Merge "Add 'parentof' operator that matches parent changes for a change"
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 91fe24b..23720460 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -5189,6 +5189,13 @@
 +
 By default 50.
 
+[[suggest.skipServiceUsers]]suggest.skipServiceUsers::
++
+If link:access-control.html#service_users[service users] should be skipped when
+suggesting reviewers.
++
+By default true.
+
 [[tracing]]
 === Section tracing
 
diff --git a/Documentation/rest-api-config.txt b/Documentation/rest-api-config.txt
index 9764c8a..a8d9b3d 100644
--- a/Documentation/rest-api-config.txt
+++ b/Documentation/rest-api-config.txt
@@ -1839,6 +1839,8 @@
 Whether to enable the web UI for editing GPG keys.
 |`report_bug_url`    |optional|
 link:config-gerrit.html#gerrit.reportBugUrl[URL to report bugs].
+|`instance_id`       |optional|
+link:config-gerrit.html#gerrit.instanceId[Short identifier for this Gerrit installation].
 |=================================
 
 [[index-config-info]]
diff --git a/WORKSPACE b/WORKSPACE
index ccbc63d..c24d4f9 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -842,55 +842,55 @@
     sha1 = "7e060dd5b19431e6d198e91ff670644372f60fbd",
 )
 
-JETTY_VERS = "9.4.35.v20201120"
+JETTY_VERS = "9.4.36.v20210114"
 
 maven_jar(
     name = "jetty-servlet",
     artifact = "org.eclipse.jetty:jetty-servlet:" + JETTY_VERS,
-    sha1 = "3e61bcb471e1bfc545ce866cbbe33c3aedeec9b1",
+    sha1 = "b189e52a5ee55ae172e4e99e29c5c314f5daf4b9",
 )
 
 maven_jar(
     name = "jetty-security",
     artifact = "org.eclipse.jetty:jetty-security:" + JETTY_VERS,
-    sha1 = "80dc2f422789c78315de76d289b7a5b36c3232d5",
+    sha1 = "42030d6ed7dfc0f75818cde0adcf738efc477574",
 )
 
 maven_jar(
     name = "jetty-server",
     artifact = "org.eclipse.jetty:jetty-server:" + JETTY_VERS,
-    sha1 = "513502352fd689d4730b2935421b990ada8cc818",
+    sha1 = "88a7d342974aadca658e7386e8d0fcc5c0788f41",
 )
 
 maven_jar(
     name = "jetty-jmx",
     artifact = "org.eclipse.jetty:jetty-jmx:" + JETTY_VERS,
-    sha1 = "38812031940a466d626ab5d9bbbd9d5d39e9f735",
+    sha1 = "bb3847eabe085832aeaedd30e872b40931632e54",
 )
 
 maven_jar(
     name = "jetty-http",
     artifact = "org.eclipse.jetty:jetty-http:" + JETTY_VERS,
-    sha1 = "45d35131a35a1e76991682174421e8cdf765fb9f",
+    sha1 = "1eee89a55e04ff94df0f85d95200fc48acb43d86",
 )
 
 maven_jar(
     name = "jetty-io",
     artifact = "org.eclipse.jetty:jetty-io:" + JETTY_VERS,
-    sha1 = "eb9460700b99b71ecd82a53697f5ff99f69b9e1c",
+    sha1 = "84a8faf9031eb45a5a2ddb7681e22c483d81ab3a",
 )
 
 maven_jar(
     name = "jetty-util",
     artifact = "org.eclipse.jetty:jetty-util:" + JETTY_VERS,
-    sha1 = "ef61b83f9715c3b5355b633d9f01d2834f908ece",
+    sha1 = "925257fbcca6b501a25252c7447dbedb021f7404",
 )
 
 maven_jar(
     name = "jetty-util-ajax",
     artifact = "org.eclipse.jetty:jetty-util-ajax:" + JETTY_VERS,
-    sha1 = "ebbb43912c6423bedb3458e44aee28eeb4d66f27",
-    src_sha1 = "b3acea974a17493afb125a9dfbe783870ce1d2f9",
+    sha1 = "2f478130c21787073facb64d7242e06f94980c60",
+    src_sha1 = "7153d7ca38878d971fd90992c303bb7719ba7a21",
 )
 
 maven_jar(
diff --git a/java/com/google/gerrit/extensions/common/ActionInfo.java b/java/com/google/gerrit/extensions/common/ActionInfo.java
index 6ab80b2..2144ed5 100644
--- a/java/com/google/gerrit/extensions/common/ActionInfo.java
+++ b/java/com/google/gerrit/extensions/common/ActionInfo.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.extensions.common;
 
 import com.google.gerrit.extensions.webui.UiAction;
+import java.util.Objects;
 
 /**
  * Representation of an action in the REST API.
@@ -55,4 +56,23 @@
     title = d.getTitle();
     enabled = d.isEnabled() ? true : null;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof ActionInfo) {
+      ActionInfo actionInfo = (ActionInfo) o;
+      return Objects.equals(method, actionInfo.method)
+          && Objects.equals(label, actionInfo.label)
+          && Objects.equals(title, actionInfo.title)
+          && Objects.equals(enabled, actionInfo.enabled);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(method, label, title, enabled);
+  }
+
+  protected ActionInfo() {}
 }
diff --git a/java/com/google/gerrit/extensions/common/ApprovalInfo.java b/java/com/google/gerrit/extensions/common/ApprovalInfo.java
index f95ddff..bf72e83 100644
--- a/java/com/google/gerrit/extensions/common/ApprovalInfo.java
+++ b/java/com/google/gerrit/extensions/common/ApprovalInfo.java
@@ -16,6 +16,7 @@
 
 import com.google.gerrit.common.Nullable;
 import java.sql.Timestamp;
+import java.util.Objects;
 
 /**
  * Representation of an approval in the REST API.
@@ -71,4 +72,23 @@
     this.date = date;
     this.tag = tag;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof ApprovalInfo) {
+      ApprovalInfo approvalInfo = (ApprovalInfo) o;
+      return super.equals(o)
+          && Objects.equals(tag, approvalInfo.tag)
+          && Objects.equals(value, approvalInfo.value)
+          && Objects.equals(date, approvalInfo.date)
+          && Objects.equals(postSubmit, approvalInfo.postSubmit)
+          && Objects.equals(permittedVotingRange, approvalInfo.permittedVotingRange);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(super.hashCode(), tag, value, date, postSubmit, permittedVotingRange);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/AttentionSetInfo.java b/java/com/google/gerrit/extensions/common/AttentionSetInfo.java
index f29d32b..ba865fb 100644
--- a/java/com/google/gerrit/extensions/common/AttentionSetInfo.java
+++ b/java/com/google/gerrit/extensions/common/AttentionSetInfo.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.extensions.common;
 
 import java.sql.Timestamp;
+import java.util.Objects;
 
 /**
  * Represents a single user included in the attention set. Used in the API. See {@link
@@ -36,4 +37,22 @@
     this.lastUpdate = lastUpdate;
     this.reason = reason;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof AttentionSetInfo) {
+      AttentionSetInfo attentionSetInfo = (AttentionSetInfo) o;
+      return Objects.equals(account, attentionSetInfo.account)
+          && Objects.equals(lastUpdate, attentionSetInfo.lastUpdate)
+          && Objects.equals(reason, attentionSetInfo.reason);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(account, lastUpdate, reason);
+  }
+
+  protected AttentionSetInfo() {}
 }
diff --git a/java/com/google/gerrit/extensions/common/AvatarInfo.java b/java/com/google/gerrit/extensions/common/AvatarInfo.java
index 75665a8..b620ac2 100644
--- a/java/com/google/gerrit/extensions/common/AvatarInfo.java
+++ b/java/com/google/gerrit/extensions/common/AvatarInfo.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.extensions.common;
 
+import java.util.Objects;
+
 /**
  * Representation of an avatar in the REST API.
  *
@@ -38,4 +40,20 @@
 
   /** The width of the avatar image in pixels. */
   public Integer width;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof AvatarInfo) {
+      AvatarInfo avatarInfo = (AvatarInfo) o;
+      return Objects.equals(url, avatarInfo.url)
+          && Objects.equals(height, avatarInfo.height)
+          && Objects.equals(width, avatarInfo.width);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(url, height, width);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/FetchInfo.java b/java/com/google/gerrit/extensions/common/FetchInfo.java
index eda84b1..4b1e941 100644
--- a/java/com/google/gerrit/extensions/common/FetchInfo.java
+++ b/java/com/google/gerrit/extensions/common/FetchInfo.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.extensions.common;
 
 import java.util.Map;
+import java.util.Objects;
 
 public class FetchInfo {
   public String url;
@@ -25,4 +26,22 @@
     this.url = url;
     this.ref = ref;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof FetchInfo) {
+      FetchInfo fetchInfo = (FetchInfo) o;
+      return Objects.equals(url, fetchInfo.url)
+          && Objects.equals(ref, fetchInfo.ref)
+          && Objects.equals(commands, fetchInfo.commands);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(url, ref, commands);
+  }
+
+  protected FetchInfo() {}
 }
diff --git a/java/com/google/gerrit/extensions/common/GerritInfo.java b/java/com/google/gerrit/extensions/common/GerritInfo.java
index 2ae6703..3265a00 100644
--- a/java/com/google/gerrit/extensions/common/GerritInfo.java
+++ b/java/com/google/gerrit/extensions/common/GerritInfo.java
@@ -23,4 +23,5 @@
   public Boolean editGpgKeys;
   public String reportBugUrl;
   public String primaryWeblinkName;
+  public String instanceId;
 }
diff --git a/java/com/google/gerrit/extensions/common/GpgKeyInfo.java b/java/com/google/gerrit/extensions/common/GpgKeyInfo.java
index 7a5c15b..d656f22 100644
--- a/java/com/google/gerrit/extensions/common/GpgKeyInfo.java
+++ b/java/com/google/gerrit/extensions/common/GpgKeyInfo.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.extensions.common;
 
 import java.util.List;
+import java.util.Objects;
 
 public class GpgKeyInfo {
   /**
@@ -43,4 +44,22 @@
 
   public Status status;
   public List<String> problems;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof GpgKeyInfo) {
+      GpgKeyInfo gpgKeyInfo = (GpgKeyInfo) o;
+      return Objects.equals(id, gpgKeyInfo.id)
+          && Objects.equals(fingerprint, gpgKeyInfo.fingerprint)
+          && Objects.equals(userIds, gpgKeyInfo.userIds)
+          && Objects.equals(status, gpgKeyInfo.status)
+          && Objects.equals(problems, gpgKeyInfo.problems);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, fingerprint, userIds, status, problems);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/LabelInfo.java b/java/com/google/gerrit/extensions/common/LabelInfo.java
index 76dd93d..44bcdaf 100644
--- a/java/com/google/gerrit/extensions/common/LabelInfo.java
+++ b/java/com/google/gerrit/extensions/common/LabelInfo.java
@@ -16,6 +16,7 @@
 
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 public class LabelInfo {
   public AccountInfo approved;
@@ -30,4 +31,37 @@
   public Short defaultValue;
   public Boolean optional;
   public Boolean blocking;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof LabelInfo) {
+      LabelInfo labelInfo = (LabelInfo) o;
+      return Objects.equals(approved, labelInfo.approved)
+          && Objects.equals(rejected, labelInfo.rejected)
+          && Objects.equals(recommended, labelInfo.recommended)
+          && Objects.equals(disliked, labelInfo.disliked)
+          && Objects.equals(all, labelInfo.all)
+          && Objects.equals(values, labelInfo.values)
+          && Objects.equals(value, labelInfo.value)
+          && Objects.equals(defaultValue, labelInfo.defaultValue)
+          && Objects.equals(optional, labelInfo.optional)
+          && Objects.equals(blocking, labelInfo.blocking);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(
+        approved,
+        rejected,
+        recommended,
+        disliked,
+        all,
+        values,
+        value,
+        defaultValue,
+        optional,
+        blocking);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/PluginDefinedInfo.java b/java/com/google/gerrit/extensions/common/PluginDefinedInfo.java
index 69bfa2c..e2b1c36 100644
--- a/java/com/google/gerrit/extensions/common/PluginDefinedInfo.java
+++ b/java/com/google/gerrit/extensions/common/PluginDefinedInfo.java
@@ -14,7 +14,24 @@
 
 package com.google.gerrit.extensions.common;
 
+import java.util.Objects;
+
 public class PluginDefinedInfo {
   public String name;
   public String message;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof PluginDefinedInfo) {
+      PluginDefinedInfo pluginDefinedInfo = (PluginDefinedInfo) o;
+      return Objects.equals(name, pluginDefinedInfo.name)
+          && Objects.equals(message, pluginDefinedInfo.message);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(name, message);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/PushCertificateInfo.java b/java/com/google/gerrit/extensions/common/PushCertificateInfo.java
index 9eed808..199dbd1 100644
--- a/java/com/google/gerrit/extensions/common/PushCertificateInfo.java
+++ b/java/com/google/gerrit/extensions/common/PushCertificateInfo.java
@@ -14,7 +14,24 @@
 
 package com.google.gerrit.extensions.common;
 
+import java.util.Objects;
+
 public class PushCertificateInfo {
   public String certificate;
   public GpgKeyInfo key;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof PushCertificateInfo) {
+      PushCertificateInfo pushCertificateInfo = (PushCertificateInfo) o;
+      return Objects.equals(certificate, pushCertificateInfo.certificate)
+          && Objects.equals(key, pushCertificateInfo.key);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(certificate, key);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/ReviewerUpdateInfo.java b/java/com/google/gerrit/extensions/common/ReviewerUpdateInfo.java
index eccdc64..37e1ceb 100644
--- a/java/com/google/gerrit/extensions/common/ReviewerUpdateInfo.java
+++ b/java/com/google/gerrit/extensions/common/ReviewerUpdateInfo.java
@@ -16,10 +16,28 @@
 
 import com.google.gerrit.extensions.client.ReviewerState;
 import java.sql.Timestamp;
+import java.util.Objects;
 
 public class ReviewerUpdateInfo {
   public Timestamp updated;
   public AccountInfo updatedBy;
   public AccountInfo reviewer;
   public ReviewerState state;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof ReviewerUpdateInfo) {
+      ReviewerUpdateInfo reviewerUpdateInfo = (ReviewerUpdateInfo) o;
+      return Objects.equals(updated, reviewerUpdateInfo.updated)
+          && Objects.equals(updatedBy, reviewerUpdateInfo.updatedBy)
+          && Objects.equals(reviewer, reviewerUpdateInfo.reviewer)
+          && Objects.equals(state, reviewerUpdateInfo.state);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(updated, updatedBy, reviewer, state);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/RevisionInfo.java b/java/com/google/gerrit/extensions/common/RevisionInfo.java
index f262901..ea61f31 100644
--- a/java/com/google/gerrit/extensions/common/RevisionInfo.java
+++ b/java/com/google/gerrit/extensions/common/RevisionInfo.java
@@ -17,6 +17,7 @@
 import com.google.gerrit.extensions.client.ChangeKind;
 import java.sql.Timestamp;
 import java.util.Map;
+import java.util.Objects;
 
 public class RevisionInfo {
   // ActionJson#copy(List, RevisionInfo) must be adapted if new fields are added that are not
@@ -34,4 +35,43 @@
   public String commitWithFooters;
   public PushCertificateInfo pushCertificate;
   public String description;
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof RevisionInfo) {
+      RevisionInfo revisionInfo = (RevisionInfo) o;
+      return isCurrent == revisionInfo.isCurrent
+          && Objects.equals(kind, revisionInfo.kind)
+          && _number == revisionInfo._number
+          && Objects.equals(created, revisionInfo.created)
+          && Objects.equals(uploader, revisionInfo.uploader)
+          && Objects.equals(ref, revisionInfo.ref)
+          && Objects.equals(fetch, revisionInfo.fetch)
+          && Objects.equals(commit, revisionInfo.commit)
+          && Objects.equals(files, revisionInfo.files)
+          && Objects.equals(actions, revisionInfo.actions)
+          && Objects.equals(commitWithFooters, revisionInfo.commitWithFooters)
+          && Objects.equals(pushCertificate, revisionInfo.pushCertificate)
+          && Objects.equals(description, revisionInfo.description);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(
+        isCurrent,
+        kind,
+        _number,
+        created,
+        uploader,
+        ref,
+        fetch,
+        commit,
+        files,
+        actions,
+        commitWithFooters,
+        pushCertificate,
+        description);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/SubmitRequirementInfo.java b/java/com/google/gerrit/extensions/common/SubmitRequirementInfo.java
index 3483de5..a13e645 100644
--- a/java/com/google/gerrit/extensions/common/SubmitRequirementInfo.java
+++ b/java/com/google/gerrit/extensions/common/SubmitRequirementInfo.java
@@ -18,9 +18,9 @@
 import java.util.Objects;
 
 public class SubmitRequirementInfo {
-  public final String status;
-  public final String fallbackText;
-  public final String type;
+  public String status;
+  public String fallbackText;
+  public String type;
 
   public SubmitRequirementInfo(String status, String fallbackText, String type) {
     this.status = status;
@@ -55,4 +55,6 @@
         .add("type", type)
         .toString();
   }
+
+  protected SubmitRequirementInfo() {}
 }
diff --git a/java/com/google/gerrit/extensions/common/TrackingIdInfo.java b/java/com/google/gerrit/extensions/common/TrackingIdInfo.java
index 0c5ed68..3d35e08 100644
--- a/java/com/google/gerrit/extensions/common/TrackingIdInfo.java
+++ b/java/com/google/gerrit/extensions/common/TrackingIdInfo.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.extensions.common;
 
+import java.util.Objects;
+
 public class TrackingIdInfo {
   public String system;
   public String id;
@@ -22,4 +24,20 @@
     this.system = system;
     this.id = id;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof TrackingIdInfo) {
+      TrackingIdInfo trackingIdInfo = (TrackingIdInfo) o;
+      return Objects.equals(system, trackingIdInfo.system) && Objects.equals(id, trackingIdInfo.id);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(system, id);
+  }
+
+  protected TrackingIdInfo() {}
 }
diff --git a/java/com/google/gerrit/extensions/common/VotingRangeInfo.java b/java/com/google/gerrit/extensions/common/VotingRangeInfo.java
index 5c35a49..2f7e9e4 100644
--- a/java/com/google/gerrit/extensions/common/VotingRangeInfo.java
+++ b/java/com/google/gerrit/extensions/common/VotingRangeInfo.java
@@ -14,6 +14,8 @@
 
 package com.google.gerrit.extensions.common;
 
+import java.util.Objects;
+
 public class VotingRangeInfo {
   public int min;
   public int max;
@@ -22,4 +24,18 @@
     this.min = min;
     this.max = max;
   }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o instanceof VotingRangeInfo) {
+      VotingRangeInfo votingRangeInfo = (VotingRangeInfo) o;
+      return min == votingRangeInfo.min && max == votingRangeInfo.max;
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(min, max);
+  }
 }
diff --git a/java/com/google/gerrit/extensions/common/WebLinkInfo.java b/java/com/google/gerrit/extensions/common/WebLinkInfo.java
index 84fd970..ba12be0 100644
--- a/java/com/google/gerrit/extensions/common/WebLinkInfo.java
+++ b/java/com/google/gerrit/extensions/common/WebLinkInfo.java
@@ -64,4 +64,6 @@
         + target
         + "}";
   }
+
+  protected WebLinkInfo() {}
 }
diff --git a/java/com/google/gerrit/server/patch/AutoMerger.java b/java/com/google/gerrit/server/patch/AutoMerger.java
index fe915c5..ac37411 100644
--- a/java/com/google/gerrit/server/patch/AutoMerger.java
+++ b/java/com/google/gerrit/server/patch/AutoMerger.java
@@ -109,6 +109,7 @@
               ActionType.GIT_UPDATE,
               "createAutoMerge",
               () -> createAutoMergeCommit(repo, rw, ins, merge, mergeStrategy))
+          .defaultTimeoutMultiplier(2)
           .call();
     } catch (Exception e) {
       Throwables.throwIfUnchecked(e);
diff --git a/java/com/google/gerrit/server/query/change/ChangeData.java b/java/com/google/gerrit/server/query/change/ChangeData.java
index 05ecc61..f047543 100644
--- a/java/com/google/gerrit/server/query/change/ChangeData.java
+++ b/java/com/google/gerrit/server/query/change/ChangeData.java
@@ -109,6 +109,13 @@
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 
+/**
+ * ChangeData provides lazily loaded interface to change metadata loaded from NoteDb. It can be
+ * constructed by loading from NoteDb, or calling setters. The latter happens when ChangeData is
+ * retrieved through the change index. This happens for Applications that are performance sensitive
+ * (eg. dashboard loads, git protocol negotiation) but can tolerate staleness. In that case, setting
+ * lazyLoad=false disables loading from NoteDb, so we don't accidentally enable a slow path.
+ */
 public class ChangeData {
   public static List<Change> asChanges(List<ChangeData> changeDatas) {
     List<Change> result = new ArrayList<>(changeDatas.size());
@@ -600,6 +607,7 @@
       author = c.getAuthorIdent();
       committer = c.getCommitterIdent();
       parentCount = c.getParentCount();
+      merge = parentCount > 0;
     } catch (IOException e) {
       throw new StorageException(
           String.format(
@@ -961,7 +969,7 @@
         return null;
       }
     }
-    return parentCount > 1;
+    return merge;
   }
 
   public Set<Account.Id> editsByUser() {
diff --git a/java/com/google/gerrit/server/restapi/change/PostReview.java b/java/com/google/gerrit/server/restapi/change/PostReview.java
index 562bdf8..73b38b2 100644
--- a/java/com/google/gerrit/server/restapi/change/PostReview.java
+++ b/java/com/google/gerrit/server/restapi/change/PostReview.java
@@ -1228,9 +1228,10 @@
     }
 
     private boolean isReviewer(ChangeContext ctx) {
-      ChangeData cd = changeDataFactory.create(ctx.getNotes());
-      ReviewerSet reviewers = cd.reviewers();
-      return reviewers.byState(REVIEWER).contains(ctx.getAccountId());
+      return approvalsUtil
+          .getReviewers(ctx.getNotes())
+          .byState(REVIEWER)
+          .contains(ctx.getAccountId());
     }
 
     private boolean updateLabels(ProjectState projectState, ChangeContext ctx)
diff --git a/java/com/google/gerrit/server/restapi/change/ReviewersUtil.java b/java/com/google/gerrit/server/restapi/change/ReviewersUtil.java
index 2a55e41..38be27e 100644
--- a/java/com/google/gerrit/server/restapi/change/ReviewersUtil.java
+++ b/java/com/google/gerrit/server/restapi/change/ReviewersUtil.java
@@ -51,6 +51,7 @@
 import com.google.gerrit.server.account.AccountState;
 import com.google.gerrit.server.account.GroupBackend;
 import com.google.gerrit.server.account.GroupMembers;
+import com.google.gerrit.server.account.ServiceUserClassifier;
 import com.google.gerrit.server.change.ReviewerAdder;
 import com.google.gerrit.server.index.account.AccountField;
 import com.google.gerrit.server.index.account.AccountIndexCollection;
@@ -130,6 +131,7 @@
   private final IndexConfig indexConfig;
   private final AccountControl.Factory accountControlFactory;
   private final Provider<CurrentUser> self;
+  private final ServiceUserClassifier serviceUserClassifier;
 
   @Inject
   ReviewersUtil(
@@ -143,7 +145,8 @@
       AccountIndexCollection accountIndexes,
       IndexConfig indexConfig,
       AccountControl.Factory accountControlFactory,
-      Provider<CurrentUser> self) {
+      Provider<CurrentUser> self,
+      ServiceUserClassifier serviceUserClassifier) {
     this.accountLoaderFactory = accountLoaderFactory;
     this.accountQueryBuilder = accountQueryBuilder;
     this.accountIndexRewriter = accountIndexRewriter;
@@ -155,6 +158,7 @@
     this.indexConfig = indexConfig;
     this.accountControlFactory = accountControlFactory;
     this.self = self;
+    this.serviceUserClassifier = serviceUserClassifier;
   }
 
   public interface VisibilityControl {
@@ -200,13 +204,17 @@
             reviewerState, changeNotes, suggestReviewers, projectState, candidateList);
     logger.atFine().log("Sorted recommendations: %s", sortedRecommendations);
 
-    // Filter accounts by visibility and enforce limit
+    // Filter accounts by visibility, skip service users and enforce limit
     List<Account.Id> filteredRecommendations = new ArrayList<>();
     try (Timer0.Context ctx = metrics.filterVisibility.start()) {
       for (Account.Id reviewer : sortedRecommendations) {
         if (filteredRecommendations.size() >= limit) {
           break;
         }
+        if (suggestReviewers.isSkipServiceUsers()
+            && serviceUserClassifier.isServiceUser(reviewer)) {
+          continue;
+        }
         // Check if change is visible to reviewer and if the current user can see reviewer
         if (visibilityControl.isVisibleTo(reviewer)
             && accountControlFactory.get().canSee(reviewer)) {
diff --git a/java/com/google/gerrit/server/restapi/change/SuggestReviewers.java b/java/com/google/gerrit/server/restapi/change/SuggestReviewers.java
index e071c89..71ff493 100644
--- a/java/com/google/gerrit/server/restapi/change/SuggestReviewers.java
+++ b/java/com/google/gerrit/server/restapi/change/SuggestReviewers.java
@@ -31,6 +31,8 @@
 
   private static final int DEFAULT_MAX_SUGGESTED = 10;
 
+  private static final boolean DEFAULT_SKIP_SERVICE_USERS = true;
+
   protected final ReviewersUtil reviewersUtil;
 
   private final boolean suggestAccounts;
@@ -39,6 +41,7 @@
   protected int limit;
   protected String query;
   protected final int maxSuggestedReviewers;
+  protected boolean skipServiceUsers;
 
   @Option(
       name = "--limit",
@@ -78,6 +81,10 @@
     return maxAllowedWithoutConfirmation;
   }
 
+  public boolean isSkipServiceUsers() {
+    return skipServiceUsers;
+  }
+
   @Inject
   public SuggestReviewers(
       AccountVisibility av, @GerritServerConfig Config cfg, ReviewersUtil reviewersUtil) {
@@ -100,6 +107,9 @@
             ReviewerAdder.DEFAULT_MAX_REVIEWERS_WITHOUT_CHECK);
 
     logger.atFine().log("AccountVisibility: %s", av.name());
+
+    this.skipServiceUsers =
+        cfg.getBoolean("suggest", "skipServiceUsers", DEFAULT_SKIP_SERVICE_USERS);
   }
 
   public static GerritConfigListener configListener() {
diff --git a/java/com/google/gerrit/server/restapi/config/GetServerInfo.java b/java/com/google/gerrit/server/restapi/config/GetServerInfo.java
index 5459ede..0a5692e 100644
--- a/java/com/google/gerrit/server/restapi/config/GetServerInfo.java
+++ b/java/com/google/gerrit/server/restapi/config/GetServerInfo.java
@@ -304,6 +304,7 @@
     info.editGpgKeys =
         toBoolean(enableSignedPush && config.getBoolean("gerrit", null, "editGpgKeys", true));
     info.primaryWeblinkName = config.getString("gerrit", null, "primaryWeblinkName");
+    info.instanceId = config.getString("gerrit", null, "instanceId");
     return info;
   }
 
diff --git a/java/com/google/gerrit/server/submit/MergeOp.java b/java/com/google/gerrit/server/submit/MergeOp.java
index 871d8d2..4e732a4 100644
--- a/java/com/google/gerrit/server/submit/MergeOp.java
+++ b/java/com/google/gerrit/server/submit/MergeOp.java
@@ -549,8 +549,8 @@
             .listener(retryTracker)
             // Up to the entire submit operation is retried, including possibly many projects.
             // Multiply the timeout by the number of projects we're actually attempting to
-            // submit.
-            .defaultTimeoutMultiplier(filteredNoteDbChangeSet.projects().size())
+            // submit. Times 2 to retry more persistently, to increase success rate.
+            .defaultTimeoutMultiplier(filteredNoteDbChangeSet.projects().size() * 2)
             // By default, we only retry lock failures. Here it's better to also retry unexpected
             // runtime exceptions.
             .retryOn(t -> t instanceof RuntimeException)
diff --git a/javatests/com/google/gerrit/acceptance/rest/change/SuggestReviewersIT.java b/javatests/com/google/gerrit/acceptance/rest/change/SuggestReviewersIT.java
index 888878f..ffde622 100644
--- a/javatests/com/google/gerrit/acceptance/rest/change/SuggestReviewersIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/change/SuggestReviewersIT.java
@@ -450,6 +450,23 @@
   }
 
   @Test
+  public void suggestNoServiceAccounts() throws Exception {
+    requestScopeOperations.setApiUser(user.id());
+    String changeIdReviewed = createChangeFromApi();
+    String changeId = createChangeFromApi();
+
+    String name = name("foo");
+    TestAccount foo = accountCreator.create(name);
+    reviewChange(changeIdReviewed, foo);
+
+    assertReviewers(suggestReviewers(changeId, name), ImmutableList.of(foo), ImmutableList.of());
+
+    groupOperations.group(serviceUsersUUID()).forUpdate().addMember(foo.id()).update();
+
+    assertReviewers(suggestReviewers(changeId, name), ImmutableList.of(), ImmutableList.of());
+  }
+
+  @Test
   public void suggestNoExistingReviewers() throws Exception {
     requestScopeOperations.setApiUser(user.id());
     String changeId = createChangeFromApi();
@@ -608,6 +625,13 @@
     return user(name, fullName, name);
   }
 
+  private AccountGroup.UUID serviceUsersUUID() {
+    return groupCache
+        .get(AccountGroup.nameKey("Service Users"))
+        .orElseThrow(() -> new IllegalStateException("unable to find 'Service Users'"))
+        .getGroupUUID();
+  }
+
   private void reviewChange(String changeId, TestAccount reviewer) throws RestApiException {
     gApi.changes().id(changeId).addReviewer(reviewer.id().toString());
   }
diff --git a/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java b/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java
index 0a84db4..4738f64 100644
--- a/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java
@@ -74,6 +74,7 @@
   @GerritConfig(name = "gerrit.allProjects", value = "Root")
   @GerritConfig(name = "gerrit.allUsers", value = "Users")
   @GerritConfig(name = "gerrit.reportBugUrl", value = "https://example.com/report")
+  @GerritConfig(name = "gerrit.instanceId", value = "devops-instance")
 
   // suggest
   @GerritConfig(name = "suggest.from", value = "3")
@@ -116,6 +117,7 @@
     assertThat(i.gerrit.allProjects).isEqualTo("Root");
     assertThat(i.gerrit.allUsers).isEqualTo("Users");
     assertThat(i.gerrit.reportBugUrl).isEqualTo("https://example.com/report");
+    assertThat(i.gerrit.instanceId).isEqualTo("devops-instance");
 
     // plugin
     assertThat(i.plugin.jsResourcePaths).isEmpty();
@@ -184,6 +186,7 @@
     assertThat(i.gerrit.allProjects).isEqualTo(AllProjectsNameProvider.DEFAULT);
     assertThat(i.gerrit.allUsers).isEqualTo(AllUsersNameProvider.DEFAULT);
     assertThat(i.gerrit.reportBugUrl).isNull();
+    assertThat(i.gerrit.instanceId).isNull();
 
     // plugin
     assertThat(i.plugin.jsResourcePaths).isEmpty();
diff --git a/modules/jgit b/modules/jgit
index 4560bdf..9bfb0f3 160000
--- a/modules/jgit
+++ b/modules/jgit
@@ -1 +1 @@
-Subproject commit 4560bdf7e2e3c16a7c7bb3f2fcf067bb1eee26fb
+Subproject commit 9bfb0f3a4ec856dcbebb477a1ee8803a3c47c194
diff --git a/polygerrit-ui/app/api/checks.ts b/polygerrit-ui/app/api/checks.ts
index 143fbd1..799d1f7 100644
--- a/polygerrit-ui/app/api/checks.ts
+++ b/polygerrit-ui/app/api/checks.ts
@@ -43,6 +43,12 @@
   fetchPollingIntervalSeconds: number;
 }
 
+export interface ChangeData {
+  changeNumber: number;
+  patchsetNumber: number;
+  repo: string;
+}
+
 export interface ChecksProvider {
   /**
    * Gerrit calls this method when ...
@@ -51,7 +57,7 @@
    * - ... while the tab is visible in a regular polling interval, see
    *       ChecksApiConfig.
    */
-  fetch(change: number, patchset: number): Promise<FetchResponse>;
+  fetch(change: ChangeData): Promise<FetchResponse>;
 }
 
 export interface FetchResponse {
@@ -224,10 +230,21 @@
 export type ActionCallback = (
   change: number,
   patchset: number,
+  /**
+   * Identical to 'attempt' property of CheckRun. Not set for top-level
+   * actions.
+   */
   attempt: number | undefined,
+  /**
+   * Identical to 'externalId' property of CheckRun. Not set for top-level
+   * actions.
+   */
   externalId: string | undefined,
-  /** Identical to 'checkName' property of CheckRun. */
-  checkName: string,
+  /**
+   * Identical to 'checkName' property of CheckRun. Not set for top-level
+   * actions.
+   */
+  checkName: string | undefined,
   /** Identical to 'name' property of Action entity. */
   actionName: string
 ) => Promise<ActionResult>;
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 e77a5e8..4fa84eb 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
@@ -95,7 +95,7 @@
   @property({type: String})
   _filter = '';
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   attached() {
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts
index 8a3e47f..f2b4c89 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts
@@ -99,7 +99,7 @@
     return htmlTemplate;
   }
 
-  private _account?: AccountDetailInfo;
+  private account?: AccountDetailInfo;
 
   @property({type: Object})
   params?: AdminViewParams;
@@ -173,7 +173,7 @@
   @property({type: Boolean})
   _showPluginList?: boolean;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   private readonly jsAPI = appContext.jsApiService;
 
@@ -189,7 +189,7 @@
       getPluginLoader().awaitPluginsLoaded(),
     ];
     return Promise.all(promises).then(result => {
-      this._account = result[0];
+      this.account = result[0];
       let options: AdminNavLinksOption | undefined = undefined;
       if (this._repoName) {
         options = {repoName: this._repoName};
@@ -204,7 +204,7 @@
       }
 
       return getAdminLinks(
-        this._account,
+        this.account,
         () =>
           this.restApiService.getAccountCapabilities().then(capabilities => {
             if (!capabilities) {
@@ -400,7 +400,7 @@
       }
       return '';
     }
-    // TODO(TS): The following condtion seems always false, because params
+    // TODO(TS): The following condition seems always false, because params
     // never has detailType property. Remove it.
     if (
       ((params as unknown) as AdminSubsectionLink).detailType &&
diff --git a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
index b68f720..e68f6c9 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
@@ -44,7 +44,7 @@
   @property({type: Boolean})
   _groupCreated = false;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   _computeGroupUrl(groupId: string) {
     return getBaseUrl() + '/admin/groups/' + encodeURL(groupId, true);
diff --git a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts
index d50d7c5..6334670 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts
@@ -68,7 +68,7 @@
     this.hasNewItemName = !!name;
   }
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   handleCreateItem() {
     if (!this.repoName) {
diff --git a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
index c9fd241..f708485 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
@@ -70,7 +70,7 @@
   @property({type: Object})
   _queryGroups: AutocompleteQuery;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
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 bc4750f..201b340 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
@@ -55,7 +55,7 @@
   @property({type: Boolean})
   _loading = true;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   attached() {
diff --git a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts
index 451139c..54f58c2 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts
@@ -117,7 +117,7 @@
 
   _itemId?: AccountId | GroupId;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
diff --git a/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts b/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
index 6f00445..84daef8 100644
--- a/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
@@ -126,7 +126,7 @@
   @property({type: Boolean})
   _isAdmin = false;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
diff --git a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
index 5702bfb..85ba052 100644
--- a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
+++ b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
@@ -140,7 +140,7 @@
   @property({type: Boolean})
   _originalExclusiveValue?: boolean;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
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 fc1ceee..f5e9a92 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
@@ -77,7 +77,7 @@
   @property({type: String})
   _filter = '';
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   attached() {
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts
index 935d091..56c5733 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts
@@ -118,9 +118,9 @@
   @property({type: Boolean})
   _loading = true;
 
-  private _originalInheritsFrom?: ProjectInfo | null;
+  private originalInheritsFrom?: ProjectInfo | null;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
@@ -173,7 +173,7 @@
               ...res.inherits_from,
             }
           : null;
-        this._originalInheritsFrom = res.inherits_from
+        this.originalInheritsFrom = res.inherits_from
           ? {
               ...res.inherits_from,
             }
@@ -306,7 +306,7 @@
     }
     // Restore inheritFrom.
     if (this._inheritsFrom) {
-      this._inheritsFrom = {...this._originalInheritsFrom};
+      this._inheritsFrom = {...this.originalInheritsFrom};
       this._inheritFromFilter =
         'name' in this._inheritsFrom ? this._inheritsFrom.name : undefined;
     }
@@ -446,8 +446,8 @@
       remove: {},
     };
 
-    const originalInheritsFromId = this._originalInheritsFrom
-      ? singleDecodeURL(this._originalInheritsFrom.id)
+    const originalInheritsFromId = this.originalInheritsFrom
+      ? singleDecodeURL(this.originalInheritsFrom.id)
       : null;
     // TODO(TS): this._inheritsFrom as ProjectInfo might be a mistake.
     // _inheritsFrom can be {}
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
index 14cf234..f209729 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
@@ -91,7 +91,7 @@
   @property({type: Boolean})
   _runningGC = false;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   attached() {
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 5f6cd29..7b3c7fb 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
@@ -50,7 +50,7 @@
   @property({type: Array})
   _dashboards?: DashboardRef[];
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   _repoChanged(repo?: RepoName) {
     this._loading = true;
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 c1c8475..d6aa0e6 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
@@ -88,7 +88,7 @@
     return this.computeShownItems(this._repos);
   }
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   attached() {
diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
index bcc6039..b6881ff 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
@@ -141,7 +141,7 @@
   @property({type: Array})
   weblinks: WebLinkInfo[] = [];
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   attached() {
diff --git a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_test.js b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_test.js
index b0065d9..9cc6357 100644
--- a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_test.js
+++ b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor_test.js
@@ -192,7 +192,7 @@
       };
       element.section = 'refs/*';
 
-      // Typically called on ready since elements will have properies defined
+      // Typically called on ready since elements will have properties defined
       // by the parent element.
       element._setupValues(element.rule);
       flush();
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
index 441d514..42741fa 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
@@ -111,7 +111,7 @@
   @property({type: String})
   _repo: string | null = null;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   created() {
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 f36df84..f26cd46 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
@@ -146,7 +146,7 @@
 
   flagsService = appContext.flagsService;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   keyboardShortcuts() {
     return {
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 841ee6e..816c8ef 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
@@ -58,7 +58,7 @@
 import {firePageError, fireTitleChange} from '../../../utils/event-util';
 import {GerritView} from '../../../services/router/router-model';
 
-const PROJECT_PLACEHOLDER_PATTERN = /\$\{project\}/g;
+const PROJECT_PLACEHOLDER_PATTERN = /\${project}/g;
 const RELOAD_DASHBOARD_INTERVAL_MS = 10 * 1000;
 
 export interface GrDashboardView {
@@ -121,7 +121,7 @@
 
   private reporting = appContext.reportingService;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   private lastVisibleTimestampMs = 0;
 
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 10f65a5..cfee0cd 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
@@ -54,7 +54,7 @@
   @property({type: String})
   _status = '';
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   _accountChanged(userId?: AccountId) {
     if (!userId) {
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
index 89ca4ef..87b09c7 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
@@ -553,7 +553,7 @@
   @property({type: Object})
   _config?: ServerInfo;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /** @override */
   created() {
@@ -2068,10 +2068,10 @@
    *
    */
   _waitForChangeReachable(changeNum: NumericChangeId) {
-    let attempsRemaining = AWAIT_CHANGE_ATTEMPTS;
+    let attemptsRemaining = AWAIT_CHANGE_ATTEMPTS;
     return new Promise(resolve => {
       const check = () => {
-        attempsRemaining--;
+        attemptsRemaining--;
         // Pass a no-op error handler to avoid the "not found" error toast.
         this.restApiService
           .getChange(changeNum, () => {})
@@ -2082,7 +2082,7 @@
               return;
             }
 
-            if (attempsRemaining) {
+            if (attemptsRemaining) {
               this.async(check, AWAIT_CHANGE_TIMEOUT_MS);
             } else {
               resolve(false);
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
index 6c9a27d..fbb70b7 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
@@ -2110,7 +2110,7 @@
 
       element = basicFixture.instantiate();
       // getChangeRevisionActions is not called without
-      // set the following properies
+      // set the following properties
       element.change = {};
       element.changeNum = '42';
       element.latestPatchNum = '2';
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 f172ccc..e02b337 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
@@ -99,6 +99,9 @@
       padding-left: 0;
     }
   </style>
+  <template is="dom-if" if="[[_isNewChangeSummaryUiEnabled]]">
+    <h3 class="metadata-title">Submit requirements</h3>
+  </template>
   <template is="dom-repeat" items="[[_requirements]]">
     <gr-endpoint-decorator
       class="submit-requirement-endpoints"
@@ -126,9 +129,6 @@
       </div>
     </gr-endpoint-decorator>
   </template>
-  <template is="dom-if" if="[[_isNewChangeSummaryUiEnabled]]">
-    <h3 class="metadata-title">Submit requirements</h3>
-  </template>
   <template is="dom-repeat" items="[[_requiredLabels]]">
     <section>
       <div class="title">
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 8f74f76..3d7646f 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
@@ -108,6 +108,9 @@
   QuickLabelInfo,
   ApprovalInfo,
   ElementPropertyDeepChange,
+  ChangeId,
+  RelatedChangeAndCommitInfo,
+  RelatedChangesInfo,
 } from '../../../types/common';
 import {DiffPreferencesInfo} from '../../../types/diff';
 import {GrReplyDialog, FocusTarget} from '../gr-reply-dialog/gr-reply-dialog';
@@ -2293,7 +2296,27 @@
       const relatedChangesLoaded = coreDataPromise.then(() => {
         this.getRelatedChangesList()?.reload();
         if (this._isNewChangeSummaryUiEnabled) {
-          this.getRelatedChangesListExperimental()?.reload();
+          let relatedChangesPromise:
+            | Promise<RelatedChangesInfo | undefined>
+            | undefined;
+          const patchNum = this._computeLatestPatchNum(this._allPatchSets);
+          if (this._change && patchNum) {
+            relatedChangesPromise = this.restApiService
+              .getRelatedChanges(this._change._number, patchNum)
+              .then(response => {
+                if (this._change && response) {
+                  this.hasParent = this._calculateHasParent(
+                    this._change.change_id,
+                    response.changes
+                  );
+                }
+                return response;
+              });
+          }
+          // TODO: use returned Promise
+          this.getRelatedChangesListExperimental()?.reload(
+            relatedChangesPromise
+          );
         }
       });
       allDataPromises.push(relatedChangesLoaded);
@@ -2310,6 +2333,21 @@
   }
 
   /**
+   * Determines whether or not the given change has a parent change. If there
+   * is a relation chain, and the change id is not the last item of the
+   * relation chain, there is a parent.
+   */
+  _calculateHasParent(
+    currentChangeId: ChangeId,
+    relatedChanges: RelatedChangeAndCommitInfo[]
+  ) {
+    return (
+      relatedChanges.length > 0 &&
+      relatedChanges[relatedChanges.length - 1].change_id !== currentChangeId
+    );
+  }
+
+  /**
    * Kicks off requests for resources that rely on the patch range
    * (`this._patchRange`) being defined.
    */
@@ -2780,7 +2818,7 @@
   /**
    * Wrapper for using in the element template and computed properties
    */
-  _computeLatestPatchNum(allPatchSets: PatchSet[]) {
+  _computeLatestPatchNum(allPatchSets?: PatchSet[]) {
     return computeLatestPatchNum(allPatchSets);
   }
 
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 10cffba..225e3e9 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
@@ -144,7 +144,7 @@
 
   private selectedChangeIds = new Set<ChangeInfoId>();
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
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 ff61de9..5e95e66 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
@@ -67,7 +67,7 @@
     };
   }
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
index 9dcd849..b2b6e61 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
@@ -89,7 +89,7 @@
   @property({type: Array})
   _recentChanges?: RebaseChange[];
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   constructor() {
     super();
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 a5c0624..c2947a6 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
@@ -803,7 +803,7 @@
   }
 
   /**
-   * Handle all events from the file list dom-repeat so event handleers don't
+   * Handle all events from the file list dom-repeat so event handlers don't
    * have to get registered for potentially very long lists.
    */
   _handleFileListClick(e: MouseEvent) {
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 285b73f..80d8729 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
@@ -1244,7 +1244,7 @@
       // are no deletions.
       assert.equal(element._computeBarAdditionWidth(file, stats), 30);
 
-      // If there are no insetions, there is no width.
+      // If there are no insertions, there is no width.
       stats.maxInserted = 0;
       assert.equal(element._computeBarAdditionWidth(file, stats), 0);
 
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 2fe409a..f913459 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
@@ -54,7 +54,7 @@
 } from '../../../utils/patch-set-util';
 import {isServiceUser} from '../../../utils/account-util';
 
-const PATCH_SET_PREFIX_PATTERN = /^(?:Uploaded\s*)?(?:P|p)atch (?:S|s)et \d+:\s*(.*)/;
+const PATCH_SET_PREFIX_PATTERN = /^(?:Uploaded\s*)?[Pp]atch [Ss]et \d+:\s*(.*)/;
 const LABEL_TITLE_SCORE_PATTERN = /^(-?)([A-Za-z0-9-]+?)([+-]\d+)?[.]?$/;
 const UPLOADED_NEW_PATCHSET_PATTERN = /Uploaded patch set (\d+)./;
 const MERGED_PATCHSET_PATTERN = /(\d+) is the latest approved patch-set/;
@@ -484,7 +484,7 @@
   _handleAnchorClick(e: Event) {
     e.preventDefault();
     // The element which triggers _handleAnchorClick is rendered only if
-    // message.id defined: the elemenet is wrapped in dom-if if="[[message.id]]"
+    // message.id defined: the element is wrapped in dom-if if="[[message.id]]"
     const detail: MessageAnchorTapDetail = {
       id: this.message!.id,
     };
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 9877a95..bc3f167 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
@@ -118,7 +118,7 @@
 
 /**
  * If messages have the same tag, then that influences grouping and whether
- * a message is initally hidden or not, see isImportant(). So we are applying
+ * a message is initially hidden or not, see isImportant(). So we are applying
  * some "magic" rules here in order to hide exactly the right messages.
  *
  * 1. If a message does not have a tag, but is associated with robot comments,
@@ -263,7 +263,7 @@
   _combinedMessages: CombinedMessage[] = [];
 
   @property({type: Object, computed: '_computeLabelExtremes(labels.*)'})
-  _labelExtremes: {[lableName: string]: VotingRangeInfo} = {};
+  _labelExtremes: {[labelName: string]: VotingRangeInfo} = {};
 
   private readonly reporting = appContext.reportingService;
 
@@ -466,7 +466,7 @@
       LabelNameToInfoMap
     >
   ) {
-    const extremes: {[lableName: string]: VotingRangeInfo} = {};
+    const extremes: {[labelName: string]: VotingRangeInfo} = {};
     const labels = labelRecord.base;
     if (!labels) {
       return extremes;
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-changes-list-experimental.ts b/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-changes-list-experimental.ts
index fbbef12..e921979 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-changes-list-experimental.ts
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-changes-list-experimental.ts
@@ -16,9 +16,12 @@
  */
 import {html, nothing} from 'lit-html';
 import './gr-related-change';
+import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
+import '../../plugins/gr-endpoint-param/gr-endpoint-param';
+import '../../plugins/gr-endpoint-slot/gr-endpoint-slot';
 import {classMap} from 'lit-html/directives/class-map';
 import {GrLitElement} from '../../lit/gr-lit-element';
-import {customElement, property, css} from 'lit-element';
+import {customElement, property, css, internalProperty} from 'lit-element';
 import {sharedStyles} from '../../../styles/shared-styles';
 import {
   SubmittedTogetherInfo,
@@ -32,7 +35,11 @@
 import {ParsedChangeInfo} from '../../../types/types';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {pluralize} from '../../../utils/string-util';
-import {getRevisionKey, isChangeInfo} from '../../../utils/change-util';
+import {
+  changeIsOpen,
+  getRevisionKey,
+  isChangeInfo,
+} from '../../../utils/change-util';
 
 /** What is the maximum number of shown changes in collapsed list? */
 const MAX_CHANGES_WHEN_COLLAPSED = 3;
@@ -46,13 +53,25 @@
   patchNum?: PatchSetNum;
 
   @property()
-  _submittedTogether?: SubmittedTogetherInfo = {
+  mergeable?: boolean;
+
+  @internalProperty()
+  submittedTogether?: SubmittedTogetherInfo = {
     changes: [],
     non_visible_changes: 0,
   };
 
-  @property()
-  _relatedResponse?: RelatedChangesInfo = {changes: []};
+  @internalProperty()
+  relatedChanges: RelatedChangeAndCommitInfo[] = [];
+
+  @internalProperty()
+  conflictingChanges: ChangeInfo[] = [];
+
+  @internalProperty()
+  cherryPickChanges: ChangeInfo[] = [];
+
+  @internalProperty()
+  sameTopicChanges: ChangeInfo[] = [];
 
   private readonly restApiService = appContext.restApiService;
 
@@ -62,6 +81,7 @@
       css`
         .note {
           color: var(--error-text-color);
+          margin-left: 1.2em;
         }
         section {
           margin-bottom: var(--spacing-m);
@@ -71,27 +91,26 @@
   }
 
   render() {
-    const relatedChanges = this._relatedResponse?.changes ?? [];
     let showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
-      relatedChanges.length,
-      relatedChanges.findIndex(relatedChange =>
+      this.relatedChanges.length,
+      this.relatedChanges.findIndex(relatedChange =>
         this._changesEqual(relatedChange, this.change)
       )
     );
     const connectedRevisions = this._computeConnectedRevisions(
       this.change,
       this.patchNum,
-      relatedChanges
+      this.relatedChanges
     );
     const relatedChangeSection = html` <section
       class="relatedChanges"
-      ?hidden=${!relatedChanges.length}
+      ?hidden=${!this.relatedChanges.length}
     >
       <gr-related-collapse
         title="Relation chain"
-        .length=${relatedChanges.length}
+        .length=${this.relatedChanges.length}
       >
-        ${relatedChanges.map(
+        ${this.relatedChanges.map(
           (change, index) =>
             html`<gr-related-change
               class="${classMap({
@@ -114,9 +133,9 @@
       </gr-related-collapse>
     </section>`;
 
-    const submittedTogetherChanges = this._submittedTogether?.changes ?? [];
+    const submittedTogetherChanges = this.submittedTogether?.changes ?? [];
     const countNonVisibleChanges =
-      this._submittedTogether?.non_visible_changes ?? 0;
+      this.submittedTogether?.non_visible_changes ?? 0;
     showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
       submittedTogetherChanges.length,
       submittedTogetherChanges.findIndex(relatedChange =>
@@ -126,7 +145,7 @@
     const submittedTogetherSection = html`<section
       id="submittedTogether"
       ?hidden=${!submittedTogetherChanges?.length &&
-      !this._submittedTogether?.non_visible_changes}
+      !this.submittedTogether?.non_visible_changes}
     >
       <gr-related-collapse
         title="Submitted together"
@@ -155,11 +174,106 @@
       </div>
     </section>`;
 
-    return html`${relatedChangeSection}${submittedTogetherSection}`;
+    showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
+      this.sameTopicChanges.length,
+      -1
+    );
+    const sameTopicSection = html`<section
+      id="sameTopic"
+      ?hidden=${!this.sameTopicChanges?.length}
+    >
+      <gr-related-collapse
+        title="Same topic"
+        .length=${this.sameTopicChanges.length}
+      >
+        ${this.sameTopicChanges.map(
+          (change, index) =>
+            html`<gr-related-change
+              class="${classMap({
+                ['show-when-collapsed']: showWhenCollapsedPredicate(index),
+              })}"
+              .change="${change}"
+              .href="${GerritNav.getUrlForChangeById(
+                change._number,
+                change.project
+              )}"
+              >${change.project}: ${change.branch}:
+              ${change.subject}</gr-related-change
+            >`
+        )}
+      </gr-related-collapse>
+    </section>`;
+
+    showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
+      this.conflictingChanges.length,
+      -1
+    );
+    const mergeConflictsSection = html`<section
+      id="mergeConflicts"
+      ?hidden=${!this.conflictingChanges?.length}
+    >
+      <gr-related-collapse
+        title="Merge conflicts"
+        .length=${this.conflictingChanges.length}
+      >
+        ${this.conflictingChanges.map(
+          (change, index) =>
+            html`<gr-related-change
+              class="${classMap({
+                ['show-when-collapsed']: showWhenCollapsedPredicate(index),
+              })}"
+              .change="${change}"
+              .href="${GerritNav.getUrlForChangeById(
+                change._number,
+                change.project
+              )}"
+              >${change.subject}</gr-related-change
+            >`
+        )}
+      </gr-related-collapse>
+    </section>`;
+
+    showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
+      this.cherryPickChanges.length,
+      -1
+    );
+    const cherryPicksSection = html`<section
+      id="cherryPicks"
+      ?hidden=${!this.cherryPickChanges?.length}
+    >
+      <gr-related-collapse
+        title="Cherry picks"
+        .length=${this.cherryPickChanges.length}
+      >
+        ${this.cherryPickChanges.map(
+          (change, index) =>
+            html`<gr-related-change
+              class="${classMap({
+                ['show-when-collapsed']: showWhenCollapsedPredicate(index),
+              })}"
+              .change="${change}"
+              .href="${GerritNav.getUrlForChangeById(
+                change._number,
+                change.project
+              )}"
+              >${change.branch}: ${change.subject}</gr-related-change
+            >`
+        )}
+      </gr-related-collapse>
+    </section>`;
+
+    return html`<gr-endpoint-decorator name="related-changes-section">
+      <gr-endpoint-param name="change" value="[[change]]"></gr-endpoint-param>
+      <gr-endpoint-slot name="top"></gr-endpoint-slot>
+      ${relatedChangeSection} ${submittedTogetherSection} ${sameTopicSection}
+      ${mergeConflictsSection} ${cherryPicksSection}
+      <gr-endpoint-slot name="bottom"></gr-endpoint-slot>
+    </gr-endpoint-decorator>`;
   }
 
   showWhenCollapsedPredicateFactory(length: number, highlightIndex: number) {
     return (index: number) => {
+      if (highlightIndex === -1) return index < MAX_CHANGES_WHEN_COLLAPSED;
       if (highlightIndex === 0) return index <= MAX_CHANGES_WHEN_COLLAPSED - 1;
       if (highlightIndex === length - 1)
         return index >= length - MAX_CHANGES_WHEN_COLLAPSED;
@@ -170,25 +284,65 @@
     };
   }
 
-  reload() {
-    if (!this.change) return Promise.reject(new Error('change missing'));
+  reload(getRelatedChanges?: Promise<RelatedChangesInfo | undefined>) {
+    const change = this.change;
+    if (!change) return Promise.reject(new Error('change missing'));
     if (!this.patchNum) return Promise.reject(new Error('patchNum missing'));
+    if (!getRelatedChanges) {
+      getRelatedChanges = this.restApiService.getRelatedChanges(
+        change._number,
+        this.patchNum
+      );
+    }
     const promises: Array<Promise<void>> = [
+      getRelatedChanges.then(response => {
+        if (!response) {
+          throw new Error('getRelatedChanges returned undefined response');
+        }
+        this.relatedChanges = response?.changes ?? [];
+      }),
       this.restApiService
-        .getRelatedChanges(this.change._number, this.patchNum)
+        .getChangesSubmittedTogether(change._number)
         .then(response => {
-          if (!response) {
-            throw new Error('getRelatedChanges returned undefined response');
-          }
-          this._relatedResponse = response;
+          this.submittedTogether = response;
         }),
       this.restApiService
-        .getChangesSubmittedTogether(this.change._number)
+        .getChangeCherryPicks(change.project, change.change_id, change._number)
         .then(response => {
-          this._submittedTogether = response;
+          this.cherryPickChanges = response || [];
         }),
     ];
 
+    // Get conflicts if change is open and is mergeable.
+    // Mergeable is output of restApiServict.getMergeable from gr-change-view
+    if (changeIsOpen(change) && this.mergeable) {
+      promises.push(
+        this.restApiService
+          .getChangeConflicts(change._number)
+          .then(response => {
+            this.conflictingChanges = response ?? [];
+          })
+      );
+    }
+    if (change.topic) {
+      const changeTopic = change.topic;
+      promises.push(
+        this.restApiService.getConfig().then(config => {
+          if (config && !config.change.submit_whole_topic) {
+            return this.restApiService
+              .getChangesWithSameTopic(changeTopic, change._number)
+              .then(response => {
+                if (changeTopic === this.change?.topic) {
+                  this.sameTopicChanges = response ?? [];
+                }
+              });
+          }
+          this.sameTopicChanges = [];
+          return Promise.resolve();
+        })
+      );
+    }
+
     return Promise.all(promises);
   }
 
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts
index 8cb0638..9941fa9 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list_html.ts
@@ -193,6 +193,7 @@
               href$="[[_computeChangeURL(change._number, change.project)]]"
               class$="[[_computeLinkClass(change)]]"
               title$="[[change.subject]]"
+              on-click="_reportClick"
             >
               [[change.subject]]
             </a>
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
index 705a402..a8e89b6 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
@@ -784,7 +784,7 @@
   }
 
   _handle400Error(r?: Response | null) {
-    if (!r) throw new Error('Reponse is empty.');
+    if (!r) throw new Error('Response is empty.');
     let response: Response = r;
     // A call to _saveReview could fail with a server error if erroneous
     // reviewers were requested. This is signalled with a 400 Bad Request
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js
index 6682bfb..0575239 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js
@@ -1276,7 +1276,7 @@
         'Send and Start review');
   });
 
-  test('_handle400Error reviewrs and CCs', done => {
+  test('_handle400Error reviewers and CCs', done => {
     const error1 = 'error 1';
     const error2 = 'error 2';
     const error3 = 'error 3';
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-results.ts b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
index 007af97..e448374 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-results.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
@@ -15,7 +15,14 @@
  * limitations under the License.
  */
 import {html} from 'lit-html';
-import {css, customElement, property, PropertyValues} from 'lit-element';
+import {
+  css,
+  customElement,
+  internalProperty,
+  property,
+  PropertyValues,
+  query,
+} from 'lit-element';
 import {GrLitElement} from '../lit/gr-lit-element';
 import {Category, CheckRun, Link, RunStatus, Tag} from '../../api/checks';
 import {sharedStyles} from '../../styles/shared-styles';
@@ -26,6 +33,8 @@
   iconForCategory,
   isRunning,
 } from '../../services/checks/checks-util';
+import {assertIsDefined} from '../../utils/common-util';
+import {whenVisible} from '../../utils/dom-util';
 
 @customElement('gr-result-row')
 class GrResultRow extends GrLitElement {
@@ -38,6 +47,9 @@
   @property({type: Boolean, reflect: true})
   isExpandable = false;
 
+  @property()
+  shouldRender = false;
+
   static get styles() {
     return [
       sharedStyles,
@@ -81,7 +93,7 @@
         }
         td .summary-cell {
           display: flex;
-          max-width: calc(100vw - 579px);
+          max-width: calc(100vw - 700px);
         }
         td .summary-cell .summary {
           font-weight: var(--font-weight-bold);
@@ -126,8 +138,26 @@
     super.update(changedProperties);
   }
 
+  firstUpdated() {
+    const loading = this.shadowRoot?.querySelector('.container');
+    assertIsDefined(loading, '"Loading" element');
+    whenVisible(loading, () => this.setAttribute('shouldRender', 'true'), 200);
+  }
+
   render() {
     if (!this.result) return '';
+    if (!this.shouldRender) {
+      return html`
+        <tr class="container">
+          <td class="iconCol"></td>
+          <td class="nameCol">
+            <div><span class="loading">Loading...</span></div>
+          </td>
+          <td class="summaryCol"></td>
+          <td class="expanderCol"></td>
+        </tr>
+      `;
+    }
     return html`
       <tr class="container" @click="${this.toggleExpanded}">
         <td class="iconCol">
@@ -237,15 +267,31 @@
   render() {
     if (!this.result) return '';
     return html`
-      <div class="message">
-        ${this.result.message}
-      </div>
+      <gr-endpoint-decorator name="check-result-expanded">
+        <gr-endpoint-param
+          name="run"
+          value="${this.result}"
+        ></gr-endpoint-param>
+        <gr-endpoint-param
+          name="result"
+          value="${this.result}"
+        ></gr-endpoint-param>
+        <div class="message">
+          ${this.result.message}
+        </div>
+      </gr-endpoint-decorator>
     `;
   }
 }
 
 @customElement('gr-checks-results')
 export class GrChecksResults extends GrLitElement {
+  @query('#filterInput')
+  filterInput?: HTMLInputElement;
+
+  @internalProperty()
+  filterRegExp = new RegExp('');
+
   @property()
   runs: CheckRun[] = [];
 
@@ -257,6 +303,11 @@
           display: block;
           padding: var(--spacing-xl);
         }
+        input#filterInput {
+          margin-top: var(--spacing-s);
+          padding: var(--spacing-s) var(--spacing-m);
+          min-width: 400px;
+        }
         .categoryHeader {
           margin-top: var(--spacing-l);
           margin-left: var(--spacing-l);
@@ -300,12 +351,30 @@
   render() {
     return html`
       <div><h2 class="heading-2">Results</h2></div>
-      ${this.renderNoCompleted()} ${this.renderSection(Category.ERROR)}
+      ${this.renderFilter()} ${this.renderNoCompleted()}
+      ${this.renderSection(Category.ERROR)}
       ${this.renderSection(Category.WARNING)}
       ${this.renderSection(Category.INFO)} ${this.renderSuccess()}
     `;
   }
 
+  renderFilter() {
+    if (this.runs.length === 0) return;
+    return html`
+      <input
+        id="filterInput"
+        type="text"
+        placeholder="Filter results by regular expression"
+        @input="${this.onInput}"
+      />
+    `;
+  }
+
+  onInput() {
+    assertIsDefined(this.filterInput, 'filter <input> element');
+    this.filterRegExp = new RegExp(this.filterInput.value, 'i');
+  }
+
   renderNoCompleted() {
     if (this.runs.some(hasCompleted)) return;
     let text = 'No results';
@@ -348,6 +417,11 @@
   renderRun(category: Category, run: CheckRun) {
     return html`${run.results
       ?.filter(result => result.category === category)
+      .filter(
+        result =>
+          this.filterRegExp.test(run.checkName) ||
+          this.filterRegExp.test(result.summary)
+      )
       .map(
         result =>
           html`<gr-result-row .result="${{...run, ...result}}"></gr-result-row>`
@@ -355,7 +429,9 @@
   }
 
   renderSuccess() {
-    const runs = this.runs.filter(hasCompletedWithoutResults);
+    const runs = this.runs
+      .filter(hasCompletedWithoutResults)
+      .filter(r => this.filterRegExp.test(r.checkName));
     if (runs.length === 0) return;
     return html`
       <h3 class="categoryHeader heading-3">
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
index 4a34700..f8584bc 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
@@ -16,12 +16,19 @@
  */
 import {html} from 'lit-html';
 import {classMap} from 'lit-html/directives/class-map';
-import {css, customElement, property} from 'lit-element';
+import {
+  css,
+  customElement,
+  internalProperty,
+  property,
+  query,
+} from 'lit-element';
 import {GrLitElement} from '../lit/gr-lit-element';
 import {Action, CheckRun, RunStatus} from '../../api/checks';
 import {sharedStyles} from '../../styles/shared-styles';
 import {
   compareByWorstCategory,
+  fireActionTriggered,
   iconForRun,
   primaryRunAction,
 } from '../../services/checks/checks-util';
@@ -34,15 +41,14 @@
   fakeRun4,
   updateStateSetResults,
 } from '../../services/checks/checks-model';
+import {assertIsDefined, toggleSetMembership} from '../../utils/common-util';
+import {whenVisible} from '../../utils/dom-util';
 
-/* The RunSelectedEvent is only used locally to communicate from <gr-checks-run>
-   to its <gr-checks-runs> parent. */
-
-interface RunSelectedEventDetail {
+export interface RunSelectedEventDetail {
   checkName: string;
 }
 
-type RunSelectedEvent = CustomEvent<RunSelectedEventDetail>;
+export type RunSelectedEvent = CustomEvent<RunSelectedEventDetail>;
 
 declare global {
   interface HTMLElementEventMap {
@@ -54,33 +60,6 @@
   target.dispatchEvent(
     new CustomEvent('run-selected', {
       detail: {checkName},
-      composed: false,
-      bubbles: false,
-    })
-  );
-}
-
-export interface ActionTriggeredEventDetail {
-  action: Action;
-  run: CheckRun;
-}
-
-export type ActionTriggeredEvent = CustomEvent<ActionTriggeredEventDetail>;
-
-declare global {
-  interface HTMLElementEventMap {
-    'action-triggered': ActionTriggeredEvent;
-  }
-}
-
-function fireActionTriggered(
-  target: EventTarget,
-  action: Action,
-  run: CheckRun
-) {
-  target.dispatchEvent(
-    new CustomEvent('action-triggered', {
-      detail: {action, run},
       composed: true,
       bubbles: true,
     })
@@ -106,6 +85,11 @@
           margin-top: var(--spacing-s);
           cursor: pointer;
         }
+        .left {
+          overflow: hidden;
+          white-space: nowrap;
+          text-overflow: ellipsis;
+        }
         .name {
           font-weight: var(--font-weight-bold);
         }
@@ -127,6 +111,9 @@
         .chip.placeholder {
           border-left: var(--thick-border) solid var(--border-color);
         }
+        .chip.placeholder iron-icon {
+          display: none;
+        }
         .chip.error iron-icon {
           color: var(--error-foreground);
         }
@@ -145,9 +132,21 @@
           background-color: var(--selected-background);
           padding-left: calc(var(--spacing-m) + var(--thick-border) - 1px);
         }
+        div.chip.deselected {
+          border: 1px solid var(--gray-foreground);
+          background-color: transparent;
+          padding-left: calc(var(--spacing-m) + var(--thick-border) - 1px);
+        }
         div.chip.selected iron-icon {
           color: var(--selected-foreground);
         }
+        div.chip.deselected iron-icon {
+          color: var(--gray-foreground);
+        }
+        .chip.selected gr-button.action,
+        .chip.deselected gr-button.action {
+          display: none;
+        }
         gr-button.action {
           --padding: var(--spacing-xs) var(--spacing-m);
           /* The button should fit into the 20px line-height. The negative
@@ -160,15 +159,40 @@
     ];
   }
 
+  @query('.chip')
+  chipElement?: HTMLElement;
+
   @property()
   run!: CheckRun;
 
   @property()
   selected = false;
 
+  @property()
+  deselected = false;
+
+  @property()
+  shouldRender = false;
+
+  firstUpdated() {
+    assertIsDefined(this.chipElement, 'chip element');
+    whenVisible(
+      this.chipElement,
+      () => this.setAttribute('shouldRender', 'true'),
+      200
+    );
+  }
+
   render() {
-    const icon = this.selected ? 'check-circle' : iconForRun(this.run);
-    const classes = {chip: true, [icon]: true, selected: this.selected};
+    if (!this.shouldRender) return html`<div class="chip">Loading ...</div>`;
+
+    const icon = this.selected ? 'filter' : iconForRun(this.run);
+    const classes = {
+      chip: true,
+      [icon]: true,
+      selected: this.selected,
+      deselected: this.deselected,
+    };
     const action = primaryRunAction(this.run);
 
     return html`
@@ -206,6 +230,12 @@
 
 @customElement('gr-checks-runs')
 export class GrChecksRuns extends GrLitElement {
+  @query('#filterInput')
+  filterInput?: HTMLInputElement;
+
+  @internalProperty()
+  filterRegExp = new RegExp('');
+
   @property()
   runs: CheckRun[] = [];
 
@@ -228,6 +258,11 @@
           padding-top: var(--spacing-l);
           text-transform: capitalize;
         }
+        input#filterInput {
+          margin-top: var(--spacing-s);
+          padding: var(--spacing-s) var(--spacing-m);
+          width: 100%;
+        }
         .testing {
           margin-top: var(--spacing-xxl);
           color: var(--deemphasized-text-color);
@@ -248,6 +283,12 @@
   render() {
     return html`
       <h2 class="heading-2">Runs</h2>
+      <input
+        id="filterInput"
+        type="text"
+        placeholder="Filter runs by regular expression"
+        @input="${this.onInput}"
+      />
       ${this.renderSection(RunStatus.COMPLETED)}
       ${this.renderSection(RunStatus.RUNNING)}
       ${this.renderSection(RunStatus.RUNNABLE)}
@@ -274,6 +315,11 @@
     `;
   }
 
+  onInput() {
+    assertIsDefined(this.filterInput, 'filter <input> element');
+    this.filterRegExp = new RegExp(this.filterInput.value, 'i');
+  }
+
   none() {
     updateStateSetResults('f0', []);
     updateStateSetResults('f1', []);
@@ -298,6 +344,7 @@
   renderSection(status: RunStatus) {
     const runs = this.runs
       .filter(r => r.status === status)
+      .filter(r => this.filterRegExp.test(r.checkName))
       .sort(compareByWorstCategory);
     if (runs.length === 0) return;
     return html`
@@ -310,20 +357,17 @@
 
   renderRun(run: CheckRun) {
     const selected = this.selectedRuns.has(run.checkName);
+    const deselected = !selected && this.selectedRuns.size > 0;
     return html`<gr-checks-run
       .run="${run}"
       .selected="${selected}"
+      .deselected="${deselected}"
       @run-selected="${this.handleRunSelected}"
     ></gr-checks-run>`;
   }
 
   handleRunSelected(e: RunSelectedEvent) {
-    const checkName = e.detail.checkName;
-    if (this.selectedRuns.has(checkName)) {
-      this.selectedRuns.delete(checkName);
-    } else {
-      this.selectedRuns.add(checkName);
-    }
+    toggleSetMembership(this.selectedRuns, e.detail.checkName);
     this.requestUpdate();
   }
 }
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-tab.ts b/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
index d31ec53..0ce81ed 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
@@ -18,13 +18,25 @@
 import {css, customElement, property} from 'lit-element';
 import {GrLitElement} from '../lit/gr-lit-element';
 import {Action, CheckResult, CheckRun} from '../../api/checks';
-import {allResults$, allRuns$} from '../../services/checks/checks-model';
+import {
+  allActions$,
+  allResults$,
+  allRuns$,
+} from '../../services/checks/checks-model';
 import './gr-checks-runs';
 import './gr-checks-results';
 import {sharedStyles} from '../../styles/shared-styles';
 import {changeNum$, currentPatchNum$} from '../../services/change/change-model';
 import {NumericChangeId, PatchSetNum} from '../../types/common';
-import {ActionTriggeredEvent} from './gr-checks-runs';
+import {
+  ActionTriggeredEvent,
+  fireActionTriggered,
+} from '../../services/checks/checks-util';
+import {
+  checkRequiredProperty,
+  toggleSetMembership,
+} from '../../utils/common-util';
+import {RunSelectedEvent} from './gr-checks-runs';
 
 /**
  * The "Checks" tab on the Gerrit change page. Gets its data from plugins that
@@ -37,15 +49,20 @@
 
   results: CheckResult[] = [];
 
+  actions: Action[] = [];
+
   @property()
   currentPatchNum: PatchSetNum | undefined = undefined;
 
   @property()
   changeNum: NumericChangeId | undefined = undefined;
 
+  private selectedRuns = new Set<string>();
+
   constructor() {
     super();
     this.subscribe('runs', allRuns$);
+    this.subscribe('actions', allActions$);
     this.subscribe('results', allResults$);
     this.subscribe('currentPatchNum', currentPatchNum$);
     this.subscribe('changeNum', changeNum$);
@@ -63,17 +80,13 @@
           display: block;
         }
         .header {
-          display: block;
+          display: flex;
+          justify-content: space-between;
           padding: var(--spacing-m) var(--spacing-l);
           border-bottom: 1px solid var(--border-color);
         }
-        .header span {
-          display: inline-block;
-          color: var(--link-color);
-          padding: var(--spacing-s) var(--spacing-m);
-          margin-right: var(--spacing-l);
-          border: 1px solid var(--border-color);
-          border-radius: var(--border-radius);
+        .action {
+          margin-left: var(--spacing-m);
         }
         .container {
           display: flex;
@@ -93,29 +106,47 @@
 
   render() {
     const ps = `Patchset ${this.currentPatchNum} (Latest)`;
+    const filteredRuns = this.runs.filter(
+      r => this.selectedRuns.size === 0 || this.selectedRuns.has(r.checkName)
+    );
     return html`
       <div class="header">
-        <gr-dropdown-list
-          value="${ps}"
-          .items="${[
-            {
-              value: `${ps}`,
-              text: `${ps}`,
-            },
-          ]}"
-        ></gr-dropdown-list>
+        <div class="left">
+          <gr-dropdown-list
+            value="${ps}"
+            .items="${[
+              {
+                value: `${ps}`,
+                text: `${ps}`,
+              },
+            ]}"
+          ></gr-dropdown-list>
+        </div>
+        <div class="right">
+          ${this.actions.map(this.renderAction)}
+        </div>
       </div>
       <div class="container">
-        <gr-checks-runs class="runs" .runs="${this.runs}"></gr-checks-runs>
+        <gr-checks-runs
+          class="runs"
+          .runs="${this.runs}"
+          @run-selected="${this.handleRunSelected}"
+        ></gr-checks-runs>
         <gr-checks-results
           class="results"
-          .runs="${this.runs}"
+          .runs="${filteredRuns}"
         ></gr-checks-results>
       </div>
     `;
   }
 
-  private handleActionTriggered(action: Action, run: CheckRun) {
+  renderAction(action: Action) {
+    return html`<gr-checks-top-level-action
+      .action="${action}"
+    ></gr-checks-top-level-action>`;
+  }
+
+  handleActionTriggered(action: Action, run?: CheckRun) {
     if (!this.changeNum) return;
     if (!this.currentPatchNum) return;
     // TODO(brohlfs): The callback is supposed to be returning a promise.
@@ -124,16 +155,45 @@
     action.callback(
       this.changeNum,
       this.currentPatchNum as number,
-      run.attempt,
-      run.externalId,
-      run.checkName,
+      run?.attempt,
+      run?.externalId,
+      run?.checkName,
       action.name
     );
   }
+
+  handleRunSelected(e: RunSelectedEvent) {
+    toggleSetMembership(this.selectedRuns, e.detail.checkName);
+    this.requestUpdate();
+  }
+}
+
+@customElement('gr-checks-top-level-action')
+export class GrChecksTopLevelAction extends GrLitElement {
+  @property()
+  action!: Action;
+
+  connectedCallback() {
+    super.connectedCallback();
+    checkRequiredProperty(this.action, 'action');
+  }
+
+  render() {
+    return html`
+      <gr-button link class="action" @click="${this.handleClick}"
+        >${this.action.name}</gr-button
+      >
+    `;
+  }
+
+  handleClick() {
+    fireActionTriggered(this, this.action);
+  }
 }
 
 declare global {
   interface HTMLElementTagNameMap {
     'gr-checks-tab': GrChecksTab;
+    'gr-checks-top-level-action': GrChecksTopLevelAction;
   }
 }
diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js
index 3f6148b..092daa2 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js
@@ -21,7 +21,6 @@
 import {__testOnly_ErrorType} from './gr-error-manager.js';
 import {stubRestApi} from '../../../test/test-utils.js';
 import {appContext} from '../../../services/app-context.js';
-import {createPreferences} from '../../../test/test-data-generators.js';
 
 const basicFixture = fixtureFromElement('gr-error-manager');
 
@@ -41,8 +40,6 @@
           .returns(Promise.resolve({ok: true, status: 204}));
       getLoggedInStub = stubRestApi('getLoggedIn')
           .callsFake(() => appContext.authService.authCheck());
-      stubRestApi('getPreferences').returns(Promise.resolve(
-          createPreferences()));
       element = basicFixture.instantiate();
       element._authService.clearCache();
       toastSpy = sinon.spy(element, '_createToastAlert');
diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts
index b43b3b0..bed07a6 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts
@@ -304,7 +304,7 @@
         if (!config) {
           throw new Error('getConfig returned undefined');
         }
-        this._retreiveFeedbackURL(config);
+        this._retrieveFeedbackURL(config);
         this._retrieveRegisterURL(config);
         return getDocsBaseUrl(config, this.restApiService);
       })
@@ -325,7 +325,7 @@
     });
   }
 
-  _retreiveFeedbackURL(config: ServerInfo) {
+  _retrieveFeedbackURL(config: ServerInfo) {
     if (config.gerrit?.report_bug_url) {
       this._feedbackURL = config.gerrit.report_bug_url;
     }
diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_test.ts b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_test.ts
index 7430cc0..d9c43d6 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_test.ts
@@ -488,7 +488,7 @@
         report_bug_url: url,
       },
     };
-    element._retreiveFeedbackURL(config);
+    element._retrieveFeedbackURL(config);
     await flush();
 
     assert.equal(element._feedbackURL, url);
diff --git a/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts b/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts
index f2ee838..632ce4c 100644
--- a/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts
+++ b/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts
@@ -249,7 +249,7 @@
 
 export interface GenerateUrlChangeViewParameters {
   view: GerritView.CHANGE;
-  // TODO(TS): NumericChangeId - not sure about it, may be it can be removeds
+  // TODO(TS): NumericChangeId - not sure about it, may be it can be removed
   changeNum: NumericChangeId;
   project: RepoName;
   patchNum?: PatchSetNum;
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 468bb97..e381213 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
@@ -100,7 +100,7 @@
 
   private refitOverlay?: () => void;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   /**
    * Given robot comment CustomEvent object, fetch diffs associated
diff --git a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts
index 19f43c2..b60a585 100644
--- a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts
+++ b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts
@@ -611,7 +611,7 @@
 
   private readonly flagsService = appContext.flagsService;
 
-  private _isPortingCommentsExperimentEnabled = false;
+  private isPortingCommentsExperimentEnabled = false;
 
   /** @override */
   created() {
@@ -620,7 +620,7 @@
 
   constructor() {
     super();
-    this._isPortingCommentsExperimentEnabled = this.flagsService.isEnabled(
+    this.isPortingCommentsExperimentEnabled = this.flagsService.isEnabled(
       KnownExperimentId.PORTING_COMMENTS
     );
   }
@@ -636,10 +636,10 @@
       this.restApiService.getDiffComments(changeNum),
       this.restApiService.getDiffRobotComments(changeNum),
       this.restApiService.getDiffDrafts(changeNum),
-      this._isPortingCommentsExperimentEnabled
+      this.isPortingCommentsExperimentEnabled
         ? this.restApiService.getPortedComments(changeNum, revision)
         : Promise.resolve({}),
-      this._isPortingCommentsExperimentEnabled
+      this.isPortingCommentsExperimentEnabled
         ? this.restApiService.getPortedDrafts(changeNum, revision)
         : Promise.resolve({}),
     ];
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
index da1b928..4943298 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
@@ -33,7 +33,7 @@
 
 /**
  * In JS, unicode code points above 0xFFFF occupy two elements of a string.
- * For example '𐀏'.length is 2. An occurence of such a code point is called a
+ * For example '𐀏'.length is 2. An occurrence of such a code point is called a
  * surrogate pair.
  *
  * This regex segments a string along tabs ('\t') and surrogate pairs, since
@@ -80,7 +80,7 @@
 
   readonly groups: GrDiffGroup[];
 
-  private _blameInfo: BlameInfo[] | null;
+  private blameInfo: BlameInfo[] | null;
 
   private readonly _layerUpdateListener: (
     start: LineNumber,
@@ -104,7 +104,7 @@
     this._prefs = prefs;
     this._outputEl = outputEl;
     this.groups = [];
-    this._blameInfo = null;
+    this.blameInfo = null;
 
     if (isNaN(prefs.tab_size) || prefs.tab_size <= 0) {
       throw Error('Invalid tab size from preferences.');
@@ -765,7 +765,7 @@
    * re-render its blame cell content.
    */
   setBlame(blame: BlameInfo[] | null) {
-    this._blameInfo = blame;
+    this.blameInfo = blame;
     if (!blame) return;
 
     // TODO(wyatta): make this loop asynchronous.
@@ -890,11 +890,11 @@
    * @return The commit information.
    */
   _getBlameCommitForBaseLine(lineNum: LineNumber) {
-    if (!this._blameInfo) {
+    if (!this.blameInfo) {
       return null;
     }
 
-    for (const blameCommit of this._blameInfo) {
+    for (const blameCommit of this.blameInfo) {
       for (const range of blameCommit.ranges) {
         if (range.start <= lineNum && range.end >= lineNum) {
           return blameCommit;
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.ts b/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.ts
index 5ac37dc..cc3be07 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.ts
@@ -61,7 +61,7 @@
     return htmlTemplate;
   }
 
-  private _preventAutoScrollOnManualScroll = false;
+  private preventAutoScrollOnManualScroll = false;
 
   private lastDisplayedNavigateToNextFileToast: number | null = null;
 
@@ -338,10 +338,10 @@
   }
 
   private _boundHandleWindowScroll = () => {
-    if (this._preventAutoScrollOnManualScroll) {
+    if (this.preventAutoScrollOnManualScroll) {
       this._scrollMode = ScrollMode.NEVER;
       this._focusOnMove = false;
-      this._preventAutoScrollOnManualScroll = false;
+      this.preventAutoScrollOnManualScroll = false;
     }
   };
 
@@ -360,14 +360,14 @@
   };
 
   private _boundHandleDiffRenderStart = () => {
-    this._preventAutoScrollOnManualScroll = true;
+    this.preventAutoScrollOnManualScroll = true;
   };
 
   private _boundHandleDiffRenderContent = () => {
     this._updateStops();
     // When done rendering, turn focus on move and automatic scrolling back on
     this._focusOnMove = true;
-    this._preventAutoScrollOnManualScroll = false;
+    this.preventAutoScrollOnManualScroll = false;
   };
 
   private _boundHandleDiffLineSelected = (event: Event) => {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts
index cfe2cfe..60f2853 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts
@@ -60,17 +60,17 @@
       this.restApiService.savePreferences({diff_view: newMode});
     }
     this.mode = newMode;
-    let annoucement;
+    let announcement;
     if (this.isUnifiedSelected(newMode)) {
-      annoucement = 'Changed diff view to unified';
+      announcement = 'Changed diff view to unified';
     } else if (this.isSideBySideSelected(newMode)) {
-      annoucement = 'Changed diff view to side by side';
+      announcement = 'Changed diff view to side by side';
     }
-    if (annoucement) {
+    if (announcement) {
       this.fire(
         'iron-announce',
         {
-          text: annoucement,
+          text: announcement,
         },
         {bubbles: true}
       );
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 088d9cf..2c4b8f6 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
@@ -1465,9 +1465,9 @@
   ) {
     let patchNum = patchRange.patchNum;
 
-    const comparedAgainsParent = patchRange.basePatchNum === 'PARENT';
+    const comparedAgainstParent = patchRange.basePatchNum === 'PARENT';
 
-    if (isBase && !comparedAgainsParent) {
+    if (isBase && !comparedAgainstParent) {
       patchNum = patchRange.basePatchNum;
     }
 
@@ -1475,7 +1475,7 @@
       changeBaseURL(project, changeNum, patchNum) +
       `/files/${encodeURIComponent(path)}/download`;
 
-    if (isBase && comparedAgainsParent) {
+    if (isBase && comparedAgainstParent) {
       url += '?parent=1';
     }
 
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 5edd353..0ca929a 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
@@ -40,7 +40,7 @@
 }
 
 export function isLongCommentRange(range: CommentRange): boolean {
-  return range.end_line - range.start_line > 5;
+  return range.end_line - range.start_line > 10;
 }
 
 export function getLineNumber(lineEl?: Element | null): LineNumber | null {
@@ -88,7 +88,7 @@
 // TODO: This type should be exposed to gr-diff clients in a separate type file.
 // For Gerrit these are instances of GrCommentThread, but other gr-diff users
 // have different HTML elements in use for comment threads.
-// TODO: Also document the required HTML attritbutes that thread elements must
+// TODO: Also document the required HTML attributes that thread elements must
 // have, e.g. 'diff-side', 'range', 'line-num', 'data-value'.
 export interface GrDiffThreadElement extends HTMLElement {
   rootId: string;
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_test.js b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_test.js
index 6fef223..49eac72 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_test.js
@@ -558,7 +558,7 @@
     test('adds long range comment chip', async () => {
       const range = {
         start_line: 1,
-        end_line: 7,
+        end_line: 12,
         start_character: 0,
         end_character: 0,
       };
@@ -572,7 +572,7 @@
         a: [],
         b: [],
       }, {
-        ab: Array(8).fill('text'),
+        ab: Array(13).fill('text'),
       }];
       setupSampleDiff({content});
 
@@ -586,7 +586,7 @@
     test('no duplicate range chip for same thread', async () => {
       const range = {
         start_line: 1,
-        end_line: 7,
+        end_line: 12,
         start_character: 0,
         end_character: 0,
       };
@@ -604,7 +604,7 @@
         a: [],
         b: [],
       }, {
-        ab: Array(8).fill('text'),
+        ab: Array(13).fill('text'),
       }];
       setupSampleDiff({content});
 
diff --git a/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_test.js b/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_test.js
index fad717d..8279ab1 100644
--- a/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer_test.js
@@ -72,7 +72,7 @@
         side: 'right',
         range: {
           end_character: 1,
-          end_line: 70,
+          end_line: 71,
           start_character: 1,
           start_line: 60,
         },
@@ -314,10 +314,10 @@
     assert.equal(element._rangesMap.left[39][0].start, 0);
     assert.equal(element._rangesMap.left[39][0].end, 9);
 
-    // The right has four ranged comments: 10-12, 55-55, 60-70, 100-100
+    // The right has four ranged comments: 10-12, 55-55, 60-71, 100-100
     const rightKeys = [];
     for (let i = 10; i <= 12; i++) { rightKeys.push('' + i); }
-    for (let i = 60; i <= 70; i++) { rightKeys.push('' + i); }
+    for (let i = 60; i <= 71; i++) { rightKeys.push('' + i); }
     rightKeys.push('55', '100');
     assert.deepEqual(Object.keys(element._rangesMap.right).sort(),
         rightKeys.sort());
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 f38824f..ee52ab6 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
@@ -23,7 +23,6 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-selection-action-box_html';
 import {fireEvent} from '../../../utils/event-util';
-import {appContext} from '../../../services/app-context';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -57,11 +56,6 @@
   @property({type: Boolean})
   positionBelow = false;
 
-  @property({type: Boolean})
-  disableKeyboardShortcuts = false;
-
-  private restApiService = appContext.restApiService;
-
   /** @override */
   created() {
     super.created();
@@ -70,18 +64,6 @@
     this.addEventListener('mousedown', e => this._handleMouseDown(e));
   }
 
-  attached() {
-    this.restApiService.getPreferences().then(prefs => {
-      if (prefs?.disable_keyboard_shortcuts) {
-        this.disableKeyboardShortcuts = true;
-      }
-    });
-  }
-
-  _getTextForTooltip(disableKeyboardShortcuts: boolean) {
-    return disableKeyboardShortcuts ? 'Click to comment' : 'Press c to comment';
-  }
-
   placeAbove(el: Text | Element | Range) {
     flush();
     const rect = this._getTargetBoundingRect(el);
diff --git a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
index d293967..24d63b3 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
@@ -27,7 +27,7 @@
   </style>
   <gr-tooltip
     id="tooltip"
-    text="[[_getTextForTooltip(disableKeyboardShortcuts)]]"
+    text="Press c to comment"
     position-below="[[positionBelow]]"
   ></gr-tooltip>
 `;
diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts
index da29b85..1150674 100644
--- a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts
@@ -492,7 +492,7 @@
    * with code it shouldn't AND to avoid executing regexes as much as
    * possible.
    * * These tests should document the issue clearly enough that the test can
-   * be condidently removed when the issue is solved in HLJS.
+   * be confidently removed when the issue is solved in HLJS.
    * * These tests should rewrite the line of code to have the same number of
    * characters. This method rewrites the string that gets parsed, but NOT
    * the string that gets displayed and highlighted. Thus, the positions
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 b36edd4..bc153ee 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
@@ -277,7 +277,8 @@
     return this.restApiService
       .queryChangeFiles(this.change._number, this.patchNum, input)
       .then(res => {
-        if (!res) throw new Error('Failed to retrieve files. Reponse not set.');
+        if (!res)
+          throw new Error('Failed to retrieve files. Response not set.');
         return res.map(file => {
           return {name: file};
         });
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.js b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.js
index be6ffc4..bbf4790 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls_test.js
@@ -50,14 +50,14 @@
 
   suite('edit button CUJ', () => {
     let navStubs;
-    let openAutoCcmplete;
+    let openAutoComplete;
 
     setup(() => {
       navStubs = [
         sinon.stub(GerritNav, 'getEditUrlForDiff'),
         sinon.stub(GerritNav, 'navigateToRelativeUrl'),
       ];
-      openAutoCcmplete = element.$.openDialog.querySelector('gr-autocomplete');
+      openAutoComplete = element.$.openDialog.querySelector('gr-autocomplete');
     });
 
     test('_isValidPath', () => {
@@ -77,9 +77,9 @@
         assert.isFalse(queryStub.called);
         // Setup _focused manually - in headless mode Chrome sometimes don't
         // setup focus. flush and/or flushAsynchronousOperations don't help
-        openAutoCcmplete._focused = true;
-        openAutoCcmplete.noDebounce = true;
-        openAutoCcmplete.text = 'src/test.cpp';
+        openAutoComplete._focused = true;
+        openAutoComplete.noDebounce = true;
+        openAutoComplete.text = 'src/test.cpp';
         assert.isTrue(queryStub.called);
         assert.isFalse(element.$.openDialog.disabled);
         MockInteractions.tap(element.$.openDialog.shadowRoot
@@ -95,8 +95,8 @@
       MockInteractions.tap(element.shadowRoot.querySelector('#open'));
       return showDialogSpy.lastCall.returnValue.then(() => {
         assert.isTrue(element.$.openDialog.disabled);
-        openAutoCcmplete.noDebounce = true;
-        openAutoCcmplete.text = 'src/test.cpp';
+        openAutoComplete.noDebounce = true;
+        openAutoComplete.text = 'src/test.cpp';
         assert.isFalse(element.$.openDialog.disabled);
         MockInteractions.tap(element.$.openDialog.shadowRoot
             .querySelector('gr-button'));
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 1864598..1e08a5c 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
@@ -200,7 +200,7 @@
   }
 
   _handlePathChanged(e: CustomEvent<string>) {
-    // TODO(TS) could be cleand up, it was added for type requirements
+    // TODO(TS) could be cleaned up, it was added for type requirements
     if (this._changeNum === undefined || !this._path) {
       return Promise.reject(new Error('changeNum or path undefined'));
     }
diff --git a/polygerrit-ui/app/elements/gr-app-element.ts b/polygerrit-ui/app/elements/gr-app-element.ts
index e4d72e1..ec3bd0f 100644
--- a/polygerrit-ui/app/elements/gr-app-element.ts
+++ b/polygerrit-ui/app/elements/gr-app-element.ts
@@ -206,7 +206,7 @@
 
   private reporting = appContext.reportingService;
 
-  private restApiService = appContext.restApiService;
+  private readonly restApiService = appContext.restApiService;
 
   keyboardShortcuts() {
     return {
diff --git a/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper_test.js b/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper_test.js
index ea7bdc3..7ea3be3 100644
--- a/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper_test.js
+++ b/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper_test.js
@@ -20,7 +20,7 @@
 import {GrAttributeHelper} from './gr-attribute-helper.js';
 
 Polymer({
-  is: 'gr-attrubute-helper-some-element',
+  is: 'gr-attribute-helper-some-element',
   properties: {
     fooBar: {
       type: Object,
@@ -29,7 +29,7 @@
   },
 });
 
-const basicFixture = fixtureFromElement('gr-attrubute-helper-some-element');
+const basicFixture = fixtureFromElement('gr-attribute-helper-some-element');
 
 suite('gr-attribute-helper tests', () => {
   let element;
diff --git a/polygerrit-ui/app/elements/plugins/gr-change-metadata-api/gr-change-metadata-api.ts b/polygerrit-ui/app/elements/plugins/gr-change-metadata-api/gr-change-metadata-api.ts
index 3a61bce..a03c5dc 100644
--- a/polygerrit-ui/app/elements/plugins/gr-change-metadata-api/gr-change-metadata-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-change-metadata-api/gr-change-metadata-api.ts
@@ -19,24 +19,24 @@
 import {HookApi} from '../../../api/hook';
 
 export class GrChangeMetadataApi implements ChangeMetadataPluginApi {
-  private _hook: HookApi | null;
+  private hook: HookApi | null;
 
   public plugin: PluginApi;
 
   constructor(plugin: PluginApi) {
     this.plugin = plugin;
-    this._hook = null;
+    this.hook = null;
   }
 
   _createHook() {
-    this._hook = this.plugin.hook('change-metadata-item');
+    this.hook = this.plugin.hook('change-metadata-item');
   }
 
   onLabelsChanged(callback: (value: unknown) => void) {
-    if (!this._hook) {
+    if (!this.hook) {
       this._createHook();
     }
-    this._hook!.onAttached((element: Element) =>
+    this.hook!.onAttached((element: Element) =>
       this.plugin.attributeHelper(element).bind('labels', callback)
     );
     return this;
diff --git a/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.ts b/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.ts
index d2568ad..3e8f0a4 100644
--- a/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.ts
@@ -19,13 +19,13 @@
 import {HookApi, HookCallback} from '../../../api/hook';
 
 export class GrDomHooksManager {
-  private _hooks: Record<string, GrDomHook>;
+  private hooks: Record<string, GrDomHook>;
 
-  private _plugin: PluginApi;
+  private plugin: PluginApi;
 
   constructor(plugin: PluginApi) {
-    this._plugin = plugin;
-    this._hooks = {};
+    this.plugin = plugin;
+    this.hooks = {};
   }
 
   _getHookName(endpointName: string, moduleName?: string) {
@@ -36,37 +36,36 @@
       // TODO: this still can not prevent if plugin has invalid char
       // other than uppercase, but is the first step
       // https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
-      const pluginName: string =
-        this._plugin.getPluginName() || 'unknown_plugin';
+      const pluginName: string = this.plugin.getPluginName() || 'unknownplugin';
       return pluginName.toLowerCase() + '-autogenerated-' + endpointName;
     }
   }
 
   getDomHook(endpointName: string, moduleName?: string) {
     const hookName = this._getHookName(endpointName, moduleName);
-    if (!this._hooks[hookName]) {
-      this._hooks[hookName] = new GrDomHook(hookName, moduleName);
+    if (!this.hooks[hookName]) {
+      this.hooks[hookName] = new GrDomHook(hookName, moduleName);
     }
-    return this._hooks[hookName];
+    return this.hooks[hookName];
   }
 }
 
 export class GrDomHook implements HookApi {
-  private _instances: HTMLElement[] = [];
+  private instances: HTMLElement[] = [];
 
-  private _attachCallbacks: HookCallback[] = [];
+  private attachCallbacks: HookCallback[] = [];
 
-  private _detachCallbacks: HookCallback[] = [];
+  private detachCallbacks: HookCallback[] = [];
 
-  private _moduleName: string;
+  private moduleName: string;
 
-  private _lastAttachedPromise: Promise<HTMLElement> | null = null;
+  private lastAttachedPromise: Promise<HTMLElement> | null = null;
 
   constructor(hookName: string, moduleName?: string) {
     if (moduleName) {
-      this._moduleName = moduleName;
+      this.moduleName = moduleName;
     } else {
-      this._moduleName = hookName;
+      this.moduleName = hookName;
       this._createPlaceholder(hookName);
     }
   }
@@ -89,16 +88,16 @@
   }
 
   handleInstanceDetached(instance: HTMLElement) {
-    const index = this._instances.indexOf(instance);
+    const index = this.instances.indexOf(instance);
     if (index !== -1) {
-      this._instances.splice(index, 1);
+      this.instances.splice(index, 1);
     }
-    this._detachCallbacks.forEach(callback => callback(instance));
+    this.detachCallbacks.forEach(callback => callback(instance));
   }
 
   handleInstanceAttached(instance: HTMLElement) {
-    this._instances.push(instance);
-    this._attachCallbacks.forEach(callback => callback(instance));
+    this.instances.push(instance);
+    this.attachCallbacks.forEach(callback => callback(instance));
   }
 
   /**
@@ -106,32 +105,32 @@
    * Returns a Promise, that's resolved when attachment is done.
    */
   getLastAttached(): Promise<HTMLElement> {
-    if (this._instances.length) {
-      return Promise.resolve(this._instances.slice(-1)[0]);
+    if (this.instances.length) {
+      return Promise.resolve(this.instances.slice(-1)[0]);
     }
-    if (!this._lastAttachedPromise) {
+    if (!this.lastAttachedPromise) {
       let resolve: HookCallback;
       const promise = new Promise<HTMLElement>(r => {
         resolve = r;
-        this._attachCallbacks.push(resolve);
+        this.attachCallbacks.push(resolve);
       });
-      this._lastAttachedPromise = promise.then((element: HTMLElement) => {
-        this._lastAttachedPromise = null;
-        const index = this._attachCallbacks.indexOf(resolve);
+      this.lastAttachedPromise = promise.then((element: HTMLElement) => {
+        this.lastAttachedPromise = null;
+        const index = this.attachCallbacks.indexOf(resolve);
         if (index !== -1) {
-          this._attachCallbacks.splice(index, 1);
+          this.attachCallbacks.splice(index, 1);
         }
         return element;
       });
     }
-    return this._lastAttachedPromise;
+    return this.lastAttachedPromise;
   }
 
   /**
    * Get all DOM hook elements.
    */
   getAllAttached() {
-    return this._instances;
+    return this.instances;
   }
 
   /**
@@ -139,7 +138,7 @@
    * is attached.
    */
   onAttached(callback: HookCallback) {
-    this._attachCallbacks.push(callback);
+    this.attachCallbacks.push(callback);
     return this;
   }
 
@@ -149,7 +148,7 @@
    *
    */
   onDetached(callback: HookCallback) {
-    this._detachCallbacks.push(callback);
+    this.detachCallbacks.push(callback);
     return this;
   }
 
@@ -157,6 +156,6 @@
    * Name of DOM hook element that will be installed into the endpoint.
    */
   getModuleName() {
-    return this._moduleName;
+    return this.moduleName;
   }
 }
diff --git a/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks_test.js b/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks_test.js
index 49223b9..883f2a6 100644
--- a/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks_test.js
+++ b/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks_test.js
@@ -45,7 +45,7 @@
     });
 
     test('getModuleName()', () => {
-      const hookName = Object.keys(instance._hooks).pop();
+      const hookName = Object.keys(instance.hooks).pop();
       assert.equal(hookName, 'testplugin-autogenerated-foo-bar');
       assert.equal(hook.getModuleName(), 'testplugin-autogenerated-foo-bar');
     });
@@ -57,7 +57,7 @@
     });
 
     test('getModuleName()', () => {
-      const hookName = Object.keys(instance._hooks).pop();
+      const hookName = Object.keys(instance.hooks).pop();
       assert.equal(hookName, 'foo-bar my-el');
       assert.equal(hook.getModuleName(), 'my-el');
     });
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 07d11ec..dcabc80 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
@@ -27,23 +27,23 @@
 /**
  * Plugin popup API.
  * Provides method for opening and closing popups from plugin.
- * opt_moduleName is a name of custom element that will be automatically
+ * optmoduleName is a name of custom element that will be automatically
  * inserted on popup opening.
  */
 export class GrPopupInterface implements PopupPluginApi {
-  private _openingPromise: Promise<GrPopupInterface> | null = null;
+  private openingPromise: Promise<GrPopupInterface> | null = null;
 
-  private _popup: GrPluginPopup | null = null;
+  private popup: GrPluginPopup | null = null;
 
   constructor(
     readonly plugin: PluginApi,
-    private _moduleName: string | null = null
+    private moduleName: string | null = null
   ) {}
 
   _getElement() {
     // TODO(TS): maybe consider removing this if no one is using
     // anything other than native methods on the return
-    return (dom(this._popup) as unknown) as HTMLElement;
+    return (dom(this.popup) as unknown) as HTMLElement;
   }
 
   /**
@@ -52,34 +52,34 @@
    * if it was provided with constructor.
    */
   open(): Promise<PopupPluginApi> {
-    if (!this._openingPromise) {
-      this._openingPromise = this.plugin
+    if (!this.openingPromise) {
+      this.openingPromise = this.plugin
         .hook('plugin-overlay')
         .getLastAttached()
         .then(hookEl => {
           const popup = document.createElement('gr-plugin-popup');
-          if (this._moduleName) {
+          if (this.moduleName) {
             const el = popup.appendChild(
-              document.createElement(this._moduleName) as CustomPolymerPluginEl
+              document.createElement(this.moduleName) as CustomPolymerPluginEl
             );
             el.plugin = this.plugin;
           }
-          this._popup = hookEl.appendChild(popup);
+          this.popup = hookEl.appendChild(popup);
           flush();
-          return this._popup.open().then(() => this);
+          return this.popup.open().then(() => this);
         });
     }
-    return this._openingPromise;
+    return this.openingPromise;
   }
 
   /**
    * Hides the popup.
    */
   close() {
-    if (!this._popup) {
+    if (!this.popup) {
       return;
     }
-    this._popup.close();
-    this._openingPromise = null;
+    this.popup.close();
+    this.openingPromise = null;
   }
 }
diff --git a/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-repo-api.ts b/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-repo-api.ts
index e42ca08..0418edb 100644
--- a/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-repo-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-repo-api.ts
@@ -29,7 +29,7 @@
 }
 
 export class GrRepoApi implements RepoPluginApi {
-  private _hook?: HookApi;
+  private hook?: HookApi;
 
   constructor(readonly plugin: PluginApi) {}
 
@@ -43,12 +43,12 @@
   }
 
   createCommand(title: string, callback: RepoCommandCallback) {
-    if (this._hook) {
+    if (this.hook) {
       console.warn('Already set up.');
       return this;
     }
-    this._hook = this._createHook(title);
-    this._hook.onAttached(element => {
+    this.hook = this._createHook(title);
+    this.hook.onAttached(element => {
       if (callback(element.repoName, element.config) === false) {
         element.hidden = true;
       }
@@ -57,11 +57,11 @@
   }
 
   onTap(callback: (event: Event) => boolean) {
-    if (!this._hook) {
+    if (!this.hook) {
       console.warn('Call createCommand first.');
       return this;
     }
-    this._hook.onAttached(element => {
+    this.hook.onAttached(element => {
       this.plugin.eventHelper(element).on('command-tap', callback);
     });
     return this;
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 3c00a47..809139d 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
@@ -76,7 +76,6 @@
   'email_strategy',
   'diff_view',
   'publish_comments_on_push',
-  'disable_keyboard_shortcuts',
   'work_in_progress_by_default',
   'default_base_for_merges',
   'signed_off_by',
@@ -115,7 +114,6 @@
     workInProgressByDefault: HTMLInputElement;
     showSizeBarsInFileList: HTMLInputElement;
     publishCommentsOnPush: HTMLInputElement;
-    disableKeyboardShortcuts: HTMLInputElement;
     relativeDateInChangeTable: HTMLInputElement;
   };
 }
@@ -386,13 +384,6 @@
     );
   }
 
-  _handleDisableKeyboardShortcutsChanged() {
-    this.set(
-      '_localPrefs.disable_keyboard_shortcuts',
-      this.$.disableKeyboardShortcuts.checked
-    );
-  }
-
   _handleWorkInProgressByDefault() {
     this.set(
       '_localPrefs.work_in_progress_by_default',
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
index b141a86..11372a1 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
@@ -278,19 +278,6 @@
           </span>
         </section>
         <section>
-          <label for="disableKeyboardShortcuts" class="title"
-            >Disable all keyboard shortcuts</label
-          >
-          <span class="value">
-            <input
-              id="disableKeyboardShortcuts"
-              type="checkbox"
-              checked$="[[_localPrefs.disable_keyboard_shortcuts]]"
-              on-change="_handleDisableKeyboardShortcutsChanged"
-            />
-          </span>
-        </section>
-        <section>
           <label for="insertSignedOff" class="title">
             Insert Signed-off-by Footer For Inline Edit Changes
           </label>
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 7a6ce2c..60b891e 100644
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
+++ b/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
@@ -61,7 +61,7 @@
   tooltip = '';
 
   // Note: don't assign a value to this, since constructor is called
-  // after created, the initial value maybe overriden by this
+  // after created, the initial value maybe overridden by this
   @property({type: String})
   _initialTabindex?: string;
 
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 76bbd67..55408c0 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
@@ -23,12 +23,12 @@
       font-size: var(--font-size-normal);
       font-weight: var(--font-weight-normal);
       line-height: var(--line-height-normal);
-      /* Explicitly set the background color of the diff to be white. We
+      /* Explicitly set the background color of the diff. We
        * cannot use the diff content type ab because of the skip chunk preceding
        * it, diff processor assumes the chunk of type skip/ab can be collapsed
        * and hides our diff behind context control buttons.
        *  */
-      --dark-add-highlight-color: white;
+      --dark-add-highlight-color: var(--background-color-primary);
     }
     gr-button {
       margin-left: var(--spacing-m);
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 2fbbd7c..119ed20 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
@@ -54,8 +54,8 @@
 export type Stop = HTMLElement | AbortStop;
 
 /**
- * Type guard and checker to check if a stop can be targetted.
- * Abort stops cannot be targetted.
+ * Type guard and checker to check if a stop can be targeted.
+ * Abort stops cannot be targeted.
  */
 export function isTargetable(stop: Stop): stop is HTMLElement {
   return !(stop instanceof AbortStop);
diff --git a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts
index d2f003b..4c2a417 100644
--- a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts
+++ b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts
@@ -52,7 +52,7 @@
 
   // TODO(TS): maybe default to [] as only used in dom-repeat
   @property({type: Array})
-  comamnds?: Command[];
+  commands?: Command[];
 
   @property({type: Boolean})
   _loggedIn = false;
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 3fce16e..888f34f 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
@@ -32,7 +32,7 @@
 import {NormalizedFileInfo} from '../../change/gr-file-list/gr-file-list';
 
 /**
- * Requred values are text and value. mobileText and triggerText will
+ * Required values are text and value. mobileText and triggerText will
  * fall back to text if not provided.
  *
  * If bottomText is not provided, nothing will display on the second
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
index e67e1f6..b8f0161 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard-behavior.ts
@@ -110,13 +110,13 @@
       @property({type: String})
       containerId = 'gr-hovercard-container';
 
-      private _hideDebouncer: Debouncer | null = null;
+      private hideDebouncer: Debouncer | null = null;
 
-      private _showDebouncer: Debouncer | null = null;
+      private showDebouncer: Debouncer | null = null;
 
-      private _isScheduledToShow?: boolean;
+      private isScheduledToShow?: boolean;
 
-      private _isScheduledToHide?: boolean;
+      private isScheduledToHide?: boolean;
 
       /** @override */
       attached() {
@@ -174,24 +174,24 @@
 
       debounceHide() {
         this.cancelShowDebouncer();
-        if (!this._isShowing || this._isScheduledToHide) return;
-        this._isScheduledToHide = true;
-        this._hideDebouncer = Debouncer.debounce(
-          this._hideDebouncer,
+        if (!this._isShowing || this.isScheduledToHide) return;
+        this.isScheduledToHide = true;
+        this.hideDebouncer = Debouncer.debounce(
+          this.hideDebouncer,
           timeOut.after(HIDE_DELAY_MS),
           () => {
             // This happens when hide immediately through click or mouse leave
             // on the hovercard
-            if (!this._isScheduledToHide) return;
+            if (!this.isScheduledToHide) return;
             this.hide();
           }
         );
       }
 
       cancelHideDebouncer() {
-        if (this._hideDebouncer) {
-          this._hideDebouncer.cancel();
-          this._isScheduledToHide = false;
+        if (this.hideDebouncer) {
+          this.hideDebouncer.cancel();
+          this.isScheduledToHide = false;
         }
       }
 
@@ -305,23 +305,23 @@
        */
       debounceShowBy(delayMs: number) {
         this.cancelHideDebouncer();
-        if (this._isShowing || this._isScheduledToShow) return;
-        this._isScheduledToShow = true;
-        this._showDebouncer = Debouncer.debounce(
-          this._showDebouncer,
+        if (this._isShowing || this.isScheduledToShow) return;
+        this.isScheduledToShow = true;
+        this.showDebouncer = Debouncer.debounce(
+          this.showDebouncer,
           timeOut.after(delayMs),
           () => {
             // This happens when the mouse leaves the target before the delay is over.
-            if (!this._isScheduledToShow) return;
+            if (!this.isScheduledToShow) return;
             this.show();
           }
         );
       }
 
       cancelShowDebouncer() {
-        if (this._showDebouncer) {
-          this._showDebouncer.cancel();
-          this._isScheduledToShow = false;
+        if (this.showDebouncer) {
+          this.showDebouncer.cancel();
+          this.isScheduledToShow = false;
         }
       }
 
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
index 6b2e620..628b1e9 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard_test.js
@@ -120,18 +120,18 @@
     button.dispatchEvent(new CustomEvent('mouseenter'));
 
     await enterPromise;
-    assert.isTrue(element._isScheduledToShow);
-    element._showDebouncer.flush();
+    assert.isTrue(element.isScheduledToShow);
+    element.showDebouncer.flush();
     assert.isTrue(element._isShowing);
-    assert.isFalse(element._isScheduledToShow);
+    assert.isFalse(element.isScheduledToShow);
 
     button.dispatchEvent(new CustomEvent('mouseleave'));
 
     await leavePromise;
-    assert.isTrue(element._isScheduledToHide);
+    assert.isTrue(element.isScheduledToHide);
     assert.isTrue(element._isShowing);
-    element._hideDebouncer.flush();
-    assert.isFalse(element._isScheduledToShow);
+    element.hideDebouncer.flush();
+    assert.isFalse(element.isScheduledToShow);
     assert.isFalse(element._isShowing);
 
     button.removeEventListener('mouseenter', enterResolve);
@@ -152,11 +152,11 @@
     button.dispatchEvent(new CustomEvent('mouseenter'));
 
     await enterPromise;
-    assert.isTrue(element._isScheduledToShow);
+    assert.isTrue(element.isScheduledToShow);
     MockInteractions.tap(button);
 
     await clickPromise;
-    assert.isFalse(element._isScheduledToShow);
+    assert.isFalse(element.isScheduledToShow);
     assert.isFalse(element._isShowing);
 
     button.removeEventListener('mouseenter', enterResolve);
diff --git a/polygerrit-ui/app/elements/shared/gr-icons/gr-icons.ts b/polygerrit-ui/app/elements/shared/gr-icons/gr-icons.ts
index 0a3ef5b..7745da8 100644
--- a/polygerrit-ui/app/elements/shared/gr-icons/gr-icons.ts
+++ b/polygerrit-ui/app/elements/shared/gr-icons/gr-icons.ts
@@ -128,6 +128,8 @@
       <g id="message"><path d="M0 0h24v24H0z" fill="none"/><path d="M20 2H4c-1.1 0-1.99.9-1.99 2L2 22l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm-2 12H6v-2h12v2zm0-3H6V9h12v2zm0-3H6V6h12v2z"/></g>
       <!-- This SVG is a copy from material.io https://material.io/icons/#launch-->
       <g id="launch"><path d="M0 0h24v24H0z" fill="none"/><path d="M19 19H5V5h7V3H5c-1.11 0-2 .9-2 2v14c0 1.1.89 2 2 2h14c1.1 0 2-.9 2-2v-7h-2v7zM14 3v2h3.59l-9.83 9.83 1.41 1.41L19 6.41V10h2V3h-7z"/></g>
+      <!-- This SVG is a copy from material.io https://material.io/icons/#filter-->
+      <g id="filter"><path d="M0,0h24 M24,24H0" fill="none"/><path d="M4.25,5.61C6.27,8.2,10,13,10,13v6c0,0.55,0.45,1,1,1h2c0.55,0,1-0.45,1-1v-6c0,0,3.72-4.8,5.74-7.39 C20.25,4.95,19.78,4,18.95,4H5.04C4.21,4,3.74,4.95,4.25,5.61z"/><path d="M0,0h24v24H0V0z" fill="none"/></g>
       <!-- This is just a placeholder, i.e. an empty icon that has the same size as a normal icon. -->
       <g id="placeholder"><path d="M0 0h24v24H0z" fill="none"/></g>
     </defs>
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
index 95252cf..a3d038d 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
@@ -120,12 +120,8 @@
    * Don't forget to also call disposeLayer().
    */
   createLayer(path: string, changeNum: number) {
-    if (!this.annotationCallback) return undefined;
-    const annotationLayer = new AnnotationLayer(
-      path,
-      changeNum,
-      this.annotationCallback
-    );
+    const callbackFn = this.annotationCallback || (() => {});
+    const annotationLayer = new AnnotationLayer(path, changeNum, callbackFn);
     this.annotationLayers.push(annotationLayer);
     return annotationLayer;
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts
index 2f2b5ce..a4c6974 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts
@@ -60,7 +60,7 @@
 }
 
 export class GrChangeActionsInterface implements ChangeActionsPluginApi {
-  private _el?: GrChangeActionsElement;
+  private el?: GrChangeActionsElement;
 
   RevisionActions = RevisionActions;
 
@@ -80,7 +80,7 @@
       console.warn('changeActions() is not ready');
       return;
     }
-    this._el = el;
+    this.el = el;
   }
 
   /**
@@ -88,7 +88,7 @@
    * element and retrieve if the interface was created before element.
    */
   private ensureEl(): GrChangeActionsElement {
-    if (!this._el) {
+    if (!this.el) {
       const sharedApiElement = appContext.jsApiService;
       this.setEl(
         (sharedApiElement.getElement(
@@ -96,7 +96,7 @@
         ) as unknown) as GrChangeActionsElement
       );
     }
-    return this._el!;
+    return this.el!;
   }
 
   addPrimaryActionKey(key: PrimaryActionKey) {
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 27bc591..7f9218a 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
@@ -250,7 +250,7 @@
    *   });
    * });
    *
-   * // Listen on your-special-event from pluignB
+   * // Listen on your-special-event from pluginB
    * Gerrit.install(pluginB => {
    *   Gerrit.on("your-special-event", ({plugin}) => {
    *     // do something, plugin is pluginA
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js
index 6a8a0dd..12a4056 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js
@@ -426,7 +426,7 @@
             // eslint-disable-next-line no-invalid-this
             const grPopupInterface = this;
             assert.equal(grPopupInterface.plugin, plugin);
-            assert.equal(grPopupInterface._moduleName, 'some-name');
+            assert.equal(grPopupInterface.moduleName, 'some-name');
           });
       plugin.popup('some-name');
       assert.isTrue(openStub.calledOnce);
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts
index 21e4876..2135c30 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts
@@ -28,7 +28,7 @@
 }
 
 export class GrPluginActionContext {
-  private _popups: PopupPluginApi[] = [];
+  private popups: PopupPluginApi[] = [];
 
   constructor(
     public readonly plugin: PluginApi,
@@ -44,15 +44,15 @@
         throw new Error('Popup element not found');
       }
       popupEl.appendChild(element);
-      this._popups.push(popApi);
+      this.popups.push(popApi);
     });
   }
 
   hide() {
-    for (const popupApi of this._popups) {
+    for (const popupApi of this.popups) {
       popupApi.close();
     }
-    this._popups.splice(0);
+    this.popups.splice(0);
   }
 
   refresh() {
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-endpoints.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-endpoints.ts
index 2752c74..82df2fa 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-endpoints.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-endpoints.ts
@@ -51,10 +51,10 @@
 
   private readonly _importedUrls = new Set<string>();
 
-  private _pluginLoaded = false;
+  private pluginLoaded = false;
 
   setPluginsReady() {
-    this._pluginLoaded = true;
+    this.pluginLoaded = true;
   }
 
   onNewEndpoint(endpoint: string, callback: Callback) {
@@ -125,7 +125,7 @@
     // one register before plugins ready
     // the other done after, then only the later one will have the callbacks
     // invoked.
-    if (this._pluginLoaded && this._callbacks.has(endpoint)) {
+    if (this.pluginLoaded && this._callbacks.has(endpoint)) {
       this._callbacks.get(endpoint)!.forEach(callback => callback(moduleInfo));
     }
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
index 8c0fce26..db34e5a 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
@@ -74,7 +74,7 @@
 const UNKNOWN_PLUGIN_PREFIX = '__$$__';
 
 // Current API version for Plugin,
-// plugins with incompatible version will not be laoded.
+// plugins with incompatible version will not be loaded.
 const API_VERSION = '0.1';
 
 /**
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader_test.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader_test.js
index 6b62291..f5b1fca 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader_test.js
@@ -225,7 +225,7 @@
     assert.isTrue(alertStub.calledTwice);
   });
 
-  test('plugins installed failed becasue of wrong version', async () => {
+  test('plugins installed failed because of wrong version', async () => {
     const plugins = [
       'http://test.com/plugins/foo/static/test.js',
       'http://test.com/plugins/bar/static/test.js',
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts
index 45ffdcd9..e7843af 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts
@@ -78,14 +78,14 @@
 export class Plugin implements PluginApi {
   readonly _url?: URL;
 
-  private _domHooks: GrDomHooksManager;
+  private domHooks: GrDomHooksManager;
 
   private readonly _name: string = PLUGIN_NAME_NOT_SET;
 
   private readonly jsApi = appContext.jsApiService;
 
   constructor(url?: string) {
-    this._domHooks = new GrDomHooksManager(this);
+    this.domHooks = new GrDomHooksManager(this);
 
     if (!url) {
       console.warn(
@@ -151,7 +151,7 @@
     const type =
       options && options.replace ? EndpointType.REPLACE : EndpointType.DECORATE;
     const slot = (options && options.slot) || '';
-    const domHook = this._domHooks.getDomHook(endpoint, moduleName);
+    const domHook = this.domHooks.getDomHook(endpoint, moduleName);
     moduleName = moduleName || domHook.getModuleName();
     getPluginEndpoints().registerModule(this, {
       slot,
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 d29cba7..20e5296 100644
--- a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
+++ b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
@@ -56,7 +56,7 @@
    * @event fullscreen-overlay-opened
    */
 
-  private _fullScreenOpen = false;
+  private fullScreenOpen = false;
 
   private _boundHandleClose: () => void = () => super.close();
 
@@ -99,7 +99,7 @@
       super.open.apply(this);
       if (this._isMobile()) {
         fireEvent(this, 'fullscreen-overlay-opened');
-        this._fullScreenOpen = true;
+        this.fullScreenOpen = true;
       }
       this._awaitOpen(resolve, reject);
     });
@@ -112,9 +112,9 @@
   // called after iron-overlay is closed. Does not actually close the overlay
   _overlayClosed() {
     window.removeEventListener('popstate', this._boundHandleClose);
-    if (this._fullScreenOpen) {
+    if (this.fullScreenOpen) {
       fireEvent(this, 'fullscreen-overlay-closed');
-      this._fullScreenOpen = false;
+      this.fullScreenOpen = false;
     }
     if (this.returnFocusTo) {
       this.returnFocusTo.focus();
diff --git a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_test.js b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_test.js
index 4b6ae34..72c3399 100644
--- a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay_test.js
@@ -57,11 +57,11 @@
     await element.open();
 
     assert.isTrue(element._isMobile.called);
-    assert.isTrue(element._fullScreenOpen);
+    assert.isTrue(element.fullScreenOpen);
     assert.isTrue(openHandler.called);
 
     element._overlayClosed();
-    assert.isFalse(element._fullScreenOpen);
+    assert.isFalse(element.fullScreenOpen);
     assert.isTrue(closeHandler.called);
   });
 
@@ -75,11 +75,11 @@
     await element.open();
 
     assert.isTrue(element._isMobile.called);
-    assert.isFalse(element._fullScreenOpen);
+    assert.isFalse(element.fullScreenOpen);
     assert.isFalse(openHandler.called);
 
     element._overlayClosed();
-    assert.isFalse(element._fullScreenOpen);
+    assert.isFalse(element.fullScreenOpen);
     assert.isFalse(closeHandler.called);
   });
 });
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts
index fa2a28e..89abd57 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts
@@ -75,7 +75,7 @@
 export class SiteBasedCache {
   // TODO(TS): Type looks unusual. Fix it.
   // Container of per-canonical-path caches.
-  private readonly _data = new Map<
+  private readonly data = new Map<
     string | undefined,
     unknown | Map<string, ParsedJSON | null>
   >();
@@ -93,13 +93,13 @@
 
   // Returns the cache for the current canonical path.
   _cache(): Map<string, unknown> {
-    if (!this._data.has(window.CANONICAL_PATH)) {
-      this._data.set(
+    if (!this.data.has(window.CANONICAL_PATH)) {
+      this.data.set(
         window.CANONICAL_PATH,
         new Map<string, ParsedJSON | null>()
       );
     }
-    return this._data.get(window.CANONICAL_PATH) as Map<
+    return this.data.get(window.CANONICAL_PATH) as Map<
       string,
       ParsedJSON | null
     >;
@@ -140,7 +140,7 @@
         newMap.set(key, value);
       }
     }
-    this._data.set(window.CANONICAL_PATH, newMap);
+    this.data.set(window.CANONICAL_PATH, newMap);
   }
 }
 
@@ -149,25 +149,25 @@
 };
 
 export class FetchPromisesCache {
-  private _data: FetchPromisesCacheData;
+  private data: FetchPromisesCacheData;
 
   constructor() {
-    this._data = {};
+    this.data = {};
   }
 
   public testOnlyGetData() {
-    return this._data;
+    return this.data;
   }
 
   /**
    * @return true only if a value for a key sets and it is not undefined
    */
   has(key: string): boolean {
-    return !!this._data[key];
+    return !!this.data[key];
   }
 
   get(key: string) {
-    return this._data[key];
+    return this.data[key];
   }
 
   /**
@@ -175,17 +175,17 @@
    *     mark key as deleted.
    */
   set(key: string, value: Promise<ParsedJSON | undefined> | undefined) {
-    this._data[key] = value;
+    this.data[key] = value;
   }
 
   invalidatePrefix(prefix: string) {
     const newData: FetchPromisesCacheData = {};
-    Object.entries(this._data).forEach(([key, value]) => {
+    Object.entries(this.data).forEach(([key, value]) => {
       if (!key.startsWith(prefix)) {
         newData[key] = value;
       }
     });
-    this._data = newData;
+    this.data = newData;
   }
 }
 export type FetchParams = {
@@ -457,7 +457,7 @@
    * Send an XHR.
    *
    * @return Promise resolves to Response/ParsedJSON only if the request is successful
-   *     (i.e. no exception and response.ok is trsue). If response fails then
+   *     (i.e. no exception and response.ok is true). If response fails then
    *     promise resolves either to void if errFn is set or rejects if errFn
    *     is not set   */
   send(req: SendRequest): Promise<Response | ParsedJSON | undefined> {
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-reviewer-updates-parser.ts b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-reviewer-updates-parser.ts
index 1a1062c..95e06c0 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-reviewer-updates-parser.ts
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-reviewer-updates-parser.ts
@@ -81,9 +81,9 @@
   // type. This class should be refactored to avoid reassignment.
   private readonly result: ChangeInfoParserInput;
 
-  private _batch: ParserBatch | null = null;
+  private batch: ParserBatch | null = null;
 
-  private _updateItems: {[accountId: string]: UpdateItem} | null = null;
+  private updateItems: {[accountId: string]: UpdateItem} | null = null;
 
   private readonly _lastState: {[accountId: string]: ReviewerState} = {};
 
@@ -105,7 +105,7 @@
    * Is a part of _groupUpdates(). Creates a new batch of updates.
    */
   private _startBatch(update: ReviewerUpdateInfo): ParserBatch {
-    this._updateItems = {};
+    this.updateItems = {};
     return {
       author: update.updated_by,
       date: update.updated,
@@ -121,7 +121,7 @@
    */
   private _completeBatch(batch: ParserBatch) {
     const items = [];
-    for (const [accountId, item] of Object.entries(this._updateItems ?? {})) {
+    for (const [accountId, item] of Object.entries(this.updateItems ?? {})) {
       if (this._lastState[accountId] !== item.state) {
         this._lastState[accountId] = item.state;
         items.push(item);
@@ -142,27 +142,27 @@
   _groupUpdates(): ParserBatchWithNonEmptyUpdates[] {
     const updates = this.result.reviewer_updates;
     const newUpdates = updates.reduce((newUpdates, update) => {
-      if (!this._batch) {
-        this._batch = this._startBatch(update);
+      if (!this.batch) {
+        this.batch = this._startBatch(update);
       }
       const updateDate = parseDate(update.updated).getTime();
-      const batchUpdateDate = parseDate(this._batch.date).getTime();
+      const batchUpdateDate = parseDate(this.batch.date).getTime();
       const reviewerId = accountKey(update.reviewer);
       if (
         updateDate - batchUpdateDate > REVIEWER_UPDATE_THRESHOLD_MILLIS ||
-        update.updated_by._account_id !== this._batch.author._account_id
+        update.updated_by._account_id !== this.batch.author._account_id
       ) {
         // Next sequential update should form new group.
-        this._completeBatch(this._batch);
-        if (isParserBatchWithNonEmptyUpdates(this._batch)) {
-          newUpdates.push(this._batch);
+        this._completeBatch(this.batch);
+        if (isParserBatchWithNonEmptyUpdates(this.batch)) {
+          newUpdates.push(this.batch);
         }
-        this._batch = this._startBatch(update);
+        this.batch = this._startBatch(update);
       }
-      // _startBatch assigns _updateItems. When _groupUpdates is calling,
-      // _batch and _updateItems are not set => _startBatch is called. The
-      // _startBatch method assigns _updateItems
-      const updateItems = this._updateItems!;
+      // _startBatch assigns updateItems. When _groupUpdates is calling,
+      // batch and updateItems are not set => _startBatch is called. The
+      // _startBatch method assigns updateItems
+      const updateItems = this.updateItems!;
       updateItems[reviewerId] = {
         reviewer: update.reviewer,
         state: update.state,
@@ -174,8 +174,8 @@
     }, [] as ParserBatchWithNonEmptyUpdates[]);
     // reviewer_updates always has at least 1 item
     // (otherwise parse is not created) => updates.reduce calls callback
-    // at least once and callback assigns this._batch
-    const batch = this._batch!;
+    // at least once and callback assigns this.batch
+    const batch = this.batch!;
     this._completeBatch(batch);
     if (isParserBatchWithNonEmptyUpdates(batch)) {
       newUpdates.push(batch);
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 b0b40dd..885db2a 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.ts
@@ -112,7 +112,7 @@
   @property({type: Boolean})
   hideBorder = false;
 
-  /** Text input should be rendered in monspace font.  */
+  /** Text input should be rendered in monospace font.  */
   @property({type: Boolean})
   monospace = false;
 
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
index 77d2d00..75ad608 100644
--- a/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin.ts
+++ b/polygerrit-ui/app/mixins/gr-tooltip-mixin/gr-tooltip-mixin.ts
@@ -69,13 +69,13 @@
       // Handler for mouseenter event
       private mouseenterHandler?: (e: MouseEvent) => void;
 
-      // Hanlder for scrolling on window
+      // Handler for scrolling on window
       private readonly windowScrollHandler: () => void;
 
-      // Hanlder for showing the tooltip, will be attached to certain events
+      // Handler for showing the tooltip, will be attached to certain events
       private readonly showHandler: () => void;
 
-      // Hanlder for hiding the tooltip, will be attached to certain events
+      // Handler for hiding the tooltip, will be attached to certain events
       private readonly hideHandler: () => void;
 
       // eslint-disable-next-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any
diff --git a/polygerrit-ui/app/mixins/iron-fit-mixin/iron-fit-mixin.ts b/polygerrit-ui/app/mixins/iron-fit-mixin/iron-fit-mixin.ts
index 662d6bf..57e034f 100644
--- a/polygerrit-ui/app/mixins/iron-fit-mixin/iron-fit-mixin.ts
+++ b/polygerrit-ui/app/mixins/iron-fit-mixin/iron-fit-mixin.ts
@@ -29,7 +29,7 @@
 // is used. To ensure that this import can't be avoided, the second parameter
 // is added. Usage example:
 // class Element extends IronFitMixin(PolymerElement, IronFitBehavior as IronFitBehavior)
-// The code 'IronFitBehavior as IronFitBehavior' required, becuase IronFitBehavior
+// The code 'IronFitBehavior as IronFitBehavior' required, because IronFitBehavior
 // defined as an object, not as IronFitBehavior instance.
 
 export const IronFitMixin = <T extends Constructor<PolymerElement>>(
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 7050cbe..ab85b87 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
@@ -107,7 +107,6 @@
   CustomKeyboardEvent,
   ShortcutTriggeredEventDetail,
 } from '../../types/events';
-import {appContext} from '../../services/app-context';
 
 /** Enum for all special shortcuts */
 export enum SPECIAL_SHORTCUT {
@@ -545,7 +544,7 @@
 }
 
 /**
- * Shortcut manager, holds all hosts, bindings and listners.
+ * Shortcut manager, holds all hosts, bindings and listeners.
  */
 export class ShortcutManager {
   private readonly activeHosts = new Map<PolymerElement, Map<string, string>>();
@@ -806,10 +805,6 @@
 
       ShortcutSection = ShortcutSection;
 
-      private _disableKeyboardShortcuts = false;
-
-      private restApiService = appContext.restApiService;
-
       modifierPressed(event: CustomKeyboardEvent) {
         /* 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.
@@ -831,7 +826,6 @@
       }
 
       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;
@@ -932,13 +926,6 @@
       /** @override */
       connectedCallback() {
         super.connectedCallback();
-
-        this.restApiService.getPreferences().then(prefs => {
-          if (prefs?.disable_keyboard_shortcuts) {
-            this._disableKeyboardShortcuts = true;
-          }
-        });
-
         const shortcuts = shortcutManager.attachHost(this);
         if (!shortcuts) {
           return;
diff --git a/polygerrit-ui/app/scripts/gr-email-suggestions-provider/gr-email-suggestions-provider.ts b/polygerrit-ui/app/scripts/gr-email-suggestions-provider/gr-email-suggestions-provider.ts
index 7969b84..5818003 100644
--- a/polygerrit-ui/app/scripts/gr-email-suggestions-provider/gr-email-suggestions-provider.ts
+++ b/polygerrit-ui/app/scripts/gr-email-suggestions-provider/gr-email-suggestions-provider.ts
@@ -19,10 +19,10 @@
 import {AccountInfo} from '../../types/common';
 
 export class GrEmailSuggestionsProvider {
-  constructor(private _restAPI: RestApiService) {}
+  constructor(private restAPI: RestApiService) {}
 
   getSuggestions(input: string) {
-    return this._restAPI.getSuggestedAccounts(`${input}`).then(accounts => {
+    return this.restAPI.getSuggestedAccounts(`${input}`).then(accounts => {
       if (!accounts) {
         return [];
       }
diff --git a/polygerrit-ui/app/scripts/gr-group-suggestions-provider/gr-group-suggestions-provider.ts b/polygerrit-ui/app/scripts/gr-group-suggestions-provider/gr-group-suggestions-provider.ts
index 1cf1c39..ff113fb 100644
--- a/polygerrit-ui/app/scripts/gr-group-suggestions-provider/gr-group-suggestions-provider.ts
+++ b/polygerrit-ui/app/scripts/gr-group-suggestions-provider/gr-group-suggestions-provider.ts
@@ -19,10 +19,10 @@
 import {GroupBaseInfo} from '../../types/common';
 
 export class GrGroupSuggestionsProvider {
-  constructor(private _restAPI: RestApiService) {}
+  constructor(private restAPI: RestApiService) {}
 
   getSuggestions(input: string) {
-    return this._restAPI.getSuggestedGroups(`${input}`).then(groups => {
+    return this.restAPI.getSuggestedGroups(`${input}`).then(groups => {
       if (!groups) {
         return [];
       }
diff --git a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.ts b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.ts
index 1572ba1..45116aa 100644
--- a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.ts
+++ b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider.ts
@@ -73,13 +73,13 @@
     }
   }
 
-  private _initPromise?: Promise<void>;
+  private initPromise?: Promise<void>;
 
-  private _config?: ServerInfo;
+  private config?: ServerInfo;
 
-  private _loggedIn = false;
+  private loggedIn = false;
 
-  private _initialized = false;
+  private initialized = false;
 
   private constructor(
     private readonly _restAPI: RestApiService,
@@ -87,26 +87,25 @@
   ) {}
 
   init() {
-    if (this._initPromise) {
-      return this._initPromise;
+    if (this.initPromise) {
+      return this.initPromise;
     }
     const getConfigPromise = this._restAPI.getConfig().then(cfg => {
-      this._config = cfg;
+      this.config = cfg;
     });
     const getLoggedInPromise = this._restAPI.getLoggedIn().then(loggedIn => {
-      this._loggedIn = loggedIn;
+      this.loggedIn = loggedIn;
     });
-    this._initPromise = Promise.all([
-      getConfigPromise,
-      getLoggedInPromise,
-    ]).then(() => {
-      this._initialized = true;
-    });
-    return this._initPromise;
+    this.initPromise = Promise.all([getConfigPromise, getLoggedInPromise]).then(
+      () => {
+        this.initialized = true;
+      }
+    );
+    return this.initPromise;
   }
 
   getSuggestions(input: string): Promise<Suggestion[]> {
-    if (!this._initialized || !this._loggedIn) {
+    if (!this.initialized || !this.loggedIn) {
       return Promise.resolve([]);
     }
 
@@ -117,7 +116,7 @@
     if (isReviewerAccountSuggestion(suggestion)) {
       // Reviewer is an account suggestion from getChangeSuggestedReviewers.
       return {
-        name: getAccountDisplayName(this._config, suggestion.account),
+        name: getAccountDisplayName(this.config, suggestion.account),
         value: suggestion,
       };
     }
@@ -133,7 +132,7 @@
     if (isAccountSuggestions(suggestion)) {
       // Reviewer is an account suggestion from getSuggestedAccounts.
       return {
-        name: getAccountDisplayName(this._config, suggestion),
+        name: getAccountDisplayName(this.config, suggestion),
         value: {account: suggestion, count: 1},
       };
     }
diff --git a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.js b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.js
index c7de24a..d3cad45 100644
--- a/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.js
+++ b/polygerrit-ui/app/scripts/gr-reviewer-suggestions-provider/gr-reviewer-suggestions-provider_test.js
@@ -130,7 +130,7 @@
           value: {account: {}},
         });
 
-        provider._config = {
+        provider.config = {
           user: {
             anonymous_coward_name: 'Anonymous Coward Name',
           },
@@ -179,10 +179,10 @@
       });
 
       test('getSuggestions short circuits when logged out', () => {
-        provider._loggedIn = false;
+        provider.loggedIn = false;
         return provider.getSuggestions('').then(() => {
           assert.isFalse(getChangeSuggestedReviewersStub.called);
-          provider._loggedIn = true;
+          provider.loggedIn = true;
           return provider.getSuggestions('').then(() => {
             assert.isTrue(getChangeSuggestedReviewersStub.called);
           });
diff --git a/polygerrit-ui/app/services/checks/checks-model.ts b/polygerrit-ui/app/services/checks/checks-model.ts
index 9546d0b..6705a85 100644
--- a/polygerrit-ui/app/services/checks/checks-model.ts
+++ b/polygerrit-ui/app/services/checks/checks-model.ts
@@ -17,6 +17,7 @@
 
 import {BehaviorSubject, Observable} from 'rxjs';
 import {
+  Action,
   Category,
   CheckResult,
   CheckRun,
@@ -35,6 +36,7 @@
   pluginName: string;
   config?: ChecksApiConfig;
   runs: CheckRun[];
+  actions: Action[];
 }
 
 interface ChecksState {
@@ -53,6 +55,18 @@
   distinctUntilChanged()
 );
 
+export const allActions$ = checksState$.pipe(
+  map(state => {
+    return Object.values(state).reduce(
+      (allActions: Action[], providerState: ChecksProviderState) => [
+        ...allActions,
+        ...providerState.actions,
+      ],
+      []
+    );
+  })
+);
+
 export const allRuns$ = checksState$.pipe(
   map(state => {
     return Object.values(state).reduce(
@@ -94,6 +108,7 @@
     pluginName,
     config,
     runs: [],
+    actions: [],
   };
   privateState$.next(nextState);
 }
@@ -162,11 +177,16 @@
   status: RunStatus.COMPLETED,
 };
 
-export function updateStateSetResults(pluginName: string, runs: CheckRun[]) {
+export function updateStateSetResults(
+  pluginName: string,
+  runs: CheckRun[],
+  actions: Action[] = []
+) {
   const nextState = {...privateState$.getValue()};
   nextState[pluginName] = {
     ...nextState[pluginName],
     runs: [...runs],
+    actions: [...actions],
   };
   privateState$.next(nextState);
 }
diff --git a/polygerrit-ui/app/services/checks/checks-service.ts b/polygerrit-ui/app/services/checks/checks-service.ts
index a8dd8b8..2e63f98 100644
--- a/polygerrit-ui/app/services/checks/checks-service.ts
+++ b/polygerrit-ui/app/services/checks/checks-service.ts
@@ -23,6 +23,7 @@
   withLatestFrom,
 } from 'rxjs/operators';
 import {
+  ChangeData,
   ChecksApiConfig,
   ChecksProvider,
   FetchResponse,
@@ -77,13 +78,20 @@
                 runs: [],
               });
             }
-            return from(
-              this.providers[pluginName].fetch(change._number, patchNum)
-            );
+            const data: ChangeData = {
+              changeNumber: change._number,
+              patchsetNumber: patchNum,
+              repo: change.project,
+            };
+            return from(this.providers[pluginName].fetch(data));
           }
         ),
         tap(response => {
-          updateStateSetResults(pluginName, response.runs ?? []);
+          updateStateSetResults(
+            pluginName,
+            response.runs ?? [],
+            response.actions
+          );
         })
       )
       .subscribe(() => {});
diff --git a/polygerrit-ui/app/services/checks/checks-util.ts b/polygerrit-ui/app/services/checks/checks-util.ts
index 30b82b6..176464f 100644
--- a/polygerrit-ui/app/services/checks/checks-util.ts
+++ b/polygerrit-ui/app/services/checks/checks-util.ts
@@ -135,3 +135,30 @@
       return 2;
   }
 }
+
+export interface ActionTriggeredEventDetail {
+  action: Action;
+  run?: CheckRun;
+}
+
+export type ActionTriggeredEvent = CustomEvent<ActionTriggeredEventDetail>;
+
+declare global {
+  interface HTMLElementEventMap {
+    'action-triggered': ActionTriggeredEvent;
+  }
+}
+
+export function fireActionTriggered(
+  target: EventTarget,
+  action: Action,
+  run?: CheckRun
+) {
+  target.dispatchEvent(
+    new CustomEvent('action-triggered', {
+      detail: {action, run},
+      composed: true,
+      bubbles: true,
+    })
+  );
+}
diff --git a/polygerrit-ui/app/services/gr-auth/gr-auth_impl.ts b/polygerrit-ui/app/services/gr-auth/gr-auth_impl.ts
index 8fe7c35..6fadfde 100644
--- a/polygerrit-ui/app/services/gr-auth/gr-auth_impl.ts
+++ b/polygerrit-ui/app/services/gr-auth/gr-auth_impl.ts
@@ -61,26 +61,26 @@
 
   static CREDS_EXPIRED_MSG = 'Credentials expired.';
 
-  private _authCheckPromise?: Promise<Response>;
+  private authCheckPromise?: Promise<Response>;
 
   private _last_auth_check_time: number = Date.now();
 
   private _status = AuthStatus.UNDETERMINED;
 
-  private _retriesLeft = MAX_GET_TOKEN_RETRIES;
+  private retriesLeft = MAX_GET_TOKEN_RETRIES;
 
-  private _cachedTokenPromise: Promise<Token | null> | null = null;
+  private cachedTokenPromise: Promise<Token | null> | null = null;
 
-  private _type?: AuthType;
+  private type?: AuthType;
 
-  private _defaultOptions: AuthRequestInit = {};
+  private defaultOptions: AuthRequestInit = {};
 
-  private _getToken: GetTokenCallback;
+  private getToken: GetTokenCallback;
 
   public eventEmitter: EventEmitterService;
 
   constructor(eventEmitter: EventEmitterService) {
-    this._getToken = () => Promise.resolve(this._cachedTokenPromise);
+    this.getToken = () => Promise.resolve(this.cachedTokenPromise);
     this.eventEmitter = eventEmitter;
   }
 
@@ -93,15 +93,15 @@
    */
   authCheck(): Promise<boolean> {
     if (
-      !this._authCheckPromise ||
+      !this.authCheckPromise ||
       Date.now() - this._last_auth_check_time > MAX_AUTH_CHECK_WAIT_TIME_MS
     ) {
       // Refetch after last check expired
-      this._authCheckPromise = fetch(`${this.baseUrl}/auth-check`);
+      this.authCheckPromise = fetch(`${this.baseUrl}/auth-check`);
       this._last_auth_check_time = Date.now();
     }
 
-    return this._authCheckPromise
+    return this.authCheckPromise
       .then(res => {
         // auth-check will return 204 if authed
         // treat the rest as unauthed
@@ -115,14 +115,14 @@
       })
       .catch(() => {
         this._setStatus(AuthStatus.ERROR);
-        // Reset _authCheckPromise to avoid caching the failed promise
-        this._authCheckPromise = undefined;
+        // Reset authCheckPromise to avoid caching the failed promise
+        this.authCheckPromise = undefined;
         return false;
       });
   }
 
   clearCache() {
-    this._authCheckPromise = undefined;
+    this.authCheckPromise = undefined;
   }
 
   private _setStatus(status: AuthStatus) {
@@ -149,15 +149,15 @@
    * Enable cross-domain authentication using OAuth access token.
    */
   setup(getToken: GetTokenCallback, defaultOptions: DefaultAuthOptions) {
-    this._retriesLeft = MAX_GET_TOKEN_RETRIES;
+    this.retriesLeft = MAX_GET_TOKEN_RETRIES;
     if (getToken) {
-      this._type = AuthType.ACCESS_TOKEN;
-      this._cachedTokenPromise = null;
-      this._getToken = getToken;
+      this.type = AuthType.ACCESS_TOKEN;
+      this.cachedTokenPromise = null;
+      this.getToken = getToken;
     }
-    this._defaultOptions = {};
+    this.defaultOptions = {};
     if (defaultOptions) {
-      this._defaultOptions.credentials = defaultOptions.credentials;
+      this.defaultOptions.credentials = defaultOptions.credentials;
     }
   }
 
@@ -167,10 +167,10 @@
   fetch(url: string, opt_options?: AuthRequestInit): Promise<Response> {
     const options: AuthRequestInitWithHeaders = {
       headers: new Headers(),
-      ...this._defaultOptions,
+      ...this.defaultOptions,
       ...opt_options,
     };
-    if (this._type === AuthType.ACCESS_TOKEN) {
+    if (this.type === AuthType.ACCESS_TOKEN) {
       return this._getAccessToken().then(accessToken =>
         this._fetchWithAccessToken(url, options, accessToken)
       );
@@ -224,17 +224,17 @@
   }
 
   private _getAccessToken(): Promise<string | null> {
-    if (!this._cachedTokenPromise) {
-      this._cachedTokenPromise = this._getToken();
+    if (!this.cachedTokenPromise) {
+      this.cachedTokenPromise = this.getToken();
     }
-    return this._cachedTokenPromise.then(token => {
+    return this.cachedTokenPromise.then(token => {
       if (this._isTokenValid(token)) {
-        this._retriesLeft = MAX_GET_TOKEN_RETRIES;
+        this.retriesLeft = MAX_GET_TOKEN_RETRIES;
         return token.access_token;
       }
-      if (this._retriesLeft > 0) {
-        this._retriesLeft--;
-        this._cachedTokenPromise = null;
+      if (this.retriesLeft > 0) {
+        this.retriesLeft--;
+        this.cachedTokenPromise = null;
         return this._getAccessToken();
       }
       // Fall back to anonymous access.
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
index 4ca983a..4196513 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
@@ -61,7 +61,7 @@
   timeEnd(name: string, eventDetails?: EventDetails): void;
   /**
    * Reports just line timeEnd, but additionally reports an average given a
-   * denominator and a separate reporiting name for the average.
+   * denominator and a separate reporting name for the average.
    *
    * @param name Timing name.
    * @param averageName Average timing name.
@@ -74,7 +74,7 @@
     denominator: number
   ): void;
   /**
-   * Get a timer object to for reporing a user timing. The start time will be
+   * Get a timer object for reporting a user timing. The start time will be
    * the time that the object has been created, and the end time will be the
    * time that the "end" method is called on the object.
    */
@@ -99,7 +99,7 @@
   reportExecution(id: string, details: EventDetails): void;
   reportInteraction(eventName: string, details?: EventDetails): void;
   /**
-   * A draft interaction was started. Update the time-betweeen-draft-actions
+   * A draft interaction was started. Update the time-between-draft-actions
    * timer.
    */
   recordDraftInteraction(): void;
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
index f80cb75..631a4e0 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
@@ -292,17 +292,17 @@
 
   private readonly _baselines = STARTUP_TIMERS;
 
-  private _reportRepoName: string | undefined;
+  private reportRepoName: string | undefined;
 
-  private _reportChangeId: NumericChangeId | undefined;
+  private reportChangeId: NumericChangeId | undefined;
 
-  private _timers: {timeBetweenDraftActions: Timer | null} = {
+  private timers: {timeBetweenDraftActions: Timer | null} = {
     timeBetweenDraftActions: null,
   };
 
-  private _pending: PendingReportInfo[] = [];
+  private pending: PendingReportInfo[] = [];
 
-  private _slowRpcList: SlowRpcCall[] = [];
+  private slowRpcList: SlowRpcCall[] = [];
 
   /**
    * Keeps track of which ids were already reported to have been executed.
@@ -321,7 +321,7 @@
   }
 
   private get slowRpcSnapshot() {
-    return (this._slowRpcList || []).slice();
+    return (this.slowRpcList || []).slice();
   }
 
   private _arePluginsLoaded() {
@@ -366,16 +366,16 @@
     }
 
     // We report events immediately when metrics plugin is loaded
-    if (this._isMetricsPluginLoaded() && !this._pending.length) {
+    if (this._isMetricsPluginLoaded() && !this.pending.length) {
       this._reportEvent(eventInfo, noLog);
     } else {
       // We cache until metrics plugin is loaded
-      this._pending.push([eventInfo, noLog]);
+      this.pending.push([eventInfo, noLog]);
       if (this._isMetricsPluginLoaded()) {
-        this._pending.forEach(([eventInfo, opt_noLog]) => {
+        this.pending.forEach(([eventInfo, opt_noLog]) => {
           this._reportEvent(eventInfo, opt_noLog);
         });
-        this._pending = [];
+        this.pending = [];
       }
     }
   }
@@ -417,11 +417,11 @@
       eventInfo.eventDetails = JSON.stringify(eventDetails);
     }
 
-    if (this._reportRepoName) {
-      eventInfo.repoName = this._reportRepoName;
+    if (this.reportRepoName) {
+      eventInfo.repoName = this.reportRepoName;
     }
-    if (this._reportChangeId) {
-      eventInfo.changeId = `${this._reportChangeId}`;
+    if (this.reportChangeId) {
+      eventInfo.changeId = `${this.reportChangeId}`;
     }
 
     const isInBackgroundTab = document.visibilityState === 'hidden';
@@ -501,10 +501,10 @@
     this.time(TIMER.DIFF_VIEW_DISPLAYED);
     this.time(TIMER.DIFF_VIEW_LOAD_FULL);
     this.time(TIMER.FILE_LIST_DISPLAYED);
-    this._reportRepoName = undefined;
-    this._reportChangeId = undefined;
+    this.reportRepoName = undefined;
+    this.reportChangeId = undefined;
     // reset slow rpc list since here start page loads which report these rpcs
-    this._slowRpcList = [];
+    this.slowRpcList = [];
     this.hiddenDurationTimer.reset();
   }
 
@@ -651,7 +651,7 @@
     if (baseTime !== 0) {
       window.performance.measure(name, `${name}-start`);
     } else {
-      // Microsft Edge does not handle the 2nd param correctly
+      // Microsoft Edge does not handle the 2nd param correctly
       // (if undefined).
       window.performance.measure(name);
     }
@@ -659,7 +659,7 @@
 
   /**
    * Reports just line timeEnd, but additionally reports an average given a
-   * denominator and a separate reporiting name for the average.
+   * denominator and a separate reporting name for the average.
    *
    * @param name Timing name.
    * @param averageName Average timing name.
@@ -703,7 +703,7 @@
   }
 
   /**
-   * Get a timer object to for reporing a user timing. The start time will be
+   * Get a timer object to for reporting a user timing. The start time will be
    * the time that the object has been created, and the end time will be the
    * time that the "end" method is called on the object.
    */
@@ -765,7 +765,7 @@
       true
     );
     if (elapsed >= SLOW_RPC_THRESHOLD) {
-      this._slowRpcList.push({anonymizedUrl, elapsed});
+      this.slowRpcList.push({anonymizedUrl, elapsed});
     }
   }
 
@@ -805,17 +805,17 @@
   }
 
   /**
-   * A draft interaction was started. Update the time-betweeen-draft-actions
+   * A draft interaction was started. Update the time-between-draft-actions
    * timer.
    */
   recordDraftInteraction() {
     // If there is no timer defined, then this is the first interaction.
     // Set up the timer so that it's ready to record the intervening time when
     // called again.
-    const timer = this._timers.timeBetweenDraftActions;
+    const timer = this.timers.timeBetweenDraftActions;
     if (!timer) {
       // Create a timer with a maximum length.
-      this._timers.timeBetweenDraftActions = this.getTimer(
+      this.timers.timeBetweenDraftActions = this.getTimer(
         DRAFT_ACTION_TIMER
       ).withMaximum(DRAFT_ACTION_TIMER_MAX);
       return;
@@ -848,11 +848,11 @@
   }
 
   setRepoName(repoName: string) {
-    this._reportRepoName = repoName;
+    this.reportRepoName = repoName;
   }
 
   setChangeId(changeId: NumericChangeId) {
-    this._reportChangeId = changeId;
+    this.reportChangeId = changeId;
   }
 }
 
diff --git a/polygerrit-ui/app/tsconfig.json b/polygerrit-ui/app/tsconfig.json
index 0d751ab..46d0173d 100644
--- a/polygerrit-ui/app/tsconfig.json
+++ b/polygerrit-ui/app/tsconfig.json
@@ -48,7 +48,7 @@
   "include": [
     // Items below must be in sync with the src_dirs list in the BUILD file
     // Also items must be in sync with tsconfig_bazel.json, tsconfig_bazel_test.json
-    // (include and exclude arrays are overriden when extends)
+    // (include and exclude arrays are overridden when extends)
     "api/**/*",
     "constants/**/*",
     "elements/**/*",
diff --git a/polygerrit-ui/app/tsconfig_bazel.json b/polygerrit-ui/app/tsconfig_bazel.json
index 46bd926..dfd2078 100644
--- a/polygerrit-ui/app/tsconfig_bazel.json
+++ b/polygerrit-ui/app/tsconfig_bazel.json
@@ -9,7 +9,7 @@
   "include": [
     // Items below must be in sync with the src_dirs list in the BUILD file
     // Also items must be in sync with tsconfig.json, tsconfig_bazel_test.json
-    // (include and exclude arrays are overriden when extends)
+    // (include and exclude arrays are overridden when extends)
     "api/**/*",
     "constants/**/*",
     "elements/**/*",
diff --git a/polygerrit-ui/app/tsconfig_bazel_test.json b/polygerrit-ui/app/tsconfig_bazel_test.json
index 1b6c226..9c2ff93 100644
--- a/polygerrit-ui/app/tsconfig_bazel_test.json
+++ b/polygerrit-ui/app/tsconfig_bazel_test.json
@@ -14,7 +14,7 @@
   "include": [
     // Items below must be in sync with the src_dirs list in the BUILD file
     // Also items must be in sync with tsconfig.json, tsconfig_test.json
-    // (include and exclude arrays are overriden when extends)
+    // (include and exclude arrays are overridden when extends)
     "api/**/*",
     "constants/**/*",
     "elements/**/*",
diff --git a/polygerrit-ui/app/types/common.ts b/polygerrit-ui/app/types/common.ts
index cf7e37d..711b11b 100644
--- a/polygerrit-ui/app/types/common.ts
+++ b/polygerrit-ui/app/types/common.ts
@@ -1021,7 +1021,7 @@
  */
 export interface PluginConfigInfo {
   has_avatars: boolean;
-  // The following 2 properies exists in Java class, but don't mention in docs
+  // The following 2 properties exists in Java class, but don't mention in docs
   js_resource_paths: string[];
   html_resource_paths: string[];
 }
@@ -1763,7 +1763,6 @@
   email_strategy: EmailStrategy;
   default_base_for_merges: DefaultBase;
   publish_comments_on_push?: boolean;
-  disable_keyboard_shortcuts?: boolean;
   work_in_progress_by_default?: boolean;
   // The email_format doesn't mentioned in doc, but exists in Java class GeneralPreferencesInfo
   email_format?: EmailFormat;
diff --git a/polygerrit-ui/app/utils/change-util.ts b/polygerrit-ui/app/utils/change-util.ts
index 1228863..a7f8b49 100644
--- a/polygerrit-ui/app/utils/change-util.ts
+++ b/polygerrit-ui/app/utils/change-util.ts
@@ -173,28 +173,44 @@
   return states;
 }
 
-export function isOwner(change?: ChangeInfo, account?: AccountInfo) {
+export function isOwner(change?: ChangeInfo, account?: AccountInfo): boolean {
   if (!change || !account) return false;
   return change.owner?._account_id === account._account_id;
 }
 
-export function isReviewer(change?: ChangeInfo, account?: AccountInfo) {
+export function isReviewer(
+  change?: ChangeInfo,
+  account?: AccountInfo
+): boolean {
   if (!change || !account) return false;
   const reviewers = change.reviewers.REVIEWER ?? [];
   return reviewers.some(r => r._account_id === account._account_id);
 }
 
-export function isUploader(change?: ChangeInfo, account?: AccountInfo) {
+export function isCc(change?: ChangeInfo, account?: AccountInfo): boolean {
+  if (!change || !account) return false;
+  const ccs = change.reviewers.CC ?? [];
+  return ccs.some(r => r._account_id === account._account_id);
+}
+
+export function isUploader(
+  change?: ChangeInfo,
+  account?: AccountInfo
+): boolean {
   if (!change || !account) return false;
   const rev = getCurrentRevision(change);
   return rev?.uploader?._account_id === account._account_id;
 }
 
-export function isInvolved(change?: ChangeInfo, account?: AccountInfo) {
+export function isInvolved(
+  change?: ChangeInfo,
+  account?: AccountInfo
+): boolean {
   const owner = isOwner(change, account);
   const uploader = isUploader(change, account);
   const reviewer = isReviewer(change, account);
-  return owner || uploader || reviewer;
+  const cc = isCc(change, account);
+  return owner || uploader || reviewer || cc;
 }
 
 export function getCurrentRevision(change?: ChangeInfo) {
diff --git a/polygerrit-ui/app/utils/common-util.ts b/polygerrit-ui/app/utils/common-util.ts
index f95105d..f4d6d51 100644
--- a/polygerrit-ui/app/utils/common-util.ts
+++ b/polygerrit-ui/app/utils/common-util.ts
@@ -69,6 +69,18 @@
 /**
  * Throws an error if the property is not defined.
  */
+export function checkRequiredProperty<T>(
+  property: T,
+  propertyName: string
+): asserts property is NonNullable<T> {
+  if (property === undefined || property === null) {
+    throw new Error(`Required property '${propertyName}' not set.`);
+  }
+}
+
+/**
+ * Throws an error if the property is not defined.
+ */
 export function assertIsDefined<T>(
   val: T,
   variableName = 'variable'
@@ -99,3 +111,14 @@
   }
   return true;
 }
+
+/**
+ * Add value, if the set does not contain it. Otherwise remove it.
+ */
+export function toggleSetMembership<T>(set: Set<T>, value: T): void {
+  if (set.has(value)) {
+    set.delete(value);
+  } else {
+    set.add(value);
+  }
+}
diff --git a/polygerrit-ui/app/utils/common-util_test.js b/polygerrit-ui/app/utils/common-util_test.js
index 917d652b..d6d66d7 100644
--- a/polygerrit-ui/app/utils/common-util_test.js
+++ b/polygerrit-ui/app/utils/common-util_test.js
@@ -29,7 +29,7 @@
       assert.isTrue(hasOwnProperty(obj, 'name with spaces'));
       assert.isFalse(hasOwnProperty(obj, 'def'));
     });
-    test('object prototype has overriden hasOwnProperty', () => {
+    test('object prototype has overridden hasOwnProperty', () => {
       const F = function() {
         this.abc = 23;
       };
diff --git a/polygerrit-ui/app/utils/dom-util.ts b/polygerrit-ui/app/utils/dom-util.ts
index aa83173..7f9ef72 100644
--- a/polygerrit-ui/app/utils/dom-util.ts
+++ b/polygerrit-ui/app/utils/dom-util.ts
@@ -16,6 +16,7 @@
  */
 
 import {EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
+import {check} from './common-util';
 
 /**
  * Event emitted from polymer elements.
@@ -155,7 +156,7 @@
 
 export function windowLocationReload() {
   const e = new Error();
-  console.info(`Calling window.location.realod(): ${e.stack}`);
+  console.info(`Calling window.location.reload(): ${e.stack}`);
   window.location.reload();
 }
 
@@ -258,3 +259,22 @@
     (/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream)
   );
 }
+
+export function whenVisible(
+  element: Element,
+  callback: () => void,
+  marginPx = 0
+) {
+  const observer = new IntersectionObserver(
+    (entries: IntersectionObserverEntry[]) => {
+      check(entries.length === 1, 'Expected one intersection observer entry.');
+      const entry = entries[0];
+      if (entry.isIntersecting) {
+        observer.unobserve(entry.target);
+        callback();
+      }
+    },
+    {rootMargin: `${marginPx}px`}
+  );
+  observer.observe(element);
+}
diff --git a/polygerrit-ui/app/utils/url-util_test.js b/polygerrit-ui/app/utils/url-util_test.js
index 0658be3..b1b17f4 100644
--- a/polygerrit-ui/app/utils/url-util_test.js
+++ b/polygerrit-ui/app/utils/url-util_test.js
@@ -25,15 +25,15 @@
 
 suite('url-util tests', () => {
   suite('getBaseUrl tests', () => {
-    let originialCanonicalPath;
+    let originalCanonicalPath;
 
     suiteSetup(() => {
-      originialCanonicalPath = window.CANONICAL_PATH;
+      originalCanonicalPath = window.CANONICAL_PATH;
       window.CANONICAL_PATH = '/r';
     });
 
     suiteTeardown(() => {
-      window.CANONICAL_PATH = originialCanonicalPath;
+      window.CANONICAL_PATH = originalCanonicalPath;
     });
 
     test('getBaseUrl', () => {