<SubmitRequirement, SubmitRequirementResult> projectConfigRequirements = getRequirements(cd);
+    Map<SubmitRequirement, SubmitRequirementResult> result = projectConfigRequirements;
+    if (includeLegacy
+        && experimentFeatures.isFeatureEnabled(
+            ExperimentFeaturesConstants
+                .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)) {
+      Map<SubmitRequirement, SubmitRequirementResult> legacyReqs =
+          SubmitRequirementsAdapter.getLegacyRequirements(legacyEvaluator, cd);
+      result =
+          SubmitRequirementsUtil.mergeLegacyAndNonLegacyRequirements(
+              projectConfigRequirements, legacyReqs);
     }
     return ImmutableMap.copyOf(result);
   }
@@ -140,23 +141,6 @@
     return result;
   }
 
-  /**
-   * Convert and return legacy submit records (created by label functions and other {@link
-   * com.google.gerrit.server.rules.SubmitRule}s to submit requirement results.
-   */
-  private Map<SubmitRequirement, SubmitRequirementResult> getLegacyRequirements(ChangeData cd) {
-    // We use SubmitRuleOptions.defaults() which does not recompute submit rules for closed changes.
-    // This doesn't have an effect since we never call this class (i.e. to evaluate submit
-    // requirements) for closed changes.
-    List<SubmitRecord> records = legacyEvaluator.create(SubmitRuleOptions.defaults()).evaluate(cd);
-    List<LabelType> labelTypes = cd.getLabelTypes().getLabelTypes();
-    ObjectId commitId = cd.currentPatchSet().commitId();
-    return records.stream()
-        .map(r -> SubmitRequirementsAdapter.createResult(r, labelTypes, commitId))
-        .flatMap(List::stream)
-        .collect(Collectors.toMap(sr -> sr.submitRequirement(), Function.identity()));
-  }
-
   /** Evaluate the predicate recursively using change data. */
   private PredicateResult evaluatePredicateTree(
       Predicate<ChangeData> predicate, ChangeData changeData) {
diff --git a/java/com/google/gerrit/server/project/SubmitRequirementsUtil.java b/java/com/google/gerrit/server/project/SubmitRequirementsUtil.java
new file mode 100644
index 0000000..2e43eac
--- /dev/null
+++ b/java/com/google/gerrit/server/project/SubmitRequirementsUtil.java
@@ -0,0 +1,71 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.project;
+
+import com.google.gerrit.entities.SubmitRequirement;
+import com.google.gerrit.entities.SubmitRequirementResult;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * A utility class for different operations related to {@link
+ * com.google.gerrit.entities.SubmitRequirement}s.
+ */
+public class SubmitRequirementsUtil {
+
+  private SubmitRequirementsUtil() {}
+
+  /**
+   * Merge legacy and non-legacy submit requirement results. If both input maps have submit
+   * requirements with the same name and fulfillment status (according to {@link
+   * SubmitRequirementResult#fulfilled()}), we eliminate the entry from the {@code
+   * legacyRequirements} input map and only include the one from the {@code
+   * projectConfigRequirements} in the result.
+   *
+   * @param projectConfigRequirements map of {@link SubmitRequirement} to {@link
+   *     SubmitRequirementResult} containing results for submit requirements stored in the
+   *     project.config.
+   * @param legacyRequirements map of {@link SubmitRequirement} to {@link SubmitRequirementResult}
+   *     containing the results of converting legacy submit records to submit requirements.
+   * @return a map that is the result of merging both input maps, while eliminating requirements
+   *     with the same name and status.
+   */
+  public static Map<SubmitRequirement, SubmitRequirementResult> mergeLegacyAndNonLegacyRequirements(
+      Map<SubmitRequirement, SubmitRequirementResult> projectConfigRequirements,
+      Map<SubmitRequirement, SubmitRequirementResult> legacyRequirements) {
+    Map<SubmitRequirement, SubmitRequirementResult> result = new HashMap<>();
+    result.putAll(projectConfigRequirements);
+    Map<String, SubmitRequirementResult> requirementsByName =
+        projectConfigRequirements.entrySet().stream()
+            .collect(Collectors.toMap(sr -> sr.getKey().name(), sr -> sr.getValue()));
+    for (Map.Entry<SubmitRequirement, SubmitRequirementResult> legacy :
+        legacyRequirements.entrySet()) {
+      String name = legacy.getKey().name();
+      SubmitRequirementResult projectConfigResult = requirementsByName.get(name);
+      SubmitRequirementResult legacyResult = legacy.getValue();
+      if (projectConfigResult != null && matchByStatus(projectConfigResult, legacyResult)) {
+        continue;
+      }
+      result.put(legacy.getKey(), legacy.getValue());
+    }
+    return result;
+  }
+
+  /** Returns true if both input results are equal in allowing/disallowing change submission. */
+  private static boolean matchByStatus(SubmitRequirementResult r1, SubmitRequirementResult r2) {
+    return r1.fulfilled() == r2.fulfilled();
+  }
+}
diff --git a/java/com/google/gerrit/server/query/approval/ListOfFilesUnchangedPredicate.java b/java/com/google/gerrit/server/query/approval/ListOfFilesUnchangedPredicate.java
index 55c27be..de7dd0a 100644
--- a/java/com/google/gerrit/server/query/approval/ListOfFilesUnchangedPredicate.java
+++ b/java/com/google/gerrit/server/query/approval/ListOfFilesUnchangedPredicate.java
@@ -58,13 +58,18 @@
     Integer parentNum =
         isInitialCommit(ctx.changeNotes().getProjectName(), targetPatchSet.commitId()) ? 0 : 1;
     try {
-      Map<String, FileDiffOutput> modifiedTargetPatchSet =
+      Map<String, FileDiffOutput> baseVsCurrent =
           diffOperations.listModifiedFilesAgainstParent(
               ctx.changeNotes().getProjectName(), targetPatchSet.commitId(), parentNum);
-      Map<String, FileDiffOutput> modifiedSourcePatchSet =
+      Map<String, FileDiffOutput> baseVsPrior =
           diffOperations.listModifiedFilesAgainstParent(
               ctx.changeNotes().getProjectName(), sourcePatchSet.commitId(), parentNum);
-      return match(modifiedTargetPatchSet, modifiedSourcePatchSet);
+      Map<String, FileDiffOutput> priorVsCurrent =
+          diffOperations.listModifiedFiles(
+              ctx.changeNotes().getProjectName(),
+              sourcePatchSet.commitId(),
+              targetPatchSet.commitId());
+      return match(baseVsCurrent, baseVsPrior, priorVsCurrent);
     } catch (DiffNotAvailableException ex) {
       throw new StorageException(
           "failed to compute difference in files, so won't copy"
@@ -79,16 +84,23 @@
    * {@link ChangeType} matches for each modified file.
    */
   public boolean match(
-      Map<String, FileDiffOutput> modifiedFiles1, Map<String, FileDiffOutput> modifiedFiles2) {
+      Map<String, FileDiffOutput> baseVsCurrent,
+      Map<String, FileDiffOutput> baseVsPrior,
+      Map<String, FileDiffOutput> priorVsCurrent) {
     Set<String> allFiles = new HashSet<>();
-    allFiles.addAll(modifiedFiles1.keySet());
-    allFiles.addAll(modifiedFiles2.keySet());
+    allFiles.addAll(baseVsCurrent.keySet());
+    allFiles.addAll(baseVsPrior.keySet());
     for (String file : allFiles) {
       if (Patch.isMagic(file)) {
         continue;
       }
-      FileDiffOutput fileDiffOutput1 = modifiedFiles1.get(file);
-      FileDiffOutput fileDiffOutput2 = modifiedFiles2.get(file);
+      FileDiffOutput fileDiffOutput1 = baseVsCurrent.get(file);
+      FileDiffOutput fileDiffOutput2 = baseVsPrior.get(file);
+      if (!priorVsCurrent.containsKey(file)) {
+        // If the file is not modified between prior and current patchsets, then scan safely skip
+        // it. The file might has been modified due to rebase.
+        continue;
+      }
       if (fileDiffOutput1 == null || fileDiffOutput2 == null) {
         return false;
       }
diff --git a/java/com/google/gerrit/server/query/change/ChangeData.java b/java/com/google/gerrit/server/query/change/ChangeData.java
index 6c74301..b8c8c07 100644
--- a/java/com/google/gerrit/server/query/change/ChangeData.java
+++ b/java/com/google/gerrit/server/query/change/ChangeData.java
@@ -75,6 +75,8 @@
 import com.google.gerrit.server.change.PureRevert;
 import com.google.gerrit.server.config.AllUsersName;
 import com.google.gerrit.server.config.TrackingFooters;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.MergeUtil;
 import com.google.gerrit.server.notedb.ChangeNotes;
@@ -87,7 +89,9 @@
 import com.google.gerrit.server.project.NoSuchChangeException;
 import com.google.gerrit.server.project.ProjectCache;
 import com.google.gerrit.server.project.ProjectState;
+import com.google.gerrit.server.project.SubmitRequirementsAdapter;
 import com.google.gerrit.server.project.SubmitRequirementsEvaluator;
+import com.google.gerrit.server.project.SubmitRequirementsUtil;
 import com.google.gerrit.server.project.SubmitRuleEvaluator;
 import com.google.gerrit.server.project.SubmitRuleOptions;
 import com.google.gerrit.server.util.time.TimeUtil;
@@ -268,7 +272,7 @@
     ChangeData cd =
         new ChangeData(
             null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-            null, null, project, id, null, null);
+            null, null, null, project, id, null, null);
     cd.currentPatchSet =
         PatchSet.builder()
             .id(PatchSet.id(id, currentPatchSetId))
@@ -286,6 +290,7 @@
   private final ChangeMessagesUtil cmUtil;
   private final ChangeNotes.Factory notesFactory;
   private final CommentsUtil commentsUtil;
+  private final ExperimentFeatures experimentFeatures;
   private final GitRepositoryManager repoManager;
   private final MergeUtil.Factory mergeUtilFactory;
   private final MergeabilityCache mergeabilityCache;
@@ -367,6 +372,7 @@
       ChangeMessagesUtil cmUtil,
       ChangeNotes.Factory notesFactory,
       CommentsUtil commentsUtil,
+      ExperimentFeatures experimentFeatures,
       GitRepositoryManager repoManager,
       MergeUtil.Factory mergeUtilFactory,
       MergeabilityCache mergeabilityCache,
@@ -386,6 +392,7 @@
     this.cmUtil = cmUtil;
     this.notesFactory = notesFactory;
     this.commentsUtil = commentsUtil;
+    this.experimentFeatures = experimentFeatures;
     this.repoManager = repoManager;
     this.mergeUtilFactory = mergeUtilFactory;
     this.mergeabilityCache = mergeabilityCache;
@@ -946,13 +953,28 @@
         return Collections.emptyMap();
       }
       Change c = change();
-      if (c != null && c.isClosed()) {
+      if (c == null || !c.isClosed()) {
+        // Open changes: Evaluate submit requirements online.
         submitRequirements =
-            notes().getSubmitRequirementsResult().stream()
-                .collect(Collectors.toMap(r -> r.submitRequirement(), Function.identity()));
-      } else {
-        submitRequirements = submitRequirementsEvaluator.evaluateAllRequirements(this);
+            submitRequirementsEvaluator.evaluateAllRequirements(this, /* includeLegacy= */ true);
+        return submitRequirements;
       }
+      // Closed changes: Load submit requirement results from NoteDb.
+      Map<SubmitRequirement, SubmitRequirementResult> projectConfigRequirements =
+          notes().getSubmitRequirementsResult().stream()
+              .filter(r -> !r.legacy())
+              .collect(Collectors.toMap(r -> r.submitRequirement(), Function.identity()));
+      if (!experimentFeatures.isFeatureEnabled(
+          ExperimentFeaturesConstants
+              .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)) {
+        submitRequirements = projectConfigRequirements;
+        return submitRequirements;
+      }
+      Map<SubmitRequirement, SubmitRequirementResult> legacyRequirements =
+          SubmitRequirementsAdapter.getLegacyRequirements(submitRuleEvaluatorFactory, this);
+      submitRequirements =
+          SubmitRequirementsUtil.mergeLegacyAndNonLegacyRequirements(
+              projectConfigRequirements, legacyRequirements);
     }
     return submitRequirements;
   }
diff --git a/java/com/google/gerrit/server/restapi/change/GetRelated.java b/java/com/google/gerrit/server/restapi/change/GetRelated.java
index ba1a1dc..0eef468 100644
--- a/java/com/google/gerrit/server/restapi/change/GetRelated.java
+++ b/java/com/google/gerrit/server/restapi/change/GetRelated.java
@@ -14,10 +14,6 @@
 
 package com.google.gerrit.server.restapi.change;
 
-import static com.google.common.base.Preconditions.checkArgument;
-import static java.util.stream.Collectors.toSet;
-
-import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.Lists;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
@@ -29,56 +25,39 @@
 import com.google.gerrit.extensions.common.CommitInfo;
 import com.google.gerrit.extensions.restapi.Response;
 import com.google.gerrit.extensions.restapi.RestReadView;
-import com.google.gerrit.index.IndexConfig;
 import com.google.gerrit.server.ChangeUtil;
 import com.google.gerrit.server.CommonConverters;
-import com.google.gerrit.server.PatchSetUtil;
+import com.google.gerrit.server.change.GetRelatedChangesUtil;
+import com.google.gerrit.server.change.RelatedChangesSorter;
 import com.google.gerrit.server.change.RevisionResource;
-import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.gerrit.server.project.NoSuchProjectException;
 import com.google.gerrit.server.query.change.ChangeData;
-import com.google.gerrit.server.query.change.InternalChangeQuery;
 import com.google.inject.Inject;
-import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
-import java.util.Set;
-import org.eclipse.jgit.errors.RepositoryNotFoundException;
 import org.eclipse.jgit.revwalk.RevCommit;
 
 @Singleton
 public class GetRelated implements RestReadView<RevisionResource> {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
 
-  private final Provider<InternalChangeQuery> queryProvider;
-  private final PatchSetUtil psUtil;
-  private final RelatedChangesSorter sorter;
-  private final IndexConfig indexConfig;
   private final ChangeData.Factory changeDataFactory;
+  private final GetRelatedChangesUtil getRelatedChangesUtil;
 
   @Inject
-  GetRelated(
-      Provider<InternalChangeQuery> queryProvider,
-      PatchSetUtil psUtil,
-      RelatedChangesSorter sorter,
-      IndexConfig indexConfig,
-      ChangeData.Factory changeDataFactory) {
-    this.queryProvider = queryProvider;
-    this.psUtil = psUtil;
-    this.sorter = sorter;
-    this.indexConfig = indexConfig;
+  GetRelated(ChangeData.Factory changeDataFactory, GetRelatedChangesUtil getRelatedChangesUtil) {
     this.changeDataFactory = changeDataFactory;
+    this.getRelatedChangesUtil = getRelatedChangesUtil;
   }
 
   @Override
   public Response<RelatedChangesInfo> apply(RevisionResource rsrc)
-      throws RepositoryNotFoundException, IOException, NoSuchProjectException,
-          PermissionBackendException {
+      throws IOException, NoSuchProjectException, PermissionBackendException {
     RelatedChangesInfo relatedChangesInfo = new RelatedChangesInfo();
     relatedChangesInfo.changes = getRelated(rsrc);
     return Response.ok(relatedChangesInfo);
@@ -86,30 +65,15 @@
 
   public List<RelatedChangeAndCommitInfo> getRelated(RevisionResource rsrc)
       throws IOException, PermissionBackendException {
-    Set<String> groups = getAllGroups(rsrc.getNotes(), psUtil);
-    logger.atFine().log("groups = %s", groups);
-    if (groups.isEmpty()) {
-      return Collections.emptyList();
-    }
-
-    List<ChangeData> cds =
-        InternalChangeQuery.byProjectGroups(
-            queryProvider, indexConfig, rsrc.getChange().getProject(), groups);
-    if (cds.isEmpty()) {
-      return Collections.emptyList();
-    }
-    if (cds.size() == 1 && cds.get(0).getId().equals(rsrc.getChange().getId())) {
-      return Collections.emptyList();
-    }
-    List<RelatedChangeAndCommitInfo> result = new ArrayList<>(cds.size());
-
     boolean isEdit = rsrc.getEdit().isPresent();
     PatchSet basePs = isEdit ? rsrc.getEdit().get().getBasePatchSet() : rsrc.getPatchSet();
     logger.atFine().log("isEdit = %s, basePs = %s", isEdit, basePs);
 
-    cds = reloadChangeIfStale(cds, rsrc.getChange(), basePs);
+    List<RelatedChangesSorter.PatchSetData> sortedResult =
+        getRelatedChangesUtil.getRelated(changeDataFactory.create(rsrc.getNotes()), basePs);
 
-    for (RelatedChangesSorter.PatchSetData d : sorter.sort(cds, basePs)) {
+    List<RelatedChangeAndCommitInfo> result = new ArrayList<>(sortedResult.size());
+    for (RelatedChangesSorter.PatchSetData d : sortedResult) {
       PatchSet ps = d.patchSet();
       RevCommit commit;
       if (isEdit && ps.id().equals(basePs.id())) {
@@ -134,37 +98,6 @@
     return result;
   }
 
-  @VisibleForTesting
-  public static Set<String> getAllGroups(ChangeNotes notes, PatchSetUtil psUtil) {
-    return psUtil.byChange(notes).stream().flatMap(ps -> ps.groups().stream()).collect(toSet());
-  }
-
-  private List<ChangeData> reloadChangeIfStale(
-      List<ChangeData> changeDatasFromIndex, Change wantedChange, PatchSet wantedPs) {
-    checkArgument(
-        wantedChange.getId().equals(wantedPs.id().changeId()),
-        "change of wantedPs (%s) doesn't match wantedChange (%s)",
-        wantedPs.id().changeId(),
-        wantedChange.getId());
-
-    List<ChangeData> changeDatas = new ArrayList<>(changeDatasFromIndex.size() + 1);
-    changeDatas.addAll(changeDatasFromIndex);
-
-    // Reload the change in case the patch set is absent.
-    changeDatas.stream()
-        .filter(
-            cd -> cd.getId().equals(wantedPs.id().changeId()) && cd.patchSet(wantedPs.id()) == null)
-        .forEach(ChangeData::reloadChange);
-
-    if (changeDatas.stream().noneMatch(cd -> cd.getId().equals(wantedPs.id().changeId()))) {
-      // The change of the wanted patch set is missing in the result from the index.
-      // Load it from NoteDb and add it to the result.
-      changeDatas.add(changeDataFactory.create(wantedChange));
-    }
-
-    return changeDatas;
-  }
-
   static RelatedChangeAndCommitInfo newChangeAndCommit(
       Project.NameKey project, @Nullable Change change, @Nullable PatchSet ps, RevCommit c) {
     RelatedChangeAndCommitInfo info = new RelatedChangeAndCommitInfo();
diff --git a/java/com/google/gerrit/server/restapi/change/PostReview.java b/java/com/google/gerrit/server/restapi/change/PostReview.java
index 5002a82..5c252f4 100644
--- a/java/com/google/gerrit/server/restapi/change/PostReview.java
+++ b/java/com/google/gerrit/server/restapi/change/PostReview.java
@@ -92,7 +92,9 @@
 import com.google.gerrit.server.PatchSetUtil;
 import com.google.gerrit.server.PublishCommentUtil;
 import com.google.gerrit.server.ReviewerSet;
+import com.google.gerrit.server.account.AccountCache;
 import com.google.gerrit.server.account.AccountResolver;
+import com.google.gerrit.server.account.AccountState;
 import com.google.gerrit.server.approval.ApprovalsUtil;
 import com.google.gerrit.server.change.ChangeResource;
 import com.google.gerrit.server.change.EmailReviewComments;
@@ -105,6 +107,7 @@
 import com.google.gerrit.server.change.WorkInProgressOp;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.extensions.events.CommentAdded;
+import com.google.gerrit.server.extensions.events.ReviewerAdded;
 import com.google.gerrit.server.logging.Metadata;
 import com.google.gerrit.server.logging.TraceContext;
 import com.google.gerrit.server.notedb.ChangeNotes;
@@ -187,6 +190,7 @@
   private final BatchUpdate.Factory updateFactory;
   private final ChangeResource.Factory changeResourceFactory;
   private final ChangeData.Factory changeDataFactory;
+  private final AccountCache accountCache;
   private final ApprovalsUtil approvalsUtil;
   private final ChangeMessagesUtil cmUtil;
   private final CommentsUtil commentsUtil;
@@ -206,6 +210,7 @@
   private final PluginSetContext<CommentValidator> commentValidators;
   private final PluginSetContext<OnPostReview> onPostReviews;
   private final ReplyAttentionSetUpdates replyAttentionSetUpdates;
+  private final ReviewerAdded reviewerAdded;
   private final boolean strictLabels;
   private final boolean publishPatchSetLevelComment;
 
@@ -214,6 +219,7 @@
       BatchUpdate.Factory updateFactory,
       ChangeResource.Factory changeResourceFactory,
       ChangeData.Factory changeDataFactory,
+      AccountCache accountCache,
       ApprovalsUtil approvalsUtil,
       ChangeMessagesUtil cmUtil,
       CommentsUtil commentsUtil,
@@ -233,10 +239,12 @@
       PermissionBackend permissionBackend,
       PluginSetContext<CommentValidator> commentValidators,
       PluginSetContext<OnPostReview> onPostReviews,
-      ReplyAttentionSetUpdates replyAttentionSetUpdates) {
+      ReplyAttentionSetUpdates replyAttentionSetUpdates,
+      ReviewerAdded reviewerAdded) {
     this.updateFactory = updateFactory;
     this.changeResourceFactory = changeResourceFactory;
     this.changeDataFactory = changeDataFactory;
+    this.accountCache = accountCache;
     this.commentsUtil = commentsUtil;
     this.publishCommentUtil = publishCommentUtil;
     this.psUtil = psUtil;
@@ -256,6 +264,7 @@
     this.commentValidators = commentValidators;
     this.onPostReviews = onPostReviews;
     this.replyAttentionSetUpdates = replyAttentionSetUpdates;
+    this.reviewerAdded = reviewerAdded;
     this.strictLabels = gerritConfig.getBoolean("change", "strictLabels", false);
     this.publishPatchSetLevelComment =
         gerritConfig.getBoolean("event", "comment-added", "publishPatchSetLevelComment", true);
@@ -371,6 +380,7 @@
       logger.atFine().log("adding reviewer additions");
       for (ReviewerModification reviewerResult : reviewerResults) {
         reviewerResult.op.suppressEmail(); // Send a single batch email below.
+        reviewerResult.op.suppressEvent(); // Send events below, if possible as batch.
         bu.addOp(revision.getChange().getId(), reviewerResult.op);
         if (!ccOrReviewer && reviewerResult.reviewers.contains(account)) {
           logger.atFine().log("calling user is explicitly added as reviewer or CC");
@@ -386,6 +396,7 @@
         ReviewerModification selfAddition =
             reviewerModifier.ccCurrentUser(revision.getUser(), revision);
         selfAddition.op.suppressEmail();
+        selfAddition.op.suppressEvent();
         bu.addOp(revision.getChange().getId(), selfAddition.op);
       }
 
@@ -433,8 +444,10 @@
         reviewerResult.gatherResults(cd);
       }
 
-      // Sending from AddReviewersOp was suppressed so we can send a single batch email here.
+      // Sending emails and events from ReviewersOps was suppressed so we can send a single batch
+      // email/event here.
       batchEmailReviewers(revision.getUser(), revision.getChange(), reviewerResults, notify);
+      batchReviewerEvents(revision.getUser(), cd, revision.getPatchSet(), reviewerResults, ts);
     }
 
     return Response.ok(output);
@@ -512,6 +525,35 @@
     }
   }
 
+  private void batchReviewerEvents(
+      CurrentUser user,
+      ChangeData cd,
+      PatchSet patchSet,
+      List<ReviewerModification> reviewerModifications,
+      Timestamp when) {
+    List<AccountState> newlyAddedReviewers = new ArrayList<>();
+
+    // There are no events for CCs and reviewers added/deleted by email.
+    for (ReviewerModification modification : reviewerModifications) {
+      Result reviewerAdditionResult = modification.op.getResult();
+      if (modification.state() == ReviewerState.REVIEWER) {
+        newlyAddedReviewers.addAll(
+            reviewerAdditionResult.addedReviewers().stream()
+                .map(psa -> psa.accountId())
+                .map(accountId -> accountCache.get(accountId))
+                .flatMap(Streams::stream)
+                .collect(toList()));
+      } else if (modification.state() == ReviewerState.REMOVED) {
+        // There is no batch event for reviewer removals, hence fire the event for each
+        // modification that deleted a reviewer immediately.
+        modification.op.sendEvent();
+      }
+    }
+
+    // Fire a batch event for all newly added reviewers.
+    reviewerAdded.fire(cd, patchSet, newlyAddedReviewers, user.asIdentifiedUser().state(), when);
+  }
+
   private RevisionResource onBehalfOf(RevisionResource rev, LabelTypes labelTypes, ReviewInput in)
       throws BadRequestException, AuthException, UnprocessableEntityException,
           PermissionBackendException, IOException, ConfigInvalidException {
diff --git a/java/com/google/gerrit/server/restapi/project/ListProjects.java b/java/com/google/gerrit/server/restapi/project/ListProjects.java
index c4ae33a..4d8005b 100644
--- a/java/com/google/gerrit/server/restapi/project/ListProjects.java
+++ b/java/com/google/gerrit/server/restapi/project/ListProjects.java
@@ -490,7 +490,7 @@
                 continue;
               }
 
-              List<Ref> refs = retrieveBranchRefs(e);
+              List<Ref> refs = retrieveBranchRefs(e, git);
               if (!hasValidRef(refs)) {
                 continue;
               }
@@ -578,17 +578,12 @@
     }
   }
 
-  private List<Ref> retrieveBranchRefs(ProjectState e) throws PermissionBackendException {
-    boolean canReadAllRefs = e.statePermitsRead();
-    if (canReadAllRefs) {
-      try {
-        permissionBackend.user(currentUser).project(e.getNameKey()).check(ProjectPermission.READ);
-      } catch (AuthException exp) {
-        canReadAllRefs = false;
-      }
+  private List<Ref> retrieveBranchRefs(ProjectState e, Repository git) {
+    if (!e.statePermitsRead()) {
+      return ImmutableList.of();
     }
 
-    return getBranchRefs(e.getNameKey(), canReadAllRefs);
+    return getBranchRefs(e.getNameKey(), git);
   }
 
   private void addParentProjectInfo(
@@ -708,15 +703,13 @@
     stdout.flush();
   }
 
-  private List<Ref> getBranchRefs(Project.NameKey projectName, boolean canReadAllRefs) {
+  private List<Ref> getBranchRefs(Project.NameKey projectName, Repository git) {
     Ref[] result = new Ref[showBranch.size()];
-    try (Repository git = repoManager.openRepository(projectName)) {
+    try {
       PermissionBackend.ForProject perm = permissionBackend.user(currentUser).project(projectName);
       for (int i = 0; i < showBranch.size(); i++) {
         Ref ref = git.findRef(showBranch.get(i));
-        if (all && canReadAllRefs) {
-          result[i] = ref;
-        } else if (ref != null && ref.getObjectId() != null) {
+        if (ref != null && ref.getObjectId() != null) {
           try {
             perm.ref(ref.getLeaf().getName()).check(RefPermission.READ);
             result[i] = ref;
diff --git a/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java b/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
index ac67444..52202d7 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
@@ -99,10 +99,12 @@
 import com.google.gerrit.entities.LabelFunction;
 import com.google.gerrit.entities.LabelId;
 import com.google.gerrit.entities.LabelType;
+import com.google.gerrit.entities.LegacySubmitRequirement;
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.Permission;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.entities.RefNames;
+import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.entities.SubmitRequirement;
 import com.google.gerrit.entities.SubmitRequirementExpression;
 import com.google.gerrit.entities.SubmitRequirementExpressionResult;
@@ -148,7 +150,9 @@
 import com.google.gerrit.extensions.common.CommitInfo;
 import com.google.gerrit.extensions.common.GitPerson;
 import com.google.gerrit.extensions.common.LabelInfo;
+import com.google.gerrit.extensions.common.LegacySubmitRequirementInfo;
 import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.common.SubmitRecordInfo;
 import com.google.gerrit.extensions.common.SubmitRequirementResultInfo;
 import com.google.gerrit.extensions.common.SubmitRequirementResultInfo.Status;
 import com.google.gerrit.extensions.common.TrackingIdInfo;
@@ -180,12 +184,11 @@
 import com.google.gerrit.server.patch.DiffSummaryKey;
 import com.google.gerrit.server.patch.IntraLineDiff;
 import com.google.gerrit.server.patch.IntraLineDiffKey;
-import com.google.gerrit.server.patch.PatchList;
-import com.google.gerrit.server.patch.PatchListKey;
 import com.google.gerrit.server.project.testing.TestLabels;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.query.change.ChangeQueryBuilder.ChangeOperatorFactory;
 import com.google.gerrit.server.restapi.change.PostReview;
+import com.google.gerrit.server.rules.SubmitRule;
 import com.google.gerrit.server.update.BatchUpdate;
 import com.google.gerrit.server.update.BatchUpdateOp;
 import com.google.gerrit.server.update.ChangeContext;
@@ -238,10 +241,6 @@
   @Inject private ExtensionRegistry extensionRegistry;
 
   @Inject
-  @Named("diff")
-  private Cache<PatchListKey, PatchList> fileCache;
-
-  @Inject
   @Named("diff_intraline")
   private Cache<IntraLineDiffKey, IntraLineDiff> intraCache;
 
@@ -302,13 +301,10 @@
     String fileContent = "First line\nSecond line\n";
     PushOneCommit.Result result = createChange("Add a file", fileName, fileContent);
     String triplet = project.get() + "~master~" + result.getChangeId();
-    CacheStats startPatch = cloneStats(fileCache.stats());
     CacheStats startIntra = cloneStats(intraCache.stats());
     CacheStats startSummary = cloneStats(diffSummaryCache.stats());
     gApi.changes().id(triplet).get(ImmutableList.of(ListChangesOption.SKIP_DIFFSTAT));
 
-    assertThat(fileCache.stats()).since(startPatch).hasMissCount(0);
-    assertThat(fileCache.stats()).since(startPatch).hasHitCount(0);
     assertThat(intraCache.stats()).since(startIntra).hasMissCount(0);
     assertThat(intraCache.stats()).since(startIntra).hasHitCount(0);
     assertThat(diffSummaryCache.stats()).since(startSummary).hasMissCount(0);
@@ -4033,6 +4029,51 @@
   }
 
   @Test
+  public void submitRecords() throws Exception {
+    PushOneCommit.Result r = createChange();
+    TestSubmitRule testSubmitRule = new TestSubmitRule();
+    try (Registration registration = extensionRegistry.newRegistration().add(testSubmitRule)) {
+      String changeId = r.getChangeId();
+
+      ChangeInfo change = gApi.changes().id(changeId).get();
+      assertThat(change.submitRecords).hasSize(2);
+      // Check the default submit record for the code-review label
+      SubmitRecordInfo codeReviewRecord = Iterables.get(change.submitRecords, 0);
+      assertThat(codeReviewRecord.ruleName).isEqualTo("gerrit~DefaultSubmitRule");
+      assertThat(codeReviewRecord.status).isEqualTo(SubmitRecordInfo.Status.NOT_READY);
+      assertThat(codeReviewRecord.labels).hasSize(1);
+      SubmitRecordInfo.Label label = Iterables.getOnlyElement(codeReviewRecord.labels);
+      assertThat(label.label).isEqualTo("Code-Review");
+      assertThat(label.status).isEqualTo(SubmitRecordInfo.Label.Status.NEED);
+      assertThat(label.appliedBy).isNull();
+      // Check the custom test record created by the TestSubmitRule
+      SubmitRecordInfo testRecord = Iterables.get(change.submitRecords, 1);
+      assertThat(testRecord.ruleName).isEqualTo("gerrit~TestSubmitRule");
+      assertThat(testRecord.status).isEqualTo(SubmitRecordInfo.Status.OK);
+      assertThat(testRecord.requirements)
+          .containsExactly(new LegacySubmitRequirementInfo("OK", "fallback text", "type"));
+      assertThat(testRecord.labels).hasSize(1);
+      SubmitRecordInfo.Label testLabel = Iterables.getOnlyElement(testRecord.labels);
+      assertThat(testLabel.label).isEqualTo("label");
+      assertThat(testLabel.status).isEqualTo(SubmitRecordInfo.Label.Status.OK);
+      assertThat(testLabel.appliedBy).isNull();
+
+      voteLabel(changeId, "code-review", 2);
+      // Code review record is satisfied after voting +2
+      change = gApi.changes().id(changeId).get();
+      assertThat(change.submitRecords).hasSize(2);
+      codeReviewRecord = Iterables.get(change.submitRecords, 0);
+      assertThat(codeReviewRecord.ruleName).isEqualTo("gerrit~DefaultSubmitRule");
+      assertThat(codeReviewRecord.status).isEqualTo(SubmitRecordInfo.Status.OK);
+      assertThat(codeReviewRecord.labels).hasSize(1);
+      label = Iterables.getOnlyElement(codeReviewRecord.labels);
+      assertThat(label.label).isEqualTo("Code-Review");
+      assertThat(label.status).isEqualTo(SubmitRecordInfo.Label.Status.OK);
+      assertThat(label.appliedBy._accountId).isEqualTo(admin.id().get());
+    }
+  }
+
+  @Test
   public void submitRequirement_withLabelEqualsMax() throws Exception {
     configSubmitRequirement(
         project,
@@ -4498,6 +4539,129 @@
       value =
           ExperimentFeaturesConstants
               .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)
+  public void
+      submitRequirements_returnOneEntryForMatchingLegacyAndNonLegacyResultsWithTheSameName_ifLegacySubmitRecordsAreEnabled()
+          throws Exception {
+    // Configure a legacy submit requirement: label with a max with block function
+    configLabel("build-cop-override", LabelFunction.MAX_WITH_BLOCK);
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(
+            allowLabel("build-cop-override")
+                .ref("refs/heads/master")
+                .group(REGISTERED_USERS)
+                .range(-1, 1))
+        .update();
+
+    // Configure a submit requirement with the same name.
+    configSubmitRequirement(
+        project,
+        SubmitRequirement.builder()
+            .setName("build-cop-override")
+            .setSubmittabilityExpression(
+                SubmitRequirementExpression.create(
+                    "label:build-cop-override=MAX -label:build-cop-override=MIN"))
+            .setAllowOverrideInChildProjects(false)
+            .build());
+
+    // Create a change. Vote to fulfill all requirements.
+    PushOneCommit.Result r = createChange();
+    String changeId = r.getChangeId();
+    voteLabel(changeId, "build-cop-override", 1);
+    voteLabel(changeId, "Code-Review", 2);
+
+    // Project has two legacy requirements: Code-Review and bco, and a non-legacy requirement: bco.
+    // Only non-legacy bco is returned.
+    ChangeInfo change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(2);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.SATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements,
+        "build-cop-override",
+        Status.SATISFIED,
+        /* isLegacy= */ false,
+        /* submittabilityCondition= */ "label:build-cop-override=MAX -label:build-cop-override=MIN");
+
+    // Merge the change. Submit requirements are still the same.
+    gApi.changes().id(changeId).current().submit();
+    change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(2);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.SATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements,
+        "build-cop-override",
+        Status.SATISFIED,
+        /* isLegacy= */ false,
+        /* submittabilityCondition= */ "label:build-cop-override=MAX -label:build-cop-override=MIN");
+  }
+
+  @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      value =
+          ExperimentFeaturesConstants
+              .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)
+  public void
+      submitRequirements_returnTwoEntriesForMismatchingLegacyAndNonLegacyResultsWithTheSameName_ifLegacySubmitRecordsAreEnabled()
+          throws Exception {
+    // Configure a legacy submit requirement: label with a max with block function
+    configLabel("build-cop-override", LabelFunction.MAX_WITH_BLOCK);
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(
+            allowLabel("build-cop-override")
+                .ref("refs/heads/master")
+                .group(REGISTERED_USERS)
+                .range(-1, 1))
+        .update();
+
+    // Configure a submit requirement with the same name.
+    configSubmitRequirement(
+        project,
+        SubmitRequirement.builder()
+            .setName("build-cop-override")
+            .setSubmittabilityExpression(
+                SubmitRequirementExpression.create("label:build-cop-override=MIN"))
+            .setAllowOverrideInChildProjects(false)
+            .build());
+
+    // Create a change
+    PushOneCommit.Result r = createChange();
+    String changeId = r.getChangeId();
+    voteLabel(changeId, "build-cop-override", 1);
+    voteLabel(changeId, "Code-Review", 2);
+
+    // Project has two legacy requirements: Code-Review and bco, and a non-legacy requirement: bco.
+    // Two instances of bco will be returned since their status is not matching.
+    ChangeInfo change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(3);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.SATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements,
+        "build-cop-override",
+        Status.SATISFIED,
+        /* isLegacy= */ true,
+        // MAX_WITH_BLOCK function was translated to a submittability expression.
+        /* submittabilityCondition= */ "label:build-cop-override=MAX -label:build-cop-override=MIN");
+    assertSubmitRequirementStatus(
+        change.submitRequirements,
+        "build-cop-override",
+        Status.UNSATISFIED,
+        /* isLegacy= */ false,
+        /* submittabilityCondition= */ "label:build-cop-override=MIN");
+  }
+
+  @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      value =
+          ExperimentFeaturesConstants
+              .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)
   public void submitRequirements_returnForLegacySubmitRecords_ifEnabled() throws Exception {
     configLabel("build-cop-override", LabelFunction.MAX_WITH_BLOCK);
     projectOperations
@@ -4541,6 +4705,7 @@
     // 4. Merge the change. Submit requirements status is presented from NoteDb.
     gApi.changes().id(changeId).current().submit();
     change = gApi.changes().id(changeId).get();
+    // Legacy submit records are returned as submit requirements.
     assertThat(change.submitRequirements).hasSize(2);
     assertSubmitRequirementStatus(
         change.submitRequirements, "Code-Review", Status.SATISFIED, /* isLegacy= */ true);
@@ -4928,6 +5093,28 @@
   }
 
   @Test
+  @GerritConfig(name = "trackingid.jira-bug.footer", value = "Bug:")
+  @GerritConfig(name = "trackingid.jira-bug.match", value = "\\d+")
+  @GerritConfig(name = "trackingid.jira-bug.system", value = "JIRA")
+  public void multipleTrackingIdsInSingleFooter() throws Exception {
+    PushOneCommit push =
+        pushFactory.create(
+            admin.newIdent(),
+            testRepo,
+            PushOneCommit.SUBJECT + "\n\n" + "Bug: 123, 456",
+            PushOneCommit.FILE_NAME,
+            PushOneCommit.FILE_CONTENT);
+    PushOneCommit.Result result = push.to("refs/for/master");
+    result.assertOkStatus();
+
+    ChangeInfo change = gApi.changes().id(result.getChangeId()).get(TRACKING_IDS);
+    Collection<TrackingIdInfo> trackingIds = change.trackingIds;
+    assertThat(trackingIds).isNotNull();
+    assertThat(trackingIds).hasSize(2);
+    assertThat(trackingIds.stream().map(t -> t.id)).containsExactly("123", "456");
+  }
+
+  @Test
   public void starUnstar() throws Exception {
     ChangeIndexedCounter changeIndexedCounter = new ChangeIndexedCounter();
     try (Registration registration =
@@ -5133,6 +5320,30 @@
       Collection<SubmitRequirementResultInfo> results,
       String requirementName,
       SubmitRequirementResultInfo.Status status,
+      boolean isLegacy,
+      String submittabilityCondition) {
+    for (SubmitRequirementResultInfo result : results) {
+      if (result.name.equals(requirementName)
+          && result.status == status
+          && result.isLegacy == isLegacy
+          && result.submittabilityExpressionResult.expression.equals(submittabilityCondition)) {
+        return;
+      }
+    }
+    throw new AssertionError(
+        String.format(
+            "Could not find submit requirement %s with status %s (results = %s)",
+            requirementName,
+            status,
+            results.stream()
+                .map(r -> String.format("%s=%s", r.name, r.status))
+                .collect(toImmutableList())));
+  }
+
+  private void assertSubmitRequirementStatus(
+      Collection<SubmitRequirementResultInfo> results,
+      String requirementName,
+      SubmitRequirementResultInfo.Status status,
       boolean isLegacy) {
     for (SubmitRequirementResultInfo result : results) {
       if (result.name.equals(requirementName)
@@ -5161,4 +5372,25 @@
         .update();
     return project;
   }
+
+  /** Returns a hard-coded submit record containing all fields. */
+  private static class TestSubmitRule implements SubmitRule {
+    @Override
+    public Optional<SubmitRecord> evaluate(ChangeData changeData) {
+      SubmitRecord record = new SubmitRecord();
+      record.ruleName = "testSubmitRule";
+      record.status = SubmitRecord.Status.OK;
+      SubmitRecord.Label label = new SubmitRecord.Label();
+      label.label = "label";
+      label.status = SubmitRecord.Label.Status.OK;
+      record.labels = Arrays.asList(label);
+      record.requirements =
+          Arrays.asList(
+              LegacySubmitRequirement.builder()
+                  .setType("type")
+                  .setFallbackText("fallback text")
+                  .build());
+      return Optional.of(record);
+    }
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java b/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
index b79be80..96bc65d 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
@@ -27,6 +27,7 @@
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.truth.Correspondence;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
@@ -56,6 +57,8 @@
 import com.google.gerrit.extensions.common.RobotCommentInfo;
 import com.google.gerrit.extensions.config.FactoryModule;
 import com.google.gerrit.extensions.events.CommentAddedListener;
+import com.google.gerrit.extensions.events.ReviewerAddedListener;
+import com.google.gerrit.extensions.events.ReviewerDeletedListener;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.RestApiException;
@@ -74,6 +77,7 @@
 import com.google.inject.Inject;
 import com.google.inject.Module;
 import java.sql.Timestamp;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -699,6 +703,61 @@
   }
 
   @Test
+  public void addingReviewers() throws Exception {
+    PushOneCommit.Result r = createChange();
+
+    TestAccount user2 = accountCreator.user2();
+
+    TestReviewerAddedListener testReviewerAddedListener = new TestReviewerAddedListener();
+    try (Registration registration =
+        extensionRegistry.newRegistration().add(testReviewerAddedListener)) {
+      // add user and user2
+      ReviewResult reviewResult =
+          gApi.changes()
+              .id(r.getChangeId())
+              .current()
+              .review(ReviewInput.create().reviewer(user.email()).reviewer(user2.email()));
+
+      assertThat(
+              reviewResult.reviewers.values().stream()
+                  .filter(a -> a.reviewers != null)
+                  .map(a -> Iterables.getOnlyElement(a.reviewers).name)
+                  .collect(toImmutableSet()))
+          .containsExactly(user.fullName(), user2.fullName());
+    }
+
+    assertThat(
+            gApi.changes().id(r.getChangeId()).reviewers().stream()
+                .map(a -> a.name)
+                .collect(toImmutableSet()))
+        .containsExactly(user.fullName(), user2.fullName());
+
+    // Ensure only one batch email was sent for this operation
+    FakeEmailSender.Message message = Iterables.getOnlyElement(sender.getMessages());
+    assertThat(message.body())
+        .containsMatch(
+            Pattern.quote("Hello ")
+                + "("
+                + Pattern.quote(String.format("%s, %s", user.fullName(), user2.fullName()))
+                + "|"
+                + Pattern.quote(String.format("%s, %s", user2.fullName(), user.fullName()))
+                + ")");
+    assertThat(message.htmlBody())
+        .containsMatch(
+            "("
+                + Pattern.quote(String.format("%s and %s", user.fullName(), user2.fullName()))
+                + "|"
+                + Pattern.quote(String.format("%s and %s", user2.fullName(), user.fullName()))
+                + ")"
+                + Pattern.quote(" to <strong>review</strong> this change"));
+
+    // Ensure that a batch event has been sent:
+    // * 1 batch event for adding user and user2 as reviewers
+    assertThat(testReviewerAddedListener.receivedEvents).hasSize(1);
+    assertThat(testReviewerAddedListener.getReviewerIds()).containsExactly(user.id(), user2.id());
+  }
+
+  @Test
   public void deletingReviewers() throws Exception {
     PushOneCommit.Result r = createChange();
 
@@ -712,21 +771,25 @@
 
     sender.clear();
 
-    // remove user and user2
-    ReviewResult reviewResult =
-        gApi.changes()
-            .id(r.getChangeId())
-            .current()
-            .review(
-                ReviewInput.create()
-                    .reviewer(user.email(), ReviewerState.REMOVED, /* confirmed= */ true)
-                    .reviewer(user2.email(), ReviewerState.REMOVED, /* confirmed= */ true));
+    TestReviewerDeletedListener testReviewerDeletedListener = new TestReviewerDeletedListener();
+    try (Registration registration =
+        extensionRegistry.newRegistration().add(testReviewerDeletedListener)) {
+      // remove user and user2
+      ReviewResult reviewResult =
+          gApi.changes()
+              .id(r.getChangeId())
+              .current()
+              .review(
+                  ReviewInput.create()
+                      .reviewer(user.email(), ReviewerState.REMOVED, /* confirmed= */ true)
+                      .reviewer(user2.email(), ReviewerState.REMOVED, /* confirmed= */ true));
 
-    assertThat(
-            reviewResult.reviewers.values().stream()
-                .map(a -> a.removed.name)
-                .collect(toImmutableSet()))
-        .containsExactly(user.fullName(), user2.fullName());
+      assertThat(
+              reviewResult.reviewers.values().stream()
+                  .map(a -> a.removed.name)
+                  .collect(toImmutableSet()))
+          .containsExactly(user.fullName(), user2.fullName());
+    }
 
     assertThat(gApi.changes().id(r.getChangeId()).reviewers()).isEmpty();
 
@@ -748,6 +811,12 @@
                 + "|"
                 + Pattern.quote(String.format("%s and %s", user2.fullName(), user.fullName()))
                 + ")");
+
+    // Ensure that events have been sent:
+    // * 2 events for removing user and user2 as reviewers (one event per removed reviewer, batch
+    //   event not available for reviewer removal)
+    assertThat(testReviewerDeletedListener.receivedEvents).hasSize(2);
+    assertThat(testReviewerDeletedListener.getReviewerIds()).containsExactly(user.id(), user2.id());
   }
 
   @Test
@@ -766,30 +835,38 @@
 
     sender.clear();
 
-    // remove user and user2 while adding user3 and user4
-    ReviewResult reviewResult =
-        gApi.changes()
-            .id(r.getChangeId())
-            .current()
-            .review(
-                ReviewInput.create()
-                    .reviewer(user.email(), ReviewerState.REMOVED, /* confirmed= */ true)
-                    .reviewer(user2.email(), ReviewerState.REMOVED, /* confirmed= */ true)
-                    .reviewer(user3.email())
-                    .reviewer(user4.email()));
+    TestReviewerAddedListener testReviewerAddedListener = new TestReviewerAddedListener();
+    TestReviewerDeletedListener testReviewerDeletedListener = new TestReviewerDeletedListener();
+    try (Registration registration =
+        extensionRegistry
+            .newRegistration()
+            .add(testReviewerAddedListener)
+            .add(testReviewerDeletedListener)) {
+      // remove user and user2 while adding user3 and user4
+      ReviewResult reviewResult =
+          gApi.changes()
+              .id(r.getChangeId())
+              .current()
+              .review(
+                  ReviewInput.create()
+                      .reviewer(user.email(), ReviewerState.REMOVED, /* confirmed= */ true)
+                      .reviewer(user2.email(), ReviewerState.REMOVED, /* confirmed= */ true)
+                      .reviewer(user3.email())
+                      .reviewer(user4.email()));
 
-    assertThat(
-            reviewResult.reviewers.values().stream()
-                .filter(a -> a.removed != null)
-                .map(a -> a.removed.name)
-                .collect(toImmutableSet()))
-        .containsExactly(user.fullName(), user2.fullName());
-    assertThat(
-            reviewResult.reviewers.values().stream()
-                .filter(a -> a.reviewers != null)
-                .map(a -> Iterables.getOnlyElement(a.reviewers).name)
-                .collect(toImmutableSet()))
-        .containsExactly(user3.fullName(), user4.fullName());
+      assertThat(
+              reviewResult.reviewers.values().stream()
+                  .filter(a -> a.removed != null)
+                  .map(a -> a.removed.name)
+                  .collect(toImmutableSet()))
+          .containsExactly(user.fullName(), user2.fullName());
+      assertThat(
+              reviewResult.reviewers.values().stream()
+                  .filter(a -> a.reviewers != null)
+                  .map(a -> Iterables.getOnlyElement(a.reviewers).name)
+                  .collect(toImmutableSet()))
+          .containsExactly(user3.fullName(), user4.fullName());
+    }
 
     assertThat(
             gApi.changes().id(r.getChangeId()).reviewers().stream()
@@ -832,6 +909,15 @@
                 + "|"
                 + Pattern.quote(String.format("%s and %s", user2.fullName(), user.fullName()))
                 + ")");
+
+    // Ensure that events have been sent:
+    // * 1 batch event for adding user3 and user4 as reviewers
+    // * 2 events for removing user and user2 as reviewers (one event per removed reviewer, batch
+    //   event not available for reviewer removal)
+    assertThat(testReviewerAddedListener.receivedEvents).hasSize(1);
+    assertThat(testReviewerAddedListener.getReviewerIds()).containsExactly(user3.id(), user4.id());
+    assertThat(testReviewerDeletedListener.receivedEvents).hasSize(2);
+    assertThat(testReviewerDeletedListener.getReviewerIds()).containsExactly(user.id(), user2.id());
   }
 
   @Test
@@ -964,4 +1050,36 @@
       return Optional.empty();
     }
   }
+
+  private static class TestReviewerAddedListener implements ReviewerAddedListener {
+    List<ReviewerAddedListener.Event> receivedEvents = new ArrayList<>();
+
+    @Override
+    public void onReviewersAdded(ReviewerAddedListener.Event event) {
+      receivedEvents.add(event);
+    }
+
+    public ImmutableSet<Account.Id> getReviewerIds() {
+      return receivedEvents.stream()
+          .flatMap(e -> e.getReviewers().stream())
+          .map(accountInfo -> Account.id(accountInfo._accountId))
+          .collect(toImmutableSet());
+    }
+  }
+
+  private static class TestReviewerDeletedListener implements ReviewerDeletedListener {
+    List<ReviewerDeletedListener.Event> receivedEvents = new ArrayList<>();
+
+    @Override
+    public void onReviewerDeleted(ReviewerDeletedListener.Event event) {
+      receivedEvents.add(event);
+    }
+
+    public ImmutableSet<Account.Id> getReviewerIds() {
+      return receivedEvents.stream()
+          .map(ReviewerDeletedListener.Event::getReviewer)
+          .map(accountInfo -> Account.id(accountInfo._accountId))
+          .collect(toImmutableSet());
+    }
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/api/change/StickyApprovalsIT.java b/javatests/com/google/gerrit/acceptance/api/change/StickyApprovalsIT.java
index cd9e876..3888679 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/StickyApprovalsIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/StickyApprovalsIT.java
@@ -43,6 +43,7 @@
 import com.google.gerrit.acceptance.testsuite.change.ChangeOperations;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
 import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
+import com.google.gerrit.common.RawInputUtil;
 import com.google.gerrit.entities.Change;
 import com.google.gerrit.entities.LabelId;
 import com.google.gerrit.entities.LabelType;
@@ -557,6 +558,46 @@
   }
 
   @Test
+  public void
+      stickyWithCopyAllScoresIfListOfFilesDidNotChangeWhenFileIsModifiedDueToRebase_withoutCopyCondition()
+          throws Exception {
+    try (ProjectConfigUpdate u = updateProject(project)) {
+      u.getConfig()
+          .updateLabelType(
+              LabelId.CODE_REVIEW, b -> b.setCopyAllScoresIfListOfFilesDidNotChange(true));
+      u.save();
+    }
+    // Create two changes both with the same parent
+    PushOneCommit.Result r = createChange();
+    testRepo.reset("HEAD~1");
+    PushOneCommit.Result r2 = createChange();
+
+    // Modify f.txt in change 1. Approve and submit the first change
+    gApi.changes().id(r.getChangeId()).edit().modifyFile("f.txt", RawInputUtil.create("content"));
+    gApi.changes().id(r.getChangeId()).edit().publish();
+    RevisionApi revision = gApi.changes().id(r.getChangeId()).current();
+    revision.review(ReviewInput.approve().label(LabelId.VERIFIED, 1));
+    revision.submit();
+
+    // Add an approval whose score should be copied on change 2.
+    gApi.changes().id(r2.getChangeId()).current().review(ReviewInput.recommend());
+
+    // Rebase the second change. The rebase adds f1.txt.
+    gApi.changes().id(r2.getChangeId()).rebase();
+
+    // The code-review approval is copied for the second change between PS1 and PS2 since the only
+    // modified file is due to rebase.
+    List<PatchSetApproval> patchSetApprovals =
+        r2.getChange().notes().getApprovalsWithCopied().values().stream()
+            .sorted(comparing(a -> a.patchSetId().get()))
+            .collect(toImmutableList());
+    PatchSetApproval nonCopied = patchSetApprovals.get(0);
+    PatchSetApproval copied = patchSetApprovals.get(1);
+    assertCopied(nonCopied, /* psId= */ 1, LabelId.CODE_REVIEW, (short) 1, false);
+    assertCopied(copied, /* psId= */ 2, LabelId.CODE_REVIEW, (short) 1, true);
+  }
+
+  @Test
   public void stickyWithCopyAllScoresIfListOfFilesDidNotChangeWhenFileIsModified_withCopyCondition()
       throws Exception {
     try (ProjectConfigUpdate u = updateProject(project)) {
@@ -1072,17 +1113,9 @@
             .sorted(comparing(a -> a.patchSetId().get()))
             .collect(toImmutableList());
     PatchSetApproval nonCopied = patchSetApprovals.get(0);
-
-    assertThat(nonCopied.patchSetId().get()).isEqualTo(1);
-    assertThat(nonCopied.label()).isEqualTo(LabelId.CODE_REVIEW);
-    assertThat(nonCopied.value()).isEqualTo((short) 1);
-    assertThat(nonCopied.copied()).isFalse();
-
     PatchSetApproval copied = patchSetApprovals.get(1);
-    assertThat(copied.patchSetId().get()).isEqualTo(2);
-    assertThat(copied.label()).isEqualTo(LabelId.CODE_REVIEW);
-    assertThat(copied.value()).isEqualTo((short) 1);
-    assertThat(copied.copied()).isTrue();
+    assertCopied(nonCopied, 1, LabelId.CODE_REVIEW, (short) 1, /* copied= */ false);
+    assertCopied(copied, 2, LabelId.CODE_REVIEW, (short) 1, /* copied= */ true);
   }
 
   @Test
@@ -1311,4 +1344,12 @@
     }
     assertWithMessage(name).that(vote).isEqualTo(expectedVote);
   }
+
+  private void assertCopied(
+      PatchSetApproval approval, int psId, String label, short value, boolean copied) {
+    assertThat(approval.patchSetId().get()).isEqualTo(psId);
+    assertThat(approval.label()).isEqualTo(label);
+    assertThat(approval.value()).isEqualTo(value);
+    assertThat(approval.copied()).isEqualTo(copied);
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/server/change/GetRelatedIT.java b/javatests/com/google/gerrit/acceptance/server/change/GetRelatedIT.java
index 74dfa04..e778a5c 100644
--- a/javatests/com/google/gerrit/acceptance/server/change/GetRelatedIT.java
+++ b/javatests/com/google/gerrit/acceptance/server/change/GetRelatedIT.java
@@ -45,9 +45,9 @@
 import com.google.gerrit.extensions.common.CommitInfo;
 import com.google.gerrit.extensions.common.EditInfo;
 import com.google.gerrit.index.IndexConfig;
+import com.google.gerrit.server.change.GetRelatedChangesUtil;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.restapi.change.ChangesCollection;
-import com.google.gerrit.server.restapi.change.GetRelated;
 import com.google.gerrit.server.update.BatchUpdate;
 import com.google.gerrit.server.update.BatchUpdateOp;
 import com.google.gerrit.server.update.ChangeContext;
@@ -573,7 +573,7 @@
 
     ChangeData cd = getChange(last);
     assertThat(cd.patchSets()).hasSize(n);
-    assertThat(GetRelated.getAllGroups(cd.notes(), psUtil)).hasSize(n);
+    assertThat(GetRelatedChangesUtil.getAllGroups(cd.notes().getPatchSets().values())).hasSize(n);
 
     assertRelated(cd.change().currentPatchSetId());
   }
diff --git a/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java b/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java
index 4352fe8..024e35e 100644
--- a/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java
+++ b/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java
@@ -58,6 +58,17 @@
   }
 
   @Test
+  public void getDiff_returnsOldAndNewChangeInfos() {
+    ChangeInfo oldChangeInfo = createChangeInfoWithTopic("topic");
+    ChangeInfo newChangeInfo = createChangeInfoWithTopic(oldChangeInfo.topic);
+
+    ChangeInfoDifference diff = ChangeInfoDiffer.getDifference(oldChangeInfo, newChangeInfo);
+
+    assertThat(diff.oldChangeInfo()).isEqualTo(oldChangeInfo);
+    assertThat(diff.newChangeInfo()).isEqualTo(newChangeInfo);
+  }
+
+  @Test
   public void getDiff_givenUnchangedTopic_returnsNullTopics() {
     ChangeInfo oldChangeInfo = createChangeInfoWithTopic("topic");
     ChangeInfo newChangeInfo = createChangeInfoWithTopic(oldChangeInfo.topic);
diff --git a/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java b/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
index 2ea1d7c..056c7dc 100644
--- a/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
+++ b/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
@@ -34,6 +34,7 @@
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.json.OutputFormat;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.ReviewerStatusUpdate;
 import com.google.gerrit.server.notedb.ChangeNoteUtil.AttentionStatusInNoteDb;
@@ -784,7 +785,7 @@
         .containsExactly(
             "@@ -6 +6 @@\n"
                 + "-Removed Verified+2 by Other Account <other@account.com>\n"
-                + "+Removed Verified+2 by Gerrit Account\n");
+                + "+Removed Verified+2\n");
     BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
     assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
     assertThat(secondRunResult.refsFailedToFix).isEmpty();
@@ -837,6 +838,118 @@
   }
 
   @Test
+  public void fixRemoveVoteChangeMessageWithNoFooterLabel_matchByEmail() throws Exception {
+    Change c = newChange();
+    ChangeUpdate approvalUpdate = newUpdate(c, changeOwner);
+    approvalUpdate.putApproval(VERIFIED, (short) +2);
+
+    approvalUpdate.putApprovalFor(otherUserId, VERIFIED, (short) -1);
+    approvalUpdate.commit();
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(
+            c, /*changeMessage=*/ "Removed Verified+2 by Renamed Change Owner <change@owner.com>"),
+        getAuthorIdent(changeOwner.getAccount()));
+
+    RunOptions options = new RunOptions();
+    options.dryRun = false;
+    BackfillResult result = rewriter.backfillProject(project, repo, options);
+    assertThat(result.fixedRefDiff.keySet()).containsExactly(RefNames.changeMetaRef(c.getId()));
+
+    List<String> commitHistoryDiff = commitHistoryDiff(result, c.getId());
+    assertThat(commitHistoryDiff)
+        .containsExactly(
+            "@@ -6 +6 @@\n"
+                + "-Removed Verified+2 by Renamed Change Owner <change@owner.com>\n"
+                + "+Removed Verified+2 by <GERRIT_ACCOUNT_1>\n");
+    BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
+    assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
+    assertThat(secondRunResult.refsFailedToFix).isEmpty();
+  }
+
+  @Test
+  public void fixRemoveVoteChangeMessageWithNoFooterLabel_matchByName() throws Exception {
+    Change c = newChange();
+    ChangeUpdate approvalUpdate = newUpdate(c, changeOwner);
+    approvalUpdate.putApproval(VERIFIED, (short) +2);
+
+    approvalUpdate.putApprovalFor(otherUserId, VERIFIED, (short) -1);
+    approvalUpdate.commit();
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(c, /*changeMessage=*/ "Removed Verified+2 by Change Owner"),
+        getAuthorIdent(changeOwner.getAccount()));
+
+    RunOptions options = new RunOptions();
+    options.dryRun = false;
+    BackfillResult result = rewriter.backfillProject(project, repo, options);
+    assertThat(result.fixedRefDiff.keySet()).containsExactly(RefNames.changeMetaRef(c.getId()));
+
+    List<String> commitHistoryDiff = commitHistoryDiff(result, c.getId());
+    assertThat(commitHistoryDiff)
+        .containsExactly(
+            "@@ -6 +6 @@\n"
+                + "-Removed Verified+2 by Change Owner\n"
+                + "+Removed Verified+2 by <GERRIT_ACCOUNT_1>\n");
+    BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
+    assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
+    assertThat(secondRunResult.refsFailedToFix).isEmpty();
+  }
+
+  @Test
+  public void fixRemoveVoteChangeMessageWithNoFooterLabel_matchDuplicateAccounts()
+      throws Exception {
+    Account duplicateCodeOwner =
+        Account.builder(Account.id(4), TimeUtil.nowTs())
+            .setFullName(changeOwner.getName())
+            .setPreferredEmail("other@test.com")
+            .build();
+    accountCache.put(duplicateCodeOwner);
+    Change c = newChange();
+    ChangeUpdate approvalUpdate = newUpdate(c, changeOwner);
+    approvalUpdate.putApproval(VERIFIED, (short) +2);
+
+    approvalUpdate.putApprovalFor(duplicateCodeOwner.id(), VERIFIED, (short) -1);
+    approvalUpdate.commit();
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(
+            c, /*changeMessage=*/ "Removed Verified+2 by Change Owner <other@test.com>"),
+        getAuthorIdent(changeOwner.getAccount()));
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(
+            c, /*changeMessage=*/ "Removed Verified+2 by Change Owner <change@owner.com>"),
+        getAuthorIdent(changeOwner.getAccount()));
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(
+            c, /*changeMessage=*/ "Removed Verified-1 by Change Owner <other@test.com>"),
+        getAuthorIdent(changeOwner.getAccount()));
+
+    RunOptions options = new RunOptions();
+    options.dryRun = false;
+    BackfillResult result = rewriter.backfillProject(project, repo, options);
+    assertThat(result.fixedRefDiff.keySet()).containsExactly(RefNames.changeMetaRef(c.getId()));
+
+    List<String> commitHistoryDiff = commitHistoryDiff(result, c.getId());
+    assertThat(commitHistoryDiff)
+        .containsExactly(
+            "@@ -6 +6 @@\n"
+                + "-Removed Verified+2 by Change Owner <other@test.com>\n"
+                + "+Removed Verified+2 by <GERRIT_ACCOUNT_4>\n",
+            "@@ -6 +6 @@\n"
+                + "-Removed Verified+2 by Change Owner <change@owner.com>\n"
+                + "+Removed Verified+2 by <GERRIT_ACCOUNT_1>\n",
+            "@@ -6 +6 @@\n"
+                + "-Removed Verified-1 by Change Owner <other@test.com>\n"
+                + "+Removed Verified-1 by <GERRIT_ACCOUNT_4>\n");
+    BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
+    assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
+    assertThat(secondRunResult.refsFailedToFix).isEmpty();
+  }
+
+  @Test
   public void fixRemoveVotesChangeMessage() throws Exception {
     Change c = newChange();
     ChangeUpdate approvalUpdate = newUpdate(c, changeOwner);
@@ -1491,19 +1604,20 @@
     accountCache.put(duplicateReviewer);
     Change c = newChange();
     ImmutableList.Builder<ObjectId> commitsToFix = new ImmutableList.Builder<>();
-    ChangeUpdate addReviewerUpdate = newUpdate(c, changeOwner);
+    ChangeUpdate addReviewerUpdate = newCodeOwnerAddReviewerUpdate(c, changeOwner);
     addReviewerUpdate.putReviewer(reviewer.id(), REVIEWER);
     addReviewerUpdate.commit();
-    ChangeUpdate invalidOnAddReviewerUpdate = newUpdate(c, changeOwner);
+    ChangeUpdate invalidOnAddReviewerUpdate = newCodeOwnerAddReviewerUpdate(c, changeOwner);
     invalidOnAddReviewerUpdate.setChangeMessage(
         "Reviewer User who was added as reviewer owns the following files:\n"
             + "   * file1.java\n"
             + "   * file2.ts\n");
     commitsToFix.add(invalidOnAddReviewerUpdate.commit());
-    ChangeUpdate addOtherReviewerUpdate = newUpdate(c, changeOwner);
+    ChangeUpdate addOtherReviewerUpdate = newCodeOwnerAddReviewerUpdate(c, changeOwner);
     addOtherReviewerUpdate.putReviewer(otherUserId, REVIEWER);
     addOtherReviewerUpdate.commit();
-    ChangeUpdate invalidOnAddReviewerMultipleReviewerUpdate = newUpdate(c, changeOwner);
+    ChangeUpdate invalidOnAddReviewerMultipleReviewerUpdate =
+        newCodeOwnerAddReviewerUpdate(c, changeOwner);
     invalidOnAddReviewerMultipleReviewerUpdate.setChangeMessage(
         "Reviewer User who was added as reviewer owns the following files:\n"
             + "   * file1.java\n"
@@ -1512,17 +1626,17 @@
             + "\nMissing Reviewer who was added as reviewer owns the following files:\n"
             + "   * file4.java\n");
     commitsToFix.add(invalidOnAddReviewerMultipleReviewerUpdate.commit());
-    ChangeUpdate addDuplicateReviewerUpdate = newUpdate(c, changeOwner);
+    ChangeUpdate addDuplicateReviewerUpdate = newCodeOwnerAddReviewerUpdate(c, changeOwner);
     addDuplicateReviewerUpdate.putReviewer(duplicateReviewer.id(), REVIEWER);
     addDuplicateReviewerUpdate.commit();
     // Reviewer name resolves to multiple accounts in the same change
-    ChangeUpdate onAddReviewerUpdateWithDuplicate = newUpdate(c, changeOwner);
+    ChangeUpdate onAddReviewerUpdateWithDuplicate = newCodeOwnerAddReviewerUpdate(c, changeOwner);
     onAddReviewerUpdateWithDuplicate.setChangeMessage(
         "Reviewer User who was added as reviewer owns the following files:\n"
             + "   * file6.java\n");
     commitsToFix.add(onAddReviewerUpdateWithDuplicate.commit());
 
-    ChangeUpdate validOnAddReviewerUpdate = newUpdate(c, changeOwner);
+    ChangeUpdate validOnAddReviewerUpdate = newCodeOwnerAddReviewerUpdate(c, changeOwner);
     validOnAddReviewerUpdate.setChangeMessage(
         "Gerrit Account who was added as reviewer owns the following files:\n"
             + "   * file1.java\n"
@@ -1557,10 +1671,9 @@
                 + "   * file1.java\n"
                 + "\n<GERRIT_ACCOUNT_2>, who was added as reviewer owns the following files:\n"
                 + "   * file3.js\n"
-                + "\nGerrit Account, who was added as reviewer owns the following files:\n"
+                + "\nAdded reviewer owns the following files:\n"
                 + "   * file4.java\n",
-            "Gerrit Account, who was added as reviewer owns the following files:\n"
-                + "   * file6.java\n",
+            "Added reviewer owns the following files:\n" + "   * file6.java\n",
             "Gerrit Account who was added as reviewer owns the following files:\n"
                 + "   * file1.java\n"
                 + "\n<GERRIT_ACCOUNT_1> who was added as reviewer owns the following files:\n"
@@ -1587,10 +1700,10 @@
                 + "+<GERRIT_ACCOUNT_2>, who was added as reviewer owns the following files:\n"
                 + "@@ -12 +12 @@\n"
                 + "-Missing Reviewer who was added as reviewer owns the following files:\n"
-                + "+Gerrit Account, who was added as reviewer owns the following files:\n",
+                + "+Added reviewer owns the following files:\n",
             "@@ -6 +6 @@\n"
                 + "-Reviewer User who was added as reviewer owns the following files:\n"
-                + "+Gerrit Account, who was added as reviewer owns the following files:\n");
+                + "+Added reviewer owns the following files:\n");
     BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
     assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
     assertThat(secondRunResult.refsFailedToFix).isEmpty();
@@ -1937,7 +2050,8 @@
         getChangeUpdateBody(
             c,
             String.format(
-                "Assignee changed from: %s to: %s", changeOwner.getName(), otherUser.getName())),
+                "Assignee changed from: %s to: %s",
+                changeOwner.getNameEmail(), otherUser.getNameEmail())),
         getAuthorIdent(otherUser.getAccount()));
     writeUpdate(
         RefNames.changeMetaRef(c.getId()),
@@ -1972,14 +2086,12 @@
                 + "-Assignee added: Change Owner\n"
                 + "+Assignee added: <GERRIT_ACCOUNT_1>\n",
             "@@ -6 +6 @@\n"
-                + "-Assignee changed from: Change Owner to: Other Account\n"
+                + "-Assignee changed from: Change Owner <change@owner.com> to: Other Account <other@account.com>\n"
                 + "+Assignee changed from: <GERRIT_ACCOUNT_1> to: <GERRIT_ACCOUNT_2>\n",
             "@@ -6 +6 @@\n"
                 + "-Assignee deleted: Other Account\n"
                 + "+Assignee deleted: <GERRIT_ACCOUNT_2>\n",
-            "@@ -6 +6 @@\n"
-                + "-Assignee added: Reviewer User\n"
-                + "+Assignee added: Gerrit Account\n");
+            "@@ -6 +6 @@\n" + "-Assignee added: Reviewer User\n" + "+Assignee was added.\n");
     BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
     assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
     assertThat(secondRunResult.refsFailedToFix).isEmpty();
@@ -2137,6 +2249,13 @@
         .collect(toImmutableList());
   }
 
+  protected ChangeUpdate newCodeOwnerAddReviewerUpdate(Change c, CurrentUser user)
+      throws Exception {
+    ChangeUpdate update = newUpdate(c, user, true);
+    update.setTag("autogenerated:gerrit:code-owners:addReviewer");
+    return update;
+  }
+
   private ImmutableList<String> commitHistoryDiff(BackfillResult result, Change.Id changeId) {
     return result.fixedRefDiff.get(RefNames.changeMetaRef(changeId)).stream()
         .map(CommitDiff::diff)
diff --git a/javatests/com/google/gerrit/server/patch/PatchListTest.java b/javatests/com/google/gerrit/server/patch/PatchListTest.java
deleted file mode 100644
index 182ce49..0000000
--- a/javatests/com/google/gerrit/server/patch/PatchListTest.java
+++ /dev/null
@@ -1,97 +0,0 @@
-// Copyright (C) 2017 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.server.patch;
-
-import static com.google.common.truth.Truth.assertThat;
-
-import com.google.gerrit.entities.Patch;
-import com.google.gerrit.entities.Patch.ChangeType;
-import com.google.gerrit.server.patch.PatchList.ChangeTypeCmp;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.util.Arrays;
-import java.util.List;
-import org.junit.Test;
-
-public class PatchListTest {
-
-  @Test
-  public void fileOrder() {
-    String[] names = {
-      "zzz",
-      "def/g",
-      "/!xxx",
-      "abc",
-      Patch.MERGE_LIST,
-      "qrx",
-      Patch.COMMIT_MSG,
-      Patch.PATCHSET_LEVEL
-    };
-    String[] want = {
-      Patch.COMMIT_MSG,
-      Patch.MERGE_LIST,
-      Patch.PATCHSET_LEVEL,
-      "/!xxx",
-      "abc",
-      "def/g",
-      "qrx",
-      "zzz",
-    };
-    Arrays.sort(names, 0, names.length, PatchList.FILE_PATH_CMP);
-    assertThat(names).isEqualTo(want);
-  }
-
-  @Test
-  public void fileOrderNoMerge() {
-    String[] names = {
-      "zzz", "def/g", "/!xxx", "abc", "qrx", Patch.COMMIT_MSG,
-    };
-    String[] want = {
-      Patch.COMMIT_MSG, "/!xxx", "abc", "def/g", "qrx", "zzz",
-    };
-
-    Arrays.sort(names, 0, names.length, PatchList.FILE_PATH_CMP);
-    assertThat(names).isEqualTo(want);
-  }
-
-  @Test
-  public void changeTypeOrderIsComplete() {
-    List<ChangeType> changeTypeOrder = ChangeTypeCmp.order;
-    ChangeType[] allTypes = ChangeType.values();
-
-    Arrays.sort(allTypes, PatchList.CHANGE_TYPE_CMP);
-    assertThat(changeTypeOrder).containsExactlyElementsIn(allTypes).inOrder();
-  }
-
-  @Test
-  public void largeObjectTombstoneCanBeSerializedAndDeserialized() throws Exception {
-    // Serialize
-    byte[] serializedObject;
-    try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        ObjectOutputStream objectStream = new ObjectOutputStream(baos)) {
-      objectStream.writeObject(new PatchListCacheImpl.LargeObjectTombstone());
-      serializedObject = baos.toByteArray();
-      assertThat(serializedObject).isNotNull();
-    }
-    // Deserialize
-    try (InputStream is = new ByteArrayInputStream(serializedObject);
-        ObjectInputStream ois = new ObjectInputStream(is)) {
-      assertThat(ois.readObject()).isInstanceOf(PatchListCacheImpl.LargeObjectTombstone.class);
-    }
-  }
-}
diff --git a/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java b/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
index c8949e6..9ebee9c 100644
--- a/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
+++ b/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
@@ -3698,18 +3698,16 @@
 
     TestRepository<Repo> repo = createProject("repo");
     Change change = insert(repo, newChange(repo));
-    AssigneeInput ain = new AssigneeInput();
-    ain.assignee = user2.toString();
-    gApi.changes().id(change.getId().get()).setAssignee(ain);
+    gApi.changes().id(change.getId().get()).addReviewer(user2.toString());
 
     RequestContext adminContext = requestContext.setContext(newRequestContext(user2));
-    assertQuery("assignee:self", change);
+    assertQuery("reviewer:self", change);
 
     requestContext.setContext(adminContext);
     gApi.accounts().id(user2.get()).setActive(false);
 
     requestContext.setContext(newRequestContext(user2));
-    assertQuery("assignee:self", change);
+    assertQuery("reviewer:self", change);
   }
 
   @Test
diff --git a/package.json b/package.json
index c3dfad0..a492055 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
     "@bazel/rollup": "^3.5.0",
     "@bazel/terser": "^3.5.0",
     "@bazel/typescript": "^3.5.0",
-    "twinkie": "^1.1.2"
+    "twinkie": "^1.1.3"
   },
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^4.29.0",
@@ -15,12 +15,16 @@
     "eslint-plugin-html": "^6.1.2",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jsdoc": "^32.3.0",
+    "eslint-plugin-lit": "^1.5.1",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.4.0",
+    "eslint-plugin-regex": "^1.8.0",
     "gts": "^3.1.0",
+    "lit-analyzer": "^1.2.1",
     "prettier": "2.3.1",
     "rollup": "^2.45.2",
     "terser": "^5.6.1",
+    "ts-lit-plugin": "^1.2.1",
     "typescript": "4.3.2"
   },
   "scripts": {
@@ -32,19 +36,19 @@
     "safe_bazelisk": "if which bazelisk >/dev/null; then bazel_bin=bazelisk; else bazel_bin=bazel; fi && $bazel_bin",
     "eslint": "npm run safe_bazelisk test polygerrit-ui/app:lint_test",
     "eslintfix": "npm run safe_bazelisk run polygerrit-ui/app:lint_bin -- -- --fix $(pwd)/polygerrit-ui/app",
-    "polylint": "npm run safe_bazelisk test polygerrit-ui/app:polylint_test",
+    "litlint": "npm run safe_bazelisk run polygerrit-ui/app:lit_analysis",
     "test:debug": "npm run compile:local && npm run safe_bazelisk run //polygerrit-ui:karma_bin -- -- start $(pwd)/polygerrit-ui/karma.conf.js --root '.ts-out/polygerrit-ui/app/' --browsers ChromeDev --no-single-run --test-files",
     "test:single": "npm run compile:local && npm run safe_bazelisk run //polygerrit-ui:karma_bin -- -- start $(pwd)/polygerrit-ui/karma.conf.js --root '.ts-out/polygerrit-ui/app/' --test-files",
-    "postinstall": "(git apply --reverse --ignore-whitespace twinkie.patch || true) && git apply --ignore-whitespace twinkie.patch",
-    "polytest": "npm run safe_bazelisk test //polygerrit-ui/app:validate_polymer_templates",
-    "polytest:dev": "rm -rf ./polygerrit-ui/app/tmpl_out && npm run safe_bazelisk build //polygerrit-ui/app:template_test_tar && mkdir ./polygerrit-ui/app/tmpl_out && tar -xf bazel-bin/polygerrit-ui/app/template_test_tar.tar -C ./polygerrit-ui/app/tmpl_out"
+    "polylint": "npm run safe_bazelisk test //polygerrit-ui/app:polylint_test",
+    "polylint:dev": "rm -rf ./polygerrit-ui/app/tmpl_out && npm run safe_bazelisk build //polygerrit-ui/app:template_test_tar && mkdir ./polygerrit-ui/app/tmpl_out && tar -xf bazel-bin/polygerrit-ui/app/template_test_tar.tar -C ./polygerrit-ui/app/tmpl_out"
   },
   "repository": {
     "type": "git",
     "url": "https://gerrit.googlesource.com/gerrit"
   },
   "resolutions": {
-    "lodash": "4.17.21"
+    "lodash": "4.17.21",
+    "twinkie/typescript": "4.3.2"
   },
   "author": "",
   "license": "Apache-2.0"
diff --git a/plugins/BUILD b/plugins/BUILD
index 01ede06..0e5df2c 100644
--- a/plugins/BUILD
+++ b/plugins/BUILD
@@ -73,6 +73,7 @@
     "//lib/commons:compress",
     "//lib/commons:dbcp",
     "//lib/commons:lang",
+    "//lib/commons:lang3",
     "//lib/dropwizard:dropwizard-core",
     "//lib/flogger:api",
     "//lib/guice:guice",
diff --git a/plugins/delete-project b/plugins/delete-project
index 0b5bcbf..8fe544a 160000
--- a/plugins/delete-project
+++ b/plugins/delete-project
@@ -1 +1 @@
-Subproject commit 0b5bcbfc26d9c0559312ced40bb36a37f517b793
+Subproject commit 8fe544ac569efa357ee054257143d8e1d4aa6afd
diff --git a/plugins/plugin-manager b/plugins/plugin-manager
index 5b87f63..44808dc 160000
--- a/plugins/plugin-manager
+++ b/plugins/plugin-manager
@@ -1 +1 @@
-Subproject commit 5b87f63f3e9c5817bcddf008c0b4005494059368
+Subproject commit 44808dcad3c978ed12bb2cb454c6ad320912aa8a
diff --git a/plugins/tsconfig-plugins-base.json b/plugins/tsconfig-plugins-base.json
index 97eae67..b7e9d52 100644
--- a/plugins/tsconfig-plugins-base.json
+++ b/plugins/tsconfig-plugins-base.json
@@ -20,6 +20,7 @@
     "noUnusedLocals": true, /* Report errors on unused locals. */
     "noUnusedParameters": true, /* Report errors on unused parameters. */
     "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
+    "noImplicitOverride": true,
     "noFallthroughCasesInSwitch": true,/* Report errors for fallthrough cases in switch statement. */
 
     "skipLibCheck": true, /* Do not check node_modules */
diff --git a/polygerrit-ui/app/.eslintrc.js b/polygerrit-ui/app/.eslintrc.js
index faf126c..14f9e8c 100644
--- a/polygerrit-ui/app/.eslintrc.js
+++ b/polygerrit-ui/app/.eslintrc.js
@@ -277,6 +277,18 @@
       },
     },
     {
+      files: ['**/api/*.ts'],
+      rules: {
+        'regex/invalid': [
+          'error', [{
+            regex: 'export interface',
+            message: 'All interfaces in the api/ dir must have "declare"',
+            replacement: 'export declare interface',
+          }],
+        ],
+      },
+    },
+    {
       files: ['**/*.ts'],
       extends: [require.resolve('gts/.eslintrc.json')],
       rules: {
@@ -400,12 +412,32 @@
         }],
       },
     },
+    {
+      files: ['*.ts'],
+      excludedFiles: '*_html.ts',
+      rules: {
+        'lit/attribute-value-entities': 'error',
+        'lit/binding-positions': 'error',
+        'lit/no-duplicate-template-bindings': 'error',
+        'lit/no-invalid-html': 'error',
+        'lit/no-legacy-template-syntax': 'error',
+        'lit/no-property-change-update': 'error',
+        'lit/no-invalid-escape-sequences': 'error',
+        'lit/no-legacy-imports': 'error',
+        'lit/no-private-properties': 'error',
+        'lit/no-useless-template-literals': 'error',
+        'lit/no-value-attribute': 'error',
+        'lit/prefer-static-styles': 'error',
+      },
+    },
   ],
   plugins: [
     'html',
     'jsdoc',
     'import',
+    'lit',
     'prettier',
+    'regex',
   ],
   settings: {
     'html/report-bad-indent': 'error',
diff --git a/polygerrit-ui/app/BUILD b/polygerrit-ui/app/BUILD
index 613efd6..3a647d4 100644
--- a/polygerrit-ui/app/BUILD
+++ b/polygerrit-ui/app/BUILD
@@ -45,8 +45,6 @@
     ),
     allow_js = True,
     incremental = True,
-    # The same outdir also appears in the following files:
-    # polylint_test.sh
     out_dir = "_pg_ts_out",
     tsc = "//tools/node_tools:tsc-bin",
     tsconfig = ":ts_config_bazel",
@@ -96,9 +94,7 @@
 # so template tests pass.
 # TODO: fix problems reported by template checker in these files.
 ignore_templates_list = [
-    "elements/admin/gr-access-section/gr-access-section_html.ts",
     "elements/admin/gr-admin-view/gr-admin-view_html.ts",
-    "elements/admin/gr-create-change-dialog/gr-create-change-dialog_html.ts",
     "elements/admin/gr-create-repo-dialog/gr-create-repo-dialog_html.ts",
     "elements/admin/gr-group-members/gr-group-members_html.ts",
     "elements/admin/gr-group/gr-group_html.ts",
@@ -109,7 +105,6 @@
     "elements/admin/gr-repo-plugin-config/gr-repo-plugin-config_html.ts",
     "elements/admin/gr-repo/gr-repo_html.ts",
     "elements/admin/gr-rule-editor/gr-rule-editor_html.ts",
-    "elements/change-list/gr-change-list-item/gr-change-list-item_html.ts",
     "elements/change-list/gr-change-list-view/gr-change-list-view_html.ts",
     "elements/change-list/gr-change-list/gr-change-list_html.ts",
     "elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts",
@@ -117,9 +112,6 @@
     "elements/change/gr-change-metadata/gr-change-metadata_html.ts",
     "elements/change/gr-change-requirements/gr-change-requirements_html.ts",
     "elements/change/gr-change-view/gr-change-view_html.ts",
-    "elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_html.ts",
-    "elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts",
-    "elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_html.ts",
     "elements/change/gr-file-list-header/gr-file-list-header_html.ts",
     "elements/change/gr-file-list/gr-file-list_html.ts",
     "elements/change/gr-label-score-row/gr-label-score-row_html.ts",
@@ -137,25 +129,21 @@
     "elements/gr-app-element_html.ts",
     "elements/settings/gr-watched-projects-editor/gr-watched-projects-editor_html.ts",
     "elements/shared/gr-account-list/gr-account-list_html.ts",
-    "elements/shared/gr-comment-thread/gr-comment-thread_html.ts",
-    "elements/shared/gr-comment/gr-comment_html.ts",
-    "elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts",
-    "elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts",
-    "elements/shared/gr-label-info/gr-label-info_html.ts",
-    "elements/shared/gr-list-view/gr-list-view_html.ts",
 ]
 
+sources_for_template_checking = glob(
+    [src_dir + "/**/*" + ext for src_dir in src_dirs for ext in [
+        ".ts",
+    ]],
+    exclude = [
+        "**/*_test.ts",
+    ] + ignore_templates_list,
+)
+
 # Transform templates into a .ts files.
 templates_srcs = transform_polymer_templates(
     name = "template_test",
-    srcs = glob(
-        [src_dir + "/**/*" + ext for src_dir in src_dirs for ext in [
-            ".ts",
-        ]],
-        exclude = [
-            "**/*_test.ts",
-        ] + ignore_templates_list,
-    ),
+    srcs = sources_for_template_checking,
     out_tsconfig = "tsconfig_template_test.json",
     tsconfig = "tsconfig_bazel.json",
     deps = [
@@ -165,50 +153,34 @@
     ],
 )
 
-# Compile transformed templates together with the polygerrit source. If
-# templates don't have problem, then the compilation ends without error.
-# Otherwise, the typescript compiler reports the error.
-# Note, that the compile_ts macro creates build rules. If the build succeed,
-# the macro creates the file compile_template_test.success. The
-# 'validate_polymer_templates' rule tests existence of the file.
-#
-# TODO: Re-instantiate this rule. It broke when switching to ts_project with
-# ERROR: //polygerrit-ui/app:compile_template_test srcs cannot be a mix of
-#        generated files and source files since this would prevent giving a
-#        single rootDir to the TypeScript compiler
-# Also, the emitJS feature of compile_ts has to be re-created in some form.
-#ts_project(
-#    name = "compile_template_test",
-#    srcs = templates_srcs + glob(
-#        [src_dir + "/**/*" + ext for src_dir in src_dirs for ext in [
-#            ".ts",
-#        ]],
-#        exclude = [
-#            "**/*_test.ts",
-#        ] + ignore_templates_list,
-#    ),
-#    allow_js = True,
-#    out_dir = "_pg_template_test_out",
-#    # Should not run sandboxed.
-#    tags = [
-#        "local",
-#        "manual",
-#    ],
-#    tsc = "//tools/node_tools:tsc-bin",
-#    tsconfig = "tsconfig_template_test.json",
-#)
-#
-# This rule allows to run polymer template checker with bazel test command.
-# For details - see compile_template_test rule.
-#
-# TODO: Re-instantiate this test. It broke when switching
-#       'compile_template_test'to ts_project, see above. ts_project does not
-#       create '.success' files.
-#sh_test(
-#    name = "validate_polymer_templates",
-#    srcs = [":empty_test.sh"],
-#    data = ["compile_template_test.success"],
-#)
+# After templates are converted into a typescript code, the TS compiler should check that the
+# converted code doesn't have the error (i.e. templates don't have problems).
+# The input to the compiler is: the converted (i.e. autogenerated) code + original polygerrit code;
+# the output (i.e. js code) is not needed (we only care wheather the code has error or not).
+# The existing ts_project rule can't compile a mix of a generated and a non-generated code, so it
+# can't be used for the purpose of template checking.
+# Because the output of TS compiler is not needed, the simplest workaround is to run typescript
+# compiler from command line using the sh_test rule. The compiler exits with non-zero return code if
+# errors found and sh_test fails.
+sh_test(
+    name = "polylint_test",
+    srcs = [":compile_generated_templates.sh"],
+    args = [
+        "$(location //tools/node_tools:tsc-bin)",
+        "$(location tsconfig_template_test.json)",
+    ],
+    data = [
+        "tsconfig_template_test.json",
+        "tsconfig_bazel.json",
+        "tsconfig.json",
+        "//tools/node_tools:tsc-bin",
+        "@ui_npm//:node_modules",
+    ] + templates_srcs + sources_for_template_checking,
+    tags = [
+        "local",
+        "manual",
+    ],
+)
 
 polygerrit_bundle(
     name = "polygerrit_ui",
@@ -292,31 +264,30 @@
 )
 
 filegroup(
-    name = "polylint-fg",
-    srcs = [
-        # Workaround for https://github.com/bazelbuild/bazel/issues/1305
+    name = "lit_analysis_src_code",
+    srcs = glob(
+        ["**/*.ts"],
+        exclude = [
+            "**/*_html.ts",
+            "**/*_test.ts",
+        ],
+    ) + [
+        "@ui_dev_npm//:node_modules",
         "@ui_npm//:node_modules",
-        # Polylinter can't check .ts files, run it on compiled srcs
-        ":compile_pg",
     ],
 )
 
-sh_test(
-    name = "polylint_test",
-    size = "large",
-    srcs = ["polylint_test.sh"],
-    args = [
-        "$(location @tools_npm//polymer-cli/bin:polymer)",
-        "$(location polymer.json)",
-    ],
+nodejs_binary(
+    name = "lit_analysis",
     data = [
-        "polymer.json",
-        ":polylint-fg",
-        "@tools_npm//polymer-cli/bin:polymer",
+        ":lit_analysis_src_code",
+        "@npm//lit-analyzer",
     ],
-    # Should not run sandboxed.
-    tags = [
-        "local",
-        "manual",
+    entry_point = "@npm//:node_modules/lit-analyzer/cli.js",
+    templated_args = [
+        "**/elements/**/*.ts",
+        "--strict",
+        "--rules.no-property-visibility-mismatch off",
+        "--rules.no-incompatible-property-type off",
     ],
 )
diff --git a/polygerrit-ui/app/api/diff.ts b/polygerrit-ui/app/api/diff.ts
index 1453fd0..ee579ff 100644
--- a/polygerrit-ui/app/api/diff.ts
+++ b/polygerrit-ui/app/api/diff.ts
@@ -53,30 +53,30 @@
 }
 
 /**
+ * Represents a "generic" text range in the code (e.g. text selection)
+ */
+interface TextRange {
+  /** first line of the range (1-based inclusive). */
+  start_line: number;
+  /** first column of the range (in the first line) (1-based inclusive). */
+  start_column: number;
+  /** last line of the range (1-based inclusive). */
+  end_line: number;
+  /** last column of the range (in the end line) (1-based inclusive). */
+  end_column: number;
+}
+
+/**
  * Represents a syntax block in a code (e.g. method, function, class, if-else).
  */
 export declare interface SyntaxBlock {
   /** Name of the block (e.g. name of the method/class)*/
   name: string;
-  /** Where does this block syntatically starts and ends (line number and column).*/
-  range: {
-    /** first line of the block (1-based inclusive). */
-    start_line: number;
-    /**
-     * column of the range start inside the first line (e.g. "{" character ending a function/method)
-     * (1-based inclusive).
-     */
-    start_column: number;
-    /**
-     * last line of the block (1-based inclusive).
-     */
-    end_line: number;
-    /**
-     * column of the block end inside the end line (e.g. "}" character ending a function/method)
-     * (1-based inclusive).
-     */
-    end_column: number;
-  };
+  /**
+   * Where does this block syntatically starts and ends (line number and
+   * column).
+   */
+  range: TextRange;
   /** Sub-blocks of the current syntax block (e.g. methods of a class) */
   children: SyntaxBlock[];
 }
@@ -210,15 +210,22 @@
 }
 
 /**
- * Listens to changes in token highlighting - when a new token starts or stopped being highlighted.
- * Examples:
- * - Token highlighted: ('myFunctionName', 12, [Element]).
- * - Token unhighlighted: (undefined, 0, undefined).
+ * Event details when a token is highlighted.
  */
-export type TokenHighlightedListener = (
-  newHighlight: string | undefined,
-  newLineNumber: number,
-  hoveredElement?: Element
+export declare interface TokenHighlightEventDetails {
+  token: string;
+  element: Element;
+  side: Side;
+  range: TextRange;
+}
+
+/**
+ * Listens to changes in token highlighting - when a new token starts or stopped
+ * being highlighted. undefined is sent if the event is about a clear in
+ * highlighting.
+ */
+export type TokenHighlightListener = (
+  tokenHighlightEvent?: TokenHighlightEventDetails
 ) => void;
 
 export declare interface ImageDiffPreferences {
diff --git a/polygerrit-ui/app/api/embed.ts b/polygerrit-ui/app/api/embed.ts
index fed724e..520aeec 100644
--- a/polygerrit-ui/app/api/embed.ts
+++ b/polygerrit-ui/app/api/embed.ts
@@ -24,7 +24,7 @@
   DiffLayer,
   GrAnnotation,
   GrDiffCursor,
-  TokenHighlightedListener,
+  TokenHighlightListener,
 } from './diff';
 
 declare global {
@@ -35,7 +35,7 @@
       TokenHighlightLayer: {
         new (
           container?: HTMLElement,
-          listener?: TokenHighlightedListener
+          listener?: TokenHighlightListener
         ): DiffLayer;
       };
     };
diff --git a/polygerrit-ui/app/api/gerrit.ts b/polygerrit-ui/app/api/gerrit.ts
index 8488961..2091eea 100644
--- a/polygerrit-ui/app/api/gerrit.ts
+++ b/polygerrit-ui/app/api/gerrit.ts
@@ -25,7 +25,7 @@
   }
 }
 
-export interface Gerrit {
+export declare interface Gerrit {
   install(
     callback: (plugin: PluginApi) => void,
     opt_version?: string,
diff --git a/polygerrit-ui/app/api/hook.ts b/polygerrit-ui/app/api/hook.ts
index f8a6cc1..8cbb9d0 100644
--- a/polygerrit-ui/app/api/hook.ts
+++ b/polygerrit-ui/app/api/hook.ts
@@ -16,7 +16,7 @@
  */
 import {ChangeInfo, ConfigInfo, RevisionInfo} from './rest-api';
 
-export interface GerritElementExtensions {
+export declare interface GerritElementExtensions {
   content?: HTMLElement & {hidden?: boolean};
   change?: ChangeInfo;
   revision?: RevisionInfo;
diff --git a/polygerrit-ui/app/api/popup.ts b/polygerrit-ui/app/api/popup.ts
index 8d81831..d265ee6 100644
--- a/polygerrit-ui/app/api/popup.ts
+++ b/polygerrit-ui/app/api/popup.ts
@@ -17,9 +17,10 @@
 
 export declare interface PopupPluginApi {
   /**
-   * Opens the popup, inserts it into DOM over current UI.
-   * Creates the popup if not previously created. Creates popup content element,
-   * if it was provided with constructor.
+   * Opens the popup, inserts it into the DOM over current UI.
+   * Creates the popup if not previously created. Creates and inserts the popup
+   * content element, if a `moduleName` was provided in the constructor.
+   * Otherwise you have to call `appendContent()` when the promise resolves.
    */
   open(): Promise<PopupPluginApi>;
 
@@ -27,4 +28,10 @@
    * Hides the popup.
    */
   close(): void;
+
+  /**
+   * Appends the given element as a child to the popup. Only call this method
+   * when you have called `popup()` without a `moduleName`.
+   */
+  appendContent(el: HTMLElement): void;
 }
diff --git a/polygerrit-ui/app/api/rest-api.ts b/polygerrit-ui/app/api/rest-api.ts
index 4a4b79d..f86e825 100644
--- a/polygerrit-ui/app/api/rest-api.ts
+++ b/polygerrit-ui/app/api/rest-api.ts
@@ -240,7 +240,7 @@
  * The AccountDetailInfo entity contains detailed information about an account.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-accounts.html#account-detail-info
  */
-export interface AccountDetailInfo extends AccountInfo {
+export declare interface AccountDetailInfo extends AccountInfo {
   registered_on: Timestamp;
 }
 
@@ -249,7 +249,7 @@
  * from the accounts section.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#accounts-config-info
  */
-export interface AccountsConfigInfo {
+export declare interface AccountsConfigInfo {
   visibility: string;
   default_display_name: DefaultDisplayNameConfig;
 }
@@ -320,7 +320,7 @@
  * configuration of the Gerrit server.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#auth-info
  */
-export interface AuthInfo {
+export declare interface AuthInfo {
   auth_type: AuthType; // docs incorrectly names it 'type'
   use_contributor_agreements?: boolean;
   contributor_agreements?: ContributorAgreementInfo[];
@@ -356,7 +356,7 @@
  * from the change section.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#change-config-info
  */
-export interface ChangeConfigInfo {
+export declare interface ChangeConfigInfo {
   allow_blame?: boolean;
   large_change: number;
   update_delay: number;
@@ -464,14 +464,14 @@
  * The CommentLinkInfo entity describes acommentlink.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#commentlink-info
  */
-export interface CommentLinkInfo {
+export declare interface CommentLinkInfo {
   match: string;
   link?: string;
   enabled?: boolean;
   html?: string;
 }
 
-export interface CommentLinks {
+export declare interface CommentLinks {
   [name: string]: CommentLinkInfo;
 }
 
@@ -492,7 +492,8 @@
   resolve_conflicts_web_links?: WebLinkInfo[];
 }
 
-export interface ConfigArrayParameterInfo extends ConfigParameterInfoBase {
+export declare interface ConfigArrayParameterInfo
+  extends ConfigParameterInfoBase {
   type: ConfigParameterInfoType.ARRAY;
   values: string[];
 }
@@ -502,7 +503,7 @@
  * project configuration.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#config-info
  */
-export interface ConfigInfo {
+export declare interface ConfigInfo {
   description?: string;
   use_contributor_agreements?: InheritedBooleanInfo;
   use_content_merge?: InheritedBooleanInfo;
@@ -525,7 +526,8 @@
   reject_empty_commit?: InheritedBooleanInfo;
 }
 
-export interface ConfigListParameterInfo extends ConfigParameterInfoBase {
+export declare interface ConfigListParameterInfo
+  extends ConfigParameterInfoBase {
   type: ConfigParameterInfoType.LIST;
   permitted_values?: string[];
 }
@@ -539,7 +541,7 @@
  * The ConfigParameterInfo entity describes a project configurationparameter.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#config-parameter-info
  */
-export interface ConfigParameterInfoBase {
+export declare interface ConfigParameterInfoBase {
   display_name?: string;
   description?: string;
   warning?: string;
@@ -554,7 +556,7 @@
 }
 
 // https://gerrit-review.googlesource.com/Documentation/rest-api-accounts.html#contributor-agreement-info
-export interface ContributorAgreementInfo {
+export declare interface ContributorAgreementInfo {
   name: string;
   description: string;
   url: string;
@@ -584,7 +586,7 @@
  * options.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#download-info
  */
-export interface DownloadInfo {
+export declare interface DownloadInfo {
   schemes: SchemesInfoMap;
   archives: string[];
 }
@@ -594,7 +596,7 @@
  * scheme and its commands.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html
  */
-export interface DownloadSchemeInfo {
+export declare interface DownloadSchemeInfo {
   url: string;
   is_auth_required: boolean;
   is_auth_supported: boolean;
@@ -634,7 +636,7 @@
  * the gerrit section.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#gerrit-info
  */
-export interface GerritInfo {
+export declare interface GerritInfo {
   all_projects: string; // Doc contains incorrect name
   all_users: string; // Doc contains incorrect name
   doc_search: boolean;
@@ -685,7 +687,7 @@
  * Gerrit internal group, or an external group that is known to Gerrit.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-groups.html#group-info
  */
-export interface GroupInfo {
+export declare interface GroupInfo {
   id: GroupId;
   name?: GroupName;
   url?: string;
@@ -706,7 +708,7 @@
  * Options of the group.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-groups.html
  */
-export interface GroupOptionsInfo {
+export declare interface GroupOptionsInfo {
   visible_to_all: boolean;
 }
 
@@ -718,7 +720,7 @@
  * A boolean value that can also be inherited.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#inherited-boolean-info
  */
-export interface InheritedBooleanInfo {
+export declare interface InheritedBooleanInfo {
   value: boolean;
   configured_value: InheritedBooleanInfoConfiguredValue;
   inherited_value?: boolean;
@@ -750,7 +752,7 @@
  * has.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#label-type-info
  */
-export interface LabelTypeInfo {
+export declare interface LabelTypeInfo {
   values: LabelTypeInfoValues;
   default_value: number;
 }
@@ -765,7 +767,7 @@
  * size limit of a project.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#max-object-size-limit-info
  */
-export interface MaxObjectSizeLimitInfo {
+export declare interface MaxObjectSizeLimitInfo {
   value?: string;
   configured_value?: string;
   summary?: string;
@@ -793,7 +795,7 @@
  * plugins.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#plugin-config-info
  */
-export interface PluginConfigInfo {
+export declare interface PluginConfigInfo {
   has_avatars: boolean;
   // Exists in Java class, but not mentioned in docs.
   js_resource_paths: string[];
@@ -828,7 +830,7 @@
  * The ProjectInfo entity contains information about a project
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#project-info
  */
-export interface ProjectInfo {
+export declare interface ProjectInfo {
   id: UrlEncodedRepoName;
   // name is not set if returned in a map where the project name is used as
   // map key
@@ -845,7 +847,7 @@
   web_links?: WebLinkInfo[];
 }
 
-export interface ProjectInfoWithName extends ProjectInfo {
+export declare interface ProjectInfoWithName extends ProjectInfo {
   name: RepoName;
 }
 
@@ -891,7 +893,7 @@
  * git-receive-pack behavior on the server.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#receive-info
  */
-export interface ReceiveInfo {
+export declare interface ReceiveInfo {
   enable_signed_push?: string;
 }
 
@@ -964,7 +966,7 @@
  * Gerrit server.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#server-info
  */
-export interface ServerInfo {
+export declare interface ServerInfo {
   accounts: AccountsConfigInfo;
   auth: AuthInfo;
   change: ChangeConfigInfo;
@@ -999,7 +1001,7 @@
  * project inheritance.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#submit-type-info
  */
-export interface SubmitTypeInfo {
+export declare interface SubmitTypeInfo {
   value: Exclude<SubmitType, SubmitType.INHERIT>;
   configured_value: SubmitType;
   inherited_value: Exclude<SubmitType, SubmitType.INHERIT>;
@@ -1010,7 +1012,7 @@
  * the suggest section.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#suggest-info
  */
-export interface SuggestInfo {
+export declare interface SuggestInfo {
   from: number;
 }
 
@@ -1038,7 +1040,7 @@
  * from the user section.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#user-config-info
  */
-export interface UserConfigInfo {
+export declare interface UserConfigInfo {
   anonymous_coward_name: string;
 }
 
diff --git a/polygerrit-ui/app/api/styles.ts b/polygerrit-ui/app/api/styles.ts
index ded3beb..55ac2cc 100644
--- a/polygerrit-ui/app/api/styles.ts
+++ b/polygerrit-ui/app/api/styles.ts
@@ -29,14 +29,15 @@
  */
 
 /** Lit plugins can cast Style to CSSResult. */
-export interface Style {
+export declare interface Style {
   toString(): string;
 }
 
-export interface Styles {
+export declare interface Styles {
   font: Style;
   form: Style;
   menuPage: Style;
+  spinner: Style;
   subPage: Style;
   table: Style;
 }
diff --git a/polygerrit-ui/app/compile_generated_templates.sh b/polygerrit-ui/app/compile_generated_templates.sh
new file mode 100755
index 0000000..68bf485
--- /dev/null
+++ b/polygerrit-ui/app/compile_generated_templates.sh
@@ -0,0 +1 @@
+$1 --project $2 --baseUrl ./external/ui_npm/node_modules/ --rootDir null
diff --git a/polygerrit-ui/app/constants/constants.ts b/polygerrit-ui/app/constants/constants.ts
index 8f94b38..645e770 100644
--- a/polygerrit-ui/app/constants/constants.ts
+++ b/polygerrit-ui/app/constants/constants.ts
@@ -306,3 +306,5 @@
 }
 
 export const RELOAD_DASHBOARD_INTERVAL_MS = 10 * 1000;
+
+export const SHOWN_ITEMS_COUNT = 25;
diff --git a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts
index 6efaf0c..2328a05 100644
--- a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts
+++ b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts
@@ -115,7 +115,7 @@
 
   _updateSection(section: PermissionAccessSection) {
     this._permissions = toSortedPermissionsArray(section.value.permissions);
-    this._originalId = section.id as GitRef;
+    this._originalId = section.id;
   }
 
   _handleAccessSaved() {
@@ -170,7 +170,9 @@
   _computePermissions(
     name: string,
     capabilities?: CapabilityInfoMap,
-    labels?: LabelNameToLabelTypeInfoMap
+    labels?: LabelNameToLabelTypeInfoMap,
+    // This is just for triggering re-computation. We don't use the value.
+    _?: unknown
   ) {
     let allPermissions;
     const section = this.section;
@@ -227,10 +229,10 @@
   _computePermissionName(
     name: string,
     permission: PermissionArrayItem<EditablePermissionInfo>,
-    capabilities: CapabilityInfoMap
-  ) {
+    capabilities?: CapabilityInfoMap
+  ): string | undefined {
     if (name === GLOBAL_NAME) {
-      return capabilities[permission.id].name;
+      return capabilities?.[permission.id].name;
     } else if (AccessPermissions[permission.id]) {
       return AccessPermissions[permission.id].name;
     } else if (permission.value.label) {
@@ -313,7 +315,7 @@
     if (
       editing &&
       this.section &&
-      this._isEditEnabled(canUpload, ownerOf, this.section.id as GitRef)
+      this._isEditEnabled(canUpload, ownerOf, this.section.id)
     ) {
       classList.push('editing');
     }
@@ -331,7 +333,7 @@
   }
 
   _handleAddPermission() {
-    const value = this.$.permissionSelect.value;
+    const value = this.$.permissionSelect.value as GitRef;
     const permission: PermissionArrayItem<EditablePermissionInfo> = {
       id: value,
       value: {rules: {}, added: true},
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
index cdd2913..ea70d7e 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
@@ -23,7 +23,6 @@
 import '../gr-create-group-dialog/gr-create-group-dialog';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-admin-group-list_html';
-import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property, observe, computed} from '@polymer/decorators';
 import {AppElementAdminParams} from '../../gr-app-types';
@@ -32,6 +31,7 @@
 import {GrCreateGroupDialog} from '../gr-create-group-dialog/gr-create-group-dialog';
 import {fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -46,11 +46,8 @@
   };
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
-
 @customElement('gr-admin-group-list')
-export class GrAdminGroupList extends base {
+export class GrAdminGroupList extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -62,7 +59,7 @@
    * Offset of currently visible query results.
    */
   @property({type: Number})
-  _offset?: number;
+  _offset = 0;
 
   @property({type: String})
   readonly _path = '/admin/groups';
@@ -82,7 +79,7 @@
    * */
   @computed('_groups')
   get _shownGroups() {
-    return this.computeShownItems(this._groups);
+    return this._groups.slice(0, SHOWN_ITEMS_COUNT);
   }
 
   @property({type: Number})
@@ -106,8 +103,8 @@
   @observe('params')
   _paramsChanged(params: AppElementAdminParams) {
     this._loading = true;
-    this._filter = this.getFilterValue(params);
-    this._offset = this.getOffsetValue(params);
+    this._filter = params?.filter ?? '';
+    this._offset = Number(params?.offset ?? 0);
 
     return this._getGroups(this._filter, this._groupsPerPage, this._offset);
   }
@@ -184,4 +181,8 @@
   _visibleToAll(item: GroupInfo) {
     return item.options?.visible_to_all === true ? 'Y' : 'N';
   }
+
+  computeLoadingClass(loading: boolean) {
+    return loading ? 'loading' : '';
+  }
 }
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
index 70e146f..a3afc5c 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
@@ -24,11 +24,6 @@
     /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
   </style>
   <style include="gr-page-nav-styles">
-    gr-dropdown-list {
-      --trigger-style: {
-        text-transform: none;
-      }
-    }
     .breadcrumbText {
       /* Same as dropdown trigger so chevron spacing is consistent. */
       padding: 5px 4px;
diff --git a/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.ts b/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.ts
index 5a48399..04d3198 100644
--- a/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.ts
@@ -45,7 +45,7 @@
   @property({type: String})
   itemTypeName?: string;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
@@ -57,7 +57,7 @@
     ];
   }
 
-  render() {
+  override render() {
     const item = this.item ?? 'UNKNOWN ITEM';
     const itemTypeName = this.itemTypeName ?? 'UNKNOWN ITEM TYPE';
     return html` <gr-dialog
diff --git a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts
index 63b10ec..15f6f4b 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts
@@ -32,7 +32,7 @@
   InheritedBooleanInfo,
 } from '../../../types/common';
 import {InheritedBooleanInfoConfiguredValue} from '../../../constants/constants';
-import {GrAutocomplete} from '../../shared/gr-autocomplete/gr-autocomplete';
+import {GrTypedAutocomplete} from '../../shared/gr-autocomplete/gr-autocomplete';
 import {IronAutogrowTextareaElement} from '@polymer/iron-autogrow-textarea/iron-autogrow-textarea';
 import {appContext} from '../../../services/app-context';
 import {Subject} from 'rxjs';
@@ -41,6 +41,7 @@
   serverConfig$,
 } from '../../../services/config/config-model';
 import {takeUntil} from 'rxjs/operators';
+import {IronInputElement} from '@polymer/iron-input/iron-input';
 
 const SUGGESTIONS_LIMIT = 15;
 const REF_PREFIX = 'refs/heads/';
@@ -48,8 +49,8 @@
 export interface GrCreateChangeDialog {
   $: {
     privateChangeCheckBox: HTMLInputElement;
-    branchInput: GrAutocomplete;
-    tagNameInput: HTMLInputElement;
+    branchInput: GrTypedAutocomplete<BranchName>;
+    tagNameInput: IronInputElement;
     messageInput: IronAutogrowTextareaElement;
   };
 }
@@ -63,19 +64,19 @@
   repoName?: RepoName;
 
   @property({type: String})
-  branch?: BranchName;
+  branch = '' as BranchName;
 
   @property({type: Object})
   _repoConfig?: ConfigInfo;
 
   @property({type: String})
-  subject?: string;
+  subject = '';
 
   @property({type: String})
   topic?: string;
 
   @property({type: Object})
-  _query?: (input: string) => Promise<{name: string}[]>;
+  _query?: (input: string) => Promise<{name: BranchName}[]>;
 
   @property({type: String})
   baseChange?: ChangeId;
@@ -90,7 +91,7 @@
   canCreate = false;
 
   @property({type: Boolean})
-  _privateChangesEnabled?: boolean;
+  _privateChangesEnabled = false;
 
   restApiService = appContext.restApiService;
 
@@ -120,7 +121,7 @@
     super.disconnectedCallback();
   }
 
-  _computeBranchClass(baseChange: boolean) {
+  _computeBranchClass(baseChange?: ChangeId) {
     return baseChange ? 'hide' : '';
   }
 
@@ -165,19 +166,19 @@
       .getRepoBranches(input, this.repoName, SUGGESTIONS_LIMIT)
       .then(response => {
         if (!response) return [];
-        const branches = [];
+        const branches: Array<{name: BranchName}> = [];
         for (const branchInfo of response) {
           let name: string = branchInfo.ref;
           if (name.startsWith('refs/heads/')) {
             name = name.substring('refs/heads/'.length);
           }
-          branches.push({name});
+          branches.push({name: name as BranchName});
         }
         return branches;
       });
   }
 
-  _formatBooleanString(config: InheritedBooleanInfo) {
+  _formatBooleanString(config?: InheritedBooleanInfo) {
     if (
       config &&
       config.configured_value === InheritedBooleanInfoConfiguredValue.TRUE
diff --git a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_test.ts b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_test.ts
index a9de24a..9ed5d81 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_test.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog_test.ts
@@ -20,7 +20,11 @@
 import {GrCreateChangeDialog} from './gr-create-change-dialog';
 import {BranchName, GitRef, RepoName} from '../../../types/common';
 import {InheritedBooleanInfoConfiguredValue} from '../../../constants/constants';
-import {createChange, createConfig} from '../../../test/test-data-generators';
+import {
+  createChange,
+  createConfig,
+  TEST_CHANGE_ID,
+} from '../../../test/test-data-generators';
 import {stubRestApi} from '../../../test/test-utils';
 
 const basicFixture = fixtureFromElement('gr-create-change-dialog');
@@ -130,8 +134,8 @@
   });
 
   test('_computeBranchClass', () => {
-    assert.equal(element._computeBranchClass(true), 'hide');
-    assert.equal(element._computeBranchClass(false), '');
+    assert.equal(element._computeBranchClass(TEST_CHANGE_ID), 'hide');
+    assert.equal(element._computeBranchClass(undefined), '');
   });
 
   test('_computePrivateSectionClass', () => {
diff --git a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts
index d40b810..6605350 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts
@@ -17,11 +17,9 @@
 
 import '../../../styles/gr-table-styles';
 import '../../../styles/shared-styles';
-import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../shared/gr-account-link/gr-account-link';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-group-audit-log_html';
-import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property} from '@polymer/decorators';
 import {
@@ -36,11 +34,8 @@
 import {appContext} from '../../../services/app-context';
 import {ErrorCallback} from '../../../api/rest';
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
-
 @customElement('gr-group-audit-log')
-export class GrGroupAuditLog extends base {
+export class GrGroupAuditLog extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -130,6 +125,10 @@
 
     return '';
   }
+
+  computeLoadingClass(loading: boolean) {
+    return loading ? 'loading' : '';
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts
index 40c2f30..828aa55 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log_html.ts
@@ -43,7 +43,7 @@
       <template is="dom-repeat" items="[[_auditLog]]">
         <tr class="table">
           <td class="date">
-            <gr-date-formatter has-tooltip="" date-str="[[item.date]]">
+            <gr-date-formatter withTooltip date-str="[[item.date]]">
             </gr-date-formatter>
           </td>
           <td class="type">[[itemType(item.type)]]</td>
diff --git a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_test.js b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_test.js
index d26d14c..b91b04b 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_test.js
+++ b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members_test.js
@@ -140,7 +140,7 @@
     'https://test/site/group/url');
   });
 
-  test('save members correctly', () => {
+  test('save members correctly', async () => {
     element._groupOwner = true;
 
     const memberName = 'test-admin';
@@ -155,6 +155,7 @@
     element.$.groupMemberSearchInput.text = memberName;
     element.$.groupMemberSearchInput.value = 1234;
 
+    await flush();
     assert.isFalse(button.hasAttribute('disabled'));
 
     return element._handleSavingGroupMember().then(() => {
@@ -165,7 +166,7 @@
     });
   });
 
-  test('save included groups correctly', () => {
+  test('save included groups correctly', async () => {
     element._groupOwner = true;
 
     const includedGroupName = 'testName';
@@ -179,7 +180,7 @@
 
     element.$.includedGroupSearchInput.text = includedGroupName;
     element.$.includedGroupSearchInput.value = 'testId';
-
+    await flush();
     assert.isFalse(button.hasAttribute('disabled'));
 
     return element._handleSavingIncludedGroups().then(() => {
diff --git a/polygerrit-ui/app/elements/admin/gr-group/gr-group_test.js b/polygerrit-ui/app/elements/admin/gr-group/gr-group_test.js
index e492a15..e390ac5 100644
--- a/polygerrit-ui/app/elements/admin/gr-group/gr-group_test.js
+++ b/polygerrit-ui/app/elements/admin/gr-group/gr-group_test.js
@@ -94,6 +94,7 @@
 
     element.$.groupNameInput.text = groupName2;
 
+    await flush();
     assert.isFalse(button.hasAttribute('disabled'));
     assert.isTrue(element.$.groupName.classList.contains('edited'));
 
@@ -122,6 +123,7 @@
 
     element.$.groupOwnerInput.text = 'testId2';
 
+    await flush();
     assert.isFalse(button.hasAttribute('disabled'));
     assert.isTrue(element.$.groupOwner.classList.contains('edited'));
 
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.ts b/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.ts
index 9eb9b07..2d3b5c3 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.ts
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.ts
@@ -28,7 +28,6 @@
   PluginConfigOptionsChangedEventDetail,
   ArrayPluginOption,
 } from '../gr-repo-plugin-config/gr-repo-plugin-config-types';
-import {KeydownEvent} from '../../../types/events';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -75,7 +74,7 @@
     this._handleAdd();
   }
 
-  _handleInputKeydown(e: KeydownEvent) {
+  _handleInputKeydown(e: KeyboardEvent) {
     // Enter.
     if (e.keyCode === 13) {
       e.preventDefault();
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
index 13bd79d..9f51688 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
@@ -19,25 +19,21 @@
 import '../../shared/gr-list-view/gr-list-view';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-plugin-list_html';
-import {
-  ListViewMixin,
-  ListViewParams,
-} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {customElement, property} from '@polymer/decorators';
 import {PluginInfo} from '../../../types/common';
 import {firePageError, fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
 import {ErrorCallback} from '../../../api/rest';
+import {encodeURL, getBaseUrl} from '../../../utils/url-util';
+import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
+import {ListViewParams} from '../../gr-app-types';
 
 interface PluginInfoWithName extends PluginInfo {
   name: string;
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
-
 @customElement('gr-plugin-list')
-export class GrPluginList extends base {
+export class GrPluginList extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -85,8 +81,8 @@
 
   _paramsChanged(params: ListViewParams) {
     this._loading = true;
-    this._filter = this.getFilterValue(params);
-    this._offset = this.getOffsetValue(params);
+    this._filter = params?.filter ?? '';
+    this._offset = Number(params?.offset ?? 0);
 
     return this._getPlugins(this._filter, this._pluginsPerPage, this._offset);
   }
@@ -114,7 +110,15 @@
   }
 
   _computePluginUrl(id: string) {
-    return this.getUrl('/', id);
+    return getBaseUrl() + '/' + encodeURL(id, true);
+  }
+
+  computeLoadingClass(loading: boolean) {
+    return loading ? 'loading' : '';
+  }
+
+  computeShownItems(plugins: PluginInfoWithName[]) {
+    return plugins.slice(0, SHOWN_ITEMS_COUNT);
   }
 }
 
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts
index fc7ef4b..7800653 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts
@@ -43,7 +43,7 @@
 
   private readonly restApiService = appContext.restApiService;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       tableStyles,
@@ -63,7 +63,7 @@
     ];
   }
 
-  render() {
+  override render() {
     return html` <table
       id="list"
       class="genericList ${this._computeLoadingClass(this._loading)}"
@@ -114,7 +114,7 @@
     </table>`;
   }
 
-  updated(changedProperties: PropertyValues) {
+  override updated(changedProperties: PropertyValues) {
     if (changedProperties.has('repo')) {
       this.repoChanged();
     }
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
index 3693845..052e07a 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
@@ -30,7 +30,6 @@
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-repo-detail-list_html';
-import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {encodeURL} from '../../../utils/url-util';
 import {customElement, property} from '@polymer/decorators';
 import {GrOverlay} from '../../shared/gr-overlay/gr-overlay';
@@ -49,6 +48,7 @@
 import {firePageError} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
 import {ErrorCallback} from '../../../api/rest';
+import {SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 
 const PGP_START = '-----BEGIN PGP SIGNATURE-----';
 
@@ -60,11 +60,8 @@
   };
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
-
 @customElement('gr-repo-detail-list')
-export class GrRepoDetailList extends base {
+export class GrRepoDetailList extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -85,7 +82,7 @@
   _loggedIn = false;
 
   @property({type: Number})
-  _offset?: number;
+  _offset = 0;
 
   @property({type: String})
   _repo?: RepoName;
@@ -155,8 +152,8 @@
 
     this.detailType = params.detail;
 
-    this._filter = this.getFilterValue(params);
-    this._offset = this.getOffsetValue(params);
+    this._filter = params?.filter ?? '';
+    this._offset = Number(params?.offset ?? 0);
     if (!this.detailType)
       return Promise.reject(new Error('undefined detailType'));
 
@@ -395,6 +392,14 @@
   _computeHideTagger(tagger?: GitPersonInfo) {
     return tagger ? '' : 'hide';
   }
+
+  computeLoadingClass(loading: boolean) {
+    return loading ? 'loading' : '';
+  }
+
+  computeShownItems(items: BranchInfo[] | TagInfo[]) {
+    return items.slice(0, SHOWN_ITEMS_COUNT);
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts
index 4f66f0d..429a6d6 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list_html.ts
@@ -145,10 +145,7 @@
             <td class$="tagger [[_hideIfBranch(detailType)]]">
               <div class$="tagger [[_computeHideTagger(item.tagger)]]">
                 <gr-account-link account="[[item.tagger]]"> </gr-account-link>
-                (<gr-date-formatter
-                  has-tooltip=""
-                  date-str="[[item.tagger.date]]"
-                >
+                (<gr-date-formatter withTooltip date-str="[[item.tagger.date]]">
                 </gr-date-formatter
                 >)
               </div>
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
index e87bb0d..adcfb64 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
@@ -22,16 +22,16 @@
 import '../gr-create-repo-dialog/gr-create-repo-dialog';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-repo-list_html';
-import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property, observe, computed} from '@polymer/decorators';
 import {AppElementAdminParams} from '../../gr-app-types';
 import {GrOverlay} from '../../shared/gr-overlay/gr-overlay';
 import {RepoName, ProjectInfoWithName} from '../../../types/common';
 import {GrCreateRepoDialog} from '../gr-create-repo-dialog/gr-create-repo-dialog';
-import {ProjectState} from '../../../constants/constants';
+import {ProjectState, SHOWN_ITEMS_COUNT} from '../../../constants/constants';
 import {fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {encodeURL, getBaseUrl} from '../../../utils/url-util';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -46,11 +46,8 @@
   };
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
-
 @customElement('gr-repo-list')
-export class GrRepoList extends base {
+export class GrRepoList extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -59,7 +56,7 @@
   params?: AppElementAdminParams;
 
   @property({type: Number})
-  _offset?: number;
+  _offset = 0;
 
   @property({type: String})
   readonly _path = '/admin/repos';
@@ -84,7 +81,7 @@
 
   @computed('_repos')
   get _shownRepos() {
-    return this.computeShownItems(this._repos);
+    return this._repos.slice(0, SHOWN_ITEMS_COUNT);
   }
 
   private readonly restApiService = appContext.restApiService;
@@ -99,8 +96,8 @@
   @observe('params')
   _paramsChanged(params: AppElementAdminParams) {
     this._loading = true;
-    this._filter = this.getFilterValue(params);
-    this._offset = this.getOffsetValue(params);
+    this._filter = params?.filter ?? '';
+    this._offset = Number(params?.offset ?? 0);
 
     return this._getRepos(this._filter, this._reposPerPage, this._offset);
   }
@@ -115,7 +112,7 @@
   }
 
   _computeRepoUrl(name: string) {
-    return this.getUrl(this._path + '/', name);
+    return getBaseUrl() + this._path + '/' + encodeURL(name, true);
   }
 
   _computeChangesLink(name: string) {
@@ -185,4 +182,8 @@
     const webLinks = repo.web_links;
     return webLinks.length ? webLinks : null;
   }
+
+  computeLoadingClass(loading: boolean) {
+    return loading ? 'loading' : '';
+  }
 }
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.ts b/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.ts
index 02339cf..32812dd 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.ts
@@ -119,15 +119,7 @@
   private renderOption(option: PluginOption) {
     return html`
       <section class="section ${option.info.type}">
-        <span class="title">
-          <gr-tooltip-content
-            has-tooltip="${option.info.description}"
-            show-icon="${option.info.description}"
-            title="${option.info.description}"
-          >
-            <span>${option.info.display_name}</span>
-          </gr-tooltip-content>
-        </span>
+        <span class="title"> ${this.renderOptionTitle(option)} </span>
         <span class="value">
           ${this.renderOptionDetail(option)} ${this.renderInherited(option)}
         </span>
@@ -135,12 +127,24 @@
     `;
   }
 
+  private renderOptionTitle(option: PluginOption) {
+    const titleName = html`<span>${option.info.display_name}</span>`;
+    if (!option.info.description) return titleName;
+    return html` <gr-tooltip-content
+      has-tooltip
+      show-icon
+      title="${option.info.description}"
+    >
+      ${titleName}
+    </gr-tooltip-content>`;
+  }
+
   private renderOptionDetail(option: PluginOption) {
     if (option.info.type === ConfigParameterInfoType.ARRAY) {
       return html`
         <gr-plugin-config-array-editor
           @plugin-config-option-changed=${this._handleArrayChange}
-          plugin-option="${option}"
+          .pluginOption="${option}"
         ></gr-plugin-config-array-editor>
       `;
     } else if (option.info.type === ConfigParameterInfoType.BOOLEAN) {
@@ -155,7 +159,10 @@
       `;
     } else if (option.info.type === ConfigParameterInfoType.LIST) {
       return html`
-        <gr-select value=${option.info.value} @change=${this._handleListChange}>
+        <gr-select
+          .bindValue=${option.info.value}
+          @change=${this._handleListChange}
+        >
           <select
             data-option-key=${option._key}
             ?disabled=${!option.info.editable}
@@ -173,14 +180,12 @@
     ) {
       return html`
         <iron-input
-          value=${option.info.value}
           @input=${this._handleStringChange}
           data-option-key="${option._key}"
-          ?disabled=${!option.info.editable}
         >
           <input
             is="iron-input"
-            value="${option.info.value}"
+            .value="${option.info.value ?? ''}"
             @input=${this._handleStringChange}
             data-option-key="${option._key}"
             ?disabled=${!option.info.editable}
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts
index 313b91f..c476d2d 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts
@@ -28,7 +28,6 @@
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-change-list-item_html';
-import {ChangeTableMixin} from '../../../mixins/gr-change-table-mixin/gr-change-table-mixin';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {getDisplayName} from '../../../utils/display-name-util';
 import {getPluginEndpoints} from '../../shared/gr-js-api-interface/gr-plugin-endpoints';
@@ -76,11 +75,8 @@
 // How many reviewers should be shown with an account-label?
 const PRIMARY_REVIEWERS_COUNT = 2;
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ChangeTableMixin(PolymerElement);
-
 @customElement('gr-change-list-item')
-export class GrChangeListItem extends base {
+export class GrChangeListItem extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -288,7 +284,7 @@
    * @param truncate whether or not the project name should be
    * truncated. If this value is truthy, the name will be truncated.
    */
-  _computeRepoDisplay(change: ChangeInfo | undefined, truncate: boolean) {
+  _computeRepoDisplay(change?: ChangeInfo) {
     if (!change?.project) {
       return '';
     }
@@ -296,7 +292,19 @@
     if (change.internalHost) {
       str += change.internalHost + '/';
     }
-    str += truncate ? truncatePath(change.project, 2) : change.project;
+    str += change.project;
+    return str;
+  }
+
+  _computeTruncatedRepoDisplay(change?: ChangeInfo) {
+    if (!change?.project) {
+      return '';
+    }
+    let str = '';
+    if (change.internalHost) {
+      str += change.internalHost + '/';
+    }
+    str += truncatePath(change.project, 2);
     return str;
   }
 
@@ -354,10 +362,7 @@
     return this._computeAdditionalReviewers(change).length;
   }
 
-  _computeAdditionalReviewersTitle(
-    change: ChangeInfo | undefined,
-    config: ServerInfo
-  ) {
+  _computeAdditionalReviewersTitle(change?: ChangeInfo, config?: ServerInfo) {
     if (!change || !config) return '';
     return this._computeAdditionalReviewers(change)
       .map(user => getDisplayName(config, user, true))
@@ -393,13 +398,20 @@
   }
 
   _computeWaiting(
-    account?: AccountInfo,
-    change?: ChangeInfo
+    account?: AccountInfo | null,
+    change?: ChangeInfo | null
   ): Timestamp | undefined {
     if (!account?._account_id || !change?.attention_set) return undefined;
     return change?.attention_set[account._account_id]?.last_update;
   }
 
+  _computeIsColumnHidden(columnToCheck?: string, columnsToDisplay?: string[]) {
+    if (!columnsToDisplay || !columnToCheck) {
+      return false;
+    }
+    return !columnsToDisplay.includes(columnToCheck);
+  }
+
   toggleReviewed() {
     if (!this.change) return;
     const newVal = !this.change?.reviewed;
@@ -417,6 +429,11 @@
     );
   }
 
+  _formatDate(date: Timestamp | undefined): string | undefined {
+    if (!date) return undefined;
+    return date.toString();
+  }
+
   _handleChangeClick() {
     // Don't prevent the default and neither stop bubbling. We just want to
     // report the click, but then let the browser handle the click on the link.
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
index 8ee6a3f..a0aa962 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
@@ -127,7 +127,7 @@
   </td>
   <td
     class="cell subject"
-    hidden$="[[isColumnHidden('Subject', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Subject', visibleChangeTableColumns)]]"
   >
     <a
       title$="[[change.subject]]"
@@ -143,7 +143,7 @@
   </td>
   <td
     class="cell status"
-    hidden$="[[isColumnHidden('Status', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Status', visibleChangeTableColumns)]]"
   >
     <template is="dom-repeat" items="[[statuses]]" as="status">
       <div class="comma">,</div>
@@ -155,7 +155,7 @@
   </td>
   <td
     class="cell owner"
-    hidden$="[[isColumnHidden('Owner', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Owner', visibleChangeTableColumns)]]"
   >
     <gr-account-link
       highlightAttention
@@ -165,7 +165,7 @@
   </td>
   <td
     class="cell assignee"
-    hidden$="[[isColumnHidden('Assignee', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Assignee', visibleChangeTableColumns)]]"
   >
     <template is="dom-if" if="[[change.assignee]]">
       <gr-account-link
@@ -179,7 +179,7 @@
   </td>
   <td
     class="cell reviewers"
-    hidden$="[[isColumnHidden('Reviewers', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Reviewers', visibleChangeTableColumns)]]"
   >
     <div>
       <template
@@ -204,14 +204,14 @@
       </template>
       <template is="dom-if" if="[[_computeAdditionalReviewersCount(change)]]">
         <span title="[[_computeAdditionalReviewersTitle(change, config)]]">
-          +[[_computeAdditionalReviewersCount(change, config)]]
+          +[[_computeAdditionalReviewersCount(change)]]
         </span>
       </template>
     </div>
   </td>
   <td
     class="cell comments"
-    hidden$="[[isColumnHidden('Comments', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Comments', visibleChangeTableColumns)]]"
   >
     <iron-icon
       hidden$="[[!change.unresolved_comment_count]]"
@@ -221,7 +221,7 @@
   </td>
   <td
     class="cell repo"
-    hidden$="[[isColumnHidden('Repo', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Repo', visibleChangeTableColumns)]]"
   >
     <a class="fullRepo" href$="[[_computeRepoUrl(change)]]">
       [[_computeRepoDisplay(change)]]
@@ -231,12 +231,12 @@
       href$="[[_computeRepoUrl(change)]]"
       title$="[[_computeRepoDisplay(change)]]"
     >
-      [[_computeRepoDisplay(change, 'true')]]
+      [[_computeTruncatedRepoDisplay(change)]]
     </a>
   </td>
   <td
     class="cell branch"
-    hidden$="[[isColumnHidden('Branch', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Branch', visibleChangeTableColumns)]]"
   >
     <a href$="[[_computeRepoBranchURL(change)]]"> [[change.branch]] </a>
     <template is="dom-if" if="[[change.topic]]">
@@ -250,38 +250,38 @@
   </td>
   <td
     class="cell updated"
-    hidden$="[[isColumnHidden('Updated', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Updated', visibleChangeTableColumns)]]"
   >
     <gr-date-formatter
-      has-tooltip=""
-      date-str="[[change.updated]]"
+      withTooltip
+      date-str="[[_formatDate(change.updated)]]"
     ></gr-date-formatter>
   </td>
   <td
     class="cell submitted"
-    hidden$="[[isColumnHidden('Submitted', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Submitted', visibleChangeTableColumns)]]"
   >
     <gr-date-formatter
-      has-tooltip=""
-      date-str="[[change.submitted]]"
+      withTooltip
+      date-str="[[_formatDate(change.submitted)]]"
     ></gr-date-formatter>
   </td>
   <td
     class="cell waiting"
-    hidden$="[[isColumnHidden('Waiting', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Waiting', visibleChangeTableColumns)]]"
   >
     <gr-date-formatter
-      has-tooltip=""
-      force-relative=""
-      relative-option-no-ago=""
+      withTooltip
+      forceRelative
+      relativeOptionNoAgo
       date-str="[[_computeWaiting(account, change)]]"
     ></gr-date-formatter>
   </td>
   <td
     class="cell size"
-    hidden$="[[isColumnHidden('Size', visibleChangeTableColumns)]]"
+    hidden$="[[_computeIsColumnHidden('Size', visibleChangeTableColumns)]]"
   >
-    <gr-tooltip-content has-tooltip="" title="[[_computeSizeTooltip(change)]]">
+    <gr-tooltip-content has-tooltip title="[[_computeSizeTooltip(change)]]">
       <template is="dom-if" if="[[_changeSize]]">
         <span>[[_changeSize]]</span>
       </template>
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_test.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_test.ts
index ac0b929..34cb6eb 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_test.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_test.ts
@@ -29,6 +29,7 @@
   TopicName,
 } from '../../../types/common';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
+import {columnNames} from '../gr-change-list/gr-change-list';
 import './gr-change-list-item';
 import {GrChangeListItem, LabelCategory} from './gr-change-list-item';
 
@@ -372,7 +373,7 @@
 
     await flush();
 
-    for (const column of element.columnNames) {
+    for (const column of columnNames) {
       const elementClass = '.' + column.toLowerCase();
       assert.isFalse(
         queryAndAssert(element, elementClass).hasAttribute('hidden')
@@ -395,7 +396,7 @@
 
     await flush();
 
-    for (const column of element.columnNames) {
+    for (const column of columnNames) {
       const elementClass = '.' + column.toLowerCase();
       if (column === 'Repo') {
         assert.isTrue(
@@ -565,13 +566,13 @@
   });
 
   test('_computeRepoDisplay', () => {
+    assert.equal(element._computeRepoDisplay(change), 'host/a/test/repo');
     assert.equal(
-      element._computeRepoDisplay(change, false),
-      'host/a/test/repo'
+      element._computeTruncatedRepoDisplay(change),
+      'host/…/test/repo'
     );
-    assert.equal(element._computeRepoDisplay(change, true), 'host/…/test/repo');
     delete change.internalHost;
-    assert.equal(element._computeRepoDisplay(change, false), 'a/test/repo');
-    assert.equal(element._computeRepoDisplay(change, true), '…/test/repo');
+    assert.equal(element._computeRepoDisplay(change), 'a/test/repo');
+    assert.equal(element._computeTruncatedRepoDisplay(change), '…/test/repo');
   });
 });
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts
index 40674d4..ac44908 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts
@@ -24,7 +24,6 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-change-list_html';
 import {appContext} from '../../../services/app-context';
-import {ChangeTableMixin} from '../../../mixins/gr-change-table-mixin/gr-change-table-mixin';
 import {
   KeyboardShortcutMixin,
   Shortcut,
@@ -47,9 +46,9 @@
   PreferencesInput,
 } from '../../../types/common';
 import {hasAttention} from '../../../utils/attention-set-util';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 import {fireEvent, fireReload} from '../../../utils/event-util';
-import {isShiftPressed} from '../../../utils/dom-util';
+import {isShiftPressed, modifierPressed} from '../../../utils/dom-util';
 import {ScrollMode} from '../../../constants/constants';
 
 const NUMBER_FIXED_COLUMNS = 3;
@@ -57,6 +56,19 @@
 const LABEL_PREFIX_INVALID_PROLOG = 'Invalid-Prolog-Rules-Label-Name--';
 const MAX_SHORTCUT_CHARS = 5;
 
+export const columnNames = [
+  'Subject',
+  'Status',
+  'Owner',
+  'Assignee',
+  'Reviewers',
+  'Comments',
+  'Repo',
+  'Branch',
+  'Updated',
+  'Size',
+];
+
 export interface ChangeListSection {
   name?: string;
   query?: string;
@@ -68,7 +80,7 @@
 }
 
 // This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ChangeTableMixin(KeyboardShortcutMixin(PolymerElement));
+const base = KeyboardShortcutMixin(PolymerElement);
 
 @customElement('gr-change-list')
 export class GrChangeList extends base {
@@ -145,6 +157,8 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   override keyboardShortcuts() {
     return {
       [Shortcut.CURSOR_NEXT_CHANGE]: '_nextChange',
@@ -164,9 +178,7 @@
     super();
     this.cursor.scrollMode = ScrollMode.KEEP_VISIBLE;
     this.cursor.focusOnMove = true;
-    this.addEventListener('keydown', e =>
-      this._scopedKeydownHandler(e as unknown as CustomKeyboardEvent)
-    );
+    this.addEventListener('keydown', e => this._scopedKeydownHandler(e));
   }
 
   override ready() {
@@ -198,10 +210,10 @@
    *
    * Context: Issue 7294
    */
-  _scopedKeydownHandler(e: CustomKeyboardEvent) {
+  _scopedKeydownHandler(e: KeyboardEvent) {
     if (e.keyCode === 13) {
       // Enter.
-      this._openChange(e);
+      this.openChange(e);
     }
   }
 
@@ -219,32 +231,44 @@
       return;
     }
 
-    this.changeTableColumns = this.columnNames;
+    this.changeTableColumns = columnNames;
     this.showNumber = false;
-    this.visibleChangeTableColumns = this.getEnabledColumns(
-      this.columnNames,
-      config,
-      this.flagsService.enabledExperiments
+    this.visibleChangeTableColumns = this.changeTableColumns.filter(col =>
+      this._isColumnEnabled(col, config, this.flagsService.enabledExperiments)
     );
-
     if (account && preferences) {
       this.showNumber = !!(
         preferences && preferences.legacycid_in_change_table
       );
       if (preferences.change_table && preferences.change_table.length > 0) {
-        const prefColumns = this.renameProjectToRepoColumn(
-          preferences.change_table
+        const prefColumns = preferences.change_table.map(column =>
+          column === 'Project' ? 'Repo' : column
         );
-        this.visibleChangeTableColumns = this.getEnabledColumns(
-          prefColumns,
-          config,
-          this.flagsService.enabledExperiments
+        this.visibleChangeTableColumns = prefColumns.filter(col =>
+          this._isColumnEnabled(
+            col,
+            config,
+            this.flagsService.enabledExperiments
+          )
         );
       }
     }
   }
 
   /**
+   * Is the column disabled by a server config or experiment? For example the
+   * assignee feature might be disabled and thus the corresponding column is
+   * also disabled.
+   *
+   */
+  _isColumnEnabled(column: string, config: ServerInfo, experiments: string[]) {
+    if (!config || !config.change) return true;
+    if (column === 'Assignee') return !!config.change.enable_assignee;
+    if (column === 'Comments') return experiments.includes('comments-column');
+    return true;
+  }
+
+  /**
    * This methods allows us to customize the columns per section.
    *
    * @param visibleColumns are the columns according to configs and user prefs
@@ -382,8 +406,8 @@
     );
   }
 
-  _nextChange(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _nextChange(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -394,8 +418,8 @@
     this.selectedIndex = this.cursor.index;
   }
 
-  _prevChange(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _prevChange(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -406,19 +430,21 @@
     this.selectedIndex = this.cursor.index;
   }
 
-  _openChange(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
-      return;
-    }
+  _openChange(e: IronKeyboardEvent) {
+    if (this.modifierPressed(e)) return;
+    this.openChange(e.detail.keyboardEvent);
+  }
 
+  openChange(e: KeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || modifierPressed(e)) return;
     e.preventDefault();
     const change = this._changeForIndex(this.selectedIndex);
     if (change) GerritNav.navigateToChange(change);
   }
 
-  _nextPage(e: CustomKeyboardEvent) {
+  _nextPage(e: IronKeyboardEvent) {
     if (
-      this.shouldSuppressKeyboardShortcut(e) ||
+      this.shortcuts.shouldSuppress(e) ||
       (this.modifierPressed(e) && !isShiftPressed(e))
     ) {
       return;
@@ -428,9 +454,9 @@
     fireEvent(this, 'next-page');
   }
 
-  _prevPage(e: CustomKeyboardEvent) {
+  _prevPage(e: IronKeyboardEvent) {
     if (
-      this.shouldSuppressKeyboardShortcut(e) ||
+      this.shortcuts.shouldSuppress(e) ||
       (this.modifierPressed(e) && !isShiftPressed(e))
     ) {
       return;
@@ -445,8 +471,8 @@
     );
   }
 
-  _toggleChangeReviewed(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _toggleChangeReviewed(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -464,8 +490,8 @@
     changeEl.toggleReviewed();
   }
 
-  _refreshChangeList(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _refreshChangeList(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
 
@@ -473,8 +499,8 @@
     fireReload(this);
   }
 
-  _toggleChangeStar(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _toggleChangeStar(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_test.js b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_test.js
index 0d2056a..4956380 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_test.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list_test.js
@@ -19,8 +19,7 @@
 import './gr-change-list.js';
 import {afterNextRender} from '@polymer/polymer/lib/utils/render-status.js';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
-import {mockPromise, TestKeyboardShortcutBinder} from '../../../test/test-utils.js';
-import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
+import {mockPromise} from '../../../test/test-utils.js';
 import {YOUR_TURN} from '../../core/gr-navigation/gr-navigation.js';
 
 const basicFixture = fixtureFromElement('gr-change-list');
@@ -28,22 +27,6 @@
 suite('gr-change-list basic tests', () => {
   let element;
 
-  suiteSetup(() => {
-    const kb = TestKeyboardShortcutBinder.push();
-    kb.bindShortcut(Shortcut.CURSOR_NEXT_CHANGE, 'j');
-    kb.bindShortcut(Shortcut.CURSOR_PREV_CHANGE, 'k');
-    kb.bindShortcut(Shortcut.OPEN_CHANGE, 'o');
-    kb.bindShortcut(Shortcut.REFRESH_CHANGE_LIST, 'shift+r');
-    kb.bindShortcut(Shortcut.TOGGLE_CHANGE_REVIEWED, 'r');
-    kb.bindShortcut(Shortcut.TOGGLE_CHANGE_STAR, 's');
-    kb.bindShortcut(Shortcut.NEXT_PAGE, 'n');
-    kb.bindShortcut(Shortcut.NEXT_PAGE, 'p');
-  });
-
-  suiteTeardown(() => {
-    TestKeyboardShortcutBinder.pop();
-  });
-
   setup(() => {
     element = basicFixture.instantiate();
   });
@@ -269,7 +252,7 @@
     });
 
     test('all columns visible', () => {
-      for (const column of element.columnNames) {
+      for (const column of element.changeTableColumns) {
         const elementClass = '.' + element._lowerCase(column);
         assert.isFalse(element.shadowRoot
             .querySelector(elementClass).hidden);
@@ -495,11 +478,11 @@
         assert.deepEqual(navStub.lastCall.args[0], {_number: 4},
             'Should navigate to /c/4/');
 
-        MockInteractions.pressAndReleaseKeyOn(element, 82); // 'r'
+        MockInteractions.keyUpOn(element, 82); // 'r'
         const change = element._changeForIndex(element.selectedIndex);
         assert.equal(change.reviewed, true,
             'Should mark change as reviewed');
-        MockInteractions.pressAndReleaseKeyOn(element, 82); // 'r'
+        MockInteractions.keyUpOn(element, 82); // 'r'
         assert.equal(change.reviewed, false,
             'Should mark change as unreviewed');
         promise.resolve();
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
index 456b7cf..9eca3bc 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import '../../../styles/gr-a11y-styles';
 import '../../../styles/shared-styles';
 import '../gr-change-list/gr-change-list';
 import '../../shared/gr-button/gr-button';
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
index 484a952..a55befb 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-a11y-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       display: block;
@@ -39,11 +42,6 @@
       justify-content: space-between;
       padding: var(--spacing-xs) var(--spacing-l);
     }
-    .banner gr-button {
-      --gr-button: {
-        color: var(--primary-text-color);
-      }
-    }
     .hide {
       display: none;
     }
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js
index 96a19e0..aa76347 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js
@@ -128,7 +128,7 @@
 
       // Open confirmation dialog and tap confirm button.
       await element.$.confirmDeleteOverlay.open();
-      MockInteractions.tap(element.$.confirmDeleteDialog.$.confirm);
+      MockInteractions.tap(element.$.confirmDeleteDialog.confirmButton);
       flush();
       assert.isTrue(deleteStub.calledWithExactly('-is:open'));
       assert.isTrue(element.$.confirmDeleteDialog.disabled);
diff --git a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts
index beadea3..d8949ed 100644
--- a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 
-import '../../shared/gr-date-formatter/gr-date-formatter';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {RepoName} from '../../../types/common';
 import {WebLinkInfo} from '../../../types/diff';
@@ -73,7 +72,7 @@
       <h1 class="heading-1">${this.repo}</h1>
       <hr />
       <div>
-        <span>Detail:</span> <a href="${this._repoUrl}">Repo settings</a>
+        <span>Detail:</span> <a href="${this._repoUrl!}">Repo settings</a>
       </div>
       ${this._renderLinks(this._webLinks)}
     </div>`;
diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts
index bc21dc0..50de7b9 100644
--- a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts
@@ -48,7 +48,7 @@
 
   private readonly restApiService = appContext.restApiService;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       dashboardHeaderStyles,
@@ -63,8 +63,8 @@
     ];
   }
 
-  render() {
-    return html` <gr-avatar
+  override render() {
+    return html`<gr-avatar
         .account="${this._accountDetails}"
         .imageSize=${100}
         aria-label="Account avatar"
@@ -85,7 +85,7 @@
         <div>
           <span>Joined:</span>
           <gr-date-formatter
-            date-str="${this._computeDetail(
+            dateStr="${this._computeDetail(
               this._accountDetails,
               'registered_on'
             )}"
@@ -95,10 +95,10 @@
         <gr-endpoint-decorator name="user-header">
           <gr-endpoint-param
             name="accountDetails"
-            value="${this._accountDetails}"
+            .value="${this._accountDetails}"
           >
           </gr-endpoint-param>
-          <gr-endpoint-param name="loggedIn" value="${this.loggedIn}">
+          <gr-endpoint-param name="loggedIn" .value="${this.loggedIn}">
           </gr-endpoint-param>
         </gr-endpoint-decorator>
       </div>
@@ -116,7 +116,7 @@
       </div>`;
   }
 
-  updated(changedProperties: PropertyValues) {
+  override updated(changedProperties: PropertyValues) {
     if (changedProperties.has('userId')) {
       this._accountChanged(this.userId);
     }
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
index 614339a..d21c29f 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
@@ -33,6 +33,9 @@
       /* px because don't have the same font size */
       margin-left: 8px;
     }
+    gr-button {
+      display: block;
+    }
     #actionLoadingMessage {
       align-items: center;
       color: var(--deemphasized-text-color);
@@ -57,10 +60,8 @@
         flex-wrap: wrap;
       }
       gr-button {
-        --gr-button: {
-          padding: var(--spacing-m);
-          white-space: nowrap;
-        }
+        --gr-button-padding: var(--spacing-m);
+        white-space: nowrap;
       }
       gr-button,
       gr-dropdown {
@@ -84,24 +85,27 @@
       hidden$="[[_shouldHideActions(_topLevelActions.*, _loading)]]"
     >
       <template is="dom-repeat" items="[[_topLevelPrimaryActions]]" as="action">
-        <gr-button
-          link=""
+        <gr-tooltip-content
           title$="[[action.title]]"
           has-tooltip="[[_computeHasTooltip(action.title)]]"
           position-below="true"
-          data-action-key$="[[action.__key]]"
-          class$="[[action.__key]]"
-          data-action-type$="[[action.__type]]"
-          data-label$="[[action.label]]"
-          disabled$="[[_calculateDisabled(action, _hasKnownChainState)]]"
-          on-click="_handleActionTap"
         >
-          <iron-icon
-            class$="[[_computeHasIcon(action)]]"
-            icon$="gr-icons:[[action.icon]]"
-          ></iron-icon>
-          [[action.label]]
-        </gr-button>
+          <gr-button
+            link=""
+            data-action-key$="[[action.__key]]"
+            class$="[[action.__key]]"
+            data-action-type$="[[action.__type]]"
+            data-label$="[[action.label]]"
+            disabled$="[[_calculateDisabled(action, _hasKnownChainState)]]"
+            on-click="_handleActionTap"
+          >
+            <iron-icon
+              class$="[[_computeHasIcon(action)]]"
+              icon$="gr-icons:[[action.icon]]"
+            ></iron-icon>
+            [[action.label]]
+          </gr-button>
+        </gr-tooltip-content>
       </template>
     </section>
     <section
@@ -113,24 +117,27 @@
         items="[[_topLevelSecondaryActions]]"
         as="action"
       >
-        <gr-button
-          link=""
+        <gr-tooltip-content
           title$="[[action.title]]"
           has-tooltip="[[_computeHasTooltip(action.title)]]"
           position-below="true"
-          data-action-key$="[[action.__key]]"
-          class$="[[action.__key]]"
-          data-action-type$="[[action.__type]]"
-          data-label$="[[action.label]]"
-          disabled$="[[_calculateDisabled(action, _hasKnownChainState)]]"
-          on-click="_handleActionTap"
         >
-          <iron-icon
-            class$="[[_computeHasIcon(action)]]"
-            icon$="gr-icons:[[action.icon]]"
-          ></iron-icon>
-          [[action.label]]
-        </gr-button>
+          <gr-button
+            link=""
+            data-action-key$="[[action.__key]]"
+            class$="[[action.__key]]"
+            data-action-type$="[[action.__type]]"
+            data-label$="[[action.label]]"
+            disabled$="[[_calculateDisabled(action, _hasKnownChainState)]]"
+            on-click="_handleActionTap"
+          >
+            <iron-icon
+              class$="[[_computeHasIcon(action)]]"
+              icon$="gr-icons:[[action.icon]]"
+            ></iron-icon>
+            [[action.label]]
+          </gr-button>
+        </gr-tooltip-content>
       </template>
     </section>
     <gr-button hidden$="[[!_loading]]" disabled=""
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts
index 04326a6..26e2fb4 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.ts
@@ -1094,7 +1094,7 @@
         );
         tap(abandonButton);
 
-        assert.isUndefined(element.$.confirmAbandonDialog.message);
+        assert.equal(element.$.confirmAbandonDialog.message, '');
       });
 
       test('works', () => {
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts
index 08ad2bd..8b46cd8 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 import '../../../styles/shared-styles';
+import '../../../styles/gr-font-styles';
 import '../../../styles/gr-change-metadata-shared-styles';
 import '../../../styles/gr-change-view-integration-shared-styles';
 import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
@@ -751,6 +752,16 @@
           })
       );
   }
+
+  _showNewSubmitRequirements(change?: ParsedChangeInfo) {
+    if (!this._isSubmitRequirementsUiEnabled) return false;
+    return (change?.submit_requirements ?? []).length > 0;
+  }
+
+  _showNewSubmitRequirementWarning(change?: ParsedChangeInfo) {
+    if (!this._isSubmitRequirementsUiEnabled) return false;
+    return (change?.submit_requirements ?? []).length === 0;
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
index c080345..97101f6 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
@@ -20,6 +20,9 @@
   <style include="gr-change-metadata-shared-styles">
     /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
   </style>
+  <style include="gr-font-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       display: table;
@@ -94,7 +97,6 @@
       max-width: 285px;
     }
     .metadata-title {
-      font-weight: var(--font-weight-bold);
       color: var(--deemphasized-text-color);
       padding-left: var(--metadata-horizontal-padding);
     }
@@ -111,10 +113,14 @@
       --iron-icon-height: 18px;
       --iron-icon-width: 18px;
     }
+    .submit-requirement-error {
+      color: var(--deemphasized-text-color);
+      padding-left: var(--metadata-horizontal-padding);
+    }
   </style>
   <gr-external-style id="externalStyle" name="change-metadata">
     <div class="metadata-header">
-      <h3 class="metadata-title">Change Info</h3>
+      <h3 class="metadata-title heading-3">Change Info</h3>
       <gr-button link="" class="show-all-button" on-click="_onShowAllClick"
         >[[_computeShowAllLabelText(_showAllSections)]]
         <iron-icon
@@ -134,9 +140,9 @@
         <span class="title">Submitted</span>
         <span class="value">
           <gr-date-formatter
-            has-tooltip=""
+            withTooltip
             date-str="[[change.submitted]]"
-            show-yesterday=""
+            showYesterday=""
           ></gr-date-formatter>
         </span>
       </section>
@@ -154,9 +160,9 @@
       </span>
       <span class="value">
         <gr-date-formatter
-          has-tooltip=""
+          withTooltip
           date-str="[[change.updated]]"
-          show-yesterday=""
+          showYesterday
         ></gr-date-formatter>
       </span>
     </section>
@@ -354,8 +360,8 @@
               ></gr-commit-info>
               <gr-tooltip-content
                 id="parentNotCurrentMessage"
-                has-tooltip=""
-                show-icon=""
+                has-tooltip
+                show-icon
                 title$="[[_notCurrentMessage]]"
               ></gr-tooltip-content>
             </li>
@@ -478,20 +484,25 @@
       </span>
     </section>
     <div class="separatedSection">
-      <template is="dom-if" if="[[_isSubmitRequirementsUiEnabled]]">
+      <template is="dom-if" if="[[_showNewSubmitRequirements(change)]]">
         <gr-submit-requirements
           change="[[change]]"
           account="[[account]]"
           mutable="[[_mutable]]"
         ></gr-submit-requirements>
       </template>
-      <template is="dom-if" if="[[!_isSubmitRequirementsUiEnabled]]">
+      <template is="dom-if" if="[[!_showNewSubmitRequirements(change)]]">
         <gr-change-requirements
           change="{{change}}"
           account="[[account]]"
           mutable="[[_mutable]]"
         ></gr-change-requirements>
       </template>
+      <template is="dom-if" if="[[_showNewSubmitRequirementWarning(change)]]">
+        <div class="submit-requirement-error">
+          New Submit Requirements don't work on this change.
+        </div>
+      </template>
     </div>
     <section
       id="webLinks"
diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
index 6a31c0a..725bb24 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
@@ -15,9 +15,9 @@
  * limitations under the License.
  */
 import '../../../styles/shared-styles';
+import '../../../styles/gr-font-styles';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-icons/gr-icons';
-import '../../shared/gr-label/gr-label';
 import '../../shared/gr-label-info/gr-label-info';
 import '../../shared/gr-limited-text/gr-limited-text';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts
index d824d94..8161592 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-font-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       display: table;
@@ -104,7 +107,7 @@
       padding-left: 0;
     }
   </style>
-  <h3 class="metadata-title">Submit requirements</h3>
+  <h3 class="metadata-title heading-3">Submit requirements</h3>
   <template is="dom-repeat" items="[[_requirements]]">
     <gr-endpoint-decorator
       class="submit-requirement-endpoints"
diff --git a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
index 831a309..ad8f72f 100644
--- a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
@@ -33,6 +33,7 @@
 import {Action, Category, Link, RunStatus} from '../../../api/checks';
 import {fireShowPrimaryTab} from '../../../utils/event-util';
 import '../../shared/gr-avatar/gr-avatar';
+import '../../checks/gr-checks-action';
 import {
   firstPrimaryLink,
   getResultsOf,
@@ -289,8 +290,6 @@
           color: var(--success-foreground);
         }
         .checksChip.timelapse {
-        }
-        .checksChip.timelapse {
           border-color: var(--gray-foreground);
           background: var(--gray-background);
         }
@@ -514,7 +513,7 @@
         .actions gr-checks-action,
         .actions gr-dropdown {
           vertical-align: top;
-          --padding: 0 var(--spacing-m);
+          --gr-button-padding: 0 var(--spacing-m);
         }
         .actions #moreMessage {
           display: none;
@@ -662,7 +661,7 @@
     const handler = () => this.onChipClick({statusOrCategory});
     return html`<gr-checks-chip
       .statusOrCategory="${statusOrCategory}"
-      .text="${count}"
+      .text="${`${count}`}"
       @click="${handler}"
       @keydown="${(e: KeyboardEvent) => handleSpaceOrEnter(e, handler)}"
     ></gr-checks-chip>`;
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index 58a00f4..fc2cbe5 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 import '@polymer/paper-tabs/paper-tabs';
+import '../../../styles/gr-a11y-styles';
 import '../../../styles/shared-styles';
 import '../../diff/gr-comment-api/gr-comment-api';
 import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
@@ -23,7 +24,6 @@
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-change-star/gr-change-star';
 import '../../shared/gr-change-status/gr-change-status';
-import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../shared/gr-editable-content/gr-editable-content';
 import '../../shared/gr-linked-text/gr-linked-text';
 import '../../shared/gr-overlay/gr-overlay';
@@ -48,10 +48,11 @@
 import {
   KeyboardShortcutMixin,
   Shortcut,
+  ShortcutSection,
 } from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {GrEditConstants} from '../../edit/gr-edit-constants';
 import {pluralize} from '../../../utils/string-util';
-import {windowLocationReload} from '../../../utils/dom-util';
+import {windowLocationReload, querySelectorAll} from '../../../utils/dom-util';
 import {
   GeneratedWebLink,
   GerritNav,
@@ -84,6 +85,7 @@
   isCc,
   isOwner,
   isReviewer,
+  isInvolved,
 } from '../../../utils/change-util';
 import {EventType as PluginEventType} from '../../../api/plugin';
 import {customElement, observe, property} from '@polymer/decorators';
@@ -156,8 +158,9 @@
   ParsedChangeInfo,
 } from '../../../types/types';
 import {
+  IronKeyboardEventListener,
   CloseFixPreviewEvent,
-  CustomKeyboardEvent,
+  IronKeyboardEvent,
   EditableContentSaveEvent,
   EventType,
   OpenFixPreviewEvent,
@@ -188,6 +191,11 @@
   changeComments$,
   drafts$,
 } from '../../../services/comments/comments-model';
+import {
+  hasAttention,
+  getAddedByReason,
+  getRemovedByReason,
+} from '../../../utils/attention-set-util';
 
 const MIN_LINES_FOR_COMMIT_COLLAPSE = 18;
 
@@ -530,7 +538,7 @@
   @property({type: Boolean})
   _showRobotCommentsButton = false;
 
-  _throttledToggleChangeStar?: EventListener;
+  _throttledToggleChangeStar?: IronKeyboardEventListener;
 
   @property({type: Boolean})
   _showChecksTab = false;
@@ -557,6 +565,8 @@
 
   private readonly commentsService = appContext.commentsService;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   private replyDialogResizeObserver?: ResizeObserver;
 
   override keyboardShortcuts() {
@@ -579,6 +589,7 @@
       [Shortcut.DIFF_RIGHT_AGAINST_LATEST]: '_handleDiffRightAgainstLatest',
       [Shortcut.DIFF_BASE_AGAINST_LATEST]: '_handleDiffBaseAgainstLatest',
       [Shortcut.OPEN_SUBMIT_DIALOG]: '_handleOpenSubmitDialog',
+      [Shortcut.TOGGLE_ATTENTION_SET]: '_handleToggleAttentionSet',
     };
   }
 
@@ -630,8 +641,8 @@
 
   override connectedCallback() {
     super.connectedCallback();
-    this._throttledToggleChangeStar = throttleWrap(e =>
-      this._handleToggleChangeStar(e as CustomKeyboardEvent)
+    this._throttledToggleChangeStar = throttleWrap<IronKeyboardEvent>(e =>
+      this._handleToggleChangeStar(e)
     );
     this._getServerConfig().then(config => {
       this._serverConfig = config;
@@ -740,8 +751,8 @@
     if (e.detail.fixApplied) fireReload(this);
   }
 
-  _handleToggleDiffMode(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleToggleDiffMode(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1172,6 +1183,9 @@
   _paramsChanged(value: AppElementChangeViewParams) {
     if (value.view !== GerritView.CHANGE) {
       this._initialLoadComplete = false;
+      querySelectorAll(this, 'gr-overlay').forEach(overlay =>
+        (overlay as GrOverlay).close()
+      );
       return;
     }
 
@@ -1481,8 +1495,8 @@
     return label;
   }
 
-  _handleOpenReplyDialog(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleOpenReplyDialog(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
     this._getLoggedIn().then(isLoggedIn => {
@@ -1496,8 +1510,8 @@
     });
   }
 
-  _handleOpenDownloadDialogShortcut(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleOpenDownloadDialogShortcut(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1505,8 +1519,8 @@
     this._handleOpenDownloadDialog();
   }
 
-  _handleEditTopic(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleEditTopic(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1514,8 +1528,8 @@
     this.$.metadata.editTopic();
   }
 
-  _handleOpenSubmitDialog(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || !this._submitEnabled) {
+  _handleOpenSubmitDialog(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || !this._submitEnabled) {
       return;
     }
 
@@ -1523,8 +1537,50 @@
     this.$.actions.showSubmitDialog();
   }
 
-  _handleDiffAgainstBase(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleToggleAttentionSet(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
+      return;
+    }
+    if (!this._change || !this._account?._account_id) return;
+    if (!this._loggedIn || !isInvolved(this._change, this._account)) return;
+    if (!this._change.attention_set) this._change.attention_set = {};
+    if (hasAttention(this._account, this._change)) {
+      const reason = getRemovedByReason(this._account, this._serverConfig);
+      if (this._change.attention_set)
+        delete this._change.attention_set[this._account._account_id];
+      fireAlert(this, 'Removing you from the attention set ...');
+      this.restApiService
+        .removeFromAttentionSet(
+          this._change._number,
+          this._account._account_id,
+          reason
+        )
+        .then(() => {
+          fireEvent(this, 'hide-alert');
+        });
+    } else {
+      const reason = getAddedByReason(this._account, this._serverConfig);
+      fireAlert(this, 'Adding you to the attention set ...');
+      this._change.attention_set[this._account._account_id!] = {
+        account: this._account,
+        reason,
+        reason_account: this._account,
+      };
+      this.restApiService
+        .addToAttentionSet(
+          this._change._number,
+          this._account._account_id,
+          reason
+        )
+        .then(() => {
+          fireEvent(this, 'hide-alert');
+        });
+    }
+    this._change = {...this._change};
+  }
+
+  _handleDiffAgainstBase(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
     assertIsDefined(this._change, '_change');
@@ -1537,8 +1593,8 @@
     GerritNav.navigateToChange(this._change, this._patchRange.patchNum);
   }
 
-  _handleDiffBaseAgainstLeft(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleDiffBaseAgainstLeft(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
     assertIsDefined(this._change, '_change');
@@ -1551,8 +1607,8 @@
     GerritNav.navigateToChange(this._change, this._patchRange.basePatchNum);
   }
 
-  _handleDiffAgainstLatest(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleDiffAgainstLatest(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
     assertIsDefined(this._change, '_change');
@@ -1570,8 +1626,8 @@
     );
   }
 
-  _handleDiffRightAgainstLatest(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleDiffRightAgainstLatest(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
     assertIsDefined(this._change, '_change');
@@ -1589,8 +1645,8 @@
     );
   }
 
-  _handleDiffBaseAgainstLatest(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleDiffBaseAgainstLatest(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
     assertIsDefined(this._change, '_change');
@@ -1607,24 +1663,24 @@
     GerritNav.navigateToChange(this._change, latestPatchNum);
   }
 
-  _handleRefreshChange(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleRefreshChange(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
     e.preventDefault();
     fireReload(this, true);
   }
 
-  _handleToggleChangeStar(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleToggleChangeStar(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
     e.preventDefault();
     this.$.changeStar.toggleStar();
   }
 
-  _handleUpToDashboard(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleUpToDashboard(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1632,8 +1688,8 @@
     this._determinePageBack();
   }
 
-  _handleExpandAllMessages(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleExpandAllMessages(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1643,8 +1699,8 @@
     }
   }
 
-  _handleCollapseAllMessages(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleCollapseAllMessages(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1654,8 +1710,8 @@
     }
   }
 
-  _handleOpenDiffPrefsShortcut(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleOpenDiffPrefsShortcut(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1768,7 +1824,7 @@
       changeIsOpen(change)
     ) {
       fireAlert(this, 'Change edit not found. Please create a change edit.');
-      GerritNav.navigateToChange(change);
+      fireReload(this, true);
       return;
     }
 
@@ -1781,7 +1837,7 @@
         this,
         'Change edits cannot be created if change is merged or abandoned. Redirected to non edit mode.'
       );
-      GerritNav.navigateToChange(change);
+      fireReload(this, true);
       return;
     }
 
@@ -2592,6 +2648,10 @@
       '#relatedChanges'
     );
   }
+
+  createTitle(shortcutName: Shortcut, section: ShortcutSection) {
+    return this.shortcuts.createTitle(shortcutName, section);
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
index fb80822..d57aca8 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-a11y-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     .container:not(.loading) {
       background-color: var(--background-color-tertiary);
@@ -476,7 +479,7 @@
         class="commentThreads"
       >
         <gr-tooltip-content
-          has-tooltip=""
+          has-tooltip
           title$="[[_computeTotalCommentCounts(_change.unresolved_comment_count, _changeComments)]]"
         >
           <span>Comments</span></gr-tooltip-content
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
index 676e066..a82fceb 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
@@ -35,12 +35,7 @@
 import {EventType, PluginApi} from '../../../api/plugin';
 
 import 'lodash/lodash';
-import {
-  mockPromise,
-  stubRestApi,
-  TestKeyboardShortcutBinder,
-} from '../../../test/test-utils';
-import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
+import {mockPromise, stubRestApi} from '../../../test/test-utils';
 import {
   createAppElementChangeViewParams,
   createApproval,
@@ -59,6 +54,7 @@
   createAccountWithIdNameAndEmail,
   createChangeViewChange,
   createRelatedChangeAndCommitInfo,
+  createAccountDetailWithId,
 } from '../../../test/test-data-generators';
 import {ChangeViewPatchRange, GrChangeView} from './gr-change-view';
 import {
@@ -86,13 +82,17 @@
 } from '../../../types/common';
 import {
   pressAndReleaseKeyOn,
+  keyUpOn,
   tap,
 } from '@polymer/iron-test-helpers/mock-interactions';
 import {GrEditControls} from '../../edit/gr-edit-controls/gr-edit-controls';
 import {AppElementChangeViewParams} from '../../gr-app-types';
 import {SinonFakeTimers, SinonStubbedMember} from 'sinon';
 import {RestApiService} from '../../../services/gr-rest-api/gr-rest-api';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {
+  IronKeyboardEvent,
+  IronKeyboardEventDetail,
+} from '../../../types/events';
 import {CommentThread, UIRobot} from '../../../utils/comment-util';
 import {GerritView} from '../../../services/router/router-model';
 import {ParsedChangeInfo} from '../../../types/types';
@@ -110,25 +110,6 @@
     typeof GerritNav.navigateToChange
   >;
 
-  suiteSetup(() => {
-    const kb = TestKeyboardShortcutBinder.push();
-    kb.bindShortcut(Shortcut.SEND_REPLY, 'ctrl+enter');
-    kb.bindShortcut(Shortcut.REFRESH_CHANGE, 'shift+r');
-    kb.bindShortcut(Shortcut.OPEN_REPLY_DIALOG, 'a');
-    kb.bindShortcut(Shortcut.OPEN_DOWNLOAD_DIALOG, 'd');
-    kb.bindShortcut(Shortcut.TOGGLE_DIFF_MODE, 'm');
-    kb.bindShortcut(Shortcut.TOGGLE_CHANGE_STAR, 's');
-    kb.bindShortcut(Shortcut.UP_TO_DASHBOARD, 'u');
-    kb.bindShortcut(Shortcut.EXPAND_ALL_MESSAGES, 'x');
-    kb.bindShortcut(Shortcut.COLLAPSE_ALL_MESSAGES, 'z');
-    kb.bindShortcut(Shortcut.OPEN_DIFF_PREFS, ',');
-    kb.bindShortcut(Shortcut.EDIT_TOPIC, 't');
-  });
-
-  suiteTeardown(() => {
-    TestKeyboardShortcutBinder.pop();
-  });
-
   const ROBOT_COMMENTS_LIMIT = 10;
 
   // TODO: should have a mock service to generate VALID fake data
@@ -366,7 +347,9 @@
         },
       })
     );
-    stubRestApi('getAccount').returns(Promise.resolve(undefined));
+    stubRestApi('getAccount').returns(
+      Promise.resolve(createAccountDetailWithId(5))
+    );
     stubRestApi('getDiffComments').returns(Promise.resolve({}));
     stubRestApi('getDiffRobotComments').returns(Promise.resolve({}));
     stubRestApi('getDiffDrafts').returns(Promise.resolve({}));
@@ -420,8 +403,7 @@
       patchNum: 3 as RevisionPatchSetNum,
       basePatchNum: 1 as BasePatchSetNum,
     };
-    sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-    element._handleDiffAgainstBase(new CustomEvent('') as CustomKeyboardEvent);
+    element._handleDiffAgainstBase(new CustomEvent('') as IronKeyboardEvent);
     assert(navigateToChangeStub.called);
     const args = navigateToChangeStub.getCall(0).args;
     assert.equal(args[0], element._change);
@@ -437,10 +419,7 @@
       basePatchNum: 1 as BasePatchSetNum,
       patchNum: 3 as RevisionPatchSetNum,
     };
-    sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-    element._handleDiffAgainstLatest(
-      new CustomEvent('') as CustomKeyboardEvent
-    );
+    element._handleDiffAgainstLatest(new CustomEvent('') as IronKeyboardEvent);
     assert(navigateToChangeStub.called);
     const args = navigateToChangeStub.getCall(0).args;
     assert.equal(args[0], element._change);
@@ -457,9 +436,8 @@
       patchNum: 3 as RevisionPatchSetNum,
       basePatchNum: 1 as BasePatchSetNum,
     };
-    sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
     element._handleDiffBaseAgainstLeft(
-      new CustomEvent('') as CustomKeyboardEvent
+      new CustomEvent('') as IronKeyboardEvent
     );
     assert(navigateToChangeStub.called);
     const args = navigateToChangeStub.getCall(0).args;
@@ -476,9 +454,8 @@
       basePatchNum: 1 as BasePatchSetNum,
       patchNum: 3 as RevisionPatchSetNum,
     };
-    sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
     element._handleDiffRightAgainstLatest(
-      new CustomEvent('') as CustomKeyboardEvent
+      new CustomEvent('') as IronKeyboardEvent
     );
     assert(navigateToChangeStub.called);
     const args = navigateToChangeStub.getCall(0).args;
@@ -495,9 +472,8 @@
       basePatchNum: 1 as BasePatchSetNum,
       patchNum: 3 as RevisionPatchSetNum,
     };
-    sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
     element._handleDiffBaseAgainstLatest(
-      new CustomEvent('') as CustomKeyboardEvent
+      new CustomEvent('') as IronKeyboardEvent
     );
     assert(navigateToChangeStub.called);
     const args = navigateToChangeStub.getCall(0).args;
@@ -505,6 +481,34 @@
     assert.isNotOk(args[2]);
   });
 
+  test('toggle attention set status', async () => {
+    element._change = {
+      ...createChangeViewChange(),
+      revisions: createRevisions(10),
+    };
+    const addToAttentionSetStub = stubRestApi('addToAttentionSet').returns(
+      Promise.resolve(new Response())
+    );
+
+    const removeFromAttentionSetStub = stubRestApi(
+      'removeFromAttentionSet'
+    ).returns(Promise.resolve(new Response()));
+    element._patchRange = {
+      basePatchNum: 1 as BasePatchSetNum,
+      patchNum: 3 as RevisionPatchSetNum,
+    };
+
+    assert.isNotOk(element._change.attention_set);
+    await element._getLoggedIn();
+    await element.restApiService.getAccount();
+    element._handleToggleAttentionSet(new CustomEvent('') as IronKeyboardEvent);
+    assert.isTrue(addToAttentionSetStub.called);
+    assert.isFalse(removeFromAttentionSetStub.called);
+
+    element._handleToggleAttentionSet(new CustomEvent('') as IronKeyboardEvent);
+    assert.isTrue(removeFromAttentionSetStub.called);
+  });
+
   suite('plugins adding to file tab', () => {
     setup(async () => {
       element._changeNum = TEST_NUMERIC_CHANGE_ID;
@@ -646,7 +650,7 @@
       sinon.stub(element, '_getLoggedIn').returns(Promise.resolve(false));
       const loggedInErrorSpy = sinon.spy();
       element.addEventListener('show-auth-required', loggedInErrorSpy);
-      pressAndReleaseKeyOn(element, 65, null, 'a');
+      keyUpOn(element, 65, null, 'a');
       await flush();
       assert.isFalse(element.$.replyOverlay.opened);
       assert.isTrue(loggedInErrorSpy.called);
@@ -679,7 +683,7 @@
 
       const openSpy = sinon.spy(element, '_openReplyDialog');
 
-      pressAndReleaseKeyOn(element, 65, null, 'a');
+      keyUpOn(element, 65, null, 'a');
       await flush();
       assert.isTrue(element.$.replyOverlay.opened);
       element.$.replyOverlay.close();
@@ -792,7 +796,7 @@
       const stub = sinon
         .stub(element.$.downloadOverlay, 'open')
         .returns(Promise.resolve());
-      pressAndReleaseKeyOn(element, 68, null, 'd');
+      keyUpOn(element, 68, null, 'd');
       assert.isTrue(stub.called);
     });
 
@@ -816,12 +820,13 @@
     });
 
     test('m should toggle diff mode', () => {
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
       const setModeStub = sinon.stub(
         element.$.fileListHeader,
         'setDiffViewMode'
       );
-      const e = {preventDefault: () => {}} as CustomKeyboardEvent;
+      const e = new CustomEvent<IronKeyboardEventDetail>('keydown', {
+        detail: {keyboardEvent: new KeyboardEvent('keydown'), key: 'x'},
+      });
       flush();
 
       element.viewState.diffMode = DiffViewMode.SIDE_BY_SIDE;
diff --git a/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.ts b/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.ts
index 1052c91..0ce3b07 100644
--- a/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.ts
+++ b/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.ts
@@ -43,7 +43,7 @@
   @property({type: Object})
   serverConfig: ServerInfo | undefined;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
@@ -55,7 +55,7 @@
     ];
   }
 
-  render() {
+  override render() {
     return html` <div class="container">
       <a
         target="_blank"
@@ -73,9 +73,9 @@
         )}</a
       >
       <gr-copy-clipboard
-        hasTooltip=""
-        .buttonTitle="Copy full SHA to clipboard"
-        hideInput=""
+        hastooltip
+        .buttonTitle="${'Copy full SHA to clipboard'}"
+        hideinput
         .text="${this.commitInfo?.commit}"
       >
       </gr-copy-clipboard>
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.ts
index 4fd42b0..07da53f 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.ts
@@ -57,7 +57,7 @@
    */
 
   @property({type: String})
-  message?: string;
+  message = '';
 
   get keyBindings() {
     return {
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_test.js b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_test.js
deleted file mode 100644
index 14d16f5..0000000
--- a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_test.js
+++ /dev/null
@@ -1,62 +0,0 @@
-/**
- * @license
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import '../../../test/common-test-setup-karma.js';
-import './gr-confirm-abandon-dialog.js';
-
-const basicFixture = fixtureFromElement('gr-confirm-abandon-dialog');
-
-suite('gr-confirm-abandon-dialog tests', () => {
-  let element;
-
-  setup(() => {
-    element = basicFixture.instantiate();
-  });
-
-  test('_handleConfirmTap', () => {
-    const confirmHandler = sinon.stub();
-    element.addEventListener('confirm', confirmHandler);
-    sinon.spy(element, '_handleConfirmTap');
-    sinon.spy(element, '_confirm');
-    element.shadowRoot
-        .querySelector('gr-dialog').dispatchEvent(
-            new CustomEvent('confirm', {
-              composed: true, bubbles: true,
-            }));
-    assert.isTrue(confirmHandler.called);
-    assert.isTrue(confirmHandler.calledOnce);
-    assert.isTrue(element._handleConfirmTap.called);
-    assert.isTrue(element._confirm.called);
-    assert.isTrue(element._confirm.calledOnce);
-  });
-
-  test('_handleCancelTap', () => {
-    const cancelHandler = sinon.stub();
-    element.addEventListener('cancel', cancelHandler);
-    sinon.spy(element, '_handleCancelTap');
-    element.shadowRoot
-        .querySelector('gr-dialog').dispatchEvent(
-            new CustomEvent('cancel', {
-              composed: true, bubbles: true,
-            }));
-    assert.isTrue(cancelHandler.called);
-    assert.isTrue(cancelHandler.calledOnce);
-    assert.isTrue(element._handleCancelTap.called);
-    assert.isTrue(element._handleCancelTap.calledOnce);
-  });
-});
-
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_test.ts b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_test.ts
new file mode 100644
index 0000000..08dda14
--- /dev/null
+++ b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog_test.ts
@@ -0,0 +1,66 @@
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import '../../../test/common-test-setup-karma';
+import './gr-confirm-abandon-dialog';
+import {GrConfirmAbandonDialog} from './gr-confirm-abandon-dialog';
+import {queryAndAssert} from '../../../test/test-utils';
+import {GrDialog} from '../../shared/gr-dialog/gr-dialog';
+
+const basicFixture = fixtureFromElement('gr-confirm-abandon-dialog');
+
+suite('gr-confirm-abandon-dialog tests', () => {
+  let element: GrConfirmAbandonDialog;
+
+  setup(() => {
+    element = basicFixture.instantiate();
+  });
+
+  test('_handleConfirmTap', () => {
+    const confirmHandler = sinon.stub();
+    element.addEventListener('confirm', confirmHandler);
+    const confirmTapSpy = sinon.spy(element, '_handleConfirmTap');
+    const confirmSpy = sinon.spy(element, '_confirm');
+    queryAndAssert<GrDialog>(element, 'gr-dialog').dispatchEvent(
+      new CustomEvent('confirm', {
+        composed: true,
+        bubbles: true,
+      })
+    );
+    assert.isTrue(confirmHandler.called);
+    assert.isTrue(confirmHandler.calledOnce);
+    assert.isTrue(confirmTapSpy.called);
+    assert.isTrue(confirmSpy.called);
+    assert.isTrue(confirmSpy.calledOnce);
+  });
+
+  test('_handleCancelTap', () => {
+    const cancelHandler = sinon.stub();
+    element.addEventListener('cancel', cancelHandler);
+    const cancelTapSpy = sinon.spy(element, '_handleCancelTap');
+    queryAndAssert<GrDialog>(element, 'gr-dialog').dispatchEvent(
+      new CustomEvent('cancel', {
+        composed: true,
+        bubbles: true,
+      })
+    );
+    assert.isTrue(cancelHandler.called);
+    assert.isTrue(cancelHandler.calledOnce);
+    assert.isTrue(cancelTapSpy.called);
+    assert.isTrue(cancelTapSpy.calledOnce);
+  });
+});
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts
index fbf57f3..b061043 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts
@@ -25,15 +25,14 @@
 import {appContext} from '../../../services/app-context';
 import {
   ChangeInfo,
-  BranchInfo,
-  RepoName,
   BranchName,
+  RepoName,
   CommitId,
   ChangeInfoId,
 } from '../../../types/common';
 import {ReportingService} from '../../../services/gr-reporting/gr-reporting';
 import {customElement, property, observe} from '@polymer/decorators';
-import {AutocompleteSuggestion} from '../../shared/gr-autocomplete/gr-autocomplete';
+import {GrTypedAutocomplete} from '../../shared/gr-autocomplete/gr-autocomplete';
 import {HttpMethod, ChangeStatus} from '../../../constants/constants';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {fireEvent} from '../../../utils/event-util';
@@ -68,7 +67,7 @@
 
 export interface GrConfirmCherrypickDialog {
   $: {
-    branchInput: HTMLElement;
+    branchInput: GrTypedAutocomplete<BranchName>;
   };
 }
 
@@ -91,7 +90,7 @@
    */
 
   @property({type: String})
-  branch?: BranchName;
+  branch = '' as BranchName;
 
   @property({type: String})
   baseCommit?: string;
@@ -106,7 +105,7 @@
   commitNum?: CommitId;
 
   @property({type: String})
-  message?: string;
+  message = '';
 
   @property({type: String})
   project?: RepoName;
@@ -115,7 +114,7 @@
   changes: ChangeInfo[] = [];
 
   @property({type: Object})
-  _query: (input: string) => Promise<AutocompleteSuggestion[]>;
+  _query?: (input: string) => Promise<{name: BranchName}[]>;
 
   @property({type: Boolean})
   _showCherryPickTopic = false;
@@ -249,7 +248,7 @@
     cherryPickType: CherryPickType,
     duplicateProjectChanges: boolean,
     statuses: Statuses,
-    branch?: BranchName
+    branch: BranchName
   ) {
     if (!branch) return true;
     const duplicateProject =
@@ -398,29 +397,22 @@
     this.$.branchInput.focus();
   }
 
-  _getProjectBranchesSuggestions(
-    input: string
-  ): Promise<AutocompleteSuggestion[]> {
-    if (!this.project) {
-      this.reporting.error(new Error('no project specified'));
-      return Promise.resolve([]);
-    }
+  _getProjectBranchesSuggestions(input: string) {
+    if (!this.project) return Promise.reject(new Error('Missing project'));
     if (input.startsWith('refs/heads/')) {
       input = input.substring('refs/heads/'.length);
     }
     return this.restApiService
       .getRepoBranches(input, this.project, SUGGESTIONS_LIMIT)
-      .then((response: BranchInfo[] | undefined) => {
+      .then(response => {
         if (!response) return [];
-        const branches = [];
+        const branches: Array<{name: BranchName}> = [];
         for (const branchInfo of response) {
-          let branch;
-          if (branchInfo.ref.startsWith('refs/heads/')) {
-            branch = branchInfo.ref.substring('refs/heads/'.length);
-          } else {
-            branch = branchInfo.ref;
+          let name: string = branchInfo.ref;
+          if (name.startsWith('refs/heads/')) {
+            name = name.substring('refs/heads/'.length);
           }
-          branches.push({name: branch});
+          branches.push({name: name as BranchName});
         }
         return branches;
       });
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js
index ff078f0..3df997f8 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js
@@ -115,18 +115,19 @@
         current_revision: 'a',
       },
     ];
-    setup(() => {
+    setup(async () => {
       element.updateChanges(changes);
       element._cherryPickType = CHERRY_PICK_TYPES.TOPIC;
-      flush();
+      await flush();
     });
 
     test('cherry pick topic submit', async () => {
       element.branch = 'master';
+      await flush();
       const executeChangeActionStub = stubRestApi(
           'executeChangeAction').returns(Promise.resolve([]));
       MockInteractions.tap(element.shadowRoot.
-          querySelector('gr-dialog').$.confirm);
+          querySelector('gr-dialog').confirmButton);
       await flush();
       const args = executeChangeActionStub.args[0];
       assert.equal(args[0], 1);
@@ -137,26 +138,29 @@
       assert.isTrue(args[4].allow_empty);
     });
 
-    test('deselecting a change removes it from being cherry picked', () => {
-      const duplicateChangesStub = sinon.stub(element,
-          'containsDuplicateProject');
-      element.branch = 'master';
-      const executeChangeActionStub = stubRestApi(
-          'executeChangeAction').returns(Promise.resolve([]));
-      const checkboxes = element.shadowRoot.querySelectorAll(
-          'input[type="checkbox"]');
-      assert.equal(checkboxes.length, 2);
-      assert.isTrue(checkboxes[0].checked);
-      MockInteractions.tap(checkboxes[0]);
-      MockInteractions.tap(element.shadowRoot.
-          querySelector('gr-dialog').$.confirm);
-      flush();
-      assert.equal(executeChangeActionStub.callCount, 1);
-      assert.isTrue(duplicateChangesStub.called);
-    });
+    test('deselecting a change removes it from being cherry picked',
+        async () => {
+          const duplicateChangesStub = sinon.stub(element,
+              'containsDuplicateProject');
+          element.branch = 'master';
+          await flush();
+          const executeChangeActionStub = stubRestApi(
+              'executeChangeAction').returns(Promise.resolve([]));
+          const checkboxes = element.shadowRoot.querySelectorAll(
+              'input[type="checkbox"]');
+          assert.equal(checkboxes.length, 2);
+          assert.isTrue(checkboxes[0].checked);
+          MockInteractions.tap(checkboxes[0]);
+          MockInteractions.tap(element.shadowRoot.
+              querySelector('gr-dialog').confirmButton);
+          await flush();
+          assert.equal(executeChangeActionStub.callCount, 1);
+          assert.isTrue(duplicateChangesStub.called);
+        });
 
-    test('deselecting all change shows error message', () => {
+    test('deselecting all change shows error message', async () => {
       element.branch = 'master';
+      await flush();
       const executeChangeActionStub = stubRestApi(
           'executeChangeAction').returns(Promise.resolve([]));
       const checkboxes = element.shadowRoot.querySelectorAll(
@@ -165,8 +169,8 @@
       MockInteractions.tap(checkboxes[0]);
       MockInteractions.tap(checkboxes[1]);
       MockInteractions.tap(element.shadowRoot.
-          querySelector('gr-dialog').$.confirm);
-      flush();
+          querySelector('gr-dialog').confirmButton);
+      await flush();
       assert.equal(executeChangeActionStub.callCount, 0);
       assert.equal(element.shadowRoot.querySelector('.error-message').innerText
           , 'No change selected');
@@ -180,8 +184,8 @@
     });
 
     test('submit button is blocked while cherry picks is running', async () => {
-      const confirmButton = element.shadowRoot.querySelector('gr-dialog').$
-          .confirm;
+      const confirmButton = element.shadowRoot.querySelector('gr-dialog')
+          .confirmButton;
       assert.isTrue(confirmButton.hasAttribute('disabled'));
       element.branch = 'b';
       await flush();
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
index c196706..8e6521d 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
@@ -21,15 +21,23 @@
 import {htmlTemplate} from './gr-confirm-move-dialog_html';
 import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {customElement, property} from '@polymer/decorators';
-import {RepoName, BranchName} from '../../../types/common';
-import {AutocompleteSuggestion} from '../../shared/gr-autocomplete/gr-autocomplete';
+import {BranchName, RepoName} from '../../../types/common';
 import {appContext} from '../../../services/app-context';
+import {GrTypedAutocomplete} from '../../shared/gr-autocomplete/gr-autocomplete';
 
 const SUGGESTIONS_LIMIT = 15;
 
 // This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
 const base = KeyboardShortcutMixin(PolymerElement);
 
+// This is used to make sure 'branch'
+// can be typed as BranchName.
+export interface GrConfirmMoveDialog {
+  $: {
+    branchInput: GrTypedAutocomplete<BranchName>;
+  };
+}
+
 @customElement('gr-confirm-move-dialog')
 export class GrConfirmMoveDialog extends base {
   static get template() {
@@ -49,16 +57,16 @@
    */
 
   @property({type: String})
-  branch?: BranchName;
+  branch = '' as BranchName;
 
   @property({type: String})
-  message?: string;
+  message = '';
 
   @property({type: String})
   project?: RepoName;
 
   @property({type: Object})
-  _query: (input: string) => Promise<AutocompleteSuggestion[]>;
+  _query?: (input: string) => Promise<{name: BranchName}[]>;
 
   get keyBindings() {
     return {
@@ -95,9 +103,7 @@
     );
   }
 
-  _getProjectBranchesSuggestions(
-    input: string
-  ): Promise<AutocompleteSuggestion[]> {
+  _getProjectBranchesSuggestions(input: string) {
     if (!this.project) return Promise.reject(new Error('Missing project'));
     if (input.startsWith('refs/heads/')) {
       input = input.substring('refs/heads/'.length);
@@ -105,21 +111,15 @@
     return this.restApiService
       .getRepoBranches(input, this.project, SUGGESTIONS_LIMIT)
       .then(response => {
-        const branches: AutocompleteSuggestion[] = [];
-        let branch;
-        if (response) {
-          response.forEach(value => {
-            if (value.ref.startsWith('refs/heads/')) {
-              branch = value.ref.substring('refs/heads/'.length);
-            } else {
-              branch = value.ref;
-            }
-            branches.push({
-              name: branch,
-            });
-          });
+        if (!response) return [];
+        const branches: Array<{name: BranchName}> = [];
+        for (const branchInfo of response) {
+          let name: string = branchInfo.ref;
+          if (name.startsWith('refs/heads/')) {
+            name = name.substring('refs/heads/'.length);
+          }
+          branches.push({name: name as BranchName});
         }
-
         return branches;
       });
   }
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.ts
similarity index 75%
rename from polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js
rename to polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.ts
index 10844f5..ea5d320 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog_test.ts
@@ -15,35 +15,37 @@
  * limitations under the License.
  */
 
-import '../../../test/common-test-setup-karma.js';
-import './gr-confirm-move-dialog.js';
-import {stubRestApi} from '../../../test/test-utils.js';
+import '../../../test/common-test-setup-karma';
+import './gr-confirm-move-dialog';
+import {GrConfirmMoveDialog} from './gr-confirm-move-dialog';
+import {stubRestApi} from '../../../test/test-utils';
+import {BranchName, GitRef, RepoName} from '../../../types/common';
 
 const basicFixture = fixtureFromElement('gr-confirm-move-dialog');
 
 suite('gr-confirm-move-dialog tests', () => {
-  let element;
+  let element: GrConfirmMoveDialog;
 
   setup(() => {
-    stubRestApi('getRepoBranches').callsFake(input => {
+    stubRestApi('getRepoBranches').callsFake((input: string) => {
       if (input.startsWith('test')) {
         return Promise.resolve([
           {
-            ref: 'refs/heads/test-branch',
+            ref: 'refs/heads/test-branch' as GitRef,
             revision: '67ebf73496383c6777035e374d2d664009e2aa5c',
             can_delete: true,
           },
         ]);
       } else {
-        return Promise.resolve(undefined);
+        return Promise.resolve([]);
       }
     });
     element = basicFixture.instantiate();
-    element.project = 'test-project';
+    element.project = 'test-repo' as RepoName;
   });
 
   test('with updated commit message', () => {
-    element.branch = 'master';
+    element.branch = 'master' as BranchName;
     const myNewMessage = 'updated commit message';
     element.message = myNewMessage;
     flush();
@@ -52,13 +54,15 @@
 
   test('_getProjectBranchesSuggestions empty', async () => {
     const branches = await element._getProjectBranchesSuggestions(
-        'nonexistent');
+      'nonexistent'
+    );
     assert.equal(branches.length, 0);
   });
 
   test('_getProjectBranchesSuggestions non-empty', async () => {
     const branches = await element._getProjectBranchesSuggestions(
-        'test-branch');
+      'test-branch'
+    );
     assert.equal(branches.length, 1);
     assert.equal(branches[0].name, 'test-branch');
   });
@@ -68,4 +72,3 @@
     assert.equal(branches.length, 0);
   });
 });
-
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts
index c705319..9d371d3 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts
@@ -58,7 +58,7 @@
   @property({type: Boolean})
   _initialised = false;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       fontStyles,
@@ -112,8 +112,8 @@
         id="commentList"
         .threads="${this._computeUnresolvedThreads(this.commentThreads)}"
         .change="${this.change}"
-        .change-num="${this.change?._number}"
-        logged-in="true"
+        .changeNum="${this.change?._number}"
+        logged-in
         hide-dropdown
       >
       </gr-thread-list>
@@ -154,7 +154,7 @@
     `;
   }
 
-  render() {
+  override render() {
     return html` <gr-dialog
       id="dialog"
       confirm-label="Continue"
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
index bdc6a43..8aef3c0 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
@@ -44,7 +44,12 @@
 import {DiffViewMode} from '../../../constants/constants';
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {fireEvent} from '../../../utils/event-util';
-import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
+import {
+  KeyboardShortcutMixin,
+  Shortcut,
+  ShortcutSection,
+} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
+import {appContext} from '../../../services/app-context';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -144,6 +149,8 @@
   @property({type: Object})
   revisionInfo?: RevisionInfo;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   setDiffViewMode(mode: DiffViewMode) {
     this.$.modeSelect.setMode(mode);
   }
@@ -217,4 +224,8 @@
     }
     return 'patchInfoOldPatchSet';
   }
+
+  createTitle(shortcutName: Shortcut, section: ShortcutSection) {
+    return this.shortcuts.createTitle(shortcutName, section);
+  }
 }
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
index bceee27..5972393 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
@@ -93,9 +93,7 @@
     }
     .fileViewActions gr-button {
       margin: 0;
-      --gr-button: {
-        padding: 2px 4px;
-      }
+      --gr-button-padding: 2px 4px;
     }
     .editMode .hideOnEdit {
       display: none;
@@ -180,50 +178,50 @@
           hidden$="[[_computePrefsButtonHidden(diffPrefs, diffPrefsDisabled)]]"
           hidden=""
         >
-          <gr-button
-            link=""
-            has-tooltip=""
-            title="Diff preferences"
-            class="prefsButton desktop"
-            on-click="_handlePrefsTap"
-            ><iron-icon icon="gr-icons:settings"></iron-icon
-          ></gr-button>
+          <gr-tooltip-content has-tooltip title="Diff preferences">
+            <gr-button
+              link=""
+              class="prefsButton desktop"
+              on-click="_handlePrefsTap"
+              ><iron-icon icon="gr-icons:settings"></iron-icon
+            ></gr-button>
+          </gr-tooltip-content>
         </span>
         <span class="separator"></span>
       </div>
       <span class="downloadContainer desktop">
-        <gr-button
-          link=""
-          class="download"
+        <gr-tooltip-content
+          has-tooltip
           title="[[createTitle(Shortcut.OPEN_DOWNLOAD_DIALOG,
-                ShortcutSection.ACTIONS)]]"
-          has-tooltip=""
-          on-click="_handleDownloadTap"
-          >Download</gr-button
+                   ShortcutSection.ACTIONS)]]"
         >
+          <gr-button link="" class="download" on-click="_handleDownloadTap"
+            >Download</gr-button
+          >
+        </gr-tooltip-content>
       </span>
       <template
         is="dom-if"
         if="[[_fileListActionsVisible(shownFileCount, _maxFilesForBulkActions)]]"
       >
-        <gr-button
-          id="expandBtn"
-          link=""
+        <gr-tooltip-content
+          has-tooltip
           title="[[createTitle(Shortcut.TOGGLE_ALL_INLINE_DIFFS,
-                ShortcutSection.FILE_LIST)]]"
-          has-tooltip=""
-          on-click="_expandAllDiffs"
-          >Expand All</gr-button
+                  ShortcutSection.FILE_LIST)]]"
         >
-        <gr-button
-          id="collapseBtn"
-          link=""
-          on-click="_collapseAllDiffs"
+          <gr-button id="expandBtn" link="" on-click="_expandAllDiffs"
+            >Expand All</gr-button
+          >
+        </gr-tooltip-content>
+        <gr-tooltip-content
+          has-tooltip
           title="[[createTitle(Shortcut.TOGGLE_ALL_INLINE_DIFFS,
-          ShortcutSection.FILE_LIST)]]"
-          has-tooltip=""
-          >Collapse All</gr-button
+                  ShortcutSection.FILE_LIST)]]"
         >
+          <gr-button id="collapseBtn" link="" on-click="_collapseAllDiffs"
+            >Collapse All</gr-button
+          >
+        </gr-tooltip-content>
       </template>
       <template
         is="dom-if"
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js
index 08e5e3b..c90cfcc 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js
@@ -90,26 +90,26 @@
     assert.isFalse(computeSpy.lastCall.returnValue);
   });
 
-  test('fileViewActions are properly hidden', () => {
+  test('fileViewActions are properly hidden', async () => {
     const actions = element.shadowRoot
         .querySelector('.fileViewActions');
     assert.equal(getComputedStyle(actions).display, 'none');
     element.filesExpanded = FilesExpandedState.SOME;
-    flush();
+    await flush();
     assert.notEqual(getComputedStyle(actions).display, 'none');
     element.filesExpanded = FilesExpandedState.ALL;
-    flush();
+    await flush();
     assert.notEqual(getComputedStyle(actions).display, 'none');
     element.filesExpanded = FilesExpandedState.NONE;
-    flush();
+    await flush();
     assert.equal(getComputedStyle(actions).display, 'none');
   });
 
-  test('expand/collapse buttons are toggled correctly', () => {
+  test('expand/collapse buttons are toggled correctly', async () => {
     // Only the expand button should be visible in the initial state when
     // NO files are expanded.
     element.shownFileCount = 10;
-    flush();
+    await flush();
     const expandBtn = element.shadowRoot.querySelector('#expandBtn');
     const collapseBtn = element.shadowRoot.querySelector('#collapseBtn');
     assert.notEqual(getComputedStyle(expandBtn).display, 'none');
@@ -118,19 +118,19 @@
     // Both expand and collapse buttons should be visible when SOME files are
     // expanded.
     element.filesExpanded = FilesExpandedState.SOME;
-    flush();
+    await flush();
     assert.notEqual(getComputedStyle(expandBtn).display, 'none');
     assert.notEqual(getComputedStyle(collapseBtn).display, 'none');
 
     // Only the collapse button should be visible when ALL files are expanded.
     element.filesExpanded = FilesExpandedState.ALL;
-    flush();
+    await flush();
     assert.equal(getComputedStyle(expandBtn).display, 'none');
     assert.notEqual(getComputedStyle(collapseBtn).display, 'none');
 
     // Only the expand button should be visible when NO files are expanded.
     element.filesExpanded = FilesExpandedState.NONE;
-    flush();
+    await flush();
     assert.notEqual(getComputedStyle(expandBtn).display, 'none');
     assert.equal(getComputedStyle(collapseBtn).display, 'none');
   });
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
index 8d0c203..b78c78f 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import '../../../styles/gr-a11y-styles';
 import '../../../styles/shared-styles';
 import '../../diff/gr-diff-cursor/gr-diff-cursor';
 import '../../diff/gr-diff-host/gr-diff-host';
@@ -49,8 +50,8 @@
 } from '../../../constants/constants';
 import {
   descendedFromClass,
-  getKeyboardEvent,
   isShiftPressed,
+  modifierPressed,
   toggleClass,
 } from '../../../utils/dom-util';
 import {
@@ -77,7 +78,7 @@
 import {GrCursorManager} from '../../shared/gr-cursor-manager/gr-cursor-manager';
 import {PolymerSpliceChange} from '@polymer/polymer/interfaces';
 import {ChangeComments} from '../../diff/gr-comment-api/gr-comment-api';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 import {ParsedChangeInfo, PatchSetFile} from '../../../types/types';
 import {Timing} from '../../../constants/reporting';
 import {RevisionInfo} from '../../shared/revision-info/revision-info';
@@ -226,9 +227,6 @@
   @property({type: Object, notify: true, observer: '_updateDiffPreferences'})
   diffPrefs?: DiffPreferencesInfo;
 
-  @property({type: Boolean})
-  _showInlineDiffs?: boolean;
-
   @property({type: Number, notify: true})
   numFilesShown: number = DEFAULT_NUM_FILES_SHOWN;
 
@@ -358,14 +356,14 @@
 
   private diffCursor = new GrDiffCursor();
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   constructor() {
     super();
     this.fileCursor.scrollMode = ScrollMode.KEEP_VISIBLE;
     this.fileCursor.cursorTargetClass = 'selected';
     this.fileCursor.focusOnMove = true;
-    this.addEventListener('keydown', e =>
-      this._scopedKeydownHandler(e as unknown as CustomKeyboardEvent)
-    );
+    this.addEventListener('keydown', e => this._scopedKeydownHandler(e));
   }
 
   override connectedCallback() {
@@ -435,13 +433,8 @@
    *
    * Context: Issue 7277
    */
-  _scopedKeydownHandler(e: CustomKeyboardEvent) {
-    if (e.keyCode === 13) {
-      // TODO(TS): e is not an instance of CustomKeyboardEvent.
-      // However, to fix it we should fix keyboard-shortcut-mixin first
-      // The keyboard-shortcut-mixin will be updated in a separate change
-      this._handleOpenFile(e as unknown as CustomKeyboardEvent);
-    }
+  _scopedKeydownHandler(e: KeyboardEvent) {
+    if (e.keyCode === 13) this.handleOpenFile(e);
   }
 
   reload() {
@@ -628,8 +621,6 @@
   }
 
   expandAllDiffs() {
-    this._showInlineDiffs = true;
-
     // Find the list of paths that are in the file list, but not in the
     // expanded list.
     const newFiles: PatchSetFile[] = [];
@@ -645,7 +636,6 @@
   }
 
   collapseAllDiffs() {
-    this._showInlineDiffs = false;
     this._expandedFiles = [];
     this.filesExpanded = this._computeExpandedFiles(
       this._expandedFiles.length,
@@ -891,8 +881,8 @@
     return fileData;
   }
 
-  _handleLeftPane(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this._noDiffsExpanded()) {
+  _handleLeftPane(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this._noDiffsExpanded()) {
       return;
     }
 
@@ -900,8 +890,8 @@
     this.diffCursor.moveLeft();
   }
 
-  _handleRightPane(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this._noDiffsExpanded()) {
+  _handleRightPane(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this._noDiffsExpanded()) {
       return;
     }
 
@@ -909,9 +899,9 @@
     this.diffCursor.moveRight();
   }
 
-  _handleToggleInlineDiff(e: CustomKeyboardEvent) {
+  _handleToggleInlineDiff(e: IronKeyboardEvent) {
     if (
-      this.shouldSuppressKeyboardShortcut(e) ||
+      this.shortcuts.shouldSuppress(e) ||
       this.modifierPressed(e) ||
       e.detail?.keyboardEvent?.repeat ||
       this.fileCursor.index === -1
@@ -923,11 +913,8 @@
     this._toggleFileExpandedByIndex(this.fileCursor.index);
   }
 
-  _handleToggleAllInlineDiffs(e: CustomKeyboardEvent) {
-    if (
-      this.shouldSuppressKeyboardShortcut(e) ||
-      e.detail?.keyboardEvent?.repeat
-    ) {
+  _handleToggleAllInlineDiffs(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || e.detail?.keyboardEvent?.repeat) {
       return;
     }
 
@@ -935,8 +922,8 @@
     this._toggleInlineDiffs();
   }
 
-  _handleToggleHideAllCommentThreads(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleToggleHideAllCommentThreads(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -944,18 +931,18 @@
     toggleClass(this, 'hideComments');
   }
 
-  _handleCursorNext(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleCursorNext(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
-    if (this._showInlineDiffs) {
+    if (this.filesExpanded === FilesExpandedState.ALL) {
       e.preventDefault();
       this.diffCursor.moveDown();
       this._displayLine = true;
     } else {
       // Down key
-      if (getKeyboardEvent(e).keyCode === 40) {
+      if (e.detail.keyboardEvent.keyCode === 40) {
         return;
       }
       e.preventDefault();
@@ -964,18 +951,18 @@
     }
   }
 
-  _handleCursorPrev(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleCursorPrev(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
-    if (this._showInlineDiffs) {
+    if (this.filesExpanded === FilesExpandedState.ALL) {
       e.preventDefault();
       this.diffCursor.moveUp();
       this._displayLine = true;
     } else {
       // Up key
-      if (getKeyboardEvent(e).keyCode === 38) {
+      if (e.detail.keyboardEvent.keyCode === 38) {
         return;
       }
       e.preventDefault();
@@ -984,8 +971,8 @@
     }
   }
 
-  _handleNewComment(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleNewComment(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
     e.preventDefault();
@@ -993,9 +980,9 @@
     this.diffCursor.createCommentInPlace();
   }
 
-  _handleOpenLastFile(e: CustomKeyboardEvent) {
+  _handleOpenLastFile(e: IronKeyboardEvent) {
     // Check for meta key to avoid overriding native chrome shortcut.
-    if (this.shouldSuppressKeyboardShortcut(e) || getKeyboardEvent(e).metaKey) {
+    if (this.shortcuts.shouldSuppress(e) || e.detail.keyboardEvent.metaKey) {
       return;
     }
 
@@ -1003,9 +990,9 @@
     this._openSelectedFile(this._files.length - 1);
   }
 
-  _handleOpenFirstFile(e: CustomKeyboardEvent) {
+  _handleOpenFirstFile(e: IronKeyboardEvent) {
     // Check for meta key to avoid overriding native chrome shortcut.
-    if (this.shouldSuppressKeyboardShortcut(e) || getKeyboardEvent(e).metaKey) {
+    if (this.shortcuts.shouldSuppress(e) || e.detail.keyboardEvent.metaKey) {
       return;
     }
 
@@ -1013,13 +1000,18 @@
     this._openSelectedFile(0);
   }
 
-  _handleOpenFile(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleOpenFile(e: IronKeyboardEvent) {
+    if (this.modifierPressed(e)) return;
+    this.handleOpenFile(e.detail.keyboardEvent);
+  }
+
+  handleOpenFile(e: KeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || modifierPressed(e)) {
       return;
     }
     e.preventDefault();
 
-    if (this._showInlineDiffs) {
+    if (this.filesExpanded === FilesExpandedState.ALL) {
       this._openCursorFile();
       return;
     }
@@ -1027,9 +1019,9 @@
     this._openSelectedFile();
   }
 
-  _handleNextChunk(e: CustomKeyboardEvent) {
+  _handleNextChunk(e: IronKeyboardEvent) {
     if (
-      this.shouldSuppressKeyboardShortcut(e) ||
+      this.shortcuts.shouldSuppress(e) ||
       (this.modifierPressed(e) && !isShiftPressed(e)) ||
       this._noDiffsExpanded()
     ) {
@@ -1044,9 +1036,9 @@
     }
   }
 
-  _handlePrevChunk(e: CustomKeyboardEvent) {
+  _handlePrevChunk(e: IronKeyboardEvent) {
     if (
-      this.shouldSuppressKeyboardShortcut(e) ||
+      this.shortcuts.shouldSuppress(e) ||
       (this.modifierPressed(e) && !isShiftPressed(e)) ||
       this._noDiffsExpanded()
     ) {
@@ -1061,8 +1053,8 @@
     }
   }
 
-  _handleToggleFileReviewed(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleToggleFileReviewed(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
 
@@ -1073,8 +1065,8 @@
     this._reviewFile(this._files[this.fileCursor.index].__path);
   }
 
-  _handleToggleLeftPane(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleToggleLeftPane(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
 
@@ -1085,7 +1077,7 @@
   }
 
   _toggleInlineDiffs() {
-    if (this._showInlineDiffs) {
+    if (this.filesExpanded === FilesExpandedState.ALL) {
       this.collapseAllDiffs();
     } else {
       this.expandAllDiffs();
@@ -1550,8 +1542,8 @@
     return undefined;
   }
 
-  _handleEscKey(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e) || this.modifierPressed(e)) {
+  _handleEscKey(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e) || this.modifierPressed(e)) {
       return;
     }
     e.preventDefault();
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
index 4d04744..f7be36b 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-a11y-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       display: block;
@@ -253,9 +256,7 @@
       display: inline-block;
       visibility: hidden;
       vertical-align: bottom;
-      --gr-button: {
-        padding: 0px;
-      }
+      --gr-button-padding: 0px;
     }
     .row:focus-within gr-copy-clipboard,
     .row:hover gr-copy-clipboard {
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_test.js b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_test.js
index 5def25a..f4064da 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_test.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_test.js
@@ -17,6 +17,7 @@
 
 import '../../../test/common-test-setup-karma.js';
 import '../../diff/gr-comment-api/gr-comment-api.js';
+import '../../shared/gr-date-formatter/gr-date-formatter.js';
 import {getMockDiffResponse} from '../../../test/mocks/diff-response.js';
 import './gr-file-list.js';
 import {createCommentApiMockWithTemplateElement} from '../../../test/mocks/comment-api.js';
@@ -26,7 +27,6 @@
 import {runA11yAudit} from '../../../test/a11y-test-utils.js';
 import {html} from '@polymer/polymer/lib/utils/html-tag.js';
 import {
-  TestKeyboardShortcutBinder,
   stubRestApi,
   spyRestApi,
   listenOnce,
@@ -34,7 +34,6 @@
   query,
 } from '../../../test/test-utils.js';
 import {EditPatchSetNum} from '../../../types/common.js';
-import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
 import {createCommentThreads} from '../../../utils/comment-util.js';
 import {
   createChange,
@@ -67,30 +66,6 @@
 
   let saveStub;
 
-  suiteSetup(() => {
-    const kb = TestKeyboardShortcutBinder.push();
-    kb.bindShortcut(Shortcut.LEFT_PANE, 'shift+left');
-    kb.bindShortcut(Shortcut.RIGHT_PANE, 'shift+right');
-    kb.bindShortcut(Shortcut.TOGGLE_INLINE_DIFF, 'i:keyup');
-    kb.bindShortcut(Shortcut.TOGGLE_ALL_INLINE_DIFFS, 'shift+i:keyup');
-    kb.bindShortcut(Shortcut.CURSOR_NEXT_FILE, 'j', 'down');
-    kb.bindShortcut(Shortcut.CURSOR_PREV_FILE, 'k', 'up');
-    kb.bindShortcut(Shortcut.NEXT_LINE, 'j', 'down');
-    kb.bindShortcut(Shortcut.PREV_LINE, 'k', 'up');
-    kb.bindShortcut(Shortcut.NEW_COMMENT, 'c');
-    kb.bindShortcut(Shortcut.OPEN_LAST_FILE, '[');
-    kb.bindShortcut(Shortcut.OPEN_FIRST_FILE, ']');
-    kb.bindShortcut(Shortcut.OPEN_FILE, 'o');
-    kb.bindShortcut(Shortcut.NEXT_CHUNK, 'n');
-    kb.bindShortcut(Shortcut.PREV_CHUNK, 'p');
-    kb.bindShortcut(Shortcut.TOGGLE_FILE_REVIEWED, 'r');
-    kb.bindShortcut(Shortcut.TOGGLE_LEFT_PANE, 'shift+a');
-  });
-
-  suiteTeardown(() => {
-    TestKeyboardShortcutBinder.pop();
-  });
-
   suite('basic tests', () => {
     setup(async () => {
       stubRestApi('getDiffComments').returns(Promise.resolve({}));
@@ -565,35 +540,36 @@
         assert.equal(element.diffs.length, 0);
         assert.equal(element._expandedFiles.length, 0);
 
-        MockInteractions.keyUpOn(element, 73, null, 'i');
+        MockInteractions.pressAndReleaseKeyOn(element, 73, null, 'i');
         flush();
         assert.equal(element.diffs.length, 1);
         assert.equal(element.diffs[0].path, paths[0]);
         assert.equal(element._expandedFiles.length, 1);
         assert.equal(element._expandedFiles[0].path, paths[0]);
 
-        MockInteractions.keyUpOn(element, 73, null, 'i');
+        MockInteractions.pressAndReleaseKeyOn(element, 73, null, 'i');
         flush();
         assert.equal(element.diffs.length, 0);
         assert.equal(element._expandedFiles.length, 0);
 
         element.fileCursor.setCursorAtIndex(1);
-        MockInteractions.keyUpOn(element, 73, null, 'i');
+        MockInteractions.pressAndReleaseKeyOn(element, 73, null, 'i');
         flush();
         assert.equal(element.diffs.length, 1);
         assert.equal(element.diffs[0].path, paths[1]);
         assert.equal(element._expandedFiles.length, 1);
         assert.equal(element._expandedFiles[0].path, paths[1]);
 
-        MockInteractions.keyUpOn(element, 73, 'shift', 'i');
+        MockInteractions.pressAndReleaseKeyOn(element, 73, 'shift', 'i');
         flush();
         assert.equal(element.diffs.length, paths.length);
         assert.equal(element._expandedFiles.length, paths.length);
         for (const diff of element.diffs) {
           assert.isTrue(element._expandedFiles.some(f => f.path === diff.path));
         }
-
-        MockInteractions.keyUpOn(element, 73, 'shift', 'i');
+        // since _expandedFilesChanged is stubbed
+        element.filesExpanded = FilesExpandedState.ALL;
+        MockInteractions.pressAndReleaseKeyOn(element, 73, 'shift', 'i');
         flush();
         assert.equal(element.diffs.length, 0);
         assert.equal(element._expandedFiles.length, 0);
@@ -608,12 +584,12 @@
         assert.equal(getNumReviewed(), 0);
 
         // Press the review key to toggle it (set the flag).
-        MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+        MockInteractions.keyUpOn(element, 82, null, 'r');
         flush();
         assert.equal(getNumReviewed(), 1);
 
         // Press the review key to toggle it (clear the flag).
-        MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+        MockInteractions.keyUpOn(element, 82, null, 'r');
         assert.equal(getNumReviewed(), 0);
       });
 
@@ -621,22 +597,23 @@
         let interact;
 
         setup(() => {
-          sinon.stub(element, 'shouldSuppressKeyboardShortcut')
-              .returns(false);
           sinon.stub(element, 'modifierPressed').returns(false);
           const openCursorStub = sinon.stub(element, '_openCursorFile');
           const openSelectedStub = sinon.stub(element, '_openSelectedFile');
           const expandStub = sinon.stub(element, '_toggleFileExpanded');
 
-          interact = function(opt_payload) {
+          interact = function() {
             openCursorStub.reset();
             openSelectedStub.reset();
             expandStub.reset();
 
-            const e = new CustomEvent('fake-keyboard-event', opt_payload);
-            sinon.stub(e, 'preventDefault');
+            const keyboardEvent = new KeyboardEvent('keydown');
+            const e = new CustomEvent('keydown', {
+              detail: {keyboardEvent, key: 'x'},
+            });
+            sinon.stub(keyboardEvent, 'preventDefault');
             element._handleOpenFile(e);
-            assert.isTrue(e.preventDefault.called);
+            assert.isTrue(keyboardEvent.preventDefault.called);
             const result = {};
             if (openCursorStub.called) {
               result.opened_cursor = true;
@@ -652,17 +629,17 @@
         });
 
         test('open from selected file', () => {
-          element._showInlineDiffs = false;
+          element.filesExpanded = FilesExpandedState.NONE;
           assert.deepEqual(interact(), {opened_selected: true});
         });
 
         test('open from diff cursor', () => {
-          element._showInlineDiffs = true;
+          element.filesExpanded = FilesExpandedState.ALL;
           assert.deepEqual(interact(), {opened_cursor: true});
         });
 
         test('expand when user prefers', () => {
-          element._showInlineDiffs = false;
+          element.filesExpanded = FilesExpandedState.NONE;
           assert.deepEqual(interact(), {opened_selected: true});
           element._userPrefs = {};
           assert.deepEqual(interact(), {opened_selected: true});
@@ -928,14 +905,14 @@
       element._filesByPath = {[path]: {}};
       element.expandAllDiffs();
       flush();
-      assert.isTrue(element._showInlineDiffs);
+      assert.equal(element.filesExpanded, FilesExpandedState.ALL);
       assert.isTrue(reInitStub.calledOnce);
       assert.equal(collapseStub.lastCall.args[0].length, 0);
 
       element.collapseAllDiffs();
       flush();
       assert.equal(element._expandedFiles.length, 0);
-      assert.isFalse(element._showInlineDiffs);
+      assert.equal(element.filesExpanded, FilesExpandedState.NONE);
       assert.isTrue(cursorUpdateStub.calledOnce);
       assert.equal(collapseStub.lastCall.args[0].length, 1);
     });
@@ -1572,7 +1549,7 @@
     });
 
     test('cursor with individually opened files', async () => {
-      MockInteractions.keyUpOn(element, 73, null, 'i');
+      MockInteractions.pressAndReleaseKeyOn(element, 73, null, 'i');
       await flush();
       let diffs = await renderAndGetNewDiffs(0);
       const diffStops = diffs[0].getCursorStops();
@@ -1599,7 +1576,7 @@
       // The file cursor is now at 1.
       assert.equal(element.fileCursor.index, 1);
 
-      MockInteractions.keyUpOn(element, 73, null, 'i');
+      MockInteractions.pressAndReleaseKeyOn(element, 73, null, 'i');
       await flush();
       diffs = await renderAndGetNewDiffs(1);
 
@@ -1614,7 +1591,7 @@
     });
 
     test('cursor with toggle all files', async () => {
-      MockInteractions.keyUpOn(element, 73, 'shift', 'i');
+      MockInteractions.pressAndReleaseKeyOn(element, 73, 'shift', 'i');
       await flush();
 
       const diffs = await renderAndGetNewDiffs(0);
@@ -1661,7 +1638,7 @@
       });
 
       test('n key with some files expanded and no shift key', async () => {
-        MockInteractions.keyUpOn(fileRows[0], 73, null, 'i');
+        MockInteractions.pressAndReleaseKeyOn(fileRows[0], 73, null, 'i');
         await flush();
 
         // Handle N key should return before calling diff cursor functions.
@@ -1675,7 +1652,7 @@
       });
 
       test('n key with some files expanded and shift key', async () => {
-        MockInteractions.keyUpOn(fileRows[0], 73, null, 'i');
+        MockInteractions.pressAndReleaseKeyOn(fileRows[0], 73, null, 'i');
         await flush();
         assert.equal(nextChunkStub.callCount, 0);
 
@@ -1689,7 +1666,7 @@
       });
 
       test('n key without all files expanded and shift key', async () => {
-        MockInteractions.keyUpOn(fileRows[0], 73, 'shift', 'i');
+        MockInteractions.pressAndReleaseKeyOn(fileRows[0], 73, 'shift', 'i');
         await flush();
 
         MockInteractions.pressAndReleaseKeyOn(element, 78, null, 'n');
@@ -1698,11 +1675,11 @@
 
         // This is also called in diffCursor.moveToFirstChunk.
         assert.equal(nextChunkStub.callCount, 1);
-        assert.isTrue(element._showInlineDiffs);
+        assert.equal(element.filesExpanded, FilesExpandedState.ALL);
       });
 
       test('n key without all files expanded and no shift key', async () => {
-        MockInteractions.keyUpOn(fileRows[0], 73, 'shift', 'i');
+        MockInteractions.pressAndReleaseKeyOn(fileRows[0], 73, 'shift', 'i');
         await flush();
 
         MockInteractions.pressAndReleaseKeyOn(element, 78, 'shift', 'n');
@@ -1711,7 +1688,7 @@
 
         // This is also called in diffCursor.moveToFirstChunk.
         assert.equal(nextChunkStub.callCount, 0);
-        assert.isTrue(element._showInlineDiffs);
+        assert.equal(element.filesExpanded, FilesExpandedState.ALL);
       });
     });
 
@@ -1731,12 +1708,13 @@
     });
 
     test('_displayLine', () => {
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut')
-          .callsFake(() => false);
       sinon.stub(element, 'modifierPressed')
           .callsFake(() => false);
-      element._showInlineDiffs = true;
-      const mockEvent = {preventDefault() {}};
+      element.filesExpanded = FilesExpandedState.ALL;
+      const mockEvent = {
+        preventDefault() {},
+        composedPath() { return []; },
+      };
 
       element._displayLine = false;
       element._handleCursorNext(mockEvent);
@@ -1757,13 +1735,13 @@
         const saveReviewStub = sinon.stub(element, '_saveReviewedState');
 
         element.editMode = false;
-        MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+        MockInteractions.keyUpOn(element, 82, null, 'r');
         assert.isTrue(saveReviewStub.calledOnce);
 
         element.editMode = true;
         await flush();
 
-        MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+        MockInteractions.keyUpOn(element, 82, null, 'r');
         assert.isTrue(saveReviewStub.calledOnce);
       });
 
diff --git a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts
index f9d21d9..0af2f36 100644
--- a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_html.ts
@@ -53,25 +53,27 @@
       );
       padding: 0 var(--spacing-m);
     }
-    gr-button.iron-selected[vote='max'] {
+    gr-tooltip-content.iron-selected > gr-button[vote='max'] {
       --button-background-color: var(--vote-color-approved);
     }
-    gr-button.iron-selected[vote='positive'] {
+    gr-tooltip-content.iron-selected > gr-buttonvote='positive'] {
       --button-background-color: var(--vote-color-recommended);
     }
-    gr-button.iron-selected[vote='min'] {
+    gr-tooltip-content.iron-selected > gr-button[vote='min'] {
       --button-background-color: var(--vote-color-rejected);
     }
-    gr-button.iron-selected[vote='negative'] {
+    gr-tooltip-content.iron-selected > gr-button[vote='negative'] {
       --button-background-color: var(--vote-color-disliked);
     }
-    gr-button.iron-selected[vote='neutral'] {
+    gr-tooltip-content.iron-selected > gr-button[vote='neutral'] {
       --button-background-color: var(--vote-color-neutral);
     }
-    gr-button.iron-selected[vote='positive']::part(paper-button) {
+    gr-tooltip-content.iron-selected
+      > gr-button[vote='positive']::part(paper-button) {
       border-color: var(--vote-outline-recommended);
     }
-    gr-button.iron-selected[vote='negative']::part(paper-button) {
+    gr-tooltip-content.iron-selected
+      > gr-button[vote='negative']::part(paper-button) {
       border-color: var(--vote-outline-disliked);
     }
     .placeholder {
@@ -116,17 +118,20 @@
       aria-labelledby="labelName"
     >
       <template is="dom-repeat" items="[[_items]]" as="value">
-        <gr-button
-          role="radio"
-          vote$="[[_computeVoteAttribute(value, index, _items.length)]]"
-          vote-chip
-          has-tooltip=""
+        <gr-tooltip-content
+          has-tooltip
+          title$="[[_computeLabelValueTitle(labels, label.name, value)]]"
           data-name$="[[label.name]]"
           data-value$="[[value]]"
-          title$="[[_computeLabelValueTitle(labels, label.name, value)]]"
         >
-          [[value]]</gr-button
-        >
+          <gr-button
+            role="radio"
+            vote$="[[_computeVoteAttribute(value, index, _items.length)]]"
+            voteChip
+          >
+            [[value]]
+          </gr-button>
+        </gr-tooltip-content>
       </template>
     </iron-selector>
     <template
diff --git a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_test.js b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_test.js
index e7ff236..34e959b 100644
--- a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_test.js
+++ b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row_test.js
@@ -97,14 +97,14 @@
     }
   }
 
-  test('label picker', () => {
+  test('label picker', async () => {
     const labelsChangedHandler = sinon.stub();
     element.addEventListener('labels-changed', labelsChangedHandler);
     assert.ok(element.$.labelSelector);
     MockInteractions.tap(element.shadowRoot
         .querySelector(
-            'gr-button[data-value="-1"]'));
-    flush();
+            'gr-tooltip-content[data-value="-1"] > gr-button'));
+    await flush();
     assert.strictEqual(element.selectedValue, '-1');
     assert.strictEqual(element.selectedItem
         .textContent.trim(), '-1');
@@ -160,26 +160,6 @@
     checkAriaCheckedValid();
   });
 
-  test('do not display tooltips on touch devices', () => {
-    const verifiedBtn = element.shadowRoot
-        .querySelector(
-            'iron-selector > gr-button[data-value="-1"]');
-
-    // On touch devices, tooltips should not be shown.
-    verifiedBtn._isTouchDevice = true;
-    verifiedBtn._handleShowTooltip();
-    assert.isNotOk(verifiedBtn._tooltip);
-    verifiedBtn._handleHideTooltip();
-    assert.isNotOk(verifiedBtn._tooltip);
-
-    // On other devices, tooltips should be shown.
-    verifiedBtn._isTouchDevice = false;
-    verifiedBtn._handleShowTooltip();
-    assert.isOk(verifiedBtn._tooltip);
-    verifiedBtn._handleHideTooltip();
-    assert.isNotOk(verifiedBtn._tooltip);
-  });
-
   test('_computeLabelValue', () => {
     assert.strictEqual(element._computeLabelValue(element.labels,
         element.permittedLabels,
@@ -209,7 +189,7 @@
         'Code-Review'), []);
   });
 
-  test('changes in label score are reflected in the DOM', () => {
+  test('changes in label score are reflected in the DOM', async () => {
     element.labels = {
       'Code-Review': {
         values: {
@@ -232,9 +212,10 @@
         default_value: 0,
       },
     };
+    await flush();
     const selector = element.$.labelSelector;
     element.set('label', {name: 'Verified', value: ' 0'});
-    flush();
+    await flush();
     assert.strictEqual(selector.selected, ' 0');
     assert.strictEqual(
         element.$.selectedValueLabel.textContent.trim(), 'No score');
diff --git a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_test.ts b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_test.ts
index cfecf91..f529464 100644
--- a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores_test.ts
@@ -85,7 +85,7 @@
     await flush();
   });
 
-  test('get and set label scores', () => {
+  test('get and set label scores', async () => {
     for (const label of Object.keys(element.permittedLabels!)) {
       const row = queryAndAssert<GrLabelScoreRow>(
         element,
@@ -93,6 +93,7 @@
       );
       row.setSelectedValue('-1');
     }
+    await flush();
     assert.deepEqual(element.getLabelValues(), {
       'Code-Review': -1,
       Verified: -1,
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message.ts b/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
index b4e85a9..95e4301 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
@@ -209,7 +209,7 @@
     this.addEventListener('click', e => this._handleClick(e));
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     this.restApiService.getConfig().then(config => {
       this.config = config;
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
index ddbd22e..7f3e9de 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
@@ -132,7 +132,7 @@
     }
     .dateContainer .patchsetDiffButton {
       margin-right: var(--spacing-m);
-      --padding: 0 var(--spacing-m);
+      --gr-button-padding: 0 var(--spacing-m);
     }
     span.date {
       color: var(--deemphasized-text-color);
@@ -325,8 +325,8 @@
         <template is="dom-if" if="[[!message.id]]">
           <span class="date">
             <gr-date-formatter
-              has-tooltip=""
-              show-date-and-time=""
+              withTooltip
+              showDateAndTime
               date-str="[[message.date]]"
             ></gr-date-formatter>
           </span>
@@ -334,8 +334,8 @@
         <template is="dom-if" if="[[message.id]]">
           <span class="date" on-click="_handleAnchorClick">
             <gr-date-formatter
-              has-tooltip=""
-              show-date-and-time=""
+              withTooltip
+              showDateAndTime
               date-str="[[message.date]]"
             ></gr-date-formatter>
           </span>
diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts
index fdd7c79..cd79bba 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts
@@ -257,6 +257,8 @@
 
   private readonly reporting = appContext.reportingService;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   scrollToMessage(messageID: string) {
     const selector = `[data-message-id="${messageID}"]`;
     const el = this.shadowRoot!.querySelector(selector) as
@@ -384,13 +386,13 @@
 
   _computeExpandAllTitle(_expandAllState?: string) {
     if (_expandAllState === ExpandAllState.COLLAPSE_ALL) {
-      return this.createTitle(
+      return this.shortcuts.createTitle(
         Shortcut.COLLAPSE_ALL_MESSAGES,
         ShortcutSection.ACTIONS
       );
     }
     if (_expandAllState === ExpandAllState.EXPAND_ALL) {
-      return this.createTitle(
+      return this.shortcuts.createTitle(
         Shortcut.EXPAND_ALL_MESSAGES,
         ShortcutSection.ACTIONS
       );
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-change.ts b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-change.ts
index d34600e..e4703df 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-change.ts
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-change.ts
@@ -24,6 +24,7 @@
 } from '../../../types/common';
 import {ChangeStatus} from '../../../constants/constants';
 import {isChangeInfo} from '../../../utils/change-util';
+import {ifDefined} from 'lit/directives/if-defined';
 
 @customElement('gr-related-change')
 export class GrRelatedChange extends LitElement {
@@ -109,7 +110,7 @@
     const linkClass = this._computeLinkClass(change);
     return html`
       <div class="changeContainer">
-        <a href="${this.href}" class="${linkClass}"><slot></slot></a>
+        <a href="${ifDefined(this.href)}" class="${linkClass}"><slot></slot></a>
         ${this.showSubmittableCheck
           ? html`<span
               tabindex="-1"
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts
index 74f20f2..bce4024 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts
@@ -40,6 +40,7 @@
   isChangeInfo,
 } from '../../../utils/change-util';
 import {Interaction} from '../../../constants/reporting';
+import {fontStyles} from '../../../styles/gr-font-styles';
 
 /** What is the maximum number of shown changes in collapsed list? */
 const DEFALT_NUM_CHANGES_WHEN_COLLAPSED = 3;
@@ -686,9 +687,9 @@
   static override get styles() {
     return [
       sharedStyles,
+      fontStyles,
       css`
         .title {
-          font-weight: var(--font-weight-bold);
           color: var(--deemphasized-text-color);
           padding-left: var(--metadata-horizontal-padding);
         }
@@ -720,7 +721,7 @@
   }
 
   override render() {
-    const title = html`<h4 class="title">${this.title}</h4>`;
+    const title = html`<h3 class="title heading-3">${this.title}</h3>`;
 
     const collapsible = this.length > this.numChangesWhenCollapsed;
     this.collapsed = !this.showAll && collapsible;
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog-it_test.js b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog-it_test.js
index 933cb82..b8c9319 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog-it_test.js
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog-it_test.js
@@ -127,7 +127,7 @@
     const labelScoreRows = element.getLabelScores().shadowRoot
         .querySelector('gr-label-score-row[name="Code-Review"]');
     const selectedBtn = labelScoreRows.shadowRoot
-        .querySelector('gr-button[data-value="+1"].iron-selected');
+        .querySelector('gr-tooltip-content[data-value="+1"] > gr-button');
     assert.isOk(selectedBtn);
   });
 });
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
index b571985..0beb91c 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
@@ -177,7 +177,7 @@
     }
     .attention .edit-attention-button {
       vertical-align: top;
-      --padding: 0px 4px;
+      --gr-button-padding: 0px 4px;
     }
     .attention .edit-attention-button iron-icon {
       color: inherit;
@@ -441,23 +441,26 @@
                 ></gr-account-label>
               </template>
             </template>
-            <gr-button
-              class="edit-attention-button"
-              on-click="_handleAttentionModify"
-              disabled="[[_sendDisabled]]"
-              link=""
-              position-below=""
-              data-label="Edit"
-              data-action-type="change"
-              data-action-key="edit"
-              has-tooltip=""
+            <gr-tooltip-content
+              has-tooltip
               title="[[_computeAttentionButtonTitle(_sendDisabled)]]"
-              role="button"
-              tabindex="0"
             >
-              <iron-icon icon="gr-icons:edit"></iron-icon>
-              Modify
-            </gr-button>
+              <gr-button
+                class="edit-attention-button"
+                on-click="_handleAttentionModify"
+                disabled="[[_sendDisabled]]"
+                link=""
+                position-below=""
+                data-label="Edit"
+                data-action-type="change"
+                data-action-key="edit"
+                role="button"
+                tabindex="0"
+              >
+                <iron-icon icon="gr-icons:edit"></iron-icon>
+                Modify
+              </gr-button>
+            </gr-tooltip-content>
           </div>
           <div>
             <a
@@ -612,26 +615,32 @@
             <!-- Use 'Send' here as the change may only about reviewers / ccs
                 and when this button is visible, the next button will always
                 be 'Start review' -->
-            <gr-button
-              link=""
-              disabled="[[_isState(knownLatestState, 'not-latest')]]"
-              class="action save"
+            <gr-tooltip-content
               has-tooltip=""
-              title="[[_saveTooltip]]"
-              on-click="_saveClickHandler"
-              >Send As WIP</gr-button
+              title$="[[_saveTooltip]]"
             >
+              <gr-button
+                link=""
+                disabled="[[_isState(knownLatestState, 'not-latest')]]"
+                class="action save"
+                on-click="_saveClickHandler"
+                >Send As WIP</gr-button
+              >
+            </gr-tooltip-content>
           </template>
-          <gr-button
-            id="sendButton"
-            primary=""
-            disabled="[[_sendDisabled]]"
-            class="action send"
+          <gr-tooltip-content
             has-tooltip=""
             title$="[[_computeSendButtonTooltip(canBeStarted, _commentEditing)]]"
-            on-click="_sendTapHandler"
-            >[[_sendButtonLabel]]</gr-button
           >
+            <gr-button
+              id="sendButton"
+              primary=""
+              disabled="[[_sendDisabled]]"
+              class="action send"
+              on-click="_sendTapHandler"
+              >[[_sendButtonLabel]]
+            </gr-button>
+          </gr-tooltip-content>
         </div>
       </section>
     </div>
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts
index e3bbd9e..e57ffc7 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.ts
@@ -116,7 +116,7 @@
     return {id: `${lastId++}` as GroupId};
   };
 
-  setup(() => {
+  setup(async () => {
     changeNum = 42 as NumericChangeId;
     patchNum = 1 as PatchSetNum;
 
@@ -168,7 +168,7 @@
     //     .returns(Promise.resolve({isLatest: true}));
 
     // Allow the elements created by dom-repeat to be stamped.
-    flush();
+    await flush();
   });
 
   function stubSaveReview(
@@ -216,6 +216,7 @@
     // which the dom-repeat elements are stamped.
     await flush();
     tap(queryAndAssert(element, '.send'));
+    await flush();
 
     const review = await saveReviewPromise;
     assert.deepEqual(review, {
@@ -1063,6 +1064,7 @@
     const label = 'Verified';
     const value = '+1';
     element.setLabelValue(label, value);
+    await flush();
 
     const labels = (
       queryAndAssert(element, '#labelScores') as GrLabelScores
diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
index b081be7..dec65e2 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
@@ -42,15 +42,13 @@
       display: inline-block;
     }
     gr-button.addReviewer {
-      --padding: 1px 4px;
+      --gr-button-padding: 1px 0px;
       vertical-align: top;
       top: 1px;
     }
     gr-button {
       line-height: var(--line-height-normal);
-      --gr-button: {
-        padding: 0px 0px;
-      }
+      --gr-button-padding: 0px;
     }
     gr-account-chip {
       line-height: var(--line-height-normal);
@@ -60,6 +58,7 @@
     gr-vote-chip {
       --gr-vote-chip-width: 14px;
       --gr-vote-chip-height: 14px;
+      margin-right: var(--spacing-s);
     }
   </style>
   <div class="container">
diff --git a/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard.ts b/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard.ts
index f636df3..3c9f54c 100644
--- a/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard.ts
+++ b/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard.ts
@@ -14,18 +14,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../../styles/gr-font-styles';
-import '../../shared/gr-hovercard/gr-hovercard-shared-style';
 import '../../shared/gr-button/gr-button';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {customElement, property} from '@polymer/decorators';
-import {HovercardBehaviorMixin} from '../../shared/gr-hovercard/gr-hovercard-behavior';
-import {htmlTemplate} from './gr-submit-requirement-hovercard_html';
+import '../../shared/gr-label-info/gr-label-info';
+import '../../shared/gr-limited-text/gr-limited-text';
+import {customElement, property} from 'lit/decorators';
 import {
   AccountInfo,
   SubmitRequirementExpressionInfo,
   SubmitRequirementResultInfo,
-  SubmitRequirementStatus,
 } from '../../../api/rest-api';
 import {
   extractAssociatedLabels,
@@ -33,16 +29,15 @@
 } from '../../../utils/label-util';
 import {ParsedChangeInfo} from '../../../types/types';
 import {Label} from '../gr-change-requirements/gr-change-requirements';
+import {css, html, LitElement} from 'lit';
+import {HovercardMixin} from '../../../mixins/hovercard-mixin/hovercard-mixin';
+import {fontStyles} from '../../../styles/gr-font-styles';
 
 // This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = HovercardBehaviorMixin(PolymerElement);
+const base = HovercardMixin(LitElement);
 
 @customElement('gr-submit-requirement-hovercard')
 export class GrHovercardRun extends base {
-  static get template() {
-    return htmlTemplate;
-  }
-
   @property({type: Object})
   requirement?: SubmitRequirementResultInfo;
 
@@ -53,21 +48,181 @@
   account?: AccountInfo;
 
   @property({type: Boolean})
-  mutable?: boolean;
+  mutable = false;
 
   @property({type: Boolean})
   expanded = false;
 
-  @property({type: Array, computed: 'computeLabels(change, requirement)'})
-  _labels: Label[] = [];
+  static override get styles() {
+    return [
+      fontStyles,
+      base.styles || [],
+      css`
+        #container {
+          min-width: 356px;
+          max-width: 356px;
+          padding: var(--spacing-xl) 0 var(--spacing-m) 0;
+        }
+        section.label {
+          display: table-row;
+        }
+        .label-title {
+          min-width: 10em;
+          padding-top: var(--spacing-s);
+        }
+        .label-value {
+          padding-top: var(--spacing-s);
+        }
+        .label-title,
+        .label-value {
+          display: table-cell;
+          vertical-align: top;
+        }
+        .row {
+          display: flex;
+        }
+        .title {
+          color: var(--deemphasized-text-color);
+          margin-right: var(--spacing-m);
+        }
+        div.section {
+          margin: 0 var(--spacing-xl) var(--spacing-m) var(--spacing-xl);
+          display: flex;
+          align-items: center;
+        }
+        div.sectionIcon {
+          flex: 0 0 30px;
+        }
+        div.sectionIcon iron-icon {
+          position: relative;
+          width: 20px;
+          height: 20px;
+        }
+        .condition {
+          background-color: var(--gray-background);
+          padding: var(--spacing-m);
+          flex-grow: 1;
+        }
+        .expression {
+          color: var(--gray-foreground);
+        }
+        iron-icon.check {
+          color: var(--success-foreground);
+        }
+        iron-icon.close {
+          color: var(--warning-foreground);
+        }
+        .showConditions iron-icon {
+          color: inherit;
+        }
+        div.showConditions {
+          border-top: 1px solid var(--border-color);
+          margin-top: var(--spacing-m);
+          padding: var(--spacing-m) var(--spacing-xl) 0;
+        }
+      `,
+    ];
+  }
 
-  computeLabels(
-    change?: ParsedChangeInfo,
-    requirement?: SubmitRequirementResultInfo
-  ) {
-    if (!requirement) return [];
-    const requirementLabels = extractAssociatedLabels(requirement);
-    const labels = change?.labels ?? {};
+  override render() {
+    if (!this.requirement) return;
+    const icon = iconForStatus(this.requirement.status);
+    return html` <div id="container" role="tooltip" tabindex="-1">
+      <div class="section">
+        <div class="sectionIcon">
+          <iron-icon class="${icon}" icon="gr-icons:${icon}"></iron-icon>
+        </div>
+        <div class="sectionContent">
+          <h3 class="name heading-3">
+            <span>${this.requirement.name}</span>
+          </h3>
+        </div>
+      </div>
+      <div class="section">
+        <div class="sectionIcon">
+          <iron-icon class="small" icon="gr-icons:info-outline"></iron-icon>
+        </div>
+        <div class="sectionContent">
+          <div class="row">
+            <div class="title">Status</div>
+            <div>${this.requirement.status}</div>
+          </div>
+        </div>
+      </div>
+      ${this.renderLabelSection()} ${this.renderConditionSection()}
+    </div>`;
+  }
+
+  private renderLabelSection() {
+    const labels = this.computeLabels();
+    return html` <div class="section">
+      ${labels.map(l => this.renderLabel(l))}
+    </div>`;
+  }
+
+  private renderLabel(label: Label) {
+    return html`
+      <section class="label">
+        <div class="label-title">
+          <gr-limited-text
+            class="name"
+            limit="25"
+            text="${label.labelName}"
+          ></gr-limited-text>
+        </div>
+        <div class="label-value">
+          <gr-label-info
+            .change=${this.change}
+            .account=${this.account}
+            .mutable=${this.mutable}
+            .label="${label.labelName}"
+            .labelInfo="${label.labelInfo}"
+          ></gr-label-info>
+        </div>
+      </section>
+    `;
+  }
+
+  private renderConditionSection() {
+    if (!this.expanded) {
+      return html` <div class="showConditions">
+        <gr-button
+          link=""
+          class="showConditions"
+          @click="${(_: MouseEvent) => this.handleShowConditions()}"
+        >
+          View condition
+          <iron-icon icon="gr-icons:expand-more"></iron-icon
+        ></gr-button>
+      </div>`;
+    } else {
+      return html`
+        <div class="section">
+          <div class="sectionIcon">
+            <iron-icon icon="gr-icons:description"></iron-icon>
+          </div>
+          <div class="sectionContent">${this.requirement?.description}</div>
+        </div>
+        ${this.renderCondition(
+          'Blocking condition',
+          this.requirement?.submittability_expression_result
+        )}
+        ${this.renderCondition(
+          'Application condition',
+          this.requirement?.applicability_expression_result
+        )}
+        ${this.renderCondition(
+          'Override condition',
+          this.requirement?.override_expression_result
+        )}
+      `;
+    }
+  }
+
+  private computeLabels() {
+    if (!this.requirement) return [];
+    const requirementLabels = extractAssociatedLabels(this.requirement);
+    const labels = this.change?.labels ?? {};
 
     const allLabels: Label[] = [];
 
@@ -84,17 +239,23 @@
     return allLabels;
   }
 
-  computeIcon(status: SubmitRequirementStatus) {
-    return iconForStatus(status);
-  }
-
-  renderCondition(expression?: SubmitRequirementExpressionInfo) {
+  private renderCondition(
+    name: string,
+    expression?: SubmitRequirementExpressionInfo
+  ) {
     if (!expression) return '';
-
-    return expression.expression;
+    return html`
+      <div class="section">
+        <div class="sectionIcon"></div>
+        <div class="sectionContent condition">
+          ${name}:<br />
+          <span class="expression"> ${expression.expression} </span>
+        </div>
+      </div>
+    `;
   }
 
-  _handleShowConditions() {
+  private handleShowConditions() {
     this.expanded = true;
   }
 }
diff --git a/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts b/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts
deleted file mode 100644
index 192a812..0000000
--- a/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts
+++ /dev/null
@@ -1,189 +0,0 @@
-/**
- * @license
- * Copyright (C) 2021 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-font-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="gr-hovercard-shared-style">
-    #container {
-      min-width: 356px;
-      max-width: 356px;
-      padding: var(--spacing-xl) 0 var(--spacing-m) 0;
-    }
-    section.label {
-      display: table-row;
-    }
-    .label-title {
-      min-width: 10em;
-      padding-top: var(--spacing-s);
-    }
-    .label-value {
-      padding-top: var(--spacing-s);
-    }
-    .label-title,
-    .label-value {
-      display: table-cell;
-      vertical-align: top;
-    }
-    .row {
-      display: flex;
-    }
-    .title {
-      color: var(--deemphasized-text-color);
-      margin-right: var(--spacing-m);
-    }
-    div.section {
-      margin: 0 var(--spacing-xl) var(--spacing-m) var(--spacing-xl);
-      display: flex;
-    }
-    div.sectionIcon {
-      flex: 0 0 30px;
-    }
-    div.sectionIcon iron-icon {
-      position: relative;
-      top: 2px;
-      width: 20px;
-      height: 20px;
-    }
-    .condition {
-      background-color: var(--gray-background);
-      padding: var(--spacing-m);
-      flex-grow: 1;
-    }
-    .expression {
-      color: var(--gray-foreground);
-    }
-    iron-icon.check {
-      color: var(--success-foreground);
-    }
-    iron-icon.close {
-      color: var(--warning-foreground);
-    }
-    .showConditions iron-icon {
-      color: inherit;
-    }
-    div.showConditions {
-      border-top: 1px solid var(--border-color);
-      margin-top: var(--spacing-m);
-      padding: var(--spacing-m) var(--spacing-xl) 0;
-    }
-  </style>
-  <div id="container" role="tooltip" tabindex="-1">
-    <div class="section">
-      <div class="sectionIcon">
-        <iron-icon
-          class$="[[computeIcon(requirement.status)]]"
-          icon="gr-icons:[[computeIcon(requirement.status)]]"
-        ></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <h3 class="name heading-3">
-          <span>[[requirement.name]]</span>
-        </h3>
-      </div>
-    </div>
-    <div class="section">
-      <div class="sectionIcon">
-        <iron-icon class="small" icon="gr-icons:info-outline"></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <div class="row">
-          <div class="title">Status</div>
-          <div>[[requirement.status]]</div>
-        </div>
-      </div>
-    </div>
-    <div class="section">
-      <template is="dom-repeat" items="[[_labels]]">
-        <section class="label">
-          <div class="label-title">
-            <gr-limited-text
-              class="name"
-              limit="25"
-              text="[[item.labelName]]"
-            ></gr-limited-text>
-          </div>
-          <div class="label-value">
-            <gr-label-info
-              change="{{change}}"
-              account="[[account]]"
-              mutable="[[mutable]]"
-              label="[[item.labelName]]"
-              label-info="[[item.labelInfo]]"
-            ></gr-label-info>
-          </div>
-        </section>
-      </template>
-    </div>
-    <template is="dom-if" if="[[!expanded]]">
-      <div class="showConditions">
-        <gr-button
-          link=""
-          class="showConditions"
-          on-click="_handleShowConditions"
-        >
-          View condition
-          <iron-icon icon="gr-icons:expand-more"></iron-icon
-        ></gr-button>
-      </div>
-    </template>
-    <template is="dom-if" if="[[expanded]]">
-      <div class="section">
-        <div class="sectionIcon">
-          <iron-icon icon="gr-icons:description"></iron-icon>
-        </div>
-        <div class="sectionContent">[[requirement.description]]</div>
-      </div>
-      <div class="section">
-        <div class="sectionIcon"></div>
-        <div class="sectionContent condition">
-          Blocking condition:<br />
-          <span class="expression">
-            [[renderCondition(requirement.submittability_expression_result)]]
-          </span>
-        </div>
-      </div>
-      <template
-        is="dom-if"
-        if="[[requirement.applicability_expression_result]]"
-      >
-        <div class="section">
-          <div class="sectionIcon"></div>
-          <div class="sectionContent condition">
-            Application condition:<br />
-            <span class="expression">
-              [[renderCondition(requirement.applicability_expression_result)]]
-            </span>
-          </div>
-        </div>
-      </template>
-      <template is="dom-if" if="[[requirement.override_expression_result]]">
-        <div class="section">
-          <div class="sectionIcon"></div>
-          <div class="sectionContent condition">
-            Override condition:<br />
-            <span class="expression">
-              [[renderCondition(requirement.override_expression_result)]]
-            </span>
-          </div>
-        </div>
-      </template>
-    </template>
-  </div>
-`;
diff --git a/polygerrit-ui/app/elements/change/gr-submit-requirements/gr-submit-requirements.ts b/polygerrit-ui/app/elements/change/gr-submit-requirements/gr-submit-requirements.ts
index fa590a3..004d594 100644
--- a/polygerrit-ui/app/elements/change/gr-submit-requirements/gr-submit-requirements.ts
+++ b/polygerrit-ui/app/elements/change/gr-submit-requirements/gr-submit-requirements.ts
@@ -16,11 +16,13 @@
  */
 import '../gr-submit-requirement-hovercard/gr-submit-requirement-hovercard';
 import {LitElement, css, html} from 'lit';
-import {customElement, property} from 'lit/decorators';
+import {customElement, property, state} from 'lit/decorators';
 import {ParsedChangeInfo} from '../../../types/types';
 import {
   AccountInfo,
   isDetailedLabelInfo,
+  isQuickLabelInfo,
+  LabelInfo,
   LabelNameToInfoMap,
   SubmitRequirementResultInfo,
   SubmitRequirementStatus,
@@ -28,11 +30,21 @@
 import {unique} from '../../../utils/common-util';
 import {
   extractAssociatedLabels,
+  getAllUniqueApprovals,
+  hasNeutralStatus,
   hasVotes,
   iconForStatus,
 } from '../../../utils/label-util';
 import {fontStyles} from '../../../styles/gr-font-styles';
-import {charsOnly} from '../../../utils/string-util';
+import {charsOnly, pluralize} from '../../../utils/string-util';
+import {subscribe} from '../../lit/subscription-controller';
+import {
+  allRunsLatestPatchsetLatestAttempt$,
+  CheckRun,
+} from '../../../services/checks/checks-model';
+import {getResultsOf, hasResultsOf} from '../../../services/checks/checks-util';
+import {Category} from '../../../api/checks';
+import '../../shared/gr-vote-chip/gr-vote-chip';
 
 @customElement('gr-submit-requirements')
 export class GrSubmitRequirements extends LitElement {
@@ -45,12 +57,14 @@
   @property({type: Boolean})
   mutable?: boolean;
 
+  @state()
+  runs: CheckRun[] = [];
+
   static override get styles() {
     return [
       fontStyles,
       css`
         .metadata-title {
-          font-weight: var(--font-weight-bold);
           color: var(--deemphasized-text-color);
           padding-left: var(--metadata-horizontal-padding);
           margin: 0 0 var(--spacing-s);
@@ -67,24 +81,20 @@
         iron-icon.close {
           color: var(--warning-foreground);
         }
-        .testing {
-          margin-top: var(--spacing-xxl);
-          padding-left: var(--metadata-horizontal-padding);
-          color: var(--deemphasized-text-color);
-        }
-        .testing gr-button {
-          min-width: 25px;
-        }
-        .testing * {
-          visibility: hidden;
-        }
-        .testing:hover * {
-          visibility: visible;
-        }
         .requirements,
-        section.votes {
+        section.trigger-votes {
           margin-left: var(--spacing-l);
         }
+        .trigger-votes {
+          padding-top: var(--spacing-s);
+          display: flex;
+          flex-wrap: wrap;
+          gap: var(--spacing-s);
+          /* Setting max-width as defined in Submit Requirements design,
+           *  to wrap overflowed items to next row.
+           */
+          max-width: 390px;
+        }
         gr-limited-text.name {
           font-weight: var(--font-weight-bold);
         }
@@ -95,20 +105,38 @@
         td {
           padding: var(--spacing-s);
         }
+        .votes-cell {
+          display: flex;
+        }
+        .check-error {
+          margin-right: var(--spacing-l);
+        }
+        .check-error iron-icon {
+          color: var(--error-foreground);
+          vertical-align: top;
+        }
+        gr-vote-chip {
+          margin-right: var(--spacing-s);
+        }
       `,
     ];
   }
 
+  constructor() {
+    super();
+    subscribe(this, allRunsLatestPatchsetLatestAttempt$, x => (this.runs = x));
+  }
+
   override render() {
     const submit_requirements = (this.change?.submit_requirements ?? []).filter(
       req => req.status !== SubmitRequirementStatus.NOT_APPLICABLE
     );
-    return html` <h2
+    return html` <h3
         class="metadata-title heading-3"
         id="submit-requirements-caption"
       >
         Submit Requirements
-      </h2>
+      </h3>
       <table class="requirements" aria-labelledby="submit-requirements-caption">
         <thead hidden>
           <tr>
@@ -130,7 +158,12 @@
                   .text="${requirement.name}"
                 ></gr-limited-text>
               </td>
-              <td>${this.renderVotes(requirement)}</td>
+              <td>
+                <div class="votes-cell">
+                  ${this.renderVotes(requirement)}
+                  ${this.renderChecks(requirement)}
+                </div>
+              </td>
             </tr>`
           )}
         </tbody>
@@ -142,13 +175,11 @@
             .requirement="${requirement}"
             .change="${this.change}"
             .account="${this.account}"
-            .mutable="${this.mutable}"
+            .mutable="${this.mutable ?? false}"
           ></gr-submit-requirement-hovercard>
         `
       )}
-      ${this.renderTriggerVotes(
-        submit_requirements
-      )}${this.renderFakeControls()}`;
+      ${this.renderTriggerVotes(submit_requirements)}`;
   }
 
   renderStatus(status: SubmitRequirementStatus) {
@@ -180,23 +211,47 @@
 
   renderLabelVote(label: string, labels: LabelNameToInfoMap) {
     const labelInfo = labels[label];
-    if (!isDetailedLabelInfo(labelInfo)) return;
-    const uniqueApprovals = (labelInfo.all ?? [])
+    if (isDetailedLabelInfo(labelInfo)) {
+      const uniqueApprovals = getAllUniqueApprovals(labelInfo).filter(
+        approval => !hasNeutralStatus(labelInfo, approval)
+      );
+      return uniqueApprovals.map(
+        approvalInfo =>
+          html`<gr-vote-chip
+            .vote="${approvalInfo}"
+            .label="${labelInfo}"
+            .more="${(labelInfo.all ?? []).filter(
+              other => other.value === approvalInfo.value
+            ).length > 1}"
+          ></gr-vote-chip>`
+      );
+    } else if (isQuickLabelInfo(labelInfo)) {
+      return [html`<gr-vote-chip .label="${labelInfo}"></gr-vote-chip>`];
+    } else {
+      return html``;
+    }
+  }
+
+  renderChecks(requirement: SubmitRequirementResultInfo) {
+    const requirementLabels = extractAssociatedLabels(requirement);
+    const requirementRuns = this.runs
+      .filter(run => hasResultsOf(run, Category.ERROR))
       .filter(
-        (approvalInfo, index, array) =>
-          index === array.findIndex(other => other.value === approvalInfo.value)
-      )
-      .sort((a, b) => -(a.value ?? 0) + (b.value ?? 0));
-    return uniqueApprovals.map(
-      approvalInfo =>
-        html`<gr-vote-chip
-          .vote="${approvalInfo}"
-          .label="${labelInfo}"
-          .more="${(labelInfo.all ?? []).filter(
-            other => other.value === approvalInfo.value
-          ).length > 1}"
-        ></gr-vote-chip>`
+        run => run.labelName && requirementLabels.includes(run.labelName)
+      );
+    const runsCount = requirementRuns.reduce(
+      (sum, run) => sum + getResultsOf(run, Category.ERROR).length,
+      0
     );
+    if (runsCount > 0) {
+      return html`<span class="check-error"
+        ><iron-icon icon="gr-icons:error"></iron-icon>${pluralize(
+          runsCount,
+          'error'
+        )}</span
+      >`;
+    }
+    return;
   }
 
   renderTriggerVotes(submitReqs: SubmitRequirementResultInfo[]) {
@@ -210,66 +265,88 @@
       .filter(label => hasVotes(labels[label]));
     if (!triggerVotes.length) return;
     return html`<h3 class="metadata-title heading-3">Trigger Votes</h3>
-      <section class="votes">
+      <section class="trigger-votes">
         ${triggerVotes.map(
-          label => html`${label}:
-            <gr-label-info
-              .change="${this.change}"
-              .account="${this.account}"
-              .mutable="${this.mutable}"
-              label="${label}"
+          label =>
+            html`<gr-trigger-vote
+              .label="${label}"
               .labelInfo="${labels[label]}"
-            ></gr-label-info>`
+            ></gr-trigger-vote>`
         )}
       </section>`;
   }
+}
 
-  renderFakeControls() {
+@customElement('gr-trigger-vote')
+export class GrTriggerVote extends LitElement {
+  @property()
+  label?: string;
+
+  @property({type: Object})
+  labelInfo?: LabelInfo;
+
+  static override get styles() {
+    return css`
+      :host {
+        display: block;
+      }
+      .container {
+        box-sizing: border-box;
+        border: 1px solid var(--border-color);
+        border-radius: calc(var(--border-radius) + 2px);
+        background-color: var(--background-color-primary);
+        display: flex;
+        padding: 0;
+        padding-left: var(--spacing-s);
+        padding-right: var(--spacing-xxs);
+        align-items: center;
+      }
+      .label {
+        padding-right: var(--spacing-s);
+        font-weight: var(--font-weight-bold);
+      }
+      gr-vote-chip {
+        --gr-vote-chip-width: 14px;
+        --gr-vote-chip-height: 14px;
+        margin-right: 0px;
+      }
+    `;
+  }
+
+  override render() {
+    if (!this.labelInfo) return;
     return html`
-      <div class="testing">
-        <div>Toggle fake data:</div>
-        <gr-button link @click="${() => this.renderFakeSubmitRequirements()}"
-          >G</gr-button
-        >
+      <div class="container">
+        <span class="label">${this.label}</span>
+        ${this.renderVotes()}
       </div>
     `;
   }
 
-  renderFakeSubmitRequirements() {
-    if (!this.change) return;
-    this.change = {
-      ...this.change,
-      submit_requirements: [
-        {
-          name: 'Code-Review',
-          status: SubmitRequirementStatus.SATISFIED,
-          description:
-            "At least one maximum vote for label 'Code-Review' is required",
-          submittability_expression_result: {
-            expression: 'label:Code-Review=MAX -label:Code-Review=MIN',
-            fulfilled: true,
-            passing_atoms: [],
-            failing_atoms: [],
-          },
-        },
-        {
-          name: 'Verified',
-          status: SubmitRequirementStatus.UNSATISFIED,
-          description: 'CI build and tests results are verified',
-          submittability_expression_result: {
-            expression: 'label:Verified=MAX -label:Verified=MIN',
-            fulfilled: false,
-            passing_atoms: [],
-            failing_atoms: [],
-          },
-        },
-      ],
-    };
+  private renderVotes() {
+    const {labelInfo} = this;
+    if (!labelInfo) return;
+    if (isDetailedLabelInfo(labelInfo)) {
+      const approvals = getAllUniqueApprovals(labelInfo).filter(
+        approval => !hasNeutralStatus(labelInfo, approval)
+      );
+      return approvals.map(
+        approvalInfo => html`<gr-vote-chip
+          .vote="${approvalInfo}"
+          .label="${labelInfo}"
+        ></gr-vote-chip>`
+      );
+    } else if (isQuickLabelInfo(labelInfo)) {
+      return [html`<gr-vote-chip .label="${this.labelInfo}"></gr-vote-chip>`];
+    } else {
+      return html``;
+    }
   }
 }
 
 declare global {
   interface HTMLElementTagNameMap {
     'gr-submit-requirements': GrSubmitRequirements;
+    'gr-trigger-vote': GrTriggerVote;
   }
 }
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
index 6ed5a2c..3eb28c9 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
@@ -51,11 +51,8 @@
       margin-right: var(--spacing-s);
     }
     gr-dropdown-list {
-      --trigger-style: {
-        color: var(--primary-text-color);
-        text-transform: none;
-        font-family: var(--font-family);
-      }
+      --trigger-style-text-color: var(--primary-text-color);
+      --trigger-style-font-family: var(--font-family);
     }
     .filter-text, .sort-text, .author-text {
       margin-right: var(--spacing-s);
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-action.ts b/polygerrit-ui/app/elements/checks/gr-checks-action.ts
index 87cab46..859fd33 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-action.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-action.ts
@@ -22,11 +22,11 @@
 
 @customElement('gr-checks-action')
 export class GrChecksAction extends LitElement {
-  @property()
+  @property({type: Object})
   action!: Action;
 
-  @property()
-  eventTarget?: EventTarget;
+  @property({type: Object})
+  eventTarget: HTMLElement | null = null;
 
   private checksService = appContext.checksService;
 
@@ -43,7 +43,7 @@
           white-space: nowrap;
         }
         gr-button {
-          --padding: var(--spacing-s) var(--spacing-m);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
         }
         paper-tooltip {
           text-transform: none;
@@ -72,7 +72,7 @@
   private renderTooltip() {
     if (!this.action.tooltip) return;
     return html`
-      <paper-tooltip offset="5" fit-to-visible-bounds="true">
+      <paper-tooltip offset="5" fit-to-visible-bounds>
         ${this.action.tooltip}
       </paper-tooltip>
     `;
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-attempt.ts b/polygerrit-ui/app/elements/checks/gr-checks-attempt.ts
index b4d87ae..69152b2 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-attempt.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-attempt.ts
@@ -21,7 +21,7 @@
 
 @customElement('gr-checks-attempt')
 class GrChecksAttempt extends LitElement {
-  @property()
+  @property({attribute: false})
   run?: CheckRun;
 
   static override get styles() {
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-results.ts b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
index 90f7215..9c27cdb 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-results.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
@@ -20,7 +20,9 @@
 import {LitElement, css, html, PropertyValues, TemplateResult} from 'lit';
 import {customElement, property, query, state} from 'lit/decorators';
 import './gr-checks-action';
+import './gr-hovercard-run';
 import '@polymer/paper-tooltip/paper-tooltip';
+import '@polymer/iron-icon/iron-icon';
 import {
   Action,
   Category,
@@ -46,7 +48,6 @@
   iconForLink,
   isCategory,
   otherPrimaryLinks,
-  primaryRunAction,
   secondaryLinks,
   tooltipForLink,
 } from '../../services/checks/checks-util';
@@ -80,19 +81,19 @@
   @query('td.nameCol div.name')
   nameEl?: HTMLElement;
 
-  @property()
+  @property({attribute: false})
   result?: RunResult;
 
-  @property()
+  @state()
   isExpanded = false;
 
   @property({type: Boolean, reflect: true})
   isExpandable = false;
 
-  @property()
+  @state()
   shouldRender = false;
 
-  @property()
+  @state()
   labels?: LabelNameToInfoMap;
 
   private checksService = appContext.checksService;
@@ -279,11 +280,10 @@
     ];
   }
 
-  override update(changedProperties: PropertyValues) {
+  override updated(changedProperties: PropertyValues) {
     if (changedProperties.has('result')) {
       this.isExpandable = !!this.result?.summary && !!this.result?.message;
     }
-    super.update(changedProperties);
   }
 
   override focus() {
@@ -293,7 +293,13 @@
   override firstUpdated() {
     const loading = this.shadowRoot?.querySelector('.container');
     assertIsDefined(loading, '"Loading" element');
-    whenVisible(loading, () => this.setAttribute('shouldRender', 'true'), 200);
+    whenVisible(
+      loading,
+      () => {
+        this.shouldRender = true;
+      },
+      200
+    );
   }
 
   override render() {
@@ -324,7 +330,6 @@
               ${this.result.checkName}
             </div>
             <div class="space"></div>
-            ${this.renderPrimaryRunAction()}
           </div>
         </td>
         <td class="summaryCol">
@@ -347,7 +352,7 @@
             role="switch"
             tabindex="0"
             ?hidden="${!this.isExpandable}"
-            ?aria-checked="${this.isExpanded}"
+            aria-checked="${this.isExpanded ? 'true' : 'false'}"
             aria-label="${this.isExpanded
               ? 'Collapse result row'
               : 'Expand result row'}"
@@ -367,13 +372,6 @@
     `;
   }
 
-  private renderPrimaryRunAction() {
-    if (!this.result) return;
-    const action = primaryRunAction(this.result);
-    if (!action) return;
-    return html`<gr-checks-action .action="${action}"></gr-checks-action>`;
-  }
-
   private renderExpanded() {
     if (!this.isExpanded) return;
     return html`<gr-result-expanded
@@ -428,7 +426,7 @@
     return html`
       <div class="label ${status}">
         <span>${label} ${valueStr}</span>
-        <paper-tooltip offset="5" fit-to-visible-bounds="true">
+        <paper-tooltip offset="5" ?fitToVisibleBounds="${true}">
           The check result has (probably) influenced this label vote.
         </paper-tooltip>
       </div>
@@ -525,7 +523,7 @@
   renderTag(tag: Tag) {
     return html`<div class="tag ${tag.color}">
       <span>${tag.name}</span>
-      <paper-tooltip offset="5" fit-to-visible-bounds="true">
+      <paper-tooltip offset="5" ?fitToVisibleBounds="${true}">
         ${tag.tooltip ?? 'A category tag for this check result'}
       </paper-tooltip>
     </div>`;
@@ -534,10 +532,10 @@
 
 @customElement('gr-result-expanded')
 class GrResultExpanded extends LitElement {
-  @property()
+  @property({attribute: false})
   result?: RunResult;
 
-  @property()
+  @state()
   repoConfig?: ConfigInfo;
 
   private changeService = appContext.changeService;
@@ -681,36 +679,36 @@
   filterRegExp = new RegExp('');
 
   /** All runs. Shown should only the selected/filtered ones. */
-  @property()
+  @property({attribute: false})
   runs: CheckRun[] = [];
 
   /**
    * Check names of runs that are selected in the runs panel. When this array
    * is empty, then no run is selected and all runs should be shown.
    */
-  @property()
+  @property({attribute: false})
   selectedRuns: string[] = [];
 
-  @property()
+  @state()
   actions: Action[] = [];
 
-  @property()
+  @state()
   links: Link[] = [];
 
-  @property()
+  @property({attribute: false})
   tabState?: ChecksTabState;
 
-  @property()
+  @state()
   someProvidersAreLoading = false;
 
-  @property()
+  @state()
   checksPatchsetNumber: PatchSetNumber | undefined = undefined;
 
-  @property()
+  @state()
   latestPatchsetNumber: PatchSetNumber | undefined = undefined;
 
   /** Maps checkName to selected attempt number. `undefined` means `latest`. */
-  @property()
+  @property({attribute: false})
   selectedAttempts: Map<string, number | undefined> = new Map<
     string,
     number | undefined
@@ -817,6 +815,7 @@
         }
         .headerTopRow .right .goToLatest gr-button {
           margin-right: var(--spacing-m);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
         }
         .headerBottomRow iron-icon {
           color: var(--link-color);
@@ -976,22 +975,12 @@
   }
 
   override render() {
-    // To pass CSS mixins for @apply to Polymer components, they need to appear
-    // in <style> inside the template.
-    const style = html`<style>
-      .headerTopRow .right .goToLatest gr-button {
-        --gr-button: {
-          padding: var(--spacing-s) var(--spacing-m);
-          text-transform: none;
-        }
-      }
-    </style>`;
-    const headerClasses = classMap({
+    const headerClasses = {
       header: true,
       notLatest: !!this.checksPatchsetNumber,
-    });
-    return html`${style}
-      <div class="${headerClasses}">
+    };
+    return html`
+      <div class="${classMap(headerClasses)}">
         <div class="headerTopRow">
           <div class="left">
             <h2 class="heading-2">Results</h2>
@@ -1007,7 +996,9 @@
               >
             </div>
             <gr-dropdown-list
-              value="${this.checksPatchsetNumber ?? this.latestPatchsetNumber}"
+              value="${this.checksPatchsetNumber ??
+              this.latestPatchsetNumber ??
+              0}"
               .items="${this.createPatchsetDropdownItems()}"
               @value-change="${this.onPatchsetSelected}"
             ></gr-dropdown-list>
@@ -1023,7 +1014,8 @@
         ${this.renderSection(Category.WARNING)}
         ${this.renderSection(Category.INFO)}
         ${this.renderSection(Category.SUCCESS)}
-      </div>`;
+      </div>
+    `;
   }
 
   private renderLinksAndActions() {
@@ -1295,9 +1287,9 @@
           ${repeat(
             filtered,
             result => result.internalResultId,
-            result => html`
+            (result?: RunResult) => html`
               <gr-result-row
-                class="${charsOnly(result.checkName)}"
+                class="${charsOnly(result!.checkName)}"
                 .result="${result}"
               ></gr-result-row>
             `
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
index 28354d2..a643c18 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import '@polymer/iron-icon/iron-icon';
 import {classMap} from 'lit/directives/class-map';
 import './gr-hovercard-run';
 import {css, html, LitElement, nothing, PropertyValues} from 'lit';
@@ -182,28 +183,24 @@
   @query('.chip')
   chipElement?: HTMLElement;
 
-  @property()
+  @property({attribute: false})
   run!: CheckRun;
 
-  @property()
+  @property({attribute: false})
   selected = false;
 
-  @property()
+  @property({attribute: false})
   selectedAttempt?: number;
 
-  @property()
+  @property({attribute: false})
   deselected = false;
 
-  @property()
+  @state()
   shouldRender = false;
 
   override firstUpdated() {
     assertIsDefined(this.chipElement, 'chip element');
-    whenVisible(
-      this.chipElement,
-      () => this.setAttribute('shouldRender', 'true'),
-      200
-    );
+    whenVisible(this.chipElement, () => (this.shouldRender = true), 200);
   }
 
   protected override updated(changedProperties: PropertyValues) {
@@ -303,9 +300,6 @@
   renderStatusLink() {
     const link = this.run.statusLink;
     if (!link) return;
-    // For COMPLETED we think that the status link are too much clutter.
-    // That could be re-considered.
-    if (this.run.status !== RunStatus.RUNNING) return;
     return html`
       <a href="${link}" target="_blank" @click="${this.onLinkClick}"
         ><iron-icon
@@ -368,29 +362,29 @@
   @state()
   filterRegExp = new RegExp('');
 
-  @property()
+  @property({attribute: false})
   runs: CheckRun[] = [];
 
   @property({type: Boolean, reflect: true})
   collapsed = false;
 
-  @property()
+  @property({attribute: false})
   selectedRuns: string[] = [];
 
   /** Maps checkName to selected attempt number. `undefined` means `latest`. */
-  @property()
+  @property({attribute: false})
   selectedAttempts: Map<string, number | undefined> = new Map<
     string,
     number | undefined
   >();
 
-  @property()
+  @property({attribute: false})
   tabState?: ChecksTabState;
 
-  @property()
+  @state()
   errorMessages: ErrorMessages = {};
 
-  @property()
+  @state()
   loginCallback?: () => void;
 
   private isSectionExpanded = new Map<RunStatus, boolean>();
@@ -429,11 +423,11 @@
           flex-grow: 1;
         }
         .title gr-button {
-          --padding: var(--spacing-s) var(--spacing-m);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
           white-space: nowrap;
         }
         .title gr-button.expandButton {
-          --padding: var(--spacing-xs) var(--spacing-s);
+          --gr-button-padding: var(--spacing-xs) var(--spacing-s);
         }
         :host(:not([collapsed])) .expandButton {
           margin-right: calc(0px - var(--spacing-m));
@@ -475,6 +469,11 @@
         .testing:hover * {
           visibility: visible;
         }
+        .zero {
+          padding: var(--spacing-m) 0;
+          color: var(--primary-text-color);
+          margin-top: var(--spacing-m);
+        }
         .login,
         .error {
           padding: var(--spacing-m);
@@ -534,7 +533,7 @@
         <div class="flex-space"></div>
         ${this.renderTitleButtons()} ${this.renderCollapseButton()}
       </h2>
-      ${this.renderErrors()} ${this.renderSignIn()}
+      ${this.renderErrors()} ${this.renderSignIn()} ${this.renderZeroState()}
       <input
         id="filterInput"
         type="text"
@@ -548,6 +547,11 @@
     `;
   }
 
+  private renderZeroState() {
+    if (this.runs.length > 0) return;
+    return html`<div class="zero">No Check Run to show</div>`;
+  }
+
   private renderErrors() {
     return Object.entries(this.errorMessages).map(
       ([plugin, message]) =>
@@ -604,42 +608,48 @@
         @click="${() => fireRunSelectionReset(this)}"
         >Unselect All</gr-button
       >
-      <gr-button
-        class="font-normal"
-        link
+      <gr-tooltip-content
         title="${runButtonDisabled
           ? 'Disabled. Unselect checks without a "Run" action to enable the button.'
           : ''}"
-        has-tooltip="${runButtonDisabled}"
-        ?disabled="${runButtonDisabled}"
-        @click="${() => {
-          actions.forEach(action => this.checksService.triggerAction(action));
-        }}"
-        >Run Selected</gr-button
+        ?has-tooltip=${runButtonDisabled}
       >
+        <gr-button
+          class="font-normal"
+          link
+          ?disabled=${runButtonDisabled}
+          @click="${() => {
+            actions.forEach(action => this.checksService.triggerAction(action));
+          }}"
+          >Run Selected</gr-button
+        >
+      </gr-tooltip-content>
     `;
   }
 
   private renderCollapseButton() {
     return html`
-      <gr-button
-        link
-        class="expandButton"
-        role="switch"
-        ?aria-checked="${this.collapsed}"
-        aria-label="${this.collapsed
-          ? 'Expand runs panel'
-          : 'Collapse runs panel'}"
-        has-tooltip="true"
+      <gr-tooltip-content
+        has-tooltip
         title="${this.collapsed ? 'Expand runs panel' : 'Collapse runs panel'}"
-        @click="${() => (this.collapsed = !this.collapsed)}"
-        ><iron-icon
-          class="expandIcon"
-          icon="${this.collapsed
-            ? 'gr-icons:chevron-right'
-            : 'gr-icons:chevron-left'}"
-        ></iron-icon>
-      </gr-button>
+      >
+        <gr-button
+          link
+          class="expandButton"
+          role="switch"
+          aria-checked="${this.collapsed ? 'true' : 'false'}"
+          aria-label="${this.collapsed
+            ? 'Expand runs panel'
+            : 'Collapse runs panel'}"
+          @click="${() => (this.collapsed = !this.collapsed)}"
+          ><iron-icon
+            class="expandIcon"
+            icon="${this.collapsed
+              ? 'gr-icons:chevron-right'
+              : 'gr-icons:chevron-left'}"
+          ></iron-icon>
+        </gr-button>
+      </gr-tooltip-content>
     `;
   }
 
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-tab.ts b/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
index 688667a..ed6117a 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
@@ -40,22 +40,22 @@
  */
 @customElement('gr-checks-tab')
 export class GrChecksTab extends LitElement {
-  @property()
+  @state()
   runs: CheckRun[] = [];
 
-  @property()
+  @state()
   results: CheckResult[] = [];
 
-  @property()
+  @property({type: Object})
   tabState?: ChecksTabState;
 
-  @property()
+  @state()
   checksPatchsetNumber: PatchSetNumber | undefined = undefined;
 
-  @property()
+  @state()
   latestPatchsetNumber: PatchSetNumber | undefined = undefined;
 
-  @property()
+  @state()
   changeNum: NumericChangeId | undefined = undefined;
 
   @state()
diff --git a/polygerrit-ui/app/elements/checks/gr-hovercard-run.ts b/polygerrit-ui/app/elements/checks/gr-hovercard-run.ts
index d26856c..95b7157 100644
--- a/polygerrit-ui/app/elements/checks/gr-hovercard-run.ts
+++ b/polygerrit-ui/app/elements/checks/gr-hovercard-run.ts
@@ -14,12 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import './gr-checks-styles';
-import '../../styles/gr-font-styles';
-import {HovercardBehaviorMixin} from '../shared/gr-hovercard/gr-hovercard-behavior';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-hovercard-run_html';
-import {customElement, property} from '@polymer/decorators';
+import {fontStyles} from '../../styles/gr-font-styles';
+import {customElement, property} from 'lit/decorators';
 import './gr-checks-action';
 import {CheckRun} from '../../services/checks/checks-model';
 import {
@@ -31,102 +27,346 @@
 import {durationString, fromNow} from '../../utils/date-util';
 import {RunStatus} from '../../api/checks';
 import {ordinal} from '../../utils/string-util';
+import {HovercardMixin} from '../../mixins/hovercard-mixin/hovercard-mixin';
+import {css, html, LitElement} from 'lit';
+import {checksStyles} from './gr-checks-styles';
 
 // This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = HovercardBehaviorMixin(PolymerElement);
+const base = HovercardMixin(LitElement);
 
 @customElement('gr-hovercard-run')
 export class GrHovercardRun extends base {
-  static get template() {
-    return htmlTemplate;
-  }
-
   @property({type: Object})
   run?: CheckRun;
 
-  computeIcon(run?: CheckRun) {
-    if (!run) return '';
-    const category = worstCategory(run);
+  static override get styles() {
+    return [
+      fontStyles,
+      checksStyles,
+      base.styles || [],
+      css`
+        #container {
+          min-width: 356px;
+          max-width: 356px;
+          padding: var(--spacing-xl) 0 var(--spacing-m) 0;
+        }
+        .row {
+          display: flex;
+          margin-top: var(--spacing-s);
+        }
+        .attempts.row {
+          flex-wrap: wrap;
+        }
+        .chipRow {
+          display: flex;
+          margin-top: var(--spacing-s);
+        }
+        .chip {
+          background: var(--gray-background);
+          color: var(--gray-foreground);
+          border-radius: 20px;
+          padding: var(--spacing-xs) var(--spacing-m) var(--spacing-xs)
+            var(--spacing-s);
+        }
+        .title {
+          color: var(--deemphasized-text-color);
+          margin-right: var(--spacing-m);
+        }
+        div.section {
+          margin: 0 var(--spacing-xl) var(--spacing-m) var(--spacing-xl);
+          display: flex;
+        }
+        div.sectionIcon {
+          flex: 0 0 30px;
+        }
+        div.chip iron-icon {
+          width: 16px;
+          height: 16px;
+          /* Positioning of a 16px icon in the middle of a 20px line. */
+          position: relative;
+          top: 2px;
+        }
+        div.sectionIcon iron-icon {
+          position: relative;
+          top: 2px;
+          width: 20px;
+          height: 20px;
+        }
+        div.sectionIcon iron-icon.small {
+          position: relative;
+          top: 6px;
+          width: 16px;
+          height: 16px;
+        }
+        div.sectionContent iron-icon.link {
+          color: var(--link-color);
+        }
+        div.sectionContent .attemptIcon iron-icon,
+        div.sectionContent iron-icon.small {
+          width: 16px;
+          height: 16px;
+          margin-right: var(--spacing-s);
+          /* Positioning of a 16px icon in the middle of a 20px line. */
+          position: relative;
+          top: 2px;
+        }
+        div.sectionContent .attemptIcon iron-icon {
+          margin-right: 0;
+        }
+        .attemptIcon,
+        .attemptNumber {
+          margin-right: var(--spacing-s);
+          color: var(--deemphasized-text-color);
+          text-align: center;
+          width: 24px;
+          font-size: var(--font-size-small);
+        }
+        div.action {
+          border-top: 1px solid var(--border-color);
+          margin-top: var(--spacing-m);
+          padding: var(--spacing-m) var(--spacing-xl) 0;
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    if (!this.run) return '';
+    const icon = this.computeIcon();
+    return html`
+      <div id="container" role="tooltip" tabindex="-1">
+        <div class="section">
+          <div
+            ?hidden="${!this.run || this.run.status === RunStatus.RUNNABLE}"
+            class="chipRow"
+          >
+            <div class="chip">
+              <iron-icon icon="gr-icons:${this.computeChipIcon()}"></iron-icon>
+              <span>${this.run.status}</span>
+            </div>
+          </div>
+        </div>
+        <div class="section">
+          <div class="sectionIcon" ?hidden="${icon.length === 0}">
+            <iron-icon class="${icon}" icon="gr-icons:${icon}"></iron-icon>
+          </div>
+          <div class="sectionContent">
+            <h3 class="name heading-3">
+              <span>${this.run.checkName}</span>
+            </h3>
+          </div>
+        </div>
+        ${this.renderStatusSection()} ${this.renderAttemptSection()}
+        ${this.renderTimestampSection()} ${this.renderDescriptionSection()}
+        ${this.renderActions()}
+      </div>
+    `;
+  }
+
+  private renderStatusSection() {
+    if (!this.run || (!this.run.statusLink && !this.run.statusDescription))
+      return;
+
+    return html`
+      <div class="section">
+        <div class="sectionIcon">
+          <iron-icon class="small" icon="gr-icons:info-outline"></iron-icon>
+        </div>
+        <div class="sectionContent">
+          ${this.run.statusLink
+            ? html` <div class="row">
+                <div class="title">Status</div>
+                <div>
+                  <a href="${this.run.statusLink}" target="_blank"
+                    ><iron-icon
+                      aria-label="external link to check status"
+                      class="small link"
+                      icon="gr-icons:launch"
+                    ></iron-icon
+                    >${this.computeHostName(this.run.statusLink)}
+                  </a>
+                </div>
+              </div>`
+            : ''}
+          ${this.run.statusDescription
+            ? html` <div class="row">
+                <div class="title">Message</div>
+                <div>${this.run.statusDescription}</div>
+              </div>`
+            : ''}
+        </div>
+      </div>
+    `;
+  }
+
+  private renderAttemptSection() {
+    if (this.hideAttempts()) return;
+    const attempts = this.computeAttempts();
+    return html`
+      <div class="section">
+        <div class="sectionIcon">
+          <iron-icon class="small" icon="gr-icons:arrow-forward"></iron-icon>
+        </div>
+        <div class="sectionContent">
+          <div class="attempts row">
+            <div class="title">Attempt</div>
+            ${attempts.map(a => this.renderAttempt(a))}
+          </div>
+        </div>
+      </div>
+    `;
+  }
+
+  private renderAttempt(attempt: AttemptDetail) {
+    return html`
+      <div>
+        <div class="attemptIcon">
+          <iron-icon
+            class="${attempt.icon}"
+            icon="gr-icons:${attempt.icon}"
+          ></iron-icon>
+        </div>
+        <div class="attemptNumber">${ordinal(attempt.attempt)}</div>
+      </div>
+    `;
+  }
+
+  private renderTimestampSection() {
+    if (
+      !this.run ||
+      (!this.run.startedTimestamp &&
+        !this.run.scheduledTimestamp &&
+        !this.run.finishedTimestamp)
+    )
+      return;
+
+    return html`
+      <div class="section">
+        <div class="sectionIcon">
+          <iron-icon class="small" icon="gr-icons:schedule"></iron-icon>
+        </div>
+        <div class="sectionContent">
+          <div ?hidden="${this.hideScheduled()}" class="row">
+            <div class="title">Scheduled</div>
+            <div>${this.computeDuration(this.run.scheduledTimestamp)}</div>
+          </div>
+          <div ?hidden="${!this.run.startedTimestamp}" class="row">
+            <div class="title">Started</div>
+            <div>${this.computeDuration(this.run.startedTimestamp)}</div>
+          </div>
+          <div ?hidden="${!this.run.finishedTimestamp}" class="row">
+            <div class="title">Ended</div>
+            <div>${this.computeDuration(this.run.finishedTimestamp)}</div>
+          </div>
+          <div ?hidden="${this.hideCompletion()}" class="row">
+            <div class="title">Completion</div>
+            <div>${this.computeCompletionDuration()}</div>
+          </div>
+        </div>
+      </div>
+    `;
+  }
+
+  private renderDescriptionSection() {
+    if (!this.run || (!this.run.checkLink && !this.run.checkDescription))
+      return;
+    return html`
+      <div class="section">
+        <div class="sectionIcon">
+          <iron-icon class="small" icon="gr-icons:link"></iron-icon>
+        </div>
+        <div class="sectionContent">
+          ${this.run.checkDescription
+            ? html` <div class="row">
+                <div class="title">Description</div>
+                <div>${this.run.checkDescription}</div>
+              </div>`
+            : ''}
+          ${this.run.checkLink
+            ? html` <div class="row">
+                <div class="title">Documentation</div>
+                <div>
+                  <a href="${this.run.checkLink}" target="_blank"
+                    ><iron-icon
+                      aria-label="external link to check documentation"
+                      class="small link"
+                      icon="gr-icons:launch"
+                    ></iron-icon
+                    >${this.computeHostName(this.run.checkLink)}
+                  </a>
+                </div>
+              </div>`
+            : ''}
+        </div>
+      </div>
+    `;
+  }
+
+  private renderActions() {
+    const actions = runActions(this.run);
+    return actions.map(
+      action =>
+        html`
+          <div class="action">
+            <gr-checks-action
+              .eventTarget="${this._target}"
+              .action="${action}"
+            ></gr-checks-action>
+          </div>
+        `
+    );
+  }
+
+  computeIcon() {
+    if (!this.run) return '';
+    const category = worstCategory(this.run);
     if (category) return iconFor(category);
-    return run.status === RunStatus.COMPLETED
+    return this.run.status === RunStatus.COMPLETED
       ? iconFor(RunStatus.COMPLETED)
       : '';
   }
 
-  computeActions(run?: CheckRun) {
-    return runActions(run);
-  }
-
-  computeAttempt(attempt?: number) {
-    return ordinal(attempt);
-  }
-
-  computeAttempts(run?: CheckRun): AttemptDetail[] {
-    const details = run?.attemptDetails ?? [];
+  computeAttempts(): AttemptDetail[] {
+    const details = this.run?.attemptDetails ?? [];
     const more =
       details.length > 7 ? [{icon: 'more-horiz', attempt: undefined}] : [];
     return [...more, ...details.slice(-7)];
   }
 
-  computeChipIcon(run?: CheckRun) {
-    if (run?.status === RunStatus.COMPLETED) return 'check';
-    if (run?.status === RunStatus.RUNNING) return 'timelapse';
+  private computeChipIcon() {
+    if (this.run?.status === RunStatus.COMPLETED) return 'check';
+    if (this.run?.status === RunStatus.RUNNING) return 'timelapse';
     return '';
   }
 
-  computeCompletionDuration(run?: CheckRun) {
-    if (!run?.finishedTimestamp || !run?.startedTimestamp) return '';
-    return durationString(run.startedTimestamp, run.finishedTimestamp, true);
-  }
-
-  computeDuration(date?: Date) {
-    return date ? fromNow(date) : '';
-  }
-
-  computeHostName(link?: string) {
-    return link ? new URL(link).hostname : '';
-  }
-
-  hideChip(run?: CheckRun) {
-    return !run || run.status === RunStatus.RUNNABLE;
-  }
-
-  hideHeaderSectionIcon(run?: CheckRun) {
-    return this.computeIcon(run).length === 0;
-  }
-
-  hideStatusSection(run?: CheckRun) {
-    if (!run) return true;
-    return !run.statusLink && !run.statusDescription;
-  }
-
-  hideTimestampSection(run?: CheckRun) {
-    if (!run) return true;
-    return (
-      !run.startedTimestamp && !run.scheduledTimestamp && !run.finishedTimestamp
+  private computeCompletionDuration() {
+    if (!this.run?.finishedTimestamp || !this.run?.startedTimestamp) return '';
+    return durationString(
+      this.run.startedTimestamp,
+      this.run.finishedTimestamp,
+      true
     );
   }
 
-  hideAttempts(run?: CheckRun) {
-    const attemptCount = run?.attemptDetails?.length;
+  private computeDuration(date?: Date) {
+    return date ? fromNow(date) : '';
+  }
+
+  private computeHostName(link?: string) {
+    return link ? new URL(link).hostname : '';
+  }
+
+  private hideAttempts() {
+    const attemptCount = this.run?.attemptDetails?.length;
     return attemptCount === undefined || attemptCount < 2;
   }
 
-  hideScheduled(run?: CheckRun) {
-    return !run?.scheduledTimestamp || !!run?.startedTimestamp;
+  private hideScheduled() {
+    return !this.run?.scheduledTimestamp || !!this.run?.startedTimestamp;
   }
 
-  hideCompletion(run?: CheckRun) {
-    return !run?.startedTimestamp || !run?.finishedTimestamp;
-  }
-
-  hideDescriptionSection(run?: CheckRun) {
-    if (!run) return true;
-    return !run.checkLink && !run.checkDescription;
-  }
-
-  _convertUndefined(value?: string) {
-    return value ?? '';
+  private hideCompletion() {
+    return !this.run?.startedTimestamp || !this.run?.finishedTimestamp;
   }
 }
 
diff --git a/polygerrit-ui/app/elements/checks/gr-hovercard-run_html.ts b/polygerrit-ui/app/elements/checks/gr-hovercard-run_html.ts
deleted file mode 100644
index 49a1416..0000000
--- a/polygerrit-ui/app/elements/checks/gr-hovercard-run_html.ts
+++ /dev/null
@@ -1,232 +0,0 @@
-/**
- * @license
- * Copyright (C) 2021 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-font-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="gr-checks-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="gr-hovercard-shared-style">
-    #container {
-      min-width: 356px;
-      max-width: 356px;
-      padding: var(--spacing-xl) 0 var(--spacing-m) 0;
-    }
-    .row {
-      display: flex;
-      margin-top: var(--spacing-s);
-    }
-    .attempts.row {
-      flex-wrap: wrap;
-    }
-    .chipRow {
-      display: flex;
-      margin-top: var(--spacing-s);
-    }
-    .chip {
-      background: var(--gray-background);
-      color: var(--gray-foreground);
-      border-radius: 20px;
-      padding: var(--spacing-xs) var(--spacing-m) var(--spacing-xs)
-        var(--spacing-s);
-    }
-    .title {
-      color: var(--deemphasized-text-color);
-      margin-right: var(--spacing-m);
-    }
-    div.section {
-      margin: 0 var(--spacing-xl) var(--spacing-m) var(--spacing-xl);
-      display: flex;
-    }
-    div.sectionIcon {
-      flex: 0 0 30px;
-    }
-    div.chip iron-icon {
-      width: 16px;
-      height: 16px;
-      /* Positioning of a 16px icon in the middle of a 20px line. */
-      position: relative;
-      top: 2px;
-    }
-    div.sectionIcon iron-icon {
-      position: relative;
-      top: 2px;
-      width: 20px;
-      height: 20px;
-    }
-    div.sectionIcon iron-icon.small {
-      position: relative;
-      top: 6px;
-      width: 16px;
-      height: 16px;
-    }
-    div.sectionContent iron-icon.link {
-      color: var(--link-color);
-    }
-    div.sectionContent .attemptIcon iron-icon,
-    div.sectionContent iron-icon.small {
-      width: 16px;
-      height: 16px;
-      margin-right: var(--spacing-s);
-      /* Positioning of a 16px icon in the middle of a 20px line. */
-      position: relative;
-      top: 2px;
-    }
-    div.sectionContent .attemptIcon iron-icon {
-      margin-right: 0;
-    }
-    .attemptIcon,
-    .attemptNumber {
-      margin-right: var(--spacing-s);
-      color: var(--deemphasized-text-color);
-      text-align: center;
-      width: 24px;
-      font-size: var(--font-size-small);
-    }
-    div.action {
-      border-top: 1px solid var(--border-color);
-      margin-top: var(--spacing-m);
-      padding: var(--spacing-m) var(--spacing-xl) 0;
-    }
-  </style>
-  <div id="container" role="tooltip" tabindex="-1">
-    <div class="section">
-      <div hidden$="[[hideChip(run)]]" class="chipRow">
-        <div class="chip">
-          <iron-icon icon="gr-icons:[[computeChipIcon(run)]]"></iron-icon>
-          <span>[[run.status]]</span>
-        </div>
-      </div>
-    </div>
-    <div class="section">
-      <div class="sectionIcon" hidden$="[[hideHeaderSectionIcon(run)]]">
-        <iron-icon
-          class$="[[computeIcon(run)]]"
-          icon="gr-icons:[[computeIcon(run)]]"
-        ></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <h3 class="name heading-3">
-          <span>[[run.checkName]]</span>
-        </h3>
-      </div>
-    </div>
-    <div class="section" hidden$="[[hideStatusSection(run)]]">
-      <div class="sectionIcon">
-        <iron-icon class="small" icon="gr-icons:info-outline"></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <div hidden$="[[!run.statusLink]]" class="row">
-          <div class="title">Status</div>
-          <div>
-            <a href="[[_convertUndefined(run.statusLink)]]" target="_blank"
-              ><iron-icon
-                aria-label="external link to check status"
-                class="small link"
-                icon="gr-icons:launch"
-              ></iron-icon
-              >[[computeHostName(run.statusLink)]]
-            </a>
-          </div>
-        </div>
-        <div hidden$="[[!run.statusDescription]]" class="row">
-          <div class="title">Message</div>
-          <div>[[run.statusDescription]]</div>
-        </div>
-      </div>
-    </div>
-    <div class="section" hidden$="[[hideAttempts(run)]]">
-      <div class="sectionIcon">
-        <iron-icon class="small" icon="gr-icons:arrow-forward"></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <div hidden$="[[hideAttempts(run)]]" class="attempts row">
-          <div class="title">Attempt</div>
-          <template is="dom-repeat" items="[[computeAttempts(run)]]">
-            <div>
-              <div class="attemptIcon">
-                <iron-icon
-                  class$="[[item.icon]]"
-                  icon="gr-icons:[[item.icon]]"
-                ></iron-icon>
-              </div>
-              <div class="attemptNumber">[[computeAttempt(item.attempt)]]</div>
-            </div>
-          </template>
-        </div>
-      </div>
-    </div>
-    <div class="section" hidden$="[[hideTimestampSection(run)]]">
-      <div class="sectionIcon">
-        <iron-icon class="small" icon="gr-icons:schedule"></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <div hidden$="[[hideScheduled(run)]]" class="row">
-          <div class="title">Scheduled</div>
-          <div>[[computeDuration(run.scheduledTimestamp)]]</div>
-        </div>
-        <div hidden$="[[!run.startedTimestamp]]" class="row">
-          <div class="title">Started</div>
-          <div>[[computeDuration(run.startedTimestamp)]]</div>
-        </div>
-        <div hidden$="[[!run.finishedTimestamp]]" class="row">
-          <div class="title">Ended</div>
-          <div>[[computeDuration(run.finishedTimestamp)]]</div>
-        </div>
-        <div hidden$="[[hideCompletion(run)]]" class="row">
-          <div class="title">Completion</div>
-          <div>[[computeCompletionDuration(run)]]</div>
-        </div>
-      </div>
-    </div>
-    <div class="section" hidden$="[[hideDescriptionSection(run)]]">
-      <div class="sectionIcon">
-        <iron-icon class="small" icon="gr-icons:link"></iron-icon>
-      </div>
-      <div class="sectionContent">
-        <div hidden$="[[!run.checkDescription]]" class="row">
-          <div class="title">Description</div>
-          <div>[[run.checkDescription]]</div>
-        </div>
-        <div hidden$="[[!run.checkLink]]" class="row">
-          <div class="title">Documentation</div>
-          <div>
-            <a href="[[_convertUndefined(run.checkLink)]]" target="_blank"
-              ><iron-icon
-                aria-label="external link to check documentation"
-                class="small link"
-                icon="gr-icons:launch"
-              ></iron-icon
-              >[[computeHostName(run.checkLink)]]
-            </a>
-          </div>
-        </div>
-      </div>
-    </div>
-    <template is="dom-repeat" items="[[computeActions(run)]]">
-      <div class="action">
-        <gr-checks-action
-          event-target="[[_target]]"
-          action="[[item]]"
-        ></gr-checks-action>
-      </div>
-    </template>
-  </div>
-`;
diff --git a/polygerrit-ui/app/elements/checks/gr-hovercard-run_test.ts b/polygerrit-ui/app/elements/checks/gr-hovercard-run_test.ts
index 67781f5..352219a 100644
--- a/polygerrit-ui/app/elements/checks/gr-hovercard-run_test.ts
+++ b/polygerrit-ui/app/elements/checks/gr-hovercard-run_test.ts
@@ -33,7 +33,7 @@
   });
 
   teardown(() => {
-    element.hide();
+    element.hide(new MouseEvent('click'));
   });
 
   test('hovercard is shown', () => {
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
index 0dbe823a..eb55177 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
@@ -76,12 +76,13 @@
     super.disconnectedCallback();
   }
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
         gr-dropdown {
           padding: 0 var(--spacing-m);
+          --gr-button-text-color: var(--header-text-color);
         }
         gr-avatar {
           height: 2em;
@@ -92,15 +93,13 @@
     ];
   }
 
-  render() {
+  override render() {
     // To pass CSS mixins for @apply to Polymer components, they need to appear
     // in <style> inside the template.
+    /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
         gr-dropdown {
-          --gr-button: {
-            color: var(--header-text-color);
-          }
           --gr-dropdown-item: {
             color: var(--primary-text-color);
           }
diff --git a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_test.ts b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_test.ts
index 2dec8d2..c51988e 100644
--- a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_test.ts
@@ -26,15 +26,16 @@
 suite('gr-error-dialog tests', () => {
   let element: GrErrorDialog;
 
-  setup(() => {
+  setup(async () => {
     element = basicFixture.instantiate();
+    await flush();
   });
 
   test('dismiss tap fires event', async () => {
     const dismissCalled = mockPromise();
     element.addEventListener('dismiss', () => dismissCalled.resolve());
     MockInteractions.tap(
-      (queryAndAssert(element, '#dialog') as GrDialog).$.confirm
+      (queryAndAssert(element, '#dialog') as GrDialog).confirmButton!
     );
     await dismissCalled;
   });
diff --git a/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.ts b/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.ts
index 0b191f1..541d877 100644
--- a/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.ts
+++ b/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.ts
@@ -27,6 +27,7 @@
   SectionView,
 } from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {property, customElement} from '@polymer/decorators';
+import {appContext} from '../../../services/app-context';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -60,13 +61,14 @@
   @property({type: Array})
   _right?: SectionShortcut[];
 
-  private keyboardShortcutDirectoryListener: ShortcutListener;
+  private readonly shortcutListener: ShortcutListener;
+
+  private readonly shortcuts = appContext.shortcutsService;
 
   constructor() {
     super();
-    this.keyboardShortcutDirectoryListener = (
-      d?: Map<ShortcutSection, SectionView>
-    ) => this._onDirectoryUpdated(d);
+    this.shortcutListener = (d?: Map<ShortcutSection, SectionView>) =>
+      this._onDirectoryUpdated(d);
   }
 
   override ready() {
@@ -76,15 +78,11 @@
 
   override connectedCallback() {
     super.connectedCallback();
-    this.addKeyboardShortcutDirectoryListener(
-      this.keyboardShortcutDirectoryListener
-    );
+    this.shortcuts.addListener(this.shortcutListener);
   }
 
   override disconnectedCallback() {
-    this.removeKeyboardShortcutDirectoryListener(
-      this.keyboardShortcutDirectoryListener
-    );
+    this.shortcuts.removeListener(this.shortcutListener);
     super.disconnectedCallback();
   }
 
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index 4a6f009..f0cff85 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -177,8 +177,8 @@
 
   CHANGE_ID_QUERY: /^\/id\/(I[0-9a-f]{40})$/,
 
-  // Matches /c/<changeNum>/[<basePatchNum>..][<patchNum>][/].
-  CHANGE_LEGACY: /^\/c\/(\d+)\/?(((-?\d+|edit)(\.\.(\d+|edit))?))?\/?$/,
+  // Matches /c/<changeNum>/[*][/].
+  CHANGE_LEGACY: /^\/c\/(\d+)\/?(.*)$/,
   CHANGE_NUMBER_LEGACY: /^\/(\d+)\/?/,
 
   // Matches
@@ -210,10 +210,6 @@
   // Matches /c/<project>/+/<changeNum>/[<patchNum|edit>]/<path>,edit[#lineNum]
   DIFF_EDIT: /^\/c\/(.+)\/\+\/(\d+)\/(\d+|edit)\/(.+),edit(#\d+)?$/,
 
-  // Matches non-project-relative
-  // /c/<changeNum>/[<basePatchNum>..]<patchNum>/<path>.
-  DIFF_LEGACY: /^\/c\/(\d+)\/((-?\d+|edit)(\.\.(\d+|edit))?)\/(.+)/,
-
   // Matches diff routes using @\d+ to specify a file name (whether or not
   // the project name is included).
   // eslint-disable-next-line max-len
@@ -287,15 +283,6 @@
 
 type QueryStringItem = [string, string]; // [key, value]
 
-type GenerateUrlLegacyChangeViewParameters = Omit<
-  GenerateUrlChangeViewParameters,
-  'project'
->;
-type GenerateUrlLegacyDiffViewParameters = Omit<
-  GenerateUrlDiffViewParameters,
-  'project'
->;
-
 interface PatchRangeParams {
   patchNum?: PatchSetNum;
   basePatchNum?: BasePatchSetNum;
@@ -679,37 +666,6 @@
   }
 
   /**
-   * Given a set of params without a project, gets the project from the rest
-   * API project lookup and then sets the app params.
-   */
-  _normalizeLegacyRouteParams(
-    params: Readonly<
-      | GenerateUrlLegacyChangeViewParameters
-      | GenerateUrlLegacyDiffViewParameters
-    >
-  ) {
-    if (!params.changeNum) {
-      return Promise.resolve();
-    }
-
-    return this.restApiService
-      .getFromProjectLookup(params.changeNum)
-      .then(project => {
-        // Show a 404 and terminate if the lookup request failed. Attempting
-        // to redirect after failing to get the project loops infinitely.
-        if (!project) {
-          this._show404();
-          return;
-        }
-        const updatedParams:
-          | GenerateUrlChangeViewParameters
-          | GenerateUrlDiffViewParameters = {...params, project};
-        this._normalizePatchRangeParams(updatedParams);
-        this._redirect(this._generateUrl(updatedParams));
-      });
-  }
-
-  /**
    * Normalizes the params object, and determines if the URL needs to be
    * modified to fit the proper schema.
    *
@@ -1100,8 +1056,6 @@
 
     this._mapRoute(RoutePattern.CHANGE_LEGACY, '_handleChangeLegacyRoute');
 
-    this._mapRoute(RoutePattern.DIFF_LEGACY, '_handleDiffLegacyRoute');
-
     this._mapRoute(RoutePattern.AGREEMENTS, '_handleAgreementsRoute', true);
 
     this._mapRoute(
@@ -1666,41 +1620,26 @@
   }
 
   _handleChangeLegacyRoute(ctx: PageContextWithQueryMap) {
-    // Parameter order is based on the regex group number matched.
-    const params: GenerateUrlLegacyChangeViewParameters = {
-      changeNum: Number(ctx.params[0]) as NumericChangeId,
-      basePatchNum: convertToPatchSetNum(ctx.params[3]) as BasePatchSetNum,
-      patchNum: convertToPatchSetNum(ctx.params[5]),
-      view: GerritView.CHANGE,
-      querystring: ctx.querystring,
-    };
-
-    this._normalizeLegacyRouteParams(params);
+    const changeNum = Number(ctx.params[0]) as NumericChangeId;
+    if (!changeNum) {
+      this._show404();
+      return;
+    }
+    this.restApiService.getFromProjectLookup(changeNum).then(project => {
+      // Show a 404 and terminate if the lookup request failed. Attempting
+      // to redirect after failing to get the project loops infinitely.
+      if (!project) {
+        this._show404();
+        return;
+      }
+      this._redirect(`/c/${project}/+/${changeNum}/${ctx.params[1]}`);
+    });
   }
 
   _handleLegacyLinenum(ctx: PageContextWithQueryMap) {
     this._redirect(ctx.path.replace(LEGACY_LINENUM_PATTERN, '#$1'));
   }
 
-  _handleDiffLegacyRoute(ctx: PageContextWithQueryMap) {
-    // Parameter order is based on the regex group number matched.
-    const params: GenerateUrlLegacyDiffViewParameters = {
-      changeNum: Number(ctx.params[0]) as NumericChangeId,
-      basePatchNum: convertToPatchSetNum(ctx.params[2]) as BasePatchSetNum,
-      patchNum: convertToPatchSetNum(ctx.params[4]),
-      path: ctx.params[5],
-      view: GerritView.DIFF,
-    };
-
-    const address = this._parseLineAddress(ctx.hash);
-    if (address) {
-      params.leftSide = address.leftSide;
-      params.lineNum = address.lineNum;
-    }
-
-    this._normalizeLegacyRouteParams(params);
-  }
-
   _handleDiffEditRoute(ctx: PageContextWithQueryMap) {
     // Parameter order is based on the regex group number matched.
     const project = ctx.params[0] as RepoName;
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
index 4c7855b..b91bf0c 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
@@ -192,7 +192,6 @@
       '_handleDiffRoute',
       '_handleDefaultRoute',
       '_handleChangeLegacyRoute',
-      '_handleDiffLegacyRoute',
       '_handleDocumentationRedirectRoute',
       '_handleDocumentationSearchRoute',
       '_handleDocumentationSearchRedirectRoute',
@@ -536,66 +535,6 @@
   });
 
   suite('param normalization', () => {
-    let projectLookupStub;
-    let generateUrlStub;
-
-    setup(() => {
-      projectLookupStub = stubRestApi('getFromProjectLookup');
-      generateUrlStub = sinon.stub(element, '_generateUrl');
-    });
-
-    suite('_normalizeLegacyRouteParams', () => {
-      let rangeStub;
-      let redirectStub;
-      let show404Stub;
-
-      setup(() => {
-        rangeStub = sinon.stub(element, '_normalizePatchRangeParams')
-            .returns(Promise.resolve());
-        redirectStub = sinon.stub(element, '_redirect');
-        show404Stub = sinon.stub(element, '_show404');
-      });
-
-      test('w/o changeNum', () => {
-        projectLookupStub.returns(Promise.resolve('foo/bar'));
-        const params = {};
-        return element._normalizeLegacyRouteParams(params).then(() => {
-          assert.isFalse(generateUrlStub.calledOnce);
-          assert.isFalse(projectLookupStub.called);
-          assert.isFalse(rangeStub.called);
-          assert.isFalse(redirectStub.called);
-          assert.isFalse(show404Stub.called);
-        });
-      });
-
-      test('w/ changeNum', () => {
-        projectLookupStub.returns(Promise.resolve('foo/bar'));
-        const params = {changeNum: 1234};
-
-        return element._normalizeLegacyRouteParams(params).then(() => {
-          assert.isTrue(generateUrlStub.calledOnce);
-          const updatedParams = generateUrlStub.lastCall.args[0];
-          assert.isTrue(projectLookupStub.called);
-          assert.isTrue(rangeStub.called);
-          assert.equal(updatedParams.project, 'foo/bar');
-          assert.isTrue(redirectStub.calledOnce);
-          assert.isFalse(show404Stub.called);
-        });
-      });
-
-      test('halts on project lookup failure', () => {
-        projectLookupStub.returns(Promise.resolve(undefined));
-        const params = {changeNum: 1234};
-        return element._normalizeLegacyRouteParams(params).then(() => {
-          assert.isFalse(generateUrlStub.calledOnce);
-          assert.isTrue(projectLookupStub.called);
-          assert.isFalse(rangeStub.called);
-          assert.isFalse(redirectStub.called);
-          assert.isTrue(show404Stub.calledOnce);
-        });
-      });
-    });
-
     suite('_normalizePatchRangeParams', () => {
       test('range n..n normalizes to n', () => {
         const params = {basePatchNum: 4, patchNum: 4};
@@ -1367,58 +1306,19 @@
         assert.isTrue(redirectStub.calledWithExactly('/c/12345'));
       });
 
-      test('_handleChangeLegacyRoute', () => {
-        const normalizeRouteStub = sinon.stub(element,
-            '_normalizeLegacyRouteParams');
+      test('_handleChangeLegacyRoute', async () => {
+        stubRestApi('getFromProjectLookup').returns(Promise.resolve('project'));
         const ctx = {
           params: [
             1234, // 0 Change number
-            null, // 1 Unused
-            null, // 2 Unused
-            6, // 3 Base patch number
-            null, // 4 Unused
-            9, // 5 Patch number
+            'comment/6789',
           ],
           querystring: '',
         };
         element._handleChangeLegacyRoute(ctx);
-        assert.isTrue(normalizeRouteStub.calledOnce);
-        assert.deepEqual(normalizeRouteStub.lastCall.args[0], {
-          changeNum: 1234,
-          basePatchNum: 6,
-          patchNum: 9,
-          view: GerritView.CHANGE,
-          querystring: '',
-        });
-      });
-
-      test('_handleDiffLegacyRoute', () => {
-        const normalizeRouteStub = sinon.stub(element,
-            '_normalizeLegacyRouteParams');
-        const ctx = {
-          params: [
-            1234, // 0 Change number
-            null, // 1 Unused
-            3, // 2 Base patch number
-            null, // 3 Unused
-            8, // 4 Patch number
-            'foo/bar', // 5 Diff path
-          ],
-          path: '/c/1234/3..8/foo/bar',
-          hash: 'b123',
-        };
-        element._handleDiffLegacyRoute(ctx);
-        assert.isFalse(redirectStub.called);
-        assert.isTrue(normalizeRouteStub.calledOnce);
-        assert.deepEqual(normalizeRouteStub.lastCall.args[0], {
-          changeNum: 1234,
-          basePatchNum: 3,
-          patchNum: 8,
-          view: GerritView.DIFF,
-          path: 'foo/bar',
-          lineNum: 123,
-          leftSide: true,
-        });
+        await flush();
+        assert.isTrue(redirectStub.calledWithExactly('/c/project/+/1234' +
+            '/comment/6789'));
       });
 
       test('_handleLegacyLinenum w/ @321', () => {
diff --git a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts
index 7b12b1117..aaeb924 100644
--- a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts
+++ b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts
@@ -31,10 +31,9 @@
   GrAutocomplete,
 } from '../../shared/gr-autocomplete/gr-autocomplete';
 import {getDocsBaseUrl} from '../../../utils/url-util';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 import {MergeabilityComputationBehavior} from '../../../constants/constants';
 import {appContext} from '../../../services/app-context';
-import {getKeyboardEvent} from '../../../utils/dom-util';
 
 // Possible static search options for auto complete, without negations.
 const SEARCH_OPERATORS: ReadonlyArray<string> = [
@@ -56,7 +55,6 @@
   'commentby:',
   'commit:',
   'committer:',
-  'conflicts:',
   'deleted:',
   'delta:',
   'dir:',
@@ -199,12 +197,14 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   constructor() {
     super();
     this.query = (input: string) => this._getSearchSuggestions(input);
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     this.restApiService.getConfig().then((serverConfig?: ServerInfo) => {
       const mergeability =
@@ -396,10 +396,10 @@
     });
   }
 
-  _handleSearch(e: CustomKeyboardEvent) {
-    const keyboardEvent = getKeyboardEvent(e);
+  _handleSearch(e: IronKeyboardEvent) {
+    const keyboardEvent = e.detail.keyboardEvent;
     if (
-      this.shouldSuppressKeyboardShortcut(e) ||
+      this.shortcuts.shouldSuppress(e) ||
       (this.modifierPressed(e) && !keyboardEvent.shiftKey)
     ) {
       return;
diff --git a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_test.ts b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_test.ts
index b5b0124..b6d0579 100644
--- a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar_test.ts
@@ -19,12 +19,7 @@
 import './gr-search-bar';
 import '../../../scripts/util';
 import {GrSearchBar} from './gr-search-bar';
-import {
-  TestKeyboardShortcutBinder,
-  stubRestApi,
-  mockPromise,
-} from '../../../test/test-utils';
-import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
+import {stubRestApi, mockPromise} from '../../../test/test-utils';
 import {_testOnly_clearDocsBaseUrlCache} from '../../../utils/url-util';
 import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
 import {
@@ -39,15 +34,6 @@
 suite('gr-search-bar tests', () => {
   let element: GrSearchBar;
 
-  suiteSetup(() => {
-    const kb = TestKeyboardShortcutBinder.push();
-    kb.bindShortcut(Shortcut.SEARCH, '/');
-  });
-
-  suiteTeardown(() => {
-    TestKeyboardShortcutBinder.pop();
-  });
-
   setup(async () => {
     element = basicFixture.instantiate();
     await flush();
diff --git a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts
index 1c25755..f5072b9 100644
--- a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts
+++ b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts
@@ -150,7 +150,7 @@
     });
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     this.refitOverlay = () => {
       // re-center the dialog as content changed
diff --git a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_test.ts b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_test.ts
index d3d7615..94d37f5 100644
--- a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_test.ts
+++ b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog_test.ts
@@ -186,6 +186,7 @@
         })
       );
       element._isApplyFixLoading = true;
+      await flush();
       const button = getConfirmButton();
       assert.isTrue(button.hasAttribute('disabled'));
       assert.equal(button.getAttribute('title'), '');
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer.ts
index 480e26c..de7d007 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer.ts
@@ -15,9 +15,17 @@
  * limitations under the License.
  */
 import {DiffLayer, DiffLayerListener} from '../../../types/types';
-import {GrDiffLine, Side, TokenHighlightedListener} from '../../../api/diff';
+import {GrDiffLine, Side, TokenHighlightListener} from '../../../api/diff';
+import {assertIsDefined} from '../../../utils/common-util';
 import {GrAnnotation} from '../gr-diff-highlight/gr-annotation';
 import {debounce, DelayedTask} from '../../../utils/async-util';
+
+import {
+  getLineElByChild,
+  getSideByLineEl,
+  getPreviousContentNodes,
+} from '../gr-diff/gr-diff-utils';
+
 import {
   getLineNumberByChild,
   lineNumberToNumber,
@@ -66,7 +74,7 @@
   private currentHighlight?: string;
 
   /** Trigger when a new token starts or stoped being highlighted.*/
-  private readonly tokenHighlightedListener?: TokenHighlightedListener;
+  private readonly tokenHighlightListener?: TokenHighlightListener;
 
   /**
    * The line of the currently highlighted token. We store this in order to
@@ -100,9 +108,9 @@
 
   constructor(
     container: HTMLElement = document.documentElement,
-    tokenHighlightedListener?: TokenHighlightedListener
+    tokenHighlightListener?: TokenHighlightListener
   ) {
-    this.tokenHighlightedListener = tokenHighlightedListener;
+    this.tokenHighlightListener = tokenHighlightListener;
     container.addEventListener('click', e => {
       this.handleContainerClick(e);
     });
@@ -260,18 +268,42 @@
     const oldLineNumber = this.currentHighlightLineNumber;
     this.currentHighlight = newHighlight;
     this.currentHighlightLineNumber = newLineNumber;
-
-    if (this.tokenHighlightedListener) {
-      this.tokenHighlightedListener(
-        newHighlight,
-        newLineNumber,
-        newHoveredElement
-      );
-    }
+    this.triggerTokenHighlightEvent(
+      newHighlight,
+      newLineNumber,
+      newHoveredElement
+    );
     this.notifyForToken(oldHighlight, oldLineNumber);
     this.notifyForToken(newHighlight, newLineNumber);
   }
 
+  triggerTokenHighlightEvent(
+    token: string | undefined,
+    line: number,
+    element: Element | undefined
+  ) {
+    if (!this.tokenHighlightListener) {
+      return;
+    }
+    if (!token || !element) {
+      this.tokenHighlightListener(undefined);
+      return;
+    }
+    const previousTextLength = getPreviousContentNodes(element)
+      .map(sib => sib.textContent!.length)
+      .reduce((partial_sum, a) => partial_sum + a, 0);
+    const lineEl = getLineElByChild(element);
+    assertIsDefined(lineEl, 'Line element should be found!');
+    const side = getSideByLineEl(lineEl);
+    const range = {
+      start_line: line,
+      start_column: previousTextLength + 1, // 1-based inclusive
+      end_line: line,
+      end_column: previousTextLength + token.length, // 1-based inclusive
+    };
+    this.tokenHighlightListener({token, element, side, range});
+  }
+
   getSortedLinesForSide(
     lineMapping: Map<string, Set<number>>,
     token: string | undefined,
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer_test.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer_test.ts
index 4f44665..2993d35 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer_test.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/token-highlight-layer_test.ts
@@ -17,7 +17,7 @@
 
 import '../../../test/common-test-setup-karma';
 import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
-import {Side} from '../../../api/diff';
+import {Side, TokenHighlightEventDetails} from '../../../api/diff';
 import {GrDiffLine, GrDiffLineType} from '../gr-diff/gr-diff-line.js';
 import {HOVER_DELAY_MS, TokenHighlightLayer} from './token-highlight-layer';
 import {GrAnnotation} from '../gr-diff-highlight/gr-annotation';
@@ -66,14 +66,12 @@
   let container: HTMLElement;
   let listener: MockListener;
   let highlighter: TokenHighlightLayer;
-  let tokenHighlightingCalls: any[] = [];
+  let tokenHighlightingCalls: {details?: TokenHighlightEventDetails}[] = [];
 
-  function tokenHighlightedListener(
-    newHighlight: string | undefined,
-    newLineNumber: number,
-    hoveredElement?: Element
+  function tokenHighlightListener(
+    highlightDetails?: TokenHighlightEventDetails
   ) {
-    tokenHighlightingCalls.push({newHighlight, newLineNumber, hoveredElement});
+    tokenHighlightingCalls.push({details: highlightDetails});
   }
 
   setup(async () => {
@@ -81,7 +79,7 @@
     tokenHighlightingCalls = [];
     container = document.createElement('div');
     document.body.appendChild(container);
-    highlighter = new TokenHighlightLayer(container, tokenHighlightedListener);
+    highlighter = new TokenHighlightLayer(container, tokenHighlightListener);
     highlighter.addListener((...args) => listener.notify(...args));
   });
 
@@ -107,10 +105,13 @@
     const lineId = createLineId();
     const template = html`
       <div class="line">
-        <div data-value=${line} class="lineNum"></div>
-        <div id=${lineId} class="line-content">${text}</div>
+        <div data-value=${line} class="lineNum right"></div>
+        <div class="content">
+          <div id=${lineId} class="contentText">${text}</div>
+        </div>
       </div>
     `;
+
     const div = document.createElement('div');
     render(template, div);
     container.appendChild(div);
@@ -277,19 +278,16 @@
       assert.equal(tokenHighlightingCalls.length, 0);
       clock.tick(HOVER_DELAY_MS);
       assert.equal(tokenHighlightingCalls.length, 1);
-      assert.deepEqual(tokenHighlightingCalls[0], {
-        newHighlight: 'words',
-        newLineNumber: 1,
-        hoveredElement: words1,
+      assert.deepEqual(tokenHighlightingCalls[0].details, {
+        token: 'words',
+        side: Side.RIGHT,
+        element: words1,
+        range: {start_line: 1, start_column: 5, end_line: 1, end_column: 9},
       });
 
       MockInteractions.click(container);
       assert.equal(tokenHighlightingCalls.length, 2);
-      assert.deepEqual(tokenHighlightingCalls[1], {
-        newHighlight: undefined,
-        newLineNumber: 0,
-        hoveredElement: undefined,
-      });
+      assert.deepEqual(tokenHighlightingCalls[1].details, undefined);
     });
 
     test('clicking clears highlight', async () => {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-annotation.ts b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-annotation.ts
index 5e81871..79e7dbc 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-annotation.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-annotation.ts
@@ -134,7 +134,7 @@
 
       if (node instanceof Text) {
         this._annotateText(node, offset, subLength, cssClass);
-      } else if (node instanceof HTMLElement) {
+      } else if (node instanceof Element) {
         this.annotateElement(node, offset, subLength, cssClass);
       }
 
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
index 463163c..b1bad1c 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
@@ -56,6 +56,7 @@
   PatchRange,
   PatchSetNum,
   RepoName,
+  UrlEncodedCommentId,
 } from '../../../types/common';
 import {
   DiffInfo,
@@ -223,9 +224,6 @@
   @property({type: Boolean})
   _loggedIn = false;
 
-  @property({type: Boolean})
-  disableTokenHighlighting = false;
-
   @property({type: String})
   _errorMessage: string | null = null;
 
@@ -303,11 +301,6 @@
     this.addEventListener('diff-context-expanded', event =>
       this._handleDiffContextExpanded(event)
     );
-    appContext.restApiService.getPreferences().then(prefs => {
-      if (prefs?.disable_token_highlighting) {
-        this.disableTokenHighlighting = prefs.disable_token_highlighting;
-      }
-    });
   }
 
   override ready() {
@@ -335,18 +328,21 @@
     super.disconnectedCallback();
   }
 
-  initLayers() {
-    return getPluginLoader()
-      .awaitPluginsLoaded()
-      .then(() => {
-        assertIsDefined(this.path, 'path');
-        this._layers = this._getLayers(this.path);
-        this._coverageRanges = [];
-        // We kick off fetching the data here, but we don't return the promise,
-        // so awaiting initLayers() will not wait for coverage data to be
-        // completely loaded.
-        this._getCoverageData();
-      });
+  async initLayers() {
+    const preferencesPromise = appContext.restApiService.getPreferences();
+    await getPluginLoader().awaitPluginsLoaded();
+    const prefs = await preferencesPromise;
+    const enableTokenHighlight =
+      appContext.flagsService.isEnabled(KnownExperimentId.TOKEN_HIGHLIGHTING) &&
+      !prefs?.disable_token_highlighting;
+
+    assertIsDefined(this.path, 'path');
+    this._layers = this.getLayers(this.path, enableTokenHighlight);
+    this._coverageRanges = [];
+    // We kick off fetching the data here, but we don't return the promise,
+    // so awaiting initLayers() will not wait for coverage data to be
+    // completely loaded.
+    this._getCoverageData();
   }
 
   diffChanged(diff?: DiffInfo) {
@@ -418,12 +414,9 @@
     }
   }
 
-  private _getLayers(path: string): DiffLayer[] {
+  private getLayers(path: string, enableTokenHighlight: boolean): DiffLayer[] {
     const layers = [];
-    if (
-      appContext.flagsService.isEnabled(KnownExperimentId.TOKEN_HIGHLIGHTING) &&
-      !this.disableTokenHighlighting
-    ) {
+    if (enableTokenHighlight) {
       layers.push(new TokenHighlightLayer(this));
     }
     layers.push(this.syntaxLayer);
@@ -738,9 +731,24 @@
   }
 
   _threadsChanged(threads: CommentThread[]) {
-    const threadEls = new Set<Object>();
+    const threadEls = new Set<GrCommentThread>();
+    const rootIdToThreadEl = new Map<UrlEncodedCommentId, GrCommentThread>();
+    for (const threadEl of this.getThreadEls()) {
+      if (threadEl.rootId) {
+        rootIdToThreadEl.set(threadEl.rootId, threadEl);
+      }
+    }
     for (const thread of threads) {
-      threadEls.add(this._getOrCreateThread(thread));
+      const existingThreadEl =
+        thread.rootId && rootIdToThreadEl.get(thread.rootId);
+      if (existingThreadEl) {
+        this._updateThreadElement(existingThreadEl, thread);
+        threadEls.add(existingThreadEl);
+      } else {
+        const threadEl = this._createThreadElement(thread);
+        this._attachThreadElement(threadEl);
+        threadEls.add(threadEl);
+      }
     }
     // Remove all threads that are no longer existing.
     for (const threadEl of this.getThreadEls()) {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
index 344f9d8..8901636 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
@@ -17,19 +17,16 @@
 
 import '../../../test/common-test-setup-karma.js';
 import './gr-diff-host.js';
-import {GrDiffBuilderImage} from '../gr-diff-builder/gr-diff-builder-image.js';
-import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
+
 import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
-import {Side, createDefaultDiffPrefs} from '../../../constants/constants.js';
-import {createChange} from '../../../test/test-data-generators.js';
-import {CoverageType} from '../../../types/types.js';
-import {
-  addListenerForTest,
-  mockPromise,
-  stubRestApi,
-} from '../../../test/test-utils.js';
-import {EditPatchSetNum, ParentPatchSetNum} from '../../../types/common.js';
+import {createDefaultDiffPrefs, Side} from '../../../constants/constants.js';
 import {_testOnly_resetState} from '../../../services/comments/comments-model.js';
+import {createChange, createComment, createCommentThread} from '../../../test/test-data-generators.js';
+import {addListenerForTest, mockPromise, stubRestApi} from '../../../test/test-utils.js';
+import {EditPatchSetNum, ParentPatchSetNum} from '../../../types/common.js';
+import {CoverageType} from '../../../types/types.js';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
+import {GrDiffBuilderImage} from '../gr-diff-builder/gr-diff-builder-image.js';
 
 const basicFixture = fixtureFromElement('gr-diff-host');
 
@@ -1127,6 +1124,43 @@
       assert.equal(threads[0].path, element.file.path);
     });
 
+    test('multiple threads created on the same range', () => {
+      element.patchRange = {
+        basePatchNum: 2,
+        patchNum: 3,
+      };
+      element.file = {basePath: 'file_renamed.txt', path: element.path};
+
+      const comment = createComment();
+      comment.range = {
+        start_line: 1,
+        start_character: 1,
+        end_line: 2,
+        end_character: 2,
+      };
+      const thread = createCommentThread([comment]);
+      element.threads = [thread];
+
+      let threads = dom(element.$.diff)
+          .queryDistributedElements('gr-comment-thread');
+
+      assert.equal(threads.length, 1);
+      element.threads= [...element.threads, thread];
+
+      threads = dom(element.$.diff)
+          .queryDistributedElements('gr-comment-thread');
+      // Threads have same rootId so element is reused
+      assert.equal(threads.length, 1);
+
+      const newThread = {...thread};
+      newThread.rootId = 'differentRootId';
+      element.threads= [...element.threads, newThread];
+      threads = dom(element.$.diff)
+          .queryDistributedElements('gr-comment-thread');
+      // New thread has a different rootId
+      assert.equal(threads.length, 2);
+    });
+
     test('thread should use new file path if first created' +
     'on patch set (left) but is base', () => {
       const diffSide = Side.LEFT;
@@ -1143,8 +1177,8 @@
         },
       }));
 
-      const threads = dom(element.$.diff)
-          .queryDistributedElements('gr-comment-thread');
+      const threads =
+          dom(element.$.diff).queryDistributedElements('gr-comment-thread');
 
       assert.equal(threads.length, 1);
       assert.equal(threads[0].diffSide, diffSide);
@@ -1167,8 +1201,8 @@
         },
       }));
 
-      const threads = dom(element.$.diff)
-          .queryDistributedElements('gr-comment-thread');
+      const threads =
+          dom(element.$.diff).queryDistributedElements('gr-comment-thread');
       assert.equal(threads.length, 0);
       assert.isTrue(alertSpy.called);
     });
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-image-viewer/gr-image-viewer.ts b/polygerrit-ui/app/elements/diff/gr-diff-image-viewer/gr-image-viewer.ts
index ba1abd0..32f5f39 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-image-viewer/gr-image-viewer.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-image-viewer/gr-image-viewer.ts
@@ -267,11 +267,11 @@
       outline: 1px solid transparent;
       border: 1px solid var(--primary-button-background-color);
     }
-    paper-button[unelevated] {
+    paper-button.unelevated {
       color: var(--primary-button-text-color);
       background-color: var(--primary-button-background-color);
     }
-    paper-button[outlined] {
+    paper-button.outlined {
       color: var(--primary-button-background-color);
     }
     #version-switcher {
@@ -448,12 +448,20 @@
 
     // This uses the unelevated and outlined attributes from mwc-button with
     // manual styling, for a more seamless transition later.
+    const leftClasses = {
+      left: true,
+      unelevated: this.baseSelected,
+      outlined: !this.baseSelected,
+    };
+    const rightClasses = {
+      right: true,
+      unelevated: !this.baseSelected,
+      outlined: this.baseSelected,
+    };
     const versionToggle = html`
       <div id="version-switcher">
         <paper-button
-          class="left"
-          ?unelevated=${this.baseSelected}
-          ?outlined=${!this.baseSelected}
+          class="${classMap(leftClasses)}"
           @click="${this.selectBase}"
         >
           Base
@@ -461,9 +469,7 @@
         <paper-fab mini icon="gr-icons:swapHoriz" @click="${this.manualBlink}">
         </paper-fab>
         <paper-button
-          class="right"
-          ?unelevated=${!this.baseSelected}
-          ?outlined=${this.baseSelected}
+          class="${classMap(rightClasses)}"
           @click="${this.selectRevision}"
         >
           Revision
@@ -509,7 +515,7 @@
         <paper-listbox
           slot="dropdown-content"
           selected="fit"
-          attr-for-selected="value"
+          .attrForSelected="${'value'}"
           @selected-changed="${this.zoomControlChanged}"
         >
           ${this.zoomLevels.map(
@@ -579,6 +585,7 @@
 
     // To pass CSS mixins for @apply to Polymer components, they need to appear
     // in <style> inside the template.
+    /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
         paper-item {
@@ -648,7 +655,9 @@
   // We don't want property changes in updateSizes() to trigger infinite update
   // loops, so we perform this in update() instead of updated().
   override update(changedProperties: PropertyValues) {
+    // eslint-disable-next-line lit/no-property-change-update
     if (!this.baseUrl) this.baseSelected = false;
+    // eslint-disable-next-line lit/no-property-change-update
     if (!this.revisionUrl) this.baseSelected = true;
     this.updateSizes();
     super.update(changedProperties);
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts
index 4e2b6a1..8a6d95d 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_html.ts
@@ -30,28 +30,34 @@
       width: 1.3rem;
     }
   </style>
-  <gr-button
-    id="sideBySideBtn"
-    link=""
+  <gr-tooltip-content
     has-tooltip=""
-    position-below="[[showTooltipBelow]]"
-    class$="[[_computeSideBySideSelected(mode)]]"
     title="Side-by-side diff"
-    aria-pressed$="[[isSideBySideSelected(mode)]]"
-    on-click="_handleSideBySideTap"
+    position-below="[[showTooltipBelow]]"
   >
-    <iron-icon icon="gr-icons:side-by-side"></iron-icon>
-  </gr-button>
-  <gr-button
-    id="unifiedBtn"
-    link=""
+    <gr-button
+      id="sideBySideBtn"
+      link=""
+      class$="[[_computeSideBySideSelected(mode)]]"
+      aria-pressed$="[[isSideBySideSelected(mode)]]"
+      on-click="_handleSideBySideTap"
+    >
+      <iron-icon icon="gr-icons:side-by-side"></iron-icon>
+    </gr-button>
+  </gr-tooltip-content>
+  <gr-tooltip-content
     has-tooltip=""
     position-below="[[showTooltipBelow]]"
     title="Unified diff"
-    class$="[[_computeUnifiedSelected(mode)]]"
-    aria-pressed$="[[isUnifiedSelected(mode)]]"
-    on-click="_handleUnifiedTap"
   >
-    <iron-icon icon="gr-icons:unified"></iron-icon>
-  </gr-button>
+    <gr-button
+      id="unifiedBtn"
+      link=""
+      class$="[[_computeUnifiedSelected(mode)]]"
+      aria-pressed$="[[isUnifiedSelected(mode)]]"
+      on-click="_handleUnifiedTap"
+    >
+      <iron-icon icon="gr-icons:unified"></iron-icon>
+    </gr-button>
+  </gr-tooltip-content>
 `;
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
index b1d71cc..e2baec9 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
@@ -16,6 +16,7 @@
  */
 import '@polymer/iron-dropdown/iron-dropdown';
 import '@polymer/iron-input/iron-input';
+import '../../../styles/gr-a11y-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-dropdown/gr-dropdown';
@@ -36,6 +37,7 @@
 import {
   KeyboardShortcutMixin,
   Shortcut,
+  ShortcutSection,
 } from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {
   GeneratedWebLink,
@@ -97,14 +99,15 @@
 } from '../../../utils/comment-util';
 import {AppElementParams} from '../../gr-app-types';
 import {
-  CustomKeyboardEvent,
+  IronKeyboardEventListener,
+  IronKeyboardEvent,
   EventType,
   OpenFixPreviewEvent,
 } from '../../../types/events';
 import {fireAlert, fireEvent, fireTitleChange} from '../../../utils/event-util';
 import {GerritView} from '../../../services/router/router-model';
 import {assertIsDefined} from '../../../utils/common-util';
-import {toggleClass, getKeyboardEvent} from '../../../utils/dom-util';
+import {toggleClass} from '../../../utils/dom-util';
 import {CursorMoveResult} from '../../../api/core';
 import {throttleWrap} from '../../../utils/async-util';
 import {changeComments$} from '../../../services/comments/comments-model';
@@ -340,7 +343,9 @@
 
   private readonly commentsService = appContext.commentsService;
 
-  _throttledToggleFileReviewed?: EventListener;
+  private readonly shortcuts = appContext.shortcutsService;
+
+  _throttledToggleFileReviewed?: IronKeyboardEventListener;
 
   _onRenderHandler?: EventListener;
 
@@ -351,7 +356,7 @@
   override connectedCallback() {
     super.connectedCallback();
     this._throttledToggleFileReviewed = throttleWrap(e =>
-      this._handleToggleFileReviewed(e as CustomKeyboardEvent)
+      this._handleToggleFileReviewed(e)
     );
     this._getLoggedIn().then(loggedIn => {
       this._loggedIn = loggedIn;
@@ -517,38 +522,38 @@
     );
   }
 
-  _handleToggleFileReviewed(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleToggleFileReviewed(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     e.preventDefault();
     this._setReviewed(!this.$.reviewed.checked);
   }
 
-  _handleEscKey(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleEscKey(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     e.preventDefault();
     this.$.diffHost.displayLine = false;
   }
 
-  _handleLeftPane(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleLeftPane(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     e.preventDefault();
     this.cursor.moveLeft();
   }
 
-  _handleRightPane(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleRightPane(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     e.preventDefault();
     this.cursor.moveRight();
   }
 
-  _handlePrevLineOrFileWithComments(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handlePrevLineOrFileWithComments(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     if (
       e.detail.keyboardEvent?.shiftKey &&
@@ -567,8 +572,8 @@
     this.cursor.moveUp();
   }
 
-  _handleVisibleLine(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleVisibleLine(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     e.preventDefault();
     this.cursor.moveToVisibleArea();
@@ -578,8 +583,8 @@
     this.$.applyFixDialog.open(e);
   }
 
-  _handleNextLineOrFileWithComments(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleNextLineOrFileWithComments(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     if (
       e.detail.keyboardEvent?.shiftKey &&
@@ -637,39 +642,41 @@
     );
   }
 
-  _handleNewComment(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
-    if (this.modifierPressed(e)) return;
+  _handleNewComment(ike: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(ike)) return;
+    if (this.modifierPressed(ike)) return;
 
-    e.preventDefault();
+    ike.preventDefault();
     this.classList.remove('hideComments');
     this.cursor.createCommentInPlace();
   }
 
-  _handlePrevFile(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handlePrevFile(ike: IronKeyboardEvent) {
+    const ke = ike.detail.keyboardEvent;
+    if (this.shortcuts.shouldSuppress(ike)) return;
     // Check for meta key to avoid overriding native chrome shortcut.
-    if (getKeyboardEvent(e).metaKey) return;
+    if (ke.metaKey) return;
     if (!this._path) return;
     if (!this._fileList) return;
 
-    e.preventDefault();
+    ike.preventDefault();
     this._navToFile(this._path, this._fileList, -1);
   }
 
-  _handleNextFile(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleNextFile(ike: IronKeyboardEvent) {
+    const ke = ike.detail.keyboardEvent;
+    if (this.shortcuts.shouldSuppress(ike)) return;
     // Check for meta key to avoid overriding native chrome shortcut.
-    if (getKeyboardEvent(e).metaKey) return;
+    if (ke.metaKey) return;
     if (!this._path) return;
     if (!this._fileList) return;
 
-    e.preventDefault();
+    ike.preventDefault();
     this._navToFile(this._path, this._fileList, 1);
   }
 
-  _handleNextChunkOrCommentThread(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleNextChunkOrCommentThread(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     e.preventDefault();
     if (e.detail.keyboardEvent?.shiftKey) {
@@ -729,8 +736,8 @@
     this._navToFile(this._path, unreviewedFiles, direction === 'next' ? 1 : -1);
   }
 
-  _handlePrevChunkOrCommentThread(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handlePrevChunkOrCommentThread(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     e.preventDefault();
     if (e.detail.keyboardEvent?.shiftKey) {
@@ -745,8 +752,8 @@
   }
 
   // Similar to gr-change-view._handleOpenReplyDialog
-  _handleOpenReplyDialog(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleOpenReplyDialog(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
     this._getLoggedIn().then(isLoggedIn => {
       if (!isLoggedIn) {
@@ -760,16 +767,16 @@
     });
   }
 
-  _handleToggleLeftPane(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleToggleLeftPane(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (!e.detail.keyboardEvent?.shiftKey) return;
 
     e.preventDefault();
     this.$.diffHost.toggleLeftDiff();
   }
 
-  _handleOpenDownloadDialog(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleOpenDownloadDialog(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     this.set('changeViewState.showDownloadDialog', true);
@@ -777,16 +784,16 @@
     this._navToChangeView();
   }
 
-  _handleUpToChange(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleUpToChange(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     e.preventDefault();
     this._navToChangeView();
   }
 
-  _handleCommaKey(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleCommaKey(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
     if (this._diffPrefsDisabled) return;
 
@@ -794,8 +801,8 @@
     this.$.diffPreferencesDialog.open();
   }
 
-  _handleToggleDiffMode(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleToggleDiffMode(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     e.preventDefault();
@@ -1691,28 +1698,28 @@
     this._loadBlame();
   }
 
-  _handleToggleBlame(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleToggleBlame(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     this._toggleBlame();
   }
 
-  _handleToggleHideAllCommentThreads(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleToggleHideAllCommentThreads(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
 
     toggleClass(this, 'hideComments');
   }
 
-  _handleOpenFileList(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleOpenFileList(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (this.modifierPressed(e)) return;
     this.$.dropdown.open();
   }
 
-  _handleDiffAgainstBase(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleDiffAgainstBase(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (!this._change) return;
     if (!this._path) return;
     if (!this._patchRange) return;
@@ -1728,8 +1735,8 @@
     );
   }
 
-  _handleDiffBaseAgainstLeft(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleDiffBaseAgainstLeft(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (!this._change) return;
     if (!this._path) return;
     if (!this._patchRange) return;
@@ -1749,8 +1756,8 @@
     );
   }
 
-  _handleDiffAgainstLatest(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleDiffAgainstLatest(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (!this._change) return;
     if (!this._path) return;
     if (!this._patchRange) return;
@@ -1769,8 +1776,8 @@
     );
   }
 
-  _handleDiffRightAgainstLatest(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleDiffRightAgainstLatest(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (!this._change) return;
     if (!this._path) return;
     if (!this._patchRange) return;
@@ -1788,8 +1795,8 @@
     );
   }
 
-  _handleDiffBaseAgainstLatest(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleDiffBaseAgainstLatest(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     if (!this._change) return;
     if (!this._path) return;
     if (!this._patchRange) return;
@@ -1826,8 +1833,8 @@
     return '';
   }
 
-  _handleToggleAllDiffContext(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleToggleAllDiffContext(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
 
     this.$.diffHost.toggleAllContext();
   }
@@ -1836,8 +1843,8 @@
     return disableDiffPrefs || !loggedIn;
   }
 
-  _handleNextUnreviewedFile(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) return;
+  _handleNextUnreviewedFile(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     this._setReviewed(true);
     this.navigateToUnreviewedFile('next');
   }
@@ -1897,6 +1904,10 @@
   _computeTruncatedPath(path?: string) {
     return path ? computeTruncatedPath(path) : '';
   }
+
+  createTitle(shortcutName: Shortcut, section: ShortcutSection) {
+    return this.shortcuts.createTitle(shortcutName, section);
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
index 7e0ca10..b25be5a8 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-a11y-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       display: block;
@@ -138,11 +141,6 @@
     .separator.hide {
       display: none;
     }
-    gr-dropdown-list {
-      --trigger-style: {
-        text-transform: none;
-      }
-    }
     .editButtona a {
       text-decoration: none;
     }
@@ -351,15 +349,15 @@
           hidden=""
         >
           <span class="preferences desktop">
-            <gr-button
-              link=""
-              class="prefsButton"
+            <gr-tooltip-content
               has-tooltip=""
               position-below=""
               title="Diff preferences"
-              on-click="_handlePrefsTap"
-              ><iron-icon icon="gr-icons:settings"></iron-icon
-            ></gr-button>
+            >
+              <gr-button link="" class="prefsButton" on-click="_handlePrefsTap"
+                ><iron-icon icon="gr-icons:settings"></iron-icon
+              ></gr-button>
+            </gr-tooltip-content>
           </span>
         </span>
         <gr-endpoint-decorator name="annotation-toggler">
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
index a3de30a..735624a 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
@@ -19,8 +19,7 @@
 import './gr-diff-view.js';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
 import {ChangeStatus} from '../../../constants/constants.js';
-import {TestKeyboardShortcutBinder, stubRestApi} from '../../../test/test-utils.js';
-import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
+import {stubRestApi} from '../../../test/test-utils.js';
 import {ChangeComments} from '../gr-comment-api/gr-comment-api.js';
 import {GerritView} from '../../../services/router/router-model.js';
 import {
@@ -41,42 +40,6 @@
     let clock;
     let diffCommentsStub;
 
-    suiteSetup(() => {
-      const kb = TestKeyboardShortcutBinder.push();
-      kb.bindShortcut(Shortcut.LEFT_PANE, 'shift+left');
-      kb.bindShortcut(Shortcut.RIGHT_PANE, 'shift+right');
-      kb.bindShortcut(Shortcut.NEXT_LINE, 'j', 'down');
-      kb.bindShortcut(Shortcut.PREV_LINE, 'k', 'up');
-      kb.bindShortcut(Shortcut.NEXT_FILE_WITH_COMMENTS, 'shift+j');
-      kb.bindShortcut(Shortcut.PREV_FILE_WITH_COMMENTS, 'shift+k');
-      kb.bindShortcut(Shortcut.NEW_COMMENT, 'c');
-      kb.bindShortcut(Shortcut.SAVE_COMMENT, 'ctrl+s');
-      kb.bindShortcut(Shortcut.NEXT_FILE, ']');
-      kb.bindShortcut(Shortcut.PREV_FILE, '[');
-      kb.bindShortcut(Shortcut.NEXT_CHUNK, 'n');
-      kb.bindShortcut(Shortcut.NEXT_COMMENT_THREAD, 'shift+n');
-      kb.bindShortcut(Shortcut.PREV_CHUNK, 'p');
-      kb.bindShortcut(Shortcut.PREV_COMMENT_THREAD, 'shift+p');
-      kb.bindShortcut(Shortcut.OPEN_REPLY_DIALOG, 'a');
-      kb.bindShortcut(Shortcut.OPEN_DOWNLOAD_DIALOG, 'd');
-      kb.bindShortcut(Shortcut.TOGGLE_LEFT_PANE, 'shift+a');
-      kb.bindShortcut(Shortcut.UP_TO_CHANGE, 'u');
-      kb.bindShortcut(Shortcut.OPEN_DIFF_PREFS, ',');
-      kb.bindShortcut(Shortcut.TOGGLE_DIFF_MODE, 'm');
-      kb.bindShortcut(Shortcut.TOGGLE_FILE_REVIEWED, 'r');
-      kb.bindShortcut(Shortcut.TOGGLE_ALL_DIFF_CONTEXT, 'shift+x');
-      kb.bindShortcut(Shortcut.EXPAND_ALL_COMMENT_THREADS, 'e');
-      kb.bindShortcut(Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS, 'h');
-      kb.bindShortcut(Shortcut.COLLAPSE_ALL_COMMENT_THREADS, 'shift+e');
-      kb.bindShortcut(Shortcut.NEXT_UNREVIEWED_FILE, 'shift+m');
-      kb.bindShortcut(Shortcut.TOGGLE_BLAME, 'b');
-      kb.bindShortcut(Shortcut.OPEN_FILE_LIST, 'f');
-    });
-
-    suiteTeardown(() => {
-      TestKeyboardShortcutBinder.pop();
-    });
-
     const PARENT = 'PARENT';
 
     function getFilesFromFileList(fileList) {
@@ -504,16 +467,16 @@
       sinon.stub(element, '_setReviewed');
       sinon.spy(element, '_handleToggleFileReviewed');
       element.$.reviewed.checked = false;
-      MockInteractions.pressAndReleaseKeyOn(element, 82, 'shift', 'r');
+      MockInteractions.keyUpOn(element, 82, 'shift', 'r');
       assert.isFalse(element._setReviewed.called);
       assert.isTrue(element._handleToggleFileReviewed.calledOnce);
 
-      MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+      MockInteractions.keyUpOn(element, 82, null, 'r');
       assert.isTrue(element._handleToggleFileReviewed.calledOnce);
 
       clock.tick(1000);
 
-      MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
+      MockInteractions.keyUpOn(element, 82, null, 'r');
       assert.isTrue(element._handleToggleFileReviewed.calledTwice);
       assert.isTrue(element._setReviewed.called);
       assert.equal(element._setReviewed.lastCall.args[0], true);
@@ -573,7 +536,6 @@
         basePatchNum: 5,
         patchNum: 10,
       };
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
       const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
       element._handleDiffAgainstBase(new CustomEvent(''));
       const args = diffNavStub.getCall(0).args;
@@ -590,7 +552,6 @@
         basePatchNum: 5,
         patchNum: 10,
       };
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
       const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
       element._handleDiffAgainstLatest(new CustomEvent(''));
       const args = diffNavStub.getCall(0).args;
@@ -608,7 +569,6 @@
         basePatchNum: 1,
       };
       element.params = {};
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
       const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
       element._handleDiffBaseAgainstLeft(new CustomEvent(''));
       assert(diffNavStub.called);
@@ -631,7 +591,6 @@
           sinon.stub(element, '_paramsChanged');
           element.params = {commentLink: true, view: GerritView.DIFF};
           element._focusLineNum = 10;
-          sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
           const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
           element._handleDiffBaseAgainstLeft(new CustomEvent(''));
           assert(diffNavStub.called);
@@ -650,7 +609,6 @@
         basePatchNum: 1,
         patchNum: 3,
       };
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
       const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
       element._handleDiffRightAgainstLatest(new CustomEvent(''));
       assert(diffNavStub.called);
@@ -668,7 +626,6 @@
         basePatchNum: 1,
         patchNum: 3,
       };
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
       const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
       element._handleDiffBaseAgainstLatest(new CustomEvent(''));
       assert(diffNavStub.called);
@@ -682,7 +639,7 @@
       sinon.stub(element, '_getLoggedIn').returns(Promise.resolve(false));
       const loggedInErrorSpy = sinon.spy();
       element.addEventListener('show-auth-required', loggedInErrorSpy);
-      MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
+      MockInteractions.keyUpOn(element, 65, null, 'a');
       await flush();
       assert.isTrue(changeNavStub.notCalled, 'The `a` keyboard shortcut ' +
         'should only work when the user is logged in.');
@@ -708,7 +665,7 @@
       sinon.stub(element, '_getLoggedIn').returns(Promise.resolve(true));
       const loggedInErrorSpy = sinon.spy();
       element.addEventListener('show-auth-required', loggedInErrorSpy);
-      MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
+      MockInteractions.keyUpOn(element, 65, null, 'a');
       await flush();
       assert.isTrue(element.changeViewState.showReplyDialog);
       assert(changeNavStub.lastCall.calledWithExactly(element._change, 10,
@@ -734,7 +691,7 @@
           sinon.stub(element, '_getLoggedIn').returns(Promise.resolve(true));
           const loggedInErrorSpy = sinon.spy();
           element.addEventListener('show-auth-required', loggedInErrorSpy);
-          MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
+          MockInteractions.keyUpOn(element, 65, null, 'a');
           await flush();
           assert.isTrue(element.changeViewState.showReplyDialog);
           assert(changeNavStub.lastCall.calledWithExactly(element._change, 1,
@@ -798,7 +755,7 @@
       'Should navigate to /c/42/5..10');
 
       assert.isUndefined(element.changeViewState.showDownloadDialog);
-      MockInteractions.pressAndReleaseKeyOn(element, 68, null, 'd');
+      MockInteractions.keyUpOn(element, 68, null, 'd');
       assert.isTrue(element.changeViewState.showDownloadDialog);
     });
 
@@ -1520,8 +1477,9 @@
     });
 
     test('_handleToggleDiffMode', () => {
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-      const e = {preventDefault: () => {}};
+      const e = new CustomEvent('keydown', {
+        detail: {keyboardEvent: new KeyboardEvent('keydown'), key: 'x'},
+      });
       // Initial state.
       assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
 
@@ -1732,7 +1690,7 @@
       test('toggle blame with shortcut', () => {
         const toggleBlame = sinon.stub(
             element.$.diffHost, 'loadBlame').callsFake(() => Promise.resolve());
-        MockInteractions.pressAndReleaseKeyOn(element, 66, null, 'b');
+        MockInteractions.keyUpOn(element, 66, null, 'b');
         assert.isTrue(toggleBlame.calledOnce);
       });
     });
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts
index fada9cb..7393606 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts
@@ -129,6 +129,29 @@
   rootId: string;
 }
 
+const VISIBLE_TEXT_NODE_TYPES = [Node.TEXT_NODE, Node.ELEMENT_NODE];
+
+export function getPreviousContentNodes(node?: Node | null) {
+  const sibs = [];
+  while (node) {
+    const {parentNode, previousSibling} = node;
+    const topContentLevel =
+      parentNode &&
+      (parentNode as HTMLElement).classList.contains('contentText');
+    let previousEl: Node | undefined | null;
+    if (previousSibling) {
+      previousEl = previousSibling;
+    } else if (!topContentLevel) {
+      previousEl = parentNode?.previousSibling;
+    }
+    if (previousEl && VISIBLE_TEXT_NODE_TYPES.includes(previousEl.nodeType)) {
+      sibs.push(previousEl);
+    }
+    node = previousEl;
+  }
+  return sibs;
+}
+
 export function isThreadEl(node: Node): node is GrDiffThreadElement {
   return (
     node.nodeType === Node.ELEMENT_NODE &&
diff --git a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts
index 3544834..0d6cadc 100644
--- a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts
+++ b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import '../../../styles/gr-a11y-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-dropdown-list/gr-dropdown-list';
 import '../../shared/gr-select/gr-select';
diff --git a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
index 5ab8449..26944a4 100644
--- a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-a11y-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       align-items: center;
@@ -30,11 +33,8 @@
       margin: 0 var(--spacing-m);
     }
     gr-dropdown-list {
-      --trigger-style: {
-        color: var(--deemphasized-text-color);
-        text-transform: none;
-        font-family: var(--font-family);
-      }
+      --trigger-style-text-color: var(--deemphasized-text-color);
+      --trigger-style-font-family: var(--font-family);
     }
     @media screen and (max-width: 50em) {
       .filesWeblinks {
diff --git a/polygerrit-ui/app/elements/diff/gr-range-header/gr-range-header.ts b/polygerrit-ui/app/elements/diff/gr-range-header/gr-range-header.ts
index 1c2c074..dcf7236 100644
--- a/polygerrit-ui/app/elements/diff/gr-range-header/gr-range-header.ts
+++ b/polygerrit-ui/app/elements/diff/gr-range-header/gr-range-header.ts
@@ -16,6 +16,7 @@
  */
 import {LitElement, css, html} from 'lit';
 import {customElement, property} from 'lit/decorators';
+import '@polymer/iron-icon/iron-icon';
 
 /**
  * Represents a header (label) for a code chunk whenever showing
diff --git a/polygerrit-ui/app/elements/diff/gr-ranged-comment-hint/gr-ranged-comment-hint.ts b/polygerrit-ui/app/elements/diff/gr-ranged-comment-hint/gr-ranged-comment-hint.ts
index bc3c054..3f2258d 100644
--- a/polygerrit-ui/app/elements/diff/gr-ranged-comment-hint/gr-ranged-comment-hint.ts
+++ b/polygerrit-ui/app/elements/diff/gr-ranged-comment-hint/gr-ranged-comment-hint.ts
@@ -45,6 +45,7 @@
   override render() {
     // To pass CSS mixins for @apply to Polymer components, they need to appear
     // in <style> inside the template.
+    /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
         .row {
diff --git a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
index 3b026b3..8821725 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 import '../../../styles/shared-styles';
+import '../../shared/gr-tooltip/gr-tooltip';
 import {GrTooltip} from '../../shared/gr-tooltip/gr-tooltip';
 import {customElement, property} from '@polymer/decorators';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
diff --git a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts
index 91882ab..3adb0f3 100644
--- a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts
+++ b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts
@@ -19,21 +19,15 @@
 import '../../shared/gr-list-view/gr-list-view';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-documentation-search_html';
-import {
-  ListViewMixin,
-  ListViewParams,
-} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {getBaseUrl} from '../../../utils/url-util';
 import {customElement, property} from '@polymer/decorators';
 import {DocResult} from '../../../types/common';
 import {fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
-
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
+import {ListViewParams} from '../../gr-app-types';
 
 @customElement('gr-documentation-search')
-export class GrDocumentationSearch extends base {
+export class GrDocumentationSearch extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -62,7 +56,7 @@
 
   _paramsChanged(params: ListViewParams) {
     this._loading = true;
-    this._filter = this.getFilterValue(params);
+    this._filter = params?.filter ?? '';
 
     return this._getDocumentationSearches(this._filter);
   }
@@ -87,6 +81,10 @@
     }
     return `${getBaseUrl()}/${url}`;
   }
+
+  computeLoadingClass(loading: boolean) {
+    return loading ? 'loading' : '';
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts
index 5267b2d..bf6a0d5 100644
--- a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts
+++ b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search_test.ts
@@ -21,8 +21,8 @@
 import {page} from '../../../utils/page-wrapper-utils';
 import 'lodash/lodash';
 import {stubRestApi} from '../../../test/test-utils';
-import {ListViewParams} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {DocResult} from '../../../types/common';
+import {ListViewParams} from '../../gr-app-types';
 
 const basicFixture = fixtureFromElement('gr-documentation-search');
 
diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.ts b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.ts
index 480b8fe..5312be2 100644
--- a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.ts
+++ b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 import {sharedStyles} from '../../../styles/shared-styles';
 import {LitElement, css, html} from 'lit';
 import {customElement, property} from 'lit/decorators';
@@ -62,7 +61,7 @@
   override render() {
     return html` <textarea
       id="textarea"
-      value="${this.fileContent}"
+      .value="${this.fileContent}"
       @input=${this._handleTextareaInput}
     ></textarea>`;
   }
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts
index f0a3ca1..1615a23 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts
@@ -36,7 +36,7 @@
 } from '../../shared/gr-autocomplete/gr-autocomplete';
 import {appContext} from '../../../services/app-context';
 import {IronInputElement} from '@polymer/iron-input';
-import {fireAlert} from '../../../utils/event-util';
+import {fireAlert, fireReload} from '../../../utils/event-util';
 
 export interface GrEditControls {
   $: {
@@ -237,7 +237,7 @@
           return;
         }
         this._closeDialog(this.$.openDialog);
-        GerritNav.navigateToChange(this.change);
+        fireReload(this, true);
       });
   }
 
@@ -257,7 +257,7 @@
           return;
         }
         this._closeDialog(dialog);
-        GerritNav.navigateToChange(this.change);
+        fireReload(this);
       });
   }
 
@@ -275,7 +275,7 @@
           return;
         }
         this._closeDialog(dialog);
-        GerritNav.navigateToChange(this.change);
+        fireReload(this);
       });
   }
 
@@ -293,7 +293,7 @@
           return;
         }
         this._closeDialog(dialog);
-        GerritNav.navigateToChange(this.change);
+        fireReload(this, true);
       });
   }
 
@@ -351,7 +351,7 @@
     }
   }
 
-  _handleKeyPress(event: InputEvent) {
+  _handleKeyPress(event: KeyboardEvent) {
     event.preventDefault();
     event.stopImmediatePropagation();
   }
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.ts b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.ts
index 2e1fc21..6198f17 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.ts
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.ts
@@ -76,33 +76,33 @@
       assert.isTrue(element._isValidPath('test.js'));
     });
 
-    test('open', () => {
+    test('open', async () => {
       assert.isFalse(hideDialogStub.called);
       MockInteractions.tap(queryAndAssert(element, '#open'));
       element.patchNum = 1 as PatchSetNum;
-      return showDialogSpy.lastCall.returnValue.then(() => {
-        assert.isTrue(hideDialogStub.called);
-        assert.isTrue(element.$.openDialog.disabled);
-        assert.isFalse(queryStub.called);
-        // Setup _focused manually - in headless mode Chrome sometimes don't
-        // setup focus. flush and/or flushAsynchronousOperations don't help
-        openAutoComplete._focused = true;
-        openAutoComplete.noDebounce = true;
-        openAutoComplete.text = 'src/test.cpp';
-        assert.isTrue(queryStub.called);
-        assert.isFalse(element.$.openDialog.disabled);
-        MockInteractions.tap(
-          queryAndAssert(element.$.openDialog, 'gr-button[primary]')
-        );
-        assert.isTrue(editDiffStub.called);
-        assert.isTrue(navStub.called);
-        assert.deepEqual(editDiffStub.lastCall.args, [
-          element.change,
-          'src/test.cpp',
-          element.patchNum,
-        ]);
-        assert.isTrue(closeDialogSpy.called);
-      });
+      await showDialogSpy.lastCall.returnValue;
+      assert.isTrue(hideDialogStub.called);
+      assert.isTrue(element.$.openDialog.disabled);
+      assert.isFalse(queryStub.called);
+      // Setup _focused manually - in headless mode Chrome sometimes don't
+      // setup focus. flush and/or flushAsynchronousOperations don't help
+      openAutoComplete._focused = true;
+      openAutoComplete.noDebounce = true;
+      openAutoComplete.text = 'src/test.cpp';
+      await flush();
+      assert.isTrue(queryStub.called);
+      assert.isFalse(element.$.openDialog.disabled);
+      MockInteractions.tap(
+        queryAndAssert(element.$.openDialog, 'gr-button[primary]')
+      );
+      assert.isTrue(editDiffStub.called);
+      assert.isTrue(navStub.called);
+      assert.deepEqual(editDiffStub.lastCall.args, [
+        element.change,
+        'src/test.cpp',
+        element.patchNum,
+      ]);
+      assert.isTrue(closeDialogSpy.called);
     });
 
     test('cancel', () => {
@@ -122,70 +122,67 @@
   });
 
   suite('delete button CUJ', () => {
-    let navStub: sinon.SinonStub;
+    let eventStub: sinon.SinonStub;
     let deleteStub: sinon.SinonStub;
     let deleteAutocomplete: GrAutocomplete;
 
     setup(() => {
-      navStub = sinon.stub(GerritNav, 'navigateToChange');
+      eventStub = sinon.stub(element, 'dispatchEvent');
       deleteStub = stubRestApi('deleteFileInChangeEdit');
       deleteAutocomplete =
         element.$.deleteDialog!.querySelector('gr-autocomplete')!;
     });
 
-    test('delete', () => {
+    test('delete', async () => {
       deleteStub.returns(Promise.resolve({ok: true}));
       MockInteractions.tap(queryAndAssert(element, '#delete'));
-      return showDialogSpy.lastCall.returnValue.then(() => {
-        assert.isTrue(element.$.deleteDialog.disabled);
-        assert.isFalse(queryStub.called);
-        // Setup _focused manually - in headless mode Chrome sometimes don't
-        // setup focus. flush and/or flushAsynchronousOperations don't help
-        deleteAutocomplete._focused = true;
-        deleteAutocomplete.noDebounce = true;
-        deleteAutocomplete.text = 'src/test.cpp';
-        assert.isTrue(queryStub.called);
-        assert.isFalse(element.$.deleteDialog.disabled);
-        MockInteractions.tap(
-          queryAndAssert(element.$.deleteDialog, 'gr-button[primary]')
-        );
-        flush();
+      await showDialogSpy.lastCall.returnValue;
+      assert.isTrue(element.$.deleteDialog.disabled);
+      assert.isFalse(queryStub.called);
+      // Setup _focused manually - in headless mode Chrome sometimes don't
+      // setup focus. flush and/or flushAsynchronousOperations don't help
+      deleteAutocomplete._focused = true;
+      deleteAutocomplete.noDebounce = true;
+      deleteAutocomplete.text = 'src/test.cpp';
+      await flush();
+      assert.isTrue(queryStub.called);
+      assert.isFalse(element.$.deleteDialog.disabled);
+      MockInteractions.tap(
+        queryAndAssert(element.$.deleteDialog, 'gr-button[primary]')
+      );
+      await flush();
 
-        assert.isTrue(deleteStub.called);
-
-        return deleteStub.lastCall.returnValue.then(() => {
-          assert.equal(element._path, '');
-          assert.isTrue(navStub.called);
-          assert.isTrue(closeDialogSpy.called);
-        });
-      });
+      assert.isTrue(deleteStub.called);
+      await deleteStub.lastCall.returnValue;
+      assert.equal(element._path, '');
+      assert.equal(eventStub.firstCall.args[0].type, 'reload');
+      assert.isTrue(closeDialogSpy.called);
     });
 
-    test('delete fails', () => {
+    test('delete fails', async () => {
       deleteStub.returns(Promise.resolve({ok: false}));
       MockInteractions.tap(queryAndAssert(element, '#delete'));
-      return showDialogSpy.lastCall.returnValue.then(() => {
-        assert.isTrue(element.$.deleteDialog.disabled);
-        assert.isFalse(queryStub.called);
-        // Setup _focused manually - in headless mode Chrome sometimes don't
-        // setup focus. flush and/or flushAsynchronousOperations don't help
-        deleteAutocomplete._focused = true;
-        deleteAutocomplete.noDebounce = true;
-        deleteAutocomplete.text = 'src/test.cpp';
-        assert.isTrue(queryStub.called);
-        assert.isFalse(element.$.deleteDialog.disabled);
-        MockInteractions.tap(
-          queryAndAssert(element.$.deleteDialog, 'gr-button[primary]')
-        );
-        flush();
+      await showDialogSpy.lastCall.returnValue;
+      assert.isTrue(element.$.deleteDialog.disabled);
+      assert.isFalse(queryStub.called);
+      // Setup _focused manually - in headless mode Chrome sometimes don't
+      // setup focus. flush and/or flushAsynchronousOperations don't help
+      deleteAutocomplete._focused = true;
+      deleteAutocomplete.noDebounce = true;
+      deleteAutocomplete.text = 'src/test.cpp';
+      await flush();
+      assert.isTrue(queryStub.called);
+      assert.isFalse(element.$.deleteDialog.disabled);
+      MockInteractions.tap(
+        queryAndAssert(element.$.deleteDialog, 'gr-button[primary]')
+      );
+      await flush();
 
-        assert.isTrue(deleteStub.called);
+      assert.isTrue(deleteStub.called);
 
-        return deleteStub.lastCall.returnValue.then(() => {
-          assert.isFalse(navStub.called);
-          assert.isFalse(closeDialogSpy.called);
-        });
-      });
+      await deleteStub.lastCall.returnValue;
+      assert.isFalse(eventStub.called);
+      assert.isFalse(closeDialogSpy.called);
     });
 
     test('cancel', () => {
@@ -198,7 +195,7 @@
         MockInteractions.tap(
           queryAndAssert(element.$.deleteDialog, 'gr-button')
         );
-        assert.isFalse(navStub.called);
+        assert.isFalse(eventStub.called);
         assert.isTrue(closeDialogSpy.called);
         assert.equal(element._path, '');
       });
@@ -206,78 +203,77 @@
   });
 
   suite('rename button CUJ', () => {
-    let navStub: sinon.SinonStub;
+    let eventStub: sinon.SinonStub;
     let renameStub: sinon.SinonStub;
     let renameAutocomplete: GrAutocomplete;
 
     setup(() => {
-      navStub = sinon.stub(GerritNav, 'navigateToChange');
+      eventStub = sinon.stub(element, 'dispatchEvent');
       renameStub = stubRestApi('renameFileInChangeEdit');
       renameAutocomplete =
         element.$.renameDialog!.querySelector('gr-autocomplete')!;
     });
 
-    test('rename', () => {
+    test('rename', async () => {
       renameStub.returns(Promise.resolve({ok: true}));
       MockInteractions.tap(queryAndAssert(element, '#rename'));
-      return showDialogSpy.lastCall.returnValue.then(() => {
-        assert.isTrue(element.$.renameDialog.disabled);
-        assert.isFalse(queryStub.called);
-        // Setup _focused manually - in headless mode Chrome sometimes don't
-        // setup focus. flush and/or flushAsynchronousOperations don't help
-        renameAutocomplete._focused = true;
-        renameAutocomplete.noDebounce = true;
-        renameAutocomplete.text = 'src/test.cpp';
-        assert.isTrue(queryStub.called);
-        assert.isTrue(element.$.renameDialog.disabled);
+      await showDialogSpy.lastCall.returnValue;
+      assert.isTrue(element.$.renameDialog.disabled);
+      assert.isFalse(queryStub.called);
+      // Setup _focused manually - in headless mode Chrome sometimes don't
+      // setup focus. flush and/or flushAsynchronousOperations don't help
+      renameAutocomplete._focused = true;
+      renameAutocomplete.noDebounce = true;
+      renameAutocomplete.text = 'src/test.cpp';
+      await flush();
+      assert.isTrue(queryStub.called);
+      assert.isTrue(element.$.renameDialog.disabled);
 
-        element.$.newPathIronInput.bindValue = 'src/test.newPath';
+      element.$.newPathIronInput.bindValue = 'src/test.newPath';
+      await flush();
 
-        assert.isFalse(element.$.renameDialog.disabled);
-        MockInteractions.tap(
-          queryAndAssert(element.$.renameDialog, 'gr-button[primary]')
-        );
-        flush();
+      assert.isFalse(element.$.renameDialog.disabled);
+      MockInteractions.tap(
+        queryAndAssert(element.$.renameDialog, 'gr-button[primary]')
+      );
+      await flush();
+      assert.isTrue(renameStub.called);
 
-        assert.isTrue(renameStub.called);
-
-        return renameStub.lastCall.returnValue.then(() => {
-          assert.equal(element._path, '');
-          assert.isTrue(navStub.called);
-          assert.isTrue(closeDialogSpy.called);
-        });
-      });
+      await renameStub.lastCall.returnValue;
+      assert.equal(element._path, '');
+      assert.equal(eventStub.firstCall.args[0].type, 'reload');
+      assert.isTrue(closeDialogSpy.called);
     });
 
-    test('rename fails', () => {
+    test('rename fails', async () => {
       renameStub.returns(Promise.resolve({ok: false}));
       MockInteractions.tap(queryAndAssert(element, '#rename'));
-      return showDialogSpy.lastCall.returnValue.then(() => {
-        assert.isTrue(element.$.renameDialog.disabled);
-        assert.isFalse(queryStub.called);
-        // Setup _focused manually - in headless mode Chrome sometimes don't
-        // setup focus. flush and/or flushAsynchronousOperations don't help
-        renameAutocomplete._focused = true;
-        renameAutocomplete.noDebounce = true;
-        renameAutocomplete.text = 'src/test.cpp';
-        assert.isTrue(queryStub.called);
-        assert.isTrue(element.$.renameDialog.disabled);
+      await showDialogSpy.lastCall.returnValue;
+      assert.isTrue(element.$.renameDialog.disabled);
+      assert.isFalse(queryStub.called);
+      // Setup _focused manually - in headless mode Chrome sometimes don't
+      // setup focus. flush and/or flushAsynchronousOperations don't help
+      renameAutocomplete._focused = true;
+      renameAutocomplete.noDebounce = true;
+      renameAutocomplete.text = 'src/test.cpp';
+      await flush();
+      assert.isTrue(queryStub.called);
+      assert.isTrue(element.$.renameDialog.disabled);
 
-        element.$.newPathIronInput.bindValue = 'src/test.newPath';
+      element.$.newPathIronInput.bindValue = 'src/test.newPath';
+      await flush();
 
-        assert.isFalse(element.$.renameDialog.disabled);
-        MockInteractions.tap(
-          queryAndAssert(element.$.renameDialog, 'gr-button[primary]')
-        );
-        flush();
+      assert.isFalse(element.$.renameDialog.disabled);
+      MockInteractions.tap(
+        queryAndAssert(element.$.renameDialog, 'gr-button[primary]')
+      );
+      await flush();
 
-        assert.isTrue(renameStub.called);
+      assert.isTrue(renameStub.called);
 
-        return renameStub.lastCall.returnValue.then(() => {
-          assert.isFalse(navStub.called);
-          assert.isFalse(closeDialogSpy.called);
-        });
-      });
+      await renameStub.lastCall.returnValue;
+      assert.isFalse(eventStub.called);
+      assert.isFalse(closeDialogSpy.called);
     });
 
     test('cancel', () => {
@@ -291,7 +287,7 @@
         MockInteractions.tap(
           queryAndAssert(element.$.renameDialog, 'gr-button')
         );
-        assert.isFalse(navStub.called);
+        assert.isFalse(eventStub.called);
         assert.isTrue(closeDialogSpy.called);
         assert.equal(element._path, '');
         assert.equal(element._newPath, '');
@@ -300,11 +296,11 @@
   });
 
   suite('restore button CUJ', () => {
-    let navStub: sinon.SinonStub;
+    let eventStub: sinon.SinonStub;
     let restoreStub: sinon.SinonStub;
 
     setup(() => {
-      navStub = sinon.stub(GerritNav, 'navigateToChange');
+      eventStub = sinon.stub(element, 'dispatchEvent');
       restoreStub = stubRestApi('restoreFileInChangeEdit');
     });
 
@@ -328,7 +324,7 @@
         assert.equal(restoreStub.lastCall.args[1], 'src/test.cpp');
         return restoreStub.lastCall.returnValue.then(() => {
           assert.equal(element._path, '');
-          assert.isTrue(navStub.called);
+          assert.equal(eventStub.firstCall.args[0].type, 'reload');
           assert.isTrue(closeDialogSpy.called);
         });
       });
@@ -347,7 +343,7 @@
         assert.isTrue(restoreStub.called);
         assert.equal(restoreStub.lastCall.args[1], 'src/test.cpp');
         return restoreStub.lastCall.returnValue.then(() => {
-          assert.isFalse(navStub.called);
+          assert.isFalse(eventStub.called);
           assert.isFalse(closeDialogSpy.called);
         });
       });
@@ -360,7 +356,7 @@
         MockInteractions.tap(
           queryAndAssert(element.$.restoreDialog, 'gr-button')
         );
-        assert.isFalse(navStub.called);
+        assert.isFalse(eventStub.called);
         assert.isTrue(closeDialogSpy.called);
         assert.equal(element._path, '');
       });
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts
index 1255256..418c368 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts
@@ -49,6 +49,9 @@
           display: flex;
           justify-content: flex-end;
         }
+        gr-dropdown {
+          --gr-button-padding: var(--spacing-xs) var(--spacing-s);
+        }
         #actions {
           margin-right: var(--spacing-l);
         }
@@ -59,14 +62,9 @@
   override render() {
     // To pass CSS mixins for @apply to Polymer components, they need to appear
     // in <style> inside the template.
+    /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
-        gr-button,
-        gr-dropdown {
-          --gr-button: {
-            height: 1.8em;
-          }
-        }
         gr-dropdown {
           --gr-dropdown-item: {
             background-color: transparent;
diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.ts b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.ts
index 6f2d27e..ad7e015 100644
--- a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.ts
+++ b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.ts
@@ -47,6 +47,7 @@
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {GrDefaultEditor} from '../gr-default-editor/gr-default-editor';
 import {GrEndpointDecorator} from '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
+import {IronKeyboardEvent} from '../../../types/events';
 
 const RESTORED_MESSAGE = 'Content restored from a previous edit.';
 const SAVING_MESSAGE = 'Saving changes...';
@@ -393,7 +394,7 @@
     );
   }
 
-  _handleSaveShortcut(e: KeyboardEvent) {
+  _handleSaveShortcut(e: IronKeyboardEvent) {
     e.preventDefault();
     if (!this._saveDisabled) {
       this._saveEdit();
diff --git a/polygerrit-ui/app/elements/gr-app-element.ts b/polygerrit-ui/app/elements/gr-app-element.ts
index 46a3e84..38f55bd 100644
--- a/polygerrit-ui/app/elements/gr-app-element.ts
+++ b/polygerrit-ui/app/elements/gr-app-element.ts
@@ -43,7 +43,6 @@
 import {
   KeyboardShortcutMixin,
   Shortcut,
-  SPECIAL_SHORTCUT,
 } from '../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {GerritNav} from './core/gr-navigation/gr-navigation';
 import {appContext} from '../services/app-context';
@@ -69,7 +68,7 @@
 import {GrMainHeader} from './core/gr-main-header/gr-main-header';
 import {GrSettingsView} from './settings/gr-settings-view/gr-settings-view';
 import {
-  CustomKeyboardEvent,
+  IronKeyboardEvent,
   DialogChangeEventDetail,
   EventType,
   LocationChangeEvent,
@@ -215,6 +214,8 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   override keyboardShortcuts() {
     return {
       [Shortcut.OPEN_SHORTCUT_HELP_DIALOG]: '_showKeyboardShortcuts',
@@ -232,7 +233,6 @@
     // model changes and updates the config model, but at the moment the service
     // is not called from anywhere.
     appContext.configService;
-    this._bindKeyboardShortcuts();
     document.addEventListener(EventType.PAGE_ERROR, e => {
       this._handlePageError(e);
     });
@@ -242,7 +242,7 @@
     this.addEventListener(EventType.DIALOG_CHANGE, e => {
       this._handleDialogChange(e as CustomEvent<DialogChangeEventDetail>);
     });
-    this.addEventListener('location-change', e =>
+    this.addEventListener(EventType.LOCATION_CHANGE, e =>
       this._handleLocationChange(e)
     );
     this.addEventListener(EventType.RECREATE_CHANGE_VIEW, () =>
@@ -251,7 +251,7 @@
     this.addEventListener(EventType.RECREATE_DIFF_VIEW, () =>
       this.handleRecreateView(GerritView.DIFF)
     );
-    document.addEventListener('gr-rpc-log', e => this._handleRpcLog(e));
+    document.addEventListener(EventType.GR_RPC_LOG, e => this._handleRpcLog(e));
   }
 
   override ready() {
@@ -307,158 +307,6 @@
     };
   }
 
-  _bindKeyboardShortcuts() {
-    this.bindShortcut(
-      Shortcut.SEND_REPLY,
-      SPECIAL_SHORTCUT.DOC_ONLY,
-      'ctrl+enter',
-      'meta+enter'
-    );
-    this.bindShortcut(Shortcut.EMOJI_DROPDOWN, SPECIAL_SHORTCUT.DOC_ONLY, ':');
-
-    this.bindShortcut(Shortcut.OPEN_SHORTCUT_HELP_DIALOG, '?');
-    this.bindShortcut(
-      Shortcut.GO_TO_USER_DASHBOARD,
-      SPECIAL_SHORTCUT.GO_KEY,
-      'i'
-    );
-    this.bindShortcut(
-      Shortcut.GO_TO_OPENED_CHANGES,
-      SPECIAL_SHORTCUT.GO_KEY,
-      'o'
-    );
-    this.bindShortcut(
-      Shortcut.GO_TO_MERGED_CHANGES,
-      SPECIAL_SHORTCUT.GO_KEY,
-      'm'
-    );
-    this.bindShortcut(
-      Shortcut.GO_TO_ABANDONED_CHANGES,
-      SPECIAL_SHORTCUT.GO_KEY,
-      'a'
-    );
-    this.bindShortcut(
-      Shortcut.GO_TO_WATCHED_CHANGES,
-      SPECIAL_SHORTCUT.GO_KEY,
-      'w'
-    );
-
-    this.bindShortcut(Shortcut.CURSOR_NEXT_CHANGE, 'j');
-    this.bindShortcut(Shortcut.CURSOR_PREV_CHANGE, 'k');
-    this.bindShortcut(Shortcut.OPEN_CHANGE, 'o');
-    this.bindShortcut(Shortcut.NEXT_PAGE, 'n', ']');
-    this.bindShortcut(Shortcut.PREV_PAGE, 'p', '[');
-    this.bindShortcut(Shortcut.TOGGLE_CHANGE_REVIEWED, 'r:keyup');
-    this.bindShortcut(Shortcut.TOGGLE_CHANGE_STAR, 's:keydown');
-    this.bindShortcut(Shortcut.REFRESH_CHANGE_LIST, 'shift+r:keyup');
-    this.bindShortcut(Shortcut.EDIT_TOPIC, 't');
-    this.bindShortcut(Shortcut.OPEN_SUBMIT_DIALOG, 'shift+s');
-
-    this.bindShortcut(Shortcut.OPEN_REPLY_DIALOG, 'a:keyup');
-    this.bindShortcut(Shortcut.OPEN_DOWNLOAD_DIALOG, 'd:keyup');
-    this.bindShortcut(Shortcut.EXPAND_ALL_MESSAGES, 'x');
-    this.bindShortcut(Shortcut.COLLAPSE_ALL_MESSAGES, 'z');
-    this.bindShortcut(Shortcut.REFRESH_CHANGE, 'shift+r:keyup');
-    this.bindShortcut(Shortcut.UP_TO_DASHBOARD, 'u');
-    this.bindShortcut(Shortcut.UP_TO_CHANGE, 'u');
-    this.bindShortcut(Shortcut.TOGGLE_DIFF_MODE, 'm:keyup');
-    this.bindShortcut(
-      Shortcut.DIFF_AGAINST_BASE,
-      SPECIAL_SHORTCUT.V_KEY,
-      'down',
-      's'
-    );
-    // this keyboard shortcut is used in toast _displayDiffAgainstLatestToast
-    // in gr-diff-view. Any updates here should be reflected there
-    this.bindShortcut(
-      Shortcut.DIFF_AGAINST_LATEST,
-      SPECIAL_SHORTCUT.V_KEY,
-      'up',
-      'w'
-    );
-    // this keyboard shortcut is used in toast _displayDiffBaseAgainstLeftToast
-    // in gr-diff-view. Any updates here should be reflected there
-    this.bindShortcut(
-      Shortcut.DIFF_BASE_AGAINST_LEFT,
-      SPECIAL_SHORTCUT.V_KEY,
-      'left',
-      'a'
-    );
-    this.bindShortcut(
-      Shortcut.DIFF_RIGHT_AGAINST_LATEST,
-      SPECIAL_SHORTCUT.V_KEY,
-      'right',
-      'd'
-    );
-    this.bindShortcut(
-      Shortcut.DIFF_BASE_AGAINST_LATEST,
-      SPECIAL_SHORTCUT.V_KEY,
-      'b'
-    );
-
-    this.bindShortcut(Shortcut.NEXT_LINE, 'j', 'down');
-    this.bindShortcut(Shortcut.PREV_LINE, 'k', 'up');
-    if (this._isCursorManagerSupportMoveToVisibleLine()) {
-      this.bindShortcut(Shortcut.VISIBLE_LINE, '.');
-    }
-    this.bindShortcut(Shortcut.NEXT_CHUNK, 'n');
-    this.bindShortcut(Shortcut.PREV_CHUNK, 'p');
-    this.bindShortcut(Shortcut.TOGGLE_ALL_DIFF_CONTEXT, 'shift+x');
-    this.bindShortcut(Shortcut.NEXT_COMMENT_THREAD, 'shift+n');
-    this.bindShortcut(Shortcut.PREV_COMMENT_THREAD, 'shift+p');
-    this.bindShortcut(
-      Shortcut.EXPAND_ALL_COMMENT_THREADS,
-      SPECIAL_SHORTCUT.DOC_ONLY,
-      'e'
-    );
-    this.bindShortcut(
-      Shortcut.COLLAPSE_ALL_COMMENT_THREADS,
-      SPECIAL_SHORTCUT.DOC_ONLY,
-      'shift+e'
-    );
-    this.bindShortcut(Shortcut.LEFT_PANE, 'shift+left');
-    this.bindShortcut(Shortcut.RIGHT_PANE, 'shift+right');
-    this.bindShortcut(Shortcut.TOGGLE_LEFT_PANE, 'shift+a');
-    this.bindShortcut(Shortcut.NEW_COMMENT, 'c');
-    this.bindShortcut(
-      Shortcut.SAVE_COMMENT,
-      'ctrl+enter',
-      'meta+enter',
-      'ctrl+s',
-      'meta+s'
-    );
-    this.bindShortcut(Shortcut.OPEN_DIFF_PREFS, ',');
-    this.bindShortcut(Shortcut.TOGGLE_DIFF_REVIEWED, 'r:keyup');
-
-    this.bindShortcut(Shortcut.NEXT_FILE, ']');
-    this.bindShortcut(Shortcut.PREV_FILE, '[');
-    this.bindShortcut(Shortcut.NEXT_FILE_WITH_COMMENTS, 'shift+j');
-    this.bindShortcut(Shortcut.PREV_FILE_WITH_COMMENTS, 'shift+k');
-    this.bindShortcut(Shortcut.CURSOR_NEXT_FILE, 'j', 'down');
-    this.bindShortcut(Shortcut.CURSOR_PREV_FILE, 'k', 'up');
-    this.bindShortcut(Shortcut.OPEN_FILE, 'o', 'enter');
-    this.bindShortcut(Shortcut.TOGGLE_FILE_REVIEWED, 'r:keyup');
-    this.bindShortcut(Shortcut.NEXT_UNREVIEWED_FILE, 'shift+m');
-    this.bindShortcut(Shortcut.TOGGLE_ALL_INLINE_DIFFS, 'shift+i');
-    this.bindShortcut(Shortcut.TOGGLE_INLINE_DIFF, 'i');
-    this.bindShortcut(Shortcut.TOGGLE_BLAME, 'b:keyup');
-    this.bindShortcut(Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS, 'h');
-    this.bindShortcut(Shortcut.OPEN_FILE_LIST, 'f');
-
-    this.bindShortcut(Shortcut.OPEN_FIRST_FILE, ']');
-    this.bindShortcut(Shortcut.OPEN_LAST_FILE, '[');
-
-    this.bindShortcut(Shortcut.SEARCH, '/');
-  }
-
-  _isCursorManagerSupportMoveToVisibleLine() {
-    // This method is a copy-paste from the
-    // method _isIntersectionObserverSupported of gr-cursor-manager.js
-    // It is better share this method with gr-cursor-manager,
-    // but doing it require a lot if changes instead of 1-line copied code
-    return 'IntersectionObserver' in window;
-  }
-
   _accountChanged(account?: AccountDetailInfo) {
     if (!account) return;
 
@@ -654,7 +502,8 @@
     (this.shadowRoot!.querySelector('#keyboardShortcuts') as GrOverlay).open();
   }
 
-  _showKeyboardShortcuts(e: CustomKeyboardEvent) {
+  _showKeyboardShortcuts(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) return;
     // same shortcut should close the dialog if pressed again
     // when dialog is open
     this.loadKeyboardShortcutsDialog = true;
@@ -667,9 +516,6 @@
       keyboardShortcuts.cancel();
       return;
     }
-    if (this.shouldSuppressKeyboardShortcut(e)) {
-      return;
-    }
     keyboardShortcuts.open();
     this._footerHeaderAriaHidden = true;
     this._mainAriaHidden = true;
diff --git a/polygerrit-ui/app/elements/gr-app-types.ts b/polygerrit-ui/app/elements/gr-app-types.ts
index e5096c0..6c8bdb9 100644
--- a/polygerrit-ui/app/elements/gr-app-types.ts
+++ b/polygerrit-ui/app/elements/gr-app-types.ts
@@ -52,20 +52,21 @@
   groupId: GroupId;
 }
 
-export interface AppElementAdminParams {
+export interface ListViewParams {
+  filter?: string | null;
+  offset?: number | string;
+}
+
+export interface AppElementAdminParams extends ListViewParams {
   view: GerritView.ADMIN;
   adminView: string;
-  offset?: string | number;
-  filter?: string | null;
   openCreateModal?: boolean;
 }
 
-export interface AppElementRepoParams {
+export interface AppElementRepoParams extends ListViewParams {
   view: GerritView.REPO;
   detail?: RepoDetailView;
   repo: RepoName;
-  offset?: string | number;
-  filter?: string | null;
 }
 
 export interface AppElementDocSearchParams {
diff --git a/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.ts b/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.ts
index 988366c..7fee4a0 100644
--- a/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.ts
@@ -37,7 +37,7 @@
     getPluginLoader().loadPlugins(pluginsPending);
   }
 
-  updated(changedProperties: PropertyValues<GrPluginHost>) {
+  override updated(changedProperties: PropertyValues<GrPluginHost>) {
     if (changedProperties.has('config') && this.config) {
       this._configChanged(this.config);
     }
diff --git a/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-popup-interface.ts b/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-popup-interface.ts
index 8ed6611..45a93bf 100644
--- a/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-popup-interface.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-popup-interface.ts
@@ -51,6 +51,11 @@
     return dom(this.popup) as unknown as HTMLElement;
   }
 
+  appendContent(el: HTMLElement) {
+    if (!this.popup) throw new Error('popup element not (yet) available');
+    this.popup.appendChild(el);
+  }
+
   /**
    * Opens the popup, inserts it into DOM over current UI.
    * Creates the popup if not previously created. Creates popup content element,
diff --git a/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-custom-plugin-header.ts b/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-custom-plugin-header.ts
index f913cf6..6580ad6 100644
--- a/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-custom-plugin-header.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-custom-plugin-header.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+/* eslint-disable lit/no-legacy-template-syntax,lit/prefer-static-styles */
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 import {customElement, property} from '@polymer/decorators';
diff --git a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts
index 536beb4..bd6835c 100644
--- a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts
+++ b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts
@@ -26,7 +26,6 @@
 import {EditableAccountField} from '../../../constants/constants';
 import {appContext} from '../../../services/app-context';
 import {fireEvent} from '../../../utils/event-util';
-import {KeydownEvent} from '../../../types/events';
 
 @customElement('gr-account-info')
 export class GrAccountInfo extends PolymerElement {
@@ -247,7 +246,7 @@
     this._hasNameChange = true;
   }
 
-  _handleKeydown(e: KeydownEvent) {
+  _handleKeydown(e: KeyboardEvent) {
     if (e.keyCode === 13) {
       // Enter
       e.stopPropagation();
diff --git a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
index 514f00e..51259c8 100644
--- a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
+++ b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
@@ -56,7 +56,7 @@
       <span class="title">Registered</span>
       <span class="value">
         <gr-date-formatter
-          has-tooltip=""
+          withTooltip
           date-str="[[_account.registered_on]]"
         ></gr-date-formatter>
       </span>
diff --git a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts
index eca38d9..a972db3 100644
--- a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts
+++ b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts
@@ -41,7 +41,7 @@
     });
   }
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
@@ -71,7 +71,7 @@
     `;
   }
 
-  render() {
+  override render() {
     return html` <div class="gr-form-styles">
       <table id="agreements">
         <thead>
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts
index b79e448..96b1ded 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts
@@ -15,22 +15,18 @@
  * limitations under the License.
  */
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../../styles/shared-styles';
 import '../../../styles/gr-form-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-change-table-editor_html';
-import {ChangeTableMixin} from '../../../mixins/gr-change-table-mixin/gr-change-table-mixin';
 import {customElement, property, observe} from '@polymer/decorators';
 import {ServerInfo} from '../../../types/common';
 import {appContext} from '../../../services/app-context';
-
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ChangeTableMixin(PolymerElement);
+import {columnNames} from '../../change-list/gr-change-list/gr-change-list';
 
 @customElement('gr-change-table-editor')
-export class GrChangeTableEditor extends base {
+export class GrChangeTableEditor extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -51,18 +47,33 @@
 
   @observe('serverConfig')
   _configChanged(config: ServerInfo) {
-    this.defaultColumns = this.getEnabledColumns(
-      this.columnNames,
-      config,
-      this.flagsService.enabledExperiments
+    this.defaultColumns = columnNames.filter(col =>
+      this._isColumnEnabled(col, config, this.flagsService.enabledExperiments)
     );
     if (!this.displayedColumns) return;
     this.displayedColumns = this.displayedColumns.filter(column =>
-      this.isColumnEnabled(column, config, this.flagsService.enabledExperiments)
+      this._isColumnEnabled(
+        column,
+        config,
+        this.flagsService.enabledExperiments
+      )
     );
   }
 
   /**
+   * Is the column disabled by a server config or experiment? For example the
+   * assignee feature might be disabled and thus the corresponding column is
+   * also disabled.
+   *
+   */
+  _isColumnEnabled(column: string, config: ServerInfo, experiments: string[]) {
+    if (!config || !config.change) return true;
+    if (column === 'Assignee') return !!config.change.enable_assignee;
+    if (column === 'Comments') return experiments.includes('comments-column');
+    return true;
+  }
+
+  /**
    * Get the list of enabled column names from whichever checkboxes are
    * checked (excluding the number checkbox).
    */
@@ -79,6 +90,13 @@
       .map(checkbox => checkbox.name);
   }
 
+  _computeIsColumnHidden(columnToCheck?: string, columnsToDisplay?: string[]) {
+    if (!columnsToDisplay || !columnToCheck) {
+      return false;
+    }
+    return !columnsToDisplay.includes(columnToCheck);
+  }
+
   /**
    * Handle a click on a checkbox container and relay the click to the checkbox it
    * contains.
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
index a05ec73..e756a20 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
@@ -74,7 +74,7 @@
                 type="checkbox"
                 name="[[item]]"
                 on-click="_handleTargetClick"
-                checked$="[[!isColumnHidden(item, displayedColumns)]]"
+                checked$="[[!_computeIsColumnHidden(item, displayedColumns)]]"
               />
             </td>
           </tr>
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.ts b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.ts
index 4f61972..4f8d0a0 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.ts
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.ts
@@ -117,7 +117,7 @@
 
   test('_getDisplayedColumns', () => {
     const enabledColumns = columns.filter(column =>
-      element.isColumnEnabled(column, element.serverConfig!, [])
+      element._isColumnEnabled(column, element.serverConfig!, [])
     );
     assert.deepEqual(element._getDisplayedColumns(), enabledColumns);
     const input = queryAndAssert<HTMLInputElement>(
diff --git a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts
index 6354c9a..59f6a39 100644
--- a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts
+++ b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts
@@ -75,7 +75,7 @@
     return Promise.all(promises);
   }
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       formStyles,
@@ -113,9 +113,9 @@
     ];
   }
 
-  render() {
+  override render() {
     return html` <div class="gr-form-styles">
-        <div ?hidden=${this._passwordUrl}>
+        <div ?hidden=${!!this._passwordUrl}>
           <section>
             <span class="title">Username</span>
             <span class="value">${this._username ?? ''}</span>
@@ -125,7 +125,7 @@
           >
         </div>
         <span ?hidden=${!this._passwordUrl}>
-          <a href="${this._passwordUrl}" target="_blank" rel="noopener">
+          <a href="${this._passwordUrl!}" target="_blank" rel="noopener">
             Obtain password</a
           >
           (opens in a new tab)
@@ -134,7 +134,7 @@
       <gr-overlay
         id="generatedPasswordOverlay"
         @iron-overlay-closed=${this._generatedPasswordOverlayClosed}
-        with-backdrop=""
+        with-backdrop
       >
         <div class="gr-form-styles">
           <section id="generatedPasswordDisplay">
diff --git a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts
index ace1e1a..c392a13 100644
--- a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts
@@ -16,7 +16,6 @@
  */
 import '@polymer/iron-input/iron-input';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../../styles/shared-styles';
 import '../../../styles/gr-form-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
@@ -24,7 +23,6 @@
 import {htmlTemplate} from './gr-menu-editor_html';
 import {customElement, property} from '@polymer/decorators';
 import {TopMenuItemInfo} from '../../../types/common';
-import {KeydownEvent} from '../../../types/events';
 
 @customElement('gr-menu-editor')
 export class GrMenuEditor extends PolymerElement {
@@ -91,7 +89,7 @@
     return !newName?.length || !newUrl?.length;
   }
 
-  _handleInputKeydown(e: KeydownEvent) {
+  _handleInputKeydown(e: KeyboardEvent) {
     if (e.keyCode === 13) {
       e.stopPropagation();
       this._handleAddButton();
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.ts b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.ts
index da4bb0a..3533fd6 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.ts
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.ts
@@ -29,7 +29,6 @@
 import '../gr-change-table-editor/gr-change-table-editor';
 import '../../shared/gr-button/gr-button';
 import {GrButton} from '../../shared/gr-button/gr-button';
-import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../shared/gr-diff-preferences/gr-diff-preferences';
 import '../../shared/gr-page-nav/gr-page-nav';
 import '../../shared/gr-select/gr-select';
@@ -47,7 +46,6 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-settings-view_html';
 import {getDocsBaseUrl} from '../../../utils/url-util';
-import {ChangeTableMixin} from '../../../mixins/gr-change-table-mixin/gr-change-table-mixin';
 import {customElement, property, observe} from '@polymer/decorators';
 import {AppElementParams} from '../../gr-app-types';
 import {GrAccountInfo} from '../gr-account-info/gr-account-info';
@@ -64,7 +62,6 @@
 import {GrSshEditor} from '../gr-ssh-editor/gr-ssh-editor';
 import {GrGpgEditor} from '../gr-gpg-editor/gr-gpg-editor';
 import {GrEmailEditor} from '../gr-email-editor/gr-email-editor';
-import {KeydownEvent} from '../../../types/events';
 import {fireAlert, fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
 import {GerritView} from '../../../services/router/router-model';
@@ -76,6 +73,7 @@
   EmailStrategy,
   TimeFormat,
 } from '../../../constants/constants';
+import {columnNames} from '../../change-list/gr-change-list/gr-change-list';
 
 const PREFS_SECTION_FIELDS: Array<keyof PreferencesInput> = [
   'changes_per_page',
@@ -139,11 +137,8 @@
   };
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ChangeTableMixin(PolymerElement);
-
 @customElement('gr-settings-view')
-export class GrSettingsView extends base {
+export class GrSettingsView extends PolymerElement {
   static get template() {
     return htmlTemplate;
   }
@@ -262,8 +257,10 @@
         this._localMenu = this._cloneMenu(prefs.my);
         this._localChangeTableColumns =
           prefs.change_table.length === 0
-            ? this.columnNames
-            : this.renameProjectToRepoColumn(prefs.change_table);
+            ? columnNames
+            : prefs.change_table.map(column =>
+                column === 'Project' ? 'Repo' : column
+              );
       })
     );
 
@@ -491,7 +488,7 @@
     this.$.emailEditor.save();
   }
 
-  _handleNewEmailKeydown(e: KeydownEvent) {
+  _handleNewEmailKeydown(e: KeyboardEvent) {
     if (e.keyCode === 13) {
       // Enter
       e.stopPropagation();
diff --git a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts
index 66103fd..31c62b1 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts
@@ -128,6 +128,7 @@
   override render() {
     // To pass CSS mixins for @apply to Polymer components, they need to appear
     // in <style> inside the template.
+    /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
         .container {
diff --git a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts
index f746c29..dabf761 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts
@@ -199,25 +199,14 @@
         ${!this.hideHovercard
           ? html`<gr-hovercard-account
               for="hovercardTarget"
-              .account="${account}"
-              .change="${change}"
-              ?highlight-attention=${highlightAttention}
+              .account=${account}
+              .change=${change}
+              .highlightAttention=${highlightAttention}
               .voteableText=${this.voteableText}
             ></gr-hovercard-account>`
           : ''}
         ${hasAttention
-          ? html`<gr-button
-              id="attentionButton"
-              link=""
-              aria-label="Remove user from attention set"
-              @click=${this._handleRemoveAttentionClick}
-              ?disabled=${!this._computeAttentionButtonEnabled(
-                highlightAttention,
-                account,
-                change,
-                this.selected,
-                this._selfAccount
-              )}
+          ? html` <gr-tooltip-content
               ?has-tooltip=${this._computeAttentionButtonEnabled(
                 highlightAttention,
                 account,
@@ -233,11 +222,25 @@
                 this.selected,
                 this._selfAccount
               )}"
-              ><iron-icon
-                class="attention"
-                icon="gr-icons:attention"
-              ></iron-icon>
-            </gr-button>`
+            >
+              <gr-button
+                id="attentionButton"
+                link=""
+                aria-label="Remove user from attention set"
+                @click=${this._handleRemoveAttentionClick}
+                ?disabled=${!this._computeAttentionButtonEnabled(
+                  highlightAttention,
+                  account,
+                  change,
+                  this.selected,
+                  this._selfAccount
+                )}
+                ><iron-icon
+                  class="attention"
+                  icon="gr-icons:attention"
+                ></iron-icon>
+              </gr-button>
+            </gr-tooltip-content>`
           : ''}
       </span>
       <span
diff --git a/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.ts b/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.ts
index b302bee..f0c9106 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.ts
@@ -20,6 +20,7 @@
 import {AccountInfo, ChangeInfo} from '../../../types/common';
 import {LitElement, css, html} from 'lit';
 import {customElement, property} from 'lit/decorators';
+import {ParsedChangeInfo} from '../../../types/types';
 
 @customElement('gr-account-link')
 export class GrAccountLink extends LitElement {
@@ -35,7 +36,7 @@
    * related features like adding the user as a reviewer.
    */
   @property({type: Object})
-  change?: ChangeInfo;
+  change?: ChangeInfo | ParsedChangeInfo;
 
   /**
    * Should this user be considered to be in the attention set, regardless
@@ -95,7 +96,7 @@
           ?hideStatus=${this.hideStatus}
           ?firstName=${this.firstName}
           .voteableText=${this.voteableText}
-          part="gr-account-link-text => gr-account-label-text"
+          exportparts="gr-account-label-text: gr-account-link-text"
         >
         </gr-account-label>
       </a>
diff --git a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts
index c5d1f03..d97e38e 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts
@@ -39,7 +39,6 @@
 import {PaperInputElementExt} from '../../../types/types';
 import {fireAlert} from '../../../utils/event-util';
 import {accountOrGroupKey} from '../../../utils/account-util';
-import {KeydownEvent} from '../../../types/events';
 
 const VALID_EMAIL_ALERT = 'Please input a valid email.';
 
@@ -360,7 +359,7 @@
     }
   }
 
-  _handleChipKeydown(e: KeydownEvent) {
+  _handleChipKeydown(e: KeyboardEvent) {
     const chip = e.target as GrAccountChip;
     const chips = this.accountChips;
     const index = chips.indexOf(chip);
diff --git a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts
index 895c99b..fa547dc 100644
--- a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts
+++ b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts
@@ -30,7 +30,7 @@
 
 @customElement('gr-alert')
 export class GrAlert extends LitElement {
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
@@ -43,7 +43,6 @@
           bottom: 1.25rem;
           border-radius: var(--border-radius);
           box-shadow: var(--elevation-level-2);
-          color: var(--tooltip-text-color);
           left: 1.25rem;
           position: fixed;
           transform: translateY(5rem);
@@ -73,11 +72,10 @@
           vertical-align: bottom;
           word-break: break-all;
         }
-        .action {
-          color: var(--link-color);
-          font-weight: var(--font-weight-bold);
+        gr-button.action {
+          --text-color: var(--tooltip-button-text-color);
+          --gr-button-padding: 0 var(--spacing-s);
           margin-left: var(--spacing-l);
-          text-decoration: none;
         }
       `,
     ];
@@ -93,18 +91,9 @@
     >`;
   }
 
-  render() {
-    // To pass CSS mixins for @apply to Polymer components, they need to appear
-    // in <style> inside the template.
-    const style = html`<style>
-      .action {
-        --gr-button: {
-          padding: 0;
-        }
-      }
-    </style>`;
+  override render() {
     const {text, actionText} = this;
-    return html`${style}
+    return html`
       <div class="content-wrapper">
         <span class="text">${text}</span>
         <gr-button
@@ -115,7 +104,8 @@
           >${actionText}
         </gr-button>
         ${this.renderDismissButton()}
-      </div> `;
+      </div>
+    `;
   }
 
   /**
diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts
index 3f52650..524b197 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts
@@ -26,9 +26,10 @@
 import {property, customElement, observe} from '@polymer/decorators';
 import {GrAutocompleteDropdown} from '../gr-autocomplete-dropdown/gr-autocomplete-dropdown';
 import {PaperInputElementExt} from '../../../types/types';
-import {CustomKeyboardEvent} from '../../../types/events';
 import {fireEvent} from '../../../utils/event-util';
 import {debounce, DelayedTask} from '../../../utils/async-util';
+import {PropertyType} from '../../../types/common';
+import {modifierPressed} from '../../../utils/dom-util';
 
 const TOKENIZE_REGEX = /(?:[^\s"]+|"[^"]*")+/g;
 const DEBOUNCE_WAIT_MS = 200;
@@ -40,9 +41,9 @@
   };
 }
 
-export type AutocompleteQuery = (
+export type AutocompleteQuery<T = string> = (
   text: string
-) => Promise<AutocompleteSuggestion[]>;
+) => Promise<Array<AutocompleteSuggestion<T>>>;
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -50,11 +51,11 @@
   }
 }
 
-export interface AutocompleteSuggestion {
+export interface AutocompleteSuggestion<T = string> {
   name?: string;
   label?: string;
-  value?: string;
-  text?: string;
+  value?: T;
+  text?: T;
 }
 
 export interface AutocompleteCommitEventDetail {
@@ -102,7 +103,7 @@
    *
    */
   @property({type: Object})
-  query: AutocompleteQuery = () => Promise.resolve([]);
+  query?: AutocompleteQuery = () => Promise.resolve([]);
 
   /**
    * The number of characters that must be typed before suggestions are
@@ -298,6 +299,12 @@
     if (this._disableSuggestions) {
       return;
     }
+
+    const query = this.query;
+    if (!query) {
+      return;
+    }
+
     if (text.length < threshold) {
       this.value = '';
       return;
@@ -308,7 +315,7 @@
     }
 
     const update = () => {
-      this.query(text).then(suggestions => {
+      query(text).then(suggestions => {
         if (text !== this.text) {
           // Late response.
           return;
@@ -351,7 +358,7 @@
    * _handleKeydown used for key handling in the this.$.input AND all child
    * autocomplete options.
    */
-  _handleKeydown(e: CustomKeyboardEvent) {
+  _handleKeydown(e: KeyboardEvent) {
     this._focused = true;
     switch (e.keyCode) {
       case 38: // Up
@@ -376,7 +383,7 @@
         }
         break;
       case 13: // Enter
-        if (this.modifierPressed(e)) {
+        if (modifierPressed(e)) {
           break;
         }
         e.preventDefault();
@@ -505,3 +512,24 @@
     return showSearchIcon ? 'showSearchIcon' : '';
   }
 }
+
+/**
+ * Often gr-autocomplete is used for BranchName, RepoName, etc...
+ * GrTypedAutocomplete allows to define more precise typing in templates.
+ * For example, instead of
+ * $: {
+ *   branchSelect: GrAutocomplete
+ * }
+ * you can write
+ * $: {
+ *   branchSelect: GrTypedAutocomplete<BranchName>
+ * }
+ * And later user $.branchSelect.text without type conversion to BranchName.
+ */
+export interface GrTypedAutocomplete<
+  T extends PropertyType<GrAutocomplete, 'text'>
+> extends GrAutocomplete {
+  text: T;
+  value: T;
+  query?: AutocompleteQuery<T>;
+}
diff --git a/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts b/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
index 1ece10a..8dc23e2 100644
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
+++ b/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
@@ -15,21 +15,13 @@
  * limitations under the License.
  */
 import '@polymer/paper-button/paper-button';
-import '../../../styles/shared-styles';
-import '../../../styles/gr-voting-styles';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {customElement, property, computed, observe} from '@polymer/decorators';
-import {htmlTemplate} from './gr-button_html';
-import {TooltipMixin} from '../../../mixins/gr-tooltip-mixin/gr-tooltip-mixin';
-import {
-  PolymerEvent,
-  getEventPath,
-  getKeyboardEvent,
-  isModifierPressed,
-} from '../../../utils/dom-util';
+import {spinnerStyles} from '../../../styles/gr-spinner-styles';
+import {votingStyles} from '../../../styles/gr-voting-styles';
+import {css, html, LitElement, PropertyValues} from 'lit';
+import {customElement, property} from 'lit/decorators';
+import {getEventPath, modifierPressed} from '../../../utils/dom-util';
 import {appContext} from '../../../services/app-context';
 import {ReportingService} from '../../../services/gr-reporting/gr-reporting';
-import {CustomKeyboardEvent} from '../../../types/events';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -37,87 +29,208 @@
   }
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = TooltipMixin(PolymerElement);
-
 @customElement('gr-button')
-export class GrButton extends base {
-  static get template() {
-    return htmlTemplate;
-  }
+export class GrButton extends LitElement {
+  private readonly reporting: ReportingService = appContext.reportingService;
 
   /**
    * Should this button be rendered as a vote chip? Then we are applying
    * the .voteChip class (see gr-voting-styles) to the paper-button.
    */
-  @property({type: Boolean, reflectToAttribute: true})
+  @property({type: Boolean, reflect: true})
   voteChip = false;
 
-  @property({type: Boolean, reflectToAttribute: true})
-  downArrow = false;
-
-  @property({type: Boolean, reflectToAttribute: true})
-  link = false;
-
-  @property({type: Boolean})
-  noUppercase = false;
-
-  @property({type: Boolean, reflectToAttribute: true})
-  loading = false;
-
-  @property({type: Boolean, reflectToAttribute: true})
-  disabled: boolean | null = null;
-
-  @property({type: String})
-  tooltip = '';
-
   // Note: don't assign a value to this, since constructor is called
   // after created, the initial value maybe overridden by this
-  @property({type: String})
-  _initialTabindex?: string;
+  private initialTabindex?: string;
 
-  @computed('disabled', 'loading')
-  get _disabled() {
-    return this.disabled || this.loading;
+  @property({type: Boolean, reflect: true, attribute: 'down-arrow'})
+  downArrow = false;
+
+  @property({type: Boolean, reflect: true})
+  link = false;
+
+  @property({type: Boolean, reflect: true})
+  loading = false;
+
+  @property({type: Boolean, reflect: true})
+  disabled: boolean | null = null;
+
+  static override get styles() {
+    return [
+      votingStyles,
+      spinnerStyles,
+      css`
+        /* general styles for all buttons */
+        :host {
+          --background-color: var(
+            --button-background-color,
+            var(--default-button-background-color)
+          );
+          --text-color: var(
+            --gr-button-text-color,
+            var(--default-button-text-color)
+          );
+          display: inline-block;
+          position: relative;
+        }
+        :host([hidden]) {
+          display: none;
+        }
+        :host([no-uppercase]) paper-button {
+          text-transform: none;
+        }
+        paper-button {
+          /* paper-button sets this to anti-aliased, which appears different than
+            bold font elsewhere on macOS. */
+          -webkit-font-smoothing: initial;
+          align-items: center;
+          background-color: var(--background-color);
+          color: var(--text-color);
+          display: flex;
+          font-family: inherit;
+          justify-content: center;
+          margin: var(--margin, 0);
+          min-width: var(--border, 0);
+          padding: var(--gr-button-padding, var(--spacing-s) var(--spacing-m));
+        }
+        paper-button[elevation='1'] {
+          box-shadow: var(--elevation-level-1);
+        }
+        paper-button[elevation='2'] {
+          box-shadow: var(--elevation-level-2);
+        }
+        paper-button[elevation='3'] {
+          box-shadow: var(--elevation-level-3);
+        }
+        paper-button[elevation='4'] {
+          box-shadow: var(--elevation-level-4);
+        }
+        paper-button[elevation='5'] {
+          box-shadow: var(--elevation-level-5);
+        }
+        paper-button:hover {
+          background: linear-gradient(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.12)),
+            var(--background-color);
+        }
+
+        /* Some mobile browsers treat focused element as hovered element.
+        As a result, element remains hovered after click (has grey background in default theme).
+        Use @media (hover:none) to remove background if
+        user's primary input mechanism can't hover over elements.
+        See: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/hover
+
+        Note 1: not all browsers support this media query
+        (see https://caniuse.com/#feat=css-media-interaction).
+        If browser doesn't support it, then the whole content of @media .. is ignored.
+        This is why the default behavior is placed outside of @media.
+        */
+        @media (hover: none) {
+          paper-button:hover {
+            background: transparent;
+          }
+        }
+
+        :host([primary]) {
+          --background-color: var(--primary-button-background-color);
+          --text-color: var(--primary-button-text-color);
+        }
+        :host([link][primary]) {
+          --text-color: var(--primary-button-background-color);
+        }
+
+        /* Keep below color definition for primary so that this takes precedence
+          when disabled. */
+        :host([disabled]),
+        :host([loading]) {
+          --background-color: var(--disabled-button-background-color);
+          --text-color: var(--deemphasized-text-color);
+          cursor: default;
+        }
+
+        /* Styles for link buttons specifically */
+        :host([link]) {
+          --background-color: transparent;
+          --margin: 0;
+        }
+        :host([link]) paper-button {
+          padding: var(--gr-button-padding, var(--spacing-s));
+        }
+        :host([disabled][link]),
+        :host([loading][link]) {
+          --background-color: transparent;
+          --text-color: var(--deemphasized-text-color);
+          cursor: default;
+        }
+
+        /* Styles for the optional down arrow */
+        :host(:not([down-arrow])) .downArrow {
+          display: none;
+        }
+        :host([down-arrow]) .downArrow {
+          border-top: 0.36em solid #ccc;
+          border-left: 0.36em solid transparent;
+          border-right: 0.36em solid transparent;
+          margin-bottom: var(--spacing-xxs);
+          margin-left: var(--spacing-m);
+          transition: border-top-color 200ms;
+        }
+        :host([down-arrow]) paper-button:hover .downArrow {
+          border-top-color: var(--deemphasized-text-color);
+        }
+      `,
+    ];
   }
 
-  @property({
-    computed: 'computeAriaDisabled(disabled, loading)',
-    reflectToAttribute: true,
-    type: String,
-  })
-  ariaDisabled!: string;
-
-  computeAriaDisabled() {
-    return this._disabled ? 'true' : 'false';
+  override render() {
+    return html`<paper-button
+      ?raised="${!this.link}"
+      ?disabled="${this.disabled || this.loading}"
+      role="button"
+      tabindex="-1"
+      part="paper-button"
+      class="${this.voteChip ? 'voteChip' : ''}"
+    >
+      ${this.loading ? html`<span class="loadingSpin"></span>` : ''}
+      <slot></slot>
+      <i class="downArrow"></i>
+    </paper-button>`;
   }
 
-  computePaperButtonClass(voteChip?: boolean) {
-    return voteChip ? 'voteChip' : '';
-  }
-
-  private readonly reporting: ReportingService = appContext.reportingService;
-
   constructor() {
     super();
-    this._initialTabindex = this.getAttribute('tabindex') || '0';
-    // TODO(TS): try avoid using unknown
-    this.addEventListener('click', e =>
-      this._handleAction(e as unknown as PolymerEvent)
-    );
-    this.addEventListener('keydown', e =>
-      this._handleKeydown(e as unknown as CustomKeyboardEvent)
-    );
+    this.initialTabindex = this.getAttribute('tabindex') || '0';
+    this.addEventListener('click', e => this._handleAction(e));
+    this.addEventListener('keydown', e => this._handleKeydown(e));
   }
 
-  override ready() {
-    super.ready();
-    this._ensureAttribute('role', 'button');
-    this._ensureAttribute('tabindex', '0');
+  override updated(changedProperties: PropertyValues) {
+    if (changedProperties.has('disabled')) {
+      this.setAttribute(
+        'tabindex',
+        this.disabled ? '-1' : this.initialTabindex || '0'
+      );
+    }
+    if (changedProperties.has('loading') || changedProperties.has('disabled')) {
+      this.setAttribute(
+        'aria-disabled',
+        this.disabled || this.loading ? 'true' : 'false'
+      );
+    }
   }
 
-  _handleAction(e: PolymerEvent) {
-    if (this._disabled) {
+  override connectedCallback() {
+    super.connectedCallback();
+    if (!this.getAttribute('role')) {
+      this.setAttribute('role', 'button');
+    }
+    if (!this.getAttribute('tabindex')) {
+      this.setAttribute('tabindex', '0');
+    }
+  }
+
+  _handleAction(e: MouseEvent) {
+    if (this.disabled || this.loading) {
       e.preventDefault();
       e.stopPropagation();
       e.stopImmediatePropagation();
@@ -127,20 +240,8 @@
     this.reporting.reportInteraction('button-click', {path: getEventPath(e)});
   }
 
-  @observe('disabled')
-  _disabledChanged(disabled: boolean) {
-    this.setAttribute(
-      'tabindex',
-      disabled ? '-1' : this._initialTabindex || '0'
-    );
-    this.updateStyles();
-  }
-
-  _handleKeydown(e: CustomKeyboardEvent) {
-    if (isModifierPressed(e)) {
-      return;
-    }
-    e = getKeyboardEvent(e);
+  _handleKeydown(e: KeyboardEvent) {
+    if (modifierPressed(e)) return;
     // Handle `enter`, `space`.
     if (e.keyCode === 13 || e.keyCode === 32) {
       e.preventDefault();
diff --git a/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts b/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts
deleted file mode 100644
index 22ec2f4..0000000
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts
+++ /dev/null
@@ -1,188 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-voting-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="gr-spinner-styles">
-    /* general styles for all buttons */
-    :host {
-      --background-color: var(
-        --button-background-color,
-        var(--default-button-background-color)
-      );
-      --text-color: var(--default-button-text-color);
-      display: inline-block;
-      position: relative;
-    }
-    :host([hidden]) {
-      display: none;
-    }
-    :host([no-uppercase]) paper-button {
-      text-transform: none;
-    }
-    paper-button {
-      /* The next lines contains a copy of paper-button style.
-          Without a copy, the @apply works incorrectly with Polymer 2.
-          @apply is deprecated and is not recommended to use. It is expected
-          that @apply will be replaced with the ::part CSS pseudo-element.
-          After replacement copied lines can be removed.
-        */
-      @apply --layout-inline;
-      @apply --layout-center-center;
-      position: relative;
-      box-sizing: border-box;
-      min-width: 5.14em;
-      margin: 0 0.29em;
-      background: transparent;
-      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
-      -webkit-tap-highlight-color: transparent;
-      font: inherit;
-      text-transform: uppercase;
-      outline-width: 0;
-      border-top-left-radius: var(--border-radius);
-      border-top-right-radius: var(--border-radius);
-      border-bottom-right-radius: var(--border-radius);
-      border-bottom-left-radius: var(--border-radius);
-      -moz-user-select: none;
-      -ms-user-select: none;
-      -webkit-user-select: none;
-      user-select: none;
-      cursor: pointer;
-      z-index: 0;
-      padding: var(--spacing-m);
-
-      @apply --paper-font-common-base;
-      @apply --paper-button;
-      /* End of copy*/
-
-      /* paper-button sets this to anti-aliased, which appears different than
-          bold font elsewhere on macOS. */
-      -webkit-font-smoothing: initial;
-      align-items: center;
-      background-color: var(--background-color);
-      color: var(--text-color);
-      display: flex;
-      font-family: inherit;
-      justify-content: center;
-      margin: var(--margin, 0);
-      min-width: var(--border, 0);
-      padding: var(--padding, 4px 8px);
-      @apply --gr-button;
-    }
-    /* https://github.com/PolymerElements/paper-button/blob/2.x/paper-button.html */
-    /* BEGIN: Copy from paper-button */
-    paper-button[elevation='1'] {
-      @apply --paper-material-elevation-1;
-    }
-    paper-button[elevation='2'] {
-      @apply --paper-material-elevation-2;
-    }
-    paper-button[elevation='3'] {
-      @apply --paper-material-elevation-3;
-    }
-    paper-button[elevation='4'] {
-      @apply --paper-material-elevation-4;
-    }
-    paper-button[elevation='5'] {
-      @apply --paper-material-elevation-5;
-    }
-    /* END: Copy from paper-button */
-    paper-button:hover {
-      background: linear-gradient(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.12)),
-        var(--background-color);
-    }
-
-    /* Some mobile browsers treat focused element as hovered element.
-      As a result, element remains hovered after click (has grey background in default theme).
-      Use @media (hover:none) to remove background if
-      user's primary input mechanism can't hover over elements.
-      See: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/hover
-
-      Note 1: not all browsers support this media query
-      (see https://caniuse.com/#feat=css-media-interaction).
-      If browser doesn't support it, then the whole content of @media .. is ignored.
-      This is why the default behavior is placed outside of @media.
-      */
-    @media (hover: none) {
-      paper-button:hover {
-        background: transparent;
-      }
-    }
-
-    :host([primary]) {
-      --background-color: var(--primary-button-background-color);
-      --text-color: var(--primary-button-text-color);
-    }
-    :host([link][primary]) {
-      --text-color: var(--primary-button-background-color);
-    }
-
-    /* Keep below color definition for primary so that this takes precedence
-        when disabled. */
-    :host([disabled]),
-    :host([loading]) {
-      --background-color: var(--disabled-button-background-color);
-      --text-color: var(--deemphasized-text-color);
-      cursor: default;
-    }
-
-    /* Styles for link buttons specifically */
-    :host([link]) {
-      --background-color: transparent;
-      --margin: 0;
-      --padding: var(--spacing-s);
-    }
-    :host([disabled][link]),
-    :host([loading][link]) {
-      --background-color: transparent;
-      --text-color: var(--deemphasized-text-color);
-      cursor: default;
-    }
-
-    /* Styles for the optional down arrow */
-    :host(:not([down-arrow])) .downArrow {
-      display: none;
-    }
-    :host([down-arrow]) .downArrow {
-      border-top: 0.36em solid #ccc;
-      border-left: 0.36em solid transparent;
-      border-right: 0.36em solid transparent;
-      margin-bottom: var(--spacing-xxs);
-      margin-left: var(--spacing-m);
-      transition: border-top-color 200ms;
-    }
-    :host([down-arrow]) paper-button:hover .downArrow {
-      border-top-color: var(--deemphasized-text-color);
-    }
-  </style>
-  <paper-button
-    raised="[[!link]]"
-    disabled="[[_disabled]]"
-    tabindex="-1"
-    part="paper-button"
-    class$="[[computePaperButtonClass(voteChip)]]"
-  >
-    <template is="dom-if" if="[[loading]]">
-      <span class="loadingSpin"></span>
-    </template>
-    <slot></slot>
-    <i class="downArrow"></i>
-  </paper-button>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-button/gr-button_test.ts b/polygerrit-ui/app/elements/shared/gr-button/gr-button_test.ts
index f0f122a..0149bd5 100644
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-button/gr-button_test.ts
@@ -17,6 +17,7 @@
 
 import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
 import '../../../test/common-test-setup-karma';
+import './gr-button';
 import {addListener} from '@polymer/polymer/lib/utils/gestures';
 import {appContext} from '../../../services/app-context';
 import {html} from '@polymer/polymer/lib/utils/html-tag';
@@ -49,23 +50,26 @@
     return spy;
   };
 
-  setup(() => {
+  setup(async () => {
     element = basicFixture.instantiate();
+    await element.updateComplete;
   });
 
-  test('disabled is set by disabled', () => {
+  test('disabled is set by disabled', async () => {
     const paperBtn = queryAndAssert<PaperButtonElement>(
       element,
       'paper-button'
     );
     assert.isFalse(paperBtn.disabled);
     element.disabled = true;
+    await element.updateComplete;
     assert.isTrue(paperBtn.disabled);
     element.disabled = false;
+    await element.updateComplete;
     assert.isFalse(paperBtn.disabled);
   });
 
-  test('loading set from listener', () => {
+  test('loading set from listener', async () => {
     let resolve: Function;
     element.addEventListener('click', e => {
       const target = e.target as HTMLElement;
@@ -78,36 +82,44 @@
     );
     assert.isFalse(paperBtn.disabled);
     MockInteractions.tap(element);
+    await element.updateComplete;
     assert.isTrue(paperBtn.disabled);
     assert.isTrue(element.hasAttribute('loading'));
     resolve!();
-    flush();
+    await element.updateComplete;
     assert.isFalse(paperBtn.disabled);
     assert.isFalse(element.hasAttribute('loading'));
   });
 
-  test('tabindex should be -1 if disabled', () => {
+  test('tabindex should be -1 if disabled', async () => {
     element.disabled = true;
-    assert.isTrue(element.getAttribute('tabindex') === '-1');
+    await element.updateComplete;
+    assert.equal(element.getAttribute('tabindex'), '-1');
   });
 
   // Regression tests for Issue: 11969
-  test('tabindex should be reset to 0 if enabled', () => {
+  test('tabindex should be reset to 0 if enabled', async () => {
     element.disabled = false;
+    await element.updateComplete;
     assert.equal(element.getAttribute('tabindex'), '0');
     element.disabled = true;
+    await element.updateComplete;
     assert.equal(element.getAttribute('tabindex'), '-1');
     element.disabled = false;
+    await element.updateComplete;
     assert.equal(element.getAttribute('tabindex'), '0');
   });
 
-  test('tabindex should be preserved', () => {
+  test('tabindex should be preserved', async () => {
     const tabIndexElement = tabindexFixture.instantiate() as GrButton;
     tabIndexElement.disabled = false;
+    await element.updateComplete;
     assert.equal(tabIndexElement.getAttribute('tabindex'), '3');
     tabIndexElement.disabled = true;
+    await element.updateComplete;
     assert.equal(tabIndexElement.getAttribute('tabindex'), '-1');
     tabIndexElement.disabled = false;
+    await element.updateComplete;
     assert.equal(tabIndexElement.getAttribute('tabindex'), '3');
   });
 
@@ -152,8 +164,9 @@
   }
 
   suite('disabled', () => {
-    setup(() => {
+    setup(async () => {
       element.disabled = true;
+      await element.updateComplete;
     });
 
     for (const eventName of ['tap', 'click']) {
diff --git a/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.ts b/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.ts
index 5069ba4..a23621e 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.ts
+++ b/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.ts
@@ -21,6 +21,11 @@
 import {customElement, property} from '@polymer/decorators';
 import {ChangeInfo} from '../../../types/common';
 import {fireAlert} from '../../../utils/event-util';
+import {
+  Shortcut,
+  ShortcutSection,
+} from '../../../services/shortcuts/shortcuts-config';
+import {appContext} from '../../../services/app-context';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -48,6 +53,8 @@
   @property({type: Object, notify: true})
   change?: ChangeInfo;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   _computeStarClass(starred?: boolean) {
     return starred ? 'active' : '';
   }
@@ -83,4 +90,8 @@
       })
     );
   }
+
+  createTitle(shortcutName: Shortcut, section: ShortcutSection) {
+    return this.shortcuts.createTitle(shortcutName, section);
+  }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts
index 2ca2744b..455bd4e 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status_html.ts
@@ -80,8 +80,8 @@
     }
   </style>
   <gr-tooltip-content
-    has-tooltip=""
-    position-below=""
+    has-tooltip
+    position-below
     title="[[tooltipText]]"
     max-width="40em"
   >
@@ -101,9 +101,8 @@
       </a>
     </template>
     <template is="dom-if" if="[[!hasStatusLink(revertedChange, resolveWeblinks, status)]]">
-      <div class="chip" aria-label$="Label: [[status]]">
-        [[_computeStatusString(status)]]
-      </div>
+      <div class="chip" aria-label$="Label: [[status]]"
+      >[[_computeStatusString(status)]]</div>
     </template>
   </gr-tooltip-content>
 </span>
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
index 82f6b46..f1b74ac 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
@@ -14,9 +14,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import '../../../styles/gr-a11y-styles';
 import '../../../styles/shared-styles';
 import '../gr-comment/gr-comment';
 import '../../diff/gr-diff/gr-diff';
+import '../gr-copy-clipboard/gr-copy-clipboard';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-comment-thread_html';
 import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
@@ -29,6 +31,7 @@
   UIComment,
   UIDraft,
   UIRobot,
+  DraftInfo,
 } from '../../../utils/comment-util';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {appContext} from '../../../services/app-context';
@@ -51,12 +54,12 @@
 } from '../../../types/common';
 import {GrComment} from '../gr-comment/gr-comment';
 import {PolymerDeepPropertyChange} from '@polymer/polymer/interfaces';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 import {LineNumber, FILE} from '../../diff/gr-diff/gr-diff-line';
 import {GrButton} from '../gr-button/gr-button';
 import {KnownExperimentId} from '../../../services/flags/flags';
 import {DiffInfo, DiffPreferencesInfo} from '../../../types/diff';
-import {RenderPreferences} from '../../../api/diff';
+import {DiffLayer, RenderPreferences} from '../../../api/diff';
 import {
   check,
   assertIsDefined,
@@ -204,8 +207,8 @@
   @property({type: Object})
   _selfAccount?: AccountDetailInfo;
 
-  @property({type: Boolean})
-  disableTokenHighlighting = false;
+  @property({type: Array})
+  layers: DiffLayer[] = [];
 
   get keyBindings() {
     return {
@@ -225,15 +228,15 @@
 
   readonly restApiService = appContext.restApiService;
 
+  private readonly shortcuts = appContext.shortcutsService;
+
   constructor() {
     super();
     this.addEventListener('comment-update', e =>
       this._handleCommentUpdate(e as CustomEvent)
     );
     appContext.restApiService.getPreferences().then(prefs => {
-      if (prefs?.disable_token_highlighting) {
-        this.disableTokenHighlighting = prefs.disable_token_highlighting;
-      }
+      this._initLayers(!!prefs?.disable_token_highlighting);
     });
   }
 
@@ -350,7 +353,8 @@
     return GerritNav.getUrlForComment(changeNum, projectName, id);
   }
 
-  getHighlightRange() {
+  /** The parameter is for triggering re-computation only. */
+  getHighlightRange(_: unknown) {
     const comment = this.comments?.[0];
     if (!comment) return undefined;
     if (comment.range) return comment.range;
@@ -365,26 +369,23 @@
     return undefined;
   }
 
-  _getLayers(diff?: DiffInfo) {
-    if (!diff) return [];
-    const layers = [];
+  _initLayers(disableTokenHighlighting: boolean) {
     if (
       this.flagsService.isEnabled(KnownExperimentId.TOKEN_HIGHLIGHTING) &&
-      !this.disableTokenHighlighting
+      !disableTokenHighlighting
     ) {
-      layers.push(new TokenHighlightLayer(this));
+      this.layers.push(new TokenHighlightLayer(this));
     }
-    layers.push(this.syntaxLayer);
-    return layers;
+    this.layers.push(this.syntaxLayer);
   }
 
   _getUrlForViewDiff(
     comments: UIComment[],
     changeNum?: NumericChangeId,
     projectName?: RepoName
-  ) {
-    if (!changeNum) return;
-    if (!projectName) return;
+  ): string {
+    if (!changeNum) return '';
+    if (!projectName) return '';
     check(comments.length > 0, 'comment not found');
     return GerritNav.getUrlForComment(changeNum, projectName, comments[0].id!);
   }
@@ -430,7 +431,7 @@
     });
   }
 
-  _isPatchsetLevelComment(path: string) {
+  _isPatchsetLevelComment(path?: string) {
     return path === SpecialFilePath.PATCHSET_LEVEL_COMMENTS;
   }
 
@@ -439,7 +440,7 @@
     return this.showPortedComment && comment.id === this._orderedComments[0].id;
   }
 
-  _computeDisplayPath(path: string) {
+  _computeDisplayPath(path?: string) {
     const displayPath = computeDisplayPath(path);
     if (displayPath === SpecialFilePath.PATCHSET_LEVEL_COMMENTS) {
       return 'Patchset';
@@ -498,8 +499,8 @@
     return this._orderedComments[this._orderedComments.length - 1] || {};
   }
 
-  _handleEKey(e: CustomKeyboardEvent) {
-    if (this.shouldSuppressKeyboardShortcut(e)) {
+  _handleEKey(e: IronKeyboardEvent) {
+    if (this.shortcuts.shouldSuppress(e)) {
       return;
     }
 
@@ -563,14 +564,23 @@
 
     if (isEditing) {
       reply.__editing = true;
-    }
-
-    this.commentsService.addDraft(reply);
-
-    if (!isEditing) {
+      this.commentsService.addDraft(reply);
+    } else {
       assertIsDefined(this.changeNum, 'changeNum');
       assertIsDefined(this.patchNum, 'patchNum');
-      this.restApiService.saveDiffDraft(this.changeNum, this.patchNum, reply);
+      this.restApiService
+        .saveDiffDraft(this.changeNum, this.patchNum, reply)
+        .then(result => {
+          if (!result.ok) {
+            fireAlert(document, 'Unable to restore draft');
+            return;
+          }
+          this.restApiService.getResponseObject(result).then(obj => {
+            const resComment = obj as unknown as DraftInfo;
+            resComment.patch_set = reply.patch_set;
+            this.commentsService.addDraft(resComment);
+          });
+        });
     }
   }
 
@@ -745,7 +755,8 @@
     return -1;
   }
 
-  _computeHostClass(unresolved?: boolean) {
+  /** 2nd parameter is for triggering re-computation only. */
+  _computeHostClass(unresolved?: boolean, _?: unknown) {
     if (this.isRobotComment) {
       return 'robotComment';
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
index bf9a9dc..c3faaa5 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
@@ -17,6 +17,9 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 
 export const htmlTemplate = html`
+  <style include="gr-a11y-styles">
+    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
+  </style>
   <style include="shared-styles">
     :host {
       font-family: var(--font-family);
@@ -113,6 +116,16 @@
       top: 4px;
       cursor: pointer;
     }
+    .fileName gr-copy-clipboard {
+      display: inline-block;
+      visibility: hidden;
+      vertical-align: top;
+      --gr-button-padding: 0px;
+    }
+    .fileName:focus-within gr-copy-clipboard,
+    .fileName:hover gr-copy-clipboard {
+      visibility: visible;
+    }
   </style>
 
   <template is="dom-if" if="[[showFilePath]]">
@@ -127,6 +140,10 @@
           >
             [[_computeDisplayPath(path)]]
           </a>
+          <gr-copy-clipboard
+            hideInput=""
+            text="[[_computeDisplayPath(path)]]"
+          ></gr-copy-clipboard>
         </template>
       </div>
     </template>
@@ -229,7 +246,7 @@
           id="diff"
           change-num="[[changeNum]]"
           diff="[[_diff]]"
-          layers="[[_getLayers(_diff)]]"
+          layers="[[layers]]"
           path="[[path]]"
           prefs="[[_prefs]]"
           render-prefs="[[_renderPrefs]]"
@@ -238,9 +255,7 @@
         </gr-diff>
         <div class="view-diff-container">
           <a href="[[_getUrlForViewDiff(comments, changeNum, projectName)]]">
-            <gr-button link class="view-diff-button" on-click="_handleViewDiff">
-              View Diff
-            </gr-button>
+            <gr-button link class="view-diff-button">View Diff</gr-button>
           </a>
         </div>
       </div>
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
index ecd9731..06d25b3 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
@@ -315,58 +315,64 @@
   let element: GrCommentThread;
   let addDraftServiceStub: SinonStub;
   let saveDiffDraftStub: SinonStub;
+  let comment = {
+    id: '7afa4931_de3d65bd',
+    path: '/path/to/file.txt',
+    line: 5,
+    in_reply_to: 'baf0414d_60047215' as UrlEncodedCommentId,
+    updated: '2015-12-21 02:01:10.850000000',
+    message: 'Done',
+  };
+  const peanutButterComment = {
+    author: {
+      name: 'Mr. Peanutbutter',
+      email: 'tenn1sballchaser@aol.com' as EmailAddress as EmailAddress,
+    },
+    id: 'baf0414d_60047215' as UrlEncodedCommentId,
+    line: 5,
+    in_reply_to: 'baf0414d_60047215' as UrlEncodedCommentId,
+    message: 'is this a crossover episode!?',
+    updated: '2015-12-08 19:48:33.843000000' as Timestamp,
+    path: '/path/to/file.txt',
+    unresolved: true,
+    patch_set: 3 as PatchSetNum,
+  };
+  const mockResponse: Response = {
+    ...new Response(),
+    headers: {} as Headers,
+    redirected: false,
+    status: 200,
+    statusText: '',
+    type: '' as ResponseType,
+    url: '',
+    ok: true,
+    text() {
+      return Promise.resolve(")]}'\n" + JSON.stringify(comment));
+    },
+  };
+  let saveDiffDraftPromiseResolver: (value?: Response) => void;
   setup(() => {
     addDraftServiceStub = stubComments('addDraft');
     stubRestApi('getLoggedIn').returns(Promise.resolve(false));
     saveDiffDraftStub = stubRestApi('saveDiffDraft').returns(
-      Promise.resolve({
-        headers: {} as Headers,
-        redirected: false,
-        status: 200,
-        statusText: '',
-        type: '' as ResponseType,
-        url: '',
-        ok: true,
-        text() {
-          return Promise.resolve(
-            ")]}'\n" +
-              JSON.stringify({
-                id: '7afa4931_de3d65bd',
-                path: '/path/to/file.txt',
-                line: 5,
-                in_reply_to: 'baf0414d_60047215' as UrlEncodedCommentId,
-                updated: '2015-12-21 02:01:10.850000000',
-                message: 'Done',
-              })
-          );
-        },
-      } as unknown as Response)
+      new Promise<Response>(
+        resolve =>
+          (saveDiffDraftPromiseResolver = resolve as (value?: Response) => void)
+      )
     );
     stubRestApi('deleteDiffDraft').returns(
-      Promise.resolve({ok: true} as unknown as Response)
+      Promise.resolve({...new Response(), ok: true})
     );
     element = withCommentFixture.instantiate();
     element.patchNum = 1 as PatchSetNum;
     element.changeNum = 1 as NumericChangeId;
-    element.comments = [
-      {
-        author: {
-          name: 'Mr. Peanutbutter',
-          email: 'tenn1sballchaser@aol.com' as EmailAddress as EmailAddress,
-        },
-        id: 'baf0414d_60047215' as UrlEncodedCommentId,
-        line: 5,
-        message: 'is this a crossover episode!?',
-        updated: '2015-12-08 19:48:33.843000000' as Timestamp,
-        path: '/path/to/file.txt',
-        unresolved: true,
-        patch_set: 3 as PatchSetNum,
-      },
-    ];
+    element.comments = [peanutButterComment];
     flush();
   });
 
   test('reply', () => {
+    saveDiffDraftPromiseResolver(mockResponse);
+
     const commentEl = element.shadowRoot?.querySelector('gr-comment');
     const reportStub = stubReporting('recordDraftInteraction');
     assert.ok(commentEl);
@@ -385,6 +391,8 @@
   });
 
   test('quote reply', () => {
+    saveDiffDraftPromiseResolver(mockResponse);
+
     const commentEl = element.shadowRoot?.querySelector('gr-comment');
     const reportStub = stubReporting('recordDraftInteraction');
     assert.ok(commentEl);
@@ -394,6 +402,10 @@
     flush();
 
     const draft = addDraftServiceStub.firstCall.args[0];
+    // the quote reply is not autmatically saved so verify that id is not set
+    assert.isNotOk(draft.id);
+    // verify that the draft returned was not saved
+    assert.isNotOk(saveDiffDraftStub.called);
     assert.equal(draft.message, '> is this a crossover episode!?\n\n');
     assert.equal(
       draft.in_reply_to,
@@ -403,6 +415,7 @@
   });
 
   test('quote reply multiline', () => {
+    saveDiffDraftPromiseResolver(mockResponse);
     const reportStub = stubReporting('recordDraftInteraction');
     element.comments = [
       {
@@ -436,6 +449,15 @@
   });
 
   test('ack', async () => {
+    saveDiffDraftPromiseResolver(mockResponse);
+    comment = {
+      id: '7afa4931_de3d65bd',
+      path: '/path/to/file.txt',
+      line: 5,
+      in_reply_to: 'baf0414d_60047215' as UrlEncodedCommentId,
+      updated: '2015-12-21 02:01:10.850000000',
+      message: 'Ack',
+    };
     const reportStub = stubReporting('recordDraftInteraction');
     element.changeNum = 42 as NumericChangeId;
     element.patchNum = 1 as PatchSetNum;
@@ -450,11 +472,20 @@
     const draft = addDraftServiceStub.firstCall.args[0];
     assert.equal(draft.message, 'Ack');
     assert.equal(draft.in_reply_to, 'baf0414d_60047215' as UrlEncodedCommentId);
-    assert.equal(draft.unresolved, false);
+    assert.isNotOk(draft.unresolved);
     assert.isTrue(reportStub.calledOnce);
   });
 
   test('done', async () => {
+    saveDiffDraftPromiseResolver(mockResponse);
+    comment = {
+      id: '7afa4931_de3d65bd',
+      path: '/path/to/file.txt',
+      line: 5,
+      in_reply_to: 'baf0414d_60047215' as UrlEncodedCommentId,
+      updated: '2015-12-21 02:01:10.850000000',
+      message: 'Done',
+    };
     const reportStub = stubReporting('recordDraftInteraction');
     assert.isFalse(saveDiffDraftStub.called);
     element.changeNum = 42 as NumericChangeId;
@@ -467,14 +498,18 @@
     tap(doneBtn!);
     await flush();
     const draft = addDraftServiceStub.firstCall.args[0];
+    // Since the reply is automatically saved, verify that draft.id is set in
+    // the model
+    assert.equal(draft.id, '7afa4931_de3d65bd');
     assert.equal(draft.message, 'Done');
     assert.equal(draft.in_reply_to, 'baf0414d_60047215' as UrlEncodedCommentId);
-    assert.isFalse(draft.unresolved);
+    assert.isNotOk(draft.unresolved);
     assert.isTrue(reportStub.calledOnce);
     assert.isTrue(saveDiffDraftStub.called);
   });
 
   test('save', async () => {
+    saveDiffDraftPromiseResolver(mockResponse);
     element.changeNum = 42 as NumericChangeId;
     element.patchNum = 1 as PatchSetNum;
     element.path = '/path/to/file.txt';
@@ -488,13 +523,21 @@
   });
 
   test('please fix', async () => {
+    comment = peanutButterComment;
     element.changeNum = 42 as NumericChangeId;
     element.patchNum = 1 as PatchSetNum;
     const commentEl = element.shadowRoot?.querySelector('gr-comment');
     assert.ok(commentEl);
     const promise = mockPromise();
-    commentEl!.addEventListener('create-fix-comment', () => {
-      const draft = addDraftServiceStub.firstCall.args[0];
+    commentEl!.addEventListener('create-fix-comment', async () => {
+      assert.isTrue(saveDiffDraftStub.called);
+      assert.isFalse(addDraftServiceStub.called);
+      saveDiffDraftPromiseResolver(mockResponse);
+      // flushing so the saveDiffDraftStub resolves and the draft is returned
+      await flush();
+      assert.isTrue(saveDiffDraftStub.called);
+      assert.isTrue(addDraftServiceStub.called);
+      const draft = saveDiffDraftStub.firstCall.args[2];
       assert.equal(
         draft.message,
         '> is this a crossover episode!?\n\nPlease fix.'
@@ -506,6 +549,8 @@
       assert.isTrue(draft.unresolved);
       promise.resolve();
     });
+    assert.isFalse(saveDiffDraftStub.called);
+    assert.isFalse(addDraftServiceStub.called);
     commentEl!.dispatchEvent(
       new CustomEvent('create-fix-comment', {
         detail: {comment: commentEl!.comment},
@@ -839,6 +884,7 @@
     stubRestApi('getLoggedIn').returns(Promise.resolve(false));
     stubRestApi('saveDiffDraft').returns(
       Promise.resolve({
+        ...new Response(),
         ok: true,
         text() {
           return Promise.resolve(
@@ -853,10 +899,10 @@
               })
           );
         },
-      } as unknown as Response)
+      })
     );
     stubRestApi('deleteDiffDraft').returns(
-      Promise.resolve({ok: true} as unknown as Response)
+      Promise.resolve({...new Response(), ok: true})
     );
     element = withCommentFixture.instantiate();
     element.patchNum = 1 as PatchSetNum;
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index 418cd0e..0d4ad8c 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -20,7 +20,6 @@
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import '../gr-button/gr-button';
 import '../gr-dialog/gr-dialog';
-import '../gr-date-formatter/gr-date-formatter';
 import '../gr-formatted-text/gr-formatted-text';
 import '../gr-icons/gr-icons';
 import '../gr-overlay/gr-overlay';
@@ -50,6 +49,7 @@
 import {GrConfirmDeleteCommentDialog} from '../gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog';
 import {
   isDraft,
+  isRobot,
   UIComment,
   UIDraft,
   UIRobot,
@@ -215,7 +215,7 @@
   projectConfig?: ConfigInfo;
 
   @property({type: Boolean})
-  robotButtonDisabled?: boolean;
+  robotButtonDisabled = false;
 
   @property({type: Boolean})
   _hasHumanReply?: boolean;
@@ -234,7 +234,7 @@
   side?: string;
 
   @property({type: Boolean})
-  resolved?: boolean;
+  resolved = false;
 
   // Intentional to share the object across instances.
   @property({type: Object})
@@ -319,12 +319,13 @@
     super.disconnectedCallback();
   }
 
-  _getAuthor(comment: UIComment) {
-    return comment.author || this._selfAccount;
+  /** 2nd argument is for *triggering* the computation only. */
+  _getAuthor(comment?: UIComment, _?: unknown) {
+    return comment?.author || this._selfAccount;
   }
 
-  _getUrlForComment(comment: UIComment) {
-    if (!this.changeNum || !this.projectName) return '';
+  _getUrlForComment(comment?: UIComment) {
+    if (!comment || !this.changeNum || !this.projectName) return '';
     if (!comment.id) throw new Error('comment must have an id');
     return GerritNav.getUrlForComment(
       this.changeNum as NumericChangeId,
@@ -436,8 +437,8 @@
     this._showRobotActions = showActions && isRobotComment;
   }
 
-  hasPublishedComment(comments: UIComment[]) {
-    if (!comments.length) return false;
+  hasPublishedComment(comments?: UIComment[]) {
+    if (!comments?.length) return false;
     return comments.length > 1 || !isDraft(comments[0]);
   }
 
@@ -675,7 +676,13 @@
 
   @observe('comment.message')
   _commentMessageChanged(message: string) {
-    this._messageText = message || '';
+    /*
+     * Only overwrite the message text user has typed if there is no existing
+     * text typed by the user. This prevents the bug where creating another
+     * comment triggered a recomputation of comments and the text written by
+     * the user was lost.
+     */
+    if (!this._messageText) this._messageText = message || '';
   }
 
   _messageTextChanged(_: string, oldValue: string) {
@@ -803,7 +810,7 @@
     );
   }
 
-  _hasNoFix(comment: UIComment) {
+  _hasNoFix(comment?: UIComment) {
     return !comment || !(comment as UIRobot).fix_suggestions;
   }
 
@@ -1032,9 +1039,10 @@
     return overlay.open();
   }
 
-  _computeHideRunDetails(comment: UIRobot, collapsed: boolean) {
+  _computeHideRunDetails(comment: UIComment | undefined, collapsed: boolean) {
     if (!comment) return true;
-    return !(comment.robot_id && comment.url && !collapsed);
+    if (!isRobot(comment)) return true;
+    return !comment.url || collapsed;
   }
 
   _closeOverlay(overlay?: GrOverlay | null) {
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
index b00bf8b..b77c4b2 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
@@ -89,10 +89,7 @@
       justify-content: flex-end;
     }
     .rightActions gr-button {
-      --gr-button: {
-        height: 20px;
-        padding: 0 var(--spacing-s);
-      }
+      --gr-button-padding: 0 var(--spacing-s);
     }
     .editMessage {
       display: none;
@@ -190,10 +187,8 @@
     }
     #deleteBtn {
       display: none;
-      --gr-button: {
-        color: var(--deemphasized-text-color);
-        padding: 0;
-      }
+      --gr-button-text-color: var(--deemphasized-text-color);
+      --gr-button-padding: 0;
     }
     #deleteBtn.showDeleteButtons {
       display: block;
@@ -275,10 +270,10 @@
         </template>
         <gr-tooltip-content
           class="draftTooltip"
-          has-tooltip=""
+          has-tooltip
           title="[[_computeDraftTooltip(_unableToSave)]]"
           max-width="20em"
-          show-icon=""
+          show-icon
         >
           <span class="draftLabel">[[_computeDraftText(_unableToSave)]]</span>
         </gr-tooltip-content>
@@ -313,7 +308,7 @@
       <template is="dom-if" if="[[comment.updated]]">
         <span class="date" tabindex="0" on-click="_handleAnchorClick">
           <gr-date-formatter
-            has-tooltip=""
+            withTooltip
             date-str="[[comment.updated]]"
           ></gr-date-formatter>
         </span>
@@ -321,7 +316,7 @@
       <div class="show-hide" tabindex="0">
         <label
           class="show-hide"
-          aria-label="[[_computeShowHideAriaLabel(collapsed)]]"
+          aria-label$="[[_computeShowHideAriaLabel(collapsed)]]"
         >
           <input
             type="checkbox"
@@ -357,7 +352,7 @@
           <div class="respectfulReviewTip">
             <div>
               <gr-tooltip-content
-                has-tooltip=""
+                has-tooltip
                 title="Tips for respectful code reviews."
               >
                 <iron-icon
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.ts
index 31a1614..b963d4b 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.ts
@@ -217,6 +217,29 @@
       assert.isTrue(storageStub.called);
     });
 
+    test('comment message sets messageText only when empty', () => {
+      element.changeNum = 1 as NumericChangeId;
+      element.patchNum = 1 as PatchSetNum;
+      element._messageText = '';
+      element.comment = {
+        author: {
+          name: 'Mr. Peanutbutter',
+          email: 'tenn1sballchaser@aol.com' as EmailAddress,
+        },
+        line: 5,
+        path: 'test',
+        __editing: true,
+        __draft: true,
+        message: 'hello world',
+      };
+      // messageText was empty so overwrite the message now
+      assert.equal(element._messageText, 'hello world');
+
+      element.comment!.message = 'new message';
+      // messageText was already set so do not overwrite it
+      assert.equal(element._messageText, 'hello world');
+    });
+
     test('_getPatchNum', () => {
       element.side = 'PARENT';
       element.patchNum = 1 as PatchSetNum;
diff --git a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts
index 2e95bd0..01422a9 100644
--- a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts
+++ b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts
@@ -81,35 +81,24 @@
         iron-icon {
           color: var(--deemphasized-text-color);
           vertical-align: top;
+          --iron-icon-height: 20px;
+          --iron-icon-width: 20px;
+        }
+        gr-button {
+          display: block;
+          --gr-button-padding: 2px;
         }
       `,
     ];
   }
 
   override render() {
-    // To pass CSS mixins for @apply to Polymer components, they need to appear
-    // in <style> inside the template.
-    const customStyle = html`
-      <style>
-        iron-icon {
-          --iron-icon-height: 20px;
-          --iron-icon-width: 20px;
-        }
-        gr-button {
-          --gr-button: {
-            padding: 2px;
-          }
-        }
-      </style>
-    `;
-    return html`${customStyle}
+    return html`
       <div class="text">
         <iron-input
           class="copyText"
-          type="text"
           @click="${this._handleInputClick}"
-          readonly=""
-          bind-value=${this.text}
+          .bindValue=${this.text ?? ''}
         >
           <input
             id="input"
@@ -118,22 +107,26 @@
             type="text"
             @click="${this._handleInputClick}"
             readonly=""
-            .value=${this.text}
+            .value=${this.text ?? ''}
             part="text-container-style"
           />
         </iron-input>
-        <gr-button
-          id="copy-clipboard-button"
-          link=""
+        <gr-tooltip-content
           ?has-tooltip=${this.hasTooltip}
-          class="copyToClipboard"
           title="${ifDefined(this.buttonTitle)}"
-          @click="${this._copyToClipboard}"
-          aria-label="Click to copy to clipboard"
         >
-          <iron-icon id="icon" icon="gr-icons:content-copy"></iron-icon>
-        </gr-button>
-      </div> `;
+          <gr-button
+            id="copy-clipboard-button"
+            link=""
+            class="copyToClipboard"
+            @click="${this._copyToClipboard}"
+            aria-label="Click to copy to clipboard"
+          >
+            <iron-icon id="icon" icon="gr-icons:content-copy"></iron-icon>
+          </gr-button>
+        </gr-tooltip-content>
+      </div>
+    `;
   }
 
   focusOnCopy() {
diff --git a/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.ts b/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.ts
index 9dce127..9f65dd4 100644
--- a/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.ts
+++ b/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.ts
@@ -179,9 +179,6 @@
   private async getVisibleEntries(
     filter?: (el: Element) => boolean
   ): Promise<IntersectionObserverEntry[]> {
-    if (!this._isIntersectionObserverSupported()) {
-      throw new Error('Intersection observing not supported');
-    }
     if (!this.stops) {
       return [];
     }
@@ -218,14 +215,6 @@
     });
   }
 
-  _isIntersectionObserverSupported() {
-    // The copy of this method exists in gr-app-element.js under the
-    // name _isCursorManagerSupportMoveToVisibleLine
-    // If you update this method, you must update gr-app-element.js
-    // as well.
-    return 'IntersectionObserver' in window;
-  }
-
   /**
    * Set the cursor to an arbitrary stop - if the given element is not one of
    * the stops, unset the cursor.
diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts
index a3800a8..99f9265 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts
@@ -14,11 +14,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../../styles/shared-styles';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-date-formatter_html';
-import {TooltipMixin} from '../../../mixins/gr-tooltip-mixin/gr-tooltip-mixin';
-import {property, customElement} from '@polymer/decorators';
+import '../gr-tooltip-content/gr-tooltip-content';
+import {css, html, LitElement} from 'lit';
+import {customElement, property} from 'lit/decorators';
 import {
   parseDate,
   fromNow,
@@ -75,17 +73,10 @@
   }
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = TooltipMixin(PolymerElement);
-
 @customElement('gr-date-formatter')
-export class GrDateFormatter extends base {
-  static get template() {
-    return htmlTemplate;
-  }
-
-  @property({type: String, notify: true})
-  dateStr: string | null = null;
+export class GrDateFormatter extends LitElement {
+  @property({type: String})
+  dateStr: string | undefined = undefined;
 
   @property({type: Boolean})
   showDateAndTime = false;
@@ -95,30 +86,20 @@
    * native browser tooltip.
    */
   @property({type: Boolean})
-  override hasTooltip = false;
+  withTooltip = false;
 
   @property({type: Boolean})
   showYesterday = false;
 
-  /**
-   * The title to be used as the native tooltip or by the tooltip behavior.
-   */
-  @property({
-    type: String,
-    reflectToAttribute: true,
-    computed: '_computeFullDateStr(dateStr, _timeFormat, _dateFormat)',
-  })
-  override title = '';
-
   /** @type {?{short: string, full: string}} */
   @property({type: Object})
-  _dateFormat?: DateFormatPair;
+  private dateFormat?: DateFormatPair;
 
   @property({type: String})
-  _timeFormat?: string;
+  private timeFormat?: string;
 
   @property({type: Boolean})
-  _relative = false;
+  private relative = false;
 
   @property({type: Boolean})
   forceRelative = false;
@@ -132,76 +113,110 @@
     super();
   }
 
+  static override get styles() {
+    return [
+      css`
+        host {
+          color: inherit;
+          display: inline;
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    if (!this.withTooltip) {
+      return this.renderDateString();
+    }
+
+    const fullDateStr = this.computeFullDateStr();
+    if (!fullDateStr) {
+      return this.renderDateString();
+    }
+    return html`
+      <gr-tooltip-content has-tooltip title=${fullDateStr}>
+        ${this.renderDateString()}
+      </gr-tooltip-content>
+    `;
+  }
+
+  private renderDateString() {
+    return html` <span>${this._computeDateStr()}</span>`;
+  }
+
   override connectedCallback() {
     super.connectedCallback();
     this._loadPreferences();
   }
 
+  // private but used by tests
   _getUtcOffsetString() {
     return utcOffsetString();
   }
 
+  // private but used by tests
   _loadPreferences() {
     return this._getLoggedIn().then(loggedIn => {
       if (!loggedIn) {
-        this._timeFormat = TimeFormats.TIME_24;
-        this._dateFormat = DateFormats.STD;
-        this._relative = this.forceRelative;
+        this.timeFormat = TimeFormats.TIME_24;
+        this.dateFormat = DateFormats.STD;
+        this.relative = this.forceRelative;
         return;
       }
-      return Promise.all([this._loadTimeFormat(), this._loadRelative()]);
+      return Promise.all([this._loadTimeFormat(), this.loadRelative()]);
     });
   }
 
+  // private but used in gr/file-list_test.js
   _loadTimeFormat() {
-    return this._getPreferences().then(preferences => {
+    return this.getPreferences().then(preferences => {
       if (!preferences) {
         throw Error('Preferences is not set');
       }
-      this._decideTimeFormat(preferences.time_format);
-      this._decideDateFormat(preferences.date_format);
+      this.decideTimeFormat(preferences.time_format);
+      this.decideDateFormat(preferences.date_format);
     });
   }
 
-  _decideTimeFormat(timeFormat: TimeFormat) {
+  private decideTimeFormat(timeFormat: TimeFormat) {
     switch (timeFormat) {
       case TimeFormat.HHMM_12:
-        this._timeFormat = TimeFormats.TIME_12;
+        this.timeFormat = TimeFormats.TIME_12;
         break;
       case TimeFormat.HHMM_24:
-        this._timeFormat = TimeFormats.TIME_24;
+        this.timeFormat = TimeFormats.TIME_24;
         break;
       default:
         assertNever(timeFormat, `Invalid time format: ${timeFormat}`);
     }
   }
 
-  _decideDateFormat(dateFormat: DateFormat) {
+  private decideDateFormat(dateFormat: DateFormat) {
     switch (dateFormat) {
       case DateFormat.STD:
-        this._dateFormat = DateFormats.STD;
+        this.dateFormat = DateFormats.STD;
         break;
       case DateFormat.US:
-        this._dateFormat = DateFormats.US;
+        this.dateFormat = DateFormats.US;
         break;
       case DateFormat.ISO:
-        this._dateFormat = DateFormats.ISO;
+        this.dateFormat = DateFormats.ISO;
         break;
       case DateFormat.EURO:
-        this._dateFormat = DateFormats.EURO;
+        this.dateFormat = DateFormats.EURO;
         break;
       case DateFormat.UK:
-        this._dateFormat = DateFormats.UK;
+        this.dateFormat = DateFormats.UK;
         break;
       default:
         assertNever(dateFormat, `Invalid date format: ${dateFormat}`);
     }
   }
 
-  _loadRelative() {
-    return this._getPreferences().then(prefs => {
+  private loadRelative() {
+    return this.getPreferences().then(prefs => {
       // prefs.relative_date_in_change_table is not set when false.
-      this._relative =
+      this.relative =
         this.forceRelative || !!(prefs && prefs.relative_date_in_change_table);
     });
   }
@@ -210,70 +225,60 @@
     return this.restApiService.getLoggedIn();
   }
 
-  _getPreferences() {
+  private getPreferences() {
     return this.restApiService.getPreferences();
   }
 
-  _computeDateStr(
-    dateStr?: Timestamp,
-    timeFormat?: string,
-    dateFormat?: DateFormatPair,
-    relative?: boolean,
-    showDateAndTime?: boolean,
-    showYesterday?: boolean
-  ) {
-    if (!dateStr || !timeFormat || !dateFormat) {
+  // private but used by tests
+  _computeDateStr() {
+    if (!this.dateStr || !this.timeFormat || !this.dateFormat) {
       return '';
     }
-    const date = parseDate(dateStr);
+    const date = parseDate(this.dateStr as Timestamp);
     if (!isValidDate(date)) {
       return '';
     }
-    if (relative) {
+    if (this.relative) {
       return fromNow(date, this.relativeOptionNoAgo);
     }
     const now = new Date();
-    let format = dateFormat.full;
+    let format = this.dateFormat.full;
     if (isWithinDay(now, date)) {
-      format = timeFormat;
-    } else if (showYesterday && wasYesterday(now, date)) {
-      return `Yesterday at ${formatDate(date, timeFormat)}`;
+      format = this.timeFormat;
+    } else if (this.showYesterday && wasYesterday(now, date)) {
+      return `Yesterday at ${formatDate(date, this.timeFormat)}`;
     } else {
       if (isWithinHalfYear(now, date)) {
-        format = dateFormat.short;
+        format = this.dateFormat.short;
       }
-      if (this.showDateAndTime || showDateAndTime) {
-        format = `${format} ${timeFormat}`;
+      if (this.showDateAndTime || this.showDateAndTime) {
+        format = `${format} ${this.timeFormat}`;
       }
     }
     return formatDate(date, format);
   }
 
-  _timeToSecondsFormat(timeFormat: string | undefined) {
-    return timeFormat === TimeFormats.TIME_12
-      ? TimeFormats.TIME_12_WITH_SEC
-      : TimeFormats.TIME_24_WITH_SEC;
-  }
-
-  _computeFullDateStr(
-    dateStr?: Timestamp,
-    timeFormat?: string,
-    dateFormat?: DateFormatPair
-  ) {
+  private computeFullDateStr() {
     // Polymer 2: check for undefined
-    if ([dateStr, timeFormat].includes(undefined) || !dateFormat) {
+    if (
+      [this.dateStr, this.timeFormat].includes(undefined) ||
+      !this.dateFormat
+    ) {
       return undefined;
     }
 
-    if (!dateStr) {
+    if (!this.dateStr) {
       return '';
     }
-    const date = parseDate(dateStr);
+    const date = parseDate(this.dateStr as Timestamp);
     if (!isValidDate(date)) {
       return '';
     }
-    let format = dateFormat.full + ', ';
-    format += this._timeToSecondsFormat(timeFormat);
+    let format = this.dateFormat.full + ', ';
+    format +=
+      this.timeFormat === TimeFormats.TIME_12
+        ? TimeFormats.TIME_12_WITH_SEC
+        : TimeFormats.TIME_24_WITH_SEC;
     return formatDate(date, format) + this._getUtcOffsetString();
   }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts
deleted file mode 100644
index 4808832..0000000
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_html.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style>
-    :host {
-      color: inherit;
-      display: inline;
-    }
-  </style>
-  <span>
-    [[_computeDateStr(dateStr, _timeFormat, _dateFormat, _relative,
-    showDateAndTime, showYesterday)]]
-  </span>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.js b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.js
index 9a96c2d..860a7e7 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.js
@@ -22,14 +22,18 @@
 import {stubRestApi} from '../../../test/test-utils.js';
 
 const basicFixture = fixtureFromTemplate(html`
-<gr-date-formatter date-str="2015-09-24 23:30:17.033000000"></gr-date-formatter>
+<gr-date-formatter withTooltip dateStr="2015-09-24 23:30:17.033000000">
+</gr-date-formatter>
+`);
+
+const lightFixture = fixtureFromTemplate(html`
+<gr-date-formatter dateStr="2015-09-24 23:30:17.033000000"></gr-date-formatter>
 `);
 
 suite('gr-date-formatter tests', () => {
   let element;
 
   setup(() => {
-
   });
 
   /**
@@ -41,7 +45,7 @@
     return d;
   }
 
-  function testDates(nowStr, dateStr, expected, expectedWithDateAndTime,
+  async function testDates(nowStr, dateStr, expected, expectedWithDateAndTime,
       expectedTooltip) {
     // Normalize and convert the date to mimic server response.
     dateStr = normalizedDate(dateStr)
@@ -50,13 +54,13 @@
         .slice(0, -1);
     sinon.useFakeTimers(normalizedDate(nowStr).getTime());
     element.dateStr = dateStr;
-    flush();
-    const span = element.shadowRoot
-        .querySelector('span');
+    await element.updateComplete;
+    const span = element.shadowRoot.querySelector('span');
+    const tooltip = element.shadowRoot.querySelector('gr-tooltip-content');
     assert.equal(span.textContent.trim(), expected);
-    assert.equal(element.title, expectedTooltip);
+    assert.equal(tooltip.title, expectedTooltip);
     element.showDateAndTime = true;
-    flush();
+    await element.updateComplete;
     assert.equal(span.textContent.trim(), expectedWithDateAndTime);
   }
 
@@ -81,35 +85,37 @@
 
     test('invalid dates are quietly rejected', () => {
       assert.notOk((new Date('foo')).valueOf());
-      assert.equal(element._computeDateStr('foo', 'h:mm A'), '');
+      element.dateStr = 'foo';
+      element.timeFormat = 'h:mm A';
+      assert.equal(element._computeDateStr(), '');
     });
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '15:34',
           '15:34',
           'Jul 29, 2015, 15:34:14');
     });
 
-    test('Within 24 hours on different days', () => {
-      testDates('2015-07-29 03:34:14.985000000',
+    test('Within 24 hours on different days', async () => {
+      await testDates('2015-07-29 03:34:14.985000000',
           '2015-07-28 20:25:14.985000000',
           'Jul 28',
           'Jul 28 20:25',
           'Jul 28, 2015, 20:25:14');
     });
 
-    test('More than 24 hours but less than six months', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('More than 24 hours but less than six months', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-06-15 03:25:14.985000000',
           'Jun 15',
           'Jun 15 03:25',
           'Jun 15, 2015, 03:25:14');
     });
 
-    test('More than six months', () => {
-      testDates('2015-09-15 20:34:00.000000000',
+    test('More than six months', async () => {
+      await testDates('2015-09-15 20:34:00.000000000',
           '2015-01-15 03:25:00.000000000',
           'Jan 15, 2015',
           'Jan 15, 2015 03:25',
@@ -128,24 +134,24 @@
       return element._loadPreferences();
     }));
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '15:34',
           '15:34',
           '07/29/15, 15:34:14');
     });
 
-    test('Within 24 hours on different days', () => {
-      testDates('2015-07-29 03:34:14.985000000',
+    test('Within 24 hours on different days', async () => {
+      await testDates('2015-07-29 03:34:14.985000000',
           '2015-07-28 20:25:14.985000000',
           '07/28',
           '07/28 20:25',
           '07/28/15, 20:25:14');
     });
 
-    test('More than 24 hours but less than six months', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('More than 24 hours but less than six months', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-06-15 03:25:14.985000000',
           '06/15',
           '06/15 03:25',
@@ -164,24 +170,24 @@
       return element._loadPreferences();
     }));
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '15:34',
           '15:34',
           '2015-07-29, 15:34:14');
     });
 
-    test('Within 24 hours on different days', () => {
-      testDates('2015-07-29 03:34:14.985000000',
+    test('Within 24 hours on different days', async () => {
+      await testDates('2015-07-29 03:34:14.985000000',
           '2015-07-28 20:25:14.985000000',
           '07-28',
           '07-28 20:25',
           '2015-07-28, 20:25:14');
     });
 
-    test('More than 24 hours but less than six months', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('More than 24 hours but less than six months', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-06-15 03:25:14.985000000',
           '06-15',
           '06-15 03:25',
@@ -200,24 +206,24 @@
       return element._loadPreferences();
     }));
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '15:34',
           '15:34',
           '29.07.2015, 15:34:14');
     });
 
-    test('Within 24 hours on different days', () => {
-      testDates('2015-07-29 03:34:14.985000000',
+    test('Within 24 hours on different days', async () => {
+      await testDates('2015-07-29 03:34:14.985000000',
           '2015-07-28 20:25:14.985000000',
           '28. Jul',
           '28. Jul 20:25',
           '28.07.2015, 20:25:14');
     });
 
-    test('More than 24 hours but less than six months', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('More than 24 hours but less than six months', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-06-15 03:25:14.985000000',
           '15. Jun',
           '15. Jun 03:25',
@@ -236,24 +242,24 @@
       return element._loadPreferences();
     }));
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '15:34',
           '15:34',
           '29/07/2015, 15:34:14');
     });
 
-    test('Within 24 hours on different days', () => {
-      testDates('2015-07-29 03:34:14.985000000',
+    test('Within 24 hours on different days', async () => {
+      await testDates('2015-07-29 03:34:14.985000000',
           '2015-07-28 20:25:14.985000000',
           '28/07',
           '28/07 20:25',
           '28/07/2015, 20:25:14');
     });
 
-    test('More than 24 hours but less than six months', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('More than 24 hours but less than six months', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-06-15 03:25:14.985000000',
           '15/06',
           '15/06 03:25',
@@ -273,8 +279,8 @@
       })
     );
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '3:34 PM',
           '3:34 PM',
@@ -294,8 +300,8 @@
       })
     );
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '3:34 PM',
           '3:34 PM',
@@ -315,8 +321,8 @@
       })
     );
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '3:34 PM',
           '3:34 PM',
@@ -336,8 +342,8 @@
       })
     );
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '3:34 PM',
           '3:34 PM',
@@ -357,8 +363,8 @@
       })
     );
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '3:34 PM',
           '3:34 PM',
@@ -377,16 +383,16 @@
       return element._loadPreferences();
     }));
 
-    test('Within 24 hours on same day', () => {
-      testDates('2015-07-29 20:34:14.985000000',
+    test('Within 24 hours on same day', async () => {
+      await testDates('2015-07-29 20:34:14.985000000',
           '2015-07-29 15:34:14.985000000',
           '5 hours ago',
           '5 hours ago',
           'Jul 29, 2015, 3:34:14 PM');
     });
 
-    test('More than six months', () => {
-      testDates('2015-09-15 20:34:00.000000000',
+    test('More than six months', async () => {
+      await testDates('2015-09-15 20:34:00.000000000',
           '2015-01-15 03:25:00.000000000',
           '8 months ago',
           '8 months ago',
@@ -405,10 +411,10 @@
     }));
 
     test('Preferences are respected', () => {
-      assert.equal(element._timeFormat, 'h:mm A');
-      assert.equal(element._dateFormat.short, 'MM/DD');
-      assert.equal(element._dateFormat.full, 'MM/DD/YY');
-      assert.isTrue(element._relative);
+      assert.equal(element.timeFormat, 'h:mm A');
+      assert.equal(element.dateFormat.short, 'MM/DD');
+      assert.equal(element.dateFormat.full, 'MM/DD/YY');
+      assert.isTrue(element.relative);
     });
   });
 
@@ -419,10 +425,38 @@
     }));
 
     test('Default preferences are respected', () => {
-      assert.equal(element._timeFormat, 'HH:mm');
-      assert.equal(element._dateFormat.short, 'MMM DD');
-      assert.equal(element._dateFormat.full, 'MMM DD, YYYY');
-      assert.isFalse(element._relative);
+      assert.equal(element.timeFormat, 'HH:mm');
+      assert.equal(element.dateFormat.short, 'MMM DD');
+      assert.equal(element.dateFormat.full, 'MMM DD, YYYY');
+      assert.isFalse(element.relative);
+    });
+  });
+
+  suite('with tooltip', () => {
+    setup(async () => {
+      await stubRestAPI(null);
+      element = basicFixture.instantiate();
+      await element._loadPreferences();
+      await element.updateComplete;
+    });
+
+    test('Tooltip is present', () => {
+      const tooltip = element.shadowRoot.querySelector('gr-tooltip-content');
+      assert.isOk(tooltip);
+    });
+  });
+
+  suite('without tooltip', () => {
+    setup(async () => {
+      await stubRestAPI(null);
+      element = lightFixture.instantiate();
+      await element._loadPreferences();
+      await element.updateComplete;
+    });
+
+    test('Tooltip is absent', () => {
+      const tooltip = element.shadowRoot.querySelector('gr-tooltip-content');
+      assert.isNotOk(tooltip);
     });
   });
 });
diff --git a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.ts b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.ts
index 27c6341..97ee39e 100644
--- a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.ts
@@ -15,13 +15,11 @@
  * limitations under the License.
  */
 import '../gr-button/gr-button';
-import '../../../styles/gr-font-styles';
-import '../../../styles/shared-styles';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-dialog_html';
-import {customElement, property, observe} from '@polymer/decorators';
+import {customElement, property, query} from 'lit/decorators';
 import {GrButton} from '../gr-button/gr-button';
-import {KeydownEvent} from '../../../types/events';
+import {css, html, LitElement, PropertyValues} from 'lit';
+import {sharedStyles} from '../../../styles/shared-styles';
+import {fontStyles} from '../../../styles/gr-font-styles';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -29,18 +27,8 @@
   }
 }
 
-export interface GrDialog {
-  $: {
-    confirm: GrButton;
-  };
-}
-
 @customElement('gr-dialog')
-export class GrDialog extends PolymerElement {
-  static get template() {
-    return htmlTemplate;
-  }
-
+export class GrDialog extends LitElement {
   /**
    * Fired when the confirm button is pressed.
    *
@@ -53,33 +41,132 @@
    * @event cancel
    */
 
-  @property({type: String})
+  @query('#confirm')
+  confirmButton?: GrButton;
+
+  @property({type: String, attribute: 'confirm-label'})
   confirmLabel = 'Confirm';
 
   // Supplying an empty cancel label will hide the button completely.
-  @property({type: String})
+  @property({type: String, attribute: 'cancel-label'})
   cancelLabel = 'Cancel';
 
   @property({type: Boolean})
   disabled = false;
 
-  @property({type: Boolean})
+  @property({type: Boolean, attribute: 'confirm-on-enter'})
   confirmOnEnter = false;
 
-  @property({type: String})
+  @property({type: String, attribute: 'confirm-tooltip'})
   confirmTooltip?: string;
 
-  override ready() {
-    super.ready();
-    this._ensureAttribute('role', 'dialog');
+  override firstUpdated(changedProperties: PropertyValues) {
+    super.firstUpdated(changedProperties);
+    if (!this.getAttribute('role')) this.setAttribute('role', 'dialog');
   }
 
-  @observe('confirmTooltip')
-  _handleConfirmTooltipUpdate(confirmTooltip?: string) {
-    if (confirmTooltip) {
-      this.$.confirm.setAttribute('has-tooltip', 'true');
+  static override get styles() {
+    return [
+      sharedStyles,
+      fontStyles,
+      css`
+        :host {
+          color: var(--primary-text-color);
+          display: block;
+          max-height: 90vh;
+          overflow: auto;
+        }
+        .container {
+          display: flex;
+          flex-direction: column;
+          max-height: 90vh;
+          padding: var(--spacing-xl);
+        }
+        header {
+          flex-shrink: 0;
+          padding-bottom: var(--spacing-xl);
+        }
+        main {
+          display: flex;
+          flex-shrink: 1;
+          width: 100%;
+          flex: 1;
+          /* IMPORTANT: required for firefox */
+          min-height: 0px;
+        }
+        main .overflow-container {
+          flex: 1;
+          overflow: auto;
+        }
+        footer {
+          display: flex;
+          flex-shrink: 0;
+          justify-content: flex-end;
+          padding-top: var(--spacing-xl);
+        }
+        gr-button {
+          margin-left: var(--spacing-l);
+        }
+        .hidden {
+          display: none;
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    // Note that we are using (e: Event) => this._handleKeyDown because the
+    // tests mock out _handleKeydown so the lookup needs to be dynamic, not
+    // bound statically here.
+    return html`
+      <div
+        class="container"
+        @keydown=${(e: KeyboardEvent) => this._handleKeydown(e)}
+      >
+        <header class="heading-3"><slot name="header"></slot></header>
+        <main>
+          <div class="overflow-container">
+            <slot name="main"></slot>
+          </div>
+        </main>
+        <footer>
+          <slot name="footer"></slot>
+          <gr-button
+            id="cancel"
+            class="${this.cancelLabel.length ? '' : 'hidden'}"
+            link
+            @click=${(e: Event) => this.handleCancelTap(e)}
+          >
+            ${this.cancelLabel}
+          </gr-button>
+          <gr-button
+            id="confirm"
+            link
+            primary
+            @click=${(e: Event) => this._handleConfirm(e)}
+            ?disabled=${this.disabled}
+            title=${this.confirmTooltip ?? ''}
+          >
+            ${this.confirmLabel}
+          </gr-button>
+        </footer>
+      </div>
+    `;
+  }
+
+  override updated(changedProperties: PropertyValues) {
+    if (changedProperties.has('confirmTooltip')) {
+      this.updateTooltip();
+    }
+  }
+
+  private updateTooltip() {
+    const confirmButton = this.confirmButton;
+    if (!confirmButton) return;
+    if (this.confirmTooltip) {
+      confirmButton.setAttribute('has-tooltip', 'true');
     } else {
-      this.$.confirm.removeAttribute('has-tooltip');
+      confirmButton.removeAttribute('has-tooltip');
     }
   }
 
@@ -98,7 +185,7 @@
     );
   }
 
-  _handleCancelTap(e: Event) {
+  private handleCancelTap(e: Event) {
     e.preventDefault();
     e.stopPropagation();
     this.dispatchEvent(
@@ -109,17 +196,13 @@
     );
   }
 
-  _handleKeydown(e: KeydownEvent) {
+  _handleKeydown(e: KeyboardEvent) {
     if (this.confirmOnEnter && e.keyCode === 13) {
       this._handleConfirm(e);
     }
   }
 
   resetFocus() {
-    this.$.confirm.focus();
-  }
-
-  _computeCancelClass(cancelLabel: string) {
-    return cancelLabel.length ? '' : 'hidden';
+    this.confirmButton!.focus();
   }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts
deleted file mode 100644
index a5cf8f1..0000000
--- a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_html.ts
+++ /dev/null
@@ -1,94 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-font-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="shared-styles">
-    :host {
-      color: var(--primary-text-color);
-      display: block;
-      max-height: 90vh;
-      overflow: auto;
-    }
-    .container {
-      display: flex;
-      flex-direction: column;
-      max-height: 90vh;
-      padding: var(--spacing-xl);
-    }
-    header {
-      flex-shrink: 0;
-      padding-bottom: var(--spacing-xl);
-    }
-    main {
-      display: flex;
-      flex-shrink: 1;
-      width: 100%;
-      flex: 1;
-      /* IMPORTANT: required for firefox */
-      min-height: 0px;
-    }
-    main .overflow-container {
-      flex: 1;
-      overflow: auto;
-    }
-    footer {
-      display: flex;
-      flex-shrink: 0;
-      justify-content: flex-end;
-      padding-top: var(--spacing-xl);
-    }
-    gr-button {
-      margin-left: var(--spacing-l);
-    }
-    .hidden {
-      display: none;
-    }
-  </style>
-  <div class="container" on-keydown="_handleKeydown">
-    <header class="heading-3"><slot name="header"></slot></header>
-    <main>
-      <div class="overflow-container">
-        <slot name="main"></slot>
-      </div>
-    </main>
-    <footer>
-      <slot name="footer"></slot>
-      <gr-button
-        id="cancel"
-        class$="[[_computeCancelClass(cancelLabel)]]"
-        link=""
-        on-click="_handleCancelTap"
-      >
-        [[cancelLabel]]
-      </gr-button>
-      <gr-button
-        id="confirm"
-        link=""
-        primary=""
-        on-click="_handleConfirm"
-        disabled="[[disabled]]"
-        title$="[[confirmTooltip]]"
-      >
-        [[confirmLabel]]
-      </gr-button>
-    </footer>
-  </div>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_test.ts b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_test.ts
index e7b7130..171fc6c 100644
--- a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog_test.ts
@@ -17,6 +17,7 @@
 
 import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
 import '../../../test/common-test-setup-karma';
+import './gr-dialog';
 import {GrDialog} from './gr-dialog';
 import {isHidden, queryAndAssert} from '../../../test/test-utils';
 
@@ -25,8 +26,9 @@
 suite('gr-dialog tests', () => {
   let element: GrDialog;
 
-  setup(() => {
+  setup(async () => {
     element = basicFixture.instantiate();
+    await element.updateComplete;
   });
 
   test('events', () => {
@@ -42,56 +44,59 @@
     assert.equal(cancel.callCount, 1);
   });
 
-  test('confirmOnEnter', () => {
+  test('confirmOnEnter', async () => {
     element.confirmOnEnter = false;
+    await element.updateComplete;
     const handleConfirmStub = sinon.stub(element, '_handleConfirm');
     const handleKeydownSpy = sinon.spy(element, '_handleKeydown');
-    MockInteractions.pressAndReleaseKeyOn(
+    MockInteractions.keyDownOn(
       queryAndAssert(element, 'main'),
       13,
       null,
       'enter'
     );
-    flush();
+    await flush();
 
     assert.isTrue(handleKeydownSpy.called);
     assert.isFalse(handleConfirmStub.called);
 
     element.confirmOnEnter = true;
-    MockInteractions.pressAndReleaseKeyOn(
+    await element.updateComplete;
+
+    MockInteractions.keyDownOn(
       queryAndAssert(element, 'main'),
       13,
       null,
       'enter'
     );
-    flush();
+    await flush();
 
     assert.isTrue(handleConfirmStub.called);
   });
 
   test('resetFocus', () => {
-    const focusStub = sinon.stub(element.$.confirm, 'focus');
+    const focusStub = sinon.stub(element.confirmButton!, 'focus');
     element.resetFocus();
     assert.isTrue(focusStub.calledOnce);
   });
 
   suite('tooltip', () => {
     test('tooltip not added by default', () => {
-      assert.isNull(element.$.confirm.getAttribute('has-tooltip'));
+      assert.isNull(element.confirmButton!.getAttribute('has-tooltip'));
     });
 
-    test('tooltip added if confirm tooltip is passed', () => {
+    test('tooltip added if confirm tooltip is passed', async () => {
       element.confirmTooltip = 'confirm tooltip';
-      flush();
-      assert(element.$.confirm.getAttribute('has-tooltip'));
+      await element.updateComplete;
+      assert(element.confirmButton!.getAttribute('has-tooltip'));
     });
   });
 
-  test('empty cancel label hides cancel btn', () => {
+  test('empty cancel label hides cancel btn', async () => {
     const cancelButton = queryAndAssert(element, '#cancel');
     assert.isFalse(isHidden(cancelButton));
     element.cancelLabel = '';
-    flush();
+    await element.updateComplete;
 
     assert.isTrue(isHidden(cancelButton));
   });
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts
index ef46cec..6180f35 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts
@@ -88,7 +88,7 @@
   disabled = false;
 
   @property({type: String, notify: true})
-  value?: string;
+  value: string | number = '';
 
   @property({type: Boolean})
   showCopyForTriggerText = false;
@@ -122,6 +122,10 @@
     return item.mobileText ? item.mobileText : item.text;
   }
 
+  computeStringValue(val: string | number) {
+    return String(val);
+  }
+
   @observe('value', 'items')
   _handleValueChange(value?: string, items?: DropdownItem[]) {
     if (!value || !items) {
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
index 18a46a0..3875871 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
@@ -78,9 +78,8 @@
       width: 100%;
     }
     gr-button {
-      --gr-button: {
-        @apply --trigger-style;
-      }
+      font-family: var(--trigger-style-font-family);
+      --gr-button-text-color: var(--trigger-style-text-color);
     }
     gr-date-formatter {
       color: var(--deemphasized-text-color);
@@ -123,6 +122,7 @@
     class="dropdown-trigger"
     on-click="_showDropdownTapHandler"
     slot="dropdown-trigger"
+    no-uppercase
   >
     <span id="triggerText">[[text]]</span>
     <gr-copy-clipboard
@@ -173,7 +173,10 @@
   <gr-select bind-value="{{value}}">
     <select>
       <template is="dom-repeat" items="[[items]]">
-        <option disabled$="[[item.disabled]]" value="[[item.value]]">
+        <option
+          disabled$="[[item.disabled]]"
+          value="[[computeStringValue(item.value)]]"
+        >
           [[_computeMobileText(item)]]
         </option>
       </template>
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
index 4bd98d6..3c07d94 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
@@ -33,7 +33,6 @@
     }
     gr-button {
       vertical-align: top;
-      @apply --gr-button;
     }
     gr-avatar {
       height: 2em;
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts
index bd1046f..13b195e 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts
@@ -26,12 +26,11 @@
 import {IronDropdownElement} from '@polymer/iron-dropdown/iron-dropdown';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {PaperInputElementExt} from '../../../types/types';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 import {
   AutocompleteQuery,
   GrAutocomplete,
 } from '../gr-autocomplete/gr-autocomplete';
-import {getKeyboardEvent} from '../../../utils/dom-util';
 
 const AWAIT_MAX_ITERS = 10;
 const AWAIT_STEP = 5;
@@ -205,8 +204,8 @@
       this.getGrAutocomplete()) as HTMLInputElement;
   }
 
-  _handleEnter(e: CustomKeyboardEvent) {
-    e = getKeyboardEvent(e);
+  _handleEnter(event: IronKeyboardEvent) {
+    const e = event.detail.keyboardEvent;
     const target = (dom(e) as EventApi).rootTarget;
     if (target === this._nativeInput) {
       e.preventDefault();
@@ -214,8 +213,8 @@
     }
   }
 
-  _handleEsc(e: CustomKeyboardEvent) {
-    e = getKeyboardEvent(e);
+  _handleEsc(event: IronKeyboardEvent) {
+    const e = event.detail.keyboardEvent;
     const target = (dom(e) as EventApi).rootTarget;
     if (target === this._nativeInput) {
       e.preventDefault();
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
index c303bed..e711e9d 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
@@ -72,7 +72,7 @@
       --iron-icon-width: 18px;
     }
     gr-button.pencil {
-      --padding: 0px 0px;
+      --gr-button-padding: 0px 0px;
     }
   </style>
   <template is="dom-if" if="[[!showAsEditPencil]]">
diff --git a/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts
index 0f94b11..3f759b5 100644
--- a/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts
+++ b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts
@@ -36,7 +36,7 @@
   @property({type: Object})
   file?: NormalizedFileInfo;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
@@ -65,7 +65,7 @@
     ];
   }
 
-  render() {
+  override render() {
     return html` <span
       class="${this._computeStatusClass(this.file)}"
       tabindex="0"
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
index a329736..6a34fbb 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
@@ -16,16 +16,11 @@
  */
 
 import '@polymer/iron-icon/iron-icon';
-import '../../../styles/gr-font-styles';
-import '../../../styles/shared-styles';
 import '../gr-avatar/gr-avatar';
 import '../gr-button/gr-button';
-import {HovercardBehaviorMixin} from '../gr-hovercard/gr-hovercard-behavior';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-hovercard-account_html';
 import {appContext} from '../../../services/app-context';
 import {accountKey, isSelf} from '../../../utils/account-util';
-import {customElement, property} from '@polymer/decorators';
+import {customElement, property} from 'lit/decorators';
 import {
   AccountInfo,
   ChangeInfo,
@@ -45,16 +40,15 @@
 import {CURRENT} from '../../../utils/patch-set-util';
 import {isInvolved, isRemovableReviewer} from '../../../utils/change-util';
 import {assertIsDefined} from '../../../utils/common-util';
+import {fontStyles} from '../../../styles/gr-font-styles';
+import {css, html, LitElement} from 'lit';
+import {HovercardMixin} from '../../../mixins/hovercard-mixin/hovercard-mixin';
 
 // This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = HovercardBehaviorMixin(PolymerElement);
+const base = HovercardMixin(LitElement);
 
 @customElement('gr-hovercard-account')
 export class GrHovercardAccount extends base {
-  static get template() {
-    return htmlTemplate;
-  }
-
   @property({type: Object})
   account!: AccountInfo;
 
@@ -96,7 +90,7 @@
     this.reporting = appContext.reportingService;
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     this.restApiService.getConfig().then(config => {
       this._config = config;
@@ -106,9 +100,214 @@
     });
   }
 
-  _computeText(account?: AccountInfo, selfAccount?: AccountInfo) {
-    if (!account || !selfAccount) return '';
-    return isSelf(account, selfAccount) ? 'Your' : 'Their';
+  static override get styles() {
+    return [
+      fontStyles,
+      base.styles || [],
+      css`
+        .top,
+        .attention,
+        .status,
+        .voteable {
+          padding: var(--spacing-s) var(--spacing-l);
+        }
+        .top {
+          display: flex;
+          padding-top: var(--spacing-xl);
+          min-width: 300px;
+        }
+        gr-avatar {
+          height: 48px;
+          width: 48px;
+          margin-right: var(--spacing-l);
+        }
+        .title,
+        .email {
+          color: var(--deemphasized-text-color);
+        }
+        .action {
+          border-top: 1px solid var(--border-color);
+          padding: var(--spacing-s) var(--spacing-l);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
+        }
+        .attention {
+          background-color: var(--emphasis-color);
+        }
+        .attention a {
+          text-decoration: none;
+        }
+        iron-icon {
+          vertical-align: top;
+        }
+        .status iron-icon {
+          width: 14px;
+          height: 14px;
+          position: relative;
+          top: 2px;
+        }
+        iron-icon.attentionIcon {
+          width: 14px;
+          height: 14px;
+          position: relative;
+          top: 3px;
+        }
+        .reason {
+          padding-top: var(--spacing-s);
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    return html`
+      <div id="container" role="tooltip" tabindex="-1">
+        ${this.renderContent()}
+      </div>
+    `;
+  }
+
+  private renderContent() {
+    if (!this._isShowing) return;
+    return html`
+      <div class="top">
+        <div class="avatar">
+          <gr-avautar .account=${this.account} imageSize="56"></gr-avatar>
+        </div>
+        <div class="account">
+          <h3 class="name heading-3">${this.account.name}</h3>
+          <div class="email">${this.account.email}</div>
+        </div>
+      </div>
+      ${this.renderAccountStatus()}
+      ${
+        this.voteableText
+          ? html`
+              <div class="voteable">
+                <span class="title">Voteable:</span>
+                <span class="value">${this.voteableText}</span>
+              </div>
+            `
+          : ''
+      }
+      ${this.renderNeedsAttention()} ${this.renderAddToAttention()}
+      ${this.renderRemoveFromAttention()} ${this.renderReviewerOrCcActions()}
+    `;
+  }
+
+  private renderReviewerOrCcActions() {
+    if (!this._selfAccount || !isRemovableReviewer(this.change, this.account))
+      return;
+    return html`
+      <div class="action">
+        <gr-button
+          class="removeReviewerOrCC"
+          link=""
+          no-uppercase
+          @click="${this.handleRemoveReviewerOrCC}"
+        >
+          Remove ${this.computeReviewerOrCCText()}
+        </gr-button>
+      </div>
+      <div class="action">
+        <gr-button
+          class="changeReviewerOrCC"
+          link=""
+          no-uppercase
+          @click="${this.handleChangeReviewerOrCCStatus}"
+        >
+          ${this.computeChangeReviewerOrCCText()}
+        </gr-button>
+      </div>
+    `;
+  }
+
+  private renderAccountStatus() {
+    if (!this.account.status) return;
+    return html`
+      <div class="status">
+        <span class="title">
+          <iron-icon icon="gr-icons:calendar"></iron-icon>
+          Status:
+        </span>
+        <span class="value">${this.account.status}</span>
+      </div>
+    `;
+  }
+
+  private renderNeedsAttention() {
+    if (!(this.isAttentionEnabled && this.hasUserAttention)) return;
+    const lastUpdate = getLastUpdate(this.account, this.change);
+    return html`
+      <div class="attention">
+        <div>
+          <iron-icon
+            class="attentionIcon"
+            icon="gr-icons:attention"
+          ></iron-icon>
+          <span> ${this.computePronoun()} turn to take this action. </span>
+          <a
+            href="https://gerrit-review.googlesource.com/Documentation/user-attention-set.html"
+            target="_blank"
+          >
+            <iron-icon
+              icon="gr-icons:help-outline"
+              title="read documentation"
+            ></iron-icon>
+          </a>
+        </div>
+        <div class="reason">
+          <span class="title">Reason:</span>
+          <span class="value">
+            ${getReason(this._config, this.account, this.change)}
+          </span>
+          ${lastUpdate
+            ? html` (<gr-date-formatter
+                  withTooltip
+                  .dateStr="${lastUpdate}"
+                ></gr-date-formatter
+                >)`
+            : ''}
+        </div>
+      </div>
+    `;
+  }
+
+  private renderAddToAttention() {
+    if (!this.computeShowActionAddToAttentionSet()) return;
+    return html`
+      <div class="action">
+        <gr-button
+          class="addToAttentionSet"
+          link=""
+          no-uppercase
+          @click="${this.handleClickAddToAttentionSet}"
+        >
+          Add to attention set
+        </gr-button>
+      </div>
+    `;
+  }
+
+  private renderRemoveFromAttention() {
+    if (!this.computeShowActionRemoveFromAttentionSet()) return;
+    return html`
+      <div class="action">
+        <gr-button
+          class="removeFromAttentionSet"
+          link=""
+          no-uppercase
+          @click="${this.handleClickRemoveFromAttentionSet}"
+        >
+          Remove from attention set
+        </gr-button>
+      </div>
+    `;
+  }
+
+  // private but used by tests
+  computePronoun() {
+    if (!this.account || !this._selfAccount) return '';
+    return isSelf(this.account, this._selfAccount) ? 'Your' : 'Their';
   }
 
   get isAttentionEnabled() {
@@ -123,22 +322,11 @@
     return hasAttention(this.account, this.change);
   }
 
-  _computeReason(change?: ChangeInfo) {
-    return getReason(this._config, this.account, change);
-  }
-
-  _computeLastUpdate(change?: ChangeInfo) {
-    return getLastUpdate(this.account, change);
-  }
-
-  _showReviewerOrCCActions(account?: AccountInfo, change?: ChangeInfo) {
-    return !!this._selfAccount && isRemovableReviewer(change, account);
-  }
-
-  _getReviewerState(account: AccountInfo, change: ChangeInfo) {
+  private getReviewerState() {
     if (
-      change.reviewers[ReviewerState.REVIEWER]?.some(
-        (reviewer: AccountInfo) => reviewer._account_id === account._account_id
+      this.change!.reviewers[ReviewerState.REVIEWER]?.some(
+        (reviewer: AccountInfo) =>
+          reviewer._account_id === this.account._account_id
       )
     ) {
       return ReviewerState.REVIEWER;
@@ -146,21 +334,21 @@
     return ReviewerState.CC;
   }
 
-  _computeReviewerOrCCText(account?: AccountInfo, change?: ChangeInfo) {
-    if (!change || !account) return '';
-    return this._getReviewerState(account, change) === ReviewerState.REVIEWER
+  private computeReviewerOrCCText() {
+    if (!this.change || !this.account) return '';
+    return this.getReviewerState() === ReviewerState.REVIEWER
       ? 'Reviewer'
       : 'CC';
   }
 
-  _computeChangeReviewerOrCCText(account?: AccountInfo, change?: ChangeInfo) {
-    if (!change || !account) return '';
-    return this._getReviewerState(account, change) === ReviewerState.REVIEWER
+  private computeChangeReviewerOrCCText() {
+    if (!this.change || !this.account) return '';
+    return this.getReviewerState() === ReviewerState.REVIEWER
       ? 'Move Reviewer to CC'
       : 'Move CC to Reviewer';
   }
 
-  _handleChangeReviewerOrCCStatus() {
+  private handleChangeReviewerOrCCStatus() {
     assertIsDefined(this.change, 'change');
     // accountKey() throws an error if _account_id & email is not found, which
     // we want to check before showing reloading toast
@@ -173,7 +361,7 @@
       {
         reviewer: _accountKey,
         state:
-          this._getReviewerState(this.account, this.change) === ReviewerState.CC
+          this.getReviewerState() === ReviewerState.CC
             ? ReviewerState.REVIEWER
             : ReviewerState.CC,
       },
@@ -184,15 +372,14 @@
       .then(response => {
         if (!response || !response.ok) {
           throw new Error(
-            'something went wrong when toggling' +
-              this._getReviewerState(this.account, this.change!)
+            'something went wrong when toggling' + this.getReviewerState()
           );
         }
         this.dispatchEventThroughTarget('reload', {clearPatchset: true});
       });
   }
 
-  _handleRemoveReviewerOrCC() {
+  private handleRemoveReviewerOrCC() {
     if (!this.change || !(this.account?._account_id || this.account?.email))
       throw new Error('Missing change or account.');
     this.dispatchEventThroughTarget('show-alert', {
@@ -212,25 +399,21 @@
       });
   }
 
-  _computeShowLabelNeedsAttention() {
-    return this.isAttentionEnabled && this.hasUserAttention;
-  }
-
-  _computeShowActionAddToAttentionSet() {
+  private computeShowActionAddToAttentionSet() {
     const involvedOrSelf =
       isInvolved(this.change, this._selfAccount) ||
       isSelf(this.account, this._selfAccount);
     return involvedOrSelf && this.isAttentionEnabled && !this.hasUserAttention;
   }
 
-  _computeShowActionRemoveFromAttentionSet() {
+  private computeShowActionRemoveFromAttentionSet() {
     const involvedOrSelf =
       isInvolved(this.change, this._selfAccount) ||
       isSelf(this.account, this._selfAccount);
     return involvedOrSelf && this.isAttentionEnabled && this.hasUserAttention;
   }
 
-  _handleClickAddToAttentionSet() {
+  private handleClickAddToAttentionSet(e: MouseEvent) {
     if (!this.change || !this.account._account_id) return;
     this.dispatchEventThroughTarget('show-alert', {
       message: 'Saving attention set update ...',
@@ -251,17 +434,17 @@
 
     this.reporting.reportInteraction(
       'attention-hovercard-add',
-      this._reportingDetails()
+      this.reportingDetails()
     );
     this.restApiService
       .addToAttentionSet(this.change._number, this.account._account_id, reason)
       .then(() => {
         this.dispatchEventThroughTarget('hide-alert');
       });
-    this.hide();
+    this.hide(e);
   }
 
-  _handleClickRemoveFromAttentionSet() {
+  private handleClickRemoveFromAttentionSet(e: MouseEvent) {
     if (!this.change || !this.account._account_id) return;
     this.dispatchEventThroughTarget('show-alert', {
       message: 'Saving attention set update ...',
@@ -278,7 +461,7 @@
 
     this.reporting.reportInteraction(
       'attention-hovercard-remove',
-      this._reportingDetails()
+      this.reportingDetails()
     );
     this.restApiService
       .removeFromAttentionSet(
@@ -289,10 +472,10 @@
       .then(() => {
         this.dispatchEventThroughTarget('hide-alert');
       });
-    this.hide();
+    this.hide(e);
   }
 
-  _reportingDetails() {
+  private reportingDetails() {
     const targetId = this.account._account_id;
     const ownerId =
       (this.change && this.change.owner && this.change.owner._account_id) || -1;
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
deleted file mode 100644
index f1f6bf8..0000000
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
+++ /dev/null
@@ -1,196 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import '../gr-hovercard/gr-hovercard-shared-style';
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-font-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="gr-hovercard-shared-style">
-    .top,
-    .attention,
-    .status,
-    .voteable {
-      padding: var(--spacing-s) var(--spacing-l);
-    }
-    .top {
-      display: flex;
-      padding-top: var(--spacing-xl);
-      min-width: 300px;
-    }
-    gr-avatar {
-      height: 48px;
-      width: 48px;
-      margin-right: var(--spacing-l);
-    }
-    .title,
-    .email {
-      color: var(--deemphasized-text-color);
-    }
-    .action {
-      border-top: 1px solid var(--border-color);
-      padding: var(--spacing-s) var(--spacing-l);
-      --gr-button: {
-        padding: var(--spacing-s) var(--spacing-m);
-      }
-    }
-    .attention {
-      background-color: var(--emphasis-color);
-    }
-    .attention a {
-      text-decoration: none;
-    }
-    iron-icon {
-      vertical-align: top;
-    }
-    .status iron-icon {
-      width: 14px;
-      height: 14px;
-      position: relative;
-      top: 2px;
-    }
-    iron-icon.attentionIcon {
-      width: 14px;
-      height: 14px;
-      position: relative;
-      top: 3px;
-    }
-    .reason {
-      padding-top: var(--spacing-s);
-    }
-  </style>
-  <div id="container" role="tooltip" tabindex="-1">
-    <template is="dom-if" if="[[_isShowing]]">
-      <div class="top">
-        <div class="avatar">
-          <gr-avatar account="[[account]]" imageSize="56"></gr-avatar>
-        </div>
-        <div class="account">
-          <h3 class="name heading-3">[[account.name]]</h3>
-          <div class="email">[[account.email]]</div>
-        </div>
-      </div>
-      <template is="dom-if" if="[[account.status]]">
-        <div class="status">
-          <span class="title">
-            <iron-icon icon="gr-icons:calendar"></iron-icon>
-            Status:
-          </span>
-          <span class="value">[[account.status]]</span>
-        </div>
-      </template>
-      <template is="dom-if" if="[[voteableText]]">
-        <div class="voteable">
-          <span class="title">Voteable:</span>
-          <span class="value">[[voteableText]]</span>
-        </div>
-      </template>
-      <template
-        is="dom-if"
-        if="[[_computeShowLabelNeedsAttention(_config, highlightAttention, account, change)]]"
-      >
-        <div class="attention">
-          <div>
-            <iron-icon
-              class="attentionIcon"
-              icon="gr-icons:attention"
-            ></iron-icon>
-            <span>
-              [[_computeText(account, _selfAccount)]] turn to take action.
-            </span>
-            <a
-              href="https://gerrit-review.googlesource.com/Documentation/user-attention-set.html"
-              target="_blank"
-            >
-              <iron-icon
-                icon="gr-icons:help-outline"
-                title="read documentation"
-              ></iron-icon>
-            </a>
-          </div>
-          <div class="reason">
-            <span class="title">Reason:</span>
-            <span class="value">[[_computeReason(change)]]</span>
-            <template is="dom-if" if="[[_computeLastUpdate(change)]]">
-              (<gr-date-formatter
-                has-tooltip
-                date-str="[[_computeLastUpdate(change)]]"
-              ></gr-date-formatter
-              >)
-            </template>
-          </div>
-        </div>
-      </template>
-      <template
-        is="dom-if"
-        if="[[_computeShowActionAddToAttentionSet(_config, highlightAttention, account, change, _selfAccount)]]"
-      >
-        <div class="action">
-          <gr-button
-            class="addToAttentionSet"
-            link=""
-            no-uppercase=""
-            on-click="_handleClickAddToAttentionSet"
-          >
-            Add to attention set
-          </gr-button>
-        </div>
-      </template>
-      <template
-        is="dom-if"
-        if="[[_computeShowActionRemoveFromAttentionSet(_config, highlightAttention, account, change, _selfAccount)]]"
-      >
-        <div class="action">
-          <gr-button
-            class="removeFromAttentionSet"
-            link=""
-            no-uppercase=""
-            on-click="_handleClickRemoveFromAttentionSet"
-          >
-            Remove from attention set
-          </gr-button>
-        </div>
-      </template>
-      <template
-        is="dom-if"
-        if="[[_showReviewerOrCCActions(account, change, _selfAccount)]]"
-      >
-        <div class="action">
-          <gr-button
-            class="removeReviewerOrCC"
-            link=""
-            no-uppercase=""
-            on-click="_handleRemoveReviewerOrCC"
-          >
-            Remove [[_computeReviewerOrCCText(account, change)]]
-          </gr-button>
-        </div>
-        <div class="action">
-          <gr-button
-            class="changeReviewerOrCC"
-            link=""
-            no-uppercase=""
-            on-click="_handleChangeReviewerOrCCStatus"
-          >
-            [[_computeChangeReviewerOrCCText(account, change)]]
-          </gr-button>
-        </div>
-      </template>
-    </template>
-  </div>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_test.js b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_test.js
index e9a224c..5530d7c 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_test.js
@@ -19,7 +19,7 @@
 import './gr-hovercard-account.js';
 import {html} from '@polymer/polymer/lib/utils/html-tag.js';
 import {ReviewerState} from '../../../constants/constants.js';
-import {stubRestApi} from '../../../test/test-utils.js';
+import {mockPromise, stubRestApi} from '../../../test/test-utils.js';
 
 const basicFixture = fixtureFromTemplate(html`
 <gr-hovercard-account class="hovered"></gr-hovercard-account>
@@ -57,33 +57,21 @@
         'Kermit The Frog');
   });
 
-  test('_computeLastUpdate', () => {
-    const last_update = '2019-07-17 19:39:02.000000000';
-    const change = {
-      attention_set: {
-        31415926535: {
-          last_update,
-        },
-      },
-    };
-    assert.equal(element._computeLastUpdate(change), last_update);
-  });
-
-  test('_computeText', () => {
-    let account = {_account_id: '1'};
-    const selfAccount = {_account_id: '1'};
-    assert.equal(element._computeText(account, selfAccount), 'Your');
-    account = {_account_id: '2'};
-    assert.equal(element._computeText(account, selfAccount), 'Their');
+  test('computePronoun', () => {
+    element.account = {_account_id: '1'};
+    element._selfAccount = {_account_id: '1'};
+    assert.equal(element.computePronoun(), 'Your');
+    element.account = {_account_id: '2'};
+    assert.equal(element.computePronoun(), 'Their');
   });
 
   test('account status is not shown if the property is not set', () => {
     assert.isNull(element.shadowRoot.querySelector('.status'));
   });
 
-  test('account status is displayed', () => {
+  test('account status is displayed', async () => {
     element.account = {status: 'OOO', ...ACCOUNT};
-    flush();
+    await element.updateComplete;
     assert.equal(element.shadowRoot.querySelector('.status .value').innerText,
         'OOO');
   });
@@ -92,9 +80,9 @@
     assert.isNull(element.shadowRoot.querySelector('.voteable'));
   });
 
-  test('voteable div is displayed', () => {
+  test('voteable div is displayed', async () => {
     element.voteableText = 'CodeReview: +2';
-    flush();
+    await element.updateComplete;
     assert.equal(element.shadowRoot.querySelector('.voteable .value').innerText,
         element.voteableText);
   });
@@ -106,15 +94,15 @@
         [ReviewerState.REVIEWER]: [ACCOUNT],
       },
     };
+    await element.updateComplete;
     stubRestApi('removeChangeReviewer').returns(Promise.resolve({ok: true}));
     const reloadListener = sinon.spy();
     element._target.addEventListener('reload', reloadListener);
-    flush();
     const button = element.shadowRoot.querySelector('.removeReviewerOrCC');
     assert.isOk(button);
     assert.equal(button.innerText, 'Remove Reviewer');
     MockInteractions.tap(button);
-    await flush();
+    await element.updateComplete;
     assert.isTrue(reloadListener.called);
   });
 
@@ -125,6 +113,7 @@
         [ReviewerState.REVIEWER]: [ACCOUNT],
       },
     };
+    await element.updateComplete;
     const saveReviewStub = stubRestApi(
         'saveChangeReview').returns(
         Promise.resolve({ok: true}));
@@ -132,14 +121,12 @@
     const reloadListener = sinon.spy();
     element._target.addEventListener('reload', reloadListener);
 
-    flush();
     const button = element.shadowRoot.querySelector('.changeReviewerOrCC');
 
     assert.isOk(button);
     assert.equal(button.innerText, 'Move Reviewer to CC');
     MockInteractions.tap(button);
-    await flush();
-
+    await element.updateComplete;
     assert.isTrue(saveReviewStub.called);
     assert.isTrue(reloadListener.called);
   });
@@ -151,20 +138,19 @@
         [ReviewerState.REVIEWER]: [],
       },
     };
+    await element.updateComplete;
     const saveReviewStub = stubRestApi(
         'saveChangeReview').returns(Promise.resolve({ok: true}));
     stubRestApi('removeChangeReviewer').returns(Promise.resolve({ok: true}));
     const reloadListener = sinon.spy();
     element._target.addEventListener('reload', reloadListener);
-    flush();
 
     const button = element.shadowRoot.querySelector('.changeReviewerOrCC');
     assert.isOk(button);
     assert.equal(button.innerText, 'Move CC to Reviewer');
 
     MockInteractions.tap(button);
-    await flush();
-
+    await element.updateComplete;
     assert.isTrue(saveReviewStub.called);
     assert.isTrue(reloadListener.called);
   });
@@ -176,31 +162,26 @@
         [ReviewerState.REVIEWER]: [],
       },
     };
+    await element.updateComplete;
     stubRestApi('removeChangeReviewer').returns(Promise.resolve({ok: true}));
     const reloadListener = sinon.spy();
     element._target.addEventListener('reload', reloadListener);
 
-    flush();
     const button = element.shadowRoot.querySelector('.removeReviewerOrCC');
 
     assert.equal(button.innerText, 'Remove CC');
     assert.isOk(button);
     MockInteractions.tap(button);
-
-    await flush();
-
+    await element.updateComplete;
     assert.isTrue(reloadListener.called);
   });
 
   test('add to attention set', async () => {
-    let apiResolve;
-    const apiPromise = new Promise(r => {
-      apiResolve = r;
-    });
+    const apiPromise = mockPromise();
     const apiSpy = stubRestApi('addToAttentionSet').returns(apiPromise);
     element.highlightAttention = true;
     element._target = document.createElement('div');
-    flush();
+    await element.updateComplete;
     const showAlertListener = sinon.spy();
     const hideAlertListener = sinon.spy();
     const updatedListener = sinon.spy();
@@ -224,8 +205,8 @@
     assert.isTrue(updatedListener.called, 'updatedListener was called');
     assert.isFalse(element._isShowing, 'hovercard is hidden');
 
-    apiResolve({});
-    await flush();
+    apiPromise.resolve({});
+    await element.updateComplete;
     assert.isTrue(apiSpy.calledOnce);
     assert.equal(apiSpy.lastCall.args[2],
         `Added by <GERRIT_ACCOUNT_${ACCOUNT._account_id}>`
@@ -234,10 +215,7 @@
   });
 
   test('remove from attention set', async () => {
-    let apiResolve;
-    const apiPromise = new Promise(r => {
-      apiResolve = r;
-    });
+    const apiPromise = mockPromise();
     const apiSpy = stubRestApi('removeFromAttentionSet').returns(apiPromise);
     element.highlightAttention = true;
     element.change = {
@@ -246,7 +224,7 @@
       owner: {...ACCOUNT},
     };
     element._target = document.createElement('div');
-    flush();
+    await element.updateComplete;
     const showAlertListener = sinon.spy();
     const hideAlertListener = sinon.spy();
     const updatedListener = sinon.spy();
@@ -264,8 +242,8 @@
     assert.isTrue(updatedListener.called, 'updatedListener was called');
     assert.isFalse(element._isShowing, 'hovercard is hidden');
 
-    apiResolve({});
-    await flush();
+    apiPromise.resolve({});
+    await element.updateComplete;
 
     assert.isTrue(apiSpy.calledOnce);
     assert.equal(apiSpy.lastCall.args[2],
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts
deleted file mode 100644
index aa92654..0000000
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-shared-style.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// Mark the file as a module. Otherwise typescript assumes this is a script
-// and $_documentContainer is a global variable.
-// See: https://www.typescriptlang.org/docs/handbook/modules.html
-export {};
-
-/** The shared styles for all hover cards. */
-const GrHoverCardSharedStyle = document.createElement('dom-module');
-GrHoverCardSharedStyle.innerHTML = `<template>
-    <style include="shared-styles">
-      :host {
-        position: absolute;
-        display: none;
-        z-index: 200;
-        max-width: 600px;
-        outline: none;
-      }
-      :host(.hovered) {
-        display: block;
-      }
-      :host(.hide) {
-        visibility: hidden;
-      }
-      /* You have to use a <div class="container"> in your hovercard in order
-         to pick up this consistent styling. */
-      #container {
-        background: var(--dialog-background-color);
-        border: 1px solid var(--border-color);
-        border-radius: var(--border-radius);
-        box-shadow: var(--elevation-level-5);
-      }
-    </style>
-  </template>`;
-
-GrHoverCardSharedStyle.register('gr-hovercard-shared-style');
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.ts b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.ts
index acc5e15..bf35c06 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.ts
@@ -15,20 +15,32 @@
  * limitations under the License.
  */
 
-import '../../../styles/shared-styles';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-hovercard_html';
-import {HovercardBehaviorMixin} from './gr-hovercard-behavior';
-import './gr-hovercard-shared-style';
-import {customElement} from '@polymer/decorators';
+import {customElement} from 'lit/decorators';
+import {HovercardMixin} from '../../../mixins/hovercard-mixin/hovercard-mixin';
+import {css, html, LitElement} from 'lit';
 
 // This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = HovercardBehaviorMixin(PolymerElement);
+const base = HovercardMixin(LitElement);
 
 @customElement('gr-hovercard')
 export class GrHovercard extends base {
-  static get template() {
-    return htmlTemplate;
+  static override get styles() {
+    return [
+      base.styles ?? [],
+      css`
+        #container {
+          padding: var(--spacing-l);
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    return html`
+      <div id="container" role="tooltip" tabindex="-1">
+        <slot></slot>
+      </div>
+    `;
   }
 }
 
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts
deleted file mode 100644
index 830cbd878..0000000
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_html.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-hovercard-shared-style">
-    #container {
-      padding: var(--spacing-l);
-    }
-  </style>
-  <div id="container" role="tooltip" tabindex="-1">
-    <slot></slot>
-  </div>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_test.js b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_test.js
deleted file mode 100644
index 27ef23f..0000000
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_test.js
+++ /dev/null
@@ -1,166 +0,0 @@
-/**
- * @license
- * Copyright (C) 2018 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import '../../../test/common-test-setup-karma.js';
-import './gr-hovercard.js';
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
-
-const basicFixture = fixtureFromTemplate(html`
-<gr-hovercard for="foo" id="bar"></gr-hovercard>
-`);
-
-suite('gr-hovercard tests', () => {
-  let element;
-
-  let button;
-  let testResolve;
-  let testPromise;
-
-  setup(() => {
-    testResolve = undefined;
-    testPromise = new Promise(r => testResolve = r);
-    button = document.createElement('button');
-    button.innerHTML = 'Hello';
-    button.setAttribute('id', 'foo');
-    document.body.appendChild(button);
-
-    element = basicFixture.instantiate();
-  });
-
-  teardown(() => {
-    element.hide({});
-    button.remove();
-  });
-
-  test('updatePosition', () => {
-    // Test that the correct style properties have at least been set.
-    element.position = 'bottom';
-    element.updatePosition();
-    assert.typeOf(element.style.getPropertyValue('left'), 'string');
-    assert.typeOf(element.style.getPropertyValue('top'), 'string');
-    assert.typeOf(element.style.getPropertyValue('paddingTop'), 'string');
-    assert.typeOf(element.style.getPropertyValue('marginTop'), 'string');
-
-    const parentRect = document.documentElement.getBoundingClientRect();
-    const targetRect = element._target.getBoundingClientRect();
-    const thisRect = element.getBoundingClientRect();
-
-    const targetLeft = targetRect.left - parentRect.left;
-    const targetTop = targetRect.top - parentRect.top;
-
-    const pixelCompare = pixel =>
-      Math.round(parseInt(pixel.substring(0, pixel.length - 1)), 10);
-
-    assert.equal(
-        pixelCompare(element.style.left),
-        pixelCompare(
-            (targetLeft + (targetRect.width - thisRect.width) / 2) + 'px'));
-    assert.equal(
-        pixelCompare(element.style.top),
-        pixelCompare(
-            (targetTop + targetRect.height + element.offset) + 'px'));
-  });
-
-  test('hide', () => {
-    element.hide({});
-    const style = getComputedStyle(element);
-    assert.isFalse(element._isShowing);
-    assert.isFalse(element.classList.contains('hovered'));
-    assert.equal(style.display, 'none');
-    assert.notEqual(element.container, element.parentNode);
-  });
-
-  test('show', () => {
-    element.show({});
-    const style = getComputedStyle(element);
-    assert.isTrue(element._isShowing);
-    assert.isTrue(element.classList.contains('hovered'));
-    assert.equal(style.opacity, '1');
-    assert.equal(style.visibility, 'visible');
-  });
-
-  test('debounceShow does not show immediately', async () => {
-    element.debounceShowBy(100);
-    setTimeout(testResolve, 0);
-    await testPromise;
-    assert.isFalse(element._isShowing);
-  });
-
-  test('debounceShow shows after delay', async () => {
-    element.debounceShowBy(1);
-    setTimeout(testResolve, 10);
-    await testPromise;
-    assert.isTrue(element._isShowing);
-  });
-
-  test('card is scheduled to show on enter and hides on leave', async () => {
-    const button = document.querySelector('button');
-    let enterResolve = undefined;
-    const enterPromise = new Promise(r => enterResolve = r);
-    button.addEventListener('mouseenter', enterResolve);
-    let leaveResolve = undefined;
-    const leavePromise = new Promise(r => leaveResolve = r);
-    button.addEventListener('mouseleave', leaveResolve);
-
-    assert.isFalse(element._isShowing);
-    button.dispatchEvent(new CustomEvent('mouseenter'));
-
-    await enterPromise;
-    assert.isTrue(element.isScheduledToShow);
-    element.showTask.flush();
-    assert.isTrue(element._isShowing);
-    assert.isFalse(element.isScheduledToShow);
-
-    button.dispatchEvent(new CustomEvent('mouseleave'));
-
-    await leavePromise;
-    assert.isTrue(element.isScheduledToHide);
-    assert.isTrue(element._isShowing);
-    element.hideTask.flush();
-    assert.isFalse(element.isScheduledToShow);
-    assert.isFalse(element._isShowing);
-
-    button.removeEventListener('mouseenter', enterResolve);
-    button.removeEventListener('mouseleave', leaveResolve);
-  });
-
-  test('card should disappear on click', async () => {
-    const button = document.querySelector('button');
-    let enterResolve = undefined;
-    const enterPromise = new Promise(r => enterResolve = r);
-    button.addEventListener('mouseenter', enterResolve);
-    let clickResolve = undefined;
-    const clickPromise = new Promise(r => clickResolve = r);
-    button.addEventListener('click', clickResolve);
-
-    assert.isFalse(element._isShowing);
-
-    button.dispatchEvent(new CustomEvent('mouseenter'));
-
-    await enterPromise;
-    assert.isTrue(element.isScheduledToShow);
-    MockInteractions.tap(button);
-
-    await clickPromise;
-    assert.isFalse(element.isScheduledToShow);
-    assert.isFalse(element._isShowing);
-
-    button.removeEventListener('mouseenter', enterResolve);
-    button.removeEventListener('click', clickResolve);
-  });
-});
-
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api_test.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api_test.js
index 203784d..87f6052 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api_test.js
@@ -125,7 +125,7 @@
           .querySelector('[data-action-key="' + key + '"]'));
     });
 
-    test('action button properties', () => {
+    test('action button properties', async () => {
       const key = changeActions.add(changeActions.ActionType.REVISION, 'Bork!');
       flush();
       const button = element.shadowRoot
@@ -137,17 +137,17 @@
       changeActions.setTitle(key, 'Yo hint');
       changeActions.setEnabled(key, false);
       changeActions.setIcon(key, 'pupper');
-      flush();
+      await flush();
       assert.equal(button.getAttribute('data-label'), 'Yo');
-      assert.equal(button.getAttribute('title'), 'Yo hint');
+      assert.equal(button.parentElement.getAttribute('title'), 'Yo hint');
       assert.isTrue(button.disabled);
       assert.equal(button.querySelector('iron-icon').icon,
           'gr-icons:pupper');
     });
 
-    test('hide action buttons', () => {
+    test('hide action buttons', async () => {
       const key = changeActions.add(changeActions.ActionType.REVISION, 'Bork!');
-      flush();
+      await flush();
       let button = element.shadowRoot
           .querySelector('[data-action-key="' + key + '"]');
       assert.isOk(button);
@@ -168,7 +168,7 @@
           .querySelector('[data-action-key="' + key + '"]'));
       changeActions.setActionOverflow(
           changeActions.ActionType.REVISION, key, true);
-      flush();
+      await flush();
       assert.isNotOk(element.shadowRoot
           .querySelector('[data-action-key="' + key + '"]'));
       assert.isFalse(element.$.moreActions.hidden);
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-gerrit.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-gerrit.ts
index 85491ef..1d4bd06 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-gerrit.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-gerrit.ts
@@ -34,6 +34,7 @@
 import {fontStyles} from '../../../styles/gr-font-styles';
 import {formStyles} from '../../../styles/gr-form-styles';
 import {menuPageStyles} from '../../../styles/gr-menu-page-styles';
+import {spinnerStyles} from '../../../styles/gr-spinner-styles';
 import {subpageStyles} from '../../../styles/gr-subpage-styles';
 import {tableStyles} from '../../../styles/gr-table-styles';
 
@@ -125,6 +126,7 @@
     font: fontStyles,
     form: formStyles,
     menuPage: menuPageStyles,
+    spinner: spinnerStyles,
     subPage: subpageStyles,
     table: tableStyles,
   };
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
index 026ca4c..2df2ccb 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
@@ -22,23 +22,28 @@
 import '../gr-button/gr-button';
 import '../gr-icons/gr-icons';
 import '../gr-label/gr-label';
+import '../gr-tooltip-content/gr-tooltip-content';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-label-info_html';
-import {GerritNav} from '../../core/gr-navigation/gr-navigation';
-import {customElement, property} from '@polymer/decorators';
 import {
-  ChangeInfo,
   AccountInfo,
   LabelInfo,
   ApprovalInfo,
   AccountId,
   isQuickLabelInfo,
   isDetailedLabelInfo,
+  LabelNameToInfoMap,
 } from '../../../types/common';
+import {LitElement, css, html} from 'lit';
+import {customElement, property} from 'lit/decorators';
 import {GrButton} from '../gr-button/gr-button';
 import {getVotingRangeOrDefault} from '../../../utils/label-util';
 import {appContext} from '../../../services/app-context';
+import {ParsedChangeInfo} from '../../../types/types';
+import {fontStyles} from '../../../styles/gr-font-styles';
+import {sharedStyles} from '../../../styles/shared-styles';
+import {votingStyles} from '../../../styles/gr-voting-styles';
+import {ifDefined} from 'lit/directives/if-defined';
+import {fireReload} from '../../../utils/event-util';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -55,16 +60,12 @@
 
 interface FormattedLabel {
   className?: LabelClassName;
-  account: ApprovalInfo;
+  account: ApprovalInfo | AccountInfo;
   value: string;
 }
 
 @customElement('gr-label-info')
-export class GrLabelInfo extends PolymerElement {
-  static get template() {
-    return htmlTemplate;
-  }
-
+export class GrLabelInfo extends LitElement {
   @property({type: Object})
   labelInfo?: LabelInfo;
 
@@ -72,7 +73,7 @@
   label = '';
 
   @property({type: Object})
-  change?: ChangeInfo;
+  change?: ParsedChangeInfo;
 
   @property({type: Object})
   account?: AccountInfo;
@@ -87,11 +88,150 @@
   // TODO(TS): not used, remove later
   _xhrPromise?: Promise<void>;
 
+  static override get styles() {
+    return [
+      sharedStyles,
+      fontStyles,
+      votingStyles,
+      css`
+        .placeholder {
+          color: var(--deemphasized-text-color);
+        }
+        .hidden {
+          display: none;
+        }
+        /* Note that most of the .voteChip styles are coming from the
+         gr-voting-styles include. */
+        .voteChip {
+          display: flex;
+          justify-content: center;
+          margin-right: var(--spacing-s);
+          padding: 1px;
+        }
+        .max {
+          background-color: var(--vote-color-approved);
+        }
+        .min {
+          background-color: var(--vote-color-rejected);
+        }
+        .positive {
+          background-color: var(--vote-color-recommended);
+          border-radius: 12px;
+          border: 1px solid var(--vote-outline-recommended);
+          color: var(--chip-color);
+        }
+        .negative {
+          background-color: var(--vote-color-disliked);
+          border-radius: 12px;
+          border: 1px solid var(--vote-outline-disliked);
+          color: var(--chip-color);
+        }
+        .hidden {
+          display: none;
+        }
+        td {
+          vertical-align: top;
+        }
+        tr {
+          min-height: var(--line-height-normal);
+        }
+        gr-tooltip-content {
+          display: block;
+        }
+        gr-button {
+          vertical-align: top;
+        }
+        gr-button::part(paper-button) {
+          height: var(--line-height-normal);
+          width: var(--line-height-normal);
+          padding: 0;
+        }
+        gr-button[disabled] iron-icon {
+          color: var(--border-color);
+        }
+        gr-account-link {
+          --account-max-length: 100px;
+          margin-right: var(--spacing-xs);
+        }
+        iron-icon {
+          height: calc(var(--line-height-normal) - 2px);
+          width: calc(var(--line-height-normal) - 2px);
+        }
+        .labelValueContainer:not(:first-of-type) td {
+          padding-top: var(--spacing-s);
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    return html` <p
+        class="placeholder ${this.computeShowPlaceholder(
+          this.labelInfo,
+          this.change?.labels
+        )}"
+      >
+        No votes
+      </p>
+      <table>
+        ${this.mapLabelInfo(
+          this.labelInfo,
+          this.account,
+          this.change?.labels
+        ).map(mappedLabel => this.renderLabel(mappedLabel))}
+      </table>`;
+  }
+
+  renderLabel(mappedLabel: FormattedLabel) {
+    const {labelInfo, change} = this;
+    return html` <tr class="labelValueContainer">
+      <td>
+        <gr-tooltip-content
+          has-tooltip
+          title="${this._computeValueTooltip(labelInfo, mappedLabel.value)}"
+        >
+          <gr-label class="${mappedLabel.className} voteChip font-small">
+            ${mappedLabel.value}
+          </gr-label>
+        </gr-tooltip-content>
+      </td>
+      <td>
+        <gr-account-link
+          .account="${mappedLabel.account}"
+          .change="${change}"
+        ></gr-account-link>
+      </td>
+      <td>
+        <gr-tooltip-content has-tooltip title="Remove vote">
+          <gr-button
+            link
+            aria-label="Remove vote"
+            @click="${this.onDeleteVote}"
+            data-account-id="${ifDefined(mappedLabel.account._account_id)}"
+            class="deleteBtn ${this.computeDeleteClass(
+              mappedLabel.account,
+              this.mutable,
+              change
+            )}"
+          >
+            <iron-icon icon="gr-icons:delete"></iron-icon>
+          </gr-button>
+        </gr-tooltip-content>
+      </td>
+    </tr>`;
+  }
+
   /**
    * This method also listens on change.labels.*,
    * to trigger computation when a label is removed from the change.
+   *
+   * The third parameter is just for *triggering* computation.
    */
-  _mapLabelInfo(labelInfo?: LabelInfo, account?: AccountInfo) {
+  private mapLabelInfo(
+    labelInfo?: LabelInfo,
+    account?: AccountInfo,
+    _?: LabelNameToInfoMap
+  ): FormattedLabel[] {
     const result: FormattedLabel[] = [];
     if (!labelInfo) {
       return result;
@@ -106,7 +246,8 @@
           {
             value: ok ? '👍️' : '👎️',
             className: ok ? LabelClassName.POSITIVE : LabelClassName.NEGATIVE,
-            account: ok ? labelInfo.approved : labelInfo.rejected,
+            // executed only if approved or rejected is not undefined
+            account: ok ? labelInfo.approved! : labelInfo.rejected!,
           },
         ];
       }
@@ -141,7 +282,7 @@
             labelClassName = LabelClassName.NEGATIVE;
           }
         }
-        const formattedLabel = {
+        const formattedLabel: FormattedLabel = {
           value: `${labelValPrefix}${label.value}`,
           className: labelClassName,
           account: label,
@@ -165,16 +306,16 @@
    * @param reviewer An object describing the reviewer that left the
    *     vote.
    */
-  _computeDeleteClass(
+  private computeDeleteClass(
     reviewer: ApprovalInfo,
     mutable: boolean,
-    change: ChangeInfo
+    change?: ParsedChangeInfo
   ) {
     if (!mutable || !change || !change.removable_reviewers) {
       return 'hidden';
     }
     const removable = change.removable_reviewers;
-    if (removable.find(r => r._account_id === reviewer._account_id)) {
+    if (removable.find(r => r._account_id === reviewer?._account_id)) {
       return '';
     }
     return 'hidden';
@@ -184,7 +325,7 @@
    * Closure annotation for Polymer.prototype.splice is off.
    * For now, suppressing annotations.
    */
-  _onDeleteVote(e: MouseEvent) {
+  private onDeleteVote(e: MouseEvent) {
     if (!this.change) return;
 
     e.preventDefault();
@@ -208,7 +349,7 @@
           return;
         }
         if (this.change) {
-          GerritNav.navigateToChange(this.change);
+          fireReload(this);
         }
       })
       .catch(err => {
@@ -218,7 +359,7 @@
       });
   }
 
-  _computeValueTooltip(labelInfo: LabelInfo, score: string) {
+  _computeValueTooltip(labelInfo: LabelInfo | undefined, score: string) {
     if (
       !labelInfo ||
       !isDetailedLabelInfo(labelInfo) ||
@@ -232,8 +373,13 @@
   /**
    * This method also listens change.labels.* in
    * order to trigger computation when a label is removed from the change.
+   *
+   * The second parameter is just for *triggering* computation.
    */
-  _computeShowPlaceholder(labelInfo?: LabelInfo) {
+  private computeShowPlaceholder(
+    labelInfo?: LabelInfo,
+    _?: LabelNameToInfoMap
+  ) {
     if (!labelInfo) {
       return '';
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
deleted file mode 100644
index f31b57f..0000000
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
+++ /dev/null
@@ -1,133 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="gr-font-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="gr-voting-styles">
-    /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
-  </style>
-  <style include="shared-styles">
-    .placeholder {
-      color: var(--deemphasized-text-color);
-    }
-    .hidden {
-      display: none;
-    }
-    /* Note that most of the .voteChip styles are coming from the
-       gr-voting-styles include. */
-    .voteChip {
-      display: flex;
-      justify-content: center;
-      margin-right: var(--spacing-s);
-      padding: 1px;
-    }
-    .max {
-      background-color: var(--vote-color-approved);
-    }
-    .min {
-      background-color: var(--vote-color-rejected);
-    }
-    .positive {
-      background-color: var(--vote-color-recommended);
-      border-radius: 12px;
-      border: 1px solid var(--vote-outline-recommended);
-      color: var(--chip-color);
-    }
-    .negative {
-      background-color: var(--vote-color-disliked);
-      border-radius: 12px;
-      border: 1px solid var(--vote-outline-disliked);
-      color: var(--chip-color);
-    }
-    .hidden {
-      display: none;
-    }
-    td {
-      vertical-align: top;
-    }
-    tr {
-      min-height: var(--line-height-normal);
-    }
-    gr-button {
-      vertical-align: top;
-      --gr-button: {
-        height: var(--line-height-normal);
-        width: var(--line-height-normal);
-        padding: 0;
-      }
-    }
-    gr-button[disabled] iron-icon {
-      color: var(--border-color);
-    }
-    gr-account-link {
-      --account-max-length: 100px;
-      margin-right: var(--spacing-xs);
-    }
-    iron-icon {
-      height: calc(var(--line-height-normal) - 2px);
-      width: calc(var(--line-height-normal) - 2px);
-    }
-    .labelValueContainer:not(:first-of-type) td {
-      padding-top: var(--spacing-s);
-    }
-  </style>
-  <p
-    class$="placeholder [[_computeShowPlaceholder(labelInfo, change.labels.*)]]"
-  >
-    No votes
-  </p>
-  <table>
-    <template
-      is="dom-repeat"
-      items="[[_mapLabelInfo(labelInfo, account, change.labels.*)]]"
-      as="mappedLabel"
-    >
-      <tr class="labelValueContainer">
-        <td>
-          <gr-label
-            has-tooltip=""
-            title="[[_computeValueTooltip(labelInfo, mappedLabel.value)]]"
-            class$="[[mappedLabel.className]] voteChip font-small"
-          >
-            [[mappedLabel.value]]
-          </gr-label>
-        </td>
-        <td>
-          <gr-account-link
-            account="[[mappedLabel.account]]"
-            change="[[change]]"
-          ></gr-account-link>
-        </td>
-        <td>
-          <gr-button
-            link=""
-            aria-label="Remove vote"
-            on-click="_onDeleteVote"
-            tooltip="Remove vote"
-            data-account-id$="[[mappedLabel.account._account_id]]"
-            class$="deleteBtn [[_computeDeleteClass(mappedLabel.account, mutable, change)]]"
-          >
-            <iron-icon icon="gr-icons:delete"></iron-icon>
-          </gr-button>
-        </td>
-      </tr>
-    </template>
-  </table>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_test.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_test.ts
index b3235fa..cad1f69 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_test.ts
@@ -31,7 +31,7 @@
 import {GrAccountLink} from '../gr-account-link/gr-account-link';
 import {
   createAccountWithIdNameAndEmail,
-  createChange,
+  createParsedChange,
 } from '../../../test/test-data-generators';
 import {LabelInfo} from '../../../types/common';
 
@@ -46,7 +46,7 @@
 
     // Needed to trigger computed bindings.
     element.account = {};
-    element.change = {...createChange(), labels: {}};
+    element.change = {...createParsedChange(), labels: {}};
   });
 
   suite('remove reviewer votes', () => {
@@ -60,21 +60,23 @@
       sinon.stub(element, '_computeValueTooltip').returns('');
       element.account = account;
       element.change = {
-        ...createChange(),
+        ...createParsedChange(),
         labels: {'Code-Review': label},
       };
       element.labelInfo = label;
       element.label = 'Code-Review';
 
-      await flush();
+      await element.updateComplete;
     });
 
-    test('_computeCanDeleteVote', () => {
+    test('_computeCanDeleteVote', async () => {
       element.mutable = false;
+      await element.updateComplete;
       const removeButton = queryAndAssert<GrButton>(element, 'gr-button');
       assert.isTrue(isHidden(removeButton));
       element.change!.removable_reviewers = [account];
       element.mutable = true;
+      await element.updateComplete;
       assert.isFalse(isHidden(removeButton));
     });
 
@@ -109,14 +111,14 @@
   suite('label color and order', () => {
     test('valueless label rejected', async () => {
       element.labelInfo = {rejected: {name: 'someone'}};
-      await flush();
+      await element.updateComplete;
       const labels = queryAll<GrLabel>(element, 'gr-label');
       assert.isTrue(labels[0].classList.contains('negative'));
     });
 
     test('valueless label approved', async () => {
       element.labelInfo = {approved: {name: 'someone'}};
-      await flush();
+      await element.updateComplete;
       const labels = queryAll<GrLabel>(element, 'gr-label');
       assert.isTrue(labels[0].classList.contains('positive'));
     });
@@ -137,7 +139,7 @@
           '+2': 'Ready to submit',
         },
       };
-      await flush();
+      await element.updateComplete;
       const labels = queryAll<GrLabel>(element, 'gr-label');
       assert.isTrue(labels[0].classList.contains('max'));
       assert.isTrue(labels[1].classList.contains('positive'));
@@ -157,7 +159,7 @@
           '+1': 'Looks good to me',
         },
       };
-      await flush();
+      await element.updateComplete;
       const labels = queryAll<GrLabel>(element, 'gr-label');
       assert.isTrue(labels[0].classList.contains('max'));
       assert.isTrue(labels[1].classList.contains('min'));
@@ -175,7 +177,7 @@
           '+2': 'Looks good to me',
         },
       };
-      await flush();
+      await element.updateComplete;
       const labels = queryAll<GrLabel>(element, 'gr-label');
       assert.isTrue(labels[0].classList.contains('max'));
       assert.isTrue(labels[1].classList.contains('positive'));
@@ -195,7 +197,7 @@
           '+1': 'Looks good to me',
         },
       };
-      await flush();
+      await element.updateComplete;
       const chips = queryAll<GrAccountLink>(element, 'gr-account-link');
       assert.equal(chips[0].account!._account_id, element.account._account_id);
     });
@@ -217,7 +219,7 @@
     assert.equal(element._computeValueTooltip(labelInfo, score), '');
   });
 
-  test('placeholder', () => {
+  test('placeholder', async () => {
     const values = {
       '0': 'No score',
       '+1': 'good',
@@ -226,30 +228,37 @@
       '-2': 'terrible',
     };
     element.labelInfo = {};
+    await element.updateComplete;
     assert.isFalse(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
     element.labelInfo = {all: [], values};
+    await element.updateComplete;
     assert.isFalse(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
     element.labelInfo = {all: [{value: 1}], values};
+    await element.updateComplete;
     assert.isTrue(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
     element.labelInfo = {rejected: account};
+    await element.updateComplete;
     assert.isTrue(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
     element.labelInfo = {rejected: account, all: [{value: 1}], values};
+    await element.updateComplete;
     assert.isTrue(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
     element.labelInfo = {approved: account};
+    await element.updateComplete;
     assert.isTrue(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
     element.labelInfo = {approved: account, all: [{value: 1}], values};
+    await element.updateComplete;
     assert.isTrue(
       isHidden(queryAndAssert<HTMLParagraphElement>(element, '.placeholder'))
     );
diff --git a/polygerrit-ui/app/elements/shared/gr-label/gr-label.ts b/polygerrit-ui/app/elements/shared/gr-label/gr-label.ts
index fd10145..842b35e 100644
--- a/polygerrit-ui/app/elements/shared/gr-label/gr-label.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label/gr-label.ts
@@ -21,10 +21,8 @@
  * used in gr-label-info.
  */
 
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {customElement} from '@polymer/decorators';
-import {htmlTemplate} from './gr-label_html';
-import {TooltipMixin} from '../../../mixins/gr-tooltip-mixin/gr-tooltip-mixin';
+import {html, LitElement} from 'lit';
+import {customElement} from 'lit/decorators';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -32,12 +30,13 @@
   }
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = TooltipMixin(PolymerElement);
-
 @customElement('gr-label')
-export class GrLabel extends base {
-  static get template() {
-    return htmlTemplate;
+export class GrLabel extends LitElement {
+  static override get styles() {
+    return [];
+  }
+
+  override render() {
+    return html` <slot></slot> `;
   }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.ts b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.ts
index f5a0c4d..7008db2 100644
--- a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.ts
+++ b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.ts
@@ -14,10 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-limited-text_html';
-import {TooltipMixin} from '../../../mixins/gr-tooltip-mixin/gr-tooltip-mixin';
-import {customElement, observe, property} from '@polymer/decorators';
+import {customElement, property} from 'lit/decorators';
+import {html, LitElement} from 'lit';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -25,9 +23,6 @@
   }
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = TooltipMixin(PolymerElement);
-
 /**
  * The gr-limited-text element is for displaying text with a maximum length
  * (in number of characters) to display. If the length of the text exceeds the
@@ -35,57 +30,56 @@
  * and a tooltip containing the full text is enabled.
  */
 @customElement('gr-limited-text')
-export class GrLimitedText extends base {
-  static get template() {
-    return htmlTemplate;
-  }
-
+export class GrLimitedText extends LitElement {
   /** The un-truncated text to display. */
   @property({type: String})
-  text?: string;
+  text = '';
 
   /** The maximum length for the text to display before truncating. */
   @property({type: Number})
-  limit?: number;
+  limit = 0;
 
   @property({type: String})
   tooltip?: string;
 
-  /** Boolean property used by TooltipMixin. */
-  @property({type: Boolean})
-  override hasTooltip = false;
+  static override get styles() {
+    return [];
+  }
 
-  /** Boolean property used by TooltipMixin. */
-  @property({type: Boolean})
-  disableTooltip = false;
-
-  /**
-   * The text or limit have changed. Recompute whether a tooltip needs to be
-   * enabled.
-   */
-  @observe('text', 'tooltip', 'limit')
-  _updateTitle(text?: string, tooltip?: string, limit?: number) {
-    text = text ?? '';
-    tooltip = tooltip ?? '';
-    limit = limit ?? 0;
-
-    this.hasTooltip = !!tooltip || (!!limit && text.length > limit);
-    if (this.hasTooltip && !this.disableTooltip) {
-      // Combine the text and title if over-length
-      if (limit && text.length > limit) {
-        this.title = `${text}${tooltip ? ` (${tooltip})` : ''}`;
-      } else {
-        this.title = tooltip;
-      }
+  override render() {
+    if (this.tooltip || this.tooLong()) {
+      return html` <gr-tooltip-content
+        has-tooltip
+        .title=${this.renderTooltip()}
+      >
+        ${this.renderText()}
+      </gr-tooltip-content>`;
     } else {
-      this.title = '';
+      return this.renderText();
     }
   }
 
-  _computeDisplayText(text?: string, limit?: number) {
-    if (!!limit && !!text && text.length > limit) {
-      return text.substr(0, limit - 1) + '…';
+  // Should be private but used in tests.
+  renderText() {
+    if (this.tooLong()) {
+      return this.text.substr(0, this.limit - 1) + '…';
     }
-    return text;
+    return this.text;
+  }
+
+  private renderTooltip() {
+    if (this.tooLong()) {
+      return `${this.text}${this.tooltip ? ` (${this.tooltip})` : ''}`;
+    } else if (this.tooltip) {
+      return this.tooltip;
+    } else {
+      return '';
+    }
+  }
+
+  private tooLong() {
+    if (!this.limit) return false;
+    if (!this.text) return false;
+    return this.text.length > this.limit;
   }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts
deleted file mode 100644
index b942d07..0000000
--- a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_html.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html` [[_computeDisplayText(text, limit)]] `;
diff --git a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_test.js b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_test.js
index 3b99d6d..e3e72d0 100644
--- a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text_test.js
@@ -23,77 +23,65 @@
 suite('gr-limited-text tests', () => {
   let element;
 
-  setup(() => {
+  setup(async () => {
     element = basicFixture.instantiate();
+    await element.updateComplete;
   });
 
-  test('tooltip without title input', () => {
-    const updateSpy = sinon.spy(element, '_updateTitle');
+  test('tooltip without title input', async () => {
     element.text = 'abc 123';
-    flush();
-    assert.isTrue(updateSpy.calledOnce);
-    assert.isNotOk(element.getAttribute('title'));
-    assert.isFalse(element.hasTooltip);
+    await element.updateComplete;
+    assert.isNotOk(element.shadowRoot.querySelector('gr-tooltip-content'));
 
     element.limit = 10;
-    flush();
-    assert.isTrue(updateSpy.calledTwice);
-    assert.isNotOk(element.getAttribute('title'));
-    assert.isFalse(element.hasTooltip);
+    await element.updateComplete;
+    assert.isNotOk(element.shadowRoot.querySelector('gr-tooltip-content'));
 
     element.limit = 3;
-    flush();
-    assert.equal(updateSpy.callCount, 3);
-    assert.equal(element.getAttribute('title'), 'abc 123');
-    assert.equal(element.title, 'abc 123');
-    assert.isTrue(element.hasTooltip);
+    await element.updateComplete;
+    assert.isOk(element.shadowRoot.querySelector('gr-tooltip-content'));
+    assert.equal(
+        element.shadowRoot.querySelector('gr-tooltip-content').title,
+        'abc 123');
 
     element.limit = 100;
-    flush();
-    assert.equal(updateSpy.callCount, 4);
-    assert.isFalse(element.hasTooltip);
+    await element.updateComplete;
+    assert.isNotOk(element.shadowRoot.querySelector('gr-tooltip-content'));
 
     element.limit = null;
-    flush();
-    assert.equal(updateSpy.callCount, 5);
-    assert.isNotOk(element.getAttribute('title'));
-    assert.isFalse(element.hasTooltip);
+    await element.updateComplete;
+    assert.isNotOk(element.shadowRoot.querySelector('gr-tooltip-content'));
   });
 
-  test('with tooltip input', () => {
-    const updateSpy = sinon.spy(element, '_updateTitle');
+  test('with tooltip input', async () => {
     element.tooltip = 'abc 123';
-    flush();
-    assert.isTrue(updateSpy.calledOnce);
-    assert.isTrue(element.hasTooltip);
-    assert.equal(element.getAttribute('title'), 'abc 123');
-    assert.equal(element.title, 'abc 123');
+    await element.updateComplete;
+    let tooltipContent = element.shadowRoot.querySelector('gr-tooltip-content');
+    assert.isOk(tooltipContent);
+    assert.equal(tooltipContent.title, 'abc 123');
 
     element.text = 'abc';
-    flush();
-    assert.equal(element.getAttribute('title'), 'abc 123');
-    assert.isTrue(element.hasTooltip);
+    await element.updateComplete;
+    tooltipContent = element.shadowRoot.querySelector('gr-tooltip-content');
+    assert.isOk(tooltipContent);
+    assert.equal(tooltipContent.title, 'abc 123');
 
     element.text = 'abcdef';
     element.limit = 3;
-    flush();
-    assert.equal(element.getAttribute('title'), 'abcdef (abc 123)');
-    assert.isTrue(element.hasTooltip);
+    await element.updateComplete;
+    tooltipContent = element.shadowRoot.querySelector('gr-tooltip-content');
+    assert.isOk(tooltipContent);
+    assert.equal(tooltipContent.title, 'abcdef (abc 123)');
   });
 
   test('_computeDisplayText', () => {
-    assert.equal(element._computeDisplayText('foo bar', 100), 'foo bar');
-    assert.equal(element._computeDisplayText('foo bar', 4), 'foo…');
-    assert.equal(element._computeDisplayText('foo bar', null), 'foo bar');
-  });
-
-  test('when disable tooltip', () => {
-    sinon.spy(element, '_updateTitle');
-    element.text = 'abcdefghijklmn';
-    element.disableTooltip = true;
-    element.limit = 10;
-    flush();
-    assert.equal(element.getAttribute('title'), '');
+    element.text = 'foo bar';
+    element.limit = 100;
+    assert.equal(element.renderText(), 'foo bar');
+    element.limit = 4;
+    assert.equal(element.renderText(), 'foo…');
+    element.limit = 0;
+    assert.equal(element.renderText(), 'foo bar');
   });
 });
 
diff --git a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts
index 5bf5a8f..801b8bf 100644
--- a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts
+++ b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts
@@ -50,7 +50,7 @@
   @property({type: Number})
   limit?: number;
 
-  static get styles() {
+  static override get styles() {
     return [
       sharedStyles,
       css`
@@ -84,9 +84,10 @@
     ];
   }
 
-  render() {
+  override render() {
     // To pass CSS mixins for @apply to Polymer components, they need to appear
     // in <style> inside the template.
+    /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
         gr-button::part(paper-button),
diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
index 055c45f..4f02897 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
@@ -53,7 +53,7 @@
   filter?: string;
 
   @property({type: Number})
-  offset?: number;
+  offset = 0;
 
   @property({type: Boolean})
   loading?: boolean;
@@ -102,8 +102,8 @@
     offset: number,
     direction: number,
     itemsPerPage: number,
-    filter: string,
-    path: string
+    filter: string | undefined,
+    path = ''
   ) {
     // Offset could be a string when passed from the router.
     offset = +(offset || 0);
diff --git a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
index 1622365..3d6b5ed 100644
--- a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
+++ b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
@@ -22,7 +22,7 @@
 import {IronOverlayBehavior} from '@polymer/iron-overlay-behavior/iron-overlay-behavior';
 import {findActiveElement} from '../../../utils/dom-util';
 import {fireEvent} from '../../../utils/event-util';
-import {getHovercardContainer} from '../gr-hovercard/gr-hovercard-behavior';
+import {getHovercardContainer} from '../../../mixins/hovercard-mixin/hovercard-mixin';
 
 const AWAIT_MAX_ITERS = 10;
 const AWAIT_STEP = 5;
@@ -40,6 +40,9 @@
   IronOverlayBehavior as IronOverlayBehavior
 );
 
+/**
+ * @attr {Boolean} with-backdrop - inherited from IronOverlay
+ */
 @customElement('gr-overlay')
 export class GrOverlay extends base {
   static get template() {
diff --git a/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.ts b/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.ts
index b2477dd..423a1a8 100644
--- a/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.ts
+++ b/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.ts
@@ -53,7 +53,7 @@
     this.bodyScrollHandler = () => this._handleBodyScroll();
   }
 
-  connectedCallback() {
+  override connectedCallback() {
     super.connectedCallback();
     window.addEventListener('scroll', this.bodyScrollHandler);
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-select/gr-select.ts b/polygerrit-ui/app/elements/shared/gr-select/gr-select.ts
index e71add9..571272d 100644
--- a/polygerrit-ui/app/elements/shared/gr-select/gr-select.ts
+++ b/polygerrit-ui/app/elements/shared/gr-select/gr-select.ts
@@ -34,7 +34,7 @@
   }
 
   @property({type: String, notify: true})
-  bindValue?: string;
+  bindValue?: string | number;
 
   get nativeSelect() {
     // gr-select is not a shadow component
@@ -49,14 +49,12 @@
     // It's possible to have a value of 0.
     if (this.bindValue !== undefined) {
       // Set for chrome/safari so it happens instantly
-      this.nativeSelect.value = this.bindValue;
+      this.nativeSelect.value = String(this.bindValue);
       // Async needed for firefox to populate value. It was trying to do it
       // before options from a dom-repeat were rendered previously.
       // See https://bugs.chromium.org/p/gerrit/issues/detail?id=7735
       setTimeout(() => {
-        // TODO(TS): maybe should check for undefined before assigning
-        // or fallback to ''
-        this.nativeSelect.value = this.bindValue!;
+        this.nativeSelect.value = String(this.bindValue);
       }, 1);
     }
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
index ce1eec3..434da1f 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
@@ -33,7 +33,7 @@
   Item,
   ItemSelectedEvent,
 } from '../gr-autocomplete-dropdown/gr-autocomplete-dropdown';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 
 const MAX_ITEMS_DROPDOWN = 10;
 
@@ -238,7 +238,7 @@
     this._setEmoji(this.$.emojiSuggestions.getCurrentText());
   }
 
-  _handleEnterByKey(e: CustomKeyboardEvent) {
+  _handleEnterByKey(e: IronKeyboardEvent) {
     // Enter should have newline behavior if the picker is closed or if the user
     // has only typed ':'. Also make sure that shortcuts aren't clobbered.
     if (this._hideEmojiAutocomplete || this.disableEnterKeyForSelectingEmoji) {
@@ -420,7 +420,7 @@
     );
   }
 
-  private indent(e: CustomKeyboardEvent): void {
+  private indent(e: IronKeyboardEvent): void {
     if (!document.queryCommandSupported('insertText')) {
       return;
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts
index 7790c73..7e59692 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea_test.ts
@@ -20,7 +20,7 @@
 import {GrTextarea} from './gr-textarea';
 import {html} from '@polymer/polymer/lib/utils/html-tag';
 import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
-import {CustomKeyboardEvent} from '../../../types/events';
+import {IronKeyboardEvent} from '../../../types/events';
 import {ItemSelectedEvent} from '../gr-autocomplete-dropdown/gr-autocomplete-dropdown';
 
 const basicFixture = fixtureFromElement('gr-textarea');
@@ -240,7 +240,7 @@
     element._handleEnterByKey(
       new CustomEvent('keydown', {
         detail: {keyboardEvent: {keyCode: 13}},
-      }) as CustomKeyboardEvent
+      }) as IronKeyboardEvent
     );
     await flush();
     assert.deepEqual(indentCommand.args[0], ['insertText', false, '\n    ']);
@@ -252,7 +252,7 @@
     element._handleEnterByKey(
       new CustomEvent('keydown', {
         detail: {keyboardEvent: {keyCode: 13, ctrlKey: true}},
-      }) as CustomKeyboardEvent
+      }) as IronKeyboardEvent
     );
     await flush();
     assert.isTrue(indentCommand.notCalled);
@@ -260,7 +260,7 @@
     element._handleEnterByKey(
       new CustomEvent('keydown', {
         detail: {keyboardEvent: {keyCode: 13, metaKey: true}},
-      }) as CustomKeyboardEvent
+      }) as IronKeyboardEvent
     );
     await flush();
     assert.isTrue(indentCommand.notCalled);
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts
index 9d228ab..0585aec8 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts
@@ -15,10 +15,13 @@
  * limitations under the License.
  */
 import '../gr-icons/gr-icons';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-tooltip-content_html';
-import {TooltipMixin} from '../../../mixins/gr-tooltip-mixin/gr-tooltip-mixin';
-import {customElement, property} from '@polymer/decorators';
+import '../gr-tooltip/gr-tooltip';
+import {getRootElement} from '../../../scripts/rootElement';
+import {GrTooltip} from '../gr-tooltip/gr-tooltip';
+import {css, html, LitElement, PropertyValues} from 'lit';
+import {customElement, property, state} from 'lit/decorators';
+
+const BOTTOM_OFFSET = 7.2; // Height of the arrow in tooltip.
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -26,21 +29,202 @@
   }
 }
 
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = TooltipMixin(PolymerElement);
-
-/**
- * Transclude anything inside and wrap them to support tooltip functionality.
- */
 @customElement('gr-tooltip-content')
-export class GrTooltipContent extends base {
-  static get template() {
-    return htmlTemplate;
-  }
+export class GrTooltipContent extends LitElement {
+  @property({type: Boolean, attribute: 'has-tooltip', reflect: true})
+  hasTooltip = false;
 
-  @property({type: String, reflectToAttribute: true})
+  @property({type: Boolean, attribute: 'position-below', reflect: true})
+  positionBelow = false;
+
+  @property({type: String, attribute: 'max-width', reflect: true})
   maxWidth?: string;
 
-  @property({type: Boolean})
+  @property({type: Boolean, attribute: 'show-icon'})
   showIcon = false;
+
+  // Should be private but used in tests.
+  @state()
+  isTouchDevice = 'ontouchstart' in document.documentElement;
+
+  // Should be private but used in tests.
+  tooltip: GrTooltip | null = null;
+
+  @state()
+  private originalTitle = '';
+
+  private hasSetupTooltipListeners = false;
+
+  private readonly windowScrollHandler: () => void;
+
+  private readonly showHandler: () => void;
+
+  private readonly hideHandler: (e: Event) => void;
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any
+  constructor() {
+    super();
+    this.windowScrollHandler = () => this._handleWindowScroll();
+    this.showHandler = () => this._handleShowTooltip();
+    this.hideHandler = (e: Event | undefined) => this._handleHideTooltip(e);
+  }
+
+  override disconnectedCallback() {
+    this._handleHideTooltip(undefined);
+    this.removeEventListener('mouseenter', this.showHandler);
+    window.removeEventListener('scroll', this.windowScrollHandler);
+    super.disconnectedCallback();
+  }
+
+  static override get styles() {
+    return [
+      css`
+        iron-icon {
+          width: var(--line-height-normal);
+          height: var(--line-height-normal);
+          vertical-align: top;
+        }
+      `,
+    ];
+  }
+
+  override render() {
+    return html`
+      <slot></slot>
+      ${this.renderIcon()}
+    `;
+  }
+
+  renderIcon() {
+    if (!this.showIcon) return;
+    return html`<iron-icon icon="gr-icons:info"></iron-icon>`;
+  }
+
+  override updated(changedProperties: PropertyValues) {
+    if (changedProperties.has('hasTooltip')) {
+      this.setupTooltipListeners();
+    }
+  }
+
+  private setupTooltipListeners() {
+    if (!this.hasTooltip) {
+      if (this.hasSetupTooltipListeners) {
+        // if attribute set to false, remove the listener
+        this.removeEventListener('mouseenter', this.showHandler);
+        this.hasSetupTooltipListeners = false;
+      }
+      return;
+    }
+
+    if (this.hasSetupTooltipListeners) {
+      return;
+    }
+    this.hasSetupTooltipListeners = true;
+    this.addEventListener('mouseenter', this.showHandler);
+  }
+
+  _handleShowTooltip() {
+    if (this.isTouchDevice) {
+      return;
+    }
+
+    if (
+      !this.hasAttribute('title') ||
+      this.getAttribute('title') === '' ||
+      this.tooltip
+    ) {
+      return;
+    }
+
+    // Store the title attribute text then set it to an empty string to
+    // prevent it from showing natively.
+    this.originalTitle = this.getAttribute('title') || '';
+    this.setAttribute('title', '');
+
+    const tooltip = document.createElement('gr-tooltip');
+    tooltip.text = this.originalTitle;
+    tooltip.maxWidth = this.getAttribute('max-width') || '';
+    tooltip.positionBelow = this.hasAttribute('position-below');
+
+    // Set visibility to hidden before appending to the DOM so that
+    // calculations can be made based on the element’s size.
+    tooltip.style.visibility = 'hidden';
+    getRootElement().appendChild(tooltip);
+    this._positionTooltip(tooltip);
+    tooltip.style.visibility = 'initial';
+
+    this.tooltip = tooltip;
+    window.addEventListener('scroll', this.windowScrollHandler);
+    this.addEventListener('mouseleave', this.hideHandler);
+    this.addEventListener('click', this.hideHandler);
+    tooltip.addEventListener('mouseleave', this.hideHandler);
+  }
+
+  _handleHideTooltip(e: Event | undefined) {
+    if (this.isTouchDevice) {
+      return;
+    }
+    if (!this.hasAttribute('title') || !this.originalTitle) {
+      return;
+    }
+    // Do not hide if mouse left this or this.tooltip and came to this or
+    // this.tooltip
+    if (
+      (e as MouseEvent)?.relatedTarget === this.tooltip ||
+      (e as MouseEvent)?.relatedTarget === this
+    ) {
+      return;
+    }
+
+    window.removeEventListener('scroll', this.windowScrollHandler);
+    this.removeEventListener('mouseleave', this.hideHandler);
+    this.removeEventListener('click', this.hideHandler);
+    this.setAttribute('title', this.originalTitle);
+    this.tooltip?.removeEventListener('mouseleave', this.hideHandler);
+
+    if (this.tooltip?.parentNode) {
+      this.tooltip.parentNode.removeChild(this.tooltip);
+    }
+    this.tooltip = null;
+  }
+
+  _handleWindowScroll() {
+    if (!this.tooltip) {
+      return;
+    }
+    // This wait is needed for tooltips to be positioned correctly in Firefox
+    // and Safari.
+    this.updateComplete.then(() => this._positionTooltip(this.tooltip));
+  }
+
+  // private but used in tests.
+  async _positionTooltip(tooltip: GrTooltip | null) {
+    if (tooltip === null) return;
+    const rect = this.getBoundingClientRect();
+    const boxRect = tooltip.getBoundingClientRect();
+    if (!tooltip.parentElement) {
+      return;
+    }
+    const parentRect = tooltip.parentElement.getBoundingClientRect();
+    const top = rect.top - parentRect.top;
+    const left = rect.left - parentRect.left + (rect.width - boxRect.width) / 2;
+    const right = parentRect.width - left - boxRect.width;
+    if (left < 0) {
+      tooltip.updateStyles({
+        '--gr-tooltip-arrow-center-offset': `${left}px`,
+      });
+    } else if (right < 0) {
+      tooltip.updateStyles({
+        '--gr-tooltip-arrow-center-offset': `${-0.5 * right}px`,
+      });
+    }
+    tooltip.style.left = `${Math.max(0, left)}px`;
+
+    if (!this.positionBelow) {
+      tooltip.style.top = `${Math.max(0, top)}px`;
+      tooltip.style.transform = `translateY(calc(-100% - ${BOTTOM_OFFSET}px))`;
+    } else {
+      tooltip.style.top = `${top + rect.height + BOTTOM_OFFSET}px`;
+    }
+  }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts
deleted file mode 100644
index 952420d..0000000
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_html.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style>
-    iron-icon {
-      width: var(--line-height-normal);
-      height: var(--line-height-normal);
-      vertical-align: top;
-    }
-  </style>
-  <slot></slot
-  ><!--
- --><iron-icon icon="gr-icons:info" hidden$="[[!showIcon]]"></iron-icon>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js
index f905eaa..8d3bbb0 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js
@@ -17,35 +17,162 @@
 
 import '../../../test/common-test-setup-karma.js';
 import './gr-tooltip-content.js';
-import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
 
-const basicFixture = fixtureFromTemplate(html`
-<gr-tooltip-content>
-    </gr-tooltip-content>
-`);
+const basicFixture = fixtureFromElement('gr-tooltip-content');
 
 suite('gr-tooltip-content tests', () => {
   let element;
-  setup(() => {
+
+  function makeTooltip(tooltipRect, parentRect) {
+    return {
+      getBoundingClientRect() { return tooltipRect; },
+      updateStyles: sinon.stub(),
+      style: {left: 0, top: 0},
+      parentElement: {
+        getBoundingClientRect() { return parentRect; },
+      },
+    };
+  }
+
+  setup(async () => {
     element = basicFixture.instantiate();
+    element.title = 'title';
+    await element.updateComplete;
   });
 
   test('icon is not visible by default', () => {
-    assert.equal(dom(element.root)
-        .querySelector('iron-icon').hidden, true);
+    assert.isNotOk(element.shadowRoot.querySelector('iron-icon'));
   });
 
-  test('position-below attribute is reflected', () => {
+  test('icon is visible with showIcon property', async () => {
+    element.showIcon = true;
+    await element.updateComplete;
+    assert.isOk(element.shadowRoot.querySelector('iron-icon'));
+  });
+
+  test('position-below attribute is reflected', async () => {
     assert.isFalse(element.hasAttribute('position-below'));
     element.positionBelow = true;
+    await element.updateComplete;
     assert.isTrue(element.hasAttribute('position-below'));
   });
 
-  test('icon is visible with showIcon property', () => {
-    element.showIcon = true;
-    assert.equal(dom(element.root)
-        .querySelector('iron-icon').hidden, false);
+  test('normal position', () => {
+    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
+      return {top: 100, left: 100, width: 200};
+    });
+    const tooltip = makeTooltip(
+        {height: 30, width: 50},
+        {top: 0, left: 0, width: 1000});
+
+    element._positionTooltip(tooltip);
+    assert.isFalse(tooltip.updateStyles.called);
+    assert.equal(tooltip.style.left, '175px');
+    assert.equal(tooltip.style.top, '100px');
+  });
+
+  test('left side position', () => {
+    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
+      return {top: 100, left: 10, width: 50};
+    });
+    const tooltip = makeTooltip(
+        {height: 30, width: 120},
+        {top: 0, left: 0, width: 1000});
+
+    element._positionTooltip(tooltip);
+    assert.isTrue(tooltip.updateStyles.called);
+    const offset = tooltip.updateStyles
+        .lastCall.args[0]['--gr-tooltip-arrow-center-offset'];
+    assert.isBelow(parseFloat(offset.replace(/px$/, '')), 0);
+    assert.equal(tooltip.style.left, '0px');
+    assert.equal(tooltip.style.top, '100px');
+  });
+
+  test('right side position', () => {
+    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
+      return {top: 100, left: 950, width: 50};
+    });
+    const tooltip = makeTooltip(
+        {height: 30, width: 120},
+        {top: 0, left: 0, width: 1000});
+
+    element._positionTooltip(tooltip);
+    assert.isTrue(tooltip.updateStyles.called);
+    const offset = tooltip.updateStyles
+        .lastCall.args[0]['--gr-tooltip-arrow-center-offset'];
+    assert.isAbove(parseFloat(offset.replace(/px$/, '')), 0);
+    assert.equal(tooltip.style.left, '915px');
+    assert.equal(tooltip.style.top, '100px');
+  });
+
+  test('position to bottom', () => {
+    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
+      return {top: 100, left: 950, width: 50, height: 50};
+    });
+    const tooltip = makeTooltip(
+        {height: 30, width: 120},
+        {top: 0, left: 0, width: 1000});
+
+    element.positionBelow = true;
+    element._positionTooltip(tooltip);
+    assert.isTrue(tooltip.updateStyles.called);
+    const offset = tooltip.updateStyles
+        .lastCall.args[0]['--gr-tooltip-arrow-center-offset'];
+    assert.isAbove(parseFloat(offset.replace(/px$/, '')), 0);
+    assert.equal(tooltip.style.left, '915px');
+    assert.equal(tooltip.style.top, '157.2px');
+  });
+
+  test('hides tooltip when detached', async () => {
+    sinon.stub(element, '_handleHideTooltip');
+    element.remove();
+    await element.updateComplete;
+    assert.isTrue(element._handleHideTooltip.called);
+  });
+
+  test('sets up listeners when has-tooltip is changed', async () => {
+    const addListenerStub = sinon.stub(element, 'addEventListener');
+    element.hasTooltip = true;
+    await element.updateComplete;
+    assert.isTrue(addListenerStub.called);
+  });
+
+  test('clean up listeners when has-tooltip changed to false', async () => {
+    const removeListenerStub = sinon.stub(element, 'removeEventListener');
+    element.hasTooltip = true;
+    await element.updateComplete;
+    element.hasTooltip = false;
+    await element.updateComplete;
+    assert.isTrue(removeListenerStub.called);
+  });
+
+  test('do not display tooltips on touch devices', async () => {
+    // On touch devices, tooltips should not be shown.
+    element.isTouchDevice = true;
+    await element.updateComplete;
+
+    // fire mouse-enter
+    element._handleShowTooltip();
+    await element.updateComplete;
+    assert.isNotOk(element.tooltip);
+
+    // fire mouse-enter
+    element._handleHideTooltip();
+    await element.updateComplete;
+    assert.isNotOk(element.tooltip);
+
+    // On other devices, tooltips should be shown.
+    element.isTouchDevice = false;
+
+    // fire mouse-enter
+    element._handleShowTooltip();
+    await element.updateComplete;
+    assert.isOk(element.tooltip);
+
+    // fire mouse-enter
+    element._handleHideTooltip();
+    await element.updateComplete;
+    assert.isNotOk(element.tooltip);
   });
 });
 
diff --git a/polygerrit-ui/app/elements/shared/gr-vote-chip/gr-vote-chip.ts b/polygerrit-ui/app/elements/shared/gr-vote-chip/gr-vote-chip.ts
index 73ca99d..9013088 100644
--- a/polygerrit-ui/app/elements/shared/gr-vote-chip/gr-vote-chip.ts
+++ b/polygerrit-ui/app/elements/shared/gr-vote-chip/gr-vote-chip.ts
@@ -16,7 +16,12 @@
  */
 import {LitElement, css, html} from 'lit';
 import {customElement, property} from 'lit/decorators';
-import {ApprovalInfo, LabelInfo} from '../../../api/rest-api';
+import {
+  ApprovalInfo,
+  isDetailedLabelInfo,
+  isQuickLabelInfo,
+  LabelInfo,
+} from '../../../api/rest-api';
 import {appContext} from '../../../services/app-context';
 import {KnownExperimentId} from '../../../services/flags/flags';
 import {
@@ -45,7 +50,7 @@
 
   private readonly flagsService = appContext.flagsService;
 
-  static get styles() {
+  static override get styles() {
     return [
       css`
         .vote-chip.max {
@@ -83,8 +88,8 @@
           display: flex;
           width: var(--gr-vote-chip-width, 16px);
           height: var(--gr-vote-chip-height, 16px);
+          font-size: var(--font-size-small);
           justify-content: center;
-          margin-right: var(--spacing-s);
           padding: 1px;
           border-radius: var(--border-radius);
           line-height: var(--gr-vote-chip-width, 16px);
@@ -106,25 +111,54 @@
     ];
   }
 
-  render() {
+  override render() {
     if (!this.flagsService.isEnabled(KnownExperimentId.SUBMIT_REQUIREMENTS_UI))
       return;
-    if (!this.vote?.value) return;
-    const className = this.computeClass(this.vote.value, this.label);
+
+    const renderValue = this.renderValue();
+    if (!renderValue) return;
+
     return html`<span class="container">
-      <div class="vote-chip ${className} ${this.more ? 'more' : ''}">
-        ${valueString(this.vote.value)}
+      <div class="vote-chip ${this.computeClass()} ${this.more ? 'more' : ''}">
+        ${renderValue}
       </div>
       ${this.more
-        ? html`<div class="chip-angle ${className}">
-            ${valueString(this.vote.value)}
+        ? html`<div class="chip-angle ${this.computeClass()}">
+            ${renderValue}
           </div>`
         : ''}
     </span>`;
   }
 
-  computeClass(vote: number, label?: LabelInfo) {
-    const status = getLabelStatus(label, vote);
-    return classForLabelStatus(status);
+  private renderValue() {
+    if (!this.label) {
+      return '';
+    } else if (isDetailedLabelInfo(this.label)) {
+      if (this.vote?.value) {
+        return valueString(this.vote.value);
+      }
+    } else if (isQuickLabelInfo(this.label)) {
+      if (this.label.approved) {
+        return '👍️';
+      } else if (this.label.rejected) {
+        return '👎️';
+      }
+    }
+    return '';
+  }
+
+  private computeClass() {
+    if (!this.label) {
+      return '';
+    } else if (isDetailedLabelInfo(this.label)) {
+      if (this.vote?.value) {
+        const status = getLabelStatus(this.label, this.vote.value);
+        return classForLabelStatus(status);
+      }
+    } else if (isQuickLabelInfo(this.label)) {
+      const status = getLabelStatus(this.label);
+      return classForLabelStatus(status);
+    }
+    return '';
   }
 }
diff --git a/polygerrit-ui/app/empty_test.sh b/polygerrit-ui/app/empty_test.sh
deleted file mode 100755
index e69de29..0000000
--- a/polygerrit-ui/app/empty_test.sh
+++ /dev/null
diff --git a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts b/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts
deleted file mode 100644
index 9e4608f..0000000
--- a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts
+++ /dev/null
@@ -1,118 +0,0 @@
-/**
- * @license
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import {PolymerElement} from '@polymer/polymer';
-import {Constructor} from '../../utils/common-util';
-import {property} from '@polymer/decorators';
-import {ServerInfo} from '../../types/common';
-
-/**
- * @polymer
- * @mixinFunction
- */
-export const ChangeTableMixin = <T extends Constructor<PolymerElement>>(
-  superClass: T
-) => {
-  /**
-   * @polymer
-   * @mixinClass
-   */
-  class Mixin extends superClass {
-    @property({type: Array})
-    readonly columnNames: string[] = [
-      'Subject',
-      'Status',
-      'Owner',
-      'Assignee',
-      'Reviewers',
-      'Comments',
-      'Repo',
-      'Branch',
-      'Updated',
-      'Size',
-    ];
-
-    isColumnHidden(columnToCheck?: string, columnsToDisplay?: string[]) {
-      if (!columnsToDisplay || !columnToCheck) {
-        return false;
-      }
-      return !columnsToDisplay.includes(columnToCheck);
-    }
-
-    /**
-     * Is the column disabled by a server config or experiment? For example the
-     * assignee feature might be disabled and thus the corresponding column is
-     * also disabled.
-     *
-     */
-    isColumnEnabled(column: string, config: ServerInfo, experiments: string[]) {
-      if (!config || !config.change) return true;
-      if (column === 'Assignee') return !!config.change.enable_assignee;
-      if (column === 'Comments') return experiments.includes('comments-column');
-      return true;
-    }
-
-    /**
-     * @return enabled columns, see isColumnEnabled().
-     */
-    getEnabledColumns(
-      columns: string[],
-      config: ServerInfo,
-      experiments: string[]
-    ) {
-      return columns.filter(col =>
-        this.isColumnEnabled(col, config, experiments)
-      );
-    }
-
-    /**
-     * The Project column was renamed to Repo, but some users may have
-     * preferences that use its old name. If that column is found, rename it
-     * before use.
-     *
-     * @return If the column was renamed, returns a new array
-     * with the corrected name. Otherwise, it returns the original param.
-     */
-    renameProjectToRepoColumn(columns: string[]) {
-      const projectIndex = columns.indexOf('Project');
-      if (projectIndex === -1) {
-        return columns;
-      }
-      const newColumns = [...columns];
-      newColumns[projectIndex] = 'Repo';
-      return newColumns;
-    }
-  }
-
-  return Mixin as T & Constructor<ChangeTableMixinInterface>;
-};
-
-export interface ChangeTableMixinInterface {
-  readonly columnNames: string[];
-  isColumnHidden(columnToCheck?: string, columnsToDisplay?: string[]): boolean;
-  isColumnEnabled(
-    column: string,
-    config: ServerInfo,
-    experiments: string[]
-  ): boolean;
-  getEnabledColumns(
-    columns: string[],
-    config: ServerInfo,
-    experiments: string[]
-  ): string[];
-  renameProjectToRepoColumn(columns: string[]): string[];
-}
diff --git a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js b/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js
deleted file mode 100644
index 8bc223f..0000000
--- a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js
+++ /dev/null
@@ -1,81 +0,0 @@
-/**
- * @license
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import '../../test/common-test-setup-karma.js';
-import {ChangeTableMixin} from './gr-change-table-mixin.js';
-import {PolymerElement} from '@polymer/polymer/polymer-element.js';
-
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ChangeTableMixin(PolymerElement);
-
-class GrChangeTableMixinTestElement extends base {
-  static get is() { return 'gr-change-table-mixin-test-element'; }
-}
-
-customElements.define(GrChangeTableMixinTestElement.is,
-    GrChangeTableMixinTestElement);
-
-const basicFixture = fixtureFromElement(
-    'gr-change-table-mixin-test-element');
-
-suite('gr-change-table-mixin tests', () => {
-  let element;
-
-  setup(() => {
-    element = basicFixture.instantiate();
-  });
-
-  test('isColumnHidden', () => {
-    const columnToCheck = 'Repo';
-    let columnsToDisplay = [
-      'Subject',
-      'Status',
-      'Owner',
-      'Assignee',
-      'Repo',
-      'Branch',
-      'Updated',
-      'Size',
-    ];
-    assert.isFalse(element.isColumnHidden(columnToCheck, columnsToDisplay));
-
-    columnsToDisplay = [
-      'Subject',
-      'Status',
-      'Owner',
-      'Assignee',
-      'Branch',
-      'Updated',
-      'Size',
-    ];
-    assert.isTrue(element.isColumnHidden(columnToCheck, columnsToDisplay));
-  });
-
-  test('renameProjectToRepoColumn maps Project to Repo', () => {
-    const columns = [
-      'Subject',
-      'Status',
-      'Owner',
-    ];
-    assert.deepEqual(element.renameProjectToRepoColumn(columns),
-        columns.slice(0));
-    assert.deepEqual(
-        element.renameProjectToRepoColumn(columns.concat(['Project'])),
-        columns.slice(0).concat(['Repo']));
-  });
-});
-
diff --git a/polygerrit-ui/app/mixins/gr-list-view-mixin/gr-list-view-mixin.ts b/polygerrit-ui/app/mixins/gr-list-view-mixin/gr-list-view-mixin.ts
deleted file mode 100644
index 70d212c..0000000
--- a/polygerrit-ui/app/mixins/gr-list-view-mixin/gr-list-view-mixin.ts
+++ /dev/null
@@ -1,75 +0,0 @@
-/**
- * @license
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import {encodeURL, getBaseUrl} from '../../utils/url-util';
-import {PolymerElement} from '@polymer/polymer';
-import {Constructor} from '../../utils/common-util';
-
-/**
- * @polymer
- * @mixinFunction
- */
-export const ListViewMixin = <T extends Constructor<PolymerElement>>(
-  superClass: T
-) => {
-  /**
-   * @polymer
-   * @mixinClass
-   */
-  class Mixin extends superClass {
-    computeLoadingClass(loading: boolean): string {
-      return loading ? 'loading' : '';
-    }
-
-    computeShownItems<T>(items: T[]): T[] {
-      return items.slice(0, 25);
-    }
-
-    getUrl(path: string, item: string) {
-      return getBaseUrl() + path + encodeURL(item, true);
-    }
-
-    getFilterValue<T extends ListViewParams>(params: T): string {
-      if (!params) {
-        return '';
-      }
-      return params.filter || '';
-    }
-
-    getOffsetValue<T extends ListViewParams>(params: T): number {
-      if (params?.offset) {
-        return Number(params.offset);
-      }
-      return 0;
-    }
-  }
-
-  return Mixin as T & Constructor<ListViewMixinInterface>;
-};
-
-export interface ListViewMixinInterface {
-  computeLoadingClass(loading: boolean): string;
-  computeShownItems<T>(items: T[]): T[];
-  getUrl(path: string, item: string): string;
-  getFilterValue<T extends ListViewParams>(params: T): string;
-  getOffsetValue<T extends ListViewParams>(params: T): number;
-}
-
-export interface ListViewParams {
-  filter?: string | null;
-  offset?: number | string;
-}
diff --git a/polygerrit-ui/app/mixins/gr-list-view-mixin/gr-list-view-mixin_test.js b/polygerrit-ui/app/mixins/gr-list-view-mixin/gr-list-view-mixin_test.js
deleted file mode 100644
index d2b429f..0000000
--- a/polygerrit-ui/app/mixins/gr-list-view-mixin/gr-list-view-mixin_test.js
+++ /dev/null
@@ -1,80 +0,0 @@
-/**
- * @license
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import '../../test/common-test-setup-karma.js';
-import {ListViewMixin} from './gr-list-view-mixin.js';
-import {PolymerElement} from '@polymer/polymer/polymer-element.js';
-
-const basicFixture = fixtureFromElement(
-    'gr-list-view-mixin-test-element');
-
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = ListViewMixin(PolymerElement);
-
-class GrListViewMixinTestElement extends base {
-  static get is() { return 'gr-list-view-mixin-test-element'; }
-}
-
-customElements.define(GrListViewMixinTestElement.is,
-    GrListViewMixinTestElement);
-
-suite('gr-list-view-mixin tests', () => {
-  let element;
-
-  setup(() => {
-    element = basicFixture.instantiate();
-  });
-
-  test('computeLoadingClass', () => {
-    assert.equal(element.computeLoadingClass(true), 'loading');
-    assert.equal(element.computeLoadingClass(false), '');
-  });
-
-  test('computeShownItems', () => {
-    const myArr = new Array(26);
-    assert.equal(element.computeShownItems(myArr).length, 25);
-  });
-
-  test('getUrl', () => {
-    assert.equal(element.getUrl('/path/to/something/', 'item'),
-        '/path/to/something/item');
-    assert.equal(element.getUrl('/path/to/something/', 'item%test'),
-        '/path/to/something/item%2525test');
-  });
-
-  test('getFilterValue', () => {
-    let params;
-    assert.equal(element.getFilterValue(params), '');
-
-    params = {filter: null};
-    assert.equal(element.getFilterValue(params), '');
-
-    params = {filter: 'test'};
-    assert.equal(element.getFilterValue(params), 'test');
-  });
-
-  test('getOffsetValue', () => {
-    let params;
-    assert.equal(element.getOffsetValue(params), 0);
-
-    params = {offset: null};
-    assert.equal(element.getOffsetValue(params), 0);
-
-    params = {offset: 1};
-    assert.equal(element.getOffsetValue(params), 1);
-  });
-});
-
diff --git a/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin.ts b/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin.ts
deleted file mode 100644
index 3e20d1d..0000000
--- a/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin.ts
+++ /dev/null
@@ -1,227 +0,0 @@
-/**
- * @license
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import '../../elements/shared/gr-tooltip/gr-tooltip';
-import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
-import {getRootElement} from '../../scripts/rootElement';
-import {property, observe} from '@polymer/decorators';
-import {GrTooltip} from '../../elements/shared/gr-tooltip/gr-tooltip';
-import {PolymerElement} from '@polymer/polymer';
-import {Constructor} from '../../utils/common-util';
-
-const BOTTOM_OFFSET = 7.2; // Height of the arrow in tooltip.
-
-/** The interface corresponding to TooltipMixin */
-export interface TooltipMixinInterface {
-  hasTooltip: boolean;
-  positionBelow: boolean;
-  _isTouchDevice: boolean;
-  _tooltip: GrTooltip | null;
-  _titleText: string;
-  _hasSetupTooltipListeners: boolean;
-}
-
-/**
- * @polymer
- * @mixinFunction
- */
-export const TooltipMixin = <T extends Constructor<PolymerElement>>(
-  superClass: T
-) => {
-  /**
-   * @polymer
-   * @mixinClass
-   */
-  class Mixin extends superClass {
-    @property({type: Boolean})
-    hasTooltip = false;
-
-    @property({type: Boolean, reflectToAttribute: true})
-    positionBelow = false;
-
-    @property({type: Boolean})
-    _isTouchDevice = 'ontouchstart' in document.documentElement;
-
-    @property({type: Object})
-    _tooltip: GrTooltip | null = null;
-
-    @property({type: String})
-    _titleText = '';
-
-    @property({type: Boolean})
-    _hasSetupTooltipListeners = false;
-
-    // Handler for mouseenter event
-    private mouseenterHandler?: (e: MouseEvent) => void;
-
-    // Handler for scrolling on window
-    private readonly windowScrollHandler: () => void;
-
-    // Handler for showing the tooltip, will be attached to certain events
-    private readonly showHandler: () => void;
-
-    // Handler for hiding the tooltip, will be attached to certain events
-    private readonly hideHandler: (e: Event) => void;
-
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any
-    constructor(..._: any[]) {
-      super();
-      this.windowScrollHandler = () => this._handleWindowScroll();
-      this.showHandler = () => this._handleShowTooltip();
-      this.hideHandler = (e: Event | undefined) => this._handleHideTooltip(e);
-    }
-
-    override disconnectedCallback() {
-      // NOTE: if you define your own `detached` in your component
-      // then this won't take affect (as its not a class yet)
-      this._handleHideTooltip(undefined);
-      if (this.mouseenterHandler) {
-        this.removeEventListener('mouseenter', this.mouseenterHandler);
-      }
-      window.removeEventListener('scroll', this.windowScrollHandler);
-      super.disconnectedCallback();
-    }
-
-    @observe('hasTooltip')
-    _setupTooltipListeners() {
-      if (!this.mouseenterHandler) {
-        this.mouseenterHandler = this.showHandler;
-      }
-
-      if (!this.hasTooltip) {
-        // if attribute set to false, remove the listener
-        this.removeEventListener('mouseenter', this.mouseenterHandler);
-        this._hasSetupTooltipListeners = false;
-        return;
-      }
-
-      if (this._hasSetupTooltipListeners) {
-        return;
-      }
-      this._hasSetupTooltipListeners = true;
-
-      this.addEventListener('mouseenter', this.mouseenterHandler);
-    }
-
-    _handleShowTooltip() {
-      if (this._isTouchDevice) {
-        return;
-      }
-
-      if (
-        !this.hasAttribute('title') ||
-        this.getAttribute('title') === '' ||
-        this._tooltip
-      ) {
-        return;
-      }
-
-      // Store the title attribute text then set it to an empty string to
-      // prevent it from showing natively.
-      this._titleText = this.getAttribute('title') || '';
-      this.setAttribute('title', '');
-
-      const tooltip = document.createElement('gr-tooltip');
-      tooltip.text = this._titleText;
-      tooltip.maxWidth = this.getAttribute('max-width') || '';
-      tooltip.positionBelow = this.hasAttribute('position-below');
-
-      // Set visibility to hidden before appending to the DOM so that
-      // calculations can be made based on the element’s size.
-      tooltip.style.visibility = 'hidden';
-      getRootElement().appendChild(tooltip);
-      this._positionTooltip(tooltip);
-      tooltip.style.visibility = 'initial';
-
-      this._tooltip = tooltip;
-      window.addEventListener('scroll', this.windowScrollHandler);
-      this.addEventListener('mouseleave', this.hideHandler);
-      this.addEventListener('click', this.hideHandler);
-      tooltip.addEventListener('mouseleave', this.hideHandler);
-    }
-
-    _handleHideTooltip(e: Event | undefined) {
-      if (this._isTouchDevice) {
-        return;
-      }
-      if (!this.hasAttribute('title') || !this._titleText) {
-        return;
-      }
-      // Do not hide if mouse left this or this._tooltip and came to this or
-      // this._tooltip
-      if (
-        (e as MouseEvent)?.relatedTarget === this._tooltip ||
-        (e as MouseEvent)?.relatedTarget === this
-      ) {
-        return;
-      }
-
-      window.removeEventListener('scroll', this.windowScrollHandler);
-      this.removeEventListener('mouseleave', this.hideHandler);
-      this.removeEventListener('click', this.hideHandler);
-      this.setAttribute('title', this._titleText);
-      this._tooltip?.removeEventListener('mouseleave', this.hideHandler);
-
-      if (this._tooltip?.parentNode) {
-        this._tooltip.parentNode.removeChild(this._tooltip);
-      }
-      this._tooltip = null;
-    }
-
-    _handleWindowScroll() {
-      if (!this._tooltip) {
-        return;
-      }
-
-      this._positionTooltip(this._tooltip);
-    }
-
-    _positionTooltip(tooltip: GrTooltip) {
-      // This flush is needed for tooltips to be positioned correctly in Firefox
-      // and Safari.
-      flush();
-      const rect = this.getBoundingClientRect();
-      const boxRect = tooltip.getBoundingClientRect();
-      if (!tooltip.parentElement) {
-        return;
-      }
-      const parentRect = tooltip.parentElement.getBoundingClientRect();
-      const top = rect.top - parentRect.top;
-      const left =
-        rect.left - parentRect.left + (rect.width - boxRect.width) / 2;
-      const right = parentRect.width - left - boxRect.width;
-      if (left < 0) {
-        tooltip.updateStyles({
-          '--gr-tooltip-arrow-center-offset': `${left}px`,
-        });
-      } else if (right < 0) {
-        tooltip.updateStyles({
-          '--gr-tooltip-arrow-center-offset': `${-0.5 * right}px`,
-        });
-      }
-      tooltip.style.left = `${Math.max(0, left)}px`;
-
-      if (!this.positionBelow) {
-        tooltip.style.top = `${Math.max(0, top)}px`;
-        tooltip.style.transform = `translateY(calc(-100% - ${BOTTOM_OFFSET}px))`;
-      } else {
-        tooltip.style.top = `${top + rect.height + BOTTOM_OFFSET}px`;
-      }
-    }
-  }
-
-  return Mixin as T & Constructor<TooltipMixinInterface>;
-};
diff --git a/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin_test.js b/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin_test.js
deleted file mode 100644
index 69e6e86..0000000
--- a/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin_test.js
+++ /dev/null
@@ -1,140 +0,0 @@
-/**
- * @license
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import '../../test/common-test-setup-karma.js';
-import {PolymerElement} from '@polymer/polymer/polymer-element.js';
-import {TooltipMixin} from './gr-tooltip-mixin.js';
-
-const basicFixture = fixtureFromElement('gr-tooltip-mixin-element');
-
-// This avoids JSC_DYNAMIC_EXTENDS_WITHOUT_JSDOC closure compiler error.
-const base = TooltipMixin(PolymerElement);
-
-class GrTooltipMixinTestElement extends base {
-  static get is() {
-    return 'gr-tooltip-mixin-element';
-  }
-}
-
-customElements.define(GrTooltipMixinTestElement.is,
-    GrTooltipMixinTestElement);
-
-suite('gr-tooltip-mixin tests', () => {
-  let element;
-
-  function makeTooltip(tooltipRect, parentRect) {
-    return {
-      getBoundingClientRect() { return tooltipRect; },
-      updateStyles: sinon.stub(),
-      style: {left: 0, top: 0},
-      parentElement: {
-        getBoundingClientRect() { return parentRect; },
-      },
-    };
-  }
-
-  setup(() => {
-    element = basicFixture.instantiate();
-  });
-
-  test('normal position', () => {
-    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
-      return {top: 100, left: 100, width: 200};
-    });
-    const tooltip = makeTooltip(
-        {height: 30, width: 50},
-        {top: 0, left: 0, width: 1000});
-
-    element._positionTooltip(tooltip);
-    assert.isFalse(tooltip.updateStyles.called);
-    assert.equal(tooltip.style.left, '175px');
-    assert.equal(tooltip.style.top, '100px');
-  });
-
-  test('left side position', () => {
-    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
-      return {top: 100, left: 10, width: 50};
-    });
-    const tooltip = makeTooltip(
-        {height: 30, width: 120},
-        {top: 0, left: 0, width: 1000});
-
-    element._positionTooltip(tooltip);
-    assert.isTrue(tooltip.updateStyles.called);
-    const offset = tooltip.updateStyles
-        .lastCall.args[0]['--gr-tooltip-arrow-center-offset'];
-    assert.isBelow(parseFloat(offset.replace(/px$/, '')), 0);
-    assert.equal(tooltip.style.left, '0px');
-    assert.equal(tooltip.style.top, '100px');
-  });
-
-  test('right side position', () => {
-    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
-      return {top: 100, left: 950, width: 50};
-    });
-    const tooltip = makeTooltip(
-        {height: 30, width: 120},
-        {top: 0, left: 0, width: 1000});
-
-    element._positionTooltip(tooltip);
-    assert.isTrue(tooltip.updateStyles.called);
-    const offset = tooltip.updateStyles
-        .lastCall.args[0]['--gr-tooltip-arrow-center-offset'];
-    assert.isAbove(parseFloat(offset.replace(/px$/, '')), 0);
-    assert.equal(tooltip.style.left, '915px');
-    assert.equal(tooltip.style.top, '100px');
-  });
-
-  test('position to bottom', () => {
-    sinon.stub(element, 'getBoundingClientRect').callsFake(() => {
-      return {top: 100, left: 950, width: 50, height: 50};
-    });
-    const tooltip = makeTooltip(
-        {height: 30, width: 120},
-        {top: 0, left: 0, width: 1000});
-
-    element.positionBelow = true;
-    element._positionTooltip(tooltip);
-    assert.isTrue(tooltip.updateStyles.called);
-    const offset = tooltip.updateStyles
-        .lastCall.args[0]['--gr-tooltip-arrow-center-offset'];
-    assert.isAbove(parseFloat(offset.replace(/px$/, '')), 0);
-    assert.equal(tooltip.style.left, '915px');
-    assert.equal(tooltip.style.top, '157.2px');
-  });
-
-  test('hides tooltip when detached', () => {
-    sinon.stub(element, '_handleHideTooltip');
-    element.remove();
-    flush();
-    assert.isTrue(element._handleHideTooltip.called);
-  });
-
-  test('sets up listeners when has-tooltip is changed', () => {
-    const addListenerStub = sinon.stub(element, 'addEventListener');
-    element.hasTooltip = true;
-    assert.isTrue(addListenerStub.called);
-  });
-
-  test('clean up listeners when has-tooltip changed to false', () => {
-    const removeListenerStub = sinon.stub(element, 'removeEventListener');
-    element.hasTooltip = true;
-    element.hasTooltip = false;
-    assert.isTrue(removeListenerStub.called);
-  });
-});
-
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts b/polygerrit-ui/app/mixins/hovercard-mixin/hovercard-mixin.ts
similarity index 81%
rename from polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
rename to polygerrit-ui/app/mixins/hovercard-mixin/hovercard-mixin.ts
index 2bb9de5..793e5d6 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
+++ b/polygerrit-ui/app/mixins/hovercard-mixin/hovercard-mixin.ts
@@ -14,18 +14,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../../styles/shared-styles';
-import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
-import {getRootElement} from '../../../scripts/rootElement';
-import {Constructor} from '../../../utils/common-util';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {property, observe} from '@polymer/decorators';
-import {
-  pushScrollLock,
-  removeScrollLock,
-} from '@polymer/iron-overlay-behavior/iron-scroll-manager';
-import {ShowAlertEventDetail} from '../../../types/events';
-import {debounce, DelayedTask} from '../../../utils/async-util';
+import {getRootElement} from '../../scripts/rootElement';
+import {Constructor} from '../../utils/common-util';
+import {LitElement, PropertyValues} from 'lit';
+import {property, query} from 'lit/decorators';
+import {ShowAlertEventDetail} from '../../types/events';
+import {debounce, DelayedTask} from '../../utils/async-util';
+import {hovercardStyles} from '../../styles/gr-hovercard-styles';
+import {sharedStyles} from '../../styles/shared-styles';
+
 interface ReloadEventDetail {
   clearPatchset?: boolean;
 }
@@ -68,27 +65,30 @@
 const HIDE_DELAY_MS = 500;
 
 /**
- * The mixin for gr-hovercard-behavior.
+ * The mixin for hovercard behavior.
  *
  * @example
  *
  * class YourComponent extends hovercardBehaviorMixin(
- *  PolymerElement
+ *  LitElement)
  *
  * @see gr-hovercard.ts
  *
  * // following annotations are required for polylint
- * @polymer
+ * @lit
  * @mixinFunction
  */
-export const HovercardBehaviorMixin = <T extends Constructor<PolymerElement>>(
+export const HovercardMixin = <T extends Constructor<LitElement>>(
   superClass: T
 ) => {
   /**
-   * @polymer
+   * @lit
    * @mixinClass
    */
   class Mixin extends superClass {
+    @query('#container')
+    topElement?: HTMLElement;
+
     @property({type: Object})
     _target: HTMLElement | null = null;
 
@@ -117,50 +117,56 @@
     @property({type: Object})
     container: HTMLElement | null = null;
 
-    private hideTask?: DelayedTask;
+    // Private but used in tests.
+    hideTask?: DelayedTask;
 
-    private showTask?: DelayedTask;
+    showTask?: DelayedTask;
 
-    private isScheduledToShow?: boolean;
+    isScheduledToShow?: boolean;
 
-    private isScheduledToHide?: boolean;
+    isScheduledToHide?: boolean;
 
-    override connectedCallback() {
-      super.connectedCallback();
-      if (!this._target) {
-        this._target = this.target;
-      }
-      this._target.addEventListener('mouseenter', this.debounceShow);
-      this._target.addEventListener('focus', this.debounceShow);
-      this._target.addEventListener('mouseleave', this.debounceHide);
-      this._target.addEventListener('blur', this.debounceHide);
+    static get styles() {
+      return [sharedStyles, hovercardStyles];
+    }
 
-      // when click, dismiss immediately
-      this._target.addEventListener('click', this.hide);
-
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    constructor(...args: any[]) {
+      super(...args);
       // show the hovercard if mouse moves to hovercard
       // this will cancel pending hide as well
       this.addEventListener('mouseenter', this.show);
-      this.addEventListener('mouseenter', this.lock);
       // when leave hovercard, hide it immediately
       this.addEventListener('mouseleave', this.hide);
-      this.addEventListener('mouseleave', this.unlock);
+    }
+
+    override connectedCallback() {
+      super.connectedCallback();
+      // We have to cache the target because when we this.container.appendChild
+      // in show we can not pick the container as target when we reconnect.
+      if (!this._target) {
+        this._target = this.target;
+        this.addTargetEventListeners();
+      }
+
+      this.container = getHovercardContainer({createIfNotExists: true});
     }
 
     override disconnectedCallback() {
       this.cancelShowTask();
       this.cancelHideTask();
-      this.unlock();
       super.disconnectedCallback();
     }
 
-    override ready() {
-      super.ready();
-      // First, check to see if the container has already been created.
-      this.container = getHovercardContainer({createIfNotExists: true});
+    private addTargetEventListeners() {
+      this._target?.addEventListener('mouseenter', this.debounceShow);
+      this._target?.addEventListener('focus', this.debounceShow);
+      this._target?.addEventListener('mouseleave', this.debounceHide);
+      this._target?.addEventListener('blur', this.debounceHide);
+      this._target?.addEventListener('click', this.hide);
     }
 
-    removeListeners() {
+    private removeTargetEventListeners() {
       this._target?.removeEventListener('mouseenter', this.debounceShow);
       this._target?.removeEventListener('focus', this.debounceShow);
       this._target?.removeEventListener('mouseleave', this.debounceHide);
@@ -168,6 +174,19 @@
       this._target?.removeEventListener('click', this.hide);
     }
 
+    /**
+     * Responds to a change in the `for` value and gets the updated `target`
+     * element for the hovercard.
+     */
+    override updated(changedProperties: PropertyValues) {
+      super.updated(changedProperties);
+      if (changedProperties.has('for')) {
+        this.removeTargetEventListeners();
+        this._target = this.target;
+        this.addTargetEventListeners();
+      }
+    }
+
     readonly debounceHide = () => {
       this.cancelShowTask();
       if (!this._isShowing || this.isScheduledToHide) return;
@@ -185,10 +204,10 @@
     };
 
     cancelHideTask() {
-      if (this.hideTask) {
-        this.hideTask.cancel();
-        this.isScheduledToHide = false;
-      }
+      if (!this.hideTask) return;
+      this.hideTask.cancel();
+      this.isScheduledToHide = false;
+      this.hideTask = undefined;
     }
 
     /**
@@ -241,13 +260,6 @@
     }
 
     /**
-     * unlock scroll, this will resume the scroll outside of the hovercard.
-     */
-    readonly unlock = () => {
-      removeScrollLock(this);
-    };
-
-    /**
      * Hides/closes the hovercard. This occurs when the user triggers the
      * `mouseleave` event on the hovercard's `target` element (as long as the
      * user is not hovering over the hovercard).
@@ -280,7 +292,7 @@
 
       // Reset and remove the hovercard from the DOM
       this.style.cssText = '';
-      this.$['container'].setAttribute('tabindex', '-1');
+      this.topElement?.setAttribute('tabindex', '-1');
 
       // Remove the hovercard from the container, given that it is still a child
       // of the container.
@@ -315,24 +327,17 @@
     }
 
     cancelShowTask() {
-      if (this.showTask) {
-        this.showTask.cancel();
-        this.isScheduledToShow = false;
-      }
+      if (!this.showTask) return;
+      this.showTask.cancel();
+      this.isScheduledToShow = false;
+      this.showTask = undefined;
     }
 
     /**
-     * Lock background scroll but enable scroll inside of current hovercard.
-     */
-    readonly lock = () => {
-      pushScrollLock(this);
-    };
-
-    /**
      * Shows/opens the hovercard. This occurs when the user triggers the
      * `mousenter` event on the hovercard's `target` element.
      */
-    readonly show = () => {
+    readonly show = async () => {
       this.cancelHideTask();
       this.cancelShowTask();
       if (this._isShowing || !this.container) {
@@ -352,7 +357,9 @@
       // Make sure that the hovercard actually rendered and all dom-if
       // statements processed, so that we can measure the (invisible)
       // hovercard properly in updatePosition().
-      flush();
+      await new Promise<void>(r => {
+        setTimeout(r, 0);
+      });
       this.updatePosition();
       this.classList.remove(HIDE_CLASS);
     };
@@ -455,31 +462,27 @@
       this.style.left = `${hovercardLeft}px`;
       this.style.top = `${hovercardTop}px`;
     }
-
-    /**
-     * Responds to a change in the `for` value and gets the updated `target`
-     * element for the hovercard.
-     */
-    @observe('for')
-    _forChanged() {
-      this._target = this.target;
-    }
   }
 
-  return Mixin as T & Constructor<GrHovercardBehaviorInterface>;
+  return Mixin as T & Constructor<HovercardMixinInterface>;
 };
 
-export interface GrHovercardBehaviorInterface {
-  ready(): void;
-  removeListeners(): void;
-  debounceHide(): void;
-  cancelHideTask(): void;
+export interface HovercardMixinInterface {
+  for?: string;
+  offset: number;
+  _target: HTMLElement | null;
+  _isShowing: boolean;
   dispatchEventThroughTarget(eventName: string, detail?: unknown): void;
-  hide(e?: MouseEvent): void;
-  debounceShow(): void;
-  debounceShowBy(delayMs: number): void;
-  cancelShowTask(): void;
   show(): void;
+
+  // Used for tests
+  hide(e: MouseEvent): void;
+  container: HTMLElement | null;
+  hideTask?: DelayedTask;
+  showTask?: DelayedTask;
+  position: string;
+  debounceShowBy(delayMs: number): void;
   updatePosition(): void;
-  updatePositionTo(position: string): void;
+  isScheduledToShow?: boolean;
+  isScheduledToHide?: boolean;
 }
diff --git a/polygerrit-ui/app/mixins/hovercard-mixin/hovercard-mixin_test.ts b/polygerrit-ui/app/mixins/hovercard-mixin/hovercard-mixin_test.ts
new file mode 100644
index 0000000..bd12789
--- /dev/null
+++ b/polygerrit-ui/app/mixins/hovercard-mixin/hovercard-mixin_test.ts
@@ -0,0 +1,177 @@
+/**
+ * @license
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import '../../test/common-test-setup-karma.js';
+import {HovercardMixin} from './hovercard-mixin.js';
+import {html, LitElement} from 'lit';
+import {customElement} from 'lit/decorators';
+import {MockPromise, mockPromise} from '../../test/test-utils.js';
+
+const base = HovercardMixin(LitElement);
+
+declare global {
+  interface HTMLElementTagNameMap {
+    'hovercard-mixin-test': HovercardMixinTest;
+  }
+}
+
+@customElement('hovercard-mixin-test')
+class HovercardMixinTest extends base {
+  constructor() {
+    super();
+    this.for = 'foo';
+  }
+
+  override render() {
+    return html`<div id="container"><slot></slot></div>`;
+  }
+}
+
+const basicFixture = fixtureFromElement('hovercard-mixin-test');
+
+suite('gr-hovercard tests', () => {
+  let element: HovercardMixinTest;
+
+  let button: HTMLElement;
+  let testPromise: MockPromise;
+
+  setup(() => {
+    testPromise = mockPromise();
+    button = document.createElement('button');
+    button.innerHTML = 'Hello';
+    button.setAttribute('id', 'foo');
+    document.body.appendChild(button);
+
+    element = basicFixture.instantiate();
+  });
+
+  teardown(() => {
+    element.hide(new MouseEvent('click'));
+    button?.remove();
+  });
+
+  test('updatePosition', async () => {
+    // Test that the correct style properties have at least been set.
+    element.position = 'bottom';
+    element.updatePosition();
+    await element.updateComplete;
+    assert.typeOf(element.style.getPropertyValue('left'), 'string');
+    assert.typeOf(element.style.getPropertyValue('top'), 'string');
+    assert.typeOf(element.style.getPropertyValue('paddingTop'), 'string');
+    assert.typeOf(element.style.getPropertyValue('marginTop'), 'string');
+
+    const parentRect = document.documentElement.getBoundingClientRect();
+    const targetRect = element!._target!.getBoundingClientRect();
+    const thisRect = element.getBoundingClientRect();
+
+    const targetLeft = targetRect.left - parentRect.left;
+    const targetTop = targetRect.top - parentRect.top;
+
+    const pixelCompare = (pixel: string) =>
+      Math.round(parseInt(pixel.substring(0, pixel.length - 1), 10));
+
+    assert.equal(
+      pixelCompare(element.style.left),
+      pixelCompare(`${targetLeft + (targetRect.width - thisRect.width) / 2}px`)
+    );
+    assert.equal(
+      pixelCompare(element.style.top),
+      pixelCompare(`${targetTop + targetRect.height + element.offset}px`)
+    );
+  });
+
+  test('hide', () => {
+    element.hide(new MouseEvent('click'));
+    const style = getComputedStyle(element);
+    assert.isFalse(element._isShowing);
+    assert.isFalse(element.classList.contains('hovered'));
+    assert.equal(style.display, 'none');
+    assert.notEqual(element.container, element.parentNode);
+  });
+
+  test('show', async () => {
+    await element.show();
+    await element.updateComplete;
+    const style = getComputedStyle(element);
+    assert.isTrue(element._isShowing);
+    assert.isTrue(element.classList.contains('hovered'));
+    assert.equal(style.opacity, '1');
+    assert.equal(style.visibility, 'visible');
+  });
+
+  test('debounceShow does not show immediately', async () => {
+    element.debounceShowBy(100);
+    setTimeout(() => testPromise.resolve(), 0);
+    await testPromise;
+    assert.isFalse(element._isShowing);
+  });
+
+  test('debounceShow shows after delay', async () => {
+    element.debounceShowBy(1);
+    setTimeout(() => testPromise.resolve(), 10);
+    await testPromise;
+    assert.isTrue(element._isShowing);
+  });
+
+  test('card is scheduled to show on enter and hides on leave', async () => {
+    const button = document.querySelector('button');
+    const enterPromise = mockPromise();
+    button!.addEventListener('mouseenter', () => enterPromise.resolve());
+    const leavePromise = mockPromise();
+    button!.addEventListener('mouseleave', () => leavePromise.resolve());
+
+    assert.isFalse(element._isShowing);
+    button!.dispatchEvent(new CustomEvent('mouseenter'));
+
+    await enterPromise;
+    await flush();
+    assert.isTrue(element.isScheduledToShow);
+    element!.showTask!.flush();
+    assert.isTrue(element._isShowing);
+    assert.isFalse(element.isScheduledToShow);
+
+    button!.dispatchEvent(new CustomEvent('mouseleave'));
+
+    await leavePromise;
+    assert.isTrue(element.isScheduledToHide);
+    assert.isTrue(element._isShowing);
+    element!.hideTask!.flush();
+    assert.isFalse(element.isScheduledToShow);
+    assert.isFalse(element._isShowing);
+  });
+
+  test('card should disappear on click', async () => {
+    const button = document.querySelector('button');
+    const enterPromise = mockPromise();
+    const clickPromise = mockPromise();
+    button!.addEventListener('mouseenter', () => enterPromise.resolve());
+    button!.addEventListener('click', () => clickPromise.resolve());
+
+    assert.isFalse(element._isShowing);
+
+    button!.dispatchEvent(new CustomEvent('mouseenter'));
+
+    await enterPromise;
+    await flush();
+    assert.isTrue(element.isScheduledToShow);
+    button!.click();
+
+    await clickPromise;
+    assert.isFalse(element.isScheduledToShow);
+    assert.isFalse(element._isShowing);
+  });
+});
diff --git a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts
index 5c4c9ce..3d1e120 100644
--- a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts
+++ b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts
@@ -14,104 +14,31 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/*
-
-How to Add a Keyboard Shortcut
-==============================
-
-A keyboard shortcut is composed of the following parts:
-
-  1. A semantic identifier (e.g. OPEN_CHANGE, NEXT_PAGE)
-  2. Documentation for the keyboard shortcut help dialog
-  3. A binding between key combos and the semantic identifier
-  4. A binding between the semantic identifier and a listener
-
-Parts (1) and (2) for all shortcuts are defined in this file. The semantic
-identifier is declared in the Shortcut enum near the head of this script:
-
-  const Shortcut = {
-    // ...
-    TOGGLE_LEFT_PANE: 'TOGGLE_LEFT_PANE',
-    // ...
-  };
-
-Immediately following the Shortcut enum definition, there is a _describe
-function defined which is then invoked many times to populate the help dialog.
-Add a new invocation here to document the shortcut:
-
-  _describe(Shortcut.TOGGLE_LEFT_PANE, ShortcutSection.DIFFS,
-      'Hide/show left diff');
-
-When an attached view binds one or more key combos to this shortcut, the help
-dialog will display this text in the given section (in this case, "Diffs"). See
-the ShortcutSection enum immediately below for the list of supported sections.
-
-Part (3), the actual key bindings, are declared by gr-app. In the future, this
-system may be expanded to allow key binding customizations by plugins or user
-preferences. Key bindings are defined in the following forms:
-
-  // Ordinary shortcut with a single binding.
-  this.bindShortcut(
-      Shortcut.TOGGLE_LEFT_PANE, 'shift+a');
-
-  // Ordinary shortcut with multiple bindings.
-  this.bindShortcut(
-      Shortcut.CURSOR_NEXT_FILE, 'j', 'down');
-
-  // A "go-key" keyboard shortcut, which is combined with a previously and
-  // continuously pressed "go" key (the go-key is hard-coded as 'g').
-  this.bindShortcut(
-      Shortcut.GO_TO_OPENED_CHANGES, SPECIAL_SHORTCUT.GO_KEY, 'o');
-
-  // A "doc-only" keyboard shortcut. This declares the key-binding for help
-  // dialog purposes, but doesn't actually implement the binding. It is up
-  // to some element to implement this binding using iron-a11y-keys-behavior's
-  // keyBindings property.
-  this.bindShortcut(
-      Shortcut.EXPAND_ALL_COMMENT_THREADS, SPECIAL_SHORTCUT.DOC_ONLY, 'e');
-
-Part (4), the listener definitions, are declared by the view or element that
-implements the shortcut behavior. This is done by implementing a method named
-keyboardShortcuts() in an element that mixes in this behavior, returning an
-object that maps semantic identifiers (as property names) to listener method
-names, like this:
-
-  keyboardShortcuts() {
-    return {
-      [Shortcut.TOGGLE_LEFT_PANE]: '_handleToggleLeftPane',
-    };
-  },
-
-You can implement key bindings in an element that is hosted by a view IF that
-element is always attached exactly once under that view (e.g. the search bar in
-gr-app). When that is not the case, you will have to define a doc-only binding
-in gr-app, declare the shortcut in the view that hosts the element, and use
-iron-a11y-keys-behavior's keyBindings attribute to implement the binding in the
-element. An example of this is in comment threads. A diff view supports actions
-on comment threads, but there may be zero or many comment threads attached at
-any given point. So the shortcut is declared as doc-only by the diff view and
-by gr-app, and actually implemented by gr-comment-thread.
-
-NOTE: doc-only shortcuts will not be customizable in the same way that other
-shortcuts are.
-*/
-
 import {IronA11yKeysBehavior} from '@polymer/iron-a11y-keys-behavior/iron-a11y-keys-behavior';
-import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class';
 import {property} from '@polymer/decorators';
 import {PolymerElement} from '@polymer/polymer';
 import {check, Constructor} from '../../utils/common-util';
-import {getKeyboardEvent, isModifierPressed} from '../../utils/dom-util';
-import {CustomKeyboardEvent} from '../../types/events';
+import {isModifierPressed} from '../../utils/dom-util';
+import {IronKeyboardEvent} from '../../types/events';
 import {appContext} from '../../services/app-context';
+import {
+  Shortcut,
+  ShortcutSection,
+  SPECIAL_SHORTCUT,
+} from '../../services/shortcuts/shortcuts-config';
+import {
+  ShortcutListener,
+  SectionView,
+} from '../../services/shortcuts/shortcuts-service';
 
-/** Enum for all special shortcuts */
-export enum SPECIAL_SHORTCUT {
-  DOC_ONLY = 'DOC_ONLY',
-  GO_KEY = 'GO_KEY',
-  V_KEY = 'V_KEY',
-}
+export {
+  Shortcut,
+  ShortcutSection,
+  SPECIAL_SHORTCUT,
+  ShortcutListener,
+  SectionView,
+};
 
 // The maximum age of a keydown event to be used in a jump navigation. This
 // is only for cases when the keyup event is lost.
@@ -119,625 +46,6 @@
 
 const V_KEY_TIMEOUT_MS = 1000;
 
-/**
- * Enum for all shortcut sections, where that shortcut should be applied to.
- */
-export enum ShortcutSection {
-  ACTIONS = 'Actions',
-  DIFFS = 'Diffs',
-  EVERYWHERE = 'Global Shortcuts',
-  FILE_LIST = 'File list',
-  NAVIGATION = 'Navigation',
-  REPLY_DIALOG = 'Reply dialog',
-}
-
-/**
- * Enum for all possible shortcut names.
- */
-export enum Shortcut {
-  OPEN_SHORTCUT_HELP_DIALOG = 'OPEN_SHORTCUT_HELP_DIALOG',
-  GO_TO_USER_DASHBOARD = 'GO_TO_USER_DASHBOARD',
-  GO_TO_OPENED_CHANGES = 'GO_TO_OPENED_CHANGES',
-  GO_TO_MERGED_CHANGES = 'GO_TO_MERGED_CHANGES',
-  GO_TO_ABANDONED_CHANGES = 'GO_TO_ABANDONED_CHANGES',
-  GO_TO_WATCHED_CHANGES = 'GO_TO_WATCHED_CHANGES',
-
-  CURSOR_NEXT_CHANGE = 'CURSOR_NEXT_CHANGE',
-  CURSOR_PREV_CHANGE = 'CURSOR_PREV_CHANGE',
-  OPEN_CHANGE = 'OPEN_CHANGE',
-  NEXT_PAGE = 'NEXT_PAGE',
-  PREV_PAGE = 'PREV_PAGE',
-  TOGGLE_CHANGE_REVIEWED = 'TOGGLE_CHANGE_REVIEWED',
-  TOGGLE_CHANGE_STAR = 'TOGGLE_CHANGE_STAR',
-  REFRESH_CHANGE_LIST = 'REFRESH_CHANGE_LIST',
-  OPEN_SUBMIT_DIALOG = 'OPEN_SUBMIT_DIALOG',
-
-  OPEN_REPLY_DIALOG = 'OPEN_REPLY_DIALOG',
-  OPEN_DOWNLOAD_DIALOG = 'OPEN_DOWNLOAD_DIALOG',
-  EXPAND_ALL_MESSAGES = 'EXPAND_ALL_MESSAGES',
-  COLLAPSE_ALL_MESSAGES = 'COLLAPSE_ALL_MESSAGES',
-  UP_TO_DASHBOARD = 'UP_TO_DASHBOARD',
-  UP_TO_CHANGE = 'UP_TO_CHANGE',
-  TOGGLE_DIFF_MODE = 'TOGGLE_DIFF_MODE',
-  REFRESH_CHANGE = 'REFRESH_CHANGE',
-  EDIT_TOPIC = 'EDIT_TOPIC',
-  DIFF_AGAINST_BASE = 'DIFF_AGAINST_BASE',
-  DIFF_AGAINST_LATEST = 'DIFF_AGAINST_LATEST',
-  DIFF_BASE_AGAINST_LEFT = 'DIFF_BASE_AGAINST_LEFT',
-  DIFF_RIGHT_AGAINST_LATEST = 'DIFF_RIGHT_AGAINST_LATEST',
-  DIFF_BASE_AGAINST_LATEST = 'DIFF_BASE_AGAINST_LATEST',
-
-  NEXT_LINE = 'NEXT_LINE',
-  PREV_LINE = 'PREV_LINE',
-  VISIBLE_LINE = 'VISIBLE_LINE',
-  NEXT_CHUNK = 'NEXT_CHUNK',
-  PREV_CHUNK = 'PREV_CHUNK',
-  TOGGLE_ALL_DIFF_CONTEXT = 'TOGGLE_ALL_DIFF_CONTEXT',
-  NEXT_COMMENT_THREAD = 'NEXT_COMMENT_THREAD',
-  PREV_COMMENT_THREAD = 'PREV_COMMENT_THREAD',
-  EXPAND_ALL_COMMENT_THREADS = 'EXPAND_ALL_COMMENT_THREADS',
-  COLLAPSE_ALL_COMMENT_THREADS = 'COLLAPSE_ALL_COMMENT_THREADS',
-  LEFT_PANE = 'LEFT_PANE',
-  RIGHT_PANE = 'RIGHT_PANE',
-  TOGGLE_LEFT_PANE = 'TOGGLE_LEFT_PANE',
-  NEW_COMMENT = 'NEW_COMMENT',
-  SAVE_COMMENT = 'SAVE_COMMENT',
-  OPEN_DIFF_PREFS = 'OPEN_DIFF_PREFS',
-  TOGGLE_DIFF_REVIEWED = 'TOGGLE_DIFF_REVIEWED',
-
-  NEXT_FILE = 'NEXT_FILE',
-  PREV_FILE = 'PREV_FILE',
-  NEXT_FILE_WITH_COMMENTS = 'NEXT_FILE_WITH_COMMENTS',
-  PREV_FILE_WITH_COMMENTS = 'PREV_FILE_WITH_COMMENTS',
-  NEXT_UNREVIEWED_FILE = 'NEXT_UNREVIEWED_FILE',
-  CURSOR_NEXT_FILE = 'CURSOR_NEXT_FILE',
-  CURSOR_PREV_FILE = 'CURSOR_PREV_FILE',
-  OPEN_FILE = 'OPEN_FILE',
-  TOGGLE_FILE_REVIEWED = 'TOGGLE_FILE_REVIEWED',
-  TOGGLE_ALL_INLINE_DIFFS = 'TOGGLE_ALL_INLINE_DIFFS',
-  TOGGLE_INLINE_DIFF = 'TOGGLE_INLINE_DIFF',
-  TOGGLE_HIDE_ALL_COMMENT_THREADS = 'TOGGLE_HIDE_ALL_COMMENT_THREADS',
-  OPEN_FILE_LIST = 'OPEN_FILE_LIST',
-
-  OPEN_FIRST_FILE = 'OPEN_FIRST_FILE',
-  OPEN_LAST_FILE = 'OPEN_LAST_FILE',
-
-  SEARCH = 'SEARCH',
-  SEND_REPLY = 'SEND_REPLY',
-  EMOJI_DROPDOWN = 'EMOJI_DROPDOWN',
-  TOGGLE_BLAME = 'TOGGLE_BLAME',
-}
-
-export type SectionView = Array<{binding: string[][]; text: string}>;
-
-/**
- * The interface for listener for shortcut events.
- */
-export type ShortcutListener = (
-  viewMap?: Map<ShortcutSection, SectionView>
-) => void;
-
-interface ShortcutHelpItem {
-  shortcut: Shortcut;
-  text: string;
-}
-
-// TODO(TS): rename to something more meaningful
-const _help = new Map<ShortcutSection, ShortcutHelpItem[]>();
-
-function _describe(shortcut: Shortcut, section: ShortcutSection, text: string) {
-  if (!_help.has(section)) {
-    _help.set(section, []);
-  }
-  const shortcuts = _help.get(section);
-  if (shortcuts) {
-    shortcuts.push({shortcut, text});
-  }
-}
-
-_describe(Shortcut.SEARCH, ShortcutSection.EVERYWHERE, 'Search');
-_describe(
-  Shortcut.OPEN_SHORTCUT_HELP_DIALOG,
-  ShortcutSection.EVERYWHERE,
-  'Show this dialog'
-);
-_describe(
-  Shortcut.GO_TO_USER_DASHBOARD,
-  ShortcutSection.EVERYWHERE,
-  'Go to User Dashboard'
-);
-_describe(
-  Shortcut.GO_TO_OPENED_CHANGES,
-  ShortcutSection.EVERYWHERE,
-  'Go to Opened Changes'
-);
-_describe(
-  Shortcut.GO_TO_MERGED_CHANGES,
-  ShortcutSection.EVERYWHERE,
-  'Go to Merged Changes'
-);
-_describe(
-  Shortcut.GO_TO_ABANDONED_CHANGES,
-  ShortcutSection.EVERYWHERE,
-  'Go to Abandoned Changes'
-);
-_describe(
-  Shortcut.GO_TO_WATCHED_CHANGES,
-  ShortcutSection.EVERYWHERE,
-  'Go to Watched Changes'
-);
-
-_describe(
-  Shortcut.CURSOR_NEXT_CHANGE,
-  ShortcutSection.ACTIONS,
-  'Select next change'
-);
-_describe(
-  Shortcut.CURSOR_PREV_CHANGE,
-  ShortcutSection.ACTIONS,
-  'Select previous change'
-);
-_describe(
-  Shortcut.OPEN_CHANGE,
-  ShortcutSection.ACTIONS,
-  'Show selected change'
-);
-_describe(Shortcut.NEXT_PAGE, ShortcutSection.ACTIONS, 'Go to next page');
-_describe(Shortcut.PREV_PAGE, ShortcutSection.ACTIONS, 'Go to previous page');
-_describe(
-  Shortcut.OPEN_REPLY_DIALOG,
-  ShortcutSection.ACTIONS,
-  'Open reply dialog to publish comments and add reviewers'
-);
-_describe(
-  Shortcut.OPEN_DOWNLOAD_DIALOG,
-  ShortcutSection.ACTIONS,
-  'Open download overlay'
-);
-_describe(
-  Shortcut.EXPAND_ALL_MESSAGES,
-  ShortcutSection.ACTIONS,
-  'Expand all messages'
-);
-_describe(
-  Shortcut.COLLAPSE_ALL_MESSAGES,
-  ShortcutSection.ACTIONS,
-  'Collapse all messages'
-);
-_describe(
-  Shortcut.REFRESH_CHANGE,
-  ShortcutSection.ACTIONS,
-  'Reload the change at the latest patch'
-);
-_describe(
-  Shortcut.TOGGLE_CHANGE_REVIEWED,
-  ShortcutSection.ACTIONS,
-  'Mark/unmark change as reviewed'
-);
-_describe(
-  Shortcut.TOGGLE_FILE_REVIEWED,
-  ShortcutSection.ACTIONS,
-  'Toggle review flag on selected file'
-);
-_describe(
-  Shortcut.REFRESH_CHANGE_LIST,
-  ShortcutSection.ACTIONS,
-  'Refresh list of changes'
-);
-_describe(
-  Shortcut.TOGGLE_CHANGE_STAR,
-  ShortcutSection.ACTIONS,
-  'Star/unstar change'
-);
-_describe(
-  Shortcut.OPEN_SUBMIT_DIALOG,
-  ShortcutSection.ACTIONS,
-  'Open submit dialog'
-);
-_describe(Shortcut.EDIT_TOPIC, ShortcutSection.ACTIONS, 'Add a change topic');
-_describe(
-  Shortcut.DIFF_AGAINST_BASE,
-  ShortcutSection.ACTIONS,
-  'Diff against base'
-);
-_describe(
-  Shortcut.DIFF_AGAINST_LATEST,
-  ShortcutSection.ACTIONS,
-  'Diff against latest patchset'
-);
-_describe(
-  Shortcut.DIFF_BASE_AGAINST_LEFT,
-  ShortcutSection.ACTIONS,
-  'Diff base against left'
-);
-_describe(
-  Shortcut.DIFF_RIGHT_AGAINST_LATEST,
-  ShortcutSection.ACTIONS,
-  'Diff right against latest'
-);
-_describe(
-  Shortcut.DIFF_BASE_AGAINST_LATEST,
-  ShortcutSection.ACTIONS,
-  'Diff base against latest'
-);
-
-_describe(Shortcut.NEXT_LINE, ShortcutSection.DIFFS, 'Go to next line');
-_describe(Shortcut.PREV_LINE, ShortcutSection.DIFFS, 'Go to previous line');
-_describe(
-  Shortcut.DIFF_AGAINST_BASE,
-  ShortcutSection.DIFFS,
-  'Diff against base'
-);
-_describe(
-  Shortcut.DIFF_AGAINST_LATEST,
-  ShortcutSection.DIFFS,
-  'Diff against latest patchset'
-);
-_describe(
-  Shortcut.DIFF_BASE_AGAINST_LEFT,
-  ShortcutSection.DIFFS,
-  'Diff base against left'
-);
-_describe(
-  Shortcut.DIFF_RIGHT_AGAINST_LATEST,
-  ShortcutSection.DIFFS,
-  'Diff right against latest'
-);
-_describe(
-  Shortcut.DIFF_BASE_AGAINST_LATEST,
-  ShortcutSection.DIFFS,
-  'Diff base against latest'
-);
-_describe(
-  Shortcut.VISIBLE_LINE,
-  ShortcutSection.DIFFS,
-  'Move cursor to currently visible code'
-);
-_describe(Shortcut.NEXT_CHUNK, ShortcutSection.DIFFS, 'Go to next diff chunk');
-_describe(
-  Shortcut.PREV_CHUNK,
-  ShortcutSection.DIFFS,
-  'Go to previous diff chunk'
-);
-_describe(
-  Shortcut.TOGGLE_ALL_DIFF_CONTEXT,
-  ShortcutSection.DIFFS,
-  'Toggle all diff context'
-);
-_describe(
-  Shortcut.NEXT_COMMENT_THREAD,
-  ShortcutSection.DIFFS,
-  'Go to next comment thread'
-);
-_describe(
-  Shortcut.PREV_COMMENT_THREAD,
-  ShortcutSection.DIFFS,
-  'Go to previous comment thread'
-);
-_describe(
-  Shortcut.EXPAND_ALL_COMMENT_THREADS,
-  ShortcutSection.DIFFS,
-  'Expand all comment threads'
-);
-_describe(
-  Shortcut.COLLAPSE_ALL_COMMENT_THREADS,
-  ShortcutSection.DIFFS,
-  'Collapse all comment threads'
-);
-_describe(
-  Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS,
-  ShortcutSection.DIFFS,
-  'Hide/Display all comment threads'
-);
-_describe(Shortcut.LEFT_PANE, ShortcutSection.DIFFS, 'Select left pane');
-_describe(Shortcut.RIGHT_PANE, ShortcutSection.DIFFS, 'Select right pane');
-_describe(
-  Shortcut.TOGGLE_LEFT_PANE,
-  ShortcutSection.DIFFS,
-  'Hide/show left diff'
-);
-_describe(Shortcut.NEW_COMMENT, ShortcutSection.DIFFS, 'Draft new comment');
-_describe(Shortcut.SAVE_COMMENT, ShortcutSection.DIFFS, 'Save comment');
-_describe(
-  Shortcut.OPEN_DIFF_PREFS,
-  ShortcutSection.DIFFS,
-  'Show diff preferences'
-);
-_describe(
-  Shortcut.TOGGLE_DIFF_REVIEWED,
-  ShortcutSection.DIFFS,
-  'Mark/unmark file as reviewed'
-);
-_describe(
-  Shortcut.TOGGLE_DIFF_MODE,
-  ShortcutSection.DIFFS,
-  'Toggle unified/side-by-side diff'
-);
-_describe(
-  Shortcut.NEXT_UNREVIEWED_FILE,
-  ShortcutSection.DIFFS,
-  'Mark file as reviewed and go to next unreviewed file'
-);
-_describe(Shortcut.TOGGLE_BLAME, ShortcutSection.DIFFS, 'Toggle blame');
-
-_describe(Shortcut.NEXT_FILE, ShortcutSection.NAVIGATION, 'Go to next file');
-_describe(
-  Shortcut.PREV_FILE,
-  ShortcutSection.NAVIGATION,
-  'Go to previous file'
-);
-_describe(
-  Shortcut.NEXT_FILE_WITH_COMMENTS,
-  ShortcutSection.NAVIGATION,
-  'Go to next file that has comments'
-);
-_describe(
-  Shortcut.PREV_FILE_WITH_COMMENTS,
-  ShortcutSection.NAVIGATION,
-  'Go to previous file that has comments'
-);
-_describe(
-  Shortcut.OPEN_FIRST_FILE,
-  ShortcutSection.NAVIGATION,
-  'Go to first file'
-);
-_describe(
-  Shortcut.OPEN_LAST_FILE,
-  ShortcutSection.NAVIGATION,
-  'Go to last file'
-);
-_describe(
-  Shortcut.UP_TO_DASHBOARD,
-  ShortcutSection.NAVIGATION,
-  'Up to dashboard'
-);
-_describe(Shortcut.UP_TO_CHANGE, ShortcutSection.NAVIGATION, 'Up to change');
-
-_describe(
-  Shortcut.CURSOR_NEXT_FILE,
-  ShortcutSection.FILE_LIST,
-  'Select next file'
-);
-_describe(
-  Shortcut.CURSOR_PREV_FILE,
-  ShortcutSection.FILE_LIST,
-  'Select previous file'
-);
-_describe(Shortcut.OPEN_FILE, ShortcutSection.FILE_LIST, 'Go to selected file');
-_describe(
-  Shortcut.TOGGLE_ALL_INLINE_DIFFS,
-  ShortcutSection.FILE_LIST,
-  'Show/hide all inline diffs'
-);
-_describe(
-  Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS,
-  ShortcutSection.FILE_LIST,
-  'Hide/Display all comment threads'
-);
-_describe(
-  Shortcut.TOGGLE_INLINE_DIFF,
-  ShortcutSection.FILE_LIST,
-  'Show/hide selected inline diff'
-);
-
-_describe(Shortcut.SEND_REPLY, ShortcutSection.REPLY_DIALOG, 'Send reply');
-_describe(
-  Shortcut.EMOJI_DROPDOWN,
-  ShortcutSection.REPLY_DIALOG,
-  'Emoji dropdown'
-);
-
-/**
- * Shortcut manager, holds all hosts, bindings and listeners.
- */
-export class ShortcutManager {
-  private readonly activeHosts = new Map<PolymerElement, Map<string, string>>();
-
-  private readonly bindings = new Map<Shortcut, string[]>();
-
-  public _testOnly_getBindings() {
-    return this.bindings;
-  }
-
-  public _testOnly_isEmpty() {
-    return this.activeHosts.size === 0 && this.listeners.size === 0;
-  }
-
-  private readonly listeners = new Set<ShortcutListener>();
-
-  bindShortcut(shortcut: Shortcut, ...bindings: string[]) {
-    this.bindings.set(shortcut, bindings);
-  }
-
-  getBindingsForShortcut(shortcut: Shortcut) {
-    return this.bindings.get(shortcut);
-  }
-
-  attachHost(host: PolymerElement, shortcuts: Map<string, string>) {
-    this.activeHosts.set(host, shortcuts);
-    this.notifyListeners();
-  }
-
-  detachHost(host: PolymerElement) {
-    if (this.activeHosts.delete(host)) {
-      this.notifyListeners();
-      return true;
-    }
-    return false;
-  }
-
-  addListener(listener: ShortcutListener) {
-    this.listeners.add(listener);
-    listener(this.directoryView());
-  }
-
-  removeListener(listener: ShortcutListener) {
-    return this.listeners.delete(listener);
-  }
-
-  getDescription(section: ShortcutSection, shortcutName: Shortcut) {
-    const bindings = _help.get(section);
-    let desc = '';
-    if (bindings) {
-      const binding = bindings.find(
-        binding => binding.shortcut === shortcutName
-      );
-      desc = binding ? binding.text : '';
-    }
-    return desc;
-  }
-
-  getShortcut(shortcutName: Shortcut) {
-    const bindings = this.bindings.get(shortcutName);
-    return bindings
-      ? bindings
-          .map(binding => this.describeBinding(binding).join('+'))
-          .join(',')
-      : '';
-  }
-
-  activeShortcutsBySection() {
-    const activeShortcuts = new Set<string>();
-    this.activeHosts.forEach(shortcuts => {
-      shortcuts.forEach((_, shortcut) => activeShortcuts.add(shortcut));
-    });
-
-    const activeShortcutsBySection = new Map<
-      ShortcutSection,
-      ShortcutHelpItem[]
-    >();
-    _help.forEach((shortcutList, section) => {
-      shortcutList.forEach(shortcutHelp => {
-        if (activeShortcuts.has(shortcutHelp.shortcut)) {
-          if (!activeShortcutsBySection.has(section)) {
-            activeShortcutsBySection.set(section, []);
-          }
-          // From previous condition, the `get(section)`
-          // should always return a valid result
-          activeShortcutsBySection.get(section)!.push(shortcutHelp);
-        }
-      });
-    });
-    return activeShortcutsBySection;
-  }
-
-  directoryView() {
-    const view = new Map<ShortcutSection, SectionView>();
-    this.activeShortcutsBySection().forEach((shortcutHelps, section) => {
-      const sectionView: Array<{binding: string[][]; text: string}> = [];
-      shortcutHelps.forEach(shortcutHelp => {
-        const bindingDesc = this.describeBindings(shortcutHelp.shortcut);
-        if (!bindingDesc) {
-          return;
-        }
-        this.distributeBindingDesc(bindingDesc).forEach(bindingDesc => {
-          sectionView.push({
-            binding: bindingDesc,
-            text: shortcutHelp.text,
-          });
-        });
-      });
-      view.set(section, sectionView);
-    });
-    return view;
-  }
-
-  distributeBindingDesc(bindingDesc: string[][]): string[][][] {
-    if (
-      bindingDesc.length === 1 ||
-      this.comboSetDisplayWidth(bindingDesc) < 21
-    ) {
-      return [bindingDesc];
-    }
-    // Find the largest prefix of bindings that is under the
-    // size threshold.
-    const head = [bindingDesc[0]];
-    for (let i = 1; i < bindingDesc.length; i++) {
-      head.push(bindingDesc[i]);
-      if (this.comboSetDisplayWidth(head) >= 21) {
-        head.pop();
-        return [head].concat(this.distributeBindingDesc(bindingDesc.slice(i)));
-      }
-    }
-    return [];
-  }
-
-  comboSetDisplayWidth(bindingDesc: string[][]) {
-    const bindingSizer = (binding: string[]) =>
-      binding.reduce((acc, key) => acc + key.length, 0);
-    // Width is the sum of strings + (n-1) * 2 to account for the word
-    // "or" joining them.
-    return (
-      bindingDesc.reduce((acc, binding) => acc + bindingSizer(binding), 0) +
-      2 * (bindingDesc.length - 1)
-    );
-  }
-
-  describeBindings(shortcut: Shortcut): string[][] | null {
-    const bindings = this.bindings.get(shortcut);
-    if (!bindings) {
-      return null;
-    }
-    if (bindings[0] === SPECIAL_SHORTCUT.GO_KEY) {
-      return bindings
-        .slice(1)
-        .map(binding => this._describeKey(binding))
-        .map(binding => ['g'].concat(binding));
-    }
-    if (bindings[0] === SPECIAL_SHORTCUT.V_KEY) {
-      return bindings
-        .slice(1)
-        .map(binding => this._describeKey(binding))
-        .map(binding => ['v'].concat(binding));
-    }
-
-    return bindings
-      .filter(binding => binding !== SPECIAL_SHORTCUT.DOC_ONLY)
-      .map(binding => this.describeBinding(binding));
-  }
-
-  _describeKey(key: string) {
-    switch (key) {
-      case 'shift':
-        return 'Shift';
-      case 'meta':
-        return 'Meta';
-      case 'ctrl':
-        return 'Ctrl';
-      case 'enter':
-        return 'Enter';
-      case 'up':
-        return '\u2191'; // ↑
-      case 'down':
-        return '\u2193'; // ↓
-      case 'left':
-        return '\u2190'; // ←
-      case 'right':
-        return '\u2192'; // →
-      default:
-        return key;
-    }
-  }
-
-  describeBinding(binding: string) {
-    // single key bindings
-    if (binding.length === 1) {
-      return [binding];
-    }
-    return binding
-      .split(':')[0]
-      .split('+')
-      .map(part => this._describeKey(part));
-  }
-
-  notifyListeners() {
-    const view = this.directoryView();
-    this.listeners.forEach(listener => listener(view));
-  }
-}
-
-const shortcutManager = new ShortcutManager();
-
 interface IronA11yKeysMixinConstructor {
   // Note: this is needed to have same interface as other mixins
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -773,11 +81,7 @@
 
     ShortcutSection = ShortcutSection;
 
-    private _disableKeyboardShortcuts = false;
-
-    private readonly restApiService = appContext.restApiService;
-
-    private reporting = appContext.reportingService;
+    private readonly shortcuts = appContext.shortcutsService;
 
     /** Used to disable shortcuts when the element is not visible. */
     private observer?: IntersectionObserver;
@@ -796,76 +100,18 @@
     /** Are shortcuts currently enabled? True only when element is visible. */
     private bindingsEnabled = false;
 
-    modifierPressed(event: CustomKeyboardEvent) {
+    modifierPressed(e: IronKeyboardEvent) {
       /* We are checking for g/v as modifiers pressed. There are cases such as
        * pressing v and then /, where we want the handler for / to be triggered.
        * TODO(dhruvsri): find a way to support that keyboard combination
        */
-      const e = getKeyboardEvent(event);
       return (
         isModifierPressed(e) || !!this._inGoKeyMode() || !!this.inVKeyMode()
       );
     }
 
-    shouldSuppressKeyboardShortcut(event: CustomKeyboardEvent) {
-      if (this._disableKeyboardShortcuts) return true;
-      const e = getKeyboardEvent(event);
-      // TODO(TS): maybe override the EventApi, narrow it down to Element always
-      const target = (dom(e) as EventApi).rootTarget as Element;
-      const tagName = target.tagName;
-      const type = target.getAttribute('type');
-      if (
-        // Suppress shortcuts on <input> and <textarea>, but not on
-        // checkboxes, because we want to enable workflows like 'click
-        // mark-reviewed and then press ] to go to the next file'.
-        (tagName === 'INPUT' && type !== 'checkbox') ||
-        tagName === 'TEXTAREA' ||
-        // Suppress shortcuts if the key is 'enter'
-        // and target is an anchor or button or paper-tab.
-        (e.keyCode === 13 &&
-          (tagName === 'A' || tagName === 'BUTTON' || tagName === 'PAPER-TAB'))
-      ) {
-        return true;
-      }
-      for (let i = 0; e.path && i < e.path.length; i++) {
-        // TODO(TS): narrow this down to Element from EventTarget first
-        if ((e.path[i] as Element).tagName === 'GR-OVERLAY') {
-          return true;
-        }
-      }
-
-      // eg: {key: "k:keydown", ..., from: "gr-diff-view"}
-      let key = `${(e as unknown as KeyboardEvent).key}:${e.type}`;
-      if (this._inGoKeyMode()) key = 'g+' + key;
-      if (this.inVKeyMode()) key = 'v+' + key;
-      if (e.shiftKey) key = 'shift+' + key;
-      if (e.ctrlKey) key = 'ctrl+' + key;
-      if (e.metaKey) key = 'meta+' + key;
-      if (e.altKey) key = 'alt+' + key;
-      this.reporting.reportInteraction('shortcut-triggered', {
-        key,
-        from: this.nodeName ?? 'unknown',
-      });
-      return false;
-    }
-
-    // Alias for getKeyboardEvent.
-    getKeyboardEvent(e: CustomKeyboardEvent) {
-      return getKeyboardEvent(e);
-    }
-
-    bindShortcut(shortcut: Shortcut, ...bindings: string[]) {
-      shortcutManager.bindShortcut(shortcut, ...bindings);
-    }
-
-    createTitle(shortcutName: Shortcut, section: ShortcutSection) {
-      const desc = shortcutManager.getDescription(section, shortcutName);
-      const shortcut = shortcutManager.getShortcut(shortcutName);
-      return desc && shortcut ? `${desc} (shortcut: ${shortcut})` : '';
-    }
-
     _addOwnKeyBindings(shortcut: Shortcut, handler: string) {
-      const bindings = shortcutManager.getBindingsForShortcut(shortcut);
+      const bindings = this.shortcuts.getBindingsForShortcut(shortcut);
       if (!bindings) {
         return;
       }
@@ -890,11 +136,6 @@
 
     override connectedCallback() {
       super.connectedCallback();
-      this.restApiService.getPreferences().then(prefs => {
-        if (prefs?.disable_keyboard_shortcuts) {
-          this._disableKeyboardShortcuts = true;
-        }
-      });
       this.createVisibilityObserver();
       this.enableBindings();
     }
@@ -941,7 +182,7 @@
       const shortcuts = new Map<string, string>(
         Object.entries(this.keyboardShortcuts())
       );
-      shortcutManager.attachHost(this, shortcuts);
+      this.shortcuts.attachHost(this, shortcuts);
 
       for (const [key, value] of shortcuts.entries()) {
         this._addOwnKeyBindings(key as Shortcut, value);
@@ -977,7 +218,7 @@
     private disableBindings() {
       if (!this.bindingsEnabled) return;
       this.bindingsEnabled = false;
-      if (shortcutManager.detachHost(this)) {
+      if (this.shortcuts.detachHost(this)) {
         this.removeOwnKeyBindings();
       }
     }
@@ -990,16 +231,8 @@
       return {};
     }
 
-    addKeyboardShortcutDirectoryListener(listener: ShortcutListener) {
-      shortcutManager.addListener(listener);
-    }
-
-    removeKeyboardShortcutDirectoryListener(listener: ShortcutListener) {
-      shortcutManager.removeListener(listener);
-    }
-
-    _handleVKeyDown(e: CustomKeyboardEvent) {
-      if (this.shouldSuppressKeyboardShortcut(e)) return;
+    _handleVKeyDown(e: IronKeyboardEvent) {
+      if (this.shortcuts.shouldSuppress(e)) return;
       this._shortcut_v_key_last_pressed = Date.now();
     }
 
@@ -1016,11 +249,11 @@
       );
     }
 
-    _handleVAction(e: CustomKeyboardEvent) {
+    _handleVAction(e: IronKeyboardEvent) {
       if (
         !this.inVKeyMode() ||
         !this._shortcut_v_table.has(e.detail.key) ||
-        this.shouldSuppressKeyboardShortcut(e)
+        this.shortcuts.shouldSuppress(e)
       ) {
         return;
       }
@@ -1033,8 +266,8 @@
       }
     }
 
-    _handleGoKeyDown(e: CustomKeyboardEvent) {
-      if (this.shouldSuppressKeyboardShortcut(e)) return;
+    _handleGoKeyDown(e: IronKeyboardEvent) {
+      if (this.shortcuts.shouldSuppress(e)) return;
       this._shortcut_go_key_last_pressed = Date.now();
     }
 
@@ -1053,11 +286,11 @@
       );
     }
 
-    _handleGoAction(e: CustomKeyboardEvent) {
+    _handleGoAction(e: IronKeyboardEvent) {
       if (
         !this._inGoKeyMode() ||
         !this._shortcut_go_table.has(e.detail.key) ||
-        this.shouldSuppressKeyboardShortcut(e)
+        this.shortcuts.shouldSuppress(e)
       ) {
         return;
       }
@@ -1071,7 +304,10 @@
     }
   }
 
-  return Mixin as T & Constructor<KeyboardShortcutMixinInterface>;
+  return Mixin as T &
+    Constructor<
+      KeyboardShortcutMixinInterface & KeyboardShortcutMixinInterfaceTesting
+    >;
 };
 
 // The following doesn't work (IronA11yKeysBehavior crashes):
@@ -1084,7 +320,10 @@
 // This is a workaround
 export const KeyboardShortcutMixin = <T extends Constructor<PolymerElement>>(
   superClass: T
-): T & Constructor<KeyboardShortcutMixinInterface> =>
+): T &
+  Constructor<
+    KeyboardShortcutMixinInterface & KeyboardShortcutMixinInterfaceTesting
+  > =>
   InternalKeyboardShortcutMixin(
     // TODO(TS): mixinBehaviors in some lib is returning: `new () => T` instead
     // which will fail the type check due to missing IronA11yKeysBehavior interface
@@ -1094,21 +333,14 @@
 
 /** The interface corresponding to KeyboardShortcutMixin */
 export interface KeyboardShortcutMixinInterface {
-  Shortcut: typeof Shortcut;
-  ShortcutSection: typeof ShortcutSection;
+  keyboardShortcuts(): {[key: string]: string | null};
+  modifierPressed(event: IronKeyboardEvent): boolean;
+}
+
+export interface KeyboardShortcutMixinInterfaceTesting {
   _shortcut_go_key_last_pressed: number | null;
   _shortcut_v_key_last_pressed: number | null;
   _shortcut_go_table: Map<string, string>;
   _shortcut_v_table: Map<string, string>;
-  keyboardShortcuts(): {[key: string]: string | null};
-  createTitle(name: Shortcut, section: ShortcutSection): string;
-  bindShortcut(shortcut: Shortcut, ...bindings: string[]): void;
-  shouldSuppressKeyboardShortcut(event: CustomKeyboardEvent): boolean;
-  modifierPressed(event: CustomKeyboardEvent): boolean;
-  addKeyboardShortcutDirectoryListener(listener: ShortcutListener): void;
-  removeKeyboardShortcutDirectoryListener(listener: ShortcutListener): void;
-}
-
-export function _testOnly_getShortcutManagerInstance() {
-  return shortcutManager;
+  _handleGoAction: (e: IronKeyboardEvent) => void;
 }
diff --git a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin_test.js b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin_test.js
deleted file mode 100644
index 4536ecd..0000000
--- a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin_test.js
+++ /dev/null
@@ -1,424 +0,0 @@
-/**
- * @license
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import '../../test/common-test-setup-karma.js';
-import {
-  KeyboardShortcutMixin, Shortcut,
-  ShortcutManager, ShortcutSection, SPECIAL_SHORTCUT,
-} from './keyboard-shortcut-mixin.js';
-import {html} from '@polymer/polymer/lib/utils/html-tag.js';
-import {PolymerElement} from '@polymer/polymer/polymer-element.js';
-import {mockPromise} from '../../test/test-utils.js';
-
-const basicFixture =
-    fixtureFromElement('keyboard-shortcut-mixin-test-element');
-
-const withinOverlayFixture = fixtureFromTemplate(html`
-<gr-overlay>
-  <keyboard-shortcut-mixin-test-element>
-  </keyboard-shortcut-mixin-test-element>
-</gr-overlay>
-`);
-
-class GrKeyboardShortcutMixinTestElement extends
-  KeyboardShortcutMixin(PolymerElement) {
-  static get is() {
-    return 'keyboard-shortcut-mixin-test-element';
-  }
-
-  get keyBindings() {
-    return {
-      k: '_handleKey',
-      enter: '_handleKey',
-    };
-  }
-
-  _handleKey() {}
-}
-
-customElements.define(GrKeyboardShortcutMixinTestElement.is,
-    GrKeyboardShortcutMixinTestElement);
-
-suite('keyboard-shortcut-mixin tests', () => {
-  let element;
-  let overlay;
-
-  setup(() => {
-    element = basicFixture.instantiate();
-    overlay = withinOverlayFixture.instantiate();
-  });
-
-  suite('ShortcutManager', () => {
-    test('bindings management', () => {
-      const mgr = new ShortcutManager();
-      const NEXT_FILE = Shortcut.NEXT_FILE;
-
-      assert.isUndefined(mgr.getBindingsForShortcut(NEXT_FILE));
-      mgr.bindShortcut(NEXT_FILE, ']', '}', 'right');
-      assert.deepEqual(
-          mgr.getBindingsForShortcut(NEXT_FILE),
-          [']', '}', 'right']);
-    });
-
-    test('getShortcut', () => {
-      const mgr = new ShortcutManager();
-      const NEXT_FILE = Shortcut.NEXT_FILE;
-
-      assert.isUndefined(mgr.getBindingsForShortcut(NEXT_FILE));
-      mgr.bindShortcut(NEXT_FILE, ']', '}', 'right');
-      assert.equal(mgr.getShortcut(NEXT_FILE), '],},→');
-    });
-
-    test('getShortcut with modifiers', () => {
-      const mgr = new ShortcutManager();
-      const NEXT_FILE = Shortcut.NEXT_FILE;
-
-      assert.isUndefined(mgr.getBindingsForShortcut(NEXT_FILE));
-      mgr.bindShortcut(NEXT_FILE, 'Shift+a:key');
-      assert.equal(mgr.getShortcut(NEXT_FILE), 'Shift+a');
-    });
-
-    suite('binding descriptions', () => {
-      function mapToObject(m) {
-        const o = {};
-        m.forEach((v, k) => o[k] = v);
-        return o;
-      }
-
-      test('single combo description', () => {
-        const mgr = new ShortcutManager();
-        assert.deepEqual(mgr.describeBinding('a'), ['a']);
-        assert.deepEqual(mgr.describeBinding('a:keyup'), ['a']);
-        assert.deepEqual(mgr.describeBinding('ctrl+a'), ['Ctrl', 'a']);
-        assert.deepEqual(
-            mgr.describeBinding('ctrl+shift+up:keyup'),
-            ['Ctrl', 'Shift', '↑']);
-      });
-
-      test('combo set description', () => {
-        const mgr = new ShortcutManager();
-        assert.isNull(mgr.describeBindings(Shortcut.NEXT_FILE));
-
-        mgr.bindShortcut(Shortcut.GO_TO_OPENED_CHANGES,
-            SPECIAL_SHORTCUT.GO_KEY, 'o');
-        assert.deepEqual(
-            mgr.describeBindings(Shortcut.GO_TO_OPENED_CHANGES),
-            [['g', 'o']]);
-
-        mgr.bindShortcut(Shortcut.NEXT_FILE, SPECIAL_SHORTCUT.DOC_ONLY,
-            ']', 'ctrl+shift+right:keyup');
-        assert.deepEqual(
-            mgr.describeBindings(Shortcut.NEXT_FILE),
-            [[']'], ['Ctrl', 'Shift', '→']]);
-
-        mgr.bindShortcut(Shortcut.PREV_FILE, '[');
-        assert.deepEqual(mgr.describeBindings(Shortcut.PREV_FILE), [['[']]);
-      });
-
-      test('combo set description width', () => {
-        const mgr = new ShortcutManager();
-        assert.strictEqual(mgr.comboSetDisplayWidth([['u']]), 1);
-        assert.strictEqual(mgr.comboSetDisplayWidth([['g', 'o']]), 2);
-        assert.strictEqual(mgr.comboSetDisplayWidth([['Shift', 'r']]), 6);
-        assert.strictEqual(mgr.comboSetDisplayWidth([['x'], ['y']]), 4);
-        assert.strictEqual(
-            mgr.comboSetDisplayWidth([['x'], ['y'], ['Shift', 'z']]),
-            12);
-      });
-
-      test('distribute shortcut help', () => {
-        const mgr = new ShortcutManager();
-        assert.deepEqual(mgr.distributeBindingDesc([['o']]), [[['o']]]);
-        assert.deepEqual(
-            mgr.distributeBindingDesc([['g', 'o']]),
-            [[['g', 'o']]]);
-        assert.deepEqual(
-            mgr.distributeBindingDesc([['ctrl', 'shift', 'meta', 'enter']]),
-            [[['ctrl', 'shift', 'meta', 'enter']]]);
-        assert.deepEqual(
-            mgr.distributeBindingDesc([
-              ['ctrl', 'shift', 'meta', 'enter'],
-              ['o'],
-            ]),
-            [
-              [['ctrl', 'shift', 'meta', 'enter']],
-              [['o']],
-            ]);
-        assert.deepEqual(
-            mgr.distributeBindingDesc([
-              ['ctrl', 'enter'],
-              ['meta', 'enter'],
-              ['ctrl', 's'],
-              ['meta', 's'],
-            ]),
-            [
-              [['ctrl', 'enter'], ['meta', 'enter']],
-              [['ctrl', 's'], ['meta', 's']],
-            ]);
-      });
-
-      test('active shortcuts by section', () => {
-        const mgr = new ShortcutManager();
-        mgr.bindShortcut(Shortcut.NEXT_FILE, ']');
-        mgr.bindShortcut(Shortcut.NEXT_LINE, 'j');
-        mgr.bindShortcut(Shortcut.GO_TO_OPENED_CHANGES, 'g+o');
-        mgr.bindShortcut(Shortcut.SEARCH, '/');
-
-        assert.deepEqual(
-            mapToObject(mgr.activeShortcutsBySection()),
-            {});
-
-        mgr.attachHost({}, new Map([[Shortcut.NEXT_FILE, null]]));
-        assert.deepEqual(
-            mapToObject(mgr.activeShortcutsBySection()),
-            {
-              [ShortcutSection.NAVIGATION]: [
-                {shortcut: Shortcut.NEXT_FILE, text: 'Go to next file'},
-              ],
-            });
-
-        mgr.attachHost({}, new Map([[Shortcut.NEXT_LINE, null]]));
-        assert.deepEqual(
-            mapToObject(mgr.activeShortcutsBySection()),
-            {
-              [ShortcutSection.DIFFS]: [
-                {shortcut: Shortcut.NEXT_LINE, text: 'Go to next line'},
-              ],
-              [ShortcutSection.NAVIGATION]: [
-                {shortcut: Shortcut.NEXT_FILE, text: 'Go to next file'},
-              ],
-            });
-
-        mgr.attachHost({}, new Map([
-          [Shortcut.SEARCH, null],
-          [Shortcut.GO_TO_OPENED_CHANGES, null],
-        ]));
-        assert.deepEqual(
-            mapToObject(mgr.activeShortcutsBySection()),
-            {
-              [ShortcutSection.DIFFS]: [
-                {shortcut: Shortcut.NEXT_LINE, text: 'Go to next line'},
-              ],
-              [ShortcutSection.EVERYWHERE]: [
-                {shortcut: Shortcut.SEARCH, text: 'Search'},
-                {
-                  shortcut: Shortcut.GO_TO_OPENED_CHANGES,
-                  text: 'Go to Opened Changes',
-                },
-              ],
-              [ShortcutSection.NAVIGATION]: [
-                {shortcut: Shortcut.NEXT_FILE, text: 'Go to next file'},
-              ],
-            });
-      });
-
-      test('directory view', () => {
-        const mgr = new ShortcutManager();
-        mgr.bindShortcut(Shortcut.NEXT_FILE, ']');
-        mgr.bindShortcut(Shortcut.NEXT_LINE, 'j');
-        mgr.bindShortcut(Shortcut.GO_TO_OPENED_CHANGES,
-            SPECIAL_SHORTCUT.GO_KEY, 'o');
-        mgr.bindShortcut(Shortcut.SEARCH, '/');
-        mgr.bindShortcut(
-            Shortcut.SAVE_COMMENT, 'ctrl+enter', 'meta+enter',
-            'ctrl+s', 'meta+s');
-
-        assert.deepEqual(mapToObject(mgr.directoryView()), {});
-
-        mgr.attachHost({}, new Map([
-          [Shortcut.GO_TO_OPENED_CHANGES, null],
-          [Shortcut.NEXT_FILE, null],
-          [Shortcut.NEXT_LINE, null],
-          [Shortcut.SAVE_COMMENT, null],
-          [Shortcut.SEARCH, null],
-        ]));
-        assert.deepEqual(
-            mapToObject(mgr.directoryView()),
-            {
-              [ShortcutSection.DIFFS]: [
-                {binding: [['j']], text: 'Go to next line'},
-                {
-                  binding: [['Ctrl', 'Enter'], ['Meta', 'Enter']],
-                  text: 'Save comment',
-                },
-                {
-                  binding: [['Ctrl', 's'], ['Meta', 's']],
-                  text: 'Save comment',
-                },
-              ],
-              [ShortcutSection.EVERYWHERE]: [
-                {binding: [['/']], text: 'Search'},
-                {binding: [['g', 'o']], text: 'Go to Opened Changes'},
-              ],
-              [ShortcutSection.NAVIGATION]: [
-                {binding: [[']']], text: 'Go to next file'},
-              ],
-            });
-      });
-    });
-  });
-
-  test('doesn’t block kb shortcuts for non-allowed els', async () => {
-    const divEl = document.createElement('div');
-    element.appendChild(divEl);
-    const promise = mockPromise();
-    element._handleKey = e => {
-      assert.isFalse(element.shouldSuppressKeyboardShortcut(e));
-      promise.resolve();
-    };
-    MockInteractions.keyDownOn(divEl, 75, null, 'k');
-    await promise;
-  });
-
-  test('blocks kb shortcuts for input els', async () => {
-    const inputEl = document.createElement('input');
-    element.appendChild(inputEl);
-    const promise = mockPromise();
-    element._handleKey = e => {
-      assert.isTrue(element.shouldSuppressKeyboardShortcut(e));
-      promise.resolve();
-    };
-    MockInteractions.keyDownOn(inputEl, 75, null, 'k');
-    await promise;
-  });
-
-  test('doesn’t block kb shortcuts for checkboxes', async () => {
-    const inputEl = document.createElement('input');
-    inputEl.setAttribute('type', 'checkbox');
-    element.appendChild(inputEl);
-    const promise = mockPromise();
-    element._handleKey = e => {
-      assert.isFalse(element.shouldSuppressKeyboardShortcut(e));
-      promise.resolve();
-    };
-    MockInteractions.keyDownOn(inputEl, 75, null, 'k');
-    await promise;
-  });
-
-  test('blocks kb shortcuts for textarea els', async () => {
-    const textareaEl = document.createElement('textarea');
-    element.appendChild(textareaEl);
-    const promise = mockPromise();
-    element._handleKey = e => {
-      assert.isTrue(element.shouldSuppressKeyboardShortcut(e));
-      promise.resolve();
-    };
-    MockInteractions.keyDownOn(textareaEl, 75, null, 'k');
-    await promise;
-  });
-
-  test('blocks kb shortcuts for anything in a gr-overlay', async () => {
-    const divEl = document.createElement('div');
-    const element =
-        overlay.querySelector('keyboard-shortcut-mixin-test-element');
-    element.appendChild(divEl);
-    const promise = mockPromise();
-    element._handleKey = e => {
-      assert.isTrue(element.shouldSuppressKeyboardShortcut(e));
-      promise.resolve();
-    };
-    MockInteractions.keyDownOn(divEl, 75, null, 'k');
-    await promise;
-  });
-
-  test('blocks enter shortcut on an anchor', async () => {
-    const anchorEl = document.createElement('a');
-    const element =
-        overlay.querySelector('keyboard-shortcut-mixin-test-element');
-    element.appendChild(anchorEl);
-    const promise = mockPromise();
-    element._handleKey = e => {
-      assert.isTrue(element.shouldSuppressKeyboardShortcut(e));
-      promise.resolve();
-    };
-    MockInteractions.keyDownOn(anchorEl, 13, null, 'enter');
-    await promise;
-  });
-
-  test('modifierPressed returns accurate values', () => {
-    const spy = sinon.spy(element, 'modifierPressed');
-    element._handleKey = e => {
-      element.modifierPressed(e);
-    };
-    MockInteractions.keyDownOn(element, 75, 'shift', 'k');
-    assert.isTrue(spy.lastCall.returnValue);
-    MockInteractions.keyDownOn(element, 75, null, 'k');
-    assert.isFalse(spy.lastCall.returnValue);
-    MockInteractions.keyDownOn(element, 75, 'ctrl', 'k');
-    assert.isTrue(spy.lastCall.returnValue);
-    MockInteractions.keyDownOn(element, 75, null, 'k');
-    assert.isFalse(spy.lastCall.returnValue);
-    MockInteractions.keyDownOn(element, 75, 'meta', 'k');
-    assert.isTrue(spy.lastCall.returnValue);
-    MockInteractions.keyDownOn(element, 75, null, 'k');
-    assert.isFalse(spy.lastCall.returnValue);
-    MockInteractions.keyDownOn(element, 75, 'alt', 'k');
-    assert.isTrue(spy.lastCall.returnValue);
-  });
-
-  suite('GO_KEY timing', () => {
-    let handlerStub;
-
-    setup(() => {
-      element._shortcut_go_table.set('a', '_handleA');
-      handlerStub = element._handleA = sinon.stub();
-      sinon.stub(Date, 'now').returns(10000);
-    });
-
-    test('success', () => {
-      const e = {detail: {key: 'a'}, preventDefault: () => {}};
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-      element._shortcut_go_key_last_pressed = 9000;
-      element._handleGoAction(e);
-      assert.isTrue(handlerStub.calledOnce);
-      assert.strictEqual(handlerStub.lastCall.args[0], e);
-    });
-
-    test('go key not pressed', () => {
-      const e = {detail: {key: 'a'}, preventDefault: () => {}};
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-      element._shortcut_go_key_last_pressed = null;
-      element._handleGoAction(e);
-      assert.isFalse(handlerStub.called);
-    });
-
-    test('go key pressed too long ago', () => {
-      const e = {detail: {key: 'a'}, preventDefault: () => {}};
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-      element._shortcut_go_key_last_pressed = 3000;
-      element._handleGoAction(e);
-      assert.isFalse(handlerStub.called);
-    });
-
-    test('should suppress', () => {
-      const e = {detail: {key: 'a'}, preventDefault: () => {}};
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(true);
-      element._shortcut_go_key_last_pressed = 9000;
-      element._handleGoAction(e);
-      assert.isFalse(handlerStub.called);
-    });
-
-    test('unrecognized key', () => {
-      const e = {detail: {key: 'f'}, preventDefault: () => {}};
-      sinon.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
-      element._shortcut_go_key_last_pressed = 9000;
-      element._handleGoAction(e);
-      assert.isFalse(handlerStub.called);
-    });
-  });
-});
-
diff --git a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin_test.ts b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin_test.ts
new file mode 100644
index 0000000..01ad6cc
--- /dev/null
+++ b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin_test.ts
@@ -0,0 +1,139 @@
+/**
+ * @license
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import '../../test/common-test-setup-karma';
+import {KeyboardShortcutMixin} from './keyboard-shortcut-mixin';
+import {PolymerElement} from '@polymer/polymer/polymer-element';
+import '../../elements/shared/gr-overlay/gr-overlay';
+import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
+import {IronKeyboardEvent} from '../../types/events';
+
+class GrKeyboardShortcutMixinTestElement extends KeyboardShortcutMixin(
+  PolymerElement
+) {
+  static get is() {
+    return 'keyboard-shortcut-mixin-test-element';
+  }
+
+  get keyBindings() {
+    return {
+      k: '_handleKey',
+      enter: '_handleKey',
+    };
+  }
+
+  _handleKey(_: any) {}
+
+  _handleA(_: any) {}
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    'keyboard-shortcut-mixin-test-element': GrKeyboardShortcutMixinTestElement;
+  }
+}
+
+customElements.define(
+  GrKeyboardShortcutMixinTestElement.is,
+  GrKeyboardShortcutMixinTestElement
+);
+
+const basicFixture = fixtureFromElement('keyboard-shortcut-mixin-test-element');
+
+suite('keyboard-shortcut-mixin tests', () => {
+  let element: GrKeyboardShortcutMixinTestElement;
+
+  setup(async () => {
+    element = basicFixture.instantiate();
+    await flush();
+  });
+
+  test('modifierPressed returns accurate values', () => {
+    const spy = sinon.spy(element, 'modifierPressed');
+    element._handleKey = e => {
+      element.modifierPressed(e);
+    };
+    MockInteractions.keyDownOn(element, 75, 'shift', 'k');
+    assert.isTrue(spy.lastCall.returnValue);
+    MockInteractions.keyDownOn(element, 75, null, 'k');
+    assert.isFalse(spy.lastCall.returnValue);
+    MockInteractions.keyDownOn(element, 75, 'ctrl', 'k');
+    assert.isTrue(spy.lastCall.returnValue);
+    MockInteractions.keyDownOn(element, 75, null, 'k');
+    assert.isFalse(spy.lastCall.returnValue);
+    MockInteractions.keyDownOn(element, 75, 'meta', 'k');
+    assert.isTrue(spy.lastCall.returnValue);
+    MockInteractions.keyDownOn(element, 75, null, 'k');
+    assert.isFalse(spy.lastCall.returnValue);
+    MockInteractions.keyDownOn(element, 75, 'alt', 'k');
+    assert.isTrue(spy.lastCall.returnValue);
+  });
+
+  suite('GO_KEY timing', () => {
+    let handlerStub: sinon.SinonStub;
+
+    setup(() => {
+      element._shortcut_go_table.set('a', '_handleA');
+      handlerStub = element._handleA = sinon.stub();
+      sinon.stub(Date, 'now').returns(10000);
+    });
+
+    test('success', () => {
+      const e = {
+        detail: {key: 'a'},
+        preventDefault: () => {},
+        composedPath: () => [],
+      } as unknown as IronKeyboardEvent;
+      element._shortcut_go_key_last_pressed = 9000;
+      element._handleGoAction(e);
+      assert.isTrue(handlerStub.calledOnce);
+      assert.strictEqual(handlerStub.lastCall.args[0], e);
+    });
+
+    test('go key not pressed', () => {
+      const e = {
+        detail: {key: 'a'},
+        preventDefault: () => {},
+        composedPath: () => [],
+      } as unknown as IronKeyboardEvent;
+      element._shortcut_go_key_last_pressed = null;
+      element._handleGoAction(e);
+      assert.isFalse(handlerStub.called);
+    });
+
+    test('go key pressed too long ago', () => {
+      const e = {
+        detail: {key: 'a'},
+        preventDefault: () => {},
+        composedPath: () => [],
+      } as unknown as IronKeyboardEvent;
+      element._shortcut_go_key_last_pressed = 3000;
+      element._handleGoAction(e);
+      assert.isFalse(handlerStub.called);
+    });
+
+    test('unrecognized key', () => {
+      const e = {
+        detail: {key: 'f'},
+        preventDefault: () => {},
+        composedPath: () => [],
+      } as unknown as IronKeyboardEvent;
+      element._shortcut_go_key_last_pressed = 9000;
+      element._handleGoAction(e);
+      assert.isFalse(handlerStub.called);
+    });
+  });
+});
diff --git a/polygerrit-ui/app/package.json b/polygerrit-ui/app/package.json
index 4be6241..2ad4e79 100644
--- a/polygerrit-ui/app/package.json
+++ b/polygerrit-ui/app/package.json
@@ -38,7 +38,7 @@
     "ba-linkify": "^1.0.1",
     "codemirror-minified": "^5.62.2",
     "immer": "^9.0.5",
-    "lit": "2.0.0-rc.3",
+    "lit": "2.0.2",
     "page": "^1.11.6",
     "polymer-bridges": "file:../../polymer-bridges/",
     "polymer-resin": "^2.0.1",
diff --git a/polygerrit-ui/app/services/app-context-init.ts b/polygerrit-ui/app/services/app-context-init.ts
index ade9529..3a6f7c5 100644
--- a/polygerrit-ui/app/services/app-context-init.ts
+++ b/polygerrit-ui/app/services/app-context-init.ts
@@ -27,6 +27,7 @@
 import {ConfigService} from './config/config-service';
 import {UserService} from './user/user-service';
 import {CommentsService} from './comments/comments-service';
+import {ShortcutsService} from './shortcuts/shortcuts-service';
 
 type ServiceName = keyof AppContext;
 type ServiceCreator<T> = () => T;
@@ -82,5 +83,6 @@
     storageService: () => new GrStorageService(),
     configService: () => new ConfigService(),
     userService: () => new UserService(appContext.restApiService),
+    shortcutsService: () => new ShortcutsService(appContext.reportingService),
   });
 }
diff --git a/polygerrit-ui/app/services/app-context.ts b/polygerrit-ui/app/services/app-context.ts
index 161378d..e5828d6 100644
--- a/polygerrit-ui/app/services/app-context.ts
+++ b/polygerrit-ui/app/services/app-context.ts
@@ -26,6 +26,7 @@
 import {ConfigService} from './config/config-service';
 import {UserService} from './user/user-service';
 import {CommentsService} from './comments/comments-service';
+import {ShortcutsService} from './shortcuts/shortcuts-service';
 
 export interface AppContext {
   flagsService: FlagsService;
@@ -40,6 +41,7 @@
   storageService: StorageService;
   configService: ConfigService;
   userService: UserService;
+  shortcutsService: ShortcutsService;
 }
 
 /**
diff --git a/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts b/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts
new file mode 100644
index 0000000..bd004d7
--- /dev/null
+++ b/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts
@@ -0,0 +1,552 @@
+/**
+ * @license
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/** Enum for all special shortcuts */
+export enum SPECIAL_SHORTCUT {
+  DOC_ONLY = 'DOC_ONLY',
+  GO_KEY = 'GO_KEY',
+  V_KEY = 'V_KEY',
+}
+
+/**
+ * Enum for all shortcut sections, where that shortcut should be applied to.
+ */
+export enum ShortcutSection {
+  ACTIONS = 'Actions',
+  DIFFS = 'Diffs',
+  EVERYWHERE = 'Global Shortcuts',
+  FILE_LIST = 'File list',
+  NAVIGATION = 'Navigation',
+  REPLY_DIALOG = 'Reply dialog',
+}
+
+/**
+ * Enum for all possible shortcut names.
+ */
+export enum Shortcut {
+  OPEN_SHORTCUT_HELP_DIALOG = 'OPEN_SHORTCUT_HELP_DIALOG',
+  GO_TO_USER_DASHBOARD = 'GO_TO_USER_DASHBOARD',
+  GO_TO_OPENED_CHANGES = 'GO_TO_OPENED_CHANGES',
+  GO_TO_MERGED_CHANGES = 'GO_TO_MERGED_CHANGES',
+  GO_TO_ABANDONED_CHANGES = 'GO_TO_ABANDONED_CHANGES',
+  GO_TO_WATCHED_CHANGES = 'GO_TO_WATCHED_CHANGES',
+
+  CURSOR_NEXT_CHANGE = 'CURSOR_NEXT_CHANGE',
+  CURSOR_PREV_CHANGE = 'CURSOR_PREV_CHANGE',
+  OPEN_CHANGE = 'OPEN_CHANGE',
+  NEXT_PAGE = 'NEXT_PAGE',
+  PREV_PAGE = 'PREV_PAGE',
+  TOGGLE_CHANGE_REVIEWED = 'TOGGLE_CHANGE_REVIEWED',
+  TOGGLE_CHANGE_STAR = 'TOGGLE_CHANGE_STAR',
+  REFRESH_CHANGE_LIST = 'REFRESH_CHANGE_LIST',
+  OPEN_SUBMIT_DIALOG = 'OPEN_SUBMIT_DIALOG',
+  TOGGLE_ATTENTION_SET = 'TOGGLE_ATTENTION_SET',
+
+  OPEN_REPLY_DIALOG = 'OPEN_REPLY_DIALOG',
+  OPEN_DOWNLOAD_DIALOG = 'OPEN_DOWNLOAD_DIALOG',
+  EXPAND_ALL_MESSAGES = 'EXPAND_ALL_MESSAGES',
+  COLLAPSE_ALL_MESSAGES = 'COLLAPSE_ALL_MESSAGES',
+  UP_TO_DASHBOARD = 'UP_TO_DASHBOARD',
+  UP_TO_CHANGE = 'UP_TO_CHANGE',
+  TOGGLE_DIFF_MODE = 'TOGGLE_DIFF_MODE',
+  REFRESH_CHANGE = 'REFRESH_CHANGE',
+  EDIT_TOPIC = 'EDIT_TOPIC',
+  DIFF_AGAINST_BASE = 'DIFF_AGAINST_BASE',
+  DIFF_AGAINST_LATEST = 'DIFF_AGAINST_LATEST',
+  DIFF_BASE_AGAINST_LEFT = 'DIFF_BASE_AGAINST_LEFT',
+  DIFF_RIGHT_AGAINST_LATEST = 'DIFF_RIGHT_AGAINST_LATEST',
+  DIFF_BASE_AGAINST_LATEST = 'DIFF_BASE_AGAINST_LATEST',
+
+  NEXT_LINE = 'NEXT_LINE',
+  PREV_LINE = 'PREV_LINE',
+  VISIBLE_LINE = 'VISIBLE_LINE',
+  NEXT_CHUNK = 'NEXT_CHUNK',
+  PREV_CHUNK = 'PREV_CHUNK',
+  TOGGLE_ALL_DIFF_CONTEXT = 'TOGGLE_ALL_DIFF_CONTEXT',
+  NEXT_COMMENT_THREAD = 'NEXT_COMMENT_THREAD',
+  PREV_COMMENT_THREAD = 'PREV_COMMENT_THREAD',
+  EXPAND_ALL_COMMENT_THREADS = 'EXPAND_ALL_COMMENT_THREADS',
+  COLLAPSE_ALL_COMMENT_THREADS = 'COLLAPSE_ALL_COMMENT_THREADS',
+  LEFT_PANE = 'LEFT_PANE',
+  RIGHT_PANE = 'RIGHT_PANE',
+  TOGGLE_LEFT_PANE = 'TOGGLE_LEFT_PANE',
+  NEW_COMMENT = 'NEW_COMMENT',
+  SAVE_COMMENT = 'SAVE_COMMENT',
+  OPEN_DIFF_PREFS = 'OPEN_DIFF_PREFS',
+  TOGGLE_DIFF_REVIEWED = 'TOGGLE_DIFF_REVIEWED',
+
+  NEXT_FILE = 'NEXT_FILE',
+  PREV_FILE = 'PREV_FILE',
+  NEXT_FILE_WITH_COMMENTS = 'NEXT_FILE_WITH_COMMENTS',
+  PREV_FILE_WITH_COMMENTS = 'PREV_FILE_WITH_COMMENTS',
+  NEXT_UNREVIEWED_FILE = 'NEXT_UNREVIEWED_FILE',
+  CURSOR_NEXT_FILE = 'CURSOR_NEXT_FILE',
+  CURSOR_PREV_FILE = 'CURSOR_PREV_FILE',
+  OPEN_FILE = 'OPEN_FILE',
+  TOGGLE_FILE_REVIEWED = 'TOGGLE_FILE_REVIEWED',
+  TOGGLE_ALL_INLINE_DIFFS = 'TOGGLE_ALL_INLINE_DIFFS',
+  TOGGLE_INLINE_DIFF = 'TOGGLE_INLINE_DIFF',
+  TOGGLE_HIDE_ALL_COMMENT_THREADS = 'TOGGLE_HIDE_ALL_COMMENT_THREADS',
+  OPEN_FILE_LIST = 'OPEN_FILE_LIST',
+
+  OPEN_FIRST_FILE = 'OPEN_FIRST_FILE',
+  OPEN_LAST_FILE = 'OPEN_LAST_FILE',
+
+  SEARCH = 'SEARCH',
+  SEND_REPLY = 'SEND_REPLY',
+  EMOJI_DROPDOWN = 'EMOJI_DROPDOWN',
+  TOGGLE_BLAME = 'TOGGLE_BLAME',
+}
+
+export interface ShortcutHelpItem {
+  shortcut: Shortcut;
+  text: string;
+  bindings: string[];
+}
+
+export const config = new Map<ShortcutSection, ShortcutHelpItem[]>();
+
+function describe(
+  shortcut: Shortcut,
+  section: ShortcutSection,
+  text: string,
+  binding: string,
+  ...moreBindings: string[]
+) {
+  if (!config.has(section)) {
+    config.set(section, []);
+  }
+  const shortcuts = config.get(section);
+  if (shortcuts) {
+    shortcuts.push({shortcut, text, bindings: [binding, ...moreBindings]});
+  }
+}
+
+describe(Shortcut.SEARCH, ShortcutSection.EVERYWHERE, 'Search', '/');
+describe(
+  Shortcut.OPEN_SHORTCUT_HELP_DIALOG,
+  ShortcutSection.EVERYWHERE,
+  'Show this dialog',
+  '?'
+);
+describe(
+  Shortcut.GO_TO_USER_DASHBOARD,
+  ShortcutSection.EVERYWHERE,
+  'Go to User Dashboard',
+  SPECIAL_SHORTCUT.GO_KEY,
+  'i'
+);
+describe(
+  Shortcut.GO_TO_OPENED_CHANGES,
+  ShortcutSection.EVERYWHERE,
+  'Go to Opened Changes',
+  SPECIAL_SHORTCUT.GO_KEY,
+  'o'
+);
+describe(
+  Shortcut.GO_TO_MERGED_CHANGES,
+  ShortcutSection.EVERYWHERE,
+  'Go to Merged Changes',
+  SPECIAL_SHORTCUT.GO_KEY,
+  'm'
+);
+describe(
+  Shortcut.GO_TO_ABANDONED_CHANGES,
+  ShortcutSection.EVERYWHERE,
+  'Go to Abandoned Changes',
+  SPECIAL_SHORTCUT.GO_KEY,
+  'a'
+);
+describe(
+  Shortcut.GO_TO_WATCHED_CHANGES,
+  ShortcutSection.EVERYWHERE,
+  'Go to Watched Changes',
+  SPECIAL_SHORTCUT.GO_KEY,
+  'w'
+);
+
+describe(
+  Shortcut.CURSOR_NEXT_CHANGE,
+  ShortcutSection.ACTIONS,
+  'Select next change',
+  'j'
+);
+describe(
+  Shortcut.CURSOR_PREV_CHANGE,
+  ShortcutSection.ACTIONS,
+  'Select previous change',
+  'k'
+);
+describe(
+  Shortcut.OPEN_CHANGE,
+  ShortcutSection.ACTIONS,
+  'Show selected change',
+  'o'
+);
+describe(
+  Shortcut.NEXT_PAGE,
+  ShortcutSection.ACTIONS,
+  'Go to next page',
+  'n',
+  ']'
+);
+describe(
+  Shortcut.PREV_PAGE,
+  ShortcutSection.ACTIONS,
+  'Go to previous page',
+  'p',
+  '['
+);
+describe(
+  Shortcut.OPEN_REPLY_DIALOG,
+  ShortcutSection.ACTIONS,
+  'Open reply dialog to publish comments and add reviewers',
+  'a:keyup'
+);
+describe(
+  Shortcut.OPEN_DOWNLOAD_DIALOG,
+  ShortcutSection.ACTIONS,
+  'Open download overlay',
+  'd:keyup'
+);
+describe(
+  Shortcut.EXPAND_ALL_MESSAGES,
+  ShortcutSection.ACTIONS,
+  'Expand all messages',
+  'x'
+);
+describe(
+  Shortcut.COLLAPSE_ALL_MESSAGES,
+  ShortcutSection.ACTIONS,
+  'Collapse all messages',
+  'z'
+);
+describe(
+  Shortcut.REFRESH_CHANGE,
+  ShortcutSection.ACTIONS,
+  'Reload the change at the latest patch',
+  'shift+r:keyup'
+);
+describe(
+  Shortcut.TOGGLE_CHANGE_REVIEWED,
+  ShortcutSection.ACTIONS,
+  'Mark/unmark change as reviewed',
+  'r:keyup'
+);
+describe(
+  Shortcut.TOGGLE_FILE_REVIEWED,
+  ShortcutSection.ACTIONS,
+  'Toggle review flag on selected file',
+  'r:keyup'
+);
+describe(
+  Shortcut.REFRESH_CHANGE_LIST,
+  ShortcutSection.ACTIONS,
+  'Refresh list of changes',
+  'shift+r:keyup'
+);
+describe(
+  Shortcut.TOGGLE_CHANGE_STAR,
+  ShortcutSection.ACTIONS,
+  'Star/unstar change',
+  's:keydown'
+);
+describe(
+  Shortcut.OPEN_SUBMIT_DIALOG,
+  ShortcutSection.ACTIONS,
+  'Open submit dialog',
+  'shift+s'
+);
+describe(
+  Shortcut.TOGGLE_ATTENTION_SET,
+  ShortcutSection.ACTIONS,
+  'Toggle attention set status',
+  'shift+t'
+);
+describe(
+  Shortcut.EDIT_TOPIC,
+  ShortcutSection.ACTIONS,
+  'Add a change topic',
+  't'
+);
+describe(
+  Shortcut.DIFF_AGAINST_BASE,
+  ShortcutSection.DIFFS,
+  'Diff against base',
+  SPECIAL_SHORTCUT.V_KEY,
+  'down',
+  's'
+);
+describe(
+  Shortcut.DIFF_AGAINST_LATEST,
+  ShortcutSection.DIFFS,
+  'Diff against latest patchset',
+  SPECIAL_SHORTCUT.V_KEY,
+  'up',
+  'w'
+);
+describe(
+  Shortcut.DIFF_BASE_AGAINST_LEFT,
+  ShortcutSection.DIFFS,
+  'Diff base against left',
+  SPECIAL_SHORTCUT.V_KEY,
+  'left',
+  'a'
+);
+describe(
+  Shortcut.DIFF_RIGHT_AGAINST_LATEST,
+  ShortcutSection.DIFFS,
+  'Diff right against latest',
+  SPECIAL_SHORTCUT.V_KEY,
+  'right',
+  'd'
+);
+describe(
+  Shortcut.DIFF_BASE_AGAINST_LATEST,
+  ShortcutSection.DIFFS,
+  'Diff base against latest',
+  SPECIAL_SHORTCUT.V_KEY,
+  'b'
+);
+
+describe(
+  Shortcut.NEXT_LINE,
+  ShortcutSection.DIFFS,
+  'Go to next line',
+  'j',
+  'down'
+);
+describe(
+  Shortcut.PREV_LINE,
+  ShortcutSection.DIFFS,
+  'Go to previous line',
+  'k',
+  'up'
+);
+describe(
+  Shortcut.VISIBLE_LINE,
+  ShortcutSection.DIFFS,
+  'Move cursor to currently visible code',
+  '.'
+);
+describe(
+  Shortcut.NEXT_CHUNK,
+  ShortcutSection.DIFFS,
+  'Go to next diff chunk',
+  'n'
+);
+describe(
+  Shortcut.PREV_CHUNK,
+  ShortcutSection.DIFFS,
+  'Go to previous diff chunk',
+  'p'
+);
+describe(
+  Shortcut.TOGGLE_ALL_DIFF_CONTEXT,
+  ShortcutSection.DIFFS,
+  'Toggle all diff context',
+  'shift+x'
+);
+describe(
+  Shortcut.NEXT_COMMENT_THREAD,
+  ShortcutSection.DIFFS,
+  'Go to next comment thread',
+  'shift+n'
+);
+describe(
+  Shortcut.PREV_COMMENT_THREAD,
+  ShortcutSection.DIFFS,
+  'Go to previous comment thread',
+  'shift+p'
+);
+describe(
+  Shortcut.EXPAND_ALL_COMMENT_THREADS,
+  ShortcutSection.DIFFS,
+  'Expand all comment threads',
+  SPECIAL_SHORTCUT.DOC_ONLY,
+  'e'
+);
+describe(
+  Shortcut.COLLAPSE_ALL_COMMENT_THREADS,
+  ShortcutSection.DIFFS,
+  'Collapse all comment threads',
+  SPECIAL_SHORTCUT.DOC_ONLY,
+  'shift+e'
+);
+describe(
+  Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS,
+  ShortcutSection.DIFFS,
+  'Hide/Display all comment threads',
+  'h'
+);
+describe(
+  Shortcut.LEFT_PANE,
+  ShortcutSection.DIFFS,
+  'Select left pane',
+  'shift+left'
+);
+describe(
+  Shortcut.RIGHT_PANE,
+  ShortcutSection.DIFFS,
+  'Select right pane',
+  'shift+right'
+);
+describe(
+  Shortcut.TOGGLE_LEFT_PANE,
+  ShortcutSection.DIFFS,
+  'Hide/show left diff',
+  'shift+a'
+);
+describe(Shortcut.NEW_COMMENT, ShortcutSection.DIFFS, 'Draft new comment', 'c');
+describe(
+  Shortcut.SAVE_COMMENT,
+  ShortcutSection.DIFFS,
+  'Save comment',
+  'ctrl+enter',
+  'meta+enter',
+  'ctrl+s',
+  'meta+s'
+);
+describe(
+  Shortcut.OPEN_DIFF_PREFS,
+  ShortcutSection.DIFFS,
+  'Show diff preferences',
+  ','
+);
+describe(
+  Shortcut.TOGGLE_DIFF_REVIEWED,
+  ShortcutSection.DIFFS,
+  'Mark/unmark file as reviewed',
+  'r:keyup'
+);
+describe(
+  Shortcut.TOGGLE_DIFF_MODE,
+  ShortcutSection.DIFFS,
+  'Toggle unified/side-by-side diff',
+  'm:keyup'
+);
+describe(
+  Shortcut.NEXT_UNREVIEWED_FILE,
+  ShortcutSection.DIFFS,
+  'Mark file as reviewed and go to next unreviewed file',
+  'shift+m'
+);
+describe(
+  Shortcut.TOGGLE_BLAME,
+  ShortcutSection.DIFFS,
+  'Toggle blame',
+  'b:keyup'
+);
+describe(Shortcut.OPEN_FILE_LIST, ShortcutSection.DIFFS, 'Open file list', 'f');
+describe(
+  Shortcut.NEXT_FILE,
+  ShortcutSection.NAVIGATION,
+  'Go to next file',
+  ']'
+);
+describe(
+  Shortcut.PREV_FILE,
+  ShortcutSection.NAVIGATION,
+  'Go to previous file',
+  '['
+);
+describe(
+  Shortcut.NEXT_FILE_WITH_COMMENTS,
+  ShortcutSection.NAVIGATION,
+  'Go to next file that has comments',
+  'shift+j'
+);
+describe(
+  Shortcut.PREV_FILE_WITH_COMMENTS,
+  ShortcutSection.NAVIGATION,
+  'Go to previous file that has comments',
+  'shift+k'
+);
+describe(
+  Shortcut.OPEN_FIRST_FILE,
+  ShortcutSection.NAVIGATION,
+  'Go to first file',
+  ']'
+);
+describe(
+  Shortcut.OPEN_LAST_FILE,
+  ShortcutSection.NAVIGATION,
+  'Go to last file',
+  '['
+);
+describe(
+  Shortcut.UP_TO_DASHBOARD,
+  ShortcutSection.NAVIGATION,
+  'Up to dashboard',
+  'u'
+);
+describe(
+  Shortcut.UP_TO_CHANGE,
+  ShortcutSection.NAVIGATION,
+  'Up to change',
+  'u'
+);
+
+describe(
+  Shortcut.CURSOR_NEXT_FILE,
+  ShortcutSection.FILE_LIST,
+  'Select next file',
+  'j',
+  'down'
+);
+describe(
+  Shortcut.CURSOR_PREV_FILE,
+  ShortcutSection.FILE_LIST,
+  'Select previous file',
+  'k',
+  'up'
+);
+describe(
+  Shortcut.OPEN_FILE,
+  ShortcutSection.FILE_LIST,
+  'Go to selected file',
+  'o',
+  'enter'
+);
+describe(
+  Shortcut.TOGGLE_ALL_INLINE_DIFFS,
+  ShortcutSection.FILE_LIST,
+  'Show/hide all inline diffs',
+  'shift+i'
+);
+describe(
+  Shortcut.TOGGLE_INLINE_DIFF,
+  ShortcutSection.FILE_LIST,
+  'Show/hide selected inline diff',
+  'i'
+);
+
+describe(
+  Shortcut.SEND_REPLY,
+  ShortcutSection.REPLY_DIALOG,
+  'Send reply',
+  SPECIAL_SHORTCUT.DOC_ONLY,
+  'ctrl+enter',
+  'meta+enter'
+);
+describe(
+  Shortcut.EMOJI_DROPDOWN,
+  ShortcutSection.REPLY_DIALOG,
+  'Emoji dropdown',
+  SPECIAL_SHORTCUT.DOC_ONLY,
+  ':'
+);
diff --git a/polygerrit-ui/app/services/shortcuts/shortcuts-service.ts b/polygerrit-ui/app/services/shortcuts/shortcuts-service.ts
new file mode 100644
index 0000000..d0e2d49
--- /dev/null
+++ b/polygerrit-ui/app/services/shortcuts/shortcuts-service.ts
@@ -0,0 +1,317 @@
+/**
+ * @license
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {
+  config,
+  Shortcut,
+  ShortcutHelpItem,
+  ShortcutSection,
+  SPECIAL_SHORTCUT,
+} from './shortcuts-config';
+import {disableShortcuts$} from '../user/user-model';
+import {IronKeyboardEvent, isIronKeyboardEvent} from '../../types/events';
+import {isElementTarget} from '../../utils/dom-util';
+import {ReportingService} from '../gr-reporting/gr-reporting';
+
+export type SectionView = Array<{binding: string[][]; text: string}>;
+
+/**
+ * The interface for listener for shortcut events.
+ */
+export type ShortcutListener = (
+  viewMap?: Map<ShortcutSection, SectionView>
+) => void;
+
+const COMBO_KEYS = ['g', 'v'];
+
+/**
+ * Shortcuts service, holds all hosts, bindings and listeners.
+ */
+export class ShortcutsService {
+  /**
+   * Keeps track of the components that are currently active such that we can
+   * show a shortcut help dialog that only shows the shortcuts that are
+   * currently relevant.
+   */
+  private readonly activeHosts = new Map<unknown, Map<string, string>>();
+
+  /** Static map built in the constructor by iterating over the config. */
+  private readonly bindings = new Map<Shortcut, string[]>();
+
+  private readonly listeners = new Set<ShortcutListener>();
+
+  /**
+   * Maps keys (e.g. 'g') to the timestamp when they have last been pressed.
+   * This enabled key combinations like 'g+o' where we can check whether 'g' was
+   * pressed recently when 'o' is processed. Keys of this map must be items of
+   * COMBO_KEYS. Values are Date timestamps in milliseconds.
+   */
+  private readonly keyLastPressed = new Map<string, number>();
+
+  /** Keeps track of the corresponding user preference. */
+  private shortcutsDisabled = false;
+
+  constructor(readonly reporting?: ReportingService) {
+    for (const section of config.keys()) {
+      const items = config.get(section) ?? [];
+      for (const item of items) {
+        this.bindings.set(item.shortcut, item.bindings);
+      }
+    }
+    disableShortcuts$.subscribe(x => (this.shortcutsDisabled = x));
+    document.addEventListener('keydown', (e: KeyboardEvent) => {
+      if (!COMBO_KEYS.includes(e.key)) return;
+      if (this.shouldSuppress(e)) return;
+      this.keyLastPressed.set(e.key, Date.now());
+    });
+  }
+
+  public _testOnly_isEmpty() {
+    return this.activeHosts.size === 0 && this.listeners.size === 0;
+  }
+
+  shouldSuppress(event: IronKeyboardEvent | KeyboardEvent) {
+    if (this.shortcutsDisabled) return true;
+    const e = isIronKeyboardEvent(event) ? event.detail.keyboardEvent : event;
+
+    // Note that when you listen on document, then `e.currentTarget` will be the
+    // document and `e.target` will be `<gr-app>` due to shadow dom, but by
+    // using the composedPath() you can actually find the true origin of the
+    // event.
+    const rootTarget = e.composedPath()[0];
+    if (!isElementTarget(rootTarget)) return false;
+    const tagName = rootTarget.tagName;
+    const type = rootTarget.getAttribute('type');
+
+    if (
+      // Suppress shortcuts on <input> and <textarea>, but not on
+      // checkboxes, because we want to enable workflows like 'click
+      // mark-reviewed and then press ] to go to the next file'.
+      (tagName === 'INPUT' && type !== 'checkbox') ||
+      tagName === 'TEXTAREA' ||
+      // Suppress shortcuts if the key is 'enter'
+      // and target is an anchor or button or paper-tab.
+      (e.keyCode === 13 &&
+        (tagName === 'A' || tagName === 'BUTTON' || tagName === 'PAPER-TAB'))
+    ) {
+      return true;
+    }
+    const path: EventTarget[] = e.composedPath() ?? [];
+    for (const el of path) {
+      if (!isElementTarget(el)) continue;
+      if (el.tagName === 'GR-OVERLAY') return true;
+    }
+    // eg: {key: "k:keydown", ..., from: "gr-diff-view"}
+    let key = `${e.key}:${e.type}`;
+    // TODO(brohlfs): Re-enable reporting of g- and v-keys.
+    // if (this._inGoKeyMode()) key = 'g+' + key;
+    // if (this.inVKeyMode()) key = 'v+' + key;
+    if (e.shiftKey) key = 'shift+' + key;
+    if (e.ctrlKey) key = 'ctrl+' + key;
+    if (e.metaKey) key = 'meta+' + key;
+    if (e.altKey) key = 'alt+' + key;
+    let from = 'unknown';
+    if (isElementTarget(e.currentTarget)) {
+      from = e.currentTarget.tagName;
+    }
+    this.reporting?.reportInteraction('shortcut-triggered', {key, from});
+    return false;
+  }
+
+  createTitle(shortcutName: Shortcut, section: ShortcutSection) {
+    const desc = this.getDescription(section, shortcutName);
+    const shortcut = this.getShortcut(shortcutName);
+    return desc && shortcut ? `${desc} (shortcut: ${shortcut})` : '';
+  }
+
+  getBindingsForShortcut(shortcut: Shortcut) {
+    return this.bindings.get(shortcut);
+  }
+
+  attachHost(host: unknown, shortcuts: Map<string, string>) {
+    this.activeHosts.set(host, shortcuts);
+    this.notifyListeners();
+  }
+
+  detachHost(host: unknown) {
+    if (!this.activeHosts.delete(host)) return false;
+    this.notifyListeners();
+    return true;
+  }
+
+  addListener(listener: ShortcutListener) {
+    this.listeners.add(listener);
+    listener(this.directoryView());
+  }
+
+  removeListener(listener: ShortcutListener) {
+    return this.listeners.delete(listener);
+  }
+
+  getDescription(section: ShortcutSection, shortcutName: Shortcut) {
+    const bindings = config.get(section);
+    if (!bindings) return '';
+    const binding = bindings.find(binding => binding.shortcut === shortcutName);
+    return binding?.text ?? '';
+  }
+
+  getShortcut(shortcutName: Shortcut) {
+    const bindings = this.bindings.get(shortcutName);
+    if (!bindings) return '';
+    return bindings
+      .map(binding => this.describeBinding(binding).join('+'))
+      .join(',');
+  }
+
+  activeShortcutsBySection() {
+    const activeShortcuts = new Set<string>();
+    this.activeHosts.forEach(shortcuts => {
+      shortcuts.forEach((_, shortcut) => activeShortcuts.add(shortcut));
+    });
+
+    const activeShortcutsBySection = new Map<
+      ShortcutSection,
+      ShortcutHelpItem[]
+    >();
+    config.forEach((shortcutList, section) => {
+      shortcutList.forEach(shortcutHelp => {
+        if (activeShortcuts.has(shortcutHelp.shortcut)) {
+          if (!activeShortcutsBySection.has(section)) {
+            activeShortcutsBySection.set(section, []);
+          }
+          // From previous condition, the `get(section)`
+          // should always return a valid result
+          activeShortcutsBySection.get(section)!.push(shortcutHelp);
+        }
+      });
+    });
+    return activeShortcutsBySection;
+  }
+
+  directoryView() {
+    const view = new Map<ShortcutSection, SectionView>();
+    this.activeShortcutsBySection().forEach((shortcutHelps, section) => {
+      const sectionView: SectionView = [];
+      shortcutHelps.forEach(shortcutHelp => {
+        const bindingDesc = this.describeBindings(shortcutHelp.shortcut);
+        if (!bindingDesc) {
+          return;
+        }
+        this.distributeBindingDesc(bindingDesc).forEach(bindingDesc => {
+          sectionView.push({
+            binding: bindingDesc,
+            text: shortcutHelp.text,
+          });
+        });
+      });
+      view.set(section, sectionView);
+    });
+    return view;
+  }
+
+  distributeBindingDesc(bindingDesc: string[][]): string[][][] {
+    if (
+      bindingDesc.length === 1 ||
+      this.comboSetDisplayWidth(bindingDesc) < 21
+    ) {
+      return [bindingDesc];
+    }
+    // Find the largest prefix of bindings that is under the
+    // size threshold.
+    const head = [bindingDesc[0]];
+    for (let i = 1; i < bindingDesc.length; i++) {
+      head.push(bindingDesc[i]);
+      if (this.comboSetDisplayWidth(head) >= 21) {
+        head.pop();
+        return [head].concat(this.distributeBindingDesc(bindingDesc.slice(i)));
+      }
+    }
+    return [];
+  }
+
+  comboSetDisplayWidth(bindingDesc: string[][]) {
+    const bindingSizer = (binding: string[]) =>
+      binding.reduce((acc, key) => acc + key.length, 0);
+    // Width is the sum of strings + (n-1) * 2 to account for the word
+    // "or" joining them.
+    return (
+      bindingDesc.reduce((acc, binding) => acc + bindingSizer(binding), 0) +
+      2 * (bindingDesc.length - 1)
+    );
+  }
+
+  describeBindings(shortcut: Shortcut): string[][] | null {
+    const bindings = this.bindings.get(shortcut);
+    if (!bindings) {
+      return null;
+    }
+    if (bindings[0] === SPECIAL_SHORTCUT.GO_KEY) {
+      return bindings
+        .slice(1)
+        .map(binding => this._describeKey(binding))
+        .map(binding => ['g'].concat(binding));
+    }
+    if (bindings[0] === SPECIAL_SHORTCUT.V_KEY) {
+      return bindings
+        .slice(1)
+        .map(binding => this._describeKey(binding))
+        .map(binding => ['v'].concat(binding));
+    }
+
+    return bindings
+      .filter(binding => binding !== SPECIAL_SHORTCUT.DOC_ONLY)
+      .map(binding => this.describeBinding(binding));
+  }
+
+  _describeKey(key: string) {
+    switch (key) {
+      case 'shift':
+        return 'Shift';
+      case 'meta':
+        return 'Meta';
+      case 'ctrl':
+        return 'Ctrl';
+      case 'enter':
+        return 'Enter';
+      case 'up':
+        return '\u2191'; // ↑
+      case 'down':
+        return '\u2193'; // ↓
+      case 'left':
+        return '\u2190'; // ←
+      case 'right':
+        return '\u2192'; // →
+      default:
+        return key;
+    }
+  }
+
+  describeBinding(binding: string) {
+    // single key bindings
+    if (binding.length === 1) {
+      return [binding];
+    }
+    return binding
+      .split(':')[0]
+      .split('+')
+      .map(part => this._describeKey(part));
+  }
+
+  notifyListeners() {
+    const view = this.directoryView();
+    this.listeners.forEach(listener => listener(view));
+  }
+}
diff --git a/polygerrit-ui/app/services/shortcuts/shortcuts-service_test.ts b/polygerrit-ui/app/services/shortcuts/shortcuts-service_test.ts
new file mode 100644
index 0000000..0998a4c
--- /dev/null
+++ b/polygerrit-ui/app/services/shortcuts/shortcuts-service_test.ts
@@ -0,0 +1,293 @@
+/**
+ * @license
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import '../../test/common-test-setup-karma';
+import {ShortcutsService} from '../../services/shortcuts/shortcuts-service';
+import {Shortcut, ShortcutSection} from './shortcuts-config';
+import * as MockInteractions from '@polymer/iron-test-helpers/mock-interactions';
+
+async function keyEventOn(
+  el: HTMLElement,
+  callback: (e: KeyboardEvent) => void,
+  keyCode = 75,
+  key = 'k'
+): Promise<KeyboardEvent> {
+  let resolve: (e: KeyboardEvent) => void;
+  const promise = new Promise<KeyboardEvent>(r => (resolve = r));
+  el.addEventListener('keydown', (e: KeyboardEvent) => {
+    callback(e);
+    resolve(e);
+  });
+  MockInteractions.keyDownOn(el, keyCode, null, key);
+  return await promise;
+}
+
+suite('shortcuts-service tests', () => {
+  let service: ShortcutsService;
+
+  setup(() => {
+    service = new ShortcutsService();
+  });
+
+  suite('shouldSuppress', () => {
+    test('do not suppress shortcut event from <div>', async () => {
+      await keyEventOn(document.createElement('div'), e => {
+        assert.isFalse(service.shouldSuppress(e));
+      });
+    });
+
+    test('suppress shortcut event from <input>', async () => {
+      await keyEventOn(document.createElement('input'), e => {
+        assert.isTrue(service.shouldSuppress(e));
+      });
+    });
+
+    test('suppress shortcut event from <textarea>', async () => {
+      await keyEventOn(document.createElement('textarea'), e => {
+        assert.isTrue(service.shouldSuppress(e));
+      });
+    });
+
+    test('do not suppress shortcut event from checkbox <input>', async () => {
+      const inputEl = document.createElement('input');
+      inputEl.setAttribute('type', 'checkbox');
+      await keyEventOn(inputEl, e => {
+        assert.isFalse(service.shouldSuppress(e));
+      });
+    });
+
+    test('suppress shortcut event from children of <gr-overlay>', async () => {
+      const overlay = document.createElement('gr-overlay');
+      const div = document.createElement('div');
+      overlay.appendChild(div);
+      await keyEventOn(div, e => {
+        assert.isTrue(service.shouldSuppress(e));
+      });
+    });
+
+    test('suppress "enter" shortcut event from <a>', async () => {
+      await keyEventOn(document.createElement('a'), e => {
+        assert.isFalse(service.shouldSuppress(e));
+      });
+      await keyEventOn(
+        document.createElement('a'),
+        e => assert.isTrue(service.shouldSuppress(e)),
+        13,
+        'enter'
+      );
+    });
+  });
+
+  test('getShortcut', () => {
+    const NEXT_FILE = Shortcut.NEXT_FILE;
+    assert.equal(service.getShortcut(NEXT_FILE), ']');
+  });
+
+  test('getShortcut with modifiers', () => {
+    const NEXT_FILE = Shortcut.TOGGLE_LEFT_PANE;
+    assert.equal(service.getShortcut(NEXT_FILE), 'Shift+a');
+  });
+
+  suite('binding descriptions', () => {
+    function mapToObject<K, V>(m: Map<K, V>) {
+      const o: any = {};
+      m.forEach((v: V, k: K) => (o[k] = v));
+      return o;
+    }
+
+    test('single combo description', () => {
+      assert.deepEqual(service.describeBinding('a'), ['a']);
+      assert.deepEqual(service.describeBinding('a:keyup'), ['a']);
+      assert.deepEqual(service.describeBinding('ctrl+a'), ['Ctrl', 'a']);
+      assert.deepEqual(service.describeBinding('ctrl+shift+up:keyup'), [
+        'Ctrl',
+        'Shift',
+        '↑',
+      ]);
+    });
+
+    test('combo set description', () => {
+      assert.deepEqual(
+        service.describeBindings(Shortcut.GO_TO_OPENED_CHANGES),
+        [['g', 'o']]
+      );
+      assert.deepEqual(service.describeBindings(Shortcut.SAVE_COMMENT), [
+        ['Ctrl', 'Enter'],
+        ['Meta', 'Enter'],
+        ['Ctrl', 's'],
+        ['Meta', 's'],
+      ]);
+      assert.deepEqual(service.describeBindings(Shortcut.PREV_FILE), [['[']]);
+    });
+
+    test('combo set description width', () => {
+      assert.strictEqual(service.comboSetDisplayWidth([['u']]), 1);
+      assert.strictEqual(service.comboSetDisplayWidth([['g', 'o']]), 2);
+      assert.strictEqual(service.comboSetDisplayWidth([['Shift', 'r']]), 6);
+      assert.strictEqual(service.comboSetDisplayWidth([['x'], ['y']]), 4);
+      assert.strictEqual(
+        service.comboSetDisplayWidth([['x'], ['y'], ['Shift', 'z']]),
+        12
+      );
+    });
+
+    test('distribute shortcut help', () => {
+      assert.deepEqual(service.distributeBindingDesc([['o']]), [[['o']]]);
+      assert.deepEqual(service.distributeBindingDesc([['g', 'o']]), [
+        [['g', 'o']],
+      ]);
+      assert.deepEqual(
+        service.distributeBindingDesc([['ctrl', 'shift', 'meta', 'enter']]),
+        [[['ctrl', 'shift', 'meta', 'enter']]]
+      );
+      assert.deepEqual(
+        service.distributeBindingDesc([
+          ['ctrl', 'shift', 'meta', 'enter'],
+          ['o'],
+        ]),
+        [[['ctrl', 'shift', 'meta', 'enter']], [['o']]]
+      );
+      assert.deepEqual(
+        service.distributeBindingDesc([
+          ['ctrl', 'enter'],
+          ['meta', 'enter'],
+          ['ctrl', 's'],
+          ['meta', 's'],
+        ]),
+        [
+          [
+            ['ctrl', 'enter'],
+            ['meta', 'enter'],
+          ],
+          [
+            ['ctrl', 's'],
+            ['meta', 's'],
+          ],
+        ]
+      );
+    });
+
+    test('active shortcuts by section', () => {
+      assert.deepEqual(mapToObject(service.activeShortcutsBySection()), {});
+
+      service.attachHost({}, new Map([[Shortcut.NEXT_FILE, 'null']]));
+      assert.deepEqual(mapToObject(service.activeShortcutsBySection()), {
+        [ShortcutSection.NAVIGATION]: [
+          {
+            shortcut: Shortcut.NEXT_FILE,
+            text: 'Go to next file',
+            bindings: [']'],
+          },
+        ],
+      });
+
+      service.attachHost({}, new Map([[Shortcut.NEXT_LINE, 'null']]));
+      assert.deepEqual(mapToObject(service.activeShortcutsBySection()), {
+        [ShortcutSection.DIFFS]: [
+          {
+            shortcut: Shortcut.NEXT_LINE,
+            text: 'Go to next line',
+            bindings: ['j', 'down'],
+          },
+        ],
+        [ShortcutSection.NAVIGATION]: [
+          {
+            shortcut: Shortcut.NEXT_FILE,
+            text: 'Go to next file',
+            bindings: [']'],
+          },
+        ],
+      });
+
+      service.attachHost(
+        {},
+        new Map([
+          [Shortcut.SEARCH, 'null'],
+          [Shortcut.GO_TO_OPENED_CHANGES, 'null'],
+        ])
+      );
+      assert.deepEqual(mapToObject(service.activeShortcutsBySection()), {
+        [ShortcutSection.DIFFS]: [
+          {
+            shortcut: Shortcut.NEXT_LINE,
+            text: 'Go to next line',
+            bindings: ['j', 'down'],
+          },
+        ],
+        [ShortcutSection.EVERYWHERE]: [
+          {
+            shortcut: Shortcut.SEARCH,
+            text: 'Search',
+            bindings: ['/'],
+          },
+          {
+            shortcut: Shortcut.GO_TO_OPENED_CHANGES,
+            text: 'Go to Opened Changes',
+            bindings: ['GO_KEY', 'o'],
+          },
+        ],
+        [ShortcutSection.NAVIGATION]: [
+          {
+            shortcut: Shortcut.NEXT_FILE,
+            text: 'Go to next file',
+            bindings: [']'],
+          },
+        ],
+      });
+    });
+
+    test('directory view', () => {
+      assert.deepEqual(mapToObject(service.directoryView()), {});
+
+      service.attachHost(
+        {},
+        new Map([
+          [Shortcut.GO_TO_OPENED_CHANGES, 'null'],
+          [Shortcut.NEXT_FILE, 'null'],
+          [Shortcut.NEXT_LINE, 'null'],
+          [Shortcut.SAVE_COMMENT, 'null'],
+          [Shortcut.SEARCH, 'null'],
+        ])
+      );
+      assert.deepEqual(mapToObject(service.directoryView()), {
+        [ShortcutSection.DIFFS]: [
+          {binding: [['j'], ['↓']], text: 'Go to next line'},
+          {
+            binding: [
+              ['Ctrl', 'Enter'],
+              ['Meta', 'Enter'],
+            ],
+            text: 'Save comment',
+          },
+          {
+            binding: [
+              ['Ctrl', 's'],
+              ['Meta', 's'],
+            ],
+            text: 'Save comment',
+          },
+        ],
+        [ShortcutSection.EVERYWHERE]: [
+          {binding: [['/']], text: 'Search'},
+          {binding: [['g', 'o']], text: 'Go to Opened Changes'},
+        ],
+        [ShortcutSection.NAVIGATION]: [
+          {binding: [[']']], text: 'Go to next file'},
+        ],
+      });
+    });
+  });
+});
diff --git a/polygerrit-ui/app/services/user/user-model.ts b/polygerrit-ui/app/services/user/user-model.ts
index 4115a71..72ce3e1 100644
--- a/polygerrit-ui/app/services/user/user-model.ts
+++ b/polygerrit-ui/app/services/user/user-model.ts
@@ -60,3 +60,8 @@
   map(preferences => preferences?.my ?? []),
   distinctUntilChanged()
 );
+
+export const disableShortcuts$ = preferences$.pipe(
+  map(preferences => preferences?.disable_keyboard_shortcuts ?? false),
+  distinctUntilChanged()
+);
diff --git a/polygerrit-ui/app/styles/gr-a11y-styles.ts b/polygerrit-ui/app/styles/gr-a11y-styles.ts
new file mode 100644
index 0000000..a1fa62b
--- /dev/null
+++ b/polygerrit-ui/app/styles/gr-a11y-styles.ts
@@ -0,0 +1,42 @@
+/**
+ * @license
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {css} from 'lit';
+
+export const a11yStyles = css`
+  .assistive-tech-only {
+    user-select: none;
+    clip: rect(1px, 1px, 1px, 1px);
+    height: 1px;
+    margin: 0;
+    overflow: hidden;
+    padding: 0;
+    position: absolute;
+    white-space: nowrap;
+    width: 1px;
+    z-index: -1000;
+  }
+`;
+
+const $_documentContainer = document.createElement('template');
+$_documentContainer.innerHTML = `<dom-module id="gr-a11y-styles">
+  <template>
+    <style>
+    ${a11yStyles.cssText}
+    </style>
+  </template>
+</dom-module>`;
+document.head.appendChild($_documentContainer.content);
diff --git a/polygerrit-ui/app/styles/gr-hovercard-styles.ts b/polygerrit-ui/app/styles/gr-hovercard-styles.ts
new file mode 100644
index 0000000..f214a9c
--- /dev/null
+++ b/polygerrit-ui/app/styles/gr-hovercard-styles.ts
@@ -0,0 +1,51 @@
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {css} from 'lit';
+
+export const hovercardStyles = css`
+  :host {
+    position: absolute;
+    display: none;
+    z-index: 200;
+    max-width: 600px;
+    outline: none;
+  }
+  :host(.hovered) {
+    display: block;
+  }
+  :host(.hide) {
+    visibility: hidden;
+  }
+  /* You have to use a <div class="container"> in your hovercard in order
+      to pick up this consistent styling. */
+  #container {
+    background: var(--dialog-background-color);
+    border: 1px solid var(--border-color);
+    border-radius: var(--border-radius);
+    box-shadow: var(--elevation-level-5);
+  }
+`;
+
+const $_documentContainer = document.createElement('template');
+$_documentContainer.innerHTML = `<dom-module id="gr-hovercard-styles">
+  <template>
+    <style>
+    ${hovercardStyles.cssText}
+    </style>
+  </template>
+</dom-module>`;
+document.head.appendChild($_documentContainer.content);
diff --git a/polygerrit-ui/app/styles/gr-spinner-styles.ts b/polygerrit-ui/app/styles/gr-spinner-styles.ts
index 0f8341f..6015be4 100644
--- a/polygerrit-ui/app/styles/gr-spinner-styles.ts
+++ b/polygerrit-ui/app/styles/gr-spinner-styles.ts
@@ -16,13 +16,6 @@
  */
 import {css} from 'lit';
 
-// Mark the file as a module. Otherwise typescript assumes this is a script
-// and $_documentContainer is a global variable.
-// See: https://www.typescriptlang.org/docs/handbook/modules.html
-export {};
-
-const $_documentContainer = document.createElement('template');
-
 export const spinnerStyles = css`
   .loadingSpin {
     border: 2px solid var(--disabled-button-background-color);
@@ -43,6 +36,7 @@
   }
 `;
 
+const $_documentContainer = document.createElement('template');
 $_documentContainer.innerHTML = `<dom-module id="gr-spinner-styles">
   <template>
     <style>
diff --git a/polygerrit-ui/app/styles/gr-voting-styles.ts b/polygerrit-ui/app/styles/gr-voting-styles.ts
index 12d0784..a623d99 100644
--- a/polygerrit-ui/app/styles/gr-voting-styles.ts
+++ b/polygerrit-ui/app/styles/gr-voting-styles.ts
@@ -18,24 +18,26 @@
 // Mark the file as a module. Otherwise typescript assumes this is a script
 // and $_documentContainer is a global variable.
 // See: https://www.typescriptlang.org/docs/handbook/modules.html
-export {};
+import {css} from 'lit';
+
+export const votingStyles = css`
+  .voteChip {
+    border: 1px solid var(--border-color);
+    /* max rounded */
+    border-radius: 1em;
+    box-shadow: none;
+    box-sizing: border-box;
+    min-width: 3em;
+    color: var(--vote-text-color);
+  }
+`;
 
 const $_documentContainer = document.createElement('template');
-
 $_documentContainer.innerHTML = `<dom-module id="gr-voting-styles">
   <template>
     <style>
-      .voteChip {
-        border: 1px solid var(--border-color);
-        /* max rounded */
-        border-radius: 1em;
-        box-shadow: none;
-        box-sizing: border-box;
-        min-width: 3em;
-        color: var(--vote-text-color);
-      }
+    ${votingStyles.cssText}
     </style>
   </template>
 </dom-module>`;
-
 document.head.appendChild($_documentContainer.content);
diff --git a/polygerrit-ui/app/styles/shared-styles.ts b/polygerrit-ui/app/styles/shared-styles.ts
index b58d5b9..98f6eb2 100644
--- a/polygerrit-ui/app/styles/shared-styles.ts
+++ b/polygerrit-ui/app/styles/shared-styles.ts
@@ -224,19 +224,6 @@
     --iron-autogrow-textarea_-_white-space: pre-wrap;
   }
 
-  .assistive-tech-only {
-    user-select: none;
-    clip: rect(1px, 1px, 1px, 1px);
-    height: 1px;
-    margin: 0;
-    overflow: hidden;
-    padding: 0;
-    position: absolute;
-    white-space: nowrap;
-    width: 1px;
-    z-index: -1000;
-  }
-
   /**
    * TODO: Remove these rules and change (plugin) users to rely on
    * gr-spinner-styles directly.
diff --git a/polygerrit-ui/app/styles/themes/app-theme.ts b/polygerrit-ui/app/styles/themes/app-theme.ts
index f1711ac..8b00a79 100644
--- a/polygerrit-ui/app/styles/themes/app-theme.ts
+++ b/polygerrit-ui/app/styles/themes/app-theme.ts
@@ -185,6 +185,7 @@
     --vote-text-color: black;
     --status-text-color: white;
     --tooltip-text-color: white;
+    --tooltip-button-text-color: var(--gerrit-blue-dark);
     --negative-red-text-color: var(--red-600);
     --positive-green-text-color: var(--green-700);
     --indirect-ancestor-text-color: var(--green-700);
@@ -284,7 +285,7 @@
     --font-weight-bold: 500;
     --font-weight-h1: 400;
     --font-weight-h2: 400;
-    --font-weight-h3: 400;
+    --font-weight-h3: var(--font-weight-bold, 500);
     --context-control-button-font: var(--font-weight-normal) var(--font-size-normal) var(--font-family);
     --code-hint-font-weight: 500;
     --image-diff-button-font: var(--font-weight-normal) var(--font-size-normal) var(--font-family);
diff --git a/polygerrit-ui/app/styles/themes/dark-theme.ts b/polygerrit-ui/app/styles/themes/dark-theme.ts
index a5e725d..a24a666 100644
--- a/polygerrit-ui/app/styles/themes/dark-theme.ts
+++ b/polygerrit-ui/app/styles/themes/dark-theme.ts
@@ -94,7 +94,8 @@
       --reviewed-text-color: var(--gray-300);
       --vote-text-color: black;
       --status-text-color: black;
-      --tooltip-text-color: var(--gray-200);
+      --tooltip-text-color: var(--gray-900);
+      --tooltip-button-text-color: var(--gerrit-blue-light);
       --negative-red-text-color: var(--red-200);
       --positive-green-text-color: var(--green-200);
       --indirect-ancestor-text-color: var(--green-200);
@@ -115,7 +116,7 @@
       --hover-background-color: rgba(161, 194, 250, 0.2);
       --disabled-button-background-color: #484a4d;
       --selection-background-color: rgba(161, 194, 250, 0.1);
-      --tooltip-background-color: var(--gray-800);
+      --tooltip-background-color: var(--gray-200);
 
       /* comment background colors */
       --comment-background-color: #3c3f43;
diff --git a/polygerrit-ui/app/test/common-test-setup.ts b/polygerrit-ui/app/test/common-test-setup.ts
index 550d3df..949c268 100644
--- a/polygerrit-ui/app/test/common-test-setup.ts
+++ b/polygerrit-ui/app/test/common-test-setup.ts
@@ -30,9 +30,7 @@
   registerTestCleanup,
   addIronOverlayBackdropStyleEl,
   removeIronOverlayBackdropStyleEl,
-  TestKeyboardShortcutBinder,
 } from './test-utils';
-import {_testOnly_getShortcutManagerInstance} from '../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {safeTypesBridge} from '../utils/safe-types-util';
 import {_testOnly_initGerritPluginApi} from '../elements/shared/gr-js-api-interface/gr-gerrit';
 import {initGlobalVariables} from '../elements/gr-app-global-var-init';
@@ -45,6 +43,7 @@
 import {cleanUpStorage} from '../services/storage/gr-storage_mock';
 import {updatePreferences} from '../services/user/user-model';
 import {createDefaultPreferences} from '../constants/constants';
+import {appContext} from '../services/app-context';
 
 declare global {
   interface Window {
@@ -101,14 +100,13 @@
   // If the following asserts fails - then window.stub is
   // overwritten by some other code.
   assert.equal(getCleanupsCount(), 0);
+  _testOnlyInitAppContext();
   // The following calls is nessecary to avoid influence of previously executed
   // tests.
-  TestKeyboardShortcutBinder.push();
-  _testOnlyInitAppContext();
   initGlobalVariables();
   _testOnly_initGerritPluginApi();
-  const mgr = _testOnly_getShortcutManagerInstance();
-  assert.isTrue(mgr._testOnly_isEmpty());
+  const shortcuts = appContext.shortcutsService;
+  assert.isTrue(shortcuts._testOnly_isEmpty());
   const selection = document.getSelection();
   if (selection) {
     selection.removeAllRanges();
@@ -197,7 +195,6 @@
 teardown(() => {
   sinon.restore();
   cleanupTestUtils();
-  TestKeyboardShortcutBinder.pop();
   checkGlobalSpace();
   removeIronOverlayBackdropStyleEl();
   cancelAllTasks();
diff --git a/polygerrit-ui/app/test/test-utils.ts b/polygerrit-ui/app/test/test-utils.ts
index a60c1d1..1cde372 100644
--- a/polygerrit-ui/app/test/test-utils.ts
+++ b/polygerrit-ui/app/test/test-utils.ts
@@ -17,10 +17,6 @@
 import '../types/globals';
 import {_testOnly_resetPluginLoader} from '../elements/shared/gr-js-api-interface/gr-plugin-loader';
 import {_testOnly_resetEndpoints} from '../elements/shared/gr-js-api-interface/gr-plugin-endpoints';
-import {
-  _testOnly_getShortcutManagerInstance,
-  Shortcut,
-} from '../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {appContext} from '../services/app-context';
 import {RestApiService} from '../services/gr-rest-api/gr-rest-api';
 import {SinonSpy} from 'sinon';
@@ -53,44 +49,6 @@
   return getComputedStyle(el).getPropertyValue('display') !== 'none';
 }
 
-// Some tests/elements can define its own binding. We want to restore bindings
-// at the end of the test. The TestKeyboardShortcutBinder store bindings in
-// stack, so it is possible to override bindings in nested suites.
-export class TestKeyboardShortcutBinder {
-  private static stack: TestKeyboardShortcutBinder[] = [];
-
-  static push() {
-    const testBinder = new TestKeyboardShortcutBinder();
-    this.stack.push(testBinder);
-    return _testOnly_getShortcutManagerInstance();
-  }
-
-  static pop() {
-    const item = this.stack.pop();
-    if (!item) {
-      throw new Error('stack is empty');
-    }
-    item._restoreShortcuts();
-  }
-
-  private readonly originalBinding: Map<Shortcut, string[]>;
-
-  constructor() {
-    this.originalBinding = new Map(
-      _testOnly_getShortcutManagerInstance()._testOnly_getBindings()
-    );
-  }
-
-  _restoreShortcuts() {
-    const bindings =
-      _testOnly_getShortcutManagerInstance()._testOnly_getBindings();
-    bindings.clear();
-    this.originalBinding.forEach((value, key) => {
-      bindings.set(key, value);
-    });
-  }
-}
-
 // Provide reset plugins function to clear installed plugins between tests.
 // No gr-app found (running tests)
 export const resetPlugins = () => {
diff --git a/polygerrit-ui/app/tsconfig.json b/polygerrit-ui/app/tsconfig.json
index 9516dce..5040496 100644
--- a/polygerrit-ui/app/tsconfig.json
+++ b/polygerrit-ui/app/tsconfig.json
@@ -25,6 +25,7 @@
     "noUnusedLocals": true, /* Report errors on unused locals. */
     "noUnusedParameters": true, /* Report errors on unused parameters. */
     "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
+    "noImplicitOverride": true,
     "noFallthroughCasesInSwitch": true,/* Report errors for fallthrough cases in switch statement. */
 
     "skipLibCheck": true, /* Do not check node_modules */
@@ -45,6 +46,31 @@
     "typeRoots": [
       "node_modules/@types",
       "../node_modules/@types"
+    ],
+
+    "plugins": [
+      {
+        "name": "ts-lit-plugin",
+        "strict": true,
+        "rules": {
+          "no-unknown-tag-name": "error",
+          "no-unclosed-tag": "error",
+          "no-unknown-property": "error",
+          "no-unintended-mixed-binding": "error",
+          "no-invalid-boolean-binding": "error",
+          "no-expressionless-property-binding": "error",
+          "no-noncallable-event-binding": "error",
+          "no-boolean-in-attribute-binding": "error",
+          "no-complex-attribute-binding": "error",
+          "no-nullable-attribute-binding": "error",
+          "no-incompatible-type-binding": "error",
+          "no-invalid-directive-binding": "error",
+          "no-incompatible-property-type": "error",
+          "no-unknown-property-converter": "error",
+          "no-invalid-attribute-name": "error",
+          "no-invalid-tag-name": "error"
+        }
+      }
     ]
   },
   // With the * pattern (without an extension), only supported files
diff --git a/polygerrit-ui/app/types/events.ts b/polygerrit-ui/app/types/events.ts
index 0069321..c78f61a 100644
--- a/polygerrit-ui/app/types/events.ts
+++ b/polygerrit-ui/app/types/events.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {PatchSetNum} from './common';
 import {UIComment} from '../utils/comment-util';
 import {FetchRequest} from './types';
@@ -69,10 +68,6 @@
     'editable-content-save': EditableContentSaveEvent;
     'location-change': LocationChangeEvent;
     'iron-announce': IronAnnounceEvent;
-    /* prettier-ignore */
-    'keydown': KeydownEvent;
-    /* prettier-ignore */
-    'keypress': KeypressEvent;
     'line-mouse-enter': LineNumberEvent;
     'line-mouse-leave': LineNumberEvent;
     'line-cursor-moved-in': LineNumberEvent;
@@ -148,10 +143,6 @@
 }
 export type IronAnnounceEvent = CustomEvent<IronAnnounceEventDetail>;
 
-export type KeydownEvent = CustomKeyboardEvent;
-
-export type KeypressEvent = InputEvent;
-
 export interface LocationChangeEventDetail {
   hash: string;
   pathname: string;
@@ -252,20 +243,28 @@
 export type TitleChangeEvent = CustomEvent<TitleChangeEventDetail>;
 
 /**
- * Keyboard events emitted from polymer elements.
+ * Keyboard events emitted from elements using IronA11yKeysBehavior: That means
+ * that the element returns a list of handlers from either `keyBindings()` or
+ * from `keyboardShortcuts()`. This event should not be used in Lit elements
+ * and will be obsolete once the Lit migration is completed.
  */
-export interface CustomKeyboardEvent extends CustomEvent, EventApi {
-  event: CustomKeyboardEvent;
-  detail: {
-    keyboardEvent?: CustomKeyboardEvent;
-    // TODO(TS): maybe should mark as optional and check before accessing
-    key: string;
-  };
-  readonly altKey: boolean;
-  readonly changedTouches: TouchList;
-  readonly ctrlKey: boolean;
-  readonly metaKey: boolean;
-  readonly shiftKey: boolean;
-  readonly keyCode: number;
-  readonly repeat: boolean;
+export interface IronKeyboardEvent extends CustomEvent {
+  detail: IronKeyboardEventDetail;
+}
+
+export interface IronKeyboardEventDetail {
+  keyboardEvent: KeyboardEvent;
+  key: string;
+  combo?: string;
+}
+
+export function isIronKeyboardEvent(
+  e: IronKeyboardEvent | Event | CustomEvent
+): e is IronKeyboardEvent {
+  const ike = e as IronKeyboardEvent;
+  return !!ike?.detail?.keyboardEvent;
+}
+
+export interface IronKeyboardEventListener {
+  (evt: IronKeyboardEvent): void;
 }
diff --git a/polygerrit-ui/app/utils/access-util.ts b/polygerrit-ui/app/utils/access-util.ts
index 44830e2..165eacf 100644
--- a/polygerrit-ui/app/utils/access-util.ts
+++ b/polygerrit-ui/app/utils/access-util.ts
@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {LabelName} from '../types/common';
+import {GitRef, LabelName} from '../types/common';
 
 export enum AccessPermissionId {
   ABANDON = 'abandon',
@@ -156,7 +156,7 @@
 }
 
 export interface PermissionArrayItem<T> {
-  id: string;
+  id: GitRef;
   value: T;
 }
 
@@ -175,7 +175,7 @@
   return Object.keys(obj)
     .map(key => {
       return {
-        id: key,
+        id: key as GitRef,
         value: obj[key],
       };
     })
diff --git a/polygerrit-ui/app/utils/async-util.ts b/polygerrit-ui/app/utils/async-util.ts
index c82f5e4..90ee5a5 100644
--- a/polygerrit-ui/app/utils/async-util.ts
+++ b/polygerrit-ui/app/utils/async-util.ts
@@ -117,9 +117,9 @@
  * Ensure only one call is made within THROTTLE_INTERVAL_MS and any call within
  * this interval is ignored
  */
-export function throttleWrap(fn: (e: Event) => void) {
+export function throttleWrap<T>(fn: (e: T) => void) {
   let lastCall: number | undefined;
-  return (e: Event) => {
+  return (e: T) => {
     if (
       lastCall !== undefined &&
       Date.now() - lastCall < THROTTLE_INTERVAL_MS
diff --git a/polygerrit-ui/app/utils/attention-set-util.ts b/polygerrit-ui/app/utils/attention-set-util.ts
index 631b633..dcd2863 100644
--- a/polygerrit-ui/app/utils/attention-set-util.ts
+++ b/polygerrit-ui/app/utils/attention-set-util.ts
@@ -16,6 +16,7 @@
  */
 
 import {AccountInfo, ChangeInfo, ServerInfo} from '../types/common';
+import {ParsedChangeInfo} from '../types/types';
 import {
   getAccountTemplate,
   isServiceUser,
@@ -29,7 +30,7 @@
 
 export function hasAttention(
   account?: AccountInfo,
-  change?: ChangeInfo
+  change?: ChangeInfo | ParsedChangeInfo
 ): boolean {
   return (
     canHaveAttention(account) &&
@@ -41,7 +42,7 @@
 export function getReason(
   config?: ServerInfo,
   account?: AccountInfo,
-  change?: ChangeInfo
+  change?: ChangeInfo | ParsedChangeInfo
 ) {
   if (!hasAttention(account, change)) return '';
   if (change?.attention_set === undefined) return '';
diff --git a/polygerrit-ui/app/utils/change-util.ts b/polygerrit-ui/app/utils/change-util.ts
index c94493b..278e7f3 100644
--- a/polygerrit-ui/app/utils/change-util.ts
+++ b/polygerrit-ui/app/utils/change-util.ts
@@ -215,7 +215,7 @@
 }
 
 export function isUploader(
-  change?: ChangeInfo,
+  change?: ChangeInfo | ParsedChangeInfo,
   account?: AccountInfo
 ): boolean {
   if (!change || !account) return false;
@@ -224,7 +224,7 @@
 }
 
 export function isInvolved(
-  change?: ChangeInfo,
+  change?: ChangeInfo | ParsedChangeInfo,
   account?: AccountInfo
 ): boolean {
   const owner = isOwner(change, account);
diff --git a/polygerrit-ui/app/utils/common-util.ts b/polygerrit-ui/app/utils/common-util.ts
index 5370cf9..9e3bc74 100644
--- a/polygerrit-ui/app/utils/common-util.ts
+++ b/polygerrit-ui/app/utils/common-util.ts
@@ -100,16 +100,19 @@
 }
 
 export function query<E extends Element = Element>(
-  el: Element | undefined,
+  el: Element | null | undefined,
   selector: string
 ): E | undefined {
   if (!el) return undefined;
-  const root = el.shadowRoot ?? el;
-  return root.querySelector<E>(selector) ?? undefined;
+  if (el.shadowRoot) {
+    const r = el.shadowRoot.querySelector<E>(selector);
+    if (r) return r;
+  }
+  return el.querySelector<E>(selector) ?? undefined;
 }
 
 export function queryAndAssert<E extends Element = Element>(
-  el: Element | undefined,
+  el: Element | null | undefined,
   selector: string
 ): E {
   const found = query<E>(el, selector);
diff --git a/polygerrit-ui/app/utils/dom-util.ts b/polygerrit-ui/app/utils/dom-util.ts
index 16129af..ead47bb 100644
--- a/polygerrit-ui/app/utils/dom-util.ts
+++ b/polygerrit-ui/app/utils/dom-util.ts
@@ -14,10 +14,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
-import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
+import {EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {check} from './common-util';
-import {CustomKeyboardEvent} from '../types/events';
+import {IronKeyboardEvent} from '../types/events';
 
 /**
  * Event emitted from polymer elements.
@@ -37,6 +36,17 @@
   return 'shadowRoot' in el;
 }
 
+export function isElement(node: Node): node is Element {
+  return node.nodeType === 1;
+}
+
+export function isElementTarget(
+  target: EventTarget | null | undefined
+): target is Element {
+  if (!target) return false;
+  return 'nodeType' in target && isElement(target as Node);
+}
+
 // TODO: maybe should have a better name for this
 function getPathFromNode(el: EventTarget) {
   let tagName = '';
@@ -171,7 +181,7 @@
  *  getEventPath(e); // eg: div.class1>p#pid.class2
  * }
  */
-export function getEventPath<T extends PolymerEvent>(e?: T) {
+export function getEventPath<T extends MouseEvent>(e?: T) {
   if (!e) return '';
 
   let path = e.composedPath();
@@ -298,23 +308,14 @@
   return e.altKey || e.ctrlKey || e.metaKey || e.shiftKey;
 }
 
-// Deprecated. Try using "normal" KeyboardEvent and modifierPressed() above.
-export function isModifierPressed(event: CustomKeyboardEvent) {
-  const e = getKeyboardEvent(event);
-  return e.altKey || e.ctrlKey || e.metaKey || e.shiftKey;
-}
-
-export function isShiftPressed(event: CustomKeyboardEvent) {
-  const e = getKeyboardEvent(event);
+export function shiftPressed(e: KeyboardEvent) {
   return e.shiftKey;
 }
 
-export function getKeyboardEvent(e: CustomKeyboardEvent): CustomKeyboardEvent {
-  const event = dom(e.detail ? e.detail.keyboardEvent : e);
-  // TODO(TS): worth checking if this still holds or not, if no, remove this.
-  // When e is a keyboardEvent, e.event is not null.
-  if ('event' in event && (event as CustomKeyboardEvent).event) {
-    return (event as CustomKeyboardEvent).event;
-  }
-  return event as CustomKeyboardEvent;
+export function isModifierPressed(e: IronKeyboardEvent) {
+  return modifierPressed(e.detail.keyboardEvent);
+}
+
+export function isShiftPressed(e: IronKeyboardEvent) {
+  return shiftPressed(e.detail.keyboardEvent);
 }
diff --git a/polygerrit-ui/app/utils/label-util.ts b/polygerrit-ui/app/utils/label-util.ts
index cde9a45..78c4132 100644
--- a/polygerrit-ui/app/utils/label-util.ts
+++ b/polygerrit-ui/app/utils/label-util.ts
@@ -70,21 +70,33 @@
   return max > -min ? max : min;
 }
 
-export function getLabelStatus(
-  label?: DetailedLabelInfo,
-  vote?: number
-): LabelStatus {
-  const value = vote ?? getRepresentativeValue(label);
-  const range = getVotingRangeOrDefault(label);
-  if (value < 0) {
-    return value === range.min ? LabelStatus.REJECTED : LabelStatus.DISLIKED;
-  }
-  if (value > 0) {
-    return value === range.max ? LabelStatus.APPROVED : LabelStatus.RECOMMENDED;
+export function getLabelStatus(label?: LabelInfo, vote?: number): LabelStatus {
+  if (!label) return LabelStatus.NEUTRAL;
+  if (isDetailedLabelInfo(label)) {
+    const value = vote ?? getRepresentativeValue(label);
+    const range = getVotingRangeOrDefault(label);
+    if (value < 0) {
+      return value === range.min ? LabelStatus.REJECTED : LabelStatus.DISLIKED;
+    }
+    if (value > 0) {
+      return value === range.max
+        ? LabelStatus.APPROVED
+        : LabelStatus.RECOMMENDED;
+    }
+  } else if (isQuickLabelInfo(label)) {
+    if (label.approved) return LabelStatus.RECOMMENDED;
+    if (label.rejected) return LabelStatus.DISLIKED;
   }
   return LabelStatus.NEUTRAL;
 }
 
+export function hasNeutralStatus(
+  label: DetailedLabelInfo,
+  approvalInfo: ApprovalInfo
+) {
+  return getLabelStatus(label, approvalInfo.value) === LabelStatus.NEUTRAL;
+}
+
 export function classForLabelStatus(status: LabelStatus) {
   switch (status) {
     case LabelStatus.APPROVED:
@@ -122,6 +134,17 @@
   return label.all?.filter(x => x._account_id === account._account_id)[0];
 }
 
+export function getAllUniqueApprovals(labelInfo?: LabelInfo) {
+  if (!labelInfo || !isDetailedLabelInfo(labelInfo)) return [];
+  const uniqueApprovals = (labelInfo.all ?? [])
+    .filter(
+      (approvalInfo, index, array) =>
+        index === array.findIndex(other => other.value === approvalInfo.value)
+    )
+    .sort((a, b) => -(a.value ?? 0) + (b.value ?? 0));
+  return uniqueApprovals;
+}
+
 export function hasVotes(labelInfo: LabelInfo): boolean {
   if (isDetailedLabelInfo(labelInfo)) {
     return (labelInfo.all ?? []).some(
diff --git a/polygerrit-ui/app/utils/label-util_test.ts b/polygerrit-ui/app/utils/label-util_test.ts
index 196c5e9..1004aac 100644
--- a/polygerrit-ui/app/utils/label-util_test.ts
+++ b/polygerrit-ui/app/utils/label-util_test.ts
@@ -32,8 +32,11 @@
   AccountInfo,
   ApprovalInfo,
   DetailedLabelInfo,
+  LabelInfo,
+  QuickLabelInfo,
 } from '../types/common';
 import {
+  createAccountWithEmail,
   createSubmitRequirementExpressionInfo,
   createSubmitRequirementResultInfo,
 } from '../test/test-data-generators';
@@ -171,6 +174,25 @@
     assert.equal(getLabelStatus(labelInfo), LabelStatus.REJECTED);
   });
 
+  test('getLabelStatus - quicklabelinfo', () => {
+    let labelInfo: QuickLabelInfo = {};
+    assert.equal(getLabelStatus(labelInfo), LabelStatus.NEUTRAL);
+    labelInfo = {approved: createAccountWithEmail()};
+    assert.equal(getLabelStatus(labelInfo), LabelStatus.RECOMMENDED);
+    labelInfo = {rejected: createAccountWithEmail()};
+    assert.equal(getLabelStatus(labelInfo), LabelStatus.DISLIKED);
+  });
+
+  test('getLabelStatus - detailed and quick info', () => {
+    let labelInfo: LabelInfo = {all: [], values: VALUES_2};
+    labelInfo = {
+      all: [{value: 0}],
+      values: VALUES_0,
+      rejected: createAccountWithEmail(),
+    };
+    assert.equal(getLabelStatus(labelInfo), LabelStatus.NEUTRAL);
+  });
+
   test('getRepresentativeValue', () => {
     let labelInfo: DetailedLabelInfo = {all: []};
     assert.equal(getRepresentativeValue(labelInfo), 0);
diff --git a/polygerrit-ui/app/utils/path-list-util.ts b/polygerrit-ui/app/utils/path-list-util.ts
index fd922fc..411421e 100644
--- a/polygerrit-ui/app/utils/path-list-util.ts
+++ b/polygerrit-ui/app/utils/path-list-util.ts
@@ -95,13 +95,13 @@
   });
 }
 
-export function computeDisplayPath(path: string) {
+export function computeDisplayPath(path?: string) {
   if (path === SpecialFilePath.COMMIT_MESSAGE) {
     return 'Commit message';
   } else if (path === SpecialFilePath.MERGE_LIST) {
     return 'Merge list';
   }
-  return path;
+  return path ?? '';
 }
 
 export function isMagicPath(path?: string) {
diff --git a/polygerrit-ui/app/yarn.lock b/polygerrit-ui/app/yarn.lock
index 395ef64..bfca566 100644
--- a/polygerrit-ui/app/yarn.lock
+++ b/polygerrit-ui/app/yarn.lock
@@ -2,10 +2,10 @@
 # yarn lockfile v1
 
 
-"@lit/reactive-element@^1.0.0-rc.2":
-  version "1.0.0-rc.3"
-  resolved "https://registry.yarnpkg.com/@lit/reactive-element/-/reactive-element-1.0.0-rc.3.tgz#5032f493fbf39781b187a7e2dd5d256537c8760c"
-  integrity sha512-Rs2px1keOQUNJUo5B+WExl5v244ZNCiN/iMVNO9evFdJjAdWCIupR/p14zRPkNHsciRBELLTcOZ379cI9O6PDg==
+"@lit/reactive-element@^1.0.0":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@lit/reactive-element/-/reactive-element-1.0.1.tgz#853cacd4d78d79059f33f66f8e7b0e5c34bee294"
+  integrity sha512-nSD5AA2AZkKuXuvGs8IK7K5ZczLAogfDd26zT9l6S7WzvqALdVWcW5vMUiTnZyj5SPcNwNNANj0koeV1ieqTFQ==
 
 "@mapbox/node-pre-gyp@^1.0.0":
   version "1.0.5"
@@ -425,10 +425,10 @@
   resolved "https://registry.yarnpkg.com/@types/resize-observer-browser/-/resize-observer-browser-0.1.6.tgz#d8e6c2f830e2650dc06fe74464472ff64b54a302"
   integrity sha512-61IfTac0s9jvNtBCpyo86QeaN8qqpMGHdK0uGKCCIy2dt5/Yk84VduHIdWAcmkC5QvdkPL0p5eWYgUZtHKKUVg==
 
-"@types/trusted-types@^1.0.1":
-  version "1.0.6"
-  resolved "https://registry.yarnpkg.com/@types/trusted-types/-/trusted-types-1.0.6.tgz#569b8a08121d3203398290d602d84d73c8dcf5da"
-  integrity sha512-230RC8sFeHoT6sSUlRO6a8cAnclO06eeiq1QDfiv2FGCLWFvvERWgwIQD4FWqD9A69BN7Lzee4OXwoMVnnsWDw==
+"@types/trusted-types@^2.0.2":
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/@types/trusted-types/-/trusted-types-2.0.2.tgz#fc25ad9943bcac11cceb8168db4f275e0e72e756"
+  integrity sha512-F5DIZ36YVLE+PN+Zwws4kJogq47hNgX3Nx6WyDJ3kcplxyke3XIzB8uK5n/Lpm1HBsbGzd6nmGehL8cPekP+Tg==
 
 "@webcomponents/shadycss@^1.10.2", "@webcomponents/shadycss@^1.9.1":
   version "1.11.0"
@@ -473,9 +473,9 @@
   integrity sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==
 
 are-we-there-yet@~1.1.2:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz#4b35c2944f062a8bfcda66410760350fe9ddfc21"
-  integrity sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/are-we-there-yet/-/are-we-there-yet-1.1.7.tgz#b15474a932adab4ff8a50d9adfa7e4e926f21146"
+  integrity sha512-nxwy40TuMiUGqMyRHgCSWZ9FM4VAoRP4xUYSTv5ImRog+h9yISPbVH7H8fASCIzYn9wlEv4zvFL7uKDMCFQm3g==
   dependencies:
     delegates "^1.0.0"
     readable-stream "^2.0.6"
@@ -518,9 +518,9 @@
   integrity sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=
 
 codemirror-minified@^5.62.2:
-  version "5.62.2"
-  resolved "https://registry.yarnpkg.com/codemirror-minified/-/codemirror-minified-5.62.2.tgz#37d866f5f39bbd4482c60b1607c669bcb7190388"
-  integrity sha512-lQpyiEaqyEln1YDiHqq8lJcX8GkTJamecZAn0DkgdteFIVCRHnVmllOXPF+d159OSNkMi1UcKRObcU6ueBHe1A==
+  version "5.63.0"
+  resolved "https://registry.yarnpkg.com/codemirror-minified/-/codemirror-minified-5.63.0.tgz#29d1a78713a633c933a27853679afdc0bfea49cc"
+  integrity sha512-dMN2w0Qg5Zwn2p7UW3sYAoyrJ+QRBkiF5bfbQAvQ1bfqhEjGnZ++/zvOG7NivfnUbYRhSULz8lsFtzt4ldBNyQ==
 
 concat-map@0.0.1:
   version "0.0.1"
@@ -533,9 +533,9 @@
   integrity sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=
 
 core-util-is@~1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
-  integrity sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.3.tgz#a6042d3634c2b27e9328f837b965fac83808db85"
+  integrity sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==
 
 debug@4:
   version "4.3.2"
@@ -588,9 +588,9 @@
     wide-align "^1.1.0"
 
 glob@^7.1.3:
-  version "7.1.7"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.7.tgz#3b193e9233f01d42d0b3f78294bbeeb418f94a90"
-  integrity sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-7.2.0.tgz#d15535af7732e02e948f4c41628bd910293f6023"
+  integrity sha512-lmLf6gtyrPq8tTjSmrO94wBeQbFR3HbLHbuyD69wuyQkImp2hWqMGB47OX65FBkPffO641IP9jWa1z4ivqG26Q==
   dependencies:
     fs.realpath "^1.0.0"
     inflight "^1.0.4"
@@ -613,9 +613,9 @@
     debug "4"
 
 immer@^9.0.5:
-  version "9.0.5"
-  resolved "https://registry.yarnpkg.com/immer/-/immer-9.0.5.tgz#a7154f34fe7064f15f00554cc94c66cc0bf453ec"
-  integrity sha512-2WuIehr2y4lmYz9gaQzetPR2ECniCifk4ORaQbU3g5EalLt+0IVTosEPJ5BoYl/75ky2mivzdRzV8wWgQGOSYQ==
+  version "9.0.6"
+  resolved "https://registry.yarnpkg.com/immer/-/immer-9.0.6.tgz#7a96bf2674d06c8143e327cbf73539388ddf1a73"
+  integrity sha512-G95ivKpy+EvVAnAab4fVa4YGYn24J1SpEktnJX7JJ45Bd7xqME/SCplFzYFmTbrkwZbQ4xJK1xMTUYBkN6pWsQ==
 
 inflight@^1.0.4:
   version "1.0.6"
@@ -652,29 +652,29 @@
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
   integrity sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=
 
-lit-element@^3.0.0-rc.2:
-  version "3.0.0-rc.3"
-  resolved "https://registry.yarnpkg.com/lit-element/-/lit-element-3.0.0-rc.3.tgz#cece8f092d28eb6f9c6b23e4138ff5d7260897ef"
-  integrity sha512-NDe7yjW18gfYQb1GIEQr1T8sB1GUAb1HB62pdAEw+SK6lUW7OFPKQqCOlRhZ6qJXsw9KxMnyYIprLZT4FZdYdQ==
+lit-element@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/lit-element/-/lit-element-3.0.1.tgz#3c545af17d8a46268bc1dd5623a47486e6ff76f4"
+  integrity sha512-vs9uybH9ORyK49CFjoNGN85HM9h5bmisU4TQ63phe/+GYlwvY/3SIFYKdjV6xNvzz8v2MnVC+9+QOkPqh+Q3Ew==
   dependencies:
-    "@lit/reactive-element" "^1.0.0-rc.2"
-    lit-html "^2.0.0-rc.4"
+    "@lit/reactive-element" "^1.0.0"
+    lit-html "^2.0.0"
 
-lit-html@^2.0.0-rc.4:
-  version "2.0.0-rc.4"
-  resolved "https://registry.yarnpkg.com/lit-html/-/lit-html-2.0.0-rc.4.tgz#1015fa8f1f7c8c5b79999ed0bc11c3b79ff1aab5"
-  integrity sha512-WSLGu3vxq7y8q/oOd9I3zxyBELNLLiDk6gAYoKK4PGctI5fbh6lhnO/jVBdy0PV/vTc+cLJCA/occzx3YoNPeg==
+lit-html@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/lit-html/-/lit-html-2.0.1.tgz#63241015efa07bc9259b6f96f04abd052d2a1f95"
+  integrity sha512-KF5znvFdXbxTYM/GjpdOOnMsjgRcFGusTnB54ixnCTya5zUR0XqrDRj29ybuLS+jLXv1jji6Y8+g4W7WP8uL4w==
   dependencies:
-    "@types/trusted-types" "^1.0.1"
+    "@types/trusted-types" "^2.0.2"
 
-lit@2.0.0-rc.3:
-  version "2.0.0-rc.3"
-  resolved "https://registry.yarnpkg.com/lit/-/lit-2.0.0-rc.3.tgz#8b6a85268aba287c11125dfe57e88e0bc09beaff"
-  integrity sha512-UZDLWuspl7saA+WvS0e+TE3NdGGE05hOIwUPTWiibs34c5QupcEzpjB/aElt79V9bELQVNbUUwa0Ow7D1Wuszw==
+lit@2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/lit/-/lit-2.0.2.tgz#5e6f422924e0732258629fb379556b6d23f7179c"
+  integrity sha512-hKA/1YaSB+P+DvKWuR2q1Xzy/iayhNrJ3aveD0OQ9CKn6wUjsdnF/7LavDOJsKP/K5jzW/kXsuduPgRvTFrFJw==
   dependencies:
-    "@lit/reactive-element" "^1.0.0-rc.2"
-    lit-element "^3.0.0-rc.2"
-    lit-html "^2.0.0-rc.4"
+    "@lit/reactive-element" "^1.0.0"
+    lit-element "^3.0.0"
+    lit-html "^2.0.0"
 
 lru-cache@^6.0.0:
   version "6.0.0"
@@ -703,9 +703,9 @@
     brace-expansion "^1.1.7"
 
 minipass@^3.0.0:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/minipass/-/minipass-3.1.3.tgz#7d42ff1f39635482e15f9cdb53184deebd5815fd"
-  integrity sha512-Mgd2GdMVzY+x3IJ+oHnVM+KG3lA5c8tnabyJKmHSaG2kAGpudxuOf8ToDkhumF7UzME7DecbQE9uOZhNm7PuJg==
+  version "3.1.5"
+  resolved "https://registry.yarnpkg.com/minipass/-/minipass-3.1.5.tgz#71f6251b0a33a49c01b3cf97ff77eda030dff732"
+  integrity sha512-+8NzxD82XQoNKNrl1d/FSi+X8wAEWR+sbYAfIvub4Nz0d22plFG72CEVVaufV8PNf4qSslFTD8VMOxNVhHCjTw==
   dependencies:
     yallist "^4.0.0"
 
@@ -733,9 +733,11 @@
   integrity sha512-8ZtvEnA2c5aYCZYd1cvgdnU6cqwixRoYg70xPLWUws5ORTa/lnw+u4amixRS/Ac5U5mQVgp9pnlSUnbNWFaWZQ==
 
 node-fetch@^2.6.1:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.1.tgz#045bd323631f76ed2e2b55573394416b639a0052"
-  integrity sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==
+  version "2.6.5"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.5.tgz#42735537d7f080a7e5f78b6c549b7146be1742fd"
+  integrity sha512-mmlIVHJEu5rnIxgEgez6b9GgWXbkZj5YZ7fx+2r94a2E+Uirsp6HsPTPlomfdHtpt/B0cdKviwkoaM6pyvUOpQ==
+  dependencies:
+    whatwg-url "^5.0.0"
 
 nopt@^5.0.0:
   version "5.0.0"
@@ -863,9 +865,9 @@
   integrity sha1-BF+XgtARrppoA93TgrJDkrPYkPc=
 
 signal-exit@^3.0.0:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.3.tgz#a1410c2edd8f077b08b4e253c8eacfcaf057461c"
-  integrity sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==
+  version "3.0.5"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.5.tgz#9e3e8cc0c75a99472b44321033a7702e7738252f"
+  integrity sha512-KWcOiKeQj6ZyXx7zq4YxSMgHRlod4czeBQZrPb8OKcohcqAXShm7E20kEMle9WBt26hFcAf0qLOcp5zmY7kOqQ==
 
 simple-concat@^1.0.0:
   version "1.0.1"
@@ -920,9 +922,9 @@
     ansi-regex "^3.0.0"
 
 tar@^6.1.0:
-  version "6.1.8"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.8.tgz#4fc50cfe56511c538ce15b71e05eebe66530cbd4"
-  integrity sha512-sb9b0cp855NbkMJcskdSYA7b11Q8JsX4qe4pyUAfHp+Y6jBjJeek2ZVlwEfWayshEIwlIzXx0Fain3QG9JPm2A==
+  version "6.1.11"
+  resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.11.tgz#6760a38f003afa1b2ffd0ffe9e9abbd0eab3d621"
+  integrity sha512-an/KZQzQUkZCkuoAA64hM92X0Urb6VpRhAFllDzz44U2mcD5scmT3zBc4VgVpkugF580+DQn8eAFSyoQt0tznA==
   dependencies:
     chownr "^2.0.0"
     fs-minipass "^2.0.0"
@@ -931,6 +933,11 @@
     mkdirp "^1.0.3"
     yallist "^4.0.0"
 
+tr46@~0.0.3:
+  version "0.0.3"
+  resolved "https://registry.yarnpkg.com/tr46/-/tr46-0.0.3.tgz#8184fd347dac9cdc185992f3a6622e14b9d9ab6a"
+  integrity sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o=
+
 tslib@^1.9.0:
   version "1.14.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
@@ -941,6 +948,19 @@
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
   integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
 
+webidl-conversions@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-3.0.1.tgz#24534275e2a7bc6be7bc86611cc16ae0a5654871"
+  integrity sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE=
+
+whatwg-url@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/whatwg-url/-/whatwg-url-5.0.0.tgz#966454e8765462e37644d3626f6742ce8b70965d"
+  integrity sha1-lmRU6HZUYuN2RNNib2dCzotwll0=
+  dependencies:
+    tr46 "~0.0.3"
+    webidl-conversions "^3.0.0"
+
 wide-align@^1.1.0:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/wide-align/-/wide-align-1.1.3.tgz#ae074e6bdc0c14a431e804e624549c633b000457"
diff --git a/resources/com/google/gerrit/server/mail/ChangeHeader.soy b/resources/com/google/gerrit/server/mail/ChangeHeader.soy
index 5dfe671..3d0edab 100644
--- a/resources/com/google/gerrit/server/mail/ChangeHeader.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeHeader.soy
@@ -20,10 +20,10 @@
   {@param attentionSet: ?}
   {if $attentionSet}
     Attention is currently required from:{sp}
-    {for $attentionSetUser in $attentionSet}
+    {for $attentionSetUser, $index in $attentionSet}
       {$attentionSetUser}
       // add commas or dot.
-      {if isLast($attentionSetUser)}.
+      {if $index == length($attentionSet) - 1}.
       {else},{sp}
       {/if}
     {/for}
diff --git a/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy b/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy
index 191737f..0d8da38 100644
--- a/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy
@@ -21,10 +21,10 @@
   {@param attentionSet: ?}
   {if $attentionSet}
     <p> Attention is currently required from:{sp}
-    {for $attentionSetUser in $attentionSet}
+    {for $attentionSetUser, $index in $attentionSet}
       {$attentionSetUser}
       //add commas or dot.
-      {if isLast($attentionSetUser)}.
+      {if $index == length($attentionSet) - 1}.
       {else},{sp}
       {/if}
     {/for} </p>
diff --git a/resources/com/google/gerrit/server/mail/Comment.soy b/resources/com/google/gerrit/server/mail/Comment.soy
index 4b923e6..4b66401 100644
--- a/resources/com/google/gerrit/server/mail/Comment.soy
+++ b/resources/com/google/gerrit/server/mail/Comment.soy
@@ -48,8 +48,8 @@
         {\n}
       {/if}
 
-      {for $line in $comment.lines}
-        {if isFirst($line)}
+      {for $line, $index in $comment.lines}
+        {if $index == 0}
           {if $comment.startLine != 0}
             {$comment.link}
           {/if}
diff --git a/resources/com/google/gerrit/server/mail/DeleteReviewer.soy b/resources/com/google/gerrit/server/mail/DeleteReviewer.soy
index a3ed3ee..ae2a9c4 100644
--- a/resources/com/google/gerrit/server/mail/DeleteReviewer.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteReviewer.soy
@@ -26,8 +26,8 @@
   {@param email: ?}
   {@param fromName: ?}
   {$fromName} has removed{sp}
-  {for $reviewerName in $email.reviewerNames}
-    {if not isFirst($reviewerName)},{sp}{/if}
+  {for $reviewerName, $index in $email.reviewerNames}
+    {if $index > 0},{sp}{/if}
     {$reviewerName}
   {/for}{sp}
   from this change.{sp}
diff --git a/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy b/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy
index 76a9199..fdcbbe7 100644
--- a/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy
@@ -25,9 +25,9 @@
     {$fromName}{sp}
     <strong>
       removed{sp}
-      {for $reviewerName in $email.reviewerNames}
-        {if not isFirst($reviewerName)}
-          {if isLast($reviewerName)}{sp}and{else},{/if}{sp}
+      {for $reviewerName, $index in $email.reviewerNames}
+        {if $index > 0}
+          {if $index == (length($email.reviewerNames) - 1)}{sp}and{else},{/if}{sp}
         {/if}
         {$reviewerName}
       {/for}
diff --git a/resources/com/google/gerrit/server/mail/NewChange.soy b/resources/com/google/gerrit/server/mail/NewChange.soy
index aa2b946..c5f34b4 100644
--- a/resources/com/google/gerrit/server/mail/NewChange.soy
+++ b/resources/com/google/gerrit/server/mail/NewChange.soy
@@ -30,8 +30,8 @@
   {if $email.reviewerNames or $email.removedReviewerNames}
    {if $email.reviewerNames}
       Hello{sp}
-      {for $reviewerName in $email.reviewerNames}
-        {if not isFirst($reviewerName)},{sp}{/if}
+      {for $reviewerName, $index in $email.reviewerNames}
+        {if $index > 0},{sp}{/if}
         {$reviewerName}
       {/for},
 
@@ -43,8 +43,8 @@
     {/if}
     {if $email.removedReviewerNames}
       {$fromName} has removed{sp}
-      {for $reviewerName in $email.removedReviewerNames}
-        {if not isFirst($reviewerName)},{sp}{/if}
+      {for $reviewerName, $index in $email.removedReviewerNames}
+        {if $index > 0},{sp}{/if}
         {$reviewerName}
       {/for}{sp}
       from this change.{sp}
diff --git a/resources/com/google/gerrit/server/mail/NewChangeHtml.soy b/resources/com/google/gerrit/server/mail/NewChangeHtml.soy
index 272c3ef..008226f 100644
--- a/resources/com/google/gerrit/server/mail/NewChangeHtml.soy
+++ b/resources/com/google/gerrit/server/mail/NewChangeHtml.soy
@@ -29,9 +29,9 @@
     {if $email.reviewerNames or $email.removedReviewerNames}
       {if $email.reviewerNames}
         {$fromName} would like{sp}
-        {for $reviewerName in $email.reviewerNames}
-          {if not isFirst($reviewerName)}
-            {if isLast($reviewerName)}{sp}and{else},{/if}{sp}
+        {for $reviewerName, $index in $email.reviewerNames}
+          {if $index > 0}
+            {if $index == length($email.reviewerNames) - 1}{sp}and{else},{/if}{sp}
           {/if}
           {$reviewerName}
         {/for}{sp}
@@ -44,9 +44,9 @@
           {$fromName}{sp}
           <strong>
             removed{sp}
-            {for $reviewerName in $email.removedReviewerNames}
-              {if not isFirst($reviewerName)}
-                {if isLast($reviewerName)}{sp}and{else},{/if}{sp}
+            {for $reviewerName, $index in $email.removedReviewerNames}
+              {if $index > 0}
+                {if $index == length($email.removedReviewerNames) - 1}{sp}and{else},{/if}{sp}
               {/if}
               {$reviewerName}
             {/for}
diff --git a/tools/BUILD b/tools/BUILD
index 5af4dae..9f12373 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -202,7 +202,7 @@
         "-Xep:FromTemporalAccessor:ERROR",
         "-Xep:FunctionalInterfaceClash:ERROR",
         "-Xep:FunctionalInterfaceMethodChanged:ERROR",
-        "-Xep:FutureReturnValueIgnored:ERROR",
+        # "-Xep:FutureReturnValueIgnored:ERROR", // this check has a bug.
         "-Xep:FuturesGetCheckedIllegalExceptionType:ERROR",
         "-Xep:GetClassOnAnnotation:ERROR",
         "-Xep:GetClassOnClass:ERROR",
diff --git a/twinkie.patch b/twinkie.patch
deleted file mode 100644
index 0a61243..0000000
--- a/twinkie.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- a/node_modules/twinkie/src/app/index.js
-+++ b/node_modules/twinkie/src/app/index.js
-@@ -250,7 +250,7 @@ twinkie --tsconfig tsconfig.json --outdir output_dir [--files file_list] [--outt
-                 incremental: false,
-                 noEmit: true,
-             },
--            files: [...allProgramFilesNames, generatedFiles],
-+            files: [...allProgramFilesNames, ...generatedFiles],
-         };
-         fs.writeFileSync(cmdLineOptions.outputTsConfig, JSON.stringify(tsconfigContent, null, 2));
-     }
diff --git a/yarn.lock b/yarn.lock
index 7e13131..3ddfac6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -30,6 +30,13 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
+"@babel/runtime@^7.10.2":
+  version "7.15.4"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.15.4.tgz#fd17d16bfdf878e6dd02d19753a39fa8a8d9c84a"
+  integrity sha512-99catp6bHCaxr4sJ/DbTGgHS4+Rs2RVd2g7iOap6SLGPDknRK9ztKNsE/Fg6QhSeh1FGE5f6gHGQmvvn3I3xhw==
+  dependencies:
+    regenerator-runtime "^0.13.4"
+
 "@bazel/rollup@^3.5.0":
   version "3.8.0"
   resolved "https://registry.yarnpkg.com/@bazel/rollup/-/rollup-3.8.0.tgz#850f56176d73e3b7d99a43c7e33df21ecc6ac161"
@@ -79,6 +86,14 @@
   resolved "https://registry.yarnpkg.com/@humanwhocodes/object-schema/-/object-schema-1.2.0.tgz#87de7af9c231826fdd68ac7258f77c429e0e5fcf"
   integrity sha512-wdppn25U8z/2yiaT6YGquE6X8sSv7hNMWSXYSSU1jGv/yd6XqjXgTDJ8KP4NgjTXfJ3GbRjeeb8RTV7a/VpM+w==
 
+"@mrmlnc/readdir-enhanced@^2.2.1":
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz#524af240d1a360527b730475ecfa1344aa540dde"
+  integrity sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==
+  dependencies:
+    call-me-maybe "^1.0.1"
+    glob-to-regexp "^0.3.0"
+
 "@nodelib/fs.scandir@2.1.5":
   version "2.1.5"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5"
@@ -92,6 +107,11 @@
   resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz#5bd262af94e9d25bd1e71b05deed44876a222e8b"
   integrity sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==
 
+"@nodelib/fs.stat@^1.1.2":
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz#2b5a3ab3f918cca48a8c754c08168e3f03eba61b"
+  integrity sha512-shAmDyaQC4H92APFoIaVDHCx5bStIocgvbwQyxPRrbUY20V1EYTbSDchWbuwlMG3V17cprZhA6+78JfB+3DTPw==
+
 "@nodelib/fs.walk@^1.2.3":
   version "1.2.8"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz#e95737e8bb6746ddedf69c556953494f196fe69a"
@@ -191,9 +211,9 @@
   integrity sha512-jhuKLIRrhvCPLqwPcx6INqmKeiA5EWrsCOPhrlFSrbrmU4ZMPjj5Ul/oLCMDO98XRUIwVm78xICz4EPCektzeQ==
 
 "@types/node@*":
-  version "16.7.10"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.7.10.tgz#7aa732cc47341c12a16b7d562f519c2383b6d4fc"
-  integrity sha512-S63Dlv4zIPb8x6MMTgDq5WWRJQe56iBEY0O3SOFA9JrRienkOVDXSXBjjJw6HTNQYSE2JI6GMCR6LVbIMHJVvA==
+  version "16.9.6"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.9.6.tgz#040a64d7faf9e5d9e940357125f0963012e66f04"
+  integrity sha512-YHUZhBOMTM3mjFkXVcK+WwAcYmyhe1wL4lfqNtzI0b3qAy7yuSetnM7QJazgE5PFmgVTNGiLOgRFfJMqW7XpSQ==
 
 "@types/node@^10.1.0":
   version "10.17.60"
@@ -354,6 +374,21 @@
   dependencies:
     sprintf-js "~1.0.2"
 
+arr-diff@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-4.0.0.tgz#d6461074febfec71e7e15235761a329a5dc7c520"
+  integrity sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=
+
+arr-flatten@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/arr-flatten/-/arr-flatten-1.1.0.tgz#36048bbff4e7b47e136644316c99669ea5ae91f1"
+  integrity sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==
+
+arr-union@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/arr-union/-/arr-union-3.1.0.tgz#e39b09aea9def866a8f206e288af63919bae39c4"
+  integrity sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=
+
 array-includes@^3.1.3:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/array-includes/-/array-includes-3.1.3.tgz#c7f619b382ad2afaf5326cddfdc0afc61af7690a"
@@ -370,6 +405,11 @@
   resolved "https://registry.yarnpkg.com/array-union/-/array-union-2.1.0.tgz#b798420adbeb1de828d84acd8a2e23d3efe85e8d"
   integrity sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==
 
+array-unique@^0.3.2:
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.3.2.tgz#a894b75d4bc4f6cd679ef3244a9fd8f46ae2d428"
+  integrity sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=
+
 array.prototype.flat@^1.2.4:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/array.prototype.flat/-/array.prototype.flat-1.2.4.tgz#6ef638b43312bd401b4c6199fdec7e2dc9e9a123"
@@ -384,16 +424,39 @@
   resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
   integrity sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=
 
+assign-symbols@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
+  integrity sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
+
 astral-regex@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-2.0.0.tgz#483143c567aeed4785759c0865786dc77d7d2e31"
   integrity sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==
 
+atob@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
+  integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
+
 balanced-match@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz#e83e3a7e3f300b34cb9d87f615fa0cbf357690ee"
   integrity sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==
 
+base@^0.11.1:
+  version "0.11.2"
+  resolved "https://registry.yarnpkg.com/base/-/base-0.11.2.tgz#7bde5ced145b6d551a90db87f83c558b4eb48a8f"
+  integrity sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==
+  dependencies:
+    cache-base "^1.0.1"
+    class-utils "^0.3.5"
+    component-emitter "^1.2.1"
+    define-property "^1.0.0"
+    isobject "^3.0.1"
+    mixin-deep "^1.2.0"
+    pascalcase "^0.1.1"
+
 boolbase@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
@@ -421,6 +484,22 @@
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
+braces@^2.3.1:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/braces/-/braces-2.3.2.tgz#5979fd3f14cd531565e5fa2df1abfff1dfaee729"
+  integrity sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==
+  dependencies:
+    arr-flatten "^1.1.0"
+    array-unique "^0.3.2"
+    extend-shallow "^2.0.1"
+    fill-range "^4.0.0"
+    isobject "^3.0.1"
+    repeat-element "^1.1.2"
+    snapdragon "^0.8.1"
+    snapdragon-node "^2.0.1"
+    split-string "^3.0.2"
+    to-regex "^3.0.1"
+
 braces@^3.0.1:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/braces/-/braces-3.0.2.tgz#3454e1a462ee8d599e236df336cd9ea4f8afe107"
@@ -433,6 +512,21 @@
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.2.tgz#2b146a6fd72e80b4f55d255f35ed59a3a9a41bd5"
   integrity sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==
 
+cache-base@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/cache-base/-/cache-base-1.0.1.tgz#0a7f46416831c8b662ee36fe4e7c59d76f666ab2"
+  integrity sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==
+  dependencies:
+    collection-visit "^1.0.0"
+    component-emitter "^1.2.1"
+    get-value "^2.0.6"
+    has-value "^1.0.0"
+    isobject "^3.0.1"
+    set-value "^2.0.0"
+    to-object-path "^0.3.0"
+    union-value "^1.0.0"
+    unset-value "^1.0.0"
+
 cacheable-request@^6.0.0:
   version "6.1.0"
   resolved "https://registry.yarnpkg.com/cacheable-request/-/cacheable-request-6.1.0.tgz#20ffb8bd162ba4be11e9567d823db651052ca912"
@@ -454,6 +548,11 @@
     function-bind "^1.1.1"
     get-intrinsic "^1.0.2"
 
+call-me-maybe@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/call-me-maybe/-/call-me-maybe-1.0.1.tgz#26d208ea89e37b5cbde60250a15f031c16a4d66b"
+  integrity sha1-JtII6onje1y95gJQoV8DHBak1ms=
+
 callsites@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73"
@@ -468,7 +567,7 @@
     map-obj "^4.0.0"
     quick-lru "^4.0.1"
 
-camelcase@^5.3.1:
+camelcase@^5.0.0, camelcase@^5.3.1:
   version "5.3.1"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
   integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
@@ -478,7 +577,7 @@
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-6.2.0.tgz#924af881c9d525ac9d87f40d964e5cea982a1809"
   integrity sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==
 
-chalk@^2.0.0:
+chalk@^2.0.0, chalk@^2.4.2:
   version "2.4.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
   integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
@@ -517,6 +616,16 @@
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
   integrity sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==
 
+class-utils@^0.3.5:
+  version "0.3.6"
+  resolved "https://registry.yarnpkg.com/class-utils/-/class-utils-0.3.6.tgz#f93369ae8b9a7ce02fd41faad0ca83033190c463"
+  integrity sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==
+  dependencies:
+    arr-union "^3.1.0"
+    define-property "^0.2.5"
+    isobject "^3.0.0"
+    static-extend "^0.1.1"
+
 cli-boxes@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-2.2.1.tgz#ddd5035d25094fce220e9cab40a45840a440318f"
@@ -534,6 +643,15 @@
   resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-3.0.0.tgz#a2f48437a2caa9a22436e794bf071ec9e61cedf6"
   integrity sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw==
 
+cliui@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/cliui/-/cliui-6.0.0.tgz#511d702c0c4e41ca156d7d0e96021f23e13225b1"
+  integrity sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==
+  dependencies:
+    string-width "^4.2.0"
+    strip-ansi "^6.0.0"
+    wrap-ansi "^6.2.0"
+
 clone-response@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/clone-response/-/clone-response-1.0.2.tgz#d1dc973920314df67fbeb94223b4ee350239e96b"
@@ -541,6 +659,14 @@
   dependencies:
     mimic-response "^1.0.0"
 
+collection-visit@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/collection-visit/-/collection-visit-1.0.0.tgz#4bc0373c164bc3291b4d368c829cf1a80a59dca0"
+  integrity sha1-S8A3PBZLwykbTTaMgpzxqApZ3KA=
+  dependencies:
+    map-visit "^1.0.0"
+    object-visit "^1.0.0"
+
 color-convert@^1.9.0:
   version "1.9.3"
   resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.3.tgz#bb71850690e1f136567de629d2d5471deda4c1e8"
@@ -575,6 +701,11 @@
   resolved "https://registry.yarnpkg.com/comment-parser/-/comment-parser-1.1.5.tgz#453627ef8f67dbcec44e79a9bd5baa37f0bce9b2"
   integrity sha512-RePCE4leIhBlmrqiYTvaqEeGYg7qpSl4etaIabKtdOQVi+mSTIBBklGUwIr79GXYnl3LpMwmDw4KeR2stNc6FA==
 
+component-emitter@^1.2.1:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.3.0.tgz#16e4070fba8ae29b679f2215853ee181ab2eabc0"
+  integrity sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==
+
 concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
@@ -592,6 +723,11 @@
     write-file-atomic "^3.0.0"
     xdg-basedir "^4.0.0"
 
+copy-descriptor@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/copy-descriptor/-/copy-descriptor-0.1.1.tgz#676f6eb3c39997c2ee1ac3a924fd6124748f578d"
+  integrity sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=
+
 cross-spawn@^7.0.2, cross-spawn@^7.0.3:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
@@ -621,7 +757,7 @@
   resolved "https://registry.yarnpkg.com/css-what/-/css-what-2.1.3.tgz#a6d7604573365fe74686c3f311c56513d88285f2"
   integrity sha512-a+EPoD+uZiNfh+5fxw2nO9QwFa6nJe2Or35fGY6Ipw1R3R4AGz1d1TEZrCegvw2YTmZ0jXirGYlzxxpYSHwpEg==
 
-debug@^2.6.9:
+debug@^2.2.0, debug@^2.3.3, debug@^2.6.9:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   integrity sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
@@ -655,6 +791,11 @@
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
   integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
 
+decode-uri-component@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
+  integrity sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=
+
 decompress-response@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/decompress-response/-/decompress-response-3.3.0.tgz#80a4dd323748384bfa248083622aedec982adff3"
@@ -684,6 +825,37 @@
   dependencies:
     object-keys "^1.0.12"
 
+define-property@^0.2.5:
+  version "0.2.5"
+  resolved "https://registry.yarnpkg.com/define-property/-/define-property-0.2.5.tgz#c35b1ef918ec3c990f9a5bc57be04aacec5c8116"
+  integrity sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=
+  dependencies:
+    is-descriptor "^0.1.0"
+
+define-property@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/define-property/-/define-property-1.0.0.tgz#769ebaaf3f4a63aad3af9e8d304c9bbe79bfb0e6"
+  integrity sha1-dp66rz9KY6rTr56NMEybvnm/sOY=
+  dependencies:
+    is-descriptor "^1.0.0"
+
+define-property@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/define-property/-/define-property-2.0.2.tgz#d459689e8d654ba77e02a817f8710d702cb16e9d"
+  integrity sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==
+  dependencies:
+    is-descriptor "^1.0.2"
+    isobject "^3.0.1"
+
+didyoumean2@4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/didyoumean2/-/didyoumean2-4.1.0.tgz#f813cb7c82c249443e599be077f76e88f24b85e4"
+  integrity sha512-qTBmfQoXvhKO75D/05C8m+fteQmn4U46FWYiLhXtZQInzitXLWY0EQ/2oKnpAz9g2lQWW8jYcLcT+hPJGT+kig==
+  dependencies:
+    "@babel/runtime" "^7.10.2"
+    leven "^3.1.0"
+    lodash.deburr "^4.1.0"
+
 dir-glob@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/dir-glob/-/dir-glob-3.0.1.tgz#56dbf73d992a4a93ba1584f4534063fd2e41717f"
@@ -954,6 +1126,15 @@
     semver "^7.3.5"
     spdx-expression-parse "^3.0.1"
 
+eslint-plugin-lit@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-lit/-/eslint-plugin-lit-1.5.1.tgz#e5b86fee4aeb6023ad4bb90b3d9e462ca8eff755"
+  integrity sha512-pYB0QM11uyOk5L55QfGhBmWi8a56PkNsnx+zVpY4bxz9YVquEo4BeRnFmf9AwFyT89rhGud9QruFhM2xJ4piwg==
+  dependencies:
+    parse5 "^6.0.1"
+    parse5-htmlparser2-tree-adapter "^6.0.1"
+    requireindex "^1.2.0"
+
 eslint-plugin-node@^11.1.0:
   version "11.1.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-node/-/eslint-plugin-node-11.1.0.tgz#c95544416ee4ada26740a30474eefc5402dc671d"
@@ -973,6 +1154,11 @@
   dependencies:
     prettier-linter-helpers "^1.0.0"
 
+eslint-plugin-regex@^1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-regex/-/eslint-plugin-regex-1.8.0.tgz#4bd111cf5235fb76a4a7f77d7ffcb7b3777b8a77"
+  integrity sha512-rmzVvpoxHKgvcYDo9d1X9RMFOtyOV3A6taD3KWE6gIID2dHoc8RPd0YAjDSJ0LG35wnehQBfsNB+F7q4eYqXqw==
+
 eslint-scope@^5.1.1:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-5.1.1.tgz#e786e59a66cb92b3f6c1fb0d508aab174848f48c"
@@ -1109,6 +1295,34 @@
     signal-exit "^3.0.3"
     strip-final-newline "^2.0.0"
 
+expand-brackets@^2.1.4:
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/expand-brackets/-/expand-brackets-2.1.4.tgz#b77735e315ce30f6b6eff0f83b04151a22449622"
+  integrity sha1-t3c14xXOMPa27/D4OwQVGiJEliI=
+  dependencies:
+    debug "^2.3.3"
+    define-property "^0.2.5"
+    extend-shallow "^2.0.1"
+    posix-character-classes "^0.1.0"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.1"
+
+extend-shallow@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-2.0.1.tgz#51af7d614ad9a9f610ea1bafbb989d6b1c56890f"
+  integrity sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=
+  dependencies:
+    is-extendable "^0.1.0"
+
+extend-shallow@^3.0.0, extend-shallow@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-3.0.2.tgz#26a71aaf073b39fb2127172746131c2704028db8"
+  integrity sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=
+  dependencies:
+    assign-symbols "^1.0.0"
+    is-extendable "^1.0.1"
+
 external-editor@^3.0.3:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/external-editor/-/external-editor-3.1.0.tgz#cb03f740befae03ea4d283caed2741a83f335495"
@@ -1118,6 +1332,20 @@
     iconv-lite "^0.4.24"
     tmp "^0.0.33"
 
+extglob@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/extglob/-/extglob-2.0.4.tgz#ad00fe4dc612a9232e8718711dc5cb5ab0285543"
+  integrity sha512-Nmb6QXkELsuBr24CJSkilo6UHHgbekK5UiZgfE6UHD3Eb27YC6oD+bhcT+tJ6cl8dmsgdQxnWlcry8ksBIBLpw==
+  dependencies:
+    array-unique "^0.3.2"
+    define-property "^1.0.0"
+    expand-brackets "^2.1.4"
+    extend-shallow "^2.0.1"
+    fragment-cache "^0.2.1"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.1"
+
 fast-deep-equal@^3.1.1, fast-deep-equal@^3.1.3:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
@@ -1128,7 +1356,19 @@
   resolved "https://registry.yarnpkg.com/fast-diff/-/fast-diff-1.2.0.tgz#73ee11982d86caaf7959828d519cfe927fac5f03"
   integrity sha512-xJuoT5+L99XlZ8twedaRf6Ax2TgQVxvgZOYoPKqZufmJib0tL2tegPBOZb1pVNgIhlqDlA0eO0c3wBvQcmzx4w==
 
-fast-glob@^3.1.1:
+fast-glob@^2.2.6:
+  version "2.2.7"
+  resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-2.2.7.tgz#6953857c3afa475fff92ee6015d52da70a4cd39d"
+  integrity sha512-g1KuQwHOZAmOZMuBtHdxDtju+T2RT8jgCC9aANsbpdiDDTSnjgfuVsIBNKbUeJI3oKMRExcfNDtJl4OhbffMsw==
+  dependencies:
+    "@mrmlnc/readdir-enhanced" "^2.2.1"
+    "@nodelib/fs.stat" "^1.1.2"
+    glob-parent "^3.1.0"
+    is-glob "^4.0.0"
+    merge2 "^1.2.3"
+    micromatch "^3.1.10"
+
+fast-glob@^3.1.1, fast-glob@^3.2.2:
   version "3.2.7"
   resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-3.2.7.tgz#fd6cb7a2d7e9aa7a7846111e85a196d6b2f766a1"
   integrity sha512-rYGMRwip6lUMvYD3BTScMwT1HtAs2d71SMv66Vrxs0IekGZEjhM0pcMfjQPnknBt2zeCwQMEupiN02ZP4DiT1Q==
@@ -1170,6 +1410,16 @@
   dependencies:
     flat-cache "^3.0.4"
 
+fill-range@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-4.0.0.tgz#d544811d428f98eb06a63dc402d2403c328c38f7"
+  integrity sha1-1USBHUKPmOsGpj3EAtJAPDKMOPc=
+  dependencies:
+    extend-shallow "^2.0.1"
+    is-number "^3.0.0"
+    repeat-string "^1.6.1"
+    to-regex-range "^2.1.0"
+
 fill-range@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-7.0.1.tgz#1919a6a7c75fe38b2c7c77e5198535da9acdda40"
@@ -1205,6 +1455,18 @@
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.2.2.tgz#64bfed5cb68fe3ca78b3eb214ad97b63bedce561"
   integrity sha512-JaTY/wtrcSyvXJl4IMFHPKyFur1sE9AUqc0QnhOaJ0CxHtAoIV8pYDzeEfAaNEtGkOfq4gr3LBFmdXW5mOQFnA==
 
+for-in@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
+  integrity sha1-gQaNKVqBQuwKxybG4iAMMPttXoA=
+
+fragment-cache@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/fragment-cache/-/fragment-cache-0.2.1.tgz#4290fad27f13e89be7f33799c6bc5a0abfff0d19"
+  integrity sha1-QpD60n8T6Jvn8zeZxrxaCr//DRk=
+  dependencies:
+    map-cache "^0.2.2"
+
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
@@ -1225,6 +1487,11 @@
   resolved "https://registry.yarnpkg.com/functional-red-black-tree/-/functional-red-black-tree-1.0.1.tgz#1b0ab3bd553b2a0d6399d29c0e3ea0b252078327"
   integrity sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=
 
+get-caller-file@^2.0.1:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-2.0.5.tgz#4f94412a82db32f36e3b0b9741f8a97feb031f7e"
+  integrity sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==
+
 get-intrinsic@^1.0.2, get-intrinsic@^1.1.0, get-intrinsic@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/get-intrinsic/-/get-intrinsic-1.1.1.tgz#15f59f376f855c446963948f0d24cd3637b4abc6"
@@ -1253,6 +1520,19 @@
   resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-6.0.1.tgz#a262d8eef67aced57c2852ad6167526a43cbf7b7"
   integrity sha512-ts6Wi+2j3jQjqi70w5AlN8DFnkSwC+MqmxEzdEALB2qXZYV3X/b1CTfgPLGJNMeAWxdPfU8FO1ms3NUfaHCPYg==
 
+get-value@^2.0.3, get-value@^2.0.6:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/get-value/-/get-value-2.0.6.tgz#dc15ca1c672387ca76bd37ac0a395ba2042a2c28"
+  integrity sha1-3BXKHGcjh8p2vTesCjlbogQqLCg=
+
+glob-parent@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-3.1.0.tgz#9e6af6299d8d3bd2bd40430832bd113df906c5ae"
+  integrity sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=
+  dependencies:
+    is-glob "^3.1.0"
+    path-dirname "^1.0.0"
+
 glob-parent@^5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.2.tgz#869832c58034fe68a4093c17dc15e8340d8401c4"
@@ -1260,6 +1540,11 @@
   dependencies:
     is-glob "^4.0.1"
 
+glob-to-regexp@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/glob-to-regexp/-/glob-to-regexp-0.3.0.tgz#8c5a1494d2066c570cc3bfe4496175acc4d502ab"
+  integrity sha1-jFoUlNIGbFcMw7/kSWF1rMTVAqs=
+
 glob@^7.1.3:
   version "7.1.7"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.7.tgz#3b193e9233f01d42d0b3f78294bbeeb418f94a90"
@@ -1374,6 +1659,37 @@
   dependencies:
     has-symbols "^1.0.2"
 
+has-value@^0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/has-value/-/has-value-0.3.1.tgz#7b1f58bada62ca827ec0a2078025654845995e1f"
+  integrity sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=
+  dependencies:
+    get-value "^2.0.3"
+    has-values "^0.1.4"
+    isobject "^2.0.0"
+
+has-value@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/has-value/-/has-value-1.0.0.tgz#18b281da585b1c5c51def24c930ed29a0be6b177"
+  integrity sha1-GLKB2lhbHFxR3vJMkw7SmgvmsXc=
+  dependencies:
+    get-value "^2.0.6"
+    has-values "^1.0.0"
+    isobject "^3.0.0"
+
+has-values@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/has-values/-/has-values-0.1.4.tgz#6d61de95d91dfca9b9a02089ad384bff8f62b771"
+  integrity sha1-bWHeldkd/Km5oCCJrThL/49it3E=
+
+has-values@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/has-values/-/has-values-1.0.0.tgz#95b0b63fec2146619a6fe57fe75628d5a39efe4f"
+  integrity sha1-lbC2P+whRmGab+V/51Yo1aOe/k8=
+  dependencies:
+    is-number "^3.0.0"
+    kind-of "^4.0.0"
+
 has-yarn@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/has-yarn/-/has-yarn-2.1.0.tgz#137e11354a7b5bf11aa5cb649cf0c6f3ff2b2e77"
@@ -1521,6 +1837,20 @@
     has "^1.0.3"
     side-channel "^1.0.4"
 
+is-accessor-descriptor@^0.1.6:
+  version "0.1.6"
+  resolved "https://registry.yarnpkg.com/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz#a9e12cb3ae8d876727eeef3843f8a0897b5c98d6"
+  integrity sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=
+  dependencies:
+    kind-of "^3.0.2"
+
+is-accessor-descriptor@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz#169c2f6d3df1f992618072365c9b0ea1f6878656"
+  integrity sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==
+  dependencies:
+    kind-of "^6.0.0"
+
 is-arrayish@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
@@ -1541,6 +1871,11 @@
     call-bind "^1.0.2"
     has-tostringtag "^1.0.0"
 
+is-buffer@^1.1.5:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
+  integrity sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w==
+
 is-callable@^1.1.4, is-callable@^1.2.3:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/is-callable/-/is-callable-1.2.4.tgz#47301d58dd0259407865547853df6d61fe471945"
@@ -1560,6 +1895,20 @@
   dependencies:
     has "^1.0.3"
 
+is-data-descriptor@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz#0b5ee648388e2c860282e793f1856fec3f301b56"
+  integrity sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=
+  dependencies:
+    kind-of "^3.0.2"
+
+is-data-descriptor@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz#d84876321d0e7add03990406abbbbd36ba9268c7"
+  integrity sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==
+  dependencies:
+    kind-of "^6.0.0"
+
 is-date-object@^1.0.1:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/is-date-object/-/is-date-object-1.0.5.tgz#0841d5536e724c25597bf6ea62e1bd38298df31f"
@@ -1567,7 +1916,37 @@
   dependencies:
     has-tostringtag "^1.0.0"
 
-is-extglob@^2.1.1:
+is-descriptor@^0.1.0:
+  version "0.1.6"
+  resolved "https://registry.yarnpkg.com/is-descriptor/-/is-descriptor-0.1.6.tgz#366d8240dde487ca51823b1ab9f07a10a78251ca"
+  integrity sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==
+  dependencies:
+    is-accessor-descriptor "^0.1.6"
+    is-data-descriptor "^0.1.4"
+    kind-of "^5.0.0"
+
+is-descriptor@^1.0.0, is-descriptor@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/is-descriptor/-/is-descriptor-1.0.2.tgz#3b159746a66604b04f8c81524ba365c5f14d86ec"
+  integrity sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==
+  dependencies:
+    is-accessor-descriptor "^1.0.0"
+    is-data-descriptor "^1.0.0"
+    kind-of "^6.0.2"
+
+is-extendable@^0.1.0, is-extendable@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-0.1.1.tgz#62b110e289a471418e3ec36a617d472e301dfc89"
+  integrity sha1-YrEQ4omkcUGOPsNqYX1HLjAd/Ik=
+
+is-extendable@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-1.0.1.tgz#a7470f9e426733d81bd81e1155264e3a3507cab4"
+  integrity sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==
+  dependencies:
+    is-plain-object "^2.0.4"
+
+is-extglob@^2.1.0, is-extglob@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
   integrity sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=
@@ -1582,6 +1961,13 @@
   resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz#f116f8064fe90b3f7844a38997c0b75051269f1d"
   integrity sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==
 
+is-glob@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-3.1.0.tgz#7ba5ae24217804ac70707b96922567486cc3e84a"
+  integrity sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=
+  dependencies:
+    is-extglob "^2.1.0"
+
 is-glob@^4.0.0, is-glob@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-4.0.1.tgz#7567dbe9f2f5e2467bc77ab83c4a29482407a5dc"
@@ -1614,6 +2000,13 @@
   dependencies:
     has-tostringtag "^1.0.0"
 
+is-number@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-3.0.0.tgz#24fd6201a4782cf50561c810276afc7d12d71195"
+  integrity sha1-JP1iAaR4LPUFYcgQJ2r8fRLXEZU=
+  dependencies:
+    kind-of "^3.0.2"
+
 is-number@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/is-number/-/is-number-7.0.0.tgz#7535345b896734d5f80c4d06c50955527a14f12b"
@@ -1634,6 +2027,13 @@
   resolved "https://registry.yarnpkg.com/is-plain-obj/-/is-plain-obj-1.1.0.tgz#71a50c8429dfca773c92a390a4a03b39fcd51d3e"
   integrity sha1-caUMhCnfync8kqOQpKA7OfzVHT4=
 
+is-plain-object@^2.0.3, is-plain-object@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/is-plain-object/-/is-plain-object-2.0.4.tgz#2c163b3fafb1b606d9d17928f05c2a1c38e07677"
+  integrity sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==
+  dependencies:
+    isobject "^3.0.1"
+
 is-regex@^1.1.3:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.1.4.tgz#eef5663cd59fa4c0ae339505323df6854bb15958"
@@ -1666,16 +2066,38 @@
   resolved "https://registry.yarnpkg.com/is-typedarray/-/is-typedarray-1.0.0.tgz#e479c80858df0c1b11ddda6940f96011fcda4a9a"
   integrity sha1-5HnICFjfDBsR3dppQPlgEfzaSpo=
 
+is-windows@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
+  integrity sha512-eXK1UInq2bPmjyX6e3VHIzMLobc4J94i4AWn+Hpq3OU5KkrRC96OAcR3PRJ/pGu6m8TRnBHP9dkXQVsT/COVIA==
+
 is-yarn-global@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/is-yarn-global/-/is-yarn-global-0.3.0.tgz#d502d3382590ea3004893746754c89139973e232"
   integrity sha512-VjSeb/lHmkoyd8ryPVIKvOCn4D1koMqY+vqyjjUfc3xyKtP4dYOxM44sZrnqQSzSds3xyOrUTLTC9LVCVgLngw==
 
+isarray@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
+  integrity sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=
+
 isexe@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
   integrity sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=
 
+isobject@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/isobject/-/isobject-2.1.0.tgz#f065561096a3f1da2ef46272f815c840d87e0c89"
+  integrity sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=
+  dependencies:
+    isarray "1.0.0"
+
+isobject@^3.0.0, isobject@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/isobject/-/isobject-3.0.1.tgz#4e431e92b11a9731636aa1f9c8d1ccbcfdab78df"
+  integrity sha1-TkMekrEalzFjaqH5yNHMvP2reN8=
+
 js-tokens@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
@@ -1745,7 +2167,26 @@
   dependencies:
     json-buffer "3.0.0"
 
-kind-of@^6.0.3:
+kind-of@^3.0.2, kind-of@^3.0.3, kind-of@^3.2.0:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-3.2.2.tgz#31ea21a734bab9bbb0f32466d893aea51e4a3c64"
+  integrity sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=
+  dependencies:
+    is-buffer "^1.1.5"
+
+kind-of@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-4.0.0.tgz#20813df3d712928b207378691a45066fae72dd57"
+  integrity sha1-IIE989cSkosgc3hpGkUGb65y3Vc=
+  dependencies:
+    is-buffer "^1.1.5"
+
+kind-of@^5.0.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-5.1.0.tgz#729c91e2d857b7a419a1f9aa65685c4c33f5845d"
+  integrity sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==
+
+kind-of@^6.0.0, kind-of@^6.0.2, kind-of@^6.0.3:
   version "6.0.3"
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.3.tgz#07c05034a6c349fa06e24fa35aa76db4580ce4dd"
   integrity sha512-dcS1ul+9tmeD95T+x28/ehLgd9mENa3LsvDTtzm3vyBEO7RPptvAD+t44WVXaUjTBRcrpFeFlC8WCruUR456hw==
@@ -1757,6 +2198,11 @@
   dependencies:
     package-json "^6.3.0"
 
+leven@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/leven/-/leven-3.1.0.tgz#77891de834064cccba82ae7842bb6b14a13ed7f2"
+  integrity sha512-qsda+H8jTaUaN/x5vzW2rzc+8Rw4TAQ/4KjB46IwK5VH+IlVeeeje/EoZRpiXvIqjFgK84QffqPztGI3VBLG1A==
+
 levn@^0.4.1:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.4.1.tgz#ae4562c007473b932a6200d403268dd2fffc6ade"
@@ -1770,6 +2216,20 @@
   resolved "https://registry.yarnpkg.com/lines-and-columns/-/lines-and-columns-1.1.6.tgz#1c00c743b433cd0a4e80758f7b64a57440d9ff00"
   integrity sha1-HADHQ7QzzQpOgHWPe2SldEDZ/wA=
 
+lit-analyzer@1.2.1, lit-analyzer@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/lit-analyzer/-/lit-analyzer-1.2.1.tgz#725331a4019ae870dd631d4dd709d39a237161ea"
+  integrity sha512-OEARBhDidyaQENavLbzpTKbEmu5rnAI+SdYsH4ia1BlGlLiqQXoym7uH1MaRPtwtUPbkhUfT4OBDZ+74VHc3Cg==
+  dependencies:
+    chalk "^2.4.2"
+    didyoumean2 "4.1.0"
+    fast-glob "^2.2.6"
+    parse5 "5.1.0"
+    ts-simple-type "~1.0.5"
+    vscode-css-languageservice "4.3.0"
+    vscode-html-languageservice "3.1.0"
+    web-component-analyzer "~1.1.1"
+
 load-json-file@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-4.0.0.tgz#2f5f45ab91e33216234fd53adab668eb4ec0993b"
@@ -1800,6 +2260,11 @@
   resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
   integrity sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=
 
+lodash.deburr@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/lodash.deburr/-/lodash.deburr-4.1.0.tgz#ddb1bbb3ef07458c0177ba07de14422cb033ff9b"
+  integrity sha1-3bG7s+8HRYwBd7oH3hRCLLAz/5s=
+
 lodash.merge@^4.6.2:
   version "4.6.2"
   resolved "https://registry.yarnpkg.com/lodash.merge/-/lodash.merge-4.6.2.tgz#558aa53b43b661e1925a0afdfa36a9a1085fe57a"
@@ -1844,6 +2309,11 @@
   dependencies:
     semver "^6.0.0"
 
+map-cache@^0.2.2:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/map-cache/-/map-cache-0.2.2.tgz#c32abd0bd6525d9b051645bb4f26ac5dc98a0dbf"
+  integrity sha1-wyq9C9ZSXZsFFkW7TyasXcmKDb8=
+
 map-obj@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-1.0.1.tgz#d933ceb9205d82bdcf4886f6742bdc2b4dea146d"
@@ -1854,6 +2324,13 @@
   resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-4.2.1.tgz#e4ea399dbc979ae735c83c863dd31bdf364277b7"
   integrity sha512-+WA2/1sPmDj1dlvvJmB5G6JKfY9dpn7EVBUL06+y6PoljPkh+6V1QihwxNkbcGxCRjt2b0F9K0taiCuo7MbdFQ==
 
+map-visit@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/map-visit/-/map-visit-1.0.0.tgz#ecdca8f13144e660f1b5bd41f12f3479d98dfb8f"
+  integrity sha1-7Nyo8TFE5mDxtb1B8S80edmN+48=
+  dependencies:
+    object-visit "^1.0.0"
+
 meow@^9.0.0:
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/meow/-/meow-9.0.0.tgz#cd9510bc5cac9dee7d03c73ee1f9ad959f4ea364"
@@ -1877,11 +2354,30 @@
   resolved "https://registry.yarnpkg.com/merge-stream/-/merge-stream-2.0.0.tgz#52823629a14dd00c9770fb6ad47dc6310f2c1f60"
   integrity sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w==
 
-merge2@^1.3.0:
+merge2@^1.2.3, merge2@^1.3.0:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.4.1.tgz#4368892f885e907455a6fd7dc55c0c9d404990ae"
   integrity sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==
 
+micromatch@^3.1.10:
+  version "3.1.10"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-3.1.10.tgz#70859bc95c9840952f359a068a3fc49f9ecfac23"
+  integrity sha512-MWikgl9n9M3w+bpsY3He8L+w9eF9338xRl8IAO5viDizwSzziFEyUzo2xrrloB64ADbTf8uA8vRqqttDTOmccg==
+  dependencies:
+    arr-diff "^4.0.0"
+    array-unique "^0.3.2"
+    braces "^2.3.1"
+    define-property "^2.0.2"
+    extend-shallow "^3.0.2"
+    extglob "^2.0.4"
+    fragment-cache "^0.2.1"
+    kind-of "^6.0.2"
+    nanomatch "^1.2.9"
+    object.pick "^1.3.0"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.2"
+
 micromatch@^4.0.4:
   version "4.0.4"
   resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.4.tgz#896d519dfe9db25fce94ceb7a500919bf881ebf9"
@@ -1933,6 +2429,14 @@
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
   integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
 
+mixin-deep@^1.2.0:
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.2.tgz#1120b43dc359a785dce65b55b82e257ccf479566"
+  integrity sha512-WRoDn//mXBiJ1H40rqa3vH0toePwSsGb45iInWlTySa+Uu4k3tYUSxa2v1KqAiLtvlrSzaExqS1gtk96A9zvEA==
+  dependencies:
+    for-in "^1.0.2"
+    is-extendable "^1.0.1"
+
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
@@ -1953,6 +2457,23 @@
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.8.tgz#1630c42b2251ff81e2a283de96a5497ea92e5e0d"
   integrity sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==
 
+nanomatch@^1.2.9:
+  version "1.2.13"
+  resolved "https://registry.yarnpkg.com/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
+  integrity sha512-fpoe2T0RbHwBTBUOftAfBPaDEi06ufaUai0mE6Yn1kacc3SnTErfb/h+X94VXzI64rKFHYImXSvdwGGCmwOqCA==
+  dependencies:
+    arr-diff "^4.0.0"
+    array-unique "^0.3.2"
+    define-property "^2.0.2"
+    extend-shallow "^3.0.2"
+    fragment-cache "^0.2.1"
+    is-windows "^1.0.2"
+    kind-of "^6.0.2"
+    object.pick "^1.3.0"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.1"
+
 natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
@@ -2002,6 +2523,15 @@
   dependencies:
     boolbase "~1.0.0"
 
+object-copy@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/object-copy/-/object-copy-0.1.0.tgz#7e7d858b781bd7c991a41ba975ed3812754e998c"
+  integrity sha1-fn2Fi3gb18mRpBupde04EnVOmYw=
+  dependencies:
+    copy-descriptor "^0.1.0"
+    define-property "^0.2.5"
+    kind-of "^3.0.3"
+
 object-inspect@^1.11.0, object-inspect@^1.9.0:
   version "1.11.0"
   resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.11.0.tgz#9dceb146cedd4148a0d9e51ab88d34cf509922b1"
@@ -2012,6 +2542,13 @@
   resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-1.1.1.tgz#1c47f272df277f3b1daf061677d9c82e2322c60e"
   integrity sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==
 
+object-visit@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/object-visit/-/object-visit-1.0.1.tgz#f79c4493af0c5377b59fe39d395e41042dd045bb"
+  integrity sha1-95xEk68MU3e1n+OdOV5BBC3QRbs=
+  dependencies:
+    isobject "^3.0.0"
+
 object.assign@^4.1.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/object.assign/-/object.assign-4.1.2.tgz#0ed54a342eceb37b38ff76eb831a0e788cb63940"
@@ -2022,6 +2559,13 @@
     has-symbols "^1.0.1"
     object-keys "^1.1.1"
 
+object.pick@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/object.pick/-/object.pick-1.3.0.tgz#87a10ac4c1694bd2e1cbf53591a66141fb5dd747"
+  integrity sha1-h6EKxMFpS9Lhy/U1kaZhQftd10c=
+  dependencies:
+    isobject "^3.0.1"
+
 object.values@^1.1.4:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/object.values/-/object.values-1.1.4.tgz#0d273762833e816b693a637d30073e7051535b30"
@@ -2140,6 +2684,18 @@
     json-parse-even-better-errors "^2.3.0"
     lines-and-columns "^1.1.6"
 
+parse5-htmlparser2-tree-adapter@^6.0.1:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/parse5-htmlparser2-tree-adapter/-/parse5-htmlparser2-tree-adapter-6.0.1.tgz#2cdf9ad823321140370d4dbf5d3e92c7c8ddc6e6"
+  integrity sha512-qPuWvbLgvDGilKc5BoicRovlT4MtYT6JfJyBOMDsKoiT+GiuP5qyrPCnR9HcPECIJJmZh5jRndyNThnhhb/vlA==
+  dependencies:
+    parse5 "^6.0.1"
+
+parse5@5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/parse5/-/parse5-5.1.0.tgz#c59341c9723f414c452975564c7c00a68d58acd2"
+  integrity sha512-fxNG2sQjHvlVAYmzBZS9YlDp6PTSSDwa98vkD4QgVDDCAo84z5X1t5XyJQ62ImdLXx5NdIIfihey6xpum9/gRQ==
+
 parse5@^3.0.1:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/parse5/-/parse5-3.0.3.tgz#042f792ffdd36851551cf4e9e066b3874ab45b5c"
@@ -2147,6 +2703,21 @@
   dependencies:
     "@types/node" "*"
 
+parse5@^6.0.1:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/parse5/-/parse5-6.0.1.tgz#e1a1c085c569b3dc08321184f19a39cc27f7c30b"
+  integrity sha512-Ofn/CTFzRGTTxwpNEs9PP93gXShHcTq255nzRYSKe8AkVpZY7e1fpmTfOyoIvjP5HG7Z2ZM7VS9PPhQGW2pOpw==
+
+pascalcase@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/pascalcase/-/pascalcase-0.1.1.tgz#b363e55e8006ca6fe21784d2db22bd15d7917f14"
+  integrity sha1-s2PlXoAGym/iF4TS2yK9FdeRfxQ=
+
+path-dirname@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/path-dirname/-/path-dirname-1.0.2.tgz#cc33d24d525e099a5388c0336c6e32b9160609e0"
+  integrity sha1-zDPSTVJeCZpTiMAzbG4yuRYGCeA=
+
 path-exists@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-3.0.0.tgz#ce0ebeaa5f78cb18925ea7d810d7b59b010fd515"
@@ -2208,6 +2779,11 @@
   dependencies:
     find-up "^2.1.0"
 
+posix-character-classes@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
+  integrity sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=
+
 prelude-ls@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"
@@ -2352,6 +2928,19 @@
     indent-string "^4.0.0"
     strip-indent "^3.0.0"
 
+regenerator-runtime@^0.13.4:
+  version "0.13.9"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.9.tgz#8925742a98ffd90814988d7566ad30ca3b263b52"
+  integrity sha512-p3VT+cOEgxFsRRA9X4lkI1E+k2/CtnKtU4gcxyaCUreilL/vqI6CdZ3wxVUx3UOUg+gnUOQQcRI7BmSI656MYA==
+
+regex-not@^1.0.0, regex-not@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/regex-not/-/regex-not-1.0.2.tgz#1f4ece27e00b0b65e0247a6810e6a85d83a5752c"
+  integrity sha512-J6SDjUgDxQj5NusnOtdFxDwN/+HWykR8GELwctJ7mdqhcyy1xEc4SRFHUXvxTp661YaVKAjfRLZ9cCqS6tn32A==
+  dependencies:
+    extend-shallow "^3.0.2"
+    safe-regex "^1.1.0"
+
 regexpp@^3.0.0, regexpp@^3.1.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.2.0.tgz#0425a2768d8f23bad70ca4b90461fa2f1213e1b2"
@@ -2376,16 +2965,46 @@
   dependencies:
     rc "^1.2.8"
 
+repeat-element@^1.1.2:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/repeat-element/-/repeat-element-1.1.4.tgz#be681520847ab58c7568ac75fbfad28ed42d39e9"
+  integrity sha512-LFiNfRcSu7KK3evMyYOuCzv3L10TW7yC1G2/+StMjK8Y6Vqd2MG7r/Qjw4ghtuCOjFvlnms/iMmLqpvW/ES/WQ==
+
+repeat-string@^1.6.1:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/repeat-string/-/repeat-string-1.6.1.tgz#8dcae470e1c88abc2d600fff4a776286da75e637"
+  integrity sha1-jcrkcOHIirwtYA//Sndihtp15jc=
+
+require-directory@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"
+  integrity sha1-jGStX9MNqxyXbiNE/+f3kqam30I=
+
 require-from-string@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-2.0.2.tgz#89a7fdd938261267318eafe14f9c32e598c36909"
   integrity sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==
 
+require-main-filename@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-2.0.0.tgz#d0b329ecc7cc0f61649f62215be69af54aa8989b"
+  integrity sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==
+
+requireindex@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/requireindex/-/requireindex-1.2.0.tgz#3463cdb22ee151902635aa6c9535d4de9c2ef1ef"
+  integrity sha512-L9jEkOi3ASd9PYit2cwRfyppc9NoABujTP8/5gFcbERmo5jUoAKovIC3fsF17pkTnGsrByysqX+Kxd2OTNI1ww==
+
 resolve-from@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-4.0.0.tgz#4abcd852ad32dd7baabfe9b40e00a36db5f392e6"
   integrity sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==
 
+resolve-url@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
+  integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
+
 resolve@^1.10.0, resolve@^1.10.1, resolve@^1.20.0:
   version "1.20.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.20.0.tgz#629a013fb3f70755d6f0b7935cc1c2c5378b1975"
@@ -2409,6 +3028,11 @@
     onetime "^5.1.0"
     signal-exit "^3.0.2"
 
+ret@~0.1.10:
+  version "0.1.15"
+  resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
+  integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
+
 reusify@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.0.4.tgz#90da382b1e126efc02146e90845a88db12925d76"
@@ -2452,6 +3076,13 @@
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
   integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
 
+safe-regex@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/safe-regex/-/safe-regex-1.1.0.tgz#40a3669f3b077d1e943d44629e157dd48023bf2e"
+  integrity sha1-QKNmnzsHfR6UPURinhV91IAjvy4=
+  dependencies:
+    ret "~0.1.10"
+
 "safer-buffer@>= 2.1.2 < 3":
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
@@ -2486,6 +3117,21 @@
   dependencies:
     lru-cache "^6.0.0"
 
+set-blocking@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
+  integrity sha1-BF+XgtARrppoA93TgrJDkrPYkPc=
+
+set-value@^2.0.0, set-value@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/set-value/-/set-value-2.0.1.tgz#a18d40530e6f07de4228c7defe4227af8cad005b"
+  integrity sha512-JxHc1weCN68wRY0fhCoXpyK55m/XPHafOmK4UWD7m2CI14GMcFypt4w/0+NV5f/ZMby2F6S2wwA7fgynh9gWSw==
+  dependencies:
+    extend-shallow "^2.0.1"
+    is-extendable "^0.1.1"
+    is-plain-object "^2.0.3"
+    split-string "^3.0.1"
+
 shebang-command@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-2.0.0.tgz#ccd0af4f8835fbdc265b82461aaf0c36663f34ea"
@@ -2526,6 +3172,47 @@
     astral-regex "^2.0.0"
     is-fullwidth-code-point "^3.0.0"
 
+snapdragon-node@^2.0.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/snapdragon-node/-/snapdragon-node-2.1.1.tgz#6c175f86ff14bdb0724563e8f3c1b021a286853b"
+  integrity sha512-O27l4xaMYt/RSQ5TR3vpWCAB5Kb/czIcqUFOM/C4fYcLnbZUc1PkjTAMjof2pBWaSTwOUd6qUHcFGVGj7aIwnw==
+  dependencies:
+    define-property "^1.0.0"
+    isobject "^3.0.0"
+    snapdragon-util "^3.0.1"
+
+snapdragon-util@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/snapdragon-util/-/snapdragon-util-3.0.1.tgz#f956479486f2acd79700693f6f7b805e45ab56e2"
+  integrity sha512-mbKkMdQKsjX4BAL4bRYTj21edOf8cN7XHdYUJEe+Zn99hVEYcMvKPct1IqNe7+AZPirn8BCDOQBHQZknqmKlZQ==
+  dependencies:
+    kind-of "^3.2.0"
+
+snapdragon@^0.8.1:
+  version "0.8.2"
+  resolved "https://registry.yarnpkg.com/snapdragon/-/snapdragon-0.8.2.tgz#64922e7c565b0e14204ba1aa7d6964278d25182d"
+  integrity sha512-FtyOnWN/wCHTVXOMwvSv26d+ko5vWlIDD6zoUJ7LW8vh+ZBC8QdljveRP+crNrtBwioEUWy/4dMtbBjA4ioNlg==
+  dependencies:
+    base "^0.11.1"
+    debug "^2.2.0"
+    define-property "^0.2.5"
+    extend-shallow "^2.0.1"
+    map-cache "^0.2.2"
+    source-map "^0.5.6"
+    source-map-resolve "^0.5.0"
+    use "^3.1.0"
+
+source-map-resolve@^0.5.0:
+  version "0.5.3"
+  resolved "https://registry.yarnpkg.com/source-map-resolve/-/source-map-resolve-0.5.3.tgz#190866bece7553e1f8f267a2ee82c606b5509a1a"
+  integrity sha512-Htz+RnsXWk5+P2slx5Jh3Q66vhQj1Cllm0zvnaY98+NFx+Dv2CF/f5O/t8x+KaNdrdIAsruNzoh/KpialbqAnw==
+  dependencies:
+    atob "^2.1.2"
+    decode-uri-component "^0.2.0"
+    resolve-url "^0.2.1"
+    source-map-url "^0.4.0"
+    urix "^0.1.0"
+
 source-map-support@0.5.9:
   version "0.5.9"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.9.tgz#41bc953b2534267ea2d605bccfa7bfa3111ced5f"
@@ -2542,6 +3229,16 @@
     buffer-from "^1.0.0"
     source-map "^0.6.0"
 
+source-map-url@^0.4.0:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.1.tgz#0af66605a745a5a2f91cf1bbf8a7afbc283dec56"
+  integrity sha512-cPiFOTLUKvJFIg4SKVScy4ilPPW6rFgMgfuZJPNoDuMs3nC1HbMUycBoJw77xFIp6z1UJQJOfx6C9GMH80DiTw==
+
+source-map@^0.5.6:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
+  integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
+
 source-map@^0.6.0:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
@@ -2578,11 +3275,26 @@
   resolved "https://registry.yarnpkg.com/spdx-license-ids/-/spdx-license-ids-3.0.10.tgz#0d9becccde7003d6c658d487dd48a32f0bf3014b"
   integrity sha512-oie3/+gKf7QtpitB0LYLETe+k8SifzsX4KixvpOsbI6S0kRiRQ5MKOio8eMSAKQ17N06+wdEOXRiId+zOxo0hA==
 
+split-string@^3.0.1, split-string@^3.0.2:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/split-string/-/split-string-3.1.0.tgz#7cb09dda3a86585705c64b39a6466038682e8fe2"
+  integrity sha512-NzNVhJDYpwceVVii8/Hu6DKfD2G+NrQHlS/V/qgv763EYudVwEcMQNxd2lh+0VrUByXN/oJkl5grOhYWvQUYiw==
+  dependencies:
+    extend-shallow "^3.0.0"
+
 sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
   integrity sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=
 
+static-extend@^0.1.1:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/static-extend/-/static-extend-0.1.2.tgz#60809c39cbff55337226fd5e0b520f341f1fb5c6"
+  integrity sha1-YICcOcv/VTNyJv1eC1IPNB8ftcY=
+  dependencies:
+    define-property "^0.2.5"
+    object-copy "^0.1.0"
+
 string-width@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/string-width/-/string-width-3.1.0.tgz#22767be21b62af1081574306f69ac51b62203961"
@@ -2717,11 +3429,26 @@
   dependencies:
     os-tmpdir "~1.0.2"
 
+to-object-path@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/to-object-path/-/to-object-path-0.3.0.tgz#297588b7b0e7e0ac08e04e672f85c1f4999e17af"
+  integrity sha1-KXWIt7Dn4KwI4E5nL4XB9JmeF68=
+  dependencies:
+    kind-of "^3.0.2"
+
 to-readable-stream@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/to-readable-stream/-/to-readable-stream-1.0.0.tgz#ce0aa0c2f3df6adf852efb404a783e77c0475771"
   integrity sha512-Iq25XBt6zD5npPhlLVXGFN3/gyR2/qODcKNNyTMd4vbm39HUaOiAM4PMq0eMVC/Tkxz+Zjdsc55g9yyz+Yq00Q==
 
+to-regex-range@^2.1.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/to-regex-range/-/to-regex-range-2.1.1.tgz#7c80c17b9dfebe599e27367e0d4dd5590141db38"
+  integrity sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg=
+  dependencies:
+    is-number "^3.0.0"
+    repeat-string "^1.6.1"
+
 to-regex-range@^5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/to-regex-range/-/to-regex-range-5.0.1.tgz#1648c44aae7c8d988a326018ed72f5b4dd0392e4"
@@ -2729,11 +3456,33 @@
   dependencies:
     is-number "^7.0.0"
 
+to-regex@^3.0.1, to-regex@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/to-regex/-/to-regex-3.0.2.tgz#13cfdd9b336552f30b51f33a8ae1b42a7a7599ce"
+  integrity sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw==
+  dependencies:
+    define-property "^2.0.2"
+    extend-shallow "^3.0.2"
+    regex-not "^1.0.2"
+    safe-regex "^1.1.0"
+
 trim-newlines@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-3.0.1.tgz#260a5d962d8b752425b32f3a7db0dcacd176c144"
   integrity sha512-c1PTsA3tYrIsLGkJkzHF+w9F2EyxfXGo4UyJc4pFL++FMjnq0HJS69T3M7d//gKrFKwy429bouPescbjecU+Zw==
 
+ts-lit-plugin@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/ts-lit-plugin/-/ts-lit-plugin-1.2.1.tgz#7fca17a454645c14911917fa7f17ade582fa3056"
+  integrity sha512-k/Me+aT1N9ckC/KuJCAlAJgCHFezOxuOGOzBE0q42xnKbJnUMNl08WqWF6C7OKecCPHIMRk5Wj5o6MDsmt9+qA==
+  dependencies:
+    lit-analyzer "1.2.1"
+
+ts-simple-type@~1.0.5:
+  version "1.0.7"
+  resolved "https://registry.yarnpkg.com/ts-simple-type/-/ts-simple-type-1.0.7.tgz#03930af557528dd40eaa121913c7035a0baaacf8"
+  integrity sha512-zKmsCQs4dZaeSKjEA7pLFDv7FHHqAFLPd0Mr//OIJvu8M+4p4bgSFJwZSEBEg3ec9W7RzRz1vi8giiX0+mheBQ==
+
 tsconfig-paths@^3.11.0:
   version "3.11.0"
   resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.11.0.tgz#954c1fe973da6339c78e06b03ce2e48810b65f36"
@@ -2763,10 +3512,10 @@
   dependencies:
     tslib "^1.8.1"
 
-twinkie@^1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/twinkie/-/twinkie-1.1.2.tgz#c301e4fc26d00d61d3d7e5be030dc6a2264271da"
-  integrity sha512-4KwhyrcrRb0WWJKMX/aT+npmMZC0h+sA//+bLhNupmuKvesrH2vEZDe6yIr48FMWKEsdA2xNdQqw/3MapZ5qXQ==
+twinkie@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/twinkie/-/twinkie-1.1.3.tgz#1a6f0cd11c59e245bc2d16c7c9fc1ec13e477229"
+  integrity sha512-8Y1U/UCtf8JC4snuV4KAo4e9nwJcKZUoMVOApihJzua4JJWeGB/2RYqAusKk3cUczJeZRGzirHpP1hkArcbA8A==
   dependencies:
     "@types/minimatch" "3.0.3"
     cheerio "1.0.0-rc.2"
@@ -2812,16 +3561,16 @@
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@4.0.5:
-  version "4.0.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.5.tgz#ae9dddfd1069f1cb5beb3ef3b2170dd7c1332389"
-  integrity sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==
-
-typescript@4.3.2:
+typescript@4.0.5, typescript@4.3.2:
   version "4.3.2"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.2.tgz#399ab18aac45802d6f2498de5054fcbbe716a805"
   integrity sha512-zZ4hShnmnoVnAHpVHWpTcxdv7dWP60S2FsydQLV8V5PbS3FifjWFFRiHSWpDJahly88PRyV5teTSLoq4eG7mKw==
 
+typescript@^3.8.3:
+  version "3.9.10"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.10.tgz#70f3910ac7a51ed6bef79da7800690b19bf778b8"
+  integrity sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==
+
 unbox-primitive@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/unbox-primitive/-/unbox-primitive-1.0.1.tgz#085e215625ec3162574dc8859abee78a59b14471"
@@ -2832,6 +3581,16 @@
     has-symbols "^1.0.2"
     which-boxed-primitive "^1.0.2"
 
+union-value@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/union-value/-/union-value-1.0.1.tgz#0b6fe7b835aecda61c6ea4d4f02c14221e109847"
+  integrity sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==
+  dependencies:
+    arr-union "^3.1.0"
+    get-value "^2.0.6"
+    is-extendable "^0.1.1"
+    set-value "^2.0.1"
+
 unique-string@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/unique-string/-/unique-string-2.0.0.tgz#39c6451f81afb2749de2b233e3f7c5e8843bd89d"
@@ -2839,6 +3598,14 @@
   dependencies:
     crypto-random-string "^2.0.0"
 
+unset-value@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/unset-value/-/unset-value-1.0.0.tgz#8376873f7d2335179ffb1e6fc3a8ed0dfc8ab559"
+  integrity sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=
+  dependencies:
+    has-value "^0.3.1"
+    isobject "^3.0.0"
+
 update-notifier@^5.0.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/update-notifier/-/update-notifier-5.1.0.tgz#4ab0d7c7f36a231dd7316cf7729313f0214d9ad9"
@@ -2866,6 +3633,11 @@
   dependencies:
     punycode "^2.1.0"
 
+urix@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/urix/-/urix-0.1.0.tgz#da937f7a62e21fec1fd18d49b35c2935067a6c72"
+  integrity sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=
+
 url-parse-lax@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-3.0.0.tgz#16b5cafc07dbe3676c1b1999177823d6503acb0c"
@@ -2873,6 +3645,11 @@
   dependencies:
     prepend-http "^2.0.0"
 
+use@^3.1.0:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"
+  integrity sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==
+
 util-deprecate@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
@@ -2891,6 +3668,56 @@
     spdx-correct "^3.0.0"
     spdx-expression-parse "^3.0.0"
 
+vscode-css-languageservice@4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/vscode-css-languageservice/-/vscode-css-languageservice-4.3.0.tgz#40c797d664ab6188cace33cfbb19b037580a9318"
+  integrity sha512-BkQAMz4oVHjr0oOAz5PdeE72txlLQK7NIwzmclfr+b6fj6I8POwB+VoXvrZLTbWt9hWRgfvgiQRkh5JwrjPJ5A==
+  dependencies:
+    vscode-languageserver-textdocument "^1.0.1"
+    vscode-languageserver-types "3.16.0-next.2"
+    vscode-nls "^4.1.2"
+    vscode-uri "^2.1.2"
+
+vscode-html-languageservice@3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/vscode-html-languageservice/-/vscode-html-languageservice-3.1.0.tgz#265b53bda595e6947b16b0fb8c604e1e58685393"
+  integrity sha512-QAyRHI98bbEIBCqTzZVA0VblGU40na0txggongw5ZgTj9UVsVk5XbLT16O9OTcbqBGSqn0oWmFDNjK/XGIDcqg==
+  dependencies:
+    vscode-languageserver-textdocument "^1.0.1"
+    vscode-languageserver-types "3.16.0-next.2"
+    vscode-nls "^4.1.2"
+    vscode-uri "^2.1.2"
+
+vscode-languageserver-textdocument@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/vscode-languageserver-textdocument/-/vscode-languageserver-textdocument-1.0.1.tgz#178168e87efad6171b372add1dea34f53e5d330f"
+  integrity sha512-UIcJDjX7IFkck7cSkNNyzIz5FyvpQfY7sdzVy+wkKN/BLaD4DQ0ppXQrKePomCxTS7RrolK1I0pey0bG9eh8dA==
+
+vscode-languageserver-types@3.16.0-next.2:
+  version "3.16.0-next.2"
+  resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.16.0-next.2.tgz#940bd15c992295a65eae8ab6b8568a1e8daa3083"
+  integrity sha512-QjXB7CKIfFzKbiCJC4OWC8xUncLsxo19FzGVp/ADFvvi87PlmBSCAtZI5xwGjF5qE0xkLf0jjKUn3DzmpDP52Q==
+
+vscode-nls@^4.1.2:
+  version "4.1.2"
+  resolved "https://registry.yarnpkg.com/vscode-nls/-/vscode-nls-4.1.2.tgz#ca8bf8bb82a0987b32801f9fddfdd2fb9fd3c167"
+  integrity sha512-7bOHxPsfyuCqmP+hZXscLhiHwe7CSuFE4hyhbs22xPIhQ4jv99FcR4eBzfYYVLP356HNFpdvz63FFb/xw6T4Iw==
+
+vscode-uri@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/vscode-uri/-/vscode-uri-2.1.2.tgz#c8d40de93eb57af31f3c715dd650e2ca2c096f1c"
+  integrity sha512-8TEXQxlldWAuIODdukIb+TR5s+9Ds40eSJrw+1iDDA9IFORPjMELarNQE3myz5XIkWWpdprmJjm1/SxMlWOC8A==
+
+web-component-analyzer@~1.1.1:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/web-component-analyzer/-/web-component-analyzer-1.1.6.tgz#d9bd904d904a711c19ba6046a45b60a7ee3ed2e9"
+  integrity sha512-1PyBkb/jijDEVE+Pnk3DTmVHD8takipdvAwvZv1V8jIidsSIJ5nhN87Gs+4dpEb1vw48yp8dnbZKkvMYJ+C0VQ==
+  dependencies:
+    fast-glob "^3.2.2"
+    ts-simple-type "~1.0.5"
+    typescript "^3.8.3"
+    yargs "^15.3.1"
+
 which-boxed-primitive@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz#13757bc89b209b049fe5d86430e21cf40a89a8e6"
@@ -2902,6 +3729,11 @@
     is-string "^1.0.5"
     is-symbol "^1.0.3"
 
+which-module@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
+  integrity sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=
+
 which@^2.0.1:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/which/-/which-2.0.2.tgz#7c6a8dd0a636a0327e10b59c9286eee93f3f51b1"
@@ -2921,6 +3753,15 @@
   resolved "https://registry.yarnpkg.com/word-wrap/-/word-wrap-1.2.3.tgz#610636f6b1f703891bd34771ccb17fb93b47079c"
   integrity sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==
 
+wrap-ansi@^6.2.0:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-6.2.0.tgz#e9393ba07102e6c91a3b221478f0257cd2856e53"
+  integrity sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==
+  dependencies:
+    ansi-styles "^4.0.0"
+    string-width "^4.1.0"
+    strip-ansi "^6.0.0"
+
 wrap-ansi@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-7.0.0.tgz#67e145cff510a6a6984bdf1152911d69d2eb9e43"
@@ -2950,12 +3791,42 @@
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-4.0.0.tgz#4bc8d9984403696225ef83a1573cbbcb4e79db13"
   integrity sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==
 
+y18n@^4.0.0:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.3.tgz#b5f259c82cd6e336921efd7bfd8bf560de9eeedf"
+  integrity sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==
+
 yallist@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-4.0.0.tgz#9bb92790d9c0effec63be73519e11a35019a3a72"
   integrity sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==
 
+yargs-parser@^18.1.2:
+  version "18.1.3"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-18.1.3.tgz#be68c4975c6b2abf469236b0c870362fab09a7b0"
+  integrity sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==
+  dependencies:
+    camelcase "^5.0.0"
+    decamelize "^1.2.0"
+
 yargs-parser@^20.2.3:
   version "20.2.9"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-20.2.9.tgz#2eb7dc3b0289718fc295f362753845c41a0c94ee"
   integrity sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w==
+
+yargs@^15.3.1:
+  version "15.4.1"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-15.4.1.tgz#0d87a16de01aee9d8bec2bfbf74f67851730f4f8"
+  integrity sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==
+  dependencies:
+    cliui "^6.0.0"
+    decamelize "^1.2.0"
+    find-up "^4.1.0"
+    get-caller-file "^2.0.1"
+    require-directory "^2.1.1"
+    require-main-filename "^2.0.0"
+    set-blocking "^2.0.0"
+    string-width "^4.2.0"
+    which-module "^2.0.0"
+    y18n "^4.0.0"
+    yargs-parser "^18.1.2"