diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 3dcee80..91fe24b 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -1319,17 +1319,6 @@
 +
 The default is false.
 
-[[change.largeChange]]change.largeChange::
-+
-Number of changed lines from which on a change is considered as a large
-change. The number of changed lines of a change is the sum of the lines
-that were inserted and deleted in the change.
-+
-The specified value is used to visualize the change sizes in the Web UI
-in change tables and user dashboards.
-+
-By default 500.
-
 [[change.maxComments]]change.maxComments::
 +
 Maximum number of comments (regular plus robot) allowed per change. Additional
@@ -3408,7 +3397,7 @@
 config is backwards compatible with what the default was before the config
 was added.
 
-[[event.comment-added.publishPatchSetLevelComment]][event.comment-added.publishPatchSetLevelComment::
+[[event.comment-added.publishPatchSetLevelComment]]event.comment-added.publishPatchSetLevelComment::
 +
 Add patch set level comment as event comment. Without this option, patch set
 level comment will not be included in the event comment attribute. Given that
@@ -3423,9 +3412,9 @@
 [[experiments]]
 === Section experiments
 
-This section covers experimental new features. Gerrit's frontend uses experiments
-to research new behavior. Once the research is done, the experimental feature
-either stays and the experimentation flag gets removed, or the feature as a whole
+This section covers experimental new features. Gerrit uses experiments
+to research new behavior in frontend and core backend. Once the research is done, the experimental
+feature either stays and the experimentation flag gets removed, or the feature as a whole
 gets removed
 
 [[experiments.enabled]]experiments.enabled::
diff --git a/Documentation/dev-crafting-changes.txt b/Documentation/dev-crafting-changes.txt
index 4e248dd..7935f30 100644
--- a/Documentation/dev-crafting-changes.txt
+++ b/Documentation/dev-crafting-changes.txt
@@ -147,7 +147,7 @@
 link:https://github.com/google/google-java-format[`google-java-format`,role=external,window=_blank]
 tool (version 1.7), and to format Bazel BUILD, WORKSPACE and .bzl files the
 link:https://github.com/bazelbuild/buildtools/tree/master/buildifier[`buildifier`,role=external,window=_blank]
-tool (version 3.5.0). Unused dependencies are found and removed using the
+tool (version 4.0.0). Unused dependencies are found and removed using the
 link:https://github.com/bazelbuild/buildtools/tree/master/unused_deps[`unused_deps`,role=external,window=_blank]
 build tool, a sibling of `buildifier`.
 
@@ -160,6 +160,9 @@
 wrapper script. If you run your own copy, please use the same version,
 as there may be slight differences between versions.
 
+[[code-rules]]
+== Code Rules
+=== Final
 When to use `final` modifier and when not (in new code):
 
 Always:
@@ -181,6 +184,12 @@
   be removed
   * method parameters: similar to local variables
 
+=== Optional / Nullable
+Recommended:
+
+  * Optionals in arguments are discouraged (use @Nullable instead)
+  * Return types should be objects or Optionals of objects, but not null/nullable
+
 [[code-organization]]
 == Code Organization
 
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 9876b53..3a5fb96 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -14,10 +14,11 @@
 'POST /changes/'
 --
 
-The change input link:#change-input[ChangeInput] entity must be provided in the
-request body. It is not allowed to create changes on refs/tags/* or Gerrit
-internal refs such as refs/changes/*, refs/meta/external-ids/*, refs/users/*,
-etc.. and the request would fail with `400 Bad Request` in this case.
+The change input link:#change-input[ChangeInput] entity must be
+provided in the request body. It is not allowed to create changes
+under `refs/tags/` or Gerrit internal ref namespaces such as
+`refs/changes/`, `refs/meta/external-ids/`, and `refs/users/`. The
+request would fail with `400 Bad Request` in this case.
 
 To create a change the calling user must be allowed to
 link:access-control.html#category_push_review[upload to code review].
@@ -563,6 +564,12 @@
   }
 ----
 
+Historical state of the change can be retrieved by specifying the
+`meta=SHA1` parameter. This will use a historical NoteDb snapshot to
+populate ChangeInfo. If the SHA1 is not reachable as a NoteDb state,
+status code 412 is returned.
+
+
 [[get-change-detail]]
 === Get Change Detail
 --
@@ -6466,6 +6473,8 @@
 Only set if link:#current-revision[the current revision] is requested
 (in which case it will only contain a key for the current revision) or
 if link:#all-revisions[all revisions] are requested.
+|`meta_rev_id`           |optional|
+The SHA1 of the NoteDb meta ref.
 |`tracking_ids`       |optional|
 A list of link:#tracking-id-info[TrackingIdInfo] entities describing
 references to external tracking systems. Only set if
diff --git a/Documentation/rest-api-config.txt b/Documentation/rest-api-config.txt
index a62ed47..9764c8a 100644
--- a/Documentation/rest-api-config.txt
+++ b/Documentation/rest-api-config.txt
@@ -1552,9 +1552,6 @@
 |`allow_blame`        |not set if `false`|
 link:config-gerrit.html#change.allowBlame[Whether blame on side by side diff is
 allowed].
-|`large_change`       ||
-link:config-gerrit.html#change.largeChange[Number of changed lines from
-which on a change is considered as a large change].
 |`reply_label`        ||
 link:config-gerrit.html#change.replyTooltip[Label name for the reply
 button].
diff --git a/Documentation/rest-api-projects.txt b/Documentation/rest-api-projects.txt
index 677fc6d..49bc7e5 100644
--- a/Documentation/rest-api-projects.txt
+++ b/Documentation/rest-api-projects.txt
@@ -4211,8 +4211,10 @@
 |`branches`                  |optional|
 A list of branches that should be initially created. +
 For the branch names the `refs/heads/` prefix can be omitted. +
-The first entry of the list will be the default branch (ie. the target +
-of the `HEAD` symbolic ref).
+The first entry of the list will be the default branch (ie. the target
+of the `HEAD` symbolic ref). +
+Branches in the Gerrit internal ref space are not allowed, such as
+refs/groups/, refs/changes/, etc...
 |`owners`                    |optional|
 A list of groups that should be assigned as project owner. +
 Each group in the list must be specified as
diff --git a/Documentation/user-porting-comments.txt b/Documentation/user-porting-comments.txt
index b85e592..8b6c005 100644
--- a/Documentation/user-porting-comments.txt
+++ b/Documentation/user-porting-comments.txt
@@ -4,7 +4,7 @@
 
 Comments in Gerrit are associated with a patchset. When a new patchset is uploaded, the comments are lost since they are not associated with the newer patchset.
 
-image::images/user-porting-comment-original-comment.png["Comment left on Patchset 15", align="center"]
+image::images/user-porting-comments-original-comment.png["Comment left on Patchset 15", align="center"]
 
 To solve this issue, Gerrit now has “Ported Comments”. These are comments that were left on an older patchset displayed on all the newer patchsets uploaded. For example, a comment left on Patchset 6 will be ported over to Patchset 7, 8 and all subsequent patchsets that are uploaded, not just the latest patchset.
 
@@ -18,7 +18,7 @@
 
 Resolved comments are not ported over.
 
-image::images/user-porting-comment-ported-comment.png["Comment ported over to patchset 16", align="center"]
+image::images/user-porting-comments-ported-comment.png["Comment ported over to patchset 16", align="center"]
 
 ## Interaction
 
diff --git a/WORKSPACE b/WORKSPACE
index 0767907..ccbc63d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -34,11 +34,11 @@
 
 http_archive(
     name = "bazel_toolchains",
-    sha256 = "726b5423e1c7a3866a3a6d68e7123b4a955e9fcbe912a51e0f737e6dab1d0af2",
-    strip_prefix = "bazel-toolchains-3.1.0",
+    sha256 = "1adf7a8e9901287c644dcf9ca08dd8d67a69df94bedbd57a841490a84dc1e9ed",
+    strip_prefix = "bazel-toolchains-5.0.0",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/v5.0.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-toolchains/archive/v5.0.0.tar.gz",
     ],
 )
 
diff --git a/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/CreateChange-body.json b/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/CreateChange-body.json
index 23bf26c..8babac8 100644
--- a/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/CreateChange-body.json
+++ b/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/CreateChange-body.json
@@ -1,5 +1,5 @@
 {
   "project": "${project}",
-  "branch": "master",
+  "branch": "${branch}",
   "subject": "Change"
 }
diff --git a/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/SubmitChangeInBranch.json b/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/SubmitChangeInBranch.json
new file mode 100644
index 0000000..301c65b
--- /dev/null
+++ b/e2e-tests/src/test/resources/data/com/google/gerrit/scenarios/SubmitChangeInBranch.json
@@ -0,0 +1,5 @@
+[
+  {
+    "url": "HTTP_SCHEME://HOSTNAME:HTTP_PORT/a/changes/"
+  }
+]
diff --git a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/ApproveChange.scala b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/ApproveChange.scala
index 8ae69d7..5e4f671 100644
--- a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/ApproveChange.scala
+++ b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/ApproveChange.scala
@@ -19,10 +19,15 @@
 import io.gatling.core.structure.ScenarioBuilder
 import io.gatling.http.Predef.http
 
+import scala.collection.mutable
+
 class ApproveChange extends GerritSimulation {
-  private val data: FeederBuilder = jsonFile(resource).convert(keys).queue
+  private val data: FeederBuilder = jsonFile(resource).convert(keys).circular
+  private var numbersCopy: mutable.Queue[Int] = mutable.Queue[Int]()
   private var createChange: Option[CreateChange] = None
 
+  override def relativeRuntimeWeight = 10
+
   def this(createChange: CreateChange) {
     this()
     this.createChange = Some(createChange)
@@ -32,7 +37,10 @@
       .feed(data)
       .exec(session => {
         if (createChange.nonEmpty) {
-          session.set("number", createChange.get.number)
+          if (numbersCopy.isEmpty) {
+            numbersCopy = createChange.get.numbers.clone()
+          }
+          session.set("number", numbersCopy.dequeue())
         } else {
           session
         }
diff --git a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateBranch.scala b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateBranch.scala
index ccde633..3630a7a 100644
--- a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateBranch.scala
+++ b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateBranch.scala
@@ -19,18 +19,27 @@
 import io.gatling.core.structure.ScenarioBuilder
 import io.gatling.http.Predef._
 
+import scala.collection.mutable
 import scala.concurrent.duration._
 
 class CreateBranch extends ProjectSimulation {
   private val data: FeederBuilder = jsonFile(resource).convert(keys).circular
   private val branchIdKey = "branchId"
   private var counter = 0
+  var branches: mutable.Queue[String] = mutable.Queue[String]()
 
-  private val test: ScenarioBuilder = scenario(uniqueName)
+  def this(projectName: String) {
+    this()
+    this.projectName = projectName
+  }
+
+  val test: ScenarioBuilder = scenario(uniqueName)
       .feed(data)
       .exec(session => {
         counter += 1
-        session.set(branchIdKey, "branch-" + counter)
+        val branchId = "branch-" + counter
+        branches += branchId
+        session.set(branchIdKey, branchId)
       })
       .exec(http(uniqueName)
           .post("${url}${" + branchIdKey + "}")
diff --git a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateChange.scala b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateChange.scala
index b0063cb..b28edb5 100644
--- a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateChange.scala
+++ b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/CreateChange.scala
@@ -25,18 +25,37 @@
 class CreateChange extends ProjectSimulation {
   private val data: FeederBuilder = jsonFile(resource).convert(keys).circular
   private val numberKey = "_number"
+  private val weightPerUser = 0.1
+  private var createBranch: Option[CreateBranch] = None
+  private var branchesCopy: mutable.Queue[String] = mutable.Queue[String]()
   var number = 0
   var numbers: mutable.Queue[Int] = mutable.Queue[Int]()
 
-  override def relativeRuntimeWeight = 2
+  override def relativeRuntimeWeight: Int = 2 + (numberOfUsers * weightPerUser).toInt
 
   def this(projectName: String) {
     this()
     this.projectName = projectName
   }
 
+  def this(projectName: String, createBranch: CreateBranch) {
+    this()
+    this.projectName = projectName
+    this.createBranch = Some(createBranch)
+  }
+
   val test: ScenarioBuilder = scenario(uniqueName)
       .feed(data)
+      .exec(session => {
+        var branchId = "master"
+        if (createBranch.nonEmpty) {
+          if (branchesCopy.isEmpty) {
+            branchesCopy = createBranch.get.branches.clone()
+          }
+          branchId = branchesCopy.dequeue()
+        }
+        session.set("branch", branchId)
+      })
       .exec(httpRequest
           .body(ElFileBody(body)).asJson
           .check(regex("\"" + numberKey + "\":(\\d+),").saveAs(numberKey)))
diff --git a/e2e-tests/src/test/scala/com/google/gerrit/scenarios/SubmitChangeInBranch.scala b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/SubmitChangeInBranch.scala
new file mode 100644
index 0000000..1b88503
--- /dev/null
+++ b/e2e-tests/src/test/scala/com/google/gerrit/scenarios/SubmitChangeInBranch.scala
@@ -0,0 +1,74 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.scenarios
+
+import io.gatling.core.Predef.{atOnceUsers, _}
+import io.gatling.core.feeder.FeederBuilder
+import io.gatling.core.structure.ScenarioBuilder
+import io.gatling.http.Predef.http
+
+import scala.collection.mutable
+import scala.concurrent.duration._
+
+class SubmitChangeInBranch extends GerritSimulation {
+  private val data: FeederBuilder = jsonFile(resource).convert(keys).circular
+  private var changesCopy: mutable.Queue[Int] = mutable.Queue[Int]()
+  private val projectName = className
+
+  override def relativeRuntimeWeight = 10
+
+  private val test: ScenarioBuilder = scenario(uniqueName)
+      .feed(data)
+      .exec(session => {
+        if (changesCopy.isEmpty) {
+          changesCopy = createChange.numbers.clone()
+        }
+        session.set("number", changesCopy.dequeue())
+      })
+      .exec(http(uniqueName).post("${url}${number}/submit"))
+
+  private val createProject = new CreateProject(projectName)
+  private val createBranch = new CreateBranch(projectName)
+  private val createChange = new CreateChange(projectName, createBranch)
+  private val approveChange = new ApproveChange(createChange)
+  private val deleteProject = new DeleteProject(projectName)
+
+  setUp(
+    createProject.test.inject(
+      nothingFor(stepWaitTime(createProject) seconds),
+      atOnceUsers(single)
+    ),
+    createBranch.test.inject(
+      nothingFor(stepWaitTime(createBranch) seconds),
+      atOnceUsers(numberOfUsers)
+    ),
+    createChange.test.inject(
+      nothingFor(stepWaitTime(createChange) seconds),
+      atOnceUsers(numberOfUsers)
+    ),
+    approveChange.test.inject(
+      nothingFor(stepWaitTime(approveChange) seconds),
+      atOnceUsers(numberOfUsers)
+    ),
+    test.inject(
+      nothingFor(stepWaitTime(this) seconds),
+      atOnceUsers(numberOfUsers)
+    ),
+    deleteProject.test.inject(
+      nothingFor(stepWaitTime(deleteProject) seconds),
+      atOnceUsers(single)
+    ),
+  ).protocols(httpProtocol)
+}
diff --git a/java/com/google/gerrit/acceptance/GerritServer.java b/java/com/google/gerrit/acceptance/GerritServer.java
index b02dc87..f2cc9d1 100644
--- a/java/com/google/gerrit/acceptance/GerritServer.java
+++ b/java/com/google/gerrit/acceptance/GerritServer.java
@@ -50,6 +50,7 @@
 import com.google.gerrit.server.config.GerritRuntime;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePath;
+import com.google.gerrit.server.experiments.ConfigExperimentFeatures;
 import com.google.gerrit.server.git.receive.AsyncReceiveCommits;
 import com.google.gerrit.server.schema.JdbcAccountPatchReviewStore;
 import com.google.gerrit.server.ssh.NoSshModule;
@@ -437,7 +438,8 @@
               protected void configure() {
                 bind(GerritRuntime.class).toInstance(GerritRuntime.DAEMON);
               }
-            }));
+            },
+            new ConfigExperimentFeatures.Module()));
     daemon.addAdditionalSysModuleForTesting(
         new ReindexProjectsAtStartup.Module(), new ReindexGroupsAtStartup.Module());
     daemon.start();
diff --git a/java/com/google/gerrit/auth/BUILD b/java/com/google/gerrit/auth/BUILD
index a390e14..609ec8a 100644
--- a/java/com/google/gerrit/auth/BUILD
+++ b/java/com/google/gerrit/auth/BUILD
@@ -20,8 +20,6 @@
         "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
-        "//java/com/google/gerrit/git",
-        "//java/com/google/gerrit/jgit",
         "//java/com/google/gerrit/proto",
         "//java/com/google/gerrit/server",
         "//java/com/google/gerrit/server/cache/serialize",
diff --git a/java/com/google/gerrit/common/data/testing/BUILD b/java/com/google/gerrit/common/data/testing/BUILD
index b9ec30b..d39d05c 100644
--- a/java/com/google/gerrit/common/data/testing/BUILD
+++ b/java/com/google/gerrit/common/data/testing/BUILD
@@ -6,7 +6,6 @@
     srcs = glob(["**/*.java"]),
     visibility = ["//visibility:public"],
     deps = [
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//lib/truth",
     ],
diff --git a/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java b/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
index 969ffa5..162654d 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
@@ -37,6 +37,7 @@
 import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.index.FieldDef;
 import com.google.gerrit.index.QueryOptions;
+import com.google.gerrit.index.RefState;
 import com.google.gerrit.index.Schema;
 import com.google.gerrit.index.query.DataSource;
 import com.google.gerrit.index.query.Predicate;
@@ -354,7 +355,7 @@
 
     // Ref-state.
     if (fields.contains(ChangeField.REF_STATE.getName())) {
-      cd.setRefStates(getByteArray(source, ChangeField.REF_STATE.getName()));
+      cd.setRefStates(RefState.parseStates(getByteArray(source, ChangeField.REF_STATE.getName())));
     }
 
     // Ref-state-pattern.
diff --git a/java/com/google/gerrit/elasticsearch/ElasticVersion.java b/java/com/google/gerrit/elasticsearch/ElasticVersion.java
index bba1577..5e72780 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticVersion.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticVersion.java
@@ -18,8 +18,6 @@
 import java.util.regex.Pattern;
 
 public enum ElasticVersion {
-  V7_2("7.2.*"),
-  V7_3("7.3.*"),
   V7_4("7.4.*"),
   V7_5("7.5.*"),
   V7_6("7.6.*"),
diff --git a/java/com/google/gerrit/entities/RefNames.java b/java/com/google/gerrit/entities/RefNames.java
index 4272960..2263aba 100644
--- a/java/com/google/gerrit/entities/RefNames.java
+++ b/java/com/google/gerrit/entities/RefNames.java
@@ -180,16 +180,6 @@
     return ref.startsWith(REFS_CHANGES);
   }
 
-  /** True if the provided ref is in {@code refs/changes/../meta}. */
-  public static boolean isRefsMetaChanges(String ref) {
-    return ref.startsWith(REFS_CHANGES) && ref.endsWith(META_SUFFIX);
-  }
-
-  /** True if the provided ref is in {@code refs/changes/../robot-comments}. */
-  public static boolean isRobotCommentMetaRef(String ref) {
-    return ref.startsWith(REFS_CHANGES) && ref.endsWith(ROBOT_COMMENTS_SUFFIX);
-  }
-
   public static String refsGroups(AccountGroup.UUID groupUuid) {
     return REFS_GROUPS + shardUuid(groupUuid.get());
   }
diff --git a/java/com/google/gerrit/extensions/common/ChangeConfigInfo.java b/java/com/google/gerrit/extensions/common/ChangeConfigInfo.java
index a441bfd..b387017 100644
--- a/java/com/google/gerrit/extensions/common/ChangeConfigInfo.java
+++ b/java/com/google/gerrit/extensions/common/ChangeConfigInfo.java
@@ -19,7 +19,6 @@
   public Boolean allowBlame;
   public Boolean showAssigneeInChangesTable;
   public Boolean disablePrivateChanges;
-  public int largeChange;
   public String replyLabel;
   public String replyTooltip;
   public int updateDelay;
diff --git a/java/com/google/gerrit/extensions/common/ChangeInfo.java b/java/com/google/gerrit/extensions/common/ChangeInfo.java
index 7ed2f95..528efe3 100644
--- a/java/com/google/gerrit/extensions/common/ChangeInfo.java
+++ b/java/com/google/gerrit/extensions/common/ChangeInfo.java
@@ -70,6 +70,7 @@
   public String submissionId;
   public Integer cherryPickOfChange;
   public Integer cherryPickOfPatchSet;
+  public String metaRevId;
 
   /**
    * Whether the change contains conflicts.
diff --git a/java/com/google/gerrit/extensions/common/FileInfo.java b/java/com/google/gerrit/extensions/common/FileInfo.java
index 32c5bd5..510c2ad 100644
--- a/java/com/google/gerrit/extensions/common/FileInfo.java
+++ b/java/com/google/gerrit/extensions/common/FileInfo.java
@@ -34,8 +34,8 @@
           && Objects.equals(oldPath, fileInfo.oldPath)
           && Objects.equals(linesInserted, fileInfo.linesInserted)
           && Objects.equals(linesDeleted, fileInfo.linesDeleted)
-          && Objects.equals(sizeDelta, fileInfo.sizeDelta)
-          && Objects.equals(size, fileInfo.size);
+          && sizeDelta == fileInfo.sizeDelta
+          && size == fileInfo.size;
     }
     return false;
   }
diff --git a/java/com/google/gerrit/extensions/restapi/NeedsParams.java b/java/com/google/gerrit/extensions/restapi/NeedsParams.java
index c6e2151..bb4294f 100644
--- a/java/com/google/gerrit/extensions/restapi/NeedsParams.java
+++ b/java/com/google/gerrit/extensions/restapi/NeedsParams.java
@@ -19,7 +19,9 @@
 /**
  * Optional interface for {@link RestCollection}.
  *
- * <p>Collections that implement this interface can get to know about the request parameters.
+ * <p>Collections that implement this interface can get to know about the request parameters. The
+ * request parameters are passed only if the collection is the endpoint, e.g. {@code
+ * /changes/?q=abc} would trigger, but {@code /changes/100/?q=abc} does not.
  */
 public interface NeedsParams {
   /**
diff --git a/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java b/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
index 46dde41..8d52f5a 100644
--- a/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
+++ b/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
@@ -20,7 +20,6 @@
 
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.ImmutableSet;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.common.UsedAt;
@@ -31,6 +30,7 @@
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.json.OutputFormat;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
 import com.google.gson.Gson;
 import com.google.template.soy.data.SanitizedContent;
 import java.net.URI;
@@ -38,21 +38,15 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Function;
-import org.eclipse.jgit.lib.Config;
 
 /** Helper for generating parts of {@code index.html}. */
 @UsedAt(Project.GOOGLE)
 public class IndexHtmlUtil {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
 
-  static final ImmutableSet<String> DEFAULT_EXPERIMENTS =
-      ImmutableSet.of(
-          "UiFeature__patchset_comments", "UiFeature__patchset_choice_for_comment_links");
-
   private static final Gson GSON = OutputFormat.JSON_COMPACT.newGson();
   /**
    * Returns both static and dynamic parameters of {@code index.html}. The result is to be used when
@@ -60,7 +54,7 @@
    */
   public static ImmutableMap<String, Object> templateData(
       GerritApi gerritApi,
-      Config gerritServerConfig,
+      ExperimentFeatures experimentFeatures,
       String canonicalURL,
       String cdnPath,
       String faviconPath,
@@ -73,14 +67,8 @@
             staticTemplateData(
                 canonicalURL, cdnPath, faviconPath, urlParameterMap, urlInScriptTagOrdainer))
         .putAll(dynamicTemplateData(gerritApi, requestedURL));
+    Set<String> enabledExperiments = experimentFeatures.getEnabledExperimentFeatures();
 
-    Set<String> enabledExperiments = new HashSet<>();
-    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "enabled"))
-        .forEach(enabledExperiments::add);
-    DEFAULT_EXPERIMENTS.forEach(enabledExperiments::add);
-    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "disabled"))
-        .forEach(enabledExperiments::remove);
-    experimentData(urlParameterMap).forEach(enabledExperiments::add);
     if (!enabledExperiments.isEmpty()) {
       data.put("enabledExperiments", serializeObject(GSON, enabledExperiments).toString());
     }
diff --git a/java/com/google/gerrit/httpd/raw/IndexServlet.java b/java/com/google/gerrit/httpd/raw/IndexServlet.java
index b2bdf7c..3f2c202 100644
--- a/java/com/google/gerrit/httpd/raw/IndexServlet.java
+++ b/java/com/google/gerrit/httpd/raw/IndexServlet.java
@@ -22,6 +22,7 @@
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.extensions.api.GerritApi;
 import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
 import com.google.template.soy.SoyFileSet;
 import com.google.template.soy.data.SanitizedContent;
 import com.google.template.soy.data.UnsafeSanitizedContentOrdainer;
@@ -34,7 +35,6 @@
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import org.eclipse.jgit.lib.Config;
 
 public class IndexServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
@@ -43,7 +43,7 @@
   @Nullable private final String cdnPath;
   @Nullable private final String faviconPath;
   private final GerritApi gerritApi;
-  private final Config gerritServerConfig;
+  private final ExperimentFeatures experimentFeatures;
   private final SoySauce soySauce;
   private final Function<String, SanitizedContent> urlOrdainer;
 
@@ -52,12 +52,12 @@
       @Nullable String cdnPath,
       @Nullable String faviconPath,
       GerritApi gerritApi,
-      Config gerritServerConfig) {
+      ExperimentFeatures experimentFeatures) {
     this.canonicalUrl = canonicalUrl;
     this.cdnPath = cdnPath;
     this.faviconPath = faviconPath;
     this.gerritApi = gerritApi;
-    this.gerritServerConfig = gerritServerConfig;
+    this.experimentFeatures = experimentFeatures;
     this.soySauce =
         SoyFileSet.builder()
             .add(Resources.getResource("com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy"))
@@ -79,7 +79,7 @@
       ImmutableMap<String, Object> templateData =
           IndexHtmlUtil.templateData(
               gerritApi,
-              gerritServerConfig,
+              experimentFeatures,
               canonicalUrl,
               cdnPath,
               faviconPath,
diff --git a/java/com/google/gerrit/httpd/raw/StaticModule.java b/java/com/google/gerrit/httpd/raw/StaticModule.java
index 66e107b..cac716f 100644
--- a/java/com/google/gerrit/httpd/raw/StaticModule.java
+++ b/java/com/google/gerrit/httpd/raw/StaticModule.java
@@ -30,6 +30,7 @@
 import com.google.gerrit.server.config.GerritOptions;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
 import com.google.inject.Inject;
 import com.google.inject.Key;
 import com.google.inject.Provides;
@@ -221,11 +222,12 @@
     HttpServlet getPolyGerritUiIndexServlet(
         @CanonicalWebUrl @Nullable String canonicalUrl,
         @GerritServerConfig Config cfg,
-        GerritApi gerritApi) {
+        GerritApi gerritApi,
+        ExperimentFeatures experimentFeatures) {
       String cdnPath =
           options.useDevCdn() ? options.devCdn() : cfg.getString("gerrit", null, "cdnPath");
       String faviconPath = cfg.getString("gerrit", null, "faviconPath");
-      return new IndexServlet(canonicalUrl, cdnPath, faviconPath, gerritApi, cfg);
+      return new IndexServlet(canonicalUrl, cdnPath, faviconPath, gerritApi, experimentFeatures);
     }
 
     @Provides
diff --git a/java/com/google/gerrit/index/RefState.java b/java/com/google/gerrit/index/RefState.java
index 956dcab..ed38de9 100644
--- a/java/com/google/gerrit/index/RefState.java
+++ b/java/com/google/gerrit/index/RefState.java
@@ -20,8 +20,7 @@
 
 import com.google.auto.value.AutoValue;
 import com.google.common.base.Splitter;
-import com.google.common.collect.MultimapBuilder;
-import com.google.common.collect.SetMultimap;
+import com.google.common.collect.ImmutableSetMultimap;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.git.ObjectIds;
@@ -33,10 +32,10 @@
 
 @AutoValue
 public abstract class RefState {
-  public static SetMultimap<Project.NameKey, RefState> parseStates(Iterable<byte[]> states) {
+  public static ImmutableSetMultimap<Project.NameKey, RefState> parseStates(
+      Iterable<byte[]> states) {
     RefState.check(states != null, null);
-    SetMultimap<Project.NameKey, RefState> result =
-        MultimapBuilder.hashKeys().hashSetValues().build();
+    ImmutableSetMultimap.Builder<Project.NameKey, RefState> result = ImmutableSetMultimap.builder();
     for (byte[] b : states) {
       RefState.check(b != null, null);
       String s = new String(b, UTF_8);
@@ -44,7 +43,7 @@
       RefState.check(parts.size() == 3 && !parts.get(0).isEmpty() && !parts.get(1).isEmpty(), s);
       result.put(Project.nameKey(parts.get(0)), RefState.create(parts.get(1), parts.get(2)));
     }
-    return result;
+    return result.build();
   }
 
   public static RefState create(String ref, String sha) {
diff --git a/java/com/google/gerrit/lucene/LuceneChangeIndex.java b/java/com/google/gerrit/lucene/LuceneChangeIndex.java
index f4b9e69..c3d4440 100644
--- a/java/com/google/gerrit/lucene/LuceneChangeIndex.java
+++ b/java/com/google/gerrit/lucene/LuceneChangeIndex.java
@@ -49,6 +49,7 @@
 import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.index.FieldDef;
 import com.google.gerrit.index.QueryOptions;
+import com.google.gerrit.index.RefState;
 import com.google.gerrit.index.Schema;
 import com.google.gerrit.index.query.FieldBundle;
 import com.google.gerrit.index.query.Predicate;
@@ -702,7 +703,7 @@
   }
 
   private void decodeRefStates(ListMultimap<String, IndexableField> doc, ChangeData cd) {
-    cd.setRefStates(copyAsBytes(doc.get(REF_STATE_FIELD)));
+    cd.setRefStates(RefState.parseStates(copyAsBytes(doc.get(REF_STATE_FIELD))));
   }
 
   private void decodeRefStatePatterns(ListMultimap<String, IndexableField> doc, ChangeData cd) {
diff --git a/java/com/google/gerrit/pgm/util/BUILD b/java/com/google/gerrit/pgm/util/BUILD
index f7c2b75..cfdd383 100644
--- a/java/com/google/gerrit/pgm/util/BUILD
+++ b/java/com/google/gerrit/pgm/util/BUILD
@@ -12,7 +12,6 @@
         "//java/com/google/gerrit/metrics",
         "//java/com/google/gerrit/metrics/dropwizard",
         "//java/com/google/gerrit/server",
-        "//java/com/google/gerrit/server/cache/h2",
         "//java/com/google/gerrit/server/cache/mem",
         "//java/com/google/gerrit/server/restapi",
         "//java/com/google/gerrit/server/schema",
diff --git a/java/com/google/gerrit/pgm/util/SiteProgram.java b/java/com/google/gerrit/pgm/util/SiteProgram.java
index 98558fb..c3be0a4 100644
--- a/java/com/google/gerrit/pgm/util/SiteProgram.java
+++ b/java/com/google/gerrit/pgm/util/SiteProgram.java
@@ -28,6 +28,7 @@
 import com.google.gerrit.server.config.GerritRuntime;
 import com.google.gerrit.server.config.GerritServerConfigModule;
 import com.google.gerrit.server.config.SitePath;
+import com.google.gerrit.server.experiments.ConfigExperimentFeatures;
 import com.google.gerrit.server.git.GitRepositoryManagerModule;
 import com.google.gerrit.server.git.SystemReaderInstaller;
 import com.google.gerrit.server.schema.SchemaModule;
@@ -128,6 +129,9 @@
 
     modules.add(new SchemaModule());
     modules.add(cfgInjector.getInstance(GitRepositoryManagerModule.class));
+    // The only implementation of experiments is available in all programs that can use
+    // gerrit.config
+    modules.add(new ConfigExperimentFeatures.Module());
 
     try {
       return Guice.createInjector(
diff --git a/java/com/google/gerrit/server/BUILD b/java/com/google/gerrit/server/BUILD
index 69e398d..9fa7456 100644
--- a/java/com/google/gerrit/server/BUILD
+++ b/java/com/google/gerrit/server/BUILD
@@ -62,7 +62,6 @@
         "//java/com/google/gerrit/server/util/git",
         "//java/com/google/gerrit/server/util/time",
         "//java/com/google/gerrit/util/cli",
-        "//java/com/google/gerrit/util/ssl",
         "//java/org/apache/commons/net",
         "//lib:args4j",
         "//lib:autolink",
@@ -144,7 +143,6 @@
     visibility = ["//visibility:public"],
     deps = [
         ":server",
-        "//java/com/google/gerrit/auth",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/server/git/receive",
         "//java/com/google/gerrit/server/logging",
diff --git a/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java b/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java
index 36d48033..573f2f5 100644
--- a/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java
+++ b/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java
@@ -106,7 +106,7 @@
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevWalk;
 
-class RevisionApiImpl implements RevisionApi {
+class RevisionApiImpl extends RevisionApi.NotImplemented {
   interface Factory {
     RevisionApiImpl create(RevisionResource r);
   }
@@ -687,11 +687,6 @@
   }
 
   @Override
-  public String etag() throws RestApiException {
-    return revisionActions.getETag(revision);
-  }
-
-  @Override
   public BinaryResult getArchive(ArchiveFormat format) throws RestApiException {
     GetArchive getArchive = getArchiveProvider.get();
     getArchive.setFormat(format != null ? format.name().toLowerCase(Locale.US) : null);
diff --git a/java/com/google/gerrit/server/cache/serialize/entities/BUILD b/java/com/google/gerrit/server/cache/serialize/entities/BUILD
index cb8c4ae..55080e8 100644
--- a/java/com/google/gerrit/server/cache/serialize/entities/BUILD
+++ b/java/com/google/gerrit/server/cache/serialize/entities/BUILD
@@ -5,12 +5,8 @@
     srcs = glob(["*.java"]),
     visibility = ["//visibility:public"],
     deps = [
-        "//java/com/google/gerrit/common:annotations",
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
-        "//java/com/google/gerrit/git",
-        "//java/com/google/gerrit/proto",
         "//java/com/google/gerrit/server/cache/serialize",
         "//lib:guava",
         "//lib:jgit",
diff --git a/java/com/google/gerrit/server/change/ChangeJson.java b/java/com/google/gerrit/server/change/ChangeJson.java
index f292245..c7aedb6 100644
--- a/java/com/google/gerrit/server/change/ChangeJson.java
+++ b/java/com/google/gerrit/server/change/ChangeJson.java
@@ -47,6 +47,7 @@
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.flogger.FluentLogger;
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.Address;
 import com.google.gerrit.entities.Change;
@@ -54,6 +55,7 @@
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.PatchSetApproval;
 import com.google.gerrit.entities.Project;
+import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.entities.SubmitRecord.Status;
 import com.google.gerrit.entities.SubmitRequirement;
@@ -75,6 +77,7 @@
 import com.google.gerrit.extensions.common.SubmitRequirementInfo;
 import com.google.gerrit.extensions.common.TrackingIdInfo;
 import com.google.gerrit.extensions.restapi.Url;
+import com.google.gerrit.index.RefState;
 import com.google.gerrit.index.query.QueryResult;
 import com.google.gerrit.metrics.Description;
 import com.google.gerrit.metrics.Description.Units;
@@ -119,6 +122,7 @@
 import java.util.Set;
 import java.util.stream.Collectors;
 import org.eclipse.jgit.lib.Config;
+import org.eclipse.jgit.lib.ObjectId;
 
 /**
  * Produces {@link ChangeInfo} (which is serialized to JSON afterwards) from {@link ChangeData}.
@@ -281,6 +285,11 @@
     return format(changeDataFactory.create(change));
   }
 
+  public ChangeInfo format(Change change, @Nullable ObjectId metaRevId) {
+    ChangeNotes notes = notesFactory.createChecked(change.getProject(), change.getId(), metaRevId);
+    return format(changeDataFactory.create(notes));
+  }
+
   public ChangeInfo format(ChangeData cd) {
     return format(cd, Optional.empty(), true, getPluginInfos(cd));
   }
@@ -323,9 +332,13 @@
   }
 
   public ChangeInfo format(Project.NameKey project, Change.Id id) {
+    return format(project, id, null);
+  }
+
+  public ChangeInfo format(Project.NameKey project, Change.Id id, @Nullable ObjectId metaRevId) {
     ChangeNotes notes;
     try {
-      notes = notesFactory.createChecked(project, id);
+      notes = notesFactory.createChecked(project, id, metaRevId);
     } catch (StorageException e) {
       if (!has(CHECK)) {
         throw e;
@@ -570,6 +583,15 @@
     out.totalCommentCount = cd.totalCommentCount();
     out.unresolvedCommentCount = cd.unresolvedCommentCount();
 
+    if (cd.getRefStates() != null) {
+      String metaName = RefNames.changeMetaRef(cd.getId());
+      Optional<RefState> metaState =
+          cd.getRefStates().values().stream().filter(r -> r.ref().equals(metaName)).findAny();
+
+      // metaState should always be there, but it doesn't hurt to be extra careful.
+      metaState.ifPresent(rs -> out.metaRevId = rs.id().getName());
+    }
+
     if (user.isIdentifiedUser()) {
       Collection<String> stars = cd.stars(user.getAccountId());
       out.starred = stars.contains(StarredChangesUtil.DEFAULT_LABEL) ? true : null;
diff --git a/java/com/google/gerrit/server/change/FileInfoJsonNewImpl.java b/java/com/google/gerrit/server/change/FileInfoJsonNewImpl.java
index ed046826..0d3dcff 100644
--- a/java/com/google/gerrit/server/change/FileInfoJsonNewImpl.java
+++ b/java/com/google/gerrit/server/change/FileInfoJsonNewImpl.java
@@ -89,8 +89,8 @@
       FileDiffOutput fileDiff = fileDiffs.get(path);
       FileInfo fileInfo = new FileInfo();
       fileInfo.status =
-          fileDiff.changeType().get() != Patch.ChangeType.MODIFIED
-              ? fileDiff.changeType().get().getCode()
+          fileDiff.changeType() != Patch.ChangeType.MODIFIED
+              ? fileDiff.changeType().getCode()
               : null;
       fileInfo.oldPath = fileDiff.oldPath().orElse(null);
       fileInfo.sizeDelta = fileDiff.sizeDelta();
diff --git a/java/com/google/gerrit/server/comment/CommentContextLoader.java b/java/com/google/gerrit/server/comment/CommentContextLoader.java
index 63bb8d0..c93f4b1 100644
--- a/java/com/google/gerrit/server/comment/CommentContextLoader.java
+++ b/java/com/google/gerrit/server/comment/CommentContextLoader.java
@@ -26,7 +26,6 @@
 import com.google.gerrit.entities.Comment;
 import com.google.gerrit.entities.CommentContext;
 import com.google.gerrit.entities.Project;
-import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.extensions.common.ContextLineInfo;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.patch.ComparisonType;
@@ -158,12 +157,10 @@
 
   private static CommentContext createContext(Text src, Range commentRange, int contextPadding) {
     if (commentRange.start() < 1 || commentRange.end() - 1 > src.size()) {
-      throw new StorageException(
-          "Invalid comment range "
-              + commentRange
-              + ". Text only contains "
-              + src.size()
-              + " lines.");
+      // TODO(ghareeb): We should throw an exception in this case. See
+      // https://bugs.chromium.org/p/gerrit/issues/detail?id=14102 which is an example where the
+      // diff contains an extra line not in the original file.
+      return CommentContext.empty();
     }
     commentRange = adjustRange(commentRange, contextPadding, src.size());
     ImmutableMap.Builder<Integer, String> context =
diff --git a/java/com/google/gerrit/server/data/BUILD b/java/com/google/gerrit/server/data/BUILD
index c3dc672..1aaab96 100644
--- a/java/com/google/gerrit/server/data/BUILD
+++ b/java/com/google/gerrit/server/data/BUILD
@@ -9,7 +9,6 @@
     deps = [
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
-        "//java/org/apache/commons/net",
         "//lib:gson",
     ],
 )
diff --git a/java/com/google/gerrit/server/experiments/ConfigExperimentFeatures.java b/java/com/google/gerrit/server/experiments/ConfigExperimentFeatures.java
new file mode 100644
index 0000000..f526935
--- /dev/null
+++ b/java/com/google/gerrit/server/experiments/ConfigExperimentFeatures.java
@@ -0,0 +1,63 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.experiments;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.inject.AbstractModule;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+import org.eclipse.jgit.lib.Config;
+
+/**
+ * An implementation of {@link ExperimentFeatures} that uses gerrit.config to evaluate the status of
+ * the feature.
+ */
+@Singleton
+public class ConfigExperimentFeatures implements ExperimentFeatures {
+
+  public static class Module extends AbstractModule {
+    @Override
+    protected void configure() {
+      bind(ExperimentFeatures.class).to(ConfigExperimentFeatures.class);
+    }
+  }
+
+  private ImmutableSet<String> enabledExperimentFeatures;
+
+  @Inject
+  public ConfigExperimentFeatures(@GerritServerConfig Config gerritServerConfig) {
+    Set<String> enabledExperiments = new HashSet<>();
+    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "enabled"))
+        .forEach(enabledExperiments::add);
+    ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES.forEach(enabledExperiments::add);
+    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "disabled"))
+        .forEach(enabledExperiments::remove);
+    enabledExperimentFeatures = ImmutableSet.copyOf(enabledExperiments);
+  }
+
+  @Override
+  public boolean isFeatureEnabled(String featureFlag) {
+    return getEnabledExperimentFeatures().contains(featureFlag);
+  }
+
+  @Override
+  public ImmutableSet<String> getEnabledExperimentFeatures() {
+    return enabledExperimentFeatures;
+  }
+}
diff --git a/java/com/google/gerrit/server/experiments/ExperimentFeatures.java b/java/com/google/gerrit/server/experiments/ExperimentFeatures.java
new file mode 100644
index 0000000..dc9148a
--- /dev/null
+++ b/java/com/google/gerrit/server/experiments/ExperimentFeatures.java
@@ -0,0 +1,44 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.experiments;
+
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Features that can be enabled/disabled on Gerrit (e. g. experiments to research new behavior in
+ * the current release).
+ *
+ * <p>It may depend on the implementation if the result is decided on the per-request basis or not,
+ * so the outcomes should not be persisted in {@link com.google.inject.Singleton}.
+ */
+public interface ExperimentFeatures {
+
+  /**
+   * Given the name of the feature, returns if it is enabled on the Gerrit server.
+   *
+   * <p>Depending on the implementation, it can be more efficient than filtering the results of
+   * {@link ExperimentFeatures#getEnabledExperimentFeatures}.
+   *
+   * @param featureFlag the name of the feature to test.
+   * @return if the feature is enabled.
+   */
+  boolean isFeatureEnabled(String featureFlag);
+
+  /**
+   * Returns the names of the features that are enabled on Gerrit instance (either by default or via
+   * gerrit.config).
+   */
+  ImmutableSet<String> getEnabledExperimentFeatures();
+}
diff --git a/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
new file mode 100644
index 0000000..af49438
--- /dev/null
+++ b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
@@ -0,0 +1,28 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.experiments;
+
+import com.google.common.collect.ImmutableSet;
+
+/** Constants for Gerrit {@link ExperimentFeatures} */
+public class ExperimentFeaturesConstants {
+
+  /** Features that are known experiments and can be referenced in the code. */
+  public static String UI_FEATURE_PATCHSET_COMMENTS = "UiFeature__patchset_comments";
+
+  /** Features, enabled by default in the current release. */
+  public static final ImmutableSet<String> DEFAULT_ENABLED_FEATURES =
+      ImmutableSet.of(UI_FEATURE_PATCHSET_COMMENTS);
+}
diff --git a/java/com/google/gerrit/server/git/SearchingChangeCacheImpl.java b/java/com/google/gerrit/server/git/SearchingChangeCacheImpl.java
index c3d4777..fed6541 100644
--- a/java/com/google/gerrit/server/git/SearchingChangeCacheImpl.java
+++ b/java/com/google/gerrit/server/git/SearchingChangeCacheImpl.java
@@ -17,12 +17,10 @@
 import com.google.auto.value.AutoValue;
 import com.google.common.cache.CacheLoader;
 import com.google.common.cache.LoadingCache;
-import com.google.common.collect.ImmutableList;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.common.UsedAt;
 import com.google.gerrit.entities.Change;
-import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
@@ -44,7 +42,6 @@
 import com.google.inject.name.Named;
 import com.google.inject.util.Providers;
 import java.util.ArrayList;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.ExecutionException;
@@ -99,10 +96,6 @@
 
     @Nullable
     abstract ReviewerSet reviewers();
-
-    abstract Collection<PatchSet> patchSets();
-
-    abstract ImmutableList<byte[]> refStates();
   }
 
   private final LoadingCache<Project.NameKey, List<CachedChange>> cache;
@@ -132,8 +125,6 @@
       for (CachedChange cc : cached) {
         ChangeData cd = changeDataFactory.create(cc.change());
         cd.setReviewers(cc.reviewers());
-        cd.setPatchSets(cc.patchSets());
-        cd.setRefStates(cc.refStates());
         cds.add(cd);
       }
       return Collections.unmodifiableList(cds);
@@ -169,17 +160,12 @@
         List<ChangeData> cds =
             queryProvider
                 .get()
-                .setRequestedFields(
-                    ChangeField.CHANGE,
-                    ChangeField.REVIEWER,
-                    ChangeField.REF_STATE,
-                    ChangeField.PATCH_SET)
+                .setRequestedFields(ChangeField.CHANGE, ChangeField.REVIEWER)
                 .byProject(key);
         List<CachedChange> result = new ArrayList<>(cds.size());
         for (ChangeData cd : cds) {
           result.add(
-              new AutoValue_SearchingChangeCacheImpl_CachedChange(
-                  cd.change(), cd.reviewers(), cd.patchSets(), cd.getRefStates()));
+              new AutoValue_SearchingChangeCacheImpl_CachedChange(cd.change(), cd.reviewers()));
         }
         return Collections.unmodifiableList(result);
       }
diff --git a/java/com/google/gerrit/server/group/testing/BUILD b/java/com/google/gerrit/server/group/testing/BUILD
index fd61dff..77bb777 100644
--- a/java/com/google/gerrit/server/group/testing/BUILD
+++ b/java/com/google/gerrit/server/group/testing/BUILD
@@ -7,7 +7,6 @@
     testonly = True,
     srcs = glob(["*.java"]),
     deps = [
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/server",
         "//lib:guava",
diff --git a/java/com/google/gerrit/server/index/change/ChangeField.java b/java/com/google/gerrit/server/index/change/ChangeField.java
index 5f2525e..59600e0 100644
--- a/java/com/google/gerrit/server/index/change/ChangeField.java
+++ b/java/com/google/gerrit/server/index/change/ChangeField.java
@@ -57,7 +57,6 @@
 import com.google.gerrit.entities.converter.PatchSetProtoConverter;
 import com.google.gerrit.entities.converter.ProtoConverter;
 import com.google.gerrit.index.FieldDef;
-import com.google.gerrit.index.RefState;
 import com.google.gerrit.index.SchemaUtil;
 import com.google.gerrit.json.OutputFormat;
 import com.google.gerrit.proto.Protos;
@@ -66,9 +65,7 @@
 import com.google.gerrit.server.StarredChangesUtil;
 import com.google.gerrit.server.config.AllUsersName;
 import com.google.gerrit.server.index.change.StalenessChecker.RefStatePattern;
-import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.notedb.ReviewerStateInternal;
-import com.google.gerrit.server.notedb.RobotCommentNotes;
 import com.google.gerrit.server.project.SubmitRuleOptions;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.query.change.ChangeQueryBuilder;
@@ -982,27 +979,9 @@
           .buildRepeatable(
               cd -> {
                 List<byte[]> result = new ArrayList<>();
-                Project.NameKey project = cd.change().getProject();
-
-                cd.editRefs()
-                    .values()
-                    .forEach(r -> result.add(RefState.of(r).toByteArray(project)));
-                cd.starRefs()
-                    .values()
-                    .forEach(r -> result.add(RefState.of(r.ref()).toByteArray(allUsers(cd))));
-
-                ChangeNotes notes = cd.notes();
-                result.add(
-                    RefState.create(notes.getRefName(), notes.getMetaId()).toByteArray(project));
-                notes.getRobotComments(); // Force loading robot comments.
-                RobotCommentNotes robotNotes = notes.getRobotCommentNotes();
-                result.add(
-                    RefState.create(robotNotes.getRefName(), robotNotes.getMetaId())
-                        .toByteArray(project));
-                cd.draftRefs()
-                    .values()
-                    .forEach(r -> result.add(RefState.of(r).toByteArray(allUsers(cd))));
-
+                cd.getRefStates()
+                    .entries()
+                    .forEach(e -> result.add(e.getValue().toByteArray(e.getKey())));
                 return result;
               });
 
diff --git a/java/com/google/gerrit/server/index/change/StalenessChecker.java b/java/com/google/gerrit/server/index/change/StalenessChecker.java
index 7e50104..ad5cc2b 100644
--- a/java/com/google/gerrit/server/index/change/StalenessChecker.java
+++ b/java/com/google/gerrit/server/index/change/StalenessChecker.java
@@ -93,7 +93,7 @@
       return StalenessCheckResult.stale("Document %s missing from index", id);
     }
     ChangeData cd = result.get();
-    return check(repoManager, id, parseStates(cd), parsePatterns(cd));
+    return check(repoManager, id, cd.getRefStates(), parsePatterns(cd));
   }
 
   /**
@@ -127,10 +127,6 @@
     return StalenessCheckResult.notStale();
   }
 
-  private SetMultimap<Project.NameKey, RefState> parseStates(ChangeData cd) {
-    return RefState.parseStates(cd.getRefStates());
-  }
-
   private ListMultimap<Project.NameKey, RefStatePattern> parsePatterns(ChangeData cd) {
     return parsePatterns(cd.getRefStatePatterns());
   }
diff --git a/java/com/google/gerrit/server/mail/send/AddKeySender.java b/java/com/google/gerrit/server/mail/send/AddKeySender.java
index 0d447ca..652766a 100644
--- a/java/com/google/gerrit/server/mail/send/AddKeySender.java
+++ b/java/com/google/gerrit/server/mail/send/AddKeySender.java
@@ -15,7 +15,6 @@
 package com.google.gerrit.server.mail.send;
 
 import com.google.common.base.Joiner;
-import com.google.gerrit.entities.Address;
 import com.google.gerrit.exceptions.EmailException;
 import com.google.gerrit.extensions.api.changes.RecipientType;
 import com.google.gerrit.server.IdentifiedUser;
@@ -68,7 +67,7 @@
     super.init();
     setHeader("Subject", String.format("[Gerrit Code Review] New %s Keys Added", getKeyType()));
     setMessageId(messageIdGenerator.fromAccountUpdate(user.getAccountId()));
-    add(RecipientType.TO, Address.create(getEmail()));
+    add(RecipientType.TO, user.getAccountId());
   }
 
   @Override
diff --git a/java/com/google/gerrit/server/mail/send/DeleteKeySender.java b/java/com/google/gerrit/server/mail/send/DeleteKeySender.java
index 46e7fd8..d6d306c 100644
--- a/java/com/google/gerrit/server/mail/send/DeleteKeySender.java
+++ b/java/com/google/gerrit/server/mail/send/DeleteKeySender.java
@@ -15,7 +15,6 @@
 package com.google.gerrit.server.mail.send;
 
 import com.google.common.base.Joiner;
-import com.google.gerrit.entities.Address;
 import com.google.gerrit.exceptions.EmailException;
 import com.google.gerrit.extensions.api.changes.RecipientType;
 import com.google.gerrit.server.IdentifiedUser;
@@ -71,7 +70,7 @@
     super.init();
     setHeader("Subject", String.format("[Gerrit Code Review] %s Keys Deleted", getKeyType()));
     setMessageId(messageIdGenerator.fromAccountUpdate(user.getAccountId()));
-    add(RecipientType.TO, Address.create(getEmail()));
+    add(RecipientType.TO, user.getAccountId());
   }
 
   @Override
diff --git a/java/com/google/gerrit/server/mail/send/HttpPasswordUpdateSender.java b/java/com/google/gerrit/server/mail/send/HttpPasswordUpdateSender.java
index c1c2f31..045c6a4 100644
--- a/java/com/google/gerrit/server/mail/send/HttpPasswordUpdateSender.java
+++ b/java/com/google/gerrit/server/mail/send/HttpPasswordUpdateSender.java
@@ -14,7 +14,6 @@
 
 package com.google.gerrit.server.mail.send;
 
-import com.google.gerrit.entities.Address;
 import com.google.gerrit.exceptions.EmailException;
 import com.google.gerrit.extensions.api.changes.RecipientType;
 import com.google.gerrit.server.IdentifiedUser;
@@ -51,7 +50,7 @@
     setMessageId(
         messageIdGenerator.fromReasonAccountIdAndTimestamp(
             "HTTP_password_change", user.getAccountId(), TimeUtil.now()));
-    add(RecipientType.TO, Address.create(getEmail()));
+    add(RecipientType.TO, user.getAccountId());
   }
 
   @Override
diff --git a/java/com/google/gerrit/server/mail/send/MailSoySauceProvider.java b/java/com/google/gerrit/server/mail/send/MailSoySauceProvider.java
index 1b58057..aade30f 100644
--- a/java/com/google/gerrit/server/mail/send/MailSoySauceProvider.java
+++ b/java/com/google/gerrit/server/mail/send/MailSoySauceProvider.java
@@ -113,6 +113,11 @@
 
   private void addTemplate(SoyFileSet.Builder builder, String resourcePath, String name)
       throws ProvisionException {
+    if (!resourcePath.endsWith("/")) {
+      resourcePath += "/";
+    }
+    String logicalPath = resourcePath + name;
+
     // Load as a file in the mail templates directory if present.
     Path tmpl = site.mail_dir.resolve(name);
     if (Files.isRegularFile(tmpl)) {
@@ -125,14 +130,11 @@
         throw new ProvisionException(
             "Failed to read template file " + tmpl.toAbsolutePath().toString(), err);
       }
-      builder.add(content, tmpl.toAbsolutePath().toString());
+      builder.add(content, logicalPath);
       return;
     }
 
     // Otherwise load the template as a resource.
-    if (!resourcePath.endsWith("/")) {
-      resourcePath += "/";
-    }
-    builder.add(Resources.getResource(resourcePath + name));
+    builder.add(Resources.getResource(logicalPath), logicalPath);
   }
 }
diff --git a/java/com/google/gerrit/server/notedb/AbstractChangeNotes.java b/java/com/google/gerrit/server/notedb/AbstractChangeNotes.java
index 9b5b4d4..a7c7757 100644
--- a/java/com/google/gerrit/server/notedb/AbstractChangeNotes.java
+++ b/java/com/google/gerrit/server/notedb/AbstractChangeNotes.java
@@ -37,6 +37,8 @@
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
 
 /** View of contents at a single ref related to some change. * */
 public abstract class AbstractChangeNotes<T> {
@@ -118,9 +120,14 @@
   private ObjectId revision;
   private boolean loaded;
 
-  protected AbstractChangeNotes(Args args, Change.Id changeId) {
+  protected AbstractChangeNotes(Args args, Change.Id changeId, @Nullable ObjectId metaSha1) {
     this.args = requireNonNull(args);
     this.changeId = requireNonNull(changeId);
+    this.revision = metaSha1;
+  }
+
+  protected AbstractChangeNotes(Args args, Change.Id changeId) {
+    this(args, changeId, null);
   }
 
   public Change.Id getChangeId() {
@@ -144,7 +151,7 @@
         Repository repo = args.repoManager.openRepository(getProjectName());
         // Call openHandle even if reading is disabled, to trigger
         // auto-rebuilding before this object may get passed to a ChangeUpdate.
-        LoadHandle handle = openHandle(repo)) {
+        LoadHandle handle = openHandle(repo, revision)) {
       revision = handle.id();
       onLoad(handle);
       loaded = true;
@@ -168,13 +175,17 @@
    * @param repo open repository.
    * @return handle for reading the entity.
    * @throws NoSuchChangeException change does not exist.
+   * @throws MissingMetaObjectException specified SHA1 isn't reachable from meta branch.
    * @throws IOException a repo-level error occurred.
    */
-  protected LoadHandle openHandle(Repository repo) throws NoSuchChangeException, IOException {
-    return openHandle(repo, readRef(repo));
-  }
+  protected LoadHandle openHandle(Repository repo, @Nullable ObjectId id)
+      throws NoSuchChangeException, IOException, MissingMetaObjectException {
+    if (id == null) {
+      id = readRef(repo);
+    } else {
+      verifyMetaId(repo, id);
+    }
 
-  protected LoadHandle openHandle(Repository repo, ObjectId id) {
     return new LoadHandle(repo, id);
   }
 
@@ -215,4 +226,20 @@
   protected final T self() {
     return (T) this;
   }
+
+  private void verifyMetaId(Repository repo, ObjectId id)
+      throws IOException, MissingMetaObjectException {
+    try (RevWalk rw = new RevWalk(repo)) {
+      Ref ref = repo.getRefDatabase().exactRef(getRefName());
+      RevCommit tip = rw.parseCommit(ref.getObjectId());
+      rw.markStart(tip);
+      for (RevCommit rev : rw) {
+        if (id.equals(rev)) {
+          return;
+        }
+      }
+    }
+
+    throw new MissingMetaObjectException(id.getName() + " not reachable from " + getRefName());
+  }
 }
diff --git a/java/com/google/gerrit/server/notedb/ChangeNotes.java b/java/com/google/gerrit/server/notedb/ChangeNotes.java
index cf09ff3..77d7bc0 100644
--- a/java/com/google/gerrit/server/notedb/ChangeNotes.java
+++ b/java/com/google/gerrit/server/notedb/ChangeNotes.java
@@ -114,9 +114,14 @@
       return createChecked(c.getProject(), c.getId());
     }
 
-    public ChangeNotes createChecked(Project.NameKey project, Change.Id changeId) {
+    public ChangeNotes createChecked(
+        Project.NameKey project, Change.Id changeId, @Nullable ObjectId metaRevId) {
       Change change = newChange(project, changeId);
-      return new ChangeNotes(args, change, true, null).load();
+      return new ChangeNotes(args, change, true, null, metaRevId).load();
+    }
+
+    public ChangeNotes createChecked(Project.NameKey project, Change.Id changeId) {
+      return createChecked(project, changeId, null);
     }
 
     public static Change newChange(Project.NameKey project, Change.Id changeId) {
@@ -333,14 +338,23 @@
   private ImmutableListMultimap<PatchSet.Id, PatchSetApproval> approvals;
   private ImmutableSet<Comment.Key> commentKeys;
 
-  @VisibleForTesting
-  public ChangeNotes(Args args, Change change, boolean shouldExist, @Nullable RefCache refs) {
-    super(args, change.getId());
+  public ChangeNotes(
+      Args args,
+      Change change,
+      boolean shouldExist,
+      @Nullable RefCache refs,
+      @Nullable ObjectId metaSha1) {
+    super(args, change.getId(), metaSha1);
     this.change = new Change(change);
     this.shouldExist = shouldExist;
     this.refs = refs;
   }
 
+  @VisibleForTesting
+  public ChangeNotes(Args args, Change change, boolean shouldExist, @Nullable RefCache refs) {
+    this(args, change, shouldExist, refs, null);
+  }
+
   public Change getChange() {
     return change;
   }
diff --git a/java/com/google/gerrit/server/notedb/MissingMetaObjectException.java b/java/com/google/gerrit/server/notedb/MissingMetaObjectException.java
new file mode 100644
index 0000000..ffe9fa8
--- /dev/null
+++ b/java/com/google/gerrit/server/notedb/MissingMetaObjectException.java
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.notedb;
+
+/** Separate exception type to throw if requested meta SHA1 is not available. */
+public class MissingMetaObjectException extends RuntimeException {
+  MissingMetaObjectException(String msg) {
+    super(msg);
+  }
+}
diff --git a/java/com/google/gerrit/server/patch/AutoMerger.java b/java/com/google/gerrit/server/patch/AutoMerger.java
index 2e0214c..fe915c5 100644
--- a/java/com/google/gerrit/server/patch/AutoMerger.java
+++ b/java/com/google/gerrit/server/patch/AutoMerger.java
@@ -67,6 +67,8 @@
  * is that these refs should never be deleted.
  */
 public class AutoMerger {
+  public static final String AUTO_MERGE_MSG_PREFIX = "Auto-merge of ";
+
   @UsedAt(UsedAt.Project.GOOGLE)
   public static boolean cacheAutomerge(Config cfg) {
     return cfg.getBoolean("change", null, "cacheAutomerge", true);
@@ -198,7 +200,7 @@
     cb.setAuthor(ident);
     cb.setCommitter(ident);
     cb.setTreeId(tree);
-    cb.setMessage("Auto-merge of " + merge.name() + '\n');
+    cb.setMessage(AUTO_MERGE_MSG_PREFIX + merge.name() + '\n');
     for (RevCommit p : merge.getParents()) {
       cb.addParentId(p);
     }
diff --git a/java/com/google/gerrit/server/patch/DiffOperations.java b/java/com/google/gerrit/server/patch/DiffOperations.java
index 1d8438e..8b90531 100644
--- a/java/com/google/gerrit/server/patch/DiffOperations.java
+++ b/java/com/google/gerrit/server/patch/DiffOperations.java
@@ -17,6 +17,7 @@
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Patch;
 import com.google.gerrit.entities.Project;
+import com.google.gerrit.extensions.client.DiffPreferencesInfo;
 import com.google.gerrit.server.patch.filediff.FileDiffOutput;
 import java.util.Map;
 import org.eclipse.jgit.lib.ObjectId;
@@ -73,34 +74,47 @@
   /**
    * Returns the diff for a single file between a patchset commit against its parent or the
    * auto-merge commit. For deleted files, the {@code fileName} parameter should contain the old
-   * name of the file.
+   * name of the file. This method will return {@link FileDiffOutput#empty(String)} if the requested
+   * file identified by {@code fileName} has unchanged content or does not exist at both commits.
    *
    * @param project a project name representing a git repository.
    * @param newCommit 20 bytes SHA-1 of the new commit used in the diff.
    * @param parentNum integer specifying which parent to use as base. If null, the only parent will
    *     be used or the auto-merge if {@code newCommit} is a merge commit.
    * @param fileName the file name for which the diff should be evaluated.
+   * @param whitespace preference controlling whitespace effect in diff computation.
    * @return the diff for the single file between the two commits.
    * @throws DiffNotAvailableException if an internal error occurred in Git while evaluating the
    *     diff, or if an exception happened while parsing the base commit.
    */
   FileDiffOutput getModifiedFileAgainstParent(
-      Project.NameKey project, ObjectId newCommit, @Nullable Integer parentNum, String fileName)
+      Project.NameKey project,
+      ObjectId newCommit,
+      @Nullable Integer parentNum,
+      String fileName,
+      @Nullable DiffPreferencesInfo.Whitespace whitespace)
       throws DiffNotAvailableException;
 
   /**
    * Returns the diff for a single file between two patchset commits. For deleted files, the {@code
-   * fileName} parameter should contain the old name of the file.
+   * fileName} parameter should contain the old name of the file. This method will return {@link
+   * FileDiffOutput#empty(String)} if the requested file identified by {@code fileName} has
+   * unchanged content or does not exist at both commits.
    *
    * @param project a project name representing a git repository.
    * @param oldCommit 20 bytes SHA-1 of the old commit used in the diff.
    * @param newCommit 20 bytes SHA-1 of the new commit used in the diff.
    * @param fileName the file name for which the diff should be evaluated.
+   * @param whitespace preference controlling whitespace effect in diff computation.
    * @return the diff for the single file between the two commits.
    * @throws DiffNotAvailableException if an internal error occurred in Git while evaluating the
    *     diff.
    */
   FileDiffOutput getModifiedFile(
-      Project.NameKey project, ObjectId oldCommit, ObjectId newCommit, String fileName)
+      Project.NameKey project,
+      ObjectId oldCommit,
+      ObjectId newCommit,
+      String fileName,
+      @Nullable DiffPreferencesInfo.Whitespace whitespace)
       throws DiffNotAvailableException;
 }
diff --git a/java/com/google/gerrit/server/patch/DiffOperationsImpl.java b/java/com/google/gerrit/server/patch/DiffOperationsImpl.java
index 2d98d42..16bd135 100644
--- a/java/com/google/gerrit/server/patch/DiffOperationsImpl.java
+++ b/java/com/google/gerrit/server/patch/DiffOperationsImpl.java
@@ -25,6 +25,7 @@
 import com.google.gerrit.entities.Patch;
 import com.google.gerrit.entities.Patch.ChangeType;
 import com.google.gerrit.entities.Project;
+import com.google.gerrit.extensions.client.DiffPreferencesInfo;
 import com.google.gerrit.extensions.client.DiffPreferencesInfo.Whitespace;
 import com.google.gerrit.server.cache.CacheModule;
 import com.google.gerrit.server.patch.diff.ModifiedFilesCache;
@@ -55,6 +56,7 @@
 
   private static final int RENAME_SCORE = 60;
   private static final DiffAlgorithm DEFAULT_DIFF_ALGORITHM = DiffAlgorithm.HISTOGRAM;
+  private static final Whitespace DEFAULT_WHITESPACE = Whitespace.IGNORE_NONE;
 
   private final ModifiedFilesCache modifiedFilesCache;
   private final FileDiffCache fileDiffCache;
@@ -112,13 +114,18 @@
 
   @Override
   public FileDiffOutput getModifiedFileAgainstParent(
-      Project.NameKey project, ObjectId newCommit, @Nullable Integer parent, String fileName)
+      Project.NameKey project,
+      ObjectId newCommit,
+      @Nullable Integer parent,
+      String fileName,
+      @Nullable DiffPreferencesInfo.Whitespace whitespace)
       throws DiffNotAvailableException {
     try {
       DiffParameters diffParams = computeDiffParameters(project, newCommit, parent);
       FileDiffCacheKey key =
-          createFileDiffCacheKey(project, diffParams.baseCommit(), newCommit, fileName);
-      return getModifiedFilesForKeys(ImmutableList.of(key)).get(fileName);
+          createFileDiffCacheKey(project, diffParams.baseCommit(), newCommit, fileName, whitespace);
+      Map<String, FileDiffOutput> result = getModifiedFilesForKeys(ImmutableList.of(key));
+      return result.containsKey(fileName) ? result.get(fileName) : FileDiffOutput.empty(fileName);
     } catch (IOException e) {
       throw new DiffNotAvailableException(
           "Failed to evaluate the parent/base commit for commit " + newCommit, e);
@@ -127,10 +134,16 @@
 
   @Override
   public FileDiffOutput getModifiedFile(
-      Project.NameKey project, ObjectId oldCommit, ObjectId newCommit, String fileName)
+      Project.NameKey project,
+      ObjectId oldCommit,
+      ObjectId newCommit,
+      String fileName,
+      @Nullable DiffPreferencesInfo.Whitespace whitespace)
       throws DiffNotAvailableException {
-    FileDiffCacheKey key = createFileDiffCacheKey(project, oldCommit, newCommit, fileName);
-    return getModifiedFilesForKeys(ImmutableList.of(key)).get(fileName);
+    FileDiffCacheKey key =
+        createFileDiffCacheKey(project, oldCommit, newCommit, fileName, whitespace);
+    Map<String, FileDiffOutput> result = getModifiedFilesForKeys(ImmutableList.of(key));
+    return result.containsKey(fileName) ? result.get(fileName) : FileDiffOutput.empty(fileName);
   }
 
   private Map<String, FileDiffOutput> getModifiedFiles(
@@ -144,10 +157,14 @@
           modifiedFilesCache.get(createModifiedFilesKey(project, oldCommit, newCommit));
 
       List<FileDiffCacheKey> fileCacheKeys = new ArrayList<>();
-      fileCacheKeys.add(createFileDiffCacheKey(project, oldCommit, newCommit, COMMIT_MSG));
+      fileCacheKeys.add(
+          createFileDiffCacheKey(
+              project, oldCommit, newCommit, COMMIT_MSG, /* whitespace= */ null));
 
       if (cmp.isAgainstAutoMerge() || isMergeAgainstParent(cmp, project, newCommit)) {
-        fileCacheKeys.add(createFileDiffCacheKey(project, oldCommit, newCommit, MERGE_LIST));
+        fileCacheKeys.add(
+            createFileDiffCacheKey(
+                project, oldCommit, newCommit, MERGE_LIST, /*whitespace = */ null));
       }
 
       if (diffParams.skipFiles() == null) {
@@ -160,7 +177,8 @@
                         newCommit,
                         entity.newPath().isPresent()
                             ? entity.newPath().get()
-                            : entity.oldPath().get()))
+                            : entity.oldPath().get(),
+                        /* whitespace= */ null))
             .forEach(fileCacheKeys::add);
       }
       return getModifiedFilesForKeys(fileCacheKeys);
@@ -178,7 +196,7 @@
       if (fileDiffOutput.isEmpty() || allDueToRebase(fileDiffOutput)) {
         continue;
       }
-      if (fileDiffOutput.changeType().get() == Patch.ChangeType.DELETED) {
+      if (fileDiffOutput.changeType() == ChangeType.DELETED) {
         files.put(fileDiffOutput.oldPath().get(), fileDiffOutput);
       } else {
         files.put(fileDiffOutput.newPath().get(), fileDiffOutput);
@@ -189,8 +207,8 @@
 
   private static boolean allDueToRebase(FileDiffOutput fileDiffOutput) {
     return fileDiffOutput.allEditsDueToRebase()
-        && (!(fileDiffOutput.changeType().get() == ChangeType.RENAMED
-            || fileDiffOutput.changeType().get() == ChangeType.COPIED));
+        && (!(fileDiffOutput.changeType() == ChangeType.RENAMED
+            || fileDiffOutput.changeType() == ChangeType.COPIED));
   }
 
   private boolean isMergeAgainstParent(ComparisonType cmp, Project.NameKey project, ObjectId commit)
@@ -209,7 +227,12 @@
   }
 
   private static FileDiffCacheKey createFileDiffCacheKey(
-      Project.NameKey project, ObjectId aCommit, ObjectId bCommit, String newPath) {
+      Project.NameKey project,
+      ObjectId aCommit,
+      ObjectId bCommit,
+      String newPath,
+      @Nullable Whitespace whitespace) {
+    whitespace = whitespace == null ? DEFAULT_WHITESPACE : whitespace;
     return FileDiffCacheKey.builder()
         .project(project)
         .oldCommit(aCommit)
@@ -217,7 +240,7 @@
         .newFilePath(newPath)
         .renameScore(RENAME_SCORE)
         .diffAlgorithm(DEFAULT_DIFF_ALGORITHM)
-        .whitespace(Whitespace.IGNORE_NONE)
+        .whitespace(whitespace)
         .build();
   }
 
diff --git a/java/com/google/gerrit/server/patch/filediff/FileDiffCacheImpl.java b/java/com/google/gerrit/server/patch/filediff/FileDiffCacheImpl.java
index d945da3..63f311b 100644
--- a/java/com/google/gerrit/server/patch/filediff/FileDiffCacheImpl.java
+++ b/java/com/google/gerrit/server/patch/filediff/FileDiffCacheImpl.java
@@ -31,6 +31,7 @@
 import com.google.gerrit.extensions.client.DiffPreferencesInfo.Whitespace;
 import com.google.gerrit.server.cache.CacheModule;
 import com.google.gerrit.server.git.GitRepositoryManager;
+import com.google.gerrit.server.patch.AutoMerger;
 import com.google.gerrit.server.patch.ComparisonType;
 import com.google.gerrit.server.patch.DiffNotAvailableException;
 import com.google.gerrit.server.patch.DiffUtil;
@@ -184,7 +185,8 @@
       return result.build();
     }
 
-    private ComparisonType getComparisonType(RevWalk rw, ObjectId oldCommitId, ObjectId newCommitId)
+    private ComparisonType getComparisonType(
+        RevWalk rw, ObjectReader reader, ObjectId oldCommitId, ObjectId newCommitId)
         throws IOException {
       RevCommit oldCommit = DiffUtil.getRevCommit(rw, oldCommitId);
       RevCommit newCommit = DiffUtil.getRevCommit(rw, newCommitId);
@@ -193,7 +195,16 @@
           return ComparisonType.againstParent(i + 1);
         }
       }
-      if (newCommit.getParentCount() > 0) {
+      // TODO(ghareeb): it's not trivial to distinguish if diff with old commit is against another
+      // patchset or auto-merge. Looking at the commit message of old commit gives a strong
+      // signal that we are diffing against auto-merge, though not 100% accurate (e.g. if old commit
+      // has the auto-merge prefix in the commit message). A better resolution would be to move the
+      // COMMIT_MSG and MERGE_LIST evaluations outside of the diff cache. For more details, see
+      // discussion in
+      // https://gerrit-review.googlesource.com/c/gerrit/+/280519/6..18/java/com/google/gerrit/server/patch/FileDiffCache.java#b540
+      Text oldCommitMsgTxt = Text.forCommit(reader, oldCommit);
+      if (oldCommitMsgTxt.size() > 0
+          && oldCommitMsgTxt.getString(0).startsWith(AutoMerger.AUTO_MERGE_MSG_PREFIX)) {
         return ComparisonType.againstAutoMerge();
       }
       return ComparisonType.againstOtherPatchSet();
@@ -206,7 +217,8 @@
         FileDiffCacheKey key, ObjectReader reader, RevWalk rw, MagicPath magicPath) {
       try {
         RawTextComparator cmp = comparatorFor(key.whitespace());
-        ComparisonType comparisonType = getComparisonType(rw, key.oldCommit(), key.newCommit());
+        ComparisonType comparisonType =
+            getComparisonType(rw, reader, key.oldCommit(), key.newCommit());
         RevCommit aCommit =
             comparisonType.isAgainstParentOrAutoMerge()
                 ? null
@@ -288,7 +300,7 @@
       return FileDiffOutput.builder()
           .oldPath(FileHeaderUtil.getOldPath(fileHeader))
           .newPath(FileHeaderUtil.getNewPath(fileHeader))
-          .changeType(Optional.of(changeType))
+          .changeType(changeType)
           .patchType(Optional.of(FileHeaderUtil.getPatchType(fileHeader)))
           .headerLines(FileHeaderUtil.getHeaderLines(fileHeader))
           .edits(
@@ -342,7 +354,7 @@
         GitFileDiff mainGitDiff = allDiffs.mainDiff().gitDiff();
 
         Long oldSize =
-            mainGitDiff.oldPath().isPresent()
+            mainGitDiff.oldMode().isPresent() && mainGitDiff.oldPath().isPresent()
                 ? new FileSizeEvaluator(reader, aTree)
                     .compute(
                         mainGitDiff.oldId(),
@@ -350,7 +362,7 @@
                         mainGitDiff.oldPath().get())
                 : 0;
         Long newSize =
-            mainGitDiff.newPath().isPresent()
+            mainGitDiff.newMode().isPresent() && mainGitDiff.newPath().isPresent()
                 ? new FileSizeEvaluator(reader, bTree)
                     .compute(
                         mainGitDiff.newId(),
diff --git a/java/com/google/gerrit/server/patch/filediff/FileDiffOutput.java b/java/com/google/gerrit/server/patch/filediff/FileDiffOutput.java
index 46ce28b..3348033 100644
--- a/java/com/google/gerrit/server/patch/filediff/FileDiffOutput.java
+++ b/java/com/google/gerrit/server/patch/filediff/FileDiffOutput.java
@@ -47,7 +47,7 @@
   public abstract Optional<String> newPath();
 
   /** The change type of the underlying file, e.g. added, deleted, renamed, etc... */
-  public abstract Optional<Patch.ChangeType> changeType();
+  public abstract Patch.ChangeType changeType();
 
   /** The patch type of the underlying file, e.g. unified, binary , etc... */
   public abstract Optional<Patch.PatchType> patchType();
@@ -95,10 +95,11 @@
   }
 
   /** Returns an entity representing an unchanged file between two commits. */
-  static FileDiffOutput empty(String filePath) {
+  public static FileDiffOutput empty(String filePath) {
     return builder()
         .oldPath(Optional.empty())
         .newPath(Optional.of(filePath))
+        .changeType(ChangeType.MODIFIED)
         .headerLines(ImmutableList.of())
         .edits(ImmutableList.of())
         .size(0)
@@ -123,9 +124,7 @@
     if (newPath().isPresent()) {
       result += stringSize(newPath().get());
     }
-    if (changeType().isPresent()) {
-      result += 4;
-    }
+    result += 4; // changeType
     if (patchType().isPresent()) {
       result += 4;
     }
@@ -145,7 +144,7 @@
 
     public abstract Builder newPath(Optional<String> value);
 
-    public abstract Builder changeType(Optional<ChangeType> value);
+    public abstract Builder changeType(ChangeType value);
 
     public abstract Builder patchType(Optional<PatchType> value);
 
@@ -169,9 +168,6 @@
     private static final FieldDescriptor NEW_PATH_DESCRIPTOR =
         FileDiffOutputProto.getDescriptor().findFieldByNumber(2);
 
-    private static final FieldDescriptor CHANGE_TYPE_DESCRIPTOR =
-        FileDiffOutputProto.getDescriptor().findFieldByNumber(3);
-
     private static final FieldDescriptor PATCH_TYPE_DESCRIPTOR =
         FileDiffOutputProto.getDescriptor().findFieldByNumber(4);
 
@@ -182,6 +178,7 @@
               .setSize(fileDiff.size())
               .setSizeDelta(fileDiff.sizeDelta())
               .addAllHeaderLines(fileDiff.headerLines())
+              .setChangeType(fileDiff.changeType().name())
               .addAllEdits(
                   fileDiff.edits().stream()
                       .map(
@@ -206,10 +203,6 @@
         builder.setNewPath(fileDiff.newPath().get());
       }
 
-      if (fileDiff.changeType().isPresent()) {
-        builder.setChangeType(fileDiff.changeType().get().name());
-      }
-
       if (fileDiff.patchType().isPresent()) {
         builder.setPatchType(fileDiff.patchType().get().name());
       }
@@ -225,6 +218,7 @@
           .size(proto.getSize())
           .sizeDelta(proto.getSizeDelta())
           .headerLines(proto.getHeaderLinesList().stream().collect(ImmutableList.toImmutableList()))
+          .changeType(ChangeType.valueOf(proto.getChangeType()))
           .edits(
               proto.getEditsList().stream()
                   .map(
@@ -244,9 +238,6 @@
       if (proto.hasField(NEW_PATH_DESCRIPTOR)) {
         builder.newPath(Optional.of(proto.getNewPath()));
       }
-      if (proto.hasField(CHANGE_TYPE_DESCRIPTOR)) {
-        builder.changeType(Optional.of(Patch.ChangeType.valueOf(proto.getChangeType())));
-      }
       if (proto.hasField(PATCH_TYPE_DESCRIPTOR)) {
         builder.patchType(Optional.of(Patch.PatchType.valueOf(proto.getPatchType())));
       }
diff --git a/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiff.java b/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiff.java
index 81c0e5d..a01d447 100644
--- a/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiff.java
+++ b/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiff.java
@@ -77,7 +77,7 @@
         .fileHeader(FileHeaderUtil.toString(fileHeader))
         .oldPath(FileHeaderUtil.getOldPath(fileHeader))
         .newPath(FileHeaderUtil.getNewPath(fileHeader))
-        .changeType(Optional.of(FileHeaderUtil.getChangeType(fileHeader)))
+        .changeType(FileHeaderUtil.getChangeType(fileHeader))
         .patchType(Optional.of(FileHeaderUtil.getPatchType(fileHeader)))
         .oldMode(Optional.of(mapFileMode(diffEntry.getOldMode())))
         .newMode(Optional.of(mapFileMode(diffEntry.getNewMode())))
@@ -96,6 +96,7 @@
         .oldId(oldId)
         .newId(newId)
         .newPath(Optional.of(newFilePath))
+        .changeType(ChangeType.MODIFIED)
         .edits(ImmutableList.of())
         .fileHeader("")
         .build();
@@ -126,7 +127,7 @@
   public abstract Optional<Patch.FileMode> newMode();
 
   /** The change type associated with the file. */
-  public abstract Optional<ChangeType> changeType();
+  public abstract ChangeType changeType();
 
   /** The patch type associated with the file. */
   public abstract Optional<PatchType> patchType();
@@ -150,9 +151,7 @@
     if (newPath().isPresent()) {
       result += stringSize(newPath().get());
     }
-    if (changeType().isPresent()) {
-      result += 4;
-    }
+    result += 4;
     if (patchType().isPresent()) {
       result += 4;
     }
@@ -188,7 +187,7 @@
 
     public abstract Builder newMode(Optional<Patch.FileMode> value);
 
-    public abstract Builder changeType(Optional<ChangeType> value);
+    public abstract Builder changeType(ChangeType value);
 
     public abstract Builder patchType(Optional<PatchType> value);
 
@@ -223,7 +222,8 @@
           GitFileDiffProto.newBuilder()
               .setFileHeader(gitFileDiff.fileHeader())
               .setOldId(idConverter.toByteString(gitFileDiff.oldId().toObjectId()))
-              .setNewId(idConverter.toByteString(gitFileDiff.newId().toObjectId()));
+              .setNewId(idConverter.toByteString(gitFileDiff.newId().toObjectId()))
+              .setChangeType(gitFileDiff.changeType().name());
       gitFileDiff
           .edits()
           .forEach(
@@ -246,9 +246,6 @@
       if (gitFileDiff.newMode().isPresent()) {
         builder.setNewMode(gitFileDiff.newMode().get().name());
       }
-      if (gitFileDiff.changeType().isPresent()) {
-        builder.setChangeType(gitFileDiff.changeType().get().name());
-      }
       if (gitFileDiff.patchType().isPresent()) {
         builder.setPatchType(gitFileDiff.patchType().get().name());
       }
@@ -267,7 +264,8 @@
                   .collect(toImmutableList()))
           .fileHeader(proto.getFileHeader())
           .oldId(AbbreviatedObjectId.fromObjectId(idConverter.fromByteString(proto.getOldId())))
-          .newId(AbbreviatedObjectId.fromObjectId(idConverter.fromByteString(proto.getNewId())));
+          .newId(AbbreviatedObjectId.fromObjectId(idConverter.fromByteString(proto.getNewId())))
+          .changeType(ChangeType.valueOf(proto.getChangeType()));
 
       if (proto.hasField(OLD_PATH_DESCRIPTOR)) {
         builder.oldPath(Optional.of(proto.getOldPath()));
@@ -281,9 +279,6 @@
       if (proto.hasField(NEW_MODE_DESCRIPTOR)) {
         builder.newMode(Optional.of(Patch.FileMode.valueOf(proto.getNewMode())));
       }
-      if (proto.hasField(CHANGE_TYPE_DESCRIPTOR)) {
-        builder.changeType(Optional.of(Patch.ChangeType.valueOf(proto.getChangeType())));
-      }
       if (proto.hasField(PATCH_TYPE_DESCRIPTOR)) {
         builder.patchType(Optional.of(Patch.PatchType.valueOf(proto.getPatchType())));
       }
diff --git a/java/com/google/gerrit/server/permissions/DefaultRefFilter.java b/java/com/google/gerrit/server/permissions/DefaultRefFilter.java
index 88f91be..5092e12 100644
--- a/java/com/google/gerrit/server/permissions/DefaultRefFilter.java
+++ b/java/com/google/gerrit/server/permissions/DefaultRefFilter.java
@@ -50,9 +50,7 @@
 import java.util.stream.Collectors;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.Constants;
-import org.eclipse.jgit.lib.ObjectIdRef;
 import org.eclipse.jgit.lib.Ref;
-import org.eclipse.jgit.lib.Ref.Storage;
 import org.eclipse.jgit.lib.Repository;
 
 class DefaultRefFilter {
@@ -129,15 +127,6 @@
         "Project state %s permits read = %s",
         projectState.getProject().getState(), projectState.statePermitsRead());
 
-    // If we anyway always return all available (most recent) changes in the change index and cache,
-    // we shouldn't care about refs/changes.
-    if (opts.returnMostRecentRefChanges()) {
-      refs =
-          refs.stream()
-              .filter(r -> !RefNames.isRefsChanges(r.getName()))
-              .collect(Collectors.toList());
-    }
-
     // See if we can get away with a single, cheap ref evaluation.
     if (refs.size() == 1) {
       String refName = Iterables.getOnlyElement(refs).getName();
@@ -145,7 +134,7 @@
         logger.atFinest().log("Filter out metadata ref %s", refName);
         return ImmutableList.of();
       }
-      if (RefNames.isRefsChanges(refName) && !opts.returnMostRecentRefChanges()) {
+      if (RefNames.isRefsChanges(refName)) {
         boolean isChangeRefVisisble = canSeeSingleChangeRef(refName);
         if (isChangeRefVisisble) {
           logger.atFinest().log("Change ref %s is visible", refName);
@@ -188,46 +177,10 @@
       }
     }
 
-    if (opts.returnMostRecentRefChanges()) {
-      visibleChangesCache.cachedVisibleChanges().keySet().stream()
-          .forEach(c -> addAllChangeAndPatchsetRefs(visibleRefs, c));
-    }
-
     logger.atFinest().log("visible refs = %s", visibleRefs);
     return visibleRefs;
   }
 
-  private void addAllChangeAndPatchsetRefs(Collection<Ref> refs, Change.Id changeId) {
-    try {
-      refs.add(
-          new ObjectIdRef.PeeledNonTag(
-              Storage.PACKED,
-              RefNames.changeMetaRef(changeId),
-              visibleChangesCache.getMetaId(changeId)));
-      visibleChangesCache
-          .getPatchSets(changeId)
-          .forEach(
-              p ->
-                  refs.add(
-                      new ObjectIdRef.PeeledNonTag(
-                          Storage.PACKED, RefNames.patchSetRef(p.id()), p.commitId())));
-      if (visibleChangesCache.getRobotCommentsMetaId(changeId) != null) {
-        refs.add(
-            new ObjectIdRef.PeeledNonTag(
-                Storage.PACKED,
-                RefNames.robotCommentsRef(changeId),
-                visibleChangesCache.getRobotCommentsMetaId(changeId)));
-      }
-    } catch (PermissionBackendException ex) {
-      // this can't happen since the changes are all already in the cache, so we don't need to
-      // perform permission checks at all to get those changes.
-      throw new IllegalStateException(
-          "this shouldn't happen since all permission checks should have been "
-              + "done previously, exception: %s",
-          ex);
-    }
-  }
-
   /**
    * Filters refs by visibility. Returns tags where visibility can't be trivially computed
    * separately for later rev-walk-based visibility computation. Tags where visibility is trivial to
@@ -366,7 +319,7 @@
       try {
         // Default to READ_PRIVATE_CHANGES as there is no special permission for reading edits.
         permissionBackendForProject
-            .ref(visibleChangesCache.getChange(id).getDest().branch())
+            .ref(visibleChangesCache.getBranchNameKey(id).branch())
             .check(RefPermission.READ_PRIVATE_CHANGES);
         logger.atFinest().log("Foreign change edit ref is visible: %s", name);
         return true;
diff --git a/java/com/google/gerrit/server/permissions/PermissionBackend.java b/java/com/google/gerrit/server/permissions/PermissionBackend.java
index 6b50228..27c6793 100644
--- a/java/com/google/gerrit/server/permissions/PermissionBackend.java
+++ b/java/com/google/gerrit/server/permissions/PermissionBackend.java
@@ -330,13 +330,6 @@
     public abstract boolean filterMeta();
 
     /**
-     * Return all of the visible change refs that are available in the change index (which are the
-     * most recent changes), even if they are not part of the List<Ref> passed. This allows the
-     * caller not to send all the refs/changes.
-     */
-    public abstract boolean returnMostRecentRefChanges();
-
-    /**
      * Select only refs with names matching prefixes per {@link
      * org.eclipse.jgit.lib.RefDatabase#getRefsByPrefix}.
      */
@@ -347,7 +340,6 @@
     public static Builder builder() {
       return new AutoValue_PermissionBackend_RefFilterOptions.Builder()
           .setFilterMeta(false)
-          .setReturnMostRecentRefChanges(false)
           .setPrefixes(Collections.singletonList(""));
     }
 
@@ -355,8 +347,6 @@
     public abstract static class Builder {
       public abstract Builder setFilterMeta(boolean val);
 
-      public abstract Builder setReturnMostRecentRefChanges(boolean val);
-
       public abstract Builder setPrefixes(List<String> prefixes);
 
       public abstract RefFilterOptions build();
diff --git a/java/com/google/gerrit/server/permissions/VisibleChangesCache.java b/java/com/google/gerrit/server/permissions/VisibleChangesCache.java
index 926dde6..2e47576 100644
--- a/java/com/google/gerrit/server/permissions/VisibleChangesCache.java
+++ b/java/com/google/gerrit/server/permissions/VisibleChangesCache.java
@@ -16,18 +16,14 @@
 
 import static com.google.common.collect.ImmutableList.toImmutableList;
 
-import com.google.common.collect.HashMultimap;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.Multimap;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
+import com.google.gerrit.entities.BranchNameKey;
 import com.google.gerrit.entities.Change;
-import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.Project;
-import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.extensions.restapi.AuthException;
-import com.google.gerrit.index.RefState;
 import com.google.gerrit.server.git.SearchingChangeCacheImpl;
 import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.notedb.ChangeNotes.Factory.ChangeNotesResult;
@@ -36,10 +32,8 @@
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
 import java.io.IOException;
-import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
-import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Repository;
 
 /**
@@ -59,10 +53,7 @@
   private final PermissionBackend.ForProject permissionBackendForProject;
 
   private final Repository repository;
-  private Map<Change.Id, Change> visibleChanges;
-  private Map<Change.Id, ObjectId> metaIds = new HashMap<>();
-  private Map<Change.Id, ObjectId> robotCommentsMetaIds = new HashMap<>();
-  private Multimap<Change.Id, PatchSet> patchSets = HashMultimap.create();
+  private Map<Change.Id, BranchNameKey> visibleChanges;
 
   @Inject
   VisibleChangesCache(
@@ -92,7 +83,7 @@
    * Returns the visible changes in the repository {@code repo}. If not cached, computes the visible
    * changes and caches them.
    */
-  public Map<Change.Id, Change> cachedVisibleChanges() throws PermissionBackendException {
+  public Map<Change.Id, BranchNameKey> cachedVisibleChanges() throws PermissionBackendException {
     if (visibleChanges == null) {
       if (changeCache == null) {
         visibleChangesByScan();
@@ -105,46 +96,15 @@
   }
 
   /**
-   * Returns the change for {@code changeId}. If not cached, computes *all* visible changes and
-   * caches them before returning this specific change. If not visible or not found, returns null.
+   * Returns the {@code BranchNameKey} for {@code changeId}. If not cached, computes *all* visible
+   * changes and caches them before returning this specific change. If not visible or not found,
+   * returns {@code null}.
    */
   @Nullable
-  public Change getChange(Change.Id changeId) throws PermissionBackendException {
+  public BranchNameKey getBranchNameKey(Change.Id changeId) throws PermissionBackendException {
     return cachedVisibleChanges().get(changeId);
   }
 
-  /**
-   * Returns the change's meta id for {@code changeId}. If not cached, computes *all* visible
-   * changes and caches them before returning this specific meta id. If not visible or not found,
-   * returns null.
-   */
-  @Nullable
-  public ObjectId getMetaId(Change.Id changeId) throws PermissionBackendException {
-    cachedVisibleChanges();
-    return metaIds.get(changeId);
-  }
-
-  /**
-   * Returns the change's robot comment meta id for {@code changeId}. If not cached, computes *all*
-   * visible changes and caches them before returning this specific robot comments meta id. If not
-   * visible, not found or there are no robot comments on this change, returns null.
-   */
-  @Nullable
-  public ObjectId getRobotCommentsMetaId(Change.Id changeId) throws PermissionBackendException {
-    cachedVisibleChanges();
-    return robotCommentsMetaIds.get(changeId);
-  }
-
-  /**
-   * Returns the change's patch-sets for {@code changeId}. If not cached, computes *all* visible
-   * changes and caches them before returning this collection of patch-sets. If not visible or not
-   * found, returns an empty collection.
-   */
-  public Collection<PatchSet> getPatchSets(Change.Id changeId) throws PermissionBackendException {
-    cachedVisibleChanges();
-    return patchSets.get(changeId);
-  }
-
   private void visibleChangesBySearch() throws PermissionBackendException {
     visibleChanges = new HashMap<>();
     Project.NameKey project = projectState.getNameKey();
@@ -155,20 +115,7 @@
         }
         try {
           permissionBackendForProject.change(cd).check(ChangePermission.READ);
-          visibleChanges.put(cd.getId(), cd.change());
-          Collection<RefState> refStates = RefState.parseStates(cd.getRefStates()).values();
-          for (RefState refState : refStates) {
-            if (RefNames.isRobotCommentMetaRef(refState.ref())) {
-              if (!refState.id().equals(ObjectId.zeroId())) {
-                robotCommentsMetaIds.put(cd.getId(), refState.id());
-              }
-            }
-            if (RefNames.isRefsMetaChanges(refState.ref())) {
-              metaIds.put(cd.getId(), refState.id());
-            }
-          }
-          cd.patchSets().stream().forEach(ps -> patchSets.put(cd.getId(), ps));
-
+          visibleChanges.put(cd.getId(), cd.change().getDest());
         } catch (AuthException e) {
           // Do nothing.
         }
@@ -194,14 +141,7 @@
     for (ChangeNotesResult notesResult : changes) {
       ChangeNotes notes = toNotes(notesResult);
       if (notes != null) {
-        visibleChanges.put(notes.getChangeId(), notes.getChange());
-        metaIds.put(notes.getChangeId(), notes.getMetaId());
-        if (notes.getRobotCommentNotes() != null
-            && notes.getRobotCommentNotes().getMetaId() != null) {
-          robotCommentsMetaIds.put(notes.getChangeId(), notes.getRobotCommentNotes().getMetaId());
-        }
-        notes.getPatchSets().values().stream()
-            .forEach(ps -> patchSets.put(notes.getChangeId(), ps));
+        visibleChanges.put(notes.getChangeId(), notes.getChange().getDest());
       }
     }
   }
diff --git a/java/com/google/gerrit/server/project/testing/BUILD b/java/com/google/gerrit/server/project/testing/BUILD
index 3112b5a..ab75ec7 100644
--- a/java/com/google/gerrit/server/project/testing/BUILD
+++ b/java/com/google/gerrit/server/project/testing/BUILD
@@ -5,8 +5,5 @@
     testonly = True,
     srcs = glob(["*.java"]),
     visibility = ["//visibility:public"],
-    deps = [
-        "//java/com/google/gerrit/common:server",
-        "//java/com/google/gerrit/entities",
-    ],
+    deps = ["//java/com/google/gerrit/entities"],
 )
diff --git a/java/com/google/gerrit/server/query/change/ChangeData.java b/java/com/google/gerrit/server/query/change/ChangeData.java
index 6de263e..05ecc61 100644
--- a/java/com/google/gerrit/server/query/change/ChangeData.java
+++ b/java/com/google/gerrit/server/query/change/ChangeData.java
@@ -26,13 +26,16 @@
 import com.google.common.collect.ImmutableListMultimap;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.ImmutableSetMultimap;
 import com.google.common.collect.ImmutableSortedSet;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.ListMultimap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
+import com.google.common.collect.SetMultimap;
 import com.google.common.primitives.Ints;
 import com.google.gerrit.common.Nullable;
+import com.google.gerrit.common.UsedAt;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.AttentionSetUpdate;
 import com.google.gerrit.entities.Change;
@@ -43,6 +46,7 @@
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.PatchSetApproval;
 import com.google.gerrit.entities.Project;
+import com.google.gerrit.entities.Project.NameKey;
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.entities.RobotComment;
 import com.google.gerrit.entities.SubmitRecord;
@@ -50,6 +54,7 @@
 import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
+import com.google.gerrit.index.RefState;
 import com.google.gerrit.server.ApprovalsUtil;
 import com.google.gerrit.server.ChangeMessagesUtil;
 import com.google.gerrit.server.CommentsUtil;
@@ -69,6 +74,7 @@
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.MergeUtil;
 import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.notedb.RobotCommentNotes;
 import com.google.gerrit.server.patch.DiffSummary;
 import com.google.gerrit.server.patch.DiffSummaryKey;
 import com.google.gerrit.server.patch.PatchListCache;
@@ -308,7 +314,7 @@
   private Integer totalCommentCount;
   private LabelTypes labelTypes;
   private Optional<Timestamp> mergedOn;
-  private ImmutableList<byte[]> refStates;
+  private ImmutableSetMultimap<NameKey, RefState> refStates;
   private ImmutableList<byte[]> refStatePatterns;
 
   @Inject
@@ -1169,12 +1175,38 @@
     }
   }
 
-  public ImmutableList<byte[]> getRefStates() {
+  public SetMultimap<NameKey, RefState> getRefStates() {
+    if (refStates == null) {
+      if (!lazyLoad) {
+        return ImmutableSetMultimap.of();
+      }
+
+      ImmutableSetMultimap.Builder<NameKey, RefState> result = ImmutableSetMultimap.builder();
+      editRefs().values().forEach(r -> result.put(project, RefState.of(r)));
+      starRefs().values().forEach(r -> result.put(allUsersName, RefState.of(r.ref())));
+
+      // TODO: instantiating the notes is too much. We don't want to parse NoteDb, we just want the
+      // refs.
+      result.put(project, RefState.create(notes().getRefName(), notes().getMetaId()));
+      notes().getRobotComments(); // Force loading robot comments.
+      RobotCommentNotes robotNotes = notes().getRobotCommentNotes();
+      result.put(project, RefState.create(robotNotes.getRefName(), robotNotes.getMetaId()));
+      draftRefs().values().forEach(r -> result.put(allUsersName, RefState.of(r)));
+
+      refStates = result.build();
+    }
+
     return refStates;
   }
 
+  @UsedAt(UsedAt.Project.GOOGLE)
   public void setRefStates(Iterable<byte[]> refStates) {
-    this.refStates = ImmutableList.copyOf(refStates);
+    // TODO(hanwen): remove Google use, and drop this method.
+    setRefStates(RefState.parseStates(refStates));
+  }
+
+  public void setRefStates(ImmutableSetMultimap<Project.NameKey, RefState> refStates) {
+    this.refStates = refStates;
   }
 
   public ImmutableList<byte[]> getRefStatePatterns() {
diff --git a/java/com/google/gerrit/server/restapi/BUILD b/java/com/google/gerrit/server/restapi/BUILD
index 3cb0796..6d3e222 100644
--- a/java/com/google/gerrit/server/restapi/BUILD
+++ b/java/com/google/gerrit/server/restapi/BUILD
@@ -8,7 +8,6 @@
     name = "restapi",
     srcs = glob(["**/*.java"]),
     deps = [
-        "//java/com/google/gerrit/auth",
         "//java/com/google/gerrit/common:annotations",
         "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
@@ -19,13 +18,11 @@
         "//java/com/google/gerrit/index:query_exception",
         "//java/com/google/gerrit/index/project",
         "//java/com/google/gerrit/json",
-        "//java/com/google/gerrit/mail",
         "//java/com/google/gerrit/metrics",
         "//java/com/google/gerrit/server",
         "//java/com/google/gerrit/server/ioutil",
         "//java/com/google/gerrit/server/logging",
         "//java/com/google/gerrit/server/util/time",
-        "//java/com/google/gerrit/util/cli",
         "//lib:args4j",
         "//lib:blame-cache",
         "//lib:gson",
diff --git a/java/com/google/gerrit/server/restapi/change/DeleteAssignee.java b/java/com/google/gerrit/server/restapi/change/DeleteAssignee.java
index 20fd675..842ed2a 100644
--- a/java/com/google/gerrit/server/restapi/change/DeleteAssignee.java
+++ b/java/com/google/gerrit/server/restapi/change/DeleteAssignee.java
@@ -93,10 +93,7 @@
       }
       IdentifiedUser deletedAssigneeUser = userFactory.create(currentAssigneeId);
       deletedAssignee = deletedAssigneeUser.state();
-      // noteDb
       update.removeAssignee();
-      // reviewDb
-      change.setAssignee(null);
       addMessage(ctx, update, deletedAssigneeUser);
       return true;
     }
diff --git a/java/com/google/gerrit/server/restapi/change/GetChange.java b/java/com/google/gerrit/server/restapi/change/GetChange.java
index f28d2b3..2f1c61e 100644
--- a/java/com/google/gerrit/server/restapi/change/GetChange.java
+++ b/java/com/google/gerrit/server/restapi/change/GetChange.java
@@ -16,12 +16,15 @@
 
 import com.google.common.collect.ImmutableListMultimap;
 import com.google.common.collect.Streams;
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Change;
 import com.google.gerrit.extensions.client.ListChangesOption;
 import com.google.gerrit.extensions.client.ListOption;
 import com.google.gerrit.extensions.common.ChangeInfo;
 import com.google.gerrit.extensions.common.PluginDefinedInfo;
 import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.extensions.restapi.PreconditionFailedException;
 import com.google.gerrit.extensions.restapi.Response;
 import com.google.gerrit.extensions.restapi.RestReadView;
 import com.google.gerrit.server.DynamicOptions;
@@ -31,12 +34,15 @@
 import com.google.gerrit.server.change.ChangeResource;
 import com.google.gerrit.server.change.PluginDefinedAttributesFactories;
 import com.google.gerrit.server.change.RevisionResource;
+import com.google.gerrit.server.notedb.MissingMetaObjectException;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.inject.Inject;
 import java.util.Collection;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.Map;
+import org.eclipse.jgit.errors.InvalidObjectIdException;
+import org.eclipse.jgit.lib.ObjectId;
 import org.kohsuke.args4j.Option;
 
 public class GetChange
@@ -53,6 +59,9 @@
     options.add(o);
   }
 
+  @Option(name = "--meta", usage = "NoteDb meta SHA1")
+  String metaRevId = "";
+
   @Option(name = "-O", usage = "Output option flags, in hex")
   void setOptionFlagsHex(String hex) {
     options.addAll(ListOption.fromBits(ListChangesOption.class, Integer.parseInt(hex, 16)));
@@ -75,14 +84,35 @@
   }
 
   @Override
-  public Response<ChangeInfo> apply(ChangeResource rsrc) {
-    return Response.withMustRevalidate(newChangeJson().format(rsrc));
+  public Response<ChangeInfo> apply(ChangeResource rsrc)
+      throws BadRequestException, PreconditionFailedException {
+    try {
+      return Response.withMustRevalidate(newChangeJson().format(rsrc.getChange(), getMetaRevId()));
+    } catch (MissingMetaObjectException e) {
+      throw new PreconditionFailedException(e.getMessage());
+    }
   }
 
   Response<ChangeInfo> apply(RevisionResource rsrc) {
     return Response.withMustRevalidate(newChangeJson().format(rsrc));
   }
 
+  @Nullable
+  private ObjectId getMetaRevId() throws BadRequestException {
+    if (metaRevId.isEmpty()) {
+      return null;
+    }
+
+    // It might be interesting to also allow {SHA1}^^, so callers can walk back into history
+    // without having to fetch the entire /meta ref. If we do so, we have to be careful that
+    // the error messages can't be abused to fetch hidden data.
+    try {
+      return ObjectId.fromString(metaRevId);
+    } catch (InvalidObjectIdException e) {
+      throw new BadRequestException("invalid meta SHA1: " + metaRevId, e);
+    }
+  }
+
   private ChangeJson newChangeJson() {
     return json.create(options, this::createPluginDefinedInfos);
   }
diff --git a/java/com/google/gerrit/server/restapi/change/GetDetail.java b/java/com/google/gerrit/server/restapi/change/GetDetail.java
index e31d84b..15362d5 100644
--- a/java/com/google/gerrit/server/restapi/change/GetDetail.java
+++ b/java/com/google/gerrit/server/restapi/change/GetDetail.java
@@ -16,6 +16,8 @@
 
 import com.google.gerrit.extensions.client.ListChangesOption;
 import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.extensions.restapi.PreconditionFailedException;
 import com.google.gerrit.extensions.restapi.Response;
 import com.google.gerrit.extensions.restapi.RestReadView;
 import com.google.gerrit.server.DynamicOptions;
@@ -58,7 +60,8 @@
   }
 
   @Override
-  public Response<ChangeInfo> apply(ChangeResource rsrc) {
+  public Response<ChangeInfo> apply(ChangeResource rsrc)
+      throws BadRequestException, PreconditionFailedException {
     return delegate.apply(rsrc);
   }
 }
diff --git a/java/com/google/gerrit/server/restapi/change/GetRevisionActions.java b/java/com/google/gerrit/server/restapi/change/GetRevisionActions.java
index c4da3b6..527129c 100644
--- a/java/com/google/gerrit/server/restapi/change/GetRevisionActions.java
+++ b/java/com/google/gerrit/server/restapi/change/GetRevisionActions.java
@@ -14,67 +14,26 @@
 
 package com.google.gerrit.server.restapi.change;
 
-import com.google.common.hash.Hasher;
-import com.google.common.hash.Hashing;
-import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.extensions.common.ActionInfo;
-import com.google.gerrit.extensions.restapi.ETagView;
 import com.google.gerrit.extensions.restapi.Response;
-import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.extensions.restapi.RestReadView;
 import com.google.gerrit.server.change.ActionJson;
-import com.google.gerrit.server.change.ChangeResource;
 import com.google.gerrit.server.change.RevisionResource;
-import com.google.gerrit.server.config.GerritServerConfig;
-import com.google.gerrit.server.permissions.PermissionBackendException;
-import com.google.gerrit.server.query.change.ChangeData;
-import com.google.gerrit.server.submit.ChangeSet;
-import com.google.gerrit.server.submit.MergeSuperSet;
 import com.google.inject.Inject;
-import com.google.inject.Provider;
 import com.google.inject.Singleton;
-import java.io.IOException;
 import java.util.Map;
-import org.eclipse.jgit.lib.Config;
 
 @Singleton
-public class GetRevisionActions implements ETagView<RevisionResource> {
+public class GetRevisionActions implements RestReadView<RevisionResource> {
   private final ActionJson delegate;
-  private final Config config;
-  private final Provider<MergeSuperSet> mergeSuperSet;
-  private final ChangeResource.Factory changeResourceFactory;
 
   @Inject
-  GetRevisionActions(
-      ActionJson delegate,
-      Provider<MergeSuperSet> mergeSuperSet,
-      ChangeResource.Factory changeResourceFactory,
-      @GerritServerConfig Config config) {
+  GetRevisionActions(ActionJson delegate) {
     this.delegate = delegate;
-    this.mergeSuperSet = mergeSuperSet;
-    this.changeResourceFactory = changeResourceFactory;
-    this.config = config;
   }
 
   @Override
   public Response<Map<String, ActionInfo>> apply(RevisionResource rsrc) {
     return Response.withMustRevalidate(delegate.format(rsrc));
   }
-
-  @Override
-  public String getETag(RevisionResource rsrc) {
-    Hasher h = Hashing.murmur3_128().newHasher();
-    CurrentUser user = rsrc.getUser();
-    try {
-      rsrc.getChangeResource().prepareETag(h, user);
-      h.putBoolean(MergeSuperSet.wholeTopicEnabled(config));
-      ChangeSet cs = mergeSuperSet.get().completeChangeSet(rsrc.getChange(), user);
-      for (ChangeData cd : cs.changes()) {
-        changeResourceFactory.create(cd.notes(), user).prepareETag(h, user);
-      }
-      h.putBoolean(cs.furtherHiddenChanges());
-    } catch (IOException | PermissionBackendException e) {
-      throw new StorageException(e);
-    }
-    return h.hash().toString();
-  }
 }
diff --git a/java/com/google/gerrit/server/restapi/config/GetServerInfo.java b/java/com/google/gerrit/server/restapi/config/GetServerInfo.java
index 780c60a..5459ede 100644
--- a/java/com/google/gerrit/server/restapi/config/GetServerInfo.java
+++ b/java/com/google/gerrit/server/restapi/config/GetServerInfo.java
@@ -222,7 +222,6 @@
     info.showAssigneeInChangesTable =
         toBoolean(
             config.getBoolean("change", "showAssigneeInChangesTable", false) && hasAssigneeInIndex);
-    info.largeChange = config.getInt("change", "largeChange", 500);
     info.replyTooltip =
         Optional.ofNullable(config.getString("change", null, "replyTooltip"))
                 .orElse("Reply and score")
diff --git a/java/com/google/gerrit/server/restapi/project/CreateProject.java b/java/com/google/gerrit/server/restapi/project/CreateProject.java
index a5a0034..faab241 100644
--- a/java/com/google/gerrit/server/restapi/project/CreateProject.java
+++ b/java/com/google/gerrit/server/restapi/project/CreateProject.java
@@ -208,4 +208,18 @@
     }
     return normalizedBranches;
   }
+
+  static class ValidBranchListener implements ProjectCreationValidationListener {
+    @Override
+    public void validateNewProject(CreateProjectArgs args) throws ValidationException {
+      for (String branch : args.branch) {
+        if (RefNames.isGerritRef(branch)) {
+          throw new ValidationException(
+              String.format(
+                  "Cannot create a project with branch %s. Branches in the Gerrit internal refs namespace are not allowed",
+                  branch));
+        }
+      }
+    }
+  }
 }
diff --git a/java/com/google/gerrit/server/restapi/project/Module.java b/java/com/google/gerrit/server/restapi/project/Module.java
index 517b888..9217077 100644
--- a/java/com/google/gerrit/server/restapi/project/Module.java
+++ b/java/com/google/gerrit/server/restapi/project/Module.java
@@ -29,6 +29,7 @@
 import com.google.gerrit.server.config.GerritConfigListener;
 import com.google.gerrit.server.project.RefValidationHelper;
 import com.google.gerrit.server.restapi.change.CherryPickCommit;
+import com.google.gerrit.server.validators.ProjectCreationValidationListener;
 
 public class Module extends RestApiModule {
 
@@ -47,6 +48,8 @@
     DynamicMap.mapOf(binder(), LABEL_KIND);
 
     DynamicSet.bind(binder(), GerritConfigListener.class).to(SetParent.class);
+    DynamicSet.bind(binder(), ProjectCreationValidationListener.class)
+        .to(CreateProject.ValidBranchListener.class);
 
     create(PROJECT_KIND).to(CreateProject.class);
     put(PROJECT_KIND).to(PutProject.class);
diff --git a/java/com/google/gerrit/server/submit/MergeOp.java b/java/com/google/gerrit/server/submit/MergeOp.java
index 7f434ca..871d8d2 100644
--- a/java/com/google/gerrit/server/submit/MergeOp.java
+++ b/java/com/google/gerrit/server/submit/MergeOp.java
@@ -35,6 +35,7 @@
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.BranchNameKey;
 import com.google.gerrit.entities.Change;
+import com.google.gerrit.entities.Change.Status;
 import com.google.gerrit.entities.ChangeMessage;
 import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.Project;
@@ -493,12 +494,29 @@
         logger.atFine().log("Calculated to merge %s", indexBackedChangeSet);
 
         // Reload ChangeSet so that we don't rely on (potentially) stale index data for merging
-        ChangeSet cs = reloadChanges(indexBackedChangeSet);
+        ChangeSet noteDbChangeSet = reloadChanges(indexBackedChangeSet);
+
+        // At this point, any change that isn't new can be filtered out since they were only here
+        // in the first place due to stale index.
+        List<ChangeData> filteredChanges = new ArrayList<>();
+        for (ChangeData changeData : noteDbChangeSet.changes()) {
+          if (!changeData.change().getStatus().equals(Status.NEW)) {
+            logger.atFine().log(
+                "Change %s has status %s due to stale index, so it is skipped during submit",
+                changeData.getId().toString(), changeData.change().getStatus().name());
+            continue;
+          }
+          filteredChanges.add(changeData);
+        }
+
+        // There are no hidden changes (or else we would have thrown AuthException above).
+        ChangeSet filteredNoteDbChangeSet =
+            new ChangeSet(filteredChanges, /* hiddenChanges= */ ImmutableList.of());
 
         // Count cross-project submissions outside of the retry loop. The chance of a single project
         // failing increases with the number of projects, so the failure count would be inflated if
         // this metric were incremented inside of integrateIntoHistory.
-        int projects = cs.projects().size();
+        int projects = filteredNoteDbChangeSet.projects().size();
         if (projects > 1) {
           topicMetrics.topicSubmissions.increment();
         }
@@ -517,22 +535,22 @@
                     this.ts = TimeUtil.nowTs();
                     openRepoManager();
                   }
-                  this.commitStatus = new CommitStatus(cs, isRetry);
+                  this.commitStatus = new CommitStatus(filteredNoteDbChangeSet, isRetry);
                   if (checkSubmitRules) {
                     logger.atFine().log("Checking submit rules and state");
-                    checkSubmitRulesAndState(cs, isRetry);
+                    checkSubmitRulesAndState(filteredNoteDbChangeSet, isRetry);
                   } else {
                     logger.atFine().log("Bypassing submit rules");
-                    bypassSubmitRules(cs, isRetry);
+                    bypassSubmitRules(filteredNoteDbChangeSet, isRetry);
                   }
-                  integrateIntoHistory(cs, submissionExecutor);
+                  integrateIntoHistory(filteredNoteDbChangeSet, submissionExecutor);
                   return null;
                 })
             .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(cs.projects().size())
+            .defaultTimeoutMultiplier(filteredNoteDbChangeSet.projects().size())
             // 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/java/gerrit/BUILD b/java/gerrit/BUILD
index 7dbf751..db831b7 100644
--- a/java/gerrit/BUILD
+++ b/java/gerrit/BUILD
@@ -5,7 +5,6 @@
     srcs = glob(["**/*.java"]),
     visibility = ["//visibility:public"],
     deps = [
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/server",
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/BUILD b/javatests/com/google/gerrit/acceptance/api/revision/BUILD
index 3bfe2f0..517b041 100644
--- a/javatests/com/google/gerrit/acceptance/api/revision/BUILD
+++ b/javatests/com/google/gerrit/acceptance/api/revision/BUILD
@@ -4,4 +4,12 @@
     srcs = [f],
     group = f[:f.index(".")],
     labels = ["api"],
+    deps = [":revision-diff-it"],
 ) for f in glob(["*IT.java"])]
+
+# This is needed because RevisionDiffIT has subclasses that depend on it
+java_library(
+    name = "revision-diff-it",
+    srcs = ["RevisionDiffIT.java"],
+    deps = ["//java/com/google/gerrit/acceptance:lib"],
+)
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIT.java b/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIT.java
index b298497..68bb66c 100644
--- a/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIT.java
@@ -42,7 +42,6 @@
 import com.google.gerrit.extensions.common.FileInfo;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.BinaryResult;
-import com.google.gerrit.testing.ConfigSuite;
 import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -55,7 +54,6 @@
 import java.util.function.Function;
 import java.util.stream.IntStream;
 import javax.imageio.ImageIO;
-import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.revwalk.RevCommit;
@@ -66,7 +64,8 @@
 public class RevisionDiffIT extends AbstractDaemonTest {
   // @RunWith(Parameterized.class) can't be used as AbstractDaemonTest is annotated with another
   // runner. Using different configs is a workaround to achieve the same.
-  private static final String TEST_PARAMETER_MARKER = "test_only_parameter";
+  protected static final String TEST_PARAMETER_MARKER = "test_only_parameter";
+
   private static final String CURRENT = "current";
   private static final String FILE_NAME = "some_file.txt";
   private static final String FILE_NAME2 = "another_file.txt";
@@ -83,20 +82,6 @@
   private String changeId;
   private String initialPatchSetId;
 
-  @ConfigSuite.Config
-  public static Config intralineConfig() {
-    Config config = new Config();
-    config.setBoolean(TEST_PARAMETER_MARKER, null, "intraline", true);
-    return config;
-  }
-
-  @ConfigSuite.Config
-  public static Config newDiffCacheConfig() {
-    Config config = new Config();
-    config.setBoolean("cache", "diff_cache", "useNewDiffCache", true);
-    return config;
-  }
-
   @Before
   public void setUp() throws Exception {
     // Reduce flakiness of tests. (If tests aren't fast enough, we would use a fall-back
@@ -105,7 +90,7 @@
     baseConfig.setString("cache", "diff_intraline", "timeout", "1 minute");
 
     intraline = baseConfig.getBoolean(TEST_PARAMETER_MARKER, "intraline", false);
-    useNewDiffCache = baseConfig.getBoolean("cache", "diff_cache", "useNewDiffCache", true);
+    useNewDiffCache = baseConfig.getBoolean("cache", "diff_cache", "useNewDiffCache", false);
 
     ObjectId headCommit = testRepo.getRepository().resolve("HEAD");
     commit1 =
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIntralineIT.java b/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIntralineIT.java
new file mode 100644
index 0000000..ff4ac8e
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/api/revision/RevisionDiffIntralineIT.java
@@ -0,0 +1,28 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.api.revision;
+
+import com.google.gerrit.testing.ConfigSuite;
+import org.eclipse.jgit.lib.Config;
+
+/** Runs the {@link RevisionDiffIT} tests with the intraline config enabled. */
+public class RevisionDiffIntralineIT extends RevisionDiffIT {
+  @ConfigSuite.Default
+  public static Config intralineConfig() {
+    Config config = new Config();
+    config.setBoolean(TEST_PARAMETER_MARKER, null, "intraline", true);
+    return config;
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java b/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
index 9bdbd20..abfd7896 100644
--- a/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
@@ -88,15 +88,12 @@
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.BinaryResult;
-import com.google.gerrit.extensions.restapi.ETagView;
 import com.google.gerrit.extensions.restapi.MethodNotAllowedException;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
 import com.google.gerrit.extensions.webui.PatchSetWebLink;
-import com.google.gerrit.server.change.RevisionResource;
 import com.google.gerrit.server.query.change.ChangeData;
-import com.google.gerrit.server.restapi.change.GetRevisionActions;
 import com.google.gerrit.testing.FakeEmailSender;
 import com.google.inject.Inject;
 import java.io.ByteArrayOutputStream;
@@ -122,7 +119,6 @@
 import org.junit.Test;
 
 public class RevisionIT extends AbstractDaemonTest {
-  @Inject private GetRevisionActions getRevisionActions;
   @Inject private ProjectOperations projectOperations;
   @Inject private RequestScopeOperations requestScopeOperations;
   @Inject private ExtensionRegistry extensionRegistry;
@@ -1828,23 +1824,6 @@
   }
 
   @Test
-  public void actionsETag() throws Exception {
-    PushOneCommit.Result r1 = createChange();
-    PushOneCommit.Result r2 = createChange();
-
-    String oldETag = checkETag(getRevisionActions, r2, null);
-    current(r2).review(ReviewInput.approve());
-    oldETag = checkETag(getRevisionActions, r2, oldETag);
-
-    // Dependent change is included in ETag.
-    current(r1).review(ReviewInput.approve());
-    oldETag = checkETag(getRevisionActions, r2, oldETag);
-
-    current(r2).submit();
-    checkETag(getRevisionActions, r2, oldETag);
-  }
-
-  @Test
   public void deleteVoteOnNonCurrentPatchSet() throws Exception {
     PushOneCommit.Result r = createChange(); // patch set 1
     gApi.changes().id(r.getChangeId()).revision(r.getCommit().name()).review(ReviewInput.approve());
@@ -2015,13 +1994,6 @@
     return gApi.changes().id(r.getChangeId()).current();
   }
 
-  private String checkETag(ETagView<RevisionResource> view, PushOneCommit.Result r, String oldETag)
-      throws Exception {
-    String eTag = view.getETag(parseRevisionResource(r));
-    assertThat(eTag).isNotEqualTo(oldETag);
-    return eTag;
-  }
-
   private PushOneCommit.Result createCherryPickableMerge(
       String parent1FileName, String parent2FileName) throws Exception {
     RevCommit initialCommit = getHead(repo(), "HEAD");
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/RevisionNewDiffCacheIT.java b/javatests/com/google/gerrit/acceptance/api/revision/RevisionNewDiffCacheIT.java
new file mode 100644
index 0000000..4b85c30
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/api/revision/RevisionNewDiffCacheIT.java
@@ -0,0 +1,31 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.api.revision;
+
+import com.google.gerrit.testing.ConfigSuite;
+import org.eclipse.jgit.lib.Config;
+
+/**
+ * Runs the {@link RevisionDiffIT} tests with the new diff cache. This is temporary until the new
+ * diff cache is fully deployed. The new diff cache will become the default in the future.
+ */
+public class RevisionNewDiffCacheIT extends RevisionDiffIT {
+  @ConfigSuite.Default
+  public static Config newDiffCacheConfig() {
+    Config config = new Config();
+    config.setBoolean("cache", "diff_cache", "useNewDiffCache", true);
+    return config;
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/git/BUILD b/javatests/com/google/gerrit/acceptance/git/BUILD
index ef54c92..13311e3 100644
--- a/javatests/com/google/gerrit/acceptance/git/BUILD
+++ b/javatests/com/google/gerrit/acceptance/git/BUILD
@@ -21,7 +21,6 @@
     deps = [
         "//java/com/google/gerrit/acceptance:lib",
         "//java/com/google/gerrit/git",
-        "//java/com/google/gerrit/mail",
     ],
 )
 
diff --git a/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java b/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java
index 5699a04..b7acbe2 100644
--- a/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java
+++ b/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java
@@ -45,7 +45,6 @@
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.extensions.api.changes.DraftInput;
-import com.google.gerrit.extensions.api.changes.ReviewInput.RobotCommentInput;
 import com.google.gerrit.extensions.api.groups.GroupInput;
 import com.google.gerrit.extensions.api.projects.BranchInput;
 import com.google.gerrit.extensions.restapi.RestApiException;
@@ -59,7 +58,6 @@
 import com.google.gerrit.server.permissions.PermissionBackend.RefFilterOptions;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.testing.ConfigSuite;
-import com.google.gerrit.testing.TestCommentHelper;
 import com.google.inject.Inject;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -88,7 +86,6 @@
   @Inject private PermissionBackend permissionBackend;
   @Inject private ProjectOperations projectOperations;
   @Inject private RequestScopeOperations requestScopeOperations;
-  @Inject private TestCommentHelper testCommentHelper;
 
   private AccountGroup.UUID admins;
   private AccountGroup.UUID nonInteractiveUsers;
@@ -1426,258 +1423,6 @@
   }
 
   @Test
-  public void advertiseMostRecentRefChangesEvenWhenNotInInputWithRefStarPermission()
-      throws Exception {
-    // admin has refs/* permission.
-    requestScopeOperations.setApiUser(admin.id());
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      // set empty list of refs to filter
-                      new ArrayList<>(),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          // all the change refs are still returned since returnMostRecentRefChanges = true
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  psRef1, metaRef1, psRef2, metaRef2, psRef3, metaRef3, psRef4, metaRef4));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesEvenWhenNotInInputWithoutRefStarPermission()
-      throws Exception {
-    projectOperations
-        .project(project)
-        .forUpdate()
-        .add(allow(Permission.READ).ref("refs/heads/master").group(REGISTERED_USERS))
-        .update();
-
-    // user doesn't have refs/* permission.
-    requestScopeOperations.setApiUser(user.id());
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      // set empty list of refs to filter
-                      new ArrayList<>(),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          // all the change refs are still returned since returnMostRecentRefChanges = true
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  psRef1, metaRef1, psRef2, metaRef2, psRef3, metaRef3, psRef4, metaRef4));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesOnlyOnceWithRefStarPermission() throws Exception {
-    // admin has refs/* permission.
-    requestScopeOperations.setApiUser(admin.id());
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      repo.getRefDatabase().getRefs(),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          // all the change refs are still returned since returnMostRecentRefChanges = true. Make
-          // sure they are only returned once.
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  "HEAD",
-                  psRef1,
-                  metaRef1,
-                  psRef2,
-                  metaRef2,
-                  psRef3,
-                  metaRef3,
-                  psRef4,
-                  metaRef4,
-                  "refs/heads/branch",
-                  "refs/heads/master",
-                  "refs/meta/config",
-                  "refs/tags/branch-tag",
-                  "refs/tags/master-tag",
-                  "refs/tags/tree-tag"));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesOnlyOnceWithoutRefStarPermission() throws Exception {
-    projectOperations
-        .project(project)
-        .forUpdate()
-        .add(allow(Permission.READ).ref("refs/heads/master").group(REGISTERED_USERS))
-        .update();
-
-    // user doesn't have refs/* permission.
-    requestScopeOperations.setApiUser(user.id());
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      repo.getRefDatabase().getRefs(),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          // all the change refs are still returned since returnMostRecentRefChanges = true. Make
-          // sure they are only returned once.
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  "HEAD",
-                  psRef1,
-                  metaRef1,
-                  psRef2,
-                  metaRef2,
-                  psRef3,
-                  metaRef3,
-                  psRef4,
-                  metaRef4,
-                  "refs/heads/branch",
-                  "refs/heads/master",
-                  "refs/meta/config",
-                  "refs/tags/branch-tag",
-                  "refs/tags/master-tag",
-                  "refs/tags/tree-tag"));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesWithSingleRequestedRefWithRefStarPermission()
-      throws Exception {
-    // admin has refs/* permission.
-    requestScopeOperations.setApiUser(admin.id());
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      ImmutableList.of(repo.exactRef("HEAD")),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          // all the change refs are still returned since returnMostRecentRefChanges = true.
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  "HEAD", psRef1, metaRef1, psRef2, metaRef2, psRef3, metaRef3, psRef4, metaRef4));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesWithSingleRefRequetedWithoutRefStarPermission()
-      throws Exception {
-    projectOperations
-        .project(project)
-        .forUpdate()
-        .add(allow(Permission.READ).ref("refs/heads/master").group(REGISTERED_USERS))
-        .update();
-
-    // user doesn't have refs/* permission.
-    requestScopeOperations.setApiUser(user.id());
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      ImmutableList.of(repo.exactRef("HEAD")),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          // all the change refs are still returned since returnMostRecentRefChanges = true.
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  "HEAD", psRef1, metaRef1, psRef2, metaRef2, psRef3, metaRef3, psRef4, metaRef4));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesWithRobotCommentRef() throws Exception {
-    projectOperations
-        .project(project)
-        .forUpdate()
-        .add(allow(Permission.READ).ref("refs/heads/master").group(REGISTERED_USERS))
-        .update();
-
-    // user doesn't have refs/* permission.
-    requestScopeOperations.setApiUser(user.id());
-    RobotCommentInput input = TestCommentHelper.createRobotCommentInput(Patch.COMMIT_MSG);
-    testCommentHelper.addRobotComment(cd1.getId(), input);
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      repo.getRefDatabase().getRefs(),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(false).build())))
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  "HEAD",
-                  RefNames.changeRefPrefix(cd1.getId()) + "robot-comments",
-                  psRef1,
-                  metaRef1,
-                  psRef2,
-                  metaRef2,
-                  psRef3,
-                  metaRef3,
-                  psRef4,
-                  metaRef4,
-                  "refs/heads/branch",
-                  "refs/heads/master",
-                  "refs/meta/config",
-                  "refs/tags/branch-tag",
-                  "refs/tags/master-tag",
-                  "refs/tags/tree-tag"));
-    }
-  }
-
-  @Test
-  public void advertiseMostRecentRefChangesWithRobotCommentRefWithReturnMostRecentRefChanges()
-      throws Exception {
-    projectOperations
-        .project(project)
-        .forUpdate()
-        .add(allow(Permission.READ).ref("refs/heads/master").group(REGISTERED_USERS))
-        .update();
-
-    // user doesn't have refs/* permission.
-    requestScopeOperations.setApiUser(user.id());
-    RobotCommentInput input = TestCommentHelper.createRobotCommentInput(Patch.COMMIT_MSG);
-    testCommentHelper.addRobotComment(cd1.getId(), input);
-
-    try (Repository repo = repoManager.openRepository(project)) {
-      PermissionBackend.ForProject forProject = newFilter(project, admin);
-      assertThat(
-              names(
-                  forProject.filter(
-                      ImmutableList.of(),
-                      repo,
-                      RefFilterOptions.builder().setReturnMostRecentRefChanges(true).build())))
-          .containsExactlyElementsIn(
-              ImmutableList.of(
-                  RefNames.changeRefPrefix(cd1.getId()) + "robot-comments",
-                  psRef1,
-                  metaRef1,
-                  psRef2,
-                  metaRef2,
-                  psRef3,
-                  metaRef3,
-                  psRef4,
-                  metaRef4));
-    }
-  }
-
-  @Test
   public void fetchSingleChangeWithoutIndexAccess() throws Exception {
     PushOneCommit.Result change = createChange();
     String patchSetRef = change.getPatchSetId().toRefName();
diff --git a/javatests/com/google/gerrit/acceptance/rest/change/ActionsIT.java b/javatests/com/google/gerrit/acceptance/rest/change/ActionsIT.java
index c6a2819..e35f758 100644
--- a/javatests/com/google/gerrit/acceptance/rest/change/ActionsIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/change/ActionsIT.java
@@ -20,26 +20,20 @@
 import static com.google.gerrit.extensions.client.ListChangesOption.CURRENT_REVISION;
 import static com.google.gerrit.truth.MapSubject.assertThatMap;
 
-import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Iterables;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.ExtensionRegistry;
 import com.google.gerrit.acceptance.ExtensionRegistry.Registration;
 import com.google.gerrit.acceptance.PushOneCommit;
-import com.google.gerrit.acceptance.TestProjectInput;
-import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
 import com.google.gerrit.entities.Change;
 import com.google.gerrit.entities.PatchSet;
-import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.extensions.api.changes.ActionVisitor;
 import com.google.gerrit.extensions.api.changes.ReviewInput;
 import com.google.gerrit.extensions.client.ListChangesOption;
-import com.google.gerrit.extensions.client.SubmitType;
 import com.google.gerrit.extensions.common.ActionInfo;
 import com.google.gerrit.extensions.common.ChangeInfo;
 import com.google.gerrit.extensions.common.RevisionInfo;
 import com.google.gerrit.server.change.RevisionJson;
-import com.google.gerrit.server.change.testing.TestChangeETagComputation;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.testing.ConfigSuite;
 import com.google.inject.Inject;
@@ -56,7 +50,6 @@
     return submitWholeTopicEnabledConfig();
   }
 
-  @Inject private RequestScopeOperations requestScopeOperations;
   @Inject private RevisionJson.Factory revisionJsonFactory;
   @Inject private ExtensionRegistry extensionRegistry;
 
@@ -68,10 +61,6 @@
     return gApi.changes().id(id).get().actions;
   }
 
-  protected String getETag(String id) throws Exception {
-    return gApi.changes().id(id).current().etag();
-  }
-
   @Test
   public void changeActionOneMergedChangeHasOnlyNormalRevert() throws Exception {
     String changeId = createChangeWithTopic().getChangeId();
@@ -138,124 +127,6 @@
   }
 
   @Test
-  public void revisionActionsETag() throws Exception {
-    String parent = createChange().getChangeId();
-    String change = createChangeWithTopic().getChangeId();
-    approve(change);
-    String etag1 = getETag(change);
-
-    approve(parent);
-    String etag2 = getETag(change);
-
-    String changeWithSameTopic = createChangeWithTopic().getChangeId();
-    String etag3 = getETag(change);
-
-    approve(changeWithSameTopic);
-    String etag4 = getETag(change);
-
-    if (isSubmitWholeTopicEnabled()) {
-      assertThat(ImmutableList.of(etag1, etag2, etag3, etag4)).containsNoDuplicates();
-    } else {
-      assertThat(etag2).isNotEqualTo(etag1);
-      assertThat(etag3).isEqualTo(etag2);
-      assertThat(etag4).isEqualTo(etag2);
-    }
-  }
-
-  @Test
-  public void revisionActionsAnonymousETag() throws Exception {
-    String parent = createChange().getChangeId();
-    String change = createChangeWithTopic().getChangeId();
-    approve(change);
-
-    requestScopeOperations.setApiUserAnonymous();
-    String etag1 = getETag(change);
-
-    requestScopeOperations.setApiUser(admin.id());
-    approve(parent);
-
-    requestScopeOperations.setApiUserAnonymous();
-    String etag2 = getETag(change);
-
-    requestScopeOperations.setApiUser(admin.id());
-    String changeWithSameTopic = createChangeWithTopic().getChangeId();
-
-    requestScopeOperations.setApiUserAnonymous();
-    String etag3 = getETag(change);
-
-    requestScopeOperations.setApiUser(admin.id());
-    approve(changeWithSameTopic);
-
-    requestScopeOperations.setApiUserAnonymous();
-    String etag4 = getETag(change);
-
-    if (isSubmitWholeTopicEnabled()) {
-      assertThat(ImmutableList.of(etag1, etag2, etag3, etag4)).containsNoDuplicates();
-    } else {
-      assertThat(etag2).isNotEqualTo(etag1);
-      assertThat(etag3).isEqualTo(etag2);
-      assertThat(etag4).isEqualTo(etag2);
-    }
-  }
-
-  @Test
-  @TestProjectInput(submitType = SubmitType.CHERRY_PICK)
-  public void revisionActionsAnonymousETagCherryPickStrategy() throws Exception {
-    String parent = createChange().getChangeId();
-    String change = createChange().getChangeId();
-    approve(change);
-
-    requestScopeOperations.setApiUserAnonymous();
-    String etag1 = getETag(change);
-
-    requestScopeOperations.setApiUser(admin.id());
-    approve(parent);
-
-    requestScopeOperations.setApiUserAnonymous();
-    String etag2 = getETag(change);
-    assertThat(etag2).isEqualTo(etag1);
-  }
-
-  @Test
-  public void pluginCanContributeToETagComputation() throws Exception {
-    String change = createChange().getChangeId();
-    String oldETag = getETag(change);
-
-    try (Registration registration =
-        extensionRegistry.newRegistration().add(TestChangeETagComputation.withETag("foo"))) {
-      assertThat(getETag(change)).isNotEqualTo(oldETag);
-    }
-
-    assertThat(getETag(change)).isEqualTo(oldETag);
-  }
-
-  @Test
-  public void returningNullFromETagComputationDoesNotBreakGerrit() throws Exception {
-    String change = createChange().getChangeId();
-    String oldETag = getETag(change);
-
-    try (Registration registration =
-        extensionRegistry.newRegistration().add(TestChangeETagComputation.withETag(null))) {
-      assertThat(getETag(change)).isEqualTo(oldETag);
-    }
-  }
-
-  @Test
-  public void throwingExceptionFromETagComputationDoesNotBreakGerrit() throws Exception {
-    String change = createChange().getChangeId();
-    String oldETag = getETag(change);
-
-    try (Registration registration =
-        extensionRegistry
-            .newRegistration()
-            .add(
-                TestChangeETagComputation.withException(
-                    new StorageException("exception during test")))) {
-      assertThat(getETag(change)).isEqualTo(oldETag);
-    }
-  }
-
-  @Test
   public void revisionActionsTwoChangesInTopic_conflicting() throws Exception {
     String changeId = createChangeWithTopic().getChangeId();
     approve(changeId);
diff --git a/javatests/com/google/gerrit/acceptance/rest/change/ChangeMetaIT.java b/javatests/com/google/gerrit/acceptance/rest/change/ChangeMetaIT.java
new file mode 100644
index 0000000..e025c52
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/rest/change/ChangeMetaIT.java
@@ -0,0 +1,150 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.rest.change;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.entities.RefNames.changeMetaRef;
+
+import com.google.common.collect.Iterables;
+import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.PushOneCommit;
+import com.google.gerrit.acceptance.RestResponse;
+import com.google.gerrit.entities.Change;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.PluginDefinedInfo;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.change.ChangePluginDefinedInfoFactory;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.inject.AbstractModule;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.eclipse.jgit.lib.Repository;
+import org.junit.Test;
+
+/** Test handling of the NoteDb commit hash in the GetChange endpoint */
+public class ChangeMetaIT extends AbstractDaemonTest {
+  @Test
+  public void metaSha1_fromIndex() throws Exception {
+    PushOneCommit.Result result = createChange();
+    String changeId = result.getChangeId();
+
+    try (AutoCloseable ignored = disableNoteDb()) {
+      ChangeInfo change =
+          Iterables.getOnlyElement(gApi.changes().query().withQuery("change:" + changeId).get());
+
+      try (Repository repo = repoManager.openRepository(project)) {
+        assertThat(change.metaRevId)
+            .isEqualTo(
+                repo.exactRef(changeMetaRef(Change.id(change._number))).getObjectId().getName());
+      }
+    }
+  }
+
+  @Test
+  public void metaSha1_fromNoteDb() throws Exception {
+    PushOneCommit.Result result = createChange();
+    String changeId = result.getChangeId();
+    ChangeInfo before = gApi.changes().id(changeId).get();
+    try (Repository repo = repoManager.openRepository(project)) {
+      assertThat(before.metaRevId)
+          .isEqualTo(
+              repo.exactRef(changeMetaRef(Change.id(before._number))).getObjectId().getName());
+    }
+  }
+
+  @Test
+  public void ChangeInfo_metaSha1_parameter() throws Exception {
+    PushOneCommit.Result result = createChange();
+    String changeId = result.getChangeId();
+    gApi.changes().id(changeId).setMessage("before\n\n" + "Change-Id: " + result.getChangeId());
+    ChangeInfo before = gApi.changes().id(changeId).get();
+    gApi.changes().id(changeId).setMessage("after\n\n" + "Change-Id: " + result.getChangeId());
+    ChangeInfo after = gApi.changes().id(changeId).get();
+    assertThat(after.metaRevId).isNotEqualTo(before.metaRevId);
+
+    RestResponse resp = adminRestSession.get("/changes/" + changeId + "/?meta=" + before.metaRevId);
+    resp.assertOK();
+
+    ChangeInfo got;
+    try (JsonReader jsonReader = new JsonReader(resp.getReader())) {
+      jsonReader.setLenient(true);
+      got = newGson().fromJson(jsonReader, ChangeInfo.class);
+    }
+    assertThat(got.subject).isEqualTo(before.subject);
+  }
+
+  @Test
+  public void metaUnreachableSha1() throws Exception {
+    PushOneCommit.Result ch1 = createChange();
+    PushOneCommit.Result ch2 = createChange();
+
+    ChangeInfo info2 = gApi.changes().id(ch2.getChangeId()).get();
+
+    RestResponse resp =
+        adminRestSession.get("/changes/" + ch1.getChangeId() + "/?meta=" + info2.metaRevId);
+
+    resp.assertStatus(412);
+  }
+
+  protected static class PluginDefinedSimpleAttributeModule extends AbstractModule {
+    static class MyMetaHash extends PluginDefinedInfo {
+      String myMetaRef;
+    };
+
+    static PluginDefinedInfo newMyMetaHash(ChangeData cd) {
+      MyMetaHash mmh = new MyMetaHash();
+      mmh.myMetaRef = cd.notes().getMetaId().name();
+      return mmh;
+    }
+
+    @Override
+    public void configure() {
+      DynamicSet.bind(binder(), ChangePluginDefinedInfoFactory.class)
+          .toInstance(
+              (cds, bp, p) -> {
+                Map<Change.Id, PluginDefinedInfo> out = new HashMap<>();
+                cds.forEach(cd -> out.put(cd.getId(), newMyMetaHash(cd)));
+                return out;
+              });
+    }
+  }
+
+  @Test
+  public void pluginDefinedAttribute() throws Exception {
+    try (AutoCloseable ignored =
+        installPlugin("my-plugin", PluginDefinedSimpleAttributeModule.class)) {
+      PushOneCommit.Result result = createChange();
+      String changeId = result.getChangeId();
+      gApi.changes().id(changeId).setMessage("before\n\n" + "Change-Id: " + result.getChangeId());
+      ChangeInfo before = gApi.changes().id(changeId).get();
+      gApi.changes().id(changeId).setMessage("after\n\n" + "Change-Id: " + result.getChangeId());
+      ChangeInfo after = gApi.changes().id(changeId).get();
+
+      RestResponse resp =
+          adminRestSession.get("/changes/" + changeId + "/?meta=" + before.metaRevId);
+      resp.assertOK();
+
+      Map<String, Object> changeInfo =
+          newGson().fromJson(resp.getReader(), new TypeToken<Map<String, Object>>() {}.getType());
+      List<Object> plugins = (List<Object>) changeInfo.get("plugins");
+      Map<String, Object> myplugin = (Map<String, Object>) plugins.get(0);
+
+      assertThat(myplugin.get("my_meta_ref")).isEqualTo(before.metaRevId);
+    }
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java b/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java
index cef66654..0a84db4 100644
--- a/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java
@@ -58,7 +58,6 @@
   @GerritConfig(name = "auth.httpPasswordUrl", value = "https://example.com/password")
 
   // change
-  @GerritConfig(name = "change.largeChange", value = "300")
   @GerritConfig(name = "change.replyTooltip", value = "Publish votes and draft comments")
   @GerritConfig(name = "change.replyLabel", value = "Vote")
   @GerritConfig(name = "change.updateDelay", value = "50s")
@@ -102,7 +101,6 @@
     assertThat(i.auth.httpPasswordUrl).isNull();
 
     // change
-    assertThat(i.change.largeChange).isEqualTo(300);
     assertThat(i.change.replyTooltip).startsWith("Publish votes and draft comments");
     assertThat(i.change.replyLabel).isEqualTo("Vote\u2026");
     assertThat(i.change.updateDelay).isEqualTo(50);
@@ -170,7 +168,6 @@
     assertThat(i.auth.httpPasswordUrl).isNull();
 
     // change
-    assertThat(i.change.largeChange).isEqualTo(500);
     assertThat(i.change.replyTooltip).startsWith("Reply and score");
     assertThat(i.change.replyLabel).isEqualTo("Reply\u2026");
     assertThat(i.change.updateDelay).isEqualTo(300);
diff --git a/javatests/com/google/gerrit/acceptance/rest/project/BUILD b/javatests/com/google/gerrit/acceptance/rest/project/BUILD
index 5e1fc83..edcb1f9 100644
--- a/javatests/com/google/gerrit/acceptance/rest/project/BUILD
+++ b/javatests/com/google/gerrit/acceptance/rest/project/BUILD
@@ -20,7 +20,6 @@
         "LabelAssert.java",
     ],
     deps = [
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/server",
diff --git a/javatests/com/google/gerrit/acceptance/rest/project/CreateProjectIT.java b/javatests/com/google/gerrit/acceptance/rest/project/CreateProjectIT.java
index 10fd65f..e5c5952 100644
--- a/javatests/com/google/gerrit/acceptance/rest/project/CreateProjectIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/project/CreateProjectIT.java
@@ -53,6 +53,7 @@
 import com.google.gerrit.extensions.restapi.Url;
 import com.google.gerrit.server.group.SystemGroupBackend;
 import com.google.gerrit.server.project.ProjectState;
+import com.google.gerrit.server.validators.ValidationException;
 import com.google.inject.Inject;
 import java.util.Collections;
 import java.util.Optional;
@@ -328,6 +329,21 @@
   }
 
   @Test
+  public void createProjectWithInvalidBranch() throws Exception {
+    String newProjectName = name("newProject");
+    ProjectInput in = new ProjectInput();
+    in.name = newProjectName;
+    in.createEmptyCommit = true;
+    in.branches = ImmutableList.of("refs/heads/test", "refs/changes/34/1234");
+    Throwable thrown =
+        assertThrows(ResourceConflictException.class, () -> gApi.projects().create(in));
+    assertThat(thrown).hasCauseThat().isInstanceOf(ValidationException.class);
+    assertThat(thrown)
+        .hasMessageThat()
+        .contains("Cannot create a project with branch refs/changes/34/1234");
+  }
+
+  @Test
   public void createProjectWithCapability() throws Exception {
     projectOperations
         .allProjectsForUpdate()
diff --git a/javatests/com/google/gerrit/acceptance/server/change/BUILD b/javatests/com/google/gerrit/acceptance/server/change/BUILD
index e41178f..19ca946 100644
--- a/javatests/com/google/gerrit/acceptance/server/change/BUILD
+++ b/javatests/com/google/gerrit/acceptance/server/change/BUILD
@@ -18,8 +18,6 @@
         "//java/com/google/gerrit/acceptance:lib",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
-        "//java/com/google/gerrit/server/logging",
-        "//java/com/google/gerrit/server/util/time",
         "@guava//jar",
     ],
 )
diff --git a/javatests/com/google/gerrit/acceptance/server/change/CommentContextIT.java b/javatests/com/google/gerrit/acceptance/server/change/CommentContextIT.java
index adfe56d..548e3fe 100644
--- a/javatests/com/google/gerrit/acceptance/server/change/CommentContextIT.java
+++ b/javatests/com/google/gerrit/acceptance/server/change/CommentContextIT.java
@@ -19,11 +19,9 @@
 import static com.google.gerrit.entities.Patch.COMMIT_MSG;
 import static com.google.gerrit.entities.Patch.MERGE_LIST;
 import static com.google.gerrit.entities.Patch.PATCHSET_LEVEL;
-import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.MoreCollectors;
-import com.google.common.util.concurrent.UncheckedExecutionException;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.NoHttpd;
 import com.google.gerrit.acceptance.PushOneCommit;
@@ -148,12 +146,10 @@
         CommentsUtil.newComment(COMMIT_MSG, Side.REVISION, 100, "comment", false);
     CommentsUtil.addComments(gApi, changeId, ps1, comment);
 
-    Throwable thrown =
-        assertThrows(
-            UncheckedExecutionException.class,
-            () -> gApi.changes().id(changeId).commentsRequest().withContext(true).getAsList());
-
-    assertThat(thrown).hasCauseThat().hasMessageThat().contains("Invalid comment range");
+    List<CommentInfo> comments =
+        gApi.changes().id(changeId).commentsRequest().withContext(true).getAsList();
+    assertThat(comments).hasSize(1);
+    assertThat(comments.get(0).contextLines).isEmpty();
   }
 
   @Test
diff --git a/javatests/com/google/gerrit/acceptance/server/experiments/BUILD b/javatests/com/google/gerrit/acceptance/server/experiments/BUILD
new file mode 100644
index 0000000..0f01ffa
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/experiments/BUILD
@@ -0,0 +1,7 @@
+load("//javatests/com/google/gerrit/acceptance:tests.bzl", "acceptance_tests")
+
+acceptance_tests(
+    srcs = glob(["*IT.java"]),
+    group = "server_experiments",
+    labels = ["server"],
+)
diff --git a/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java b/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
new file mode 100644
index 0000000..09e6dfe
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
@@ -0,0 +1,77 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.server.experiments;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.config.GerritConfig;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
+import com.google.inject.Inject;
+import org.junit.Test;
+
+/** Tests for {@link ExperimentFeatures} */
+public class ExperimentFeaturesIT extends AbstractDaemonTest {
+
+  @Inject ExperimentFeatures experimentFeatures;
+
+  @Test
+  public void emptyConfig_defaultFeatures_enabled() {
+    for (String defaultFeature : ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES) {
+      assertThat(experimentFeatures.isFeatureEnabled(defaultFeature)).isTrue();
+    }
+
+    assertThat(experimentFeatures.getEnabledExperimentFeatures())
+        .isEqualTo(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES);
+  }
+
+  @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      values = {"enabledFeature", "enabledThenDisabledFeature"})
+  @GerritConfig(
+      name = "experiments.disabled",
+      values = {"enabledThenDisabledFeature"})
+  public void configOverride_anyFeatureAllowed() {
+    assertThat(experimentFeatures.isFeatureEnabled("enabledFeature")).isTrue();
+    assertThat(experimentFeatures.isFeatureEnabled("enabledThenDisabledFeature")).isFalse();
+    assertThat(experimentFeatures.isFeatureEnabled("unknownFeature")).isFalse();
+    ImmutableSet<String> expectedEnabledFeatures =
+        new ImmutableSet.Builder<String>()
+            .addAll(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES)
+            .add("enabledFeature")
+            .build();
+    assertThat(experimentFeatures.getEnabledExperimentFeatures())
+        .isEqualTo(expectedEnabledFeatures);
+  }
+
+  @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      values = {"enabledFeature"})
+  @GerritConfig(
+      name = "experiments.disabled",
+      values = {"UiFeature__patchset_comments"})
+  public void configOverride_defaultFeatureDisabled() {
+    assertThat(experimentFeatures.isFeatureEnabled("enabledFeature")).isTrue();
+    assertThat(
+            experimentFeatures.isFeatureEnabled(
+                ExperimentFeaturesConstants.UI_FEATURE_PATCHSET_COMMENTS))
+        .isFalse();
+    assertThat(experimentFeatures.getEnabledExperimentFeatures()).containsExactly("enabledFeature");
+  }
+}
diff --git a/javatests/com/google/gerrit/auth/BUILD b/javatests/com/google/gerrit/auth/BUILD
index d4bb16d..6a41d01 100644
--- a/javatests/com/google/gerrit/auth/BUILD
+++ b/javatests/com/google/gerrit/auth/BUILD
@@ -17,16 +17,13 @@
         "//prolog:gerrit-prolog-common",
     ],
     deps = [
-        "//java/com/google/gerrit/acceptance/testsuite/project",
         "//java/com/google/gerrit/auth",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/proto/testing",
         "//java/com/google/gerrit/server",
         "//java/com/google/gerrit/server/cache/serialize",
-        "//java/com/google/gerrit/server/cache/testing",
         "//java/com/google/gerrit/testing:gerrit-test-util",
-        "//java/com/google/gerrit/truth",
         "//lib:guava",
         "//lib:guava-retrying",
         "//lib:jgit",
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java b/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
index e8cf3e9..8cd09e6 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -39,10 +39,6 @@
 
   private static String getImageName(ElasticVersion version) {
     switch (version) {
-      case V7_2:
-        return "blacktop/elasticsearch:7.2.1";
-      case V7_3:
-        return "blacktop/elasticsearch:7.3.2";
       case V7_4:
         return "blacktop/elasticsearch:7.4.2";
       case V7_5:
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
index 1ec8a5d..508dc84 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
@@ -22,12 +22,6 @@
 public class ElasticVersionTest {
   @Test
   public void supportedVersion() throws Exception {
-    assertThat(ElasticVersion.forVersion("7.2.0")).isEqualTo(ElasticVersion.V7_2);
-    assertThat(ElasticVersion.forVersion("7.2.1")).isEqualTo(ElasticVersion.V7_2);
-
-    assertThat(ElasticVersion.forVersion("7.3.0")).isEqualTo(ElasticVersion.V7_3);
-    assertThat(ElasticVersion.forVersion("7.3.1")).isEqualTo(ElasticVersion.V7_3);
-
     assertThat(ElasticVersion.forVersion("7.4.0")).isEqualTo(ElasticVersion.V7_4);
     assertThat(ElasticVersion.forVersion("7.4.1")).isEqualTo(ElasticVersion.V7_4);
 
diff --git a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
index ba9475f..634231f 100644
--- a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
+++ b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
@@ -15,19 +15,24 @@
 package com.google.gerrit.httpd.raw;
 
 import static com.google.common.truth.Truth.assertThat;
-import static java.util.stream.Collectors.joining;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.extensions.api.GerritApi;
 import com.google.gerrit.extensions.api.accounts.Accounts;
 import com.google.gerrit.extensions.api.config.Config;
 import com.google.gerrit.extensions.api.config.Server;
 import com.google.gerrit.extensions.common.ServerInfo;
 import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.server.experiments.ConfigExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
 import com.google.gerrit.util.http.testutil.FakeHttpServletRequest;
 import com.google.gerrit.util.http.testutil.FakeHttpServletResponse;
+import java.util.ArrayList;
+import java.util.List;
 import org.junit.Test;
 
 public class IndexServletTest {
@@ -55,14 +60,19 @@
     String testCdnPath = "bar-cdn";
     String testFaviconURL = "zaz-url";
 
-    String disabledDefault = IndexHtmlUtil.DEFAULT_EXPERIMENTS.asList().get(0);
+    // Pick any known experiment enabled by default;
+    String disabledDefault = ExperimentFeaturesConstants.UI_FEATURE_PATCHSET_COMMENTS;
+    assertThat(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES).contains(disabledDefault);
+
     org.eclipse.jgit.lib.Config serverConfig = new org.eclipse.jgit.lib.Config();
     serverConfig.setStringList(
         "experiments", null, "enabled", ImmutableList.of("NewFeature", "DisabledFeature"));
     serverConfig.setStringList(
         "experiments", null, "disabled", ImmutableList.of("DisabledFeature", disabledDefault));
+    ExperimentFeatures experimentFeatures = new ConfigExperimentFeatures(serverConfig);
     IndexServlet servlet =
-        new IndexServlet(testCanonicalUrl, testCdnPath, testFaviconURL, gerritApi, serverConfig);
+        new IndexServlet(
+            testCanonicalUrl, testCdnPath, testFaviconURL, gerritApi, experimentFeatures);
 
     FakeHttpServletResponse response = new FakeHttpServletResponse();
 
@@ -85,14 +95,17 @@
                 + "\\x22\\/config\\/server\\/info\\x22: \\x7b\\x22default_theme\\x22:"
                 + "\\x22my-default-theme\\x22\\x7d, \\x22\\/config\\/server\\/top-menus\\x22: "
                 + "\\x5b\\x5d\\x7d');");
-    String enabledDefaults =
-        IndexHtmlUtil.DEFAULT_EXPERIMENTS.stream()
+    ImmutableSet<String> enabledDefaults =
+        ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES.stream()
             .filter(e -> !e.equals(disabledDefault))
-            .collect(joining("\\x22,"));
+            .collect(ImmutableSet.toImmutableSet());
+    List<String> expectedEnabled = new ArrayList<>();
+    expectedEnabled.add("NewFeature");
+    expectedEnabled.addAll(enabledDefaults);
     assertThat(output)
         .contains(
-            "window.ENABLED_EXPERIMENTS = JSON.parse('\\x5b\\x22NewFeature\\x22,\\x22"
-                + enabledDefaults
+            "window.ENABLED_EXPERIMENTS = JSON.parse('\\x5b\\x22"
+                + String.join("\\x22,", expectedEnabled)
                 + "\\x22\\x5d');</script>");
   }
 }
diff --git a/javatests/com/google/gerrit/server/BUILD b/javatests/com/google/gerrit/server/BUILD
index 9a6b82b..7ab7ae9 100644
--- a/javatests/com/google/gerrit/server/BUILD
+++ b/javatests/com/google/gerrit/server/BUILD
@@ -74,6 +74,7 @@
         "//lib:jgit",
         "//lib:jgit-junit",
         "//lib:protobuf",
+        "//lib:soy",
         "//lib/auto:auto-value",
         "//lib/auto:auto-value-annotations",
         "//lib/flogger:api",
diff --git a/javatests/com/google/gerrit/server/cache/serialize/BUILD b/javatests/com/google/gerrit/server/cache/serialize/BUILD
index 6976d19..fa6a717 100644
--- a/javatests/com/google/gerrit/server/cache/serialize/BUILD
+++ b/javatests/com/google/gerrit/server/cache/serialize/BUILD
@@ -5,7 +5,6 @@
     srcs = glob(["*.java"]),
     deps = [
         "//java/com/google/gerrit/entities",
-        "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/server",
         "//java/com/google/gerrit/server/cache/serialize",
         "//java/com/google/gerrit/server/cache/testing",
diff --git a/javatests/com/google/gerrit/server/cache/serialize/entities/BUILD b/javatests/com/google/gerrit/server/cache/serialize/entities/BUILD
index b84febb..a8158fc 100644
--- a/javatests/com/google/gerrit/server/cache/serialize/entities/BUILD
+++ b/javatests/com/google/gerrit/server/cache/serialize/entities/BUILD
@@ -4,14 +4,10 @@
     name = "tests",
     srcs = glob(["*.java"]),
     deps = [
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/server",
-        "//java/com/google/gerrit/server/cache/serialize",
         "//java/com/google/gerrit/server/cache/serialize/entities",
-        "//java/com/google/gerrit/server/cache/testing",
-        "//java/com/google/gerrit/testing:gerrit-test-util",
         "//lib:guava",
         "//lib:jgit",
         "//lib:protobuf",
diff --git a/javatests/com/google/gerrit/server/cache/serialize/entities/FileDiffOutputSerializerTest.java b/javatests/com/google/gerrit/server/cache/serialize/entities/FileDiffOutputSerializerTest.java
index 4307954..44ea55a 100644
--- a/javatests/com/google/gerrit/server/cache/serialize/entities/FileDiffOutputSerializerTest.java
+++ b/javatests/com/google/gerrit/server/cache/serialize/entities/FileDiffOutputSerializerTest.java
@@ -37,7 +37,7 @@
         FileDiffOutput.builder()
             .oldPath(Optional.of("old_file_path.txt"))
             .newPath(Optional.empty())
-            .changeType(Optional.of(ChangeType.DELETED))
+            .changeType(ChangeType.DELETED)
             .patchType(Optional.of(PatchType.UNIFIED))
             .size(23)
             .sizeDelta(10)
diff --git a/javatests/com/google/gerrit/server/cache/serialize/entities/GitFileDiffSerializerTest.java b/javatests/com/google/gerrit/server/cache/serialize/entities/GitFileDiffSerializerTest.java
index 8030818..93441a4 100644
--- a/javatests/com/google/gerrit/server/cache/serialize/entities/GitFileDiffSerializerTest.java
+++ b/javatests/com/google/gerrit/server/cache/serialize/entities/GitFileDiffSerializerTest.java
@@ -47,7 +47,7 @@
             .newPath(Optional.empty())
             .oldId(AbbreviatedObjectId.fromObjectId(OLD_ID))
             .newId(AbbreviatedObjectId.fromObjectId(NEW_ID))
-            .changeType(Optional.of(ChangeType.DELETED))
+            .changeType(ChangeType.DELETED)
             .patchType(Optional.of(PatchType.UNIFIED))
             .oldMode(Optional.of(FileMode.REGULAR_FILE))
             .newMode(Optional.of(FileMode.REGULAR_FILE))
diff --git a/javatests/com/google/gerrit/server/group/db/BUILD b/javatests/com/google/gerrit/server/group/db/BUILD
index 3303338..9f9f459 100644
--- a/javatests/com/google/gerrit/server/group/db/BUILD
+++ b/javatests/com/google/gerrit/server/group/db/BUILD
@@ -6,7 +6,6 @@
     srcs = glob(["*.java"]),
     deps = [
         "//java/com/google/gerrit/common:annotations",
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/common/data/testing:common-data-test-util",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/exceptions",
diff --git a/javatests/com/google/gerrit/server/mail/send/MailSoySauceProviderTest.java b/javatests/com/google/gerrit/server/mail/send/MailSoySauceProviderTest.java
new file mode 100644
index 0000000..2ec5e4d
--- /dev/null
+++ b/javatests/com/google/gerrit/server/mail/send/MailSoySauceProviderTest.java
@@ -0,0 +1,48 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.mail.send;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.plugincontext.PluginContext.PluginMetrics;
+import com.google.gerrit.server.plugincontext.PluginSetContext;
+import com.google.template.soy.shared.SoyAstCache;
+import java.nio.file.Paths;
+import org.junit.Before;
+import org.junit.Test;
+
+public class MailSoySauceProviderTest {
+
+  private SitePaths sitePaths;
+  private DynamicSet<MailSoyTemplateProvider> set;
+
+  @Before
+  public void setUp() throws Exception {
+    sitePaths = new SitePaths(Paths.get("."));
+    set = new DynamicSet<>();
+  }
+
+  @Test
+  public void soyCompilation() {
+    MailSoySauceProvider provider =
+        new MailSoySauceProvider(
+            sitePaths,
+            new SoyAstCache(),
+            new PluginSetContext<>(set, PluginMetrics.DISABLED_INSTANCE));
+    assertThat(provider.get()).isNotNull(); // should not throw
+  }
+}
diff --git a/javatests/com/google/gerrit/server/query/change/BUILD b/javatests/com/google/gerrit/server/query/change/BUILD
index 0258e5d..43b9690 100644
--- a/javatests/com/google/gerrit/server/query/change/BUILD
+++ b/javatests/com/google/gerrit/server/query/change/BUILD
@@ -19,7 +19,6 @@
         "//java/com/google/gerrit/acceptance/config",
         "//java/com/google/gerrit/acceptance/testsuite/project",
         "//java/com/google/gerrit/common:annotations",
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/httpd",
diff --git a/javatests/com/google/gerrit/server/rules/BUILD b/javatests/com/google/gerrit/server/rules/BUILD
index 250b0ce..5c57ede 100644
--- a/javatests/com/google/gerrit/server/rules/BUILD
+++ b/javatests/com/google/gerrit/server/rules/BUILD
@@ -7,7 +7,6 @@
     resources = ["//prologtests:gerrit_common_test"],
     runtime_deps = ["//prolog:gerrit-prolog-common"],
     deps = [
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/server",
         "//java/com/google/gerrit/server/project/testing:project-test-util",
diff --git a/javatests/com/google/gerrit/server/update/BUILD b/javatests/com/google/gerrit/server/update/BUILD
index e175b95..4fe4ab04 100644
--- a/javatests/com/google/gerrit/server/update/BUILD
+++ b/javatests/com/google/gerrit/server/update/BUILD
@@ -10,7 +10,6 @@
     ],
     deps = [
         "//java/com/google/gerrit/common:annotations",
-        "//java/com/google/gerrit/common:server",
         "//java/com/google/gerrit/entities",
         "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/server",
diff --git a/lib/highlightjs/highlight.min.js b/lib/highlightjs/highlight.min.js
index 7f5e3ef..38fa024 100644
--- a/lib/highlightjs/highlight.min.js
+++ b/lib/highlightjs/highlight.min.js
@@ -1,5 +1,5 @@
 /*
-  Highlight.js 10.5.0 (e67c3e06)
+  Highlight.js 10.6.0 (eb122d3b)
   License: BSD-3-Clause
   Copyright (c) 2006-2020, Ivan Sagalaev
 */
@@ -44,16 +44,16 @@
 },v=(e,t,n={})=>{const s=a({className:"comment",begin:e,end:t,contains:[]},n)
 ;return s.contains.push(E),s.contains.push({className:"doctag",
 begin:"(?:TODO|FIXME|NOTE|BUG|OPTIMIZE|HACK|XXX):",relevance:0}),s
-},N=v("//","$"),w=v("/\\*","\\*/"),R=v("#","$");var y=Object.freeze({
-__proto__:null,IDENT_RE:g,UNDERSCORE_IDENT_RE:d,NUMBER_RE:h,C_NUMBER_RE:f,
-BINARY_NUMBER_RE:p,
+},w=v("//","$"),N=v("/\\*","\\*/"),y=v("#","$");var R=Object.freeze({
+__proto__:null,MATCH_NOTHING_RE:/\b\B/,IDENT_RE:g,UNDERSCORE_IDENT_RE:d,
+NUMBER_RE:h,C_NUMBER_RE:f,BINARY_NUMBER_RE:p,
 RE_STARTERS_RE:"!|!=|!==|%|%=|&|&&|&=|\\*|\\*=|\\+|\\+=|,|-|-=|/=|/|:|;|<<|<<=|<=|<|===|==|=|>>>=|>>=|>=|>>>|>>|>|\\?|\\[|\\{|\\(|\\^|\\^=|\\||\\|=|\\|\\||~",
 SHEBANG:(e={})=>{const t=/^#![ ]*\//
 ;return e.binary&&(e.begin=((...e)=>e.map((e=>u(e))).join(""))(t,/.*\b/,e.binary,/\b.*/)),
 a({className:"meta",begin:t,end:/$/,relevance:0,"on:begin":(e,t)=>{
 0!==e.index&&t.ignoreMatch()}},e)},BACKSLASH_ESCAPE:m,APOS_STRING_MODE:b,
-QUOTE_STRING_MODE:x,PHRASAL_WORDS_MODE:E,COMMENT:v,C_LINE_COMMENT_MODE:N,
-C_BLOCK_COMMENT_MODE:w,HASH_COMMENT_MODE:R,NUMBER_MODE:{className:"number",
+QUOTE_STRING_MODE:x,PHRASAL_WORDS_MODE:E,COMMENT:v,C_LINE_COMMENT_MODE:w,
+C_BLOCK_COMMENT_MODE:N,HASH_COMMENT_MODE:y,NUMBER_MODE:{className:"number",
 begin:h,relevance:0},C_NUMBER_MODE:{className:"number",begin:f,relevance:0},
 BINARY_NUMBER_MODE:{className:"number",begin:p,relevance:0},CSS_NUMBER_MODE:{
 className:"number",
@@ -67,16 +67,21 @@
 t.data._beginMatch!==e[1]&&t.ignoreMatch()}})});function _(e,t){
 "."===e.input[e.index-1]&&t.ignoreMatch()}function k(e,t){
 t&&e.beginKeywords&&(e.begin="\\b("+e.beginKeywords.split(" ").join("|")+")(?!\\.)(?=\\b|\\s)",
-e.__beforeBegin=_,e.keywords=e.keywords||e.beginKeywords,delete e.beginKeywords)
-}function M(e,t){
+e.__beforeBegin=_,e.keywords=e.keywords||e.beginKeywords,delete e.beginKeywords,
+void 0===e.relevance&&(e.relevance=0))}function O(e,t){
 Array.isArray(e.illegal)&&(e.illegal=((...e)=>"("+e.map((e=>u(e))).join("|")+")")(...e.illegal))
-}function O(e,t){if(e.match){
+}function M(e,t){if(e.match){
 if(e.begin||e.end)throw Error("begin & end are not supported with match")
 ;e.begin=e.match,delete e.match}}function A(e,t){
 void 0===e.relevance&&(e.relevance=1)}
 const L=["of","and","for","in","not","or","if","then","parent","list","value"]
-;function B(e,t){return t?Number(t):(e=>L.includes(e.toLowerCase()))(e)?0:1}
-function I(e,{plugins:t}){function n(t,n){
+;function B(e,t,n="keyword"){const s={}
+;return"string"==typeof e?r(n,e.split(" ")):Array.isArray(e)?r(n,e):Object.keys(e).forEach((n=>{
+Object.assign(s,B(e[n],t,n))})),s;function r(e,n){
+t&&(n=n.map((e=>e.toLowerCase()))),n.forEach((t=>{const n=t.split("|")
+;s[n[0]]=[e,I(n[0],n[1])]}))}}function I(e,t){
+return t?Number(t):(e=>L.includes(e.toLowerCase()))(e)?0:1}
+function T(e,{plugins:t}){function n(t,n){
 return RegExp(u(t),"m"+(e.case_insensitive?"i":"")+(n?"g":""))}class s{
 constructor(){
 this.matchIndexes={},this.regexes=[],this.matchAt=1,this.position=0}
@@ -112,14 +117,11 @@
 e.contains&&e.contains.includes("self"))throw Error("ERR: contains `self` is not supported at the top-level of a language.  See documentation.")
 ;return e.classNameAliases=a(e.classNameAliases||{}),function t(s,i){const o=s
 ;if(s.compiled)return o
-;[O].forEach((e=>e(s,i))),e.compilerExtensions.forEach((e=>e(s,i))),
-s.__beforeBegin=null,[k,M,A].forEach((e=>e(s,i))),s.compiled=!0;let l=null
+;[M].forEach((e=>e(s,i))),e.compilerExtensions.forEach((e=>e(s,i))),
+s.__beforeBegin=null,[k,O,A].forEach((e=>e(s,i))),s.compiled=!0;let l=null
 ;if("object"==typeof s.keywords&&(l=s.keywords.$pattern,
-delete s.keywords.$pattern),s.keywords&&(s.keywords=((e,t)=>{const n={}
-;return"string"==typeof e?s("keyword",e):Object.keys(e).forEach((t=>{s(t,e[t])
-})),n;function s(e,s){t&&(s=s.toLowerCase()),s.split(" ").forEach((t=>{
-const s=t.split("|");n[s[0]]=[e,B(s[0],s[1])]}))}
-})(s.keywords,e.case_insensitive)),
+delete s.keywords.$pattern),
+s.keywords&&(s.keywords=B(s.keywords,e.case_insensitive)),
 s.lexemes&&l)throw Error("ERR: Prefer `keywords.$pattern` to `mode.lexemes`, BOTH are not allowed. (see mode reference) ")
 ;return l=l||s.lexemes||/\w+/,
 o.keywordPatternRe=n(l,!0),i&&(s.begin||(s.begin=/\B|\b/),
@@ -129,14 +131,14 @@
 s.endsWithParent&&i.terminatorEnd&&(o.terminatorEnd+=(s.end?"|":"")+i.terminatorEnd)),
 s.illegal&&(o.illegalRe=n(s.illegal)),
 s.contains||(s.contains=[]),s.contains=[].concat(...s.contains.map((e=>(e=>(e.variants&&!e.cachedVariants&&(e.cachedVariants=e.variants.map((t=>a(e,{
-variants:null},t)))),e.cachedVariants?e.cachedVariants:T(e)?a(e,{
+variants:null},t)))),e.cachedVariants?e.cachedVariants:j(e)?a(e,{
 starts:e.starts?a(e.starts):null
 }):Object.isFrozen(e)?a(e):e))("self"===e?s:e)))),s.contains.forEach((e=>{t(e,o)
 })),s.starts&&t(s.starts,i),o.matcher=(e=>{const t=new r
 ;return e.contains.forEach((e=>t.addRule(e.begin,{rule:e,type:"begin"
 }))),e.terminatorEnd&&t.addRule(e.terminatorEnd,{type:"end"
-}),e.illegal&&t.addRule(e.illegal,{type:"illegal"}),t})(o),o}(e)}function T(e){
-return!!e&&(e.endsWithParent||T(e.starts))}function j(e){const t={
+}),e.illegal&&t.addRule(e.illegal,{type:"illegal"}),t})(o),o}(e)}function j(e){
+return!!e&&(e.endsWithParent||j(e.starts))}function S(e){const t={
 props:["language","code","autodetect"],data:()=>({detectedLanguage:"",
 unknownLanguage:!1}),computed:{className(){
 return this.unknownLanguage?"":"hljs "+this.detectedLanguage},highlighted(){
@@ -148,26 +150,26 @@
 return!(this.language&&(e=this.autodetect,!e&&""!==e));var e},
 ignoreIllegals:()=>!0},render(e){return e("pre",{},[e("code",{
 class:this.className,domProps:{innerHTML:this.highlighted}})])}};return{
-Component:t,VuePlugin:{install(e){e.component("highlightjs",t)}}}}const S={
-"after:highlightBlock":({block:e,result:t,text:n})=>{const s=D(e)
+Component:t,VuePlugin:{install(e){e.component("highlightjs",t)}}}}const P={
+"after:highlightBlock":({block:e,result:t,text:n})=>{const s=C(e)
 ;if(!s.length)return;const a=document.createElement("div")
 ;a.innerHTML=t.value,t.value=((e,t,n)=>{let s=0,a="";const i=[];function o(){
 return e.length&&t.length?e[0].offset!==t[0].offset?e[0].offset<t[0].offset?e:t:"start"===t[0].event?e:t:e.length?e:t
-}function l(e){a+="<"+P(e)+[].map.call(e.attributes,(function(e){
+}function l(e){a+="<"+D(e)+[].map.call(e.attributes,(function(e){
 return" "+e.nodeName+'="'+r(e.value)+'"'})).join("")+">"}function c(e){
-a+="</"+P(e)+">"}function u(e){("start"===e.event?l:c)(e.node)}
+a+="</"+D(e)+">"}function u(e){("start"===e.event?l:c)(e.node)}
 for(;e.length||t.length;){let t=o()
 ;if(a+=r(n.substring(s,t[0].offset)),s=t[0].offset,t===e){i.reverse().forEach(c)
 ;do{u(t.splice(0,1)[0]),t=o()}while(t===e&&t.length&&t[0].offset===s)
 ;i.reverse().forEach(l)
 }else"start"===t[0].event?i.push(t[0].node):i.pop(),u(t.splice(0,1)[0])}
-return a+r(n.substr(s))})(s,D(a),n)}};function P(e){
-return e.nodeName.toLowerCase()}function D(e){const t=[];return function e(n,s){
+return a+r(n.substr(s))})(s,C(a),n)}};function D(e){
+return e.nodeName.toLowerCase()}function C(e){const t=[];return function e(n,s){
 for(let r=n.firstChild;r;r=r.nextSibling)3===r.nodeType?s+=r.nodeValue.length:1===r.nodeType&&(t.push({
-event:"start",offset:s,node:r}),s=e(r,s),P(r).match(/br|hr|img|input/)||t.push({
-event:"stop",offset:s,node:r}));return s}(e,0),t}const C=e=>{console.error(e)
-},H=(e,...t)=>{console.log("WARN: "+e,...t)},$=(e,t)=>{
-console.log(`Deprecated as of ${e}. ${t}`)},U=r,z=a,K=Symbol("nomatch")
+event:"start",offset:s,node:r}),s=e(r,s),D(r).match(/br|hr|img|input/)||t.push({
+event:"stop",offset:s,node:r}));return s}(e,0),t}const H=e=>{console.error(e)
+},U=(e,...t)=>{console.log("WARN: "+e,...t)},$=(e,t)=>{
+console.log(`Deprecated as of ${e}. ${t}`)},z=r,K=a,G=Symbol("nomatch")
 ;return(e=>{const n=Object.create(null),r=Object.create(null),a=[];let i=!0
 ;const o=/(^(<[^>]+>|\t|)+|\n)/gm,l="Could not find the language '{}', did you forget to load/include a language module?",u={
 disableAutodetect:!0,name:"Plain text",contains:[]};let g={
@@ -175,71 +177,71 @@
 languageDetectRe:/\blang(?:uage)?-([\w-]+)\b/i,classPrefix:"hljs-",
 tabReplace:null,useBR:!1,languages:null,__emitter:c};function d(e){
 return g.noHighlightRe.test(e)}function h(e,t,n,s){const r={code:t,language:e}
-;_("before:highlight",r);const a=r.result?r.result:f(r.language,r.code,n,s)
-;return a.code=r.code,_("after:highlight",a),a}function f(e,t,r,o){const c=t
+;M("before:highlight",r);const a=r.result?r.result:f(r.language,r.code,n,s)
+;return a.code=r.code,M("after:highlight",a),a}function f(e,t,r,o){const c=t
 ;function u(e,t){const n=w.case_insensitive?t[0].toLowerCase():t[0]
 ;return Object.prototype.hasOwnProperty.call(e.keywords,n)&&e.keywords[n]}
-function d(){null!=_.subLanguage?(()=>{if(""===O)return;let e=null
-;if("string"==typeof _.subLanguage){
-if(!n[_.subLanguage])return void M.addText(O)
-;e=f(_.subLanguage,O,!0,k[_.subLanguage]),k[_.subLanguage]=e.top
-}else e=p(O,_.subLanguage.length?_.subLanguage:null)
-;_.relevance>0&&(A+=e.relevance),M.addSublanguage(e.emitter,e.language)
-})():(()=>{if(!_.keywords)return void M.addText(O);let e=0
-;_.keywordPatternRe.lastIndex=0;let t=_.keywordPatternRe.exec(O),n="";for(;t;){
-n+=O.substring(e,t.index);const s=u(_,t);if(s){const[e,r]=s
-;M.addText(n),n="",A+=r;const a=w.classNameAliases[e]||e;M.addKeyword(t[0],a)
-}else n+=t[0];e=_.keywordPatternRe.lastIndex,t=_.keywordPatternRe.exec(O)}
-n+=O.substr(e),M.addText(n)})(),O=""}function h(e){
-return e.className&&M.openNode(w.classNameAliases[e.className]||e.className),
-_=Object.create(e,{parent:{value:_}}),_}function m(e,t,n){let r=((e,t)=>{
+function d(){null!=R.subLanguage?(()=>{if(""===M)return;let e=null
+;if("string"==typeof R.subLanguage){
+if(!n[R.subLanguage])return void O.addText(M)
+;e=f(R.subLanguage,M,!0,k[R.subLanguage]),k[R.subLanguage]=e.top
+}else e=p(M,R.subLanguage.length?R.subLanguage:null)
+;R.relevance>0&&(A+=e.relevance),O.addSublanguage(e.emitter,e.language)
+})():(()=>{if(!R.keywords)return void O.addText(M);let e=0
+;R.keywordPatternRe.lastIndex=0;let t=R.keywordPatternRe.exec(M),n="";for(;t;){
+n+=M.substring(e,t.index);const s=u(R,t);if(s){const[e,r]=s
+;O.addText(n),n="",A+=r;const a=w.classNameAliases[e]||e;O.addKeyword(t[0],a)
+}else n+=t[0];e=R.keywordPatternRe.lastIndex,t=R.keywordPatternRe.exec(M)}
+n+=M.substr(e),O.addText(n)})(),M=""}function h(e){
+return e.className&&O.openNode(w.classNameAliases[e.className]||e.className),
+R=Object.create(e,{parent:{value:R}}),R}function m(e,t,n){let r=((e,t)=>{
 const n=e&&e.exec(t);return n&&0===n.index})(e.endRe,n);if(r){if(e["on:end"]){
 const n=new s(e);e["on:end"](t,n),n.ignore&&(r=!1)}if(r){
 for(;e.endsParent&&e.parent;)e=e.parent;return e}}
 if(e.endsWithParent)return m(e.parent,t,n)}function b(e){
-return 0===_.matcher.regexIndex?(O+=e[0],1):(T=!0,0)}function x(e){
-const t=e[0],n=c.substr(e.index),s=m(_,e,n);if(!s)return K;const r=_
-;r.skip?O+=t:(r.returnEnd||r.excludeEnd||(O+=t),d(),r.excludeEnd&&(O=t));do{
-_.className&&M.closeNode(),_.skip||_.subLanguage||(A+=_.relevance),_=_.parent
-}while(_!==s.parent)
+return 0===R.matcher.regexIndex?(M+=e[0],1):(I=!0,0)}function x(e){
+const t=e[0],n=c.substr(e.index),s=m(R,e,n);if(!s)return G;const r=R
+;r.skip?M+=t:(r.returnEnd||r.excludeEnd||(M+=t),d(),r.excludeEnd&&(M=t));do{
+R.className&&O.closeNode(),R.skip||R.subLanguage||(A+=R.relevance),R=R.parent
+}while(R!==s.parent)
 ;return s.starts&&(s.endSameAsBegin&&(s.starts.endRe=s.endRe),
 h(s.starts)),r.returnEnd?0:t.length}let E={};function v(t,n){const a=n&&n[0]
-;if(O+=t,null==a)return d(),0
+;if(M+=t,null==a)return d(),0
 ;if("begin"===E.type&&"end"===n.type&&E.index===n.index&&""===a){
-if(O+=c.slice(n.index,n.index+1),!i){const t=Error("0 width match regex")
+if(M+=c.slice(n.index,n.index+1),!i){const t=Error("0 width match regex")
 ;throw t.languageName=e,t.badRule=E.rule,t}return 1}
 if(E=n,"begin"===n.type)return function(e){
 const t=e[0],n=e.rule,r=new s(n),a=[n.__beforeBegin,n["on:begin"]]
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+begin:n(/"/,a(...l)),end:/"/,keywords:l,illegal:/\n/,relevance:5,contains:[{
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physics_fixture_bind physics_fixture_bind_ext physics_fixture_delete physics_apply_force physics_apply_impulse physics_apply_angular_impulse physics_apply_local_force physics_apply_local_impulse physics_apply_torque physics_mass_properties physics_draw_debug physics_test_overlap physics_remove_fixture physics_set_friction physics_set_density physics_set_restitution physics_get_friction physics_get_density physics_get_restitution physics_joint_distance_create physics_joint_rope_create physics_joint_revolute_create physics_joint_prismatic_create physics_joint_pulley_create physics_joint_wheel_create physics_joint_weld_create physics_joint_friction_create physics_joint_gear_create physics_joint_enable_motor physics_joint_get_value physics_joint_set_value physics_joint_delete physics_particle_create physics_particle_delete physics_particle_delete_region_circle physics_particle_delete_region_box physics_particle_delete_region_poly physics_particle_set_flags physics_particle_set_category_flags physics_particle_draw physics_particle_draw_ext physics_particle_count physics_particle_get_data physics_particle_get_data_particle physics_particle_group_begin physics_particle_group_circle physics_particle_group_box physics_particle_group_polygon physics_particle_group_add_point physics_particle_group_end physics_particle_group_join physics_particle_group_delete physics_particle_group_count physics_particle_group_get_data physics_particle_group_get_mass physics_particle_group_get_inertia physics_particle_group_get_centre_x physics_particle_group_get_centre_y physics_particle_group_get_vel_x physics_particle_group_get_vel_y physics_particle_group_get_ang_vel physics_particle_group_get_x physics_particle_group_get_y physics_particle_group_get_angle physics_particle_set_group_flags physics_particle_get_group_flags physics_particle_get_max_count physics_particle_get_radius physics_particle_get_density physics_particle_get_damping physics_particle_get_gravity_scale physics_particle_set_max_count physics_particle_set_radius physics_particle_set_density physics_particle_set_damping physics_particle_set_gravity_scale network_create_socket network_create_socket_ext network_create_server network_create_server_raw network_connect network_connect_raw network_send_packet network_send_raw network_send_broadcast network_send_udp network_send_udp_raw network_set_timeout network_set_config network_resolve network_destroy buffer_create buffer_write buffer_read buffer_seek buffer_get_surface buffer_set_surface buffer_delete buffer_exists buffer_get_type buffer_get_alignment buffer_poke buffer_peek buffer_save buffer_save_ext buffer_load buffer_load_ext buffer_load_partial buffer_copy buffer_fill buffer_get_size buffer_tell buffer_resize buffer_md5 buffer_sha1 buffer_base64_encode buffer_base64_decode buffer_base64_decode_ext buffer_sizeof buffer_get_address buffer_create_from_vertex_buffer buffer_create_from_vertex_buffer_ext buffer_copy_from_vertex_buffer buffer_async_group_begin buffer_async_group_option buffer_async_group_end buffer_load_async buffer_save_async gml_release_mode gml_pragma steam_activate_overlay steam_is_overlay_enabled steam_is_overlay_activated steam_get_persona_name steam_initialised steam_is_cloud_enabled_for_app steam_is_cloud_enabled_for_account steam_file_persisted steam_get_quota_total steam_get_quota_free steam_file_write steam_file_write_file steam_file_read steam_file_delete steam_file_exists steam_file_size steam_file_share steam_is_screenshot_requested steam_send_screenshot steam_is_user_logged_on steam_get_user_steam_id steam_user_owns_dlc steam_user_installed_dlc steam_set_achievement steam_get_achievement steam_clear_achievement steam_set_stat_int steam_set_stat_float steam_set_stat_avg_rate steam_get_stat_int steam_get_stat_float steam_get_stat_avg_rate steam_reset_all_stats steam_reset_all_stats_achievements steam_stats_ready steam_create_leaderboard steam_upload_score steam_upload_score_ext steam_download_scores_around_user steam_download_scores steam_download_friends_scores steam_upload_score_buffer steam_upload_score_buffer_ext steam_current_game_language steam_available_languages steam_activate_overlay_browser steam_activate_overlay_user steam_activate_overlay_store steam_get_user_persona_name steam_get_app_id steam_get_user_account_id steam_ugc_download steam_ugc_create_item steam_ugc_start_item_update steam_ugc_set_item_title steam_ugc_set_item_description steam_ugc_set_item_visibility steam_ugc_set_item_tags steam_ugc_set_item_content steam_ugc_set_item_preview steam_ugc_submit_item_update steam_ugc_get_item_update_progress steam_ugc_subscribe_item steam_ugc_unsubscribe_item steam_ugc_num_subscribed_items steam_ugc_get_subscribed_items steam_ugc_get_item_install_info steam_ugc_get_item_update_info steam_ugc_request_item_details steam_ugc_create_query_user steam_ugc_create_query_user_ex steam_ugc_create_query_all steam_ugc_create_query_all_ex steam_ugc_query_set_cloud_filename_filter steam_ugc_query_set_match_any_tag steam_ugc_query_set_search_text steam_ugc_query_set_ranked_by_trend_days steam_ugc_query_add_required_tag steam_ugc_query_add_excluded_tag steam_ugc_query_set_return_long_description steam_ugc_query_set_return_total_only steam_ugc_query_set_allow_cached_response steam_ugc_send_query shader_set shader_get_name shader_reset shader_current shader_is_compiled shader_get_sampler_index shader_get_uniform shader_set_uniform_i shader_set_uniform_i_array shader_set_uniform_f shader_set_uniform_f_array shader_set_uniform_matrix shader_set_uniform_matrix_array shader_enable_corner_id texture_set_stage texture_get_texel_width texture_get_texel_height shaders_are_supported vertex_format_begin vertex_format_end vertex_format_delete vertex_format_add_position vertex_format_add_position_3d vertex_format_add_colour vertex_format_add_color vertex_format_add_normal vertex_format_add_texcoord vertex_format_add_textcoord vertex_format_add_custom vertex_create_buffer vertex_create_buffer_ext vertex_delete_buffer vertex_begin vertex_end vertex_position vertex_position_3d vertex_colour vertex_color vertex_argb vertex_texcoord vertex_normal vertex_float1 vertex_float2 vertex_float3 vertex_float4 vertex_ubyte4 vertex_submit vertex_freeze vertex_get_number vertex_get_buffer_size vertex_create_buffer_from_buffer vertex_create_buffer_from_buffer_ext push_local_notification push_get_first_local_notification push_get_next_local_notification push_cancel_local_notification skeleton_animation_set skeleton_animation_get skeleton_animation_mix skeleton_animation_set_ext skeleton_animation_get_ext skeleton_animation_get_duration skeleton_animation_get_frames skeleton_animation_clear skeleton_skin_set skeleton_skin_get skeleton_attachment_set skeleton_attachment_get skeleton_attachment_create skeleton_collision_draw_set skeleton_bone_data_get skeleton_bone_data_set skeleton_bone_state_get skeleton_bone_state_set skeleton_get_minmax skeleton_get_num_bounds skeleton_get_bounds skeleton_animation_get_frame skeleton_animation_set_frame draw_skeleton draw_skeleton_time draw_skeleton_instance draw_skeleton_collision skeleton_animation_list skeleton_skin_list skeleton_slot_data layer_get_id layer_get_id_at_depth layer_get_depth layer_create layer_destroy layer_destroy_instances layer_add_instance layer_has_instance layer_set_visible layer_get_visible layer_exists layer_x layer_y layer_get_x layer_get_y layer_hspeed layer_vspeed layer_get_hspeed layer_get_vspeed layer_script_begin layer_script_end layer_shader layer_get_script_begin layer_get_script_end layer_get_shader layer_set_target_room layer_get_target_room layer_reset_target_room layer_get_all layer_get_all_elements layer_get_name layer_depth layer_get_element_layer layer_get_element_type layer_element_move layer_force_draw_depth layer_is_draw_depth_forced layer_get_forced_depth layer_background_get_id layer_background_exists layer_background_create layer_background_destroy layer_background_visible layer_background_change layer_background_sprite layer_background_htiled layer_background_vtiled layer_background_stretch layer_background_yscale layer_background_xscale layer_background_blend layer_background_alpha layer_background_index layer_background_speed layer_background_get_visible layer_background_get_sprite layer_background_get_htiled layer_background_get_vtiled layer_background_get_stretch layer_background_get_yscale layer_background_get_xscale layer_background_get_blend layer_background_get_alpha layer_background_get_index layer_background_get_speed layer_sprite_get_id layer_sprite_exists layer_sprite_create layer_sprite_destroy layer_sprite_change layer_sprite_index layer_sprite_speed layer_sprite_xscale layer_sprite_yscale layer_sprite_angle layer_sprite_blend layer_sprite_alpha layer_sprite_x layer_sprite_y layer_sprite_get_sprite layer_sprite_get_index layer_sprite_get_speed layer_sprite_get_xscale layer_sprite_get_yscale layer_sprite_get_angle layer_sprite_get_blend layer_sprite_get_alpha layer_sprite_get_x layer_sprite_get_y layer_tilemap_get_id layer_tilemap_exists layer_tilemap_create layer_tilemap_destroy tilemap_tileset tilemap_x tilemap_y tilemap_set tilemap_set_at_pixel tilemap_get_tileset tilemap_get_tile_width tilemap_get_tile_height tilemap_get_width tilemap_get_height tilemap_get_x tilemap_get_y tilemap_get tilemap_get_at_pixel tilemap_get_cell_x_at_pixel tilemap_get_cell_y_at_pixel tilemap_clear draw_tilemap draw_tile tilemap_set_global_mask tilemap_get_global_mask tilemap_set_mask tilemap_get_mask tilemap_get_frame tile_set_empty tile_set_index tile_set_flip tile_set_mirror tile_set_rotate tile_get_empty tile_get_index tile_get_flip tile_get_mirror tile_get_rotate layer_tile_exists layer_tile_create layer_tile_destroy layer_tile_change layer_tile_xscale layer_tile_yscale layer_tile_blend layer_tile_alpha layer_tile_x layer_tile_y layer_tile_region layer_tile_visible layer_tile_get_sprite layer_tile_get_xscale layer_tile_get_yscale layer_tile_get_blend layer_tile_get_alpha layer_tile_get_x layer_tile_get_y layer_tile_get_region layer_tile_get_visible layer_instance_get_instance instance_activate_layer instance_deactivate_layer camera_create camera_create_view camera_destroy camera_apply camera_get_active camera_get_default camera_set_default camera_set_view_mat camera_set_proj_mat camera_set_update_script camera_set_begin_script camera_set_end_script camera_set_view_pos camera_set_view_size camera_set_view_speed camera_set_view_border camera_set_view_angle camera_set_view_target camera_get_view_mat camera_get_proj_mat camera_get_update_script camera_get_begin_script camera_get_end_script camera_get_view_x camera_get_view_y camera_get_view_width camera_get_view_height camera_get_view_speed_x camera_get_view_speed_y camera_get_view_border_x camera_get_view_border_y camera_get_view_angle camera_get_view_target view_get_camera view_get_visible view_get_xport view_get_yport view_get_wport view_get_hport view_get_surface_id view_set_camera view_set_visible view_set_xport view_set_yport view_set_wport view_set_hport view_set_surface_id gesture_drag_time gesture_drag_distance gesture_flick_speed gesture_double_tap_time gesture_double_tap_distance gesture_pinch_distance gesture_pinch_angle_towards gesture_pinch_angle_away gesture_rotate_time gesture_rotate_angle gesture_tap_count gesture_get_drag_time gesture_get_drag_distance gesture_get_flick_speed gesture_get_double_tap_time gesture_get_double_tap_distance gesture_get_pinch_distance gesture_get_pinch_angle_towards gesture_get_pinch_angle_away gesture_get_rotate_time gesture_get_rotate_angle gesture_get_tap_count keyboard_virtual_show keyboard_virtual_hide keyboard_virtual_status keyboard_virtual_height",
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+match:a(/\\/,e,/[\t ]*(?:[\r\n]|\r\n)/)}),L=(e="")=>({className:"subst",
+label:"interpol",begin:a(/\\/,e,/\(/),end:/\)/}),P=(e="")=>({begin:a(e,/"""/),
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+variants:[P(),P("#"),P("##"),P("###"),$(),$("#"),$("##"),$("###")]},j={
+match:a(/`/,w,/`/)},z=[j,{className:"variable",match:/\$\d+/},{
+className:"variable",match:`\\$${f}+`}],q=[{match:/(@|#)available/,
+className:"keyword",starts:{contains:[{begin:/\(/,end:/\)/,keywords:E,
+contains:[...S,I,K]}]}},{className:"keyword",match:a(/@/,t(...g))},{
+className:"meta",match:a(/@/,w)}],U={match:n(/\b[A-Z]/),relevance:0,contains:[{
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-},...N,...D,...M,S,$,...T,...j,K]}}})());
+match:a(/(AV|CA|CF|CG|CI|CL|CM|CN|CT|MK|MP|MTK|MTL|NS|SCN|SK|UI|WK|XC)/,f,"+")
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+match:/\.\.\./,relevance:0},{match:a(/\s+&\s+/,n(y)),relevance:0}]},Z={
+begin:/</,end:/>/,keywords:D,contains:[...v,...B,...q,M,U]};U.contains.push(Z)
+;const G={begin:/\(/,end:/\)/,relevance:0,keywords:D,contains:["self",{
+match:a(w,/\s*:/),keywords:"_|0",relevance:0
+},...v,...B,...k,...S,I,K,...z,...q,U]},H={beginKeywords:"func",contains:[{
+className:"title",match:t(j.match,w,b),endsParent:!0,relevance:0},p]},R={
+begin:/</,end:/>/,contains:[...v,U]},V={begin:/\(/,end:/\)/,keywords:D,
+contains:[{begin:t(n(a(w,/\s*:/)),n(a(w,/\s+/,w,/\s*:/))),end:/:/,relevance:0,
+contains:[{className:"keyword",match:/\b_\b/},{className:"params",match:w}]
+},...v,...B,...S,I,K,...q,U,G],endsParent:!0,illegal:/["']/},W={
+className:"function",match:n(/\bfunc\b/),contains:[H,R,V,p],illegal:[/\[/,/%/]
+},X={className:"function",match:/\b(subscript|init[?!]?)\s*(?=[<(])/,keywords:{
+keyword:"subscript init init? init!",$pattern:/\w+[?!]?/},contains:[R,V,p],
+illegal:/\[|%/},J={beginKeywords:"operator",end:e.MATCH_NOTHING_RE,contains:[{
+className:"title",match:b,endsParent:!0,relevance:0}]},Q={
+beginKeywords:"precedencegroup",end:e.MATCH_NOTHING_RE,contains:[{
+className:"title",match:y,relevance:0},{begin:/{/,end:/}/,relevance:0,
+endsParent:!0,keywords:[...l,...o],contains:[U]}]};for(const e of K.variants){
+const n=e.contains.find((e=>"interpol"===e.label));n.keywords=D
+;const a=[...B,...k,...S,I,K,...z];n.contains=[...a,{begin:/\(/,end:/\)/,
+contains:["self",...a]}]}return{name:"Swift",keywords:D,contains:[...v,W,X,{
+className:"class",beginKeywords:"struct protocol class extension enum",
+end:"\\{",excludeEnd:!0,keywords:D,contains:[e.inherit(e.TITLE_MODE,{
+begin:/[A-Za-z$_][\u00C0-\u02B80-9A-Za-z$_]*/}),...B]},J,Q,{
+beginKeywords:"import",end:/$/,contains:[...v],relevance:0
+},...B,...k,...S,I,K,...z,...q,U,G]}}})());
 hljs.registerLanguage("taggerscript",(()=>{"use strict";return e=>({
 name:"Tagger Script",contains:[{className:"comment",begin:/\$noop\(/,end:/\)/,
 contains:[{begin:/\(/,end:/\)/,contains:["self",{begin:/\\./}]}],relevance:10},{
@@ -3308,12 +3344,12 @@
 },{begin:/\S+/}],contains:[e.BACKSLASH_ESCAPE,{className:"template-variable",
 variants:[{begin:/\{\{/,end:/\}\}/},{begin:/%\{/,end:/\}/}]}]},i=e.inherit(s,{
 variants:[{begin:/'/,end:/'/},{begin:/"/,end:/"/},{begin:/[^\s,{}[\]]+/}]}),l={
-end:",",endsWithParent:!0,excludeEnd:!0,contains:[],keywords:n,relevance:0},t={
-begin:/\{/,end:/\}/,contains:[l],illegal:"\\n",relevance:0},g={begin:"\\[",
-end:"\\]",contains:[l],illegal:"\\n",relevance:0},b=[{className:"attr",
-variants:[{begin:"\\w[\\w :\\/.-]*:(?=[ \t]|$)"},{
-begin:'"\\w[\\w :\\/.-]*":(?=[ \t]|$)'},{begin:"'\\w[\\w :\\/.-]*':(?=[ \t]|$)"
-}]},{className:"meta",begin:"^---\\s*$",relevance:10},{className:"string",
+end:",",endsWithParent:!0,excludeEnd:!0,keywords:n,relevance:0},t={begin:/\{/,
+end:/\}/,contains:[l],illegal:"\\n",relevance:0},g={begin:"\\[",end:"\\]",
+contains:[l],illegal:"\\n",relevance:0},b=[{className:"attr",variants:[{
+begin:"\\w[\\w :\\/.-]*:(?=[ \t]|$)"},{begin:'"\\w[\\w :\\/.-]*":(?=[ \t]|$)'},{
+begin:"'\\w[\\w :\\/.-]*':(?=[ \t]|$)"}]},{className:"meta",begin:"^---\\s*$",
+relevance:10},{className:"string",
 begin:"[\\|>]([1-9]?[+-])?[ ]*\\n( +)[^ ][^\\n]*\\n(\\2[^\\n]+\\n?)*"},{
 begin:"<%[%=-]?",end:"[%-]?%>",subLanguage:"ruby",excludeBegin:!0,excludeEnd:!0,
 relevance:0},{className:"type",begin:"!\\w+!"+a},{className:"type",
@@ -3389,22 +3425,21 @@
 begin:/\{\{/,end:/\}\}/,contains:["self",t,n]}]}}})());
 hljs.registerLanguage("typescript",(()=>{"use strict"
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-;function t(e){return i("(?=",e,")")}function i(...e){return e.map((e=>{
-return(n=e)?"string"==typeof n?n:n.source:null;var n})).join("")}return r=>{
+;function t(e){return r("(?=",e,")")}function r(...e){return e.map((e=>{
+return(n=e)?"string"==typeof n?n:n.source:null;var n})).join("")}return i=>{
 const c={$pattern:e,
-keyword:n.concat(["type","namespace","typedef","interface","public","private","protected","implements","declare","abstract","readonly"]).join(" "),
-literal:a.join(" "),
-built_in:s.concat(["any","void","number","boolean","string","object","never","enum"]).join(" ")
+keyword:n.concat(["type","namespace","typedef","interface","public","private","protected","implements","declare","abstract","readonly"]),
+literal:a,
+built_in:s.concat(["any","void","number","boolean","string","object","never","enum"])
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-},b=(r=>{const c=e,o={begin:/<[A-Za-z0-9\\._:-]+/,
+},b=(i=>{const c=e,o={begin:/<[A-Za-z0-9\\._:-]+/,
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-literal:a.join(" "),built_in:s.join(" ")
-},b="\\.([0-9](_?[0-9])*)",d="0|[1-9](_?[0-9])*|0[0-7]*[89][0-9]*",g={
+})||n.ignoreMatch()):n.ignoreMatch()}},l={$pattern:e,keyword:n,literal:a,
+built_in:s},b="\\.([0-9](_?[0-9])*)",d="0|[1-9](_?[0-9])*|0[0-7]*[89][0-9]*",g={
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@@ -3413,53 +3448,53 @@
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 end:"\\}",keywords:l,contains:[]},E={begin:"html`",end:"",starts:{end:"`",
-returnEnd:!1,contains:[r.BACKSLASH_ESCAPE,u],subLanguage:"xml"}},m={
+returnEnd:!1,contains:[i.BACKSLASH_ESCAPE,u],subLanguage:"xml"}},m={
 begin:"css`",end:"",starts:{end:"`",returnEnd:!1,
-contains:[r.BACKSLASH_ESCAPE,u],subLanguage:"css"}},_={className:"string",
-begin:"`",end:"`",contains:[r.BACKSLASH_ESCAPE,u]},y={className:"comment",
-variants:[r.COMMENT(/\/\*\*(?!\/)/,"\\*/",{relevance:0,contains:[{
+contains:[i.BACKSLASH_ESCAPE,u],subLanguage:"css"}},_={className:"string",
+begin:"`",end:"`",contains:[i.BACKSLASH_ESCAPE,u]},y={className:"comment",
+variants:[i.COMMENT(/\/\*\*(?!\/)/,"\\*/",{relevance:0,contains:[{
 className:"doctag",begin:"@[A-Za-z]+",contains:[{className:"type",begin:"\\{",
 end:"\\}",relevance:0},{className:"variable",begin:c+"(?=\\s*(-)|$)",
 endsParent:!0,relevance:0},{begin:/(?=[^\n])\s/,relevance:0}]}]
-}),r.C_BLOCK_COMMENT_MODE,r.C_LINE_COMMENT_MODE]
-},p=[r.APOS_STRING_MODE,r.QUOTE_STRING_MODE,E,m,_,g,r.REGEXP_MODE]
+}),i.C_BLOCK_COMMENT_MODE,i.C_LINE_COMMENT_MODE]
+},p=[i.APOS_STRING_MODE,i.QUOTE_STRING_MODE,E,m,_,g,i.REGEXP_MODE]
 ;u.contains=p.concat({begin:/\{/,end:/\}/,keywords:l,contains:["self"].concat(p)
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 excludeBegin:!0,excludeEnd:!0,keywords:l,contains:f};return{name:"Javascript",
 aliases:["js","jsx","mjs","cjs"],keywords:l,exports:{PARAMS_CONTAINS:f},
-illegal:/#(?![$_A-z])/,contains:[r.SHEBANG({label:"shebang",binary:"node",
+illegal:/#(?![$_A-z])/,contains:[i.SHEBANG({label:"shebang",binary:"node",
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-begin:i(/[{,\n]\s*/,t(i(/(((\/\/.*$)|(\/\*(\*[^/]|[^*])*\*\/))\s*)*/,c+"\\s*:"))),
+},i.APOS_STRING_MODE,i.QUOTE_STRING_MODE,E,m,_,y,g,{
+begin:r(/[{,\n]\s*/,t(r(/(((\/\/.*$)|(\/\*(\*[^/]|[^*])*\*\/))\s*)*/,c+"\\s*:"))),
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-keywords:"return throw case",contains:[y,r.REGEXP_MODE,{className:"function",
-begin:"(\\([^()]*(\\([^()]*(\\([^()]*\\)[^()]*)*\\)[^()]*)*\\)|"+r.UNDERSCORE_IDENT_RE+")\\s*=>",
+begin:"("+i.RE_STARTERS_RE+"|\\b(case|return|throw)\\b)\\s*",
+keywords:"return throw case",contains:[y,i.REGEXP_MODE,{className:"function",
+begin:"(\\([^()]*(\\([^()]*(\\([^()]*\\)[^()]*)*\\)[^()]*)*\\)|"+i.UNDERSCORE_IDENT_RE+")\\s*=>",
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-begin:r.UNDERSCORE_IDENT_RE,relevance:0},{className:null,begin:/\(\s*\)/,skip:!0
+begin:i.UNDERSCORE_IDENT_RE,relevance:0},{className:null,begin:/\(\s*\)/,skip:!0
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-contains:["self",r.inherit(r.TITLE_MODE,{begin:c}),A],illegal:/%/},{
+contains:["self",i.inherit(i.TITLE_MODE,{begin:c}),A],illegal:/%/},{
 beginKeywords:"while if switch catch for"},{className:"function",
-begin:r.UNDERSCORE_IDENT_RE+"\\([^()]*(\\([^()]*(\\([^()]*\\)[^()]*)*\\)[^()]*)*\\)\\s*\\{",
-returnBegin:!0,contains:[A,r.inherit(r.TITLE_MODE,{begin:c})]},{variants:[{
+begin:i.UNDERSCORE_IDENT_RE+"\\([^()]*(\\([^()]*(\\([^()]*\\)[^()]*)*\\)[^()]*)*\\)\\s*\\{",
+returnBegin:!0,contains:[A,i.inherit(i.TITLE_MODE,{begin:c})]},{variants:[{
 begin:"\\."+c},{begin:"\\$"+c}],relevance:0},{className:"class",
 beginKeywords:"class",end:/[{;=]/,excludeEnd:!0,illegal:/[:"[\]]/,contains:[{
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-end:/[{;]/,excludeEnd:!0,contains:[r.inherit(r.TITLE_MODE,{begin:c}),"self",A]
+beginKeywords:"extends"},i.UNDERSCORE_TITLE_MODE]},{begin:/\b(?=constructor)/,
+end:/[{;]/,excludeEnd:!0,contains:[i.inherit(i.TITLE_MODE,{begin:c}),"self",A]
 },{begin:"(get|set)\\s+(?="+c+"\\()",end:/\{/,keywords:"get set",
-contains:[r.inherit(r.TITLE_MODE,{begin:c}),{begin:/\(\)/},A]},{begin:/\$[(.]/}]
-}})(r)
+contains:[i.inherit(i.TITLE_MODE,{begin:c}),{begin:/\(\)/},A]},{begin:/\$[(.]/}]
+}})(i)
 ;return Object.assign(b.keywords,c),b.exports.PARAMS_CONTAINS.push(o),b.contains=b.contains.concat([o,{
 beginKeywords:"namespace",end:/\{/,excludeEnd:!0},{beginKeywords:"interface",
 end:/\{/,excludeEnd:!0,keywords:"interface extends"
-}]),l(b,"shebang",r.SHEBANG()),l(b,"use_strict",{className:"meta",relevance:10,
+}]),l(b,"shebang",i.SHEBANG()),l(b,"use_strict",{className:"meta",relevance:10,
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 }),b.contains.find((e=>"function"===e.className)).relevance=0,Object.assign(b,{
 name:"TypeScript",aliases:["ts"]}),b}})());
@@ -3505,9 +3540,9 @@
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 ;return{name:"VBScript",aliases:["vbs"],case_insensitive:!0,keywords:{
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-built_in:"server response request scriptengine scriptenginebuildversion scriptengineminorversion scriptenginemajorversion",
+built_in:["server","response","request","scriptengine","scriptenginebuildversion","scriptengineminorversion","scriptenginemajorversion"],
 literal:"true false null nothing empty"},illegal:"//",contains:[{
-begin:t(r(...i),"\\s*\\("),relevance:0,keywords:{built_in:i.join(" ")}
+begin:t(r(...i),"\\s*\\("),relevance:0,keywords:{built_in:i}
 },e.inherit(e.QUOTE_STRING_MODE,{contains:[{begin:'""'}]}),e.COMMENT(/'/,/$/,{
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 hljs.registerLanguage("vbscript-html",(()=>{"use strict";return e=>({
diff --git a/plugins/singleusergroup b/plugins/singleusergroup
index 3548ec8..09623b9 160000
--- a/plugins/singleusergroup
+++ b/plugins/singleusergroup
@@ -1 +1 @@
-Subproject commit 3548ec83c0c271a8768a6b03b0c28711521ed6cf
+Subproject commit 09623b9432d360060f88ae48fb3386e374ca29c0
diff --git a/polygerrit-ui/app/api/admin.ts b/polygerrit-ui/app/api/admin.ts
new file mode 100644
index 0000000..a7b549d
--- /dev/null
+++ b/polygerrit-ui/app/api/admin.ts
@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/** Interface for menu link */
+export interface MenuLink {
+  text: string;
+  url: string;
+  capability: string | null;
+}
+
+export interface AdminPluginApi {
+  addMenuLink(text: string, url: string, capability?: string): void;
+
+  getMenuLinks(): MenuLink[];
+}
diff --git a/polygerrit-ui/app/api/annotation.ts b/polygerrit-ui/app/api/annotation.ts
new file mode 100644
index 0000000..c046b4f
--- /dev/null
+++ b/polygerrit-ui/app/api/annotation.ts
@@ -0,0 +1,130 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {CoverageRange, Side} from './diff';
+import {StyleObject} from './styles';
+
+export type AddLayerFunc = (ctx: AnnotationContext) => void;
+
+export type NotifyFunc = (
+  path: string,
+  start: number,
+  end: number,
+  side: Side
+) => void;
+
+export type CoverageProvider = (
+  changeNum: number,
+  path: string,
+  basePatchNum?: number,
+  patchNum?: number,
+  /**
+   * This is a ChangeInfo object as defined here:
+   * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#change-info
+   * We neither want to repeat it nor add a dependency on it here.
+   */
+  change?: unknown
+) => Promise<Array<CoverageRange>>;
+
+export interface AnnotationContext {
+  /**
+   * Method to add annotations to a content line.
+   *
+   * @param offset The char offset where the update starts.
+   * @param length The number of chars that the update covers.
+   * @param styleObject The style object for the range.
+   * @param side The side of the update. ('left' or 'right')
+   */
+  annotateRange(
+    offset: number,
+    length: number,
+    styleObject: StyleObject,
+    side: string
+  ): void;
+
+  /**
+   * Method to add a CSS class to the line number TD element.
+   *
+   * @param styleObject The style object for the range.
+   * @param side The side of the update. ('left' or 'right')
+   */
+  annotateLineNumber(styleObject: StyleObject, side: string): void;
+}
+
+export interface AnnotationPluginApi {
+  /**
+   * Register a function to call to apply annotations. Plugins should use
+   * GrAnnotationActionsContext.annotateRange and
+   * GrAnnotationActionsContext.annotateLineNumber to apply a CSS class to the
+   * line content or the line number.
+   *
+   * @param addLayerFunc The function
+   * that will be called when the AnnotationLayer is ready to annotate.
+   */
+  addLayer(addLayerFunc: AddLayerFunc): AnnotationPluginApi;
+
+  /**
+   * The specified function will be called with a notify function for the plugin
+   * to call when it has all required data for annotation. Optional.
+   *
+   * @param notifyFunc See doc of the notify function below to see what it does.
+   */
+  addNotifier(notifyFunc: (n: NotifyFunc) => void): AnnotationPluginApi;
+
+  /**
+   * The specified function will be called when a gr-diff component is built,
+   * and feeds the returned coverage data into the diff. Optional.
+   *
+   * Be sure to call this only once and only from one plugin. Multiple coverage
+   * providers are not supported. A second call will just overwrite the
+   * provider of the first call.
+   */
+  setCoverageProvider(coverageProvider: CoverageProvider): AnnotationPluginApi;
+
+  /**
+   * Returns a checkbox HTMLElement that can be used to toggle annotations
+   * on/off. The checkbox will be initially disabled. Plugins should enable it
+   * when data is ready and should add a click handler to toggle CSS on/off.
+   *
+   * Note1: Calling this method from multiple plugins will only work for the
+   * 1st call. It will print an error message for all subsequent calls
+   * and will not invoke their onAttached functions.
+   * Note2: This method will be deprecated and eventually removed when
+   * https://bugs.chromium.org/p/gerrit/issues/detail?id=8077 is
+   * implemented.
+   *
+   * @param checkboxLabel Will be used as the label for the checkbox.
+   * Optional. "Enable" is used if this is not specified.
+   * @param onAttached The function that will be called
+   * when the checkbox is attached to the page.
+   */
+  enableToggleCheckbox(
+    checkboxLabel: string,
+    onAttached: (checkboxEl: Element | null) => void
+  ): AnnotationPluginApi;
+
+  /**
+   * The notify function will call the listeners of all required annotation
+   * layers. Intended to be called by the plugin when all required data for
+   * annotation is available.
+   *
+   * @param path The file path whose listeners should be notified.
+   * @param start The line where the update starts.
+   * @param end The line where the update ends.
+   * @param side The side of the update ('left' or 'right').
+   */
+  notify(path: string, start: number, end: number, side: Side): void;
+}
diff --git a/polygerrit-ui/app/api/attribute-helper.ts b/polygerrit-ui/app/api/attribute-helper.ts
new file mode 100644
index 0000000..cd52259
--- /dev/null
+++ b/polygerrit-ui/app/api/attribute-helper.ts
@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface AttributeHelperPluginApi {
+  /**
+   * Binds callback to property updates.
+   *
+   * @param name Property name.
+   * @return Unbind function.
+   */
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  bind(name: string, callback: (value: any) => void): () => any;
+
+  /**
+   * Get value of the property from wrapped object. Waits for the property
+   * to be initialized if it isn't defined.
+   */
+  get(name: string): Promise<unknown>;
+
+  /**
+   * Sets value and dispatches event to force notify.
+   */
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  set(name: string, value: any): void;
+}
diff --git a/polygerrit-ui/app/api/change-actions.ts b/polygerrit-ui/app/api/change-actions.ts
new file mode 100644
index 0000000..792f31e
--- /dev/null
+++ b/polygerrit-ui/app/api/change-actions.ts
@@ -0,0 +1,113 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {HttpMethod} from './rest';
+
+export interface ActionInfo {
+  method?: HttpMethod;
+  label?: string;
+  title?: string;
+  enabled?: boolean;
+}
+
+export enum ActionType {
+  CHANGE = 'change',
+  REVISION = 'revision',
+}
+
+export enum ActionPriority {
+  CHANGE = 2,
+  DEFAULT = 0,
+  PRIMARY = 3,
+  REVIEW = -3,
+  REVISION = 1,
+}
+
+export enum ChangeActions {
+  ABANDON = 'abandon',
+  DELETE = '/',
+  DELETE_EDIT = 'deleteEdit',
+  EDIT = 'edit',
+  FOLLOW_UP = 'followup',
+  IGNORE = 'ignore',
+  MOVE = 'move',
+  PRIVATE = 'private',
+  PRIVATE_DELETE = 'private.delete',
+  PUBLISH_EDIT = 'publishEdit',
+  REBASE = 'rebase',
+  REBASE_EDIT = 'rebaseEdit',
+  READY = 'ready',
+  RESTORE = 'restore',
+  REVERT = 'revert',
+  REVERT_SUBMISSION = 'revert_submission',
+  REVIEWED = 'reviewed',
+  STOP_EDIT = 'stopEdit',
+  SUBMIT = 'submit',
+  UNIGNORE = 'unignore',
+  UNREVIEWED = 'unreviewed',
+  WIP = 'wip',
+}
+
+export enum RevisionActions {
+  CHERRYPICK = 'cherrypick',
+  REBASE = 'rebase',
+  SUBMIT = 'submit',
+  DOWNLOAD = 'download',
+}
+
+export type PrimaryActionKey = ChangeActions | RevisionActions;
+
+export interface ChangeActionsPluginApi {
+  addPrimaryActionKey(key: PrimaryActionKey): void;
+
+  removePrimaryActionKey(key: string): void;
+
+  hideQuickApproveAction(): void;
+
+  setActionOverflow(type: ActionType, key: string, overflow: boolean): void;
+
+  setActionPriority(
+    type: ActionType,
+    key: string,
+    priority: ActionPriority
+  ): void;
+
+  setActionHidden(type: ActionType, key: string, hidden: boolean): void;
+
+  add(type: ActionType, label: string): string;
+
+  remove(key: string): void;
+
+  addTapListener(
+    key: string,
+    handler: EventListenerOrEventListenerObject
+  ): void;
+
+  removeTapListener(
+    key: string,
+    handler: EventListenerOrEventListenerObject
+  ): void;
+
+  setLabel(key: string, text: string): void;
+
+  setTitle(key: string, text: string): void;
+
+  setEnabled(key: string, enabled: boolean): void;
+
+  setIcon(key: string, icon: string): void;
+
+  getActionDetails(action: string): ActionInfo | undefined;
+}
diff --git a/polygerrit-ui/app/api/change-metadata.ts b/polygerrit-ui/app/api/change-metadata.ts
new file mode 100644
index 0000000..effe661
--- /dev/null
+++ b/polygerrit-ui/app/api/change-metadata.ts
@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface ChangeMetadataPluginApi {
+  onLabelsChanged(callback: (value: unknown) => void): ChangeMetadataPluginApi;
+}
diff --git a/polygerrit-ui/app/api/change-reply.ts b/polygerrit-ui/app/api/change-reply.ts
new file mode 100644
index 0000000..37c96ee
--- /dev/null
+++ b/polygerrit-ui/app/api/change-reply.ts
@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export interface LabelsChangedDetail {
+  name: string;
+  value: string;
+}
+export interface ValueChangedDetail {
+  value: string;
+}
+export type ReplyChangedCallback = (text: string) => void;
+export type LabelsChangedCallback = (detail: LabelsChangedDetail) => void;
+
+export interface ChangeReplyPluginApi {
+  getLabelValue(label: string): string;
+
+  setLabelValue(label: string, value: string): void;
+
+  send(includeComments?: boolean): void;
+
+  addReplyTextChangedCallback(handler: ReplyChangedCallback): void;
+
+  addLabelValuesChangedCallback(handler: LabelsChangedCallback): void;
+
+  showMessage(message: string): void;
+}
diff --git a/polygerrit-ui/app/api/checks.ts b/polygerrit-ui/app/api/checks.ts
index 87d7a2a..143fbd1 100644
--- a/polygerrit-ui/app/api/checks.ts
+++ b/polygerrit-ui/app/api/checks.ts
@@ -20,7 +20,7 @@
 // Changes to all type and interfaces are expected.
 // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
-export interface GrChecksApiInterface {
+export interface ChecksPluginApi {
   /**
    * Must only be called once. You cannot register twice. You cannot unregister.
    */
diff --git a/polygerrit-ui/app/api/diff.ts b/polygerrit-ui/app/api/diff.ts
index 5d7125c..bd110c8 100644
--- a/polygerrit-ui/app/api/diff.ts
+++ b/polygerrit-ui/app/api/diff.ts
@@ -162,20 +162,20 @@
 export declare interface DiffPreferencesInfo {
   context: number;
   ignore_whitespace: IgnoreWhitespaceType;
-  intraline_difference?: boolean;
   line_length: number;
   show_line_endings?: boolean;
   show_tabs?: boolean;
   show_whitespace_errors?: boolean;
-  skip_uncommented?: boolean;
   syntax_highlighting?: boolean;
-  auto_hide_diff_table_header?: boolean;
   tab_size: number;
   font_size: number;
   // TODO: Missing documentation
   show_file_comment_button?: boolean;
-  // TODO: Missing documentation
-  theme?: string;
+}
+
+export declare interface RenderPreferences {
+  hide_left_side?: boolean;
+  disable_context_control_buttons?: boolean;
 }
 
 /**
diff --git a/polygerrit-ui/app/api/event-helper.ts b/polygerrit-ui/app/api/event-helper.ts
new file mode 100644
index 0000000..c4a559b
--- /dev/null
+++ b/polygerrit-ui/app/api/event-helper.ts
@@ -0,0 +1,49 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export type UnsubscribeCallback = () => void;
+
+export interface EventHelperPluginApi {
+  /**
+   * Add a callback to arbitrary event.
+   * The callback may return false to prevent event bubbling.
+   */
+  on(event: string, callback: (event: Event) => boolean): UnsubscribeCallback;
+
+  /**
+   * Alias for @see onClick
+   */
+  onTap(callback: (event: Event) => boolean): UnsubscribeCallback;
+
+  /**
+   * Add a callback to element click or touch.
+   * The callback may return false to prevent event bubbling.
+   */
+  onClick(callback: (event: Event) => boolean): UnsubscribeCallback;
+
+  /**
+   * Alias for @see captureClick
+   */
+  captureTap(callback: (event: Event) => boolean): UnsubscribeCallback;
+
+  /**
+   * Add a callback to element click or touch ahead of normal flow.
+   * Callback is installed on parent during capture phase.
+   * https://www.w3.org/TR/DOM-Level-3-Events/#event-flow
+   * The callback may return false to cancel regular event listeners.
+   */
+  captureClick(callback: (event: Event) => boolean): UnsubscribeCallback;
+}
diff --git a/polygerrit-ui/app/api/hook.ts b/polygerrit-ui/app/api/hook.ts
new file mode 100644
index 0000000..179b967
--- /dev/null
+++ b/polygerrit-ui/app/api/hook.ts
@@ -0,0 +1,52 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+interface GerritElementExtensions {
+  content?: HTMLElement & {hidden?: boolean};
+  change?: unknown;
+  revision?: unknown;
+  token?: string;
+  repoName?: string;
+  /**
+   * This is a ConfigInfo object as defined here:
+   * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#config-info
+   * We neither want to repeat it nor add a dependency on it here.
+   */
+  config?: unknown;
+}
+
+export type HookCallback = (el: HTMLElement & GerritElementExtensions) => void;
+
+export interface RegisterOptions {
+  slot?: string;
+  replace: unknown;
+}
+
+export interface HookApi {
+  onAttached(callback: HookCallback): HookApi;
+
+  onDetached(callback: HookCallback): HookApi;
+
+  getAllAttached(): HTMLElement[];
+
+  getLastAttached(): Promise<HTMLElement>;
+
+  getModuleName(): string;
+
+  handleInstanceDetached(instance: HTMLElement): void;
+
+  handleInstanceAttached(instance: HTMLElement): void;
+}
diff --git a/polygerrit-ui/app/api/plugin.ts b/polygerrit-ui/app/api/plugin.ts
new file mode 100644
index 0000000..cd742a2
--- /dev/null
+++ b/polygerrit-ui/app/api/plugin.ts
@@ -0,0 +1,92 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {AdminPluginApi} from './admin';
+import {AnnotationPluginApi} from './annotation';
+import {AttributeHelperPluginApi} from './attribute-helper';
+import {ChangeMetadataPluginApi} from './change-metadata';
+import {ChangeReplyPluginApi} from './change-reply';
+import {ChecksPluginApi} from './checks';
+import {EventHelperPluginApi} from './event-helper';
+import {PopupPluginApi} from './popup';
+import {RepoPluginApi} from './repo';
+import {ReportingPluginApi} from './reporting';
+import {SettingsPluginApi} from './settings';
+import {StylesPluginApi} from './styles';
+import {ThemePluginApi} from './theme';
+import {ChangeActionsPluginApi} from './change-actions';
+import {RestPluginApi} from './rest';
+import {HookApi, RegisterOptions} from './hook';
+
+export enum TargetElement {
+  CHANGE_ACTIONS = 'changeactions',
+  REPLY_DIALOG = 'replydialog',
+}
+
+// Note: for new events, naming convention should be: `a-b`
+export enum EventType {
+  HISTORY = 'history',
+  LABEL_CHANGE = 'labelchange',
+  SHOW_CHANGE = 'showchange',
+  SUBMIT_CHANGE = 'submitchange',
+  SHOW_REVISION_ACTIONS = 'show-revision-actions',
+  COMMIT_MSG_EDIT = 'commitmsgedit',
+  COMMENT = 'comment',
+  REVERT = 'revert',
+  REVERT_SUBMISSION = 'revert_submission',
+  POST_REVERT = 'postrevert',
+  ANNOTATE_DIFF = 'annotatediff',
+  ADMIN_MENU_LINKS = 'admin-menu-links',
+  HIGHLIGHTJS_LOADED = 'highlightjs-loaded',
+}
+
+export interface PluginApi {
+  _url?: URL;
+  admin(): AdminPluginApi;
+  annotationApi(): AnnotationPluginApi;
+  attributeHelper(element: Element): AttributeHelperPluginApi;
+  changeActions(): ChangeActionsPluginApi;
+  changeMetadata(): ChangeMetadataPluginApi;
+  changeReply(): ChangeReplyPluginApi;
+  checks(): ChecksPluginApi;
+  eventHelper(element: Node): EventHelperPluginApi;
+  getPluginName(): string;
+  hook(endpointName: string, opt_options?: RegisterOptions): HookApi;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  on(eventName: EventType, target: any): void;
+  popup(): Promise<PopupPluginApi>;
+  popup(moduleName: string): Promise<PopupPluginApi>;
+  popup(moduleName?: string): Promise<PopupPluginApi | null>;
+  project(): RepoPluginApi;
+  registerCustomComponent(
+    endpointName: string,
+    moduleName?: string,
+    options?: RegisterOptions
+  ): HookApi;
+  registerDynamicCustomComponent(
+    endpointName: string,
+    moduleName?: string,
+    options?: RegisterOptions
+  ): HookApi;
+  registerStyleModule(endpoint: string, moduleName: string): void;
+  reporting(): ReportingPluginApi;
+  restApi(): RestPluginApi;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  screen(screenName: string, moduleName?: string): any;
+  settings(): SettingsPluginApi;
+  styles(): StylesPluginApi;
+  theme(): ThemePluginApi;
+}
diff --git a/polygerrit-ui/app/api/popup.ts b/polygerrit-ui/app/api/popup.ts
new file mode 100644
index 0000000..60772cc
--- /dev/null
+++ b/polygerrit-ui/app/api/popup.ts
@@ -0,0 +1,30 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface PopupPluginApi {
+  /**
+   * Opens the popup, inserts it into DOM over current UI.
+   * Creates the popup if not previously created. Creates popup content element,
+   * if it was provided with constructor.
+   */
+  open(): Promise<PopupPluginApi>;
+
+  /**
+   * Hides the popup.
+   */
+  close(): void;
+}
diff --git a/polygerrit-ui/app/api/repo.ts b/polygerrit-ui/app/api/repo.ts
new file mode 100644
index 0000000..a626471
--- /dev/null
+++ b/polygerrit-ui/app/api/repo.ts
@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export type RepoCommandCallback = (
+  repo?: string,
+  /**
+   * This is a ConfigInfo object as defined here:
+   * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#config-info
+   * We neither want to repeat it nor add a dependency on it here.
+   */
+  config?: unknown
+) => boolean;
+
+export interface RepoPluginApi {
+  createCommand(title: string, callback: RepoCommandCallback): RepoPluginApi;
+
+  onTap(callback: (event: Event) => boolean): RepoPluginApi;
+}
diff --git a/polygerrit-ui/app/api/reporting.ts b/polygerrit-ui/app/api/reporting.ts
new file mode 100644
index 0000000..65bdc3f
--- /dev/null
+++ b/polygerrit-ui/app/api/reporting.ts
@@ -0,0 +1,25 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export type EventDetails = any;
+
+export interface ReportingPluginApi {
+  reportInteraction(eventName: string, details?: EventDetails): void;
+
+  reportLifeCycle(eventName: string, details?: EventDetails): void;
+}
diff --git a/polygerrit-ui/app/api/rest.ts b/polygerrit-ui/app/api/rest.ts
new file mode 100644
index 0000000..fd9cada
--- /dev/null
+++ b/polygerrit-ui/app/api/rest.ts
@@ -0,0 +1,106 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export type RequestPayload = string | object;
+
+export enum HttpMethod {
+  HEAD = 'HEAD',
+  POST = 'POST',
+  GET = 'GET',
+  DELETE = 'DELETE',
+  PUT = 'PUT',
+}
+
+export type ErrorCallback = (response?: Response | null, err?: Error) => void;
+
+export interface RestPluginApi {
+  getLoggedIn(): Promise<boolean>;
+
+  getVersion(): Promise<string | undefined>;
+
+  /**
+   * Returns a ServerInfo object as defined here:
+   * https://gerrit-review.googlesource.com/Documentation/rest-api-config.html#server-info
+   * We neither want to repeat it nor add a dependency on it here.
+   */
+  getConfig(): Promise<unknown>;
+
+  invalidateReposCache(): void;
+
+  fetch(
+    method: HttpMethod,
+    url: string,
+    payload?: RequestPayload,
+    errFn?: undefined,
+    contentType?: string
+  ): Promise<Response>;
+
+  fetch(
+    method: HttpMethod,
+    url: string,
+    payload: RequestPayload | undefined,
+    errFn: ErrorCallback,
+    contentType?: string
+  ): Promise<Response | void>;
+
+  fetch(
+    method: HttpMethod,
+    url: string,
+    payload: RequestPayload | undefined,
+    errFn?: ErrorCallback,
+    contentType?: string
+  ): Promise<Response | void>;
+
+  /**
+   * Fetch and return native browser REST API Response.
+   */
+  fetch(
+    method: HttpMethod,
+    url: string,
+    payload?: RequestPayload,
+    errFn?: ErrorCallback,
+    contentType?: string
+  ): Promise<Response | void>;
+
+  /**
+   * Fetch and parse REST API response, if request succeeds.
+   */
+  send(
+    method: HttpMethod,
+    url: string,
+    payload?: RequestPayload,
+    errFn?: ErrorCallback,
+    contentType?: string
+  ): Promise<unknown>;
+
+  get(url: string): Promise<unknown>;
+
+  post(
+    url: string,
+    payload?: RequestPayload,
+    errFn?: ErrorCallback,
+    contentType?: string
+  ): Promise<unknown>;
+
+  put(
+    url: string,
+    payload?: RequestPayload,
+    errFn?: ErrorCallback,
+    contentType?: string
+  ): Promise<unknown>;
+
+  delete(url: string): Promise<Response>;
+}
diff --git a/polygerrit-ui/app/api/settings.ts b/polygerrit-ui/app/api/settings.ts
new file mode 100644
index 0000000..03cf474
--- /dev/null
+++ b/polygerrit-ui/app/api/settings.ts
@@ -0,0 +1,27 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {HookApi} from './hook';
+
+export interface SettingsPluginApi {
+  title(newTitle: string): SettingsPluginApi;
+
+  token(newToken: string): SettingsPluginApi;
+
+  module(newModuleName: string): SettingsPluginApi;
+
+  build(): HookApi;
+}
diff --git a/polygerrit-ui/app/api/styles.ts b/polygerrit-ui/app/api/styles.ts
new file mode 100644
index 0000000..233c3e2
--- /dev/null
+++ b/polygerrit-ui/app/api/styles.ts
@@ -0,0 +1,35 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface StyleObject {
+  /**
+   * Creates a new unique CSS class and injects it in a root node of the element
+   * if it hasn't been added yet. A root node is an document or is the
+   * associated shadowRoot. This class can be added to any element with the same
+   * root node.
+   */
+  getClassName(element: Element): string;
+
+  /**
+   * Apply shared style to the element.
+   */
+  apply(element: Element): void;
+}
+
+export interface StylesPluginApi {
+  css(ruleStr: string): StyleObject;
+}
diff --git a/polygerrit-ui/app/api/theme.ts b/polygerrit-ui/app/api/theme.ts
new file mode 100644
index 0000000..70ffcb3
--- /dev/null
+++ b/polygerrit-ui/app/api/theme.ts
@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface ThemePluginApi {
+  setHeaderLogoAndTitle(logoUrl: string, title: string): void;
+}
diff --git a/polygerrit-ui/app/constants/constants.ts b/polygerrit-ui/app/constants/constants.ts
index 03d5000..be502f7 100644
--- a/polygerrit-ui/app/constants/constants.ts
+++ b/polygerrit-ui/app/constants/constants.ts
@@ -403,12 +403,10 @@
 // (Render mode being at least one of them).
 export function createDefaultDiffPrefs(): DiffPreferencesInfo {
   return {
-    auto_hide_diff_table_header: true,
     context: 10,
     cursor_blink_rate: 0,
     font_size: 12,
     ignore_whitespace: 'IGNORE_NONE',
-    intraline_difference: true,
     line_length: 100,
     line_wrapping: false,
     show_line_endings: true,
@@ -416,7 +414,6 @@
     show_whitespace_errors: true,
     syntax_highlighting: true,
     tab_size: 8,
-    theme: 'DEFAULT',
   };
 }
 
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 3aeea3b..bc4750f 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
@@ -26,7 +26,6 @@
 import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {
   GroupInfo,
   AccountInfo,
@@ -35,6 +34,7 @@
 } from '../../../types/common';
 import {firePageError, fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 const GROUP_EVENTS = ['ADD_GROUP', 'REMOVE_GROUP'];
 
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 f5602a3..451139c 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
@@ -30,7 +30,6 @@
 import {htmlTemplate} from './gr-group-members_html';
 import {getBaseUrl} from '../../../utils/url-util';
 import {customElement, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {GrOverlay} from '../../shared/gr-overlay/gr-overlay';
 import {
   GroupId,
@@ -50,6 +49,7 @@
   fireTitleChange,
 } from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 const SUGGESTIONS_LIMIT = 15;
 const SAVING_ERROR_TEXT =
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 058f86b..6f00445 100644
--- a/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
@@ -32,13 +32,13 @@
   AutocompleteQuery,
 } from '../../shared/gr-autocomplete/gr-autocomplete';
 import {GroupId, GroupInfo, GroupName} from '../../../types/common';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {
   fireEvent,
   firePageError,
   fireTitleChange,
 } from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 const INTERNAL_GROUP_REGEX = /^[\da-f]{40}$/;
 
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 ceb08b6..fc1ceee 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
@@ -26,11 +26,11 @@
   ListViewParams,
 } from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {customElement, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {PluginInfo} from '../../../types/common';
 import {firePageError} from '../../../utils/event-util';
 import {fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 interface PluginInfoWithName extends PluginInfo {
   name: string;
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 9bc0466..14cf234 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
@@ -29,7 +29,6 @@
 import {htmlTemplate} from './gr-repo-commands_html';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {
   BranchName,
   ConfigInfo,
@@ -44,6 +43,7 @@
   fireTitleChange,
 } from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 const GC_MESSAGE = 'Garbage collection completed successfully.';
 const CONFIG_BRANCH = 'refs/meta/config' as BranchName;
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 b30d1f4..5f6cd29 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
@@ -24,9 +24,9 @@
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property} from '@polymer/decorators';
 import {RepoName, DashboardId, DashboardInfo} from '../../../types/common';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {firePageError} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 interface DashboardRef {
   section: string;
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
index 5325dc7..a486e27 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
@@ -35,7 +35,6 @@
 import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin';
 import {encodeURL} from '../../../utils/url-util';
 import {customElement, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {GrOverlay} from '../../shared/gr-overlay/gr-overlay';
 import {GrCreatePointerDialog} from '../gr-create-pointer-dialog/gr-create-pointer-dialog';
 import {
@@ -51,6 +50,7 @@
 import {RepoDetailView} from '../../core/gr-navigation/gr-navigation';
 import {firePageError} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
 
 const PGP_START = '-----BEGIN PGP SIGNATURE-----';
 
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 3543e3b..bcc6039 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
@@ -30,7 +30,6 @@
 import {htmlTemplate} from './gr-repo_html';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property, observe} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {
   ConfigInfo,
   RepoName,
@@ -47,6 +46,7 @@
 import {firePageError, fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
 import {WebLinkInfo} from '../../../types/diff';
+import {ErrorCallback} from '../../../api/rest';
 
 const STATES = {
   active: {value: ProjectState.ACTIVE, label: 'Active'},
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 903afaa..89ca4ef 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
@@ -50,17 +50,9 @@
   HttpMethod,
   NotifyType,
 } from '../../../constants/constants';
-import {
-  EventType as PluginEventType,
-  TargetElement,
-} from '../../plugins/gr-plugin-types';
+import {EventType as PluginEventType, TargetElement} from '../../../api/plugin';
 import {customElement, observe, property} from '@polymer/decorators';
 import {
-  ActionPriority,
-  ActionType,
-  ErrorCallback,
-} from '../../../services/gr-rest-api/gr-rest-api';
-import {
   AccountInfo,
   ActionInfo,
   ActionNameToActionInfoMap,
@@ -102,10 +94,7 @@
 import {PolymerDeepPropertyChange} from '@polymer/polymer/interfaces';
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {
-  ChangeActions,
   GrChangeActionsElement,
-  PrimaryActionKey,
-  RevisionActions,
   UIActionInfo,
 } from '../../shared/gr-js-api-interface/gr-change-actions-js-api';
 import {fireAlert} from '../../../utils/event-util';
@@ -116,6 +105,14 @@
 } from '../../../utils/label-util';
 import {CommentThread} from '../../../utils/comment-util';
 import {ShowAlertEventDetail} from '../../../types/events';
+import {
+  ActionPriority,
+  ActionType,
+  ChangeActions,
+  PrimaryActionKey,
+  RevisionActions,
+} from '../../../api/change-actions';
+import {ErrorCallback} from '../../../api/rest';
 
 const ERR_BRANCH_EMPTY = 'The destination branch can’t be empty.';
 const ERR_COMMIT_EMPTY = 'The commit message can’t be empty.';
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
index 918e5e4..c5c73c5 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
@@ -110,6 +110,15 @@
     .metadata-header {
       display: flex;
       justify-content: space-between;
+      align-items: flex-end;
+      /* The goal is to achieve alignment of the owner account chip and the
+         commit message box. Their top border should be on the same line. */
+      margin-bottom: var(--spacing-s);
+    }
+    .show-all-button iron-icon {
+      color: inherit;
+      --iron-icon-height: 18px;
+      --iron-icon-width: 18px;
     }
   </style>
   <gr-external-style id="externalStyle" name="change-metadata">
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
index 11f1050..59287b2 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
@@ -61,7 +61,7 @@
 import {RestApiService} from '../../../services/gr-rest-api/gr-rest-api';
 import {tap} from '@polymer/iron-test-helpers/mock-interactions';
 import {GrEditableLabel} from '../../shared/gr-editable-label/gr-editable-label';
-import {PluginApi} from '../../plugins/gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
 import {GrEndpointDecorator} from '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
 import {stubRestApi} from '../../../test/test-utils.js';
 import {ParsedChangeInfo} from '../../../types/types';
diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
index c03884e..c0e87f3 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
@@ -34,7 +34,6 @@
   LabelNameToInfoMap,
   LabelInfo,
 } from '../../../types/common';
-import {hasOwnProperty} from '../../../utils/common-util';
 import {PolymerDeepPropertyChange} from '@polymer/polymer/interfaces';
 import {appContext} from '../../../services/app-context';
 import {KnownExperimentId} from '../../../services/flags/flags';
@@ -51,6 +50,7 @@
 }
 
 interface Label {
+  labelName: string;
   labelInfo: LabelInfo;
   icon: string;
   style: string;
@@ -133,22 +133,19 @@
       LabelNameToInfoMap
     >
   ) {
-    const labels = labelsRecord.base;
-    this._optionalLabels = [];
-    this._requiredLabels = [];
+    const labels = labelsRecord.base || {};
+    const allLabels: Label[] = [];
 
-    for (const label of Object.keys(labels || {}).sort()) {
-      if (!hasOwnProperty(labels, label)) {
-        continue;
-      }
-
-      const labelInfo = labels[label];
-      const icon = this._computeLabelIcon(labelInfo);
-      const style = this._computeLabelClass(labelInfo);
-      const path = labelInfo.optional ? '_optionalLabels' : '_requiredLabels';
-
-      this.push(path, {label, icon, style, labelInfo});
+    for (const label of Object.keys(labels).sort()) {
+      allLabels.push({
+        labelName: label,
+        icon: this._computeLabelIcon(labels[label]),
+        style: this._computeLabelClass(labels[label]),
+        labelInfo: labels[label],
+      });
     }
+    this._optionalLabels = allLabels.filter(label => label.labelInfo.optional);
+    this._requiredLabels = allLabels.filter(label => !label.labelInfo.optional);
   }
 
   /**
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 310b8bf..f172ccc 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
@@ -138,7 +138,7 @@
         <gr-limited-text
           class="name"
           limit="25"
-          text="[[item.label]]"
+          text="[[item.labelName]]"
         ></gr-limited-text>
       </div>
       <div class="value">
@@ -146,7 +146,7 @@
           change="{{change}}"
           account="[[account]]"
           mutable="[[mutable]]"
-          label="[[item.label]]"
+          label="[[item.labelName]]"
           label-info="[[item.labelInfo]]"
         ></gr-label-info>
       </div>
@@ -206,7 +206,7 @@
         <gr-limited-text
           class="name"
           limit="25"
-          text="[[item.label]]"
+          text="[[item.labelName]]"
         ></gr-limited-text>
       </div>
       <div class="value">
@@ -214,7 +214,7 @@
           change="{{change}}"
           account="[[account]]"
           mutable="[[mutable]]"
-          label="[[item.label]]"
+          label="[[item.labelName]]"
           label-info="[[item.labelInfo]]"
         ></gr-label-info>
       </div>
diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_test.js b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_test.js
index c2fc72d..fda8cb2 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_test.js
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements_test.js
@@ -75,7 +75,7 @@
     assert.equal(element._optionalLabels.length, 1);
     assert.equal(element._requiredLabels.length, 1);
 
-    assert.equal(element._optionalLabels[0].label, 'opt_test');
+    assert.equal(element._optionalLabels[0].labelName, 'opt_test');
     assert.equal(element._optionalLabels[0].icon, 'gr-icons:schedule');
     assert.equal(element._optionalLabels[0].style, '');
     assert.ok(element._optionalLabels[0].labelInfo);
diff --git a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
index 88481a4..4af51a9 100644
--- a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
@@ -40,6 +40,7 @@
   iconForCategory,
   iconForStatus,
   isRunning,
+  isRunningOrHasCompleted,
 } from '../../../services/checks/checks-util';
 import {ChangeComments} from '../../diff/gr-comment-api/gr-comment-api';
 import {
@@ -47,12 +48,15 @@
   isResolved,
   isUnresolved,
   getFirstComment,
+  isRobotThread,
+  hasHumanReply,
 } from '../../../utils/comment-util';
 import {pluralize} from '../../../utils/string-util';
 import {AccountInfo} from '../../../types/common';
 import {notUndefined} from '../../../types/types';
 import {uniqueDefinedAvatar} from '../../../utils/account-util';
 import {PrimaryTab} from '../../../constants/constants';
+import {CommentTabState} from '../../../types/events';
 
 export enum SummaryChipStyles {
   INFO = 'info',
@@ -69,6 +73,9 @@
   @property()
   styleType = SummaryChipStyles.UNDEFINED;
 
+  @property()
+  category?: CommentTabState;
+
   static get styles() {
     return [
       sharedStyles,
@@ -77,8 +84,9 @@
           color: var(--chip-color);
           cursor: pointer;
           display: inline-block;
-          padding: var(--spacing-xxs) var(--spacing-s) var(--spacing-xxs)
+          padding: var(--spacing-xxs) var(--spacing-m) var(--spacing-xxs)
             var(--spacing-s);
+          margin-right: var(--spacing-s);
           border-radius: 12px;
           border: 1px solid gray;
           vertical-align: top;
@@ -129,7 +137,9 @@
   private handleClick(e: MouseEvent) {
     e.stopPropagation();
     e.preventDefault();
-    fireShowPrimaryTab(this, PrimaryTab.COMMENT_THREADS);
+    fireShowPrimaryTab(this, PrimaryTab.COMMENT_THREADS, true, {
+      commentTab: this.category,
+    });
   }
 }
 
@@ -279,6 +289,9 @@
         :host.new-change-summary-true {
           margin-bottom: var(--spacing-m);
         }
+        .zeroState {
+          color: var(--primary-text-color);
+        }
         td.key {
           padding-right: var(--spacing-l);
           padding-bottom: var(--spacing-m);
@@ -303,6 +316,11 @@
     ];
   }
 
+  renderChecksZeroState() {
+    if (this.runs.some(isRunningOrHasCompleted)) return;
+    return html`<span class="font-small zeroState">No results</span>`;
+  }
+
   renderChecksChipForCategory(category: Category) {
     const icon = iconForCategory(category);
     const runs = this.runs.filter(run => hasResultsOf(run, category));
@@ -372,9 +390,11 @@
 
   render() {
     this.detailsQuota = DETAILS_QUOTA;
-    const countResolvedComments =
-      this.commentThreads?.filter(isResolved).length ?? 0;
-    const unresolvedThreads = this.commentThreads?.filter(isUnresolved) ?? [];
+    const commentThreads =
+      this.commentThreads?.filter(t => !isRobotThread(t) || hasHumanReply(t)) ??
+      [];
+    const countResolvedComments = commentThreads.filter(isResolved).length;
+    const unresolvedThreads = commentThreads.filter(isUnresolved);
     const countUnresolvedComments = unresolvedThreads.length;
     const unresolvedAuthors = this.getAccounts(unresolvedThreads);
     const draftCount = this.changeComments?.computeDraftCount() ?? 0;
@@ -384,7 +404,7 @@
           <tr ?hidden=${!this.showChecksSummary}>
             <td class="key">Checks</td>
             <td class="value">
-              ${this.renderChecksChipForCategory(
+              ${this.renderChecksZeroState()}${this.renderChecksChipForCategory(
                 Category.ERROR
               )}${this.renderChecksChipForCategory(
                 Category.WARNING
@@ -399,23 +419,23 @@
           <tr ?hidden=${!this.newChangeSummaryUiEnabled}>
             <td class="key">Comments</td>
             <td class="value">
-              <gr-summary-chip
-                styleType=${SummaryChipStyles.INFO}
+              <span
+                class="font-small zeroState"
                 ?hidden=${!!countResolvedComments ||
                 !!draftCount ||
                 !!countUnresolvedComments}
               >
-                No Comments</gr-summary-chip
-              >
-              <gr-summary-chip
+                No Comments</span
+              ><gr-summary-chip
                 styleType=${SummaryChipStyles.WARNING}
+                category=${CommentTabState.DRAFTS}
                 icon="edit"
                 ?hidden=${!draftCount}
               >
                 ${pluralize(draftCount, 'draft')}</gr-summary-chip
-              >
-              <gr-summary-chip
+              ><gr-summary-chip
                 styleType=${SummaryChipStyles.WARNING}
+                category=${CommentTabState.UNRESOLVED}
                 icon="message"
                 ?hidden=${!countUnresolvedComments}
               >
@@ -428,9 +448,9 @@
                     ></gr-avatar>`
                 )}
                 ${countUnresolvedComments} unresolved</gr-summary-chip
-              >
-              <gr-summary-chip
+              ><gr-summary-chip
                 styleType=${SummaryChipStyles.CHECK}
+                category=${CommentTabState.SHOW_ALL}
                 icon="markChatRead"
                 ?hidden=${!countResolvedComments}
                 >${countResolvedComments} resolved</gr-summary-chip
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index 5afcafc..8f74f76 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
@@ -78,7 +78,7 @@
   PatchSet,
 } from '../../../utils/patch-set-util';
 import {changeStatuses, changeStatusString} from '../../../utils/change-util';
-import {EventType as PluginEventType} from '../../plugins/gr-plugin-types';
+import {EventType as PluginEventType} from '../../../api/plugin';
 import {customElement, property, observe} from '@polymer/decorators';
 import {GrApplyFixDialog} from '../../diff/gr-apply-fix-dialog/gr-apply-fix-dialog';
 import {GrFileListHeader} from '../gr-file-list-header/gr-file-list-header';
@@ -118,7 +118,7 @@
   GrCommentApi,
   ChangeComments,
 } from '../../diff/gr-comment-api/gr-comment-api';
-import {hasOwnProperty} from '../../../utils/common-util';
+import {assertIsDefined, hasOwnProperty} from '../../../utils/common-util';
 import {GrEditControls} from '../../edit/gr-edit-controls/gr-edit-controls';
 import {
   CommentThread,
@@ -152,11 +152,13 @@
   ShowAlertEventDetail,
   SwitchTabEvent,
   ThreadListModifiedEvent,
+  TabState,
 } from '../../../types/events';
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {GrMessagesList} from '../gr-messages-list/gr-messages-list';
 import {GrThreadList} from '../gr-thread-list/gr-thread-list';
 import {
+  EventType,
   fireAlert,
   fireEvent,
   firePageError,
@@ -555,6 +557,9 @@
   @property({type: Boolean})
   _isNewChangeSummaryUiEnabled = false;
 
+  @property({type: String})
+  _tabState?: TabState;
+
   restApiService = appContext.restApiService;
 
   checksService = appContext.checksService;
@@ -571,7 +576,6 @@
       [Shortcut.UP_TO_DASHBOARD]: '_handleUpToDashboard',
       [Shortcut.EXPAND_ALL_MESSAGES]: '_handleExpandAllMessages',
       [Shortcut.COLLAPSE_ALL_MESSAGES]: '_handleCollapseAllMessages',
-      [Shortcut.EXPAND_ALL_DIFF_CONTEXT]: '_expandAllDiffs',
       [Shortcut.OPEN_DIFF_PREFS]: '_handleOpenDiffPrefsShortcut',
       [Shortcut.EDIT_TOPIC]: '_handleEditTopic',
       [Shortcut.DIFF_AGAINST_BASE]: '_handleDiffAgainstBase',
@@ -694,7 +698,7 @@
     this.listen(window, 'scroll', '_handleScroll');
     this.listen(document, 'visibilitychange', '_handleVisibilityChange');
 
-    this.addEventListener('show-primary-tab', e =>
+    this.addEventListener(EventType.SHOW_PRIMARY_TAB, e =>
       this._setActivePrimaryTab(e)
     );
     this.addEventListener('show-secondary-tab', e =>
@@ -853,6 +857,7 @@
         this._selectedTabPluginHeader = '';
       }
     }
+    this._tabState = e.detail.tabState;
   }
 
   /**
@@ -878,7 +883,7 @@
   }
 
   _handleCommitMessageSave(e: EditableContentSaveEvent) {
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._changeNum)
       throw new Error('missing required changeNum property');
     // Trim trailing whitespace from each line.
@@ -1419,7 +1424,7 @@
   }
 
   _handleMessageAnchorTap(e: CustomEvent<{id: string}>) {
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     const hash = MSG_PREFIX + e.detail.id;
@@ -1701,7 +1706,7 @@
     if (this.shouldSuppressKeyboardShortcut(e)) {
       return;
     }
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     if (this._patchRange.basePatchNum === ParentPatchSetNum) {
@@ -1715,7 +1720,7 @@
     if (this.shouldSuppressKeyboardShortcut(e)) {
       return;
     }
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     if (this._patchRange.basePatchNum === ParentPatchSetNum) {
@@ -1729,7 +1734,7 @@
     if (this.shouldSuppressKeyboardShortcut(e)) {
       return;
     }
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     const latestPatchNum = computeLatestPatchNum(this._allPatchSets);
@@ -1748,7 +1753,7 @@
     if (this.shouldSuppressKeyboardShortcut(e)) {
       return;
     }
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     const latestPatchNum = computeLatestPatchNum(this._allPatchSets);
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
@@ -1767,7 +1772,7 @@
     if (this.shouldSuppressKeyboardShortcut(e)) {
       return;
     }
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     const latestPatchNum = computeLatestPatchNum(this._allPatchSets);
@@ -1913,7 +1918,7 @@
   }
 
   _getProjectConfig() {
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     return this.restApiService
       .getProjectConfig(this._change.project)
       .then(config => {
@@ -2309,7 +2314,7 @@
    * (`this._patchRange`) being defined.
    */
   _reloadPatchNumDependentResources(rightPatchNumChanged?: boolean) {
-    if (!this._changeNum) throw new Error('missing changeNum');
+    assertIsDefined(this._changeNum, '_changeNum');
     if (!this._patchRange?.patchNum) throw new Error('missing patchNum');
     const promises = [this._getCommitInfo(), this.$.fileList.reload()];
     if (rightPatchNumChanged)
@@ -2549,7 +2554,7 @@
     }
 
     this._updateCheckTimerHandle = this.async(() => {
-      if (!this._change) throw new Error('missing required change property');
+      assertIsDefined(this._change, '_change');
       const change = this._change;
       fetchChangeUpdates(change, this.restApiService).then(result => {
         let toastMessage = null;
@@ -2657,7 +2662,7 @@
       GrEditControls
     >('#editControls');
     if (!controls) throw new Error('Missing edit controls');
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     const path = e.detail.path;
@@ -2692,7 +2697,7 @@
     if (!this._selectedRevision) {
       return;
     }
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
 
     let patchNum: PatchSetNum;
     if (patchNumStr === 'edit') {
@@ -2740,7 +2745,7 @@
   }
 
   _handleStopEditTap() {
-    if (!this._change) throw new Error('missing required change property');
+    assertIsDefined(this._change, '_change');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     GerritNav.navigateToChange(this._change, this._patchRange.patchNum);
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
index 3c37ec7..56c1d38 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_html.ts
@@ -65,7 +65,7 @@
       margin-left: var(--spacing-s);
     }
     #replyBtn {
-      margin-bottom: var(--spacing-l);
+      margin-bottom: var(--spacing-m);
     }
     gr-change-star {
       margin-left: var(--spacing-s);
@@ -105,7 +105,7 @@
       font-size: var(--font-size-mono);
       line-height: var(--line-height-mono);
       margin-right: var(--spacing-l);
-      margin-bottom: var(--spacing-l);
+      margin-bottom: var(--spacing-s);
       /* Account for border and padding and rounding errors. */
       max-width: calc(72ch + 2px + 2 * var(--spacing-m) + 0.4px);
     }
@@ -548,6 +548,7 @@
                 <gr-related-changes-list-experimental
                   change="[[_change]]"
                   id="relatedChangesExperimental"
+                  patch-num="[[_computeLatestPatchNum(_allPatchSets)]]"
                 ></gr-related-changes-list-experimental>
               </template>
               <template is="dom-if" if="[[!_isNewChangeSummaryUiEnabled]]">
@@ -679,8 +680,10 @@
           change="[[_change]]"
           change-num="[[_changeNum]]"
           logged-in="[[_loggedIn]]"
+          comment-tab-state="[[_tabState.commentTab]]"
           only-show-robot-comments-with-human-reply=""
           unresolved-only
+          show-comment-context
         ></gr-thread-list>
       </template>
       <template
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
index b9e925c..99e5356 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
@@ -33,7 +33,7 @@
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader';
 import {_testOnly_initGerritPluginApi} from '../../shared/gr-js-api-interface/gr-gerrit';
-import {EventType, PluginApi} from '../../plugins/gr-plugin-types';
+import {EventType, PluginApi} from '../../../api/plugin';
 
 import 'lodash/lodash';
 import {
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts
index fae920d..99094d2 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog_html.ts
@@ -53,7 +53,7 @@
           <template is="dom-if" if="[[change.is_private]]">
             <p>
               <iron-icon
-                icon="gr-icons:error"
+                icon="gr-icons:warning"
                 class="warningBeforeSubmit"
               ></iron-icon>
               <strong>Heads Up!</strong>
@@ -63,7 +63,7 @@
           <template is="dom-if" if="[[change.unresolved_comment_count]]">
             <p>
               <iron-icon
-                icon="gr-icons:error"
+                icon="gr-icons:warning"
                 class="warningBeforeSubmit"
               ></iron-icon>
               [[_computeUnresolvedCommentsWarning(change)]]
@@ -80,7 +80,7 @@
           </template>
           <template is="dom-if" if="[[_computeHasChangeEdit(change)]]">
             <iron-icon
-              icon="gr-icons:error"
+              icon="gr-icons:warning"
               class="warningBeforeSubmit"
             ></iron-icon>
             Your unpublished edit will not be submitted. Did you forget to click
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 2d38dcc..285b73f 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
@@ -1374,12 +1374,10 @@
         line_length: 100,
         cursor_blink_rate: 0,
         line_wrapping: false,
-        intraline_difference: true,
         show_line_endings: true,
         show_tabs: true,
         show_whitespace_errors: true,
         syntax_highlighting: true,
-        auto_hide_diff_table_header: true,
         theme: 'DEFAULT',
         ignore_whitespace: 'IGNORE_NONE',
       };
diff --git a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts
index f8cd42c..a966186 100644
--- a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts
+++ b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts
@@ -32,11 +32,12 @@
 } from '../../../types/common';
 import {
   GrLabelScoreRow,
+  Label,
   LabelValuesMap,
 } from '../gr-label-score-row/gr-label-score-row';
 import {PolymerDeepPropertyChange} from '@polymer/polymer/interfaces';
+import {appContext} from '../../../services/app-context';
 
-type Labels = {[label: string]: number};
 @customElement('gr-label-scores')
 export class GrLabelScores extends GestureEventListeners(
   LegacyElementMixin(PolymerElement)
@@ -46,7 +47,7 @@
   }
 
   @property({type: Array, computed: '_computeLabels(change.labels.*, account)'})
-  _labels?: Labels;
+  _labels: Label[] = [];
 
   @property({type: Object, observer: '_computeColumns'})
   permittedLabels?: LabelNameToValueMap;
@@ -60,6 +61,8 @@
   @property({type: Object})
   _labelValues?: LabelValuesMap;
 
+  private readonly reporting = appContext.reportingService;
+
   getLabelValues(includeDefaults = true): LabelNameToValuesMap {
     const labels: LabelNameToValuesMap = {};
     if (this.shadowRoot === null || !this.change) {
@@ -69,23 +72,14 @@
       const selectorEl = this.shadowRoot.querySelector(
         `gr-label-score-row[name="${label}"]`
       ) as null | GrLabelScoreRow;
-      if (!selectorEl) {
-        continue;
-      }
-
-      // The user may have not voted on this label.
-      if (!selectorEl.selectedItem) {
-        continue;
-      }
+      if (!selectorEl?.selectedItem) continue;
 
       const selectedVal =
         typeof selectorEl.selectedValue === 'string'
           ? Number(selectorEl.selectedValue)
           : selectorEl.selectedValue;
 
-      if (selectedVal === undefined) {
-        continue;
-      }
+      if (selectedVal === undefined) continue;
 
       const defValNum = this._getDefaultValue(this.change.labels, label);
       if (includeDefaults || selectedVal !== defValNum) {
@@ -99,14 +93,18 @@
     labels: LabelNameToInfoMap,
     labelName: string,
     numberValue?: number
-  ) {
+  ): string {
     const detailedInfo = labels[labelName] as DetailedLabelInfo;
-    for (const labelValue of Object.keys(detailedInfo.values)) {
-      if (Number(labelValue) === numberValue) {
-        return labelValue;
+    if (detailedInfo.values) {
+      for (const labelValue of Object.keys(detailedInfo.values)) {
+        if (Number(labelValue) === numberValue) {
+          return labelValue;
+        }
       }
     }
-    return numberValue;
+    const stringVal = `${numberValue}`;
+    this.reporting.reportExecution('label-value-not-found', {value: stringVal});
+    return stringVal;
   }
 
   _getDefaultValue(labels?: LabelNameToInfoMap, labelName?: string) {
@@ -119,7 +117,7 @@
     labels: LabelNameToInfoMap | undefined,
     labelName: string,
     account?: AccountInfo
-  ) {
+  ): string | null {
     if (!labels) return null;
     const votes = labels[labelName] as DetailedLabelInfo;
     if (votes.all && votes.all.length > 0) {
@@ -144,16 +142,10 @@
       LabelNameToInfoMap
     >,
     account?: AccountInfo
-  ) {
-    // Polymer 2: check for undefined
-    if ([labelRecord, account].includes(undefined)) {
-      return undefined;
-    }
-
+  ): Label[] {
+    if (!account) return [];
+    if (!labelRecord?.base) return [];
     const labelsObj = labelRecord.base;
-    if (!labelsObj) {
-      return [];
-    }
     return Object.keys(labelsObj)
       .sort()
       .map(key => {
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
index 6515af0..0409a42 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
@@ -259,6 +259,7 @@
               change-num="[[changeNum]]"
               logged-in="[[_loggedIn]]"
               hide-toggle-buttons
+              show-comment-context
             >
             </gr-thread-list>
           </template>
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-change.ts b/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-change.ts
new file mode 100644
index 0000000..3ed545e
--- /dev/null
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list-experimental/gr-related-change.ts
@@ -0,0 +1,197 @@
+/**
+ * @license
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {html} from 'lit-html';
+import {GrLitElement} from '../../lit/gr-lit-element';
+import {customElement, property, css} from 'lit-element';
+import {sharedStyles} from '../../../styles/shared-styles';
+import {
+  ChangeInfo,
+  RelatedChangeAndCommitInfo,
+  CommitId,
+} from '../../../types/common';
+import {ChangeStatus} from '../../../constants/constants';
+import {isChangeInfo} from '../../../utils/change-util';
+
+@customElement('gr-related-change')
+export class GrRelatedChange extends GrLitElement {
+  @property()
+  change?: ChangeInfo | RelatedChangeAndCommitInfo;
+
+  @property()
+  href?: string;
+
+  @property()
+  isCurrentChange = false;
+
+  @property()
+  showSubmittableCheck = false;
+
+  @property()
+  showChangeStatus = false;
+
+  /*
+   * Needed for calculation if change is direct or indirect ancestor/descendant
+   * to current change.
+   */
+  @property()
+  connectedRevisions?: CommitId[];
+
+  static get styles() {
+    return [
+      sharedStyles,
+      css`
+        a {
+          display: block;
+        }
+        .changeContainer,
+        a {
+          max-width: 100%;
+          overflow: hidden;
+          text-overflow: ellipsis;
+          white-space: nowrap;
+        }
+        .changeContainer {
+          display: flex;
+        }
+        .strikethrough {
+          color: var(--deemphasized-text-color);
+          text-decoration: line-through;
+        }
+        .status {
+          color: var(--deemphasized-text-color);
+          font-weight: var(--font-weight-bold);
+          margin-left: var(--spacing-xs);
+        }
+        .notCurrent {
+          color: #e65100;
+        }
+        .indirectAncestor {
+          color: #33691e;
+        }
+        .submittableCheck {
+          padding-left: var(--spacing-s);
+          color: var(--positive-green-text-color);
+          display: none;
+        }
+        .submittableCheck.submittable {
+          display: inline;
+        }
+        .hidden,
+        .mobile {
+          display: none;
+        }
+        .submittableCheck {
+          padding-left: var(--spacing-s);
+          color: var(--positive-green-text-color);
+          display: none;
+        }
+        .submittableCheck.submittable {
+          display: inline;
+        }
+        .arrowToCurrentChange {
+          position: absolute;
+        }
+      `,
+    ];
+  }
+
+  render() {
+    const change = this.change;
+    if (!change) throw new Error('Missing change');
+    const linkClass = this._computeLinkClass(change);
+    return html`<span
+        role="img"
+        class="arrowToCurrentChange"
+        aria-label="Arrow marking current change"
+        ?hidden=${!this.isCurrentChange}
+        >➔</span
+      >
+      <div class="changeContainer">
+        <a href="${this.href}" class="${linkClass}"><slot></slot></a>
+        ${this.showSubmittableCheck
+          ? html`<span
+              tabindex="-1"
+              title="Submittable"
+              class="submittableCheck ${linkClass}"
+              role="img"
+              aria-label="Submittable"
+              >✓</span
+            >`
+          : ''}
+        ${this.showChangeStatus && !isChangeInfo(change)
+          ? html`<span class="${this._computeChangeStatusClass(change)}">
+              (${this._computeChangeStatus(change)})
+            </span>`
+          : ''}
+      </div> `;
+  }
+
+  _computeLinkClass(change: ChangeInfo | RelatedChangeAndCommitInfo) {
+    const statuses = [];
+    if (change.status === ChangeStatus.ABANDONED) {
+      statuses.push('strikethrough');
+    }
+    if (change.submittable) {
+      statuses.push('submittable');
+    }
+    return statuses.join(' ');
+  }
+
+  _computeChangeStatusClass(change: RelatedChangeAndCommitInfo) {
+    const classes = ['status'];
+    if (change._revision_number !== change._current_revision_number) {
+      classes.push('notCurrent');
+    } else if (this._isIndirectAncestor(change)) {
+      classes.push('indirectAncestor');
+    } else if (change.submittable) {
+      classes.push('submittable');
+    } else if (change.status === ChangeStatus.NEW) {
+      classes.push('hidden');
+    }
+    return classes.join(' ');
+  }
+
+  _computeChangeStatus(change: RelatedChangeAndCommitInfo) {
+    switch (change.status) {
+      case ChangeStatus.MERGED:
+        return 'Merged';
+      case ChangeStatus.ABANDONED:
+        return 'Abandoned';
+    }
+    if (change._revision_number !== change._current_revision_number) {
+      return 'Not current';
+    } else if (this._isIndirectAncestor(change)) {
+      return 'Indirect ancestor';
+    } else if (change.submittable) {
+      return 'Submittable';
+    }
+    return '';
+  }
+
+  _isIndirectAncestor(change: RelatedChangeAndCommitInfo) {
+    return (
+      this.connectedRevisions &&
+      !this.connectedRevisions.includes(change.commit.commit)
+    );
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    'gr-related-change': GrRelatedChange;
+  }
+}
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 5134b72..fbbef12 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
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 import {html, nothing} from 'lit-html';
+import './gr-related-change';
 import {classMap} from 'lit-html/directives/class-map';
 import {GrLitElement} from '../../lit/gr-lit-element';
 import {customElement, property, css} from 'lit-element';
@@ -23,18 +24,15 @@
   SubmittedTogetherInfo,
   ChangeInfo,
   RelatedChangeAndCommitInfo,
+  RelatedChangesInfo,
+  PatchSetNum,
+  CommitId,
 } from '../../../types/common';
 import {appContext} from '../../../services/app-context';
 import {ParsedChangeInfo} from '../../../types/types';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {pluralize} from '../../../utils/string-util';
-import {ChangeStatus} from '../../../constants/constants';
-
-function isChangeInfo(
-  x: ChangeInfo | RelatedChangeAndCommitInfo | ParsedChangeInfo
-): x is ChangeInfo | ParsedChangeInfo {
-  return (x as ChangeInfo)._number !== undefined;
-}
+import {getRevisionKey, isChangeInfo} from '../../../utils/change-util';
 
 /** What is the maximum number of shown changes in collapsed list? */
 const MAX_CHANGES_WHEN_COLLAPSED = 3;
@@ -44,74 +42,120 @@
   @property()
   change?: ParsedChangeInfo;
 
+  @property({type: String})
+  patchNum?: PatchSetNum;
+
   @property()
   _submittedTogether?: SubmittedTogetherInfo = {
     changes: [],
     non_visible_changes: 0,
   };
 
+  @property()
+  _relatedResponse?: RelatedChangesInfo = {changes: []};
+
   private readonly restApiService = appContext.restApiService;
 
   static get styles() {
     return [
       sharedStyles,
       css`
-        .title {
-          font-weight: var(--font-weight-bold);
-          color: var(--deemphasized-text-color);
-          padding-left: var(--metadata-horizontal-padding);
-        }
-        h4 {
-          display: flex;
-        }
-        /* This is a hacky solution from old gr-related-change-list
-         * TODO(milutin): find layout without needing it
-         */
-        h4:before,
-        gr-related-change:before {
-          content: ' ';
-          flex-shrink: 0;
-          width: 1.2em;
-        }
         .note {
           color: var(--error-text-color);
         }
+        section {
+          margin-bottom: var(--spacing-m);
+        }
       `,
     ];
   }
 
   render() {
+    const relatedChanges = this._relatedResponse?.changes ?? [];
+    let showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
+      relatedChanges.length,
+      relatedChanges.findIndex(relatedChange =>
+        this._changesEqual(relatedChange, this.change)
+      )
+    );
+    const connectedRevisions = this._computeConnectedRevisions(
+      this.change,
+      this.patchNum,
+      relatedChanges
+    );
+    const relatedChangeSection = html` <section
+      class="relatedChanges"
+      ?hidden=${!relatedChanges.length}
+    >
+      <gr-related-collapse
+        title="Relation chain"
+        .length=${relatedChanges.length}
+      >
+        ${relatedChanges.map(
+          (change, index) =>
+            html`<gr-related-change
+              class="${classMap({
+                ['show-when-collapsed']: showWhenCollapsedPredicate(index),
+              })}"
+              .isCurrentChange="${this._changesEqual(change, this.change)}"
+              .change="${change}"
+              .connectedRevisions="${connectedRevisions}"
+              .href="${change?._change_number
+                ? GerritNav.getUrlForChangeById(
+                    change._change_number,
+                    change.project,
+                    change._revision_number as PatchSetNum
+                  )
+                : ''}"
+              .showChangeStatus=${true}
+              >${change.commit.subject}</gr-related-change
+            >`
+        )}
+      </gr-related-collapse>
+    </section>`;
+
     const submittedTogetherChanges = this._submittedTogether?.changes ?? [];
     const countNonVisibleChanges =
       this._submittedTogether?.non_visible_changes ?? 0;
-    const showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
+    showWhenCollapsedPredicate = this.showWhenCollapsedPredicateFactory(
       submittedTogetherChanges.length,
       submittedTogetherChanges.findIndex(relatedChange =>
         this._changesEqual(relatedChange, this.change)
       )
     );
-    return html` <section
+    const submittedTogetherSection = html`<section
       id="submittedTogether"
       ?hidden=${!submittedTogetherChanges?.length &&
       !this._submittedTogether?.non_visible_changes}
     >
-      <h4 class="title">Submitted together</h4>
-      <gr-related-collapse .length=${submittedTogetherChanges.length}>
+      <gr-related-collapse
+        title="Submitted together"
+        .length=${submittedTogetherChanges.length}
+      >
         ${submittedTogetherChanges.map(
-          (relatedChange, index) =>
+          (change, index) =>
             html`<gr-related-change
               class="${classMap({
                 ['show-when-collapsed']: showWhenCollapsedPredicate(index),
               })}"
-              .currentChange="${this._changesEqual(relatedChange, this.change)}"
-              .change="${relatedChange}"
-            ></gr-related-change>`
+              .isCurrentChange="${this._changesEqual(change, this.change)}"
+              .change="${change}"
+              .href="${GerritNav.getUrlForChangeById(
+                change._number,
+                change.project
+              )}"
+              .showSubmittableCheck=${true}
+              >${change.project}: ${change.branch}:
+              ${change.subject}</gr-related-change
+            >`
         )}
       </gr-related-collapse>
       <div class="note" ?hidden=${!countNonVisibleChanges}>
         (+ ${pluralize(countNonVisibleChanges, 'non-visible change')})
       </div>
     </section>`;
+
+    return html`${relatedChangeSection}${submittedTogetherSection}`;
   }
 
   showWhenCollapsedPredicateFactory(length: number, highlightIndex: number) {
@@ -128,11 +172,24 @@
 
   reload() {
     if (!this.change) return Promise.reject(new Error('change missing'));
-    return this.restApiService
-      .getChangesSubmittedTogether(this.change._number)
-      .then(response => {
-        this._submittedTogether = response;
-      });
+    if (!this.patchNum) return Promise.reject(new Error('patchNum missing'));
+    const promises: Array<Promise<void>> = [
+      this.restApiService
+        .getRelatedChanges(this.change._number, this.patchNum)
+        .then(response => {
+          if (!response) {
+            throw new Error('getRelatedChanges returned undefined response');
+          }
+          this._relatedResponse = response;
+        }),
+      this.restApiService
+        .getChangesSubmittedTogether(this.change._number)
+        .then(response => {
+          this._submittedTogether = response;
+        }),
+    ];
+
+    return Promise.all(promises);
   }
 
   /**
@@ -165,11 +222,54 @@
     }
     return change._change_number;
   }
+
+  /*
+   * A list of commit ids connected to change to understand if other change
+   * is direct or indirect ancestor / descendant.
+   */
+  _computeConnectedRevisions(
+    change?: ParsedChangeInfo,
+    patchNum?: PatchSetNum,
+    relatedChanges?: RelatedChangeAndCommitInfo[]
+  ) {
+    if (!patchNum || !relatedChanges || !change) {
+      return [];
+    }
+
+    const connected: CommitId[] = [];
+    const changeRevision = getRevisionKey(change, patchNum);
+    const commits = relatedChanges.map(c => c.commit);
+    let pos = commits.length - 1;
+
+    while (pos >= 0) {
+      const commit: CommitId = commits[pos].commit;
+      connected.push(commit);
+      // TODO(TS): Ensure that both (commit and changeRevision) are string and use === instead
+      // eslint-disable-next-line eqeqeq
+      if (commit == changeRevision) {
+        break;
+      }
+      pos--;
+    }
+    while (pos >= 0) {
+      for (let i = 0; i < commits[pos].parents.length; i++) {
+        if (connected.includes(commits[pos].parents[i].commit)) {
+          connected.push(commits[pos].commit);
+          break;
+        }
+      }
+      --pos;
+    }
+    return connected;
+  }
 }
 
 @customElement('gr-related-collapse')
 export class GrRelatedCollapse extends GrLitElement {
   @property()
+  title = '';
+
+  @property()
   showAll = false;
 
   @property()
@@ -179,10 +279,24 @@
     return [
       sharedStyles,
       css`
+        .title {
+          font-weight: var(--font-weight-bold);
+          color: var(--deemphasized-text-color);
+          padding-left: var(--metadata-horizontal-padding);
+        }
+        h4 {
+          display: flex;
+          align-self: flex-end;
+        }
         gr-button {
           display: flex;
         }
-        gr-button:before {
+        /* This is a hacky solution from old gr-related-change-list
+         * TODO(milutin): find layout without needing it
+         */
+        h4:before,
+        gr-button:before,
+        ::slotted(gr-related-change):before {
           content: ' ';
           flex-shrink: 0;
           width: 1.2em;
@@ -196,31 +310,46 @@
         ::slotted(gr-related-change) {
           display: flex;
         }
+        gr-button iron-icon {
+          color: inherit;
+          --iron-icon-height: 18px;
+          --iron-icon-width: 18px;
+        }
+        .container {
+          justify-content: space-between;
+          display: flex;
+          margin-bottom: var(--spacing-s);
+        }
       `,
     ];
   }
 
   render() {
+    const title = html`<h4 class="title">${this.title}</h4>`;
+
     const collapsible = this.length > MAX_CHANGES_WHEN_COLLAPSED;
     const items = html` <div
       class="${!this.showAll && collapsible ? 'collapsed' : ''}"
     >
       <slot></slot>
     </div>`;
+
     let button = nothing;
     if (collapsible) {
       if (this.showAll) {
         button = html`<gr-button link="" @click="${this.toggle}"
-          >Show less</gr-button
-        >`;
+          >Show less<iron-icon icon="gr-icons:expand-less"></iron-icon
+        ></gr-button>`;
       } else {
         button = html`<gr-button link="" @click="${this.toggle}"
-          >+ ${this.length - MAX_CHANGES_WHEN_COLLAPSED} more</gr-button
-        >`;
+          >Show all (${this.length})
+          <iron-icon icon="gr-icons:expand-more"></iron-icon
+        ></gr-button>`;
       }
     }
 
-    return html`${items}${button}`;
+    return html`<div class="container">${title}${button}</div>
+      ${items}`;
   }
 
   private toggle(e: MouseEvent) {
@@ -229,97 +358,9 @@
   }
 }
 
-@customElement('gr-related-change')
-export class GrRelatedChange extends GrLitElement {
-  @property()
-  change?: ChangeInfo;
-
-  @property()
-  currentChange = false;
-
-  static get styles() {
-    return [
-      sharedStyles,
-      css`
-        a {
-          display: block;
-        }
-        .changeContainer,
-        a {
-          max-width: 100%;
-          overflow: hidden;
-          text-overflow: ellipsis;
-          white-space: nowrap;
-        }
-        .changeContainer {
-          display: flex;
-        }
-        .strikethrough {
-          color: var(--deemphasized-text-color);
-          text-decoration: line-through;
-        }
-        .submittableCheck {
-          padding-left: var(--spacing-s);
-          color: var(--positive-green-text-color);
-          display: none;
-        }
-        .submittableCheck.submittable {
-          display: inline;
-        }
-        .arrowToCurrentChange {
-          position: absolute;
-        }
-      `,
-    ];
-  }
-
-  render() {
-    const change = this.change;
-    if (!change) throw new Error('Missing change');
-    const linkClass = this._computeLinkClass(change);
-    return html`<span
-        role="img"
-        class="arrowToCurrentChange"
-        aria-label="Arrow marking current change"
-        ?hidden=${!this.currentChange}
-        >➔</span
-      >
-      <div class="changeContainer">
-        <a
-          href="${GerritNav.getUrlForChangeById(
-            change._number,
-            change.project
-          )}"
-          class="${linkClass}"
-          >${change.project}: ${change.branch}: ${change.subject}</a
-        >
-        <span
-          tabindex="-1"
-          title="Submittable"
-          class="submittableCheck ${linkClass}"
-          role="img"
-          aria-label="Submittable"
-          >✓</span
-        >
-      </div> `;
-  }
-
-  _computeLinkClass(change: ChangeInfo) {
-    const statuses = [];
-    if (change.status === ChangeStatus.ABANDONED) {
-      statuses.push('strikethrough');
-    }
-    if (change.submittable) {
-      statuses.push('submittable');
-    }
-    return statuses.join(' ');
-  }
-}
-
 declare global {
   interface HTMLElementTagNameMap {
     'gr-related-changes-list-experimental': GrRelatedChangesListExperimental;
     'gr-related-collapse': GrRelatedCollapse;
-    'gr-related-change': GrRelatedChange;
   }
 }
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts
index 4ad99d5..5705c4f 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.ts
@@ -26,7 +26,11 @@
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {ChangeStatus} from '../../../constants/constants';
 
-import {changeIsOpen, getRevisionKey} from '../../../utils/change-util';
+import {
+  changeIsOpen,
+  getRevisionKey,
+  isChangeInfo,
+} from '../../../utils/change-util';
 import {getPluginEndpoints} from '../../shared/gr-js-api-interface/gr-plugin-endpoints';
 import {customElement, observe, property} from '@polymer/decorators';
 import {
@@ -48,12 +52,6 @@
   return {changes: [], non_visible_changes: 0};
 }
 
-function isChangeInfo(
-  x: ChangeInfo | RelatedChangeAndCommitInfo
-): x is ChangeInfo {
-  return (x as ChangeInfo)._number !== undefined;
-}
-
 @customElement('gr-related-changes-list')
 export class GrRelatedChangesList extends GestureEventListeners(
   LegacyElementMixin(PolymerElement)
@@ -113,6 +111,8 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly reportingService = appContext.reportingService;
+
   clear() {
     this.loading = true;
     this.hidden = true;
@@ -440,6 +440,27 @@
   _computeNonVisibleChangesNote(n: number) {
     return `(+ ${pluralize(n, 'non-visible change')})`;
   }
+
+  // TODO(milutin): Temporary for data collection, remove when data collected
+  _reportClick(e: Event) {
+    const target = e.target as HTMLAnchorElement | undefined;
+    const section = target?.parentElement?.parentElement;
+    const sectionName = section?.getElementsByTagName('h4')[0]?.innerText;
+    const sectionLinks = [...(section?.getElementsByTagName('a') ?? [])];
+    const currentChange = section
+      ?.getElementsByClassName('arrowToCurrentChange')[0]
+      ?.nextElementSibling?.nextElementSibling?.getElementsByTagName('a')[0];
+
+    if (!target) return;
+    this.reportingService.reportInteraction('related-change-click', {
+      sectionName,
+      index: sectionLinks.indexOf(target) + 1,
+      countChanges: sectionLinks.length,
+      currentChangeIndex: !currentChange
+        ? undefined
+        : sectionLinks.indexOf(currentChange) + 1,
+    });
+  }
 }
 
 declare global {
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 0f42028..8cb0638 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
@@ -117,6 +117,7 @@
               href$="[[_computeChangeURL(related._change_number, related.project, related._revision_number)]]"
               class$="[[_computeLinkClass(related)]]"
               title$="[[related.commit.subject]]"
+              on-click="_reportClick"
             >
               [[related.commit.subject]]
             </a>
@@ -149,6 +150,7 @@
               href$="[[_computeChangeURL(related._number, related.project)]]"
               class$="[[_computeLinkClass(related)]]"
               title$="[[related.project]]: [[related.branch]]: [[related.subject]]"
+              on-click="_reportClick"
             >
               [[related.project]]: [[related.branch]]: [[related.subject]]
             </a>
@@ -176,6 +178,7 @@
               href$="[[_computeChangeURL(change._number, change.project)]]"
               class$="[[_computeLinkClass(change)]]"
               title$="[[change.project]]: [[change.branch]]: [[change.subject]]"
+              on-click="_reportClick"
             >
               [[change.project]]: [[change.branch]]: [[change.subject]]
             </a>
@@ -204,6 +207,7 @@
               href$="[[_computeChangeURL(change._number, change.project)]]"
               class$="[[_computeLinkClass(change)]]"
               title$="[[change.branch]]: [[change.subject]]"
+              on-click="_reportClick"
             >
               [[change.branch]]: [[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 e5396c3..705a402 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
@@ -46,9 +46,8 @@
 import {accountKey, removeServiceUsers} from '../../../utils/account-util';
 import {getDisplayName} from '../../../utils/display-name-util';
 import {IronA11yAnnouncer} from '@polymer/iron-a11y-announcer/iron-a11y-announcer';
-import {TargetElement} from '../../plugins/gr-plugin-types';
+import {TargetElement} from '../../../api/plugin';
 import {customElement, observe, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {FixIronA11yAnnouncer} from '../../../types/types';
 import {
   AccountAddition,
@@ -93,6 +92,7 @@
 } from '@polymer/polymer/interfaces';
 import {
   areSetsEqual,
+  assertIsDefined,
   assertNever,
   containsAll,
 } from '../../../utils/common-util';
@@ -110,6 +110,7 @@
 import {isUnresolved} from '../../../utils/comment-util';
 import {pluralize} from '../../../utils/string-util';
 import {fireAlert, fireEvent, fireServerError} from '../../../utils/event-util';
+import {ErrorCallback} from '../../../api/rest';
 
 const STORAGE_DEBOUNCE_INTERVAL_MS = 400;
 
@@ -137,7 +138,7 @@
 };
 
 const ButtonTooltips = {
-  SAVE: 'Save but do not send notification or change review state',
+  SAVE: 'Send changes and comments as work in progress but do not start review',
   START_REVIEW: 'Mark as ready for review and send reply',
   SEND: 'Send reply',
   DISABLED_COMMENT_EDITING: 'Save draft comments to enable send',
@@ -433,7 +434,7 @@
   }
 
   open(focusTarget?: FocusTarget) {
-    if (!this.change) throw new Error('missing required change property');
+    assertIsDefined(this.change, 'change');
     this.knownLatestState = LatestPatchState.CHECKING;
     fetchChangeUpdates(this.change, this.restApiService).then(result => {
       this.knownLatestState = result.isLatest
@@ -605,7 +606,7 @@
     account: AccountInfoInput | GroupInfoInput,
     type: ReviewerType
   ) {
-    if (!this.change) throw new Error('missing required change property');
+    assertIsDefined(this.change, 'change');
     if (account._pendingAdd || !isAccount(account)) {
       return;
     }
@@ -1213,7 +1214,7 @@
   }
 
   cancel() {
-    if (!this.change) throw new Error('missing required change property');
+    assertIsDefined(this.change, 'change');
     if (!this._owner) throw new Error('missing required _owner property');
     this.dispatchEvent(
       new CustomEvent('cancel', {
@@ -1269,8 +1270,8 @@
   }
 
   _saveReview(review: ReviewInput, errFn?: ErrorCallback) {
-    if (!this.change) throw new Error('missing required change property');
-    if (!this.patchNum) throw new Error('missing required patchNum property');
+    assertIsDefined(this.change, 'change');
+    assertIsDefined(this.patchNum, 'patchNum');
     return this.restApiService.saveChangeReview(
       this.change._number,
       this.patchNum,
@@ -1316,7 +1317,7 @@
   }
 
   _getStorageLocation(): StorageLocation {
-    if (!this.change) throw new Error('missing required change property');
+    assertIsDefined(this.change, 'change');
     return {
       changeNum: this.change._number,
       patchNum: '@change',
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
index 1235512..79569bc 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
@@ -577,7 +577,7 @@
               has-tooltip=""
               title="[[_saveTooltip]]"
               on-click="_saveClickHandler"
-              >Save</gr-button
+              >Send As WIP</gr-button
             >
           </template>
           <gr-button
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
index 7cea964..f0ec7cd 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
@@ -34,14 +34,17 @@
 import {
   CommentThread,
   isDraft,
-  UIRobot,
   isUnresolved,
   isDraftThread,
+  isRobotThread,
+  hasHumanReply,
 } from '../../../utils/comment-util';
 import {pluralize} from '../../../utils/string-util';
 import {fireThreadListModifiedEvent} from '../../../utils/event-util';
 import {KnownExperimentId} from '../../../services/flags/flags';
 import {appContext} from '../../../services/app-context';
+import {assertNever} from '../../../utils/common-util';
+import {CommentTabState} from '../../../types/events';
 
 interface CommentThreadWithInfo {
   thread: CommentThread;
@@ -76,6 +79,9 @@
   @property({type: Array})
   _sortedThreads: CommentThread[] = [];
 
+  @property({type: Boolean})
+  showCommentContext = false;
+
   @property({
     computed:
       '_computeDisplayedThreads(_sortedThreads.*, unresolvedOnly, ' +
@@ -102,6 +108,9 @@
   @property({type: Boolean})
   _isNewChangeSummaryUiEnabled = false;
 
+  @property({type: Object, observer: '_commentTabStateChange'})
+  commentTabState?: CommentTabState;
+
   flagsService = appContext.flagsService;
 
   /** @override */
@@ -136,8 +145,12 @@
   _computeResolvedCommentsMessage(
     threads: CommentThread[],
     displayedThreads: CommentThread[],
-    unresolvedOnly: boolean
+    unresolvedOnly: boolean,
+    onlyShowRobotCommentsWithHumanReply: boolean
   ) {
+    if (onlyShowRobotCommentsWithHumanReply) {
+      threads = this.filterRobotThreadsWithoutHumanReply(threads) ?? [];
+    }
     if (unresolvedOnly && threads.length && !displayedThreads.length) {
       return `Show ${pluralize(threads.length, 'resolved comment')}`;
     }
@@ -401,15 +414,9 @@
     const lastComment = comments.length
       ? comments[comments.length - 1]
       : undefined;
-    let hasRobotComment = false;
-    let hasHumanReplyToRobotComment = false;
-    comments.forEach(comment => {
-      if ((comment as UIRobot).robot_id) {
-        hasRobotComment = true;
-      } else if (hasRobotComment) {
-        hasHumanReplyToRobotComment = true;
-      }
-    });
+    const hasRobotComment = isRobotThread(thread);
+    const hasHumanReplyToRobotComment =
+      hasRobotComment && hasHumanReply(thread);
     let updated = undefined;
     if (lastComment) {
       if (isDraft(lastComment)) updated = lastComment.__date;
@@ -472,15 +479,21 @@
   }
 
   _countUnresolved(threads?: CommentThread[]) {
-    return threads?.filter(isUnresolved).length ?? 0;
+    return (
+      this.filterRobotThreadsWithoutHumanReply(threads)?.filter(isUnresolved)
+        .length ?? 0
+    );
   }
 
   _countAllThreads(threads?: CommentThread[]) {
-    return threads?.length ?? 0;
+    return this.filterRobotThreadsWithoutHumanReply(threads)?.length ?? 0;
   }
 
   _countDrafts(threads?: CommentThread[]) {
-    return threads?.filter(isDraftThread).length ?? 0;
+    return (
+      this.filterRobotThreadsWithoutHumanReply(threads)?.filter(isDraftThread)
+        .length ?? 0
+    );
   }
 
   /**
@@ -489,6 +502,30 @@
   _onTapUnresolvedToggle(e: Event) {
     e.preventDefault();
   }
+
+  filterRobotThreadsWithoutHumanReply(threads?: CommentThread[]) {
+    return threads?.filter(t => !isRobotThread(t) || hasHumanReply(t));
+  }
+
+  _commentTabStateChange(
+    newValue?: CommentTabState,
+    oldValue?: CommentTabState
+  ) {
+    if (!newValue || newValue === oldValue) return;
+    switch (newValue) {
+      case CommentTabState.UNRESOLVED:
+        this._handleOnlyUnresolved();
+        break;
+      case CommentTabState.DRAFTS:
+        this._handleOnlyDrafts();
+        break;
+      case CommentTabState.SHOW_ALL:
+        this._handleAllComments();
+        break;
+      default:
+        assertNever(newValue, 'Unsupported preferred state');
+    }
+  }
 }
 
 declare global {
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
index 28e8da8..8b1ba25 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
@@ -25,7 +25,6 @@
     gr-comment-thread {
       display: block;
       margin-bottom: var(--spacing-m);
-      max-width: 80ch;
     }
     .header {
       align-items: center;
@@ -102,7 +101,7 @@
             name="filterComments"
             type="radio"
             on-click="_handleOnlyUnresolved"
-            checked$="[[unresolvedOnly]]"
+            checked="[[unresolvedOnly]]"
           />
           <label for="unresolvedRadio">
             Unresolved ([[_countUnresolved(threads)]])
@@ -113,7 +112,7 @@
             name="filterComments"
             type="radio"
             on-click="_handleOnlyDrafts"
-            checked$="[[_draftsOnly]]"
+            checked="[[_draftsOnly]]"
           />
           <label for="draftsRadio">
             Drafts ([[_countDrafts(threads)]])
@@ -124,7 +123,7 @@
             name="filterComments"
             type="radio"
             on-click="_handleAllComments"
-            checked$="[[_showAllComments(_draftsOnly, unresolvedOnly)]]"
+            checked="[[_showAllComments(_draftsOnly, unresolvedOnly)]]"
           />
           <label for="all">
             All ([[_countAllThreads(threads)]])
@@ -150,7 +149,7 @@
               link
               on-click="_handleResolvedCommentsMessageClick">
                 [[_computeResolvedCommentsMessage(threads, _displayedThreads,
-                unresolvedOnly)]]
+                unresolvedOnly, onlyShowRobotCommentsWithHumanReply)]]
             </gr-button>
           </template>
         </span>
@@ -172,6 +171,7 @@
       <gr-comment-thread
         show-file-path=""
         show-ported-comment="[[thread.ported]]"
+        show-comment-context="[[showCommentContext]]"
         change-num="[[changeNum]]"
         comments="[[thread.comments]]"
         diff-side="[[thread.diffSide]]"
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-results.ts b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
index 68ff67b..df881f3 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-results.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
@@ -21,8 +21,10 @@
 import {sharedStyles} from '../../styles/shared-styles';
 import {RunResult} from '../../services/checks/checks-model';
 import {
+  hasCompleted,
   hasCompletedWithoutResults,
   iconForCategory,
+  isRunning,
 } from '../../services/checks/checks-util';
 
 @customElement('gr-result-row')
@@ -86,9 +88,9 @@
           flex-shrink: 1;
           overflow: hidden;
           text-overflow: ellipsis;
+          margin-right: var(--spacing-s);
         }
         td .summary-cell .message {
-          margin-left: var(--spacing-s);
           flex-grow: 1;
           /* Looks a bit stupid, but the idea is that .message shrinks first,
              and only when that has shrunken to 0, then .summary should also
@@ -119,7 +121,7 @@
 
   update(changedProperties: PropertyValues) {
     if (changedProperties.has('result')) {
-      this.isExpandable = !!this.result?.message;
+      this.isExpandable = !!this.result?.summary && !!this.result?.message;
     }
     super.update(changedProperties);
   }
@@ -137,9 +139,7 @@
         <td class="summaryCol">
           <div class="summary-cell">
             ${(this.result.links ?? []).map(this.renderLink)}
-            <!-- The &nbsp; is for being able to shrink a tiny amount without
-                 the text itself getting shrunk with an ellipsis. -->
-            <div class="summary">${this.result.summary}&nbsp;</div>
+            ${this.renderSummary(this.result.summary)}
             <div class="message">
               ${this.isExpanded ? '' : this.result.message}
             </div>
@@ -163,7 +163,6 @@
             aria-label="${this.isExpanded
               ? 'Collapse result row'
               : 'Expand result row'}"
-            @click="${this.toggleExpanded}"
             @keydown="${this.toggleExpanded}"
           >
             <iron-icon
@@ -182,6 +181,15 @@
     this.isExpanded = !this.isExpanded;
   }
 
+  renderSummary(text?: string) {
+    if (!text) return;
+    return html`
+      <!-- The &nbsp; is for being able to shrink a tiny amount without
+       the text itself getting shrunk with an ellipsis. -->
+      <div class="summary">${text}&nbsp;</div>
+    `;
+  }
+
   renderLink(link: Link) {
     return html`
       <a href="${link.url}" target="_blank">
@@ -250,7 +258,7 @@
           padding: var(--spacing-xl);
         }
         .categoryHeader {
-          margin-top: var(--spacing-xxl);
+          margin-top: var(--spacing-l);
           margin-left: var(--spacing-l);
           text-transform: capitalize;
         }
@@ -270,6 +278,9 @@
         .categoryHeader iron-icon.success {
           color: var(--success-foreground);
         }
+        .noCompleted {
+          margin-top: var(--spacing-l);
+        }
         table.resultsTable {
           width: 100%;
           max-width: 1280px;
@@ -289,12 +300,21 @@
   render() {
     return html`
       <div><h2 class="heading-2">Results</h2></div>
-      ${this.renderSection(Category.ERROR)}
+      ${this.renderNoCompleted()} ${this.renderSection(Category.ERROR)}
       ${this.renderSection(Category.WARNING)}
       ${this.renderSection(Category.INFO)} ${this.renderSuccess()}
     `;
   }
 
+  renderNoCompleted() {
+    if (this.runs.some(hasCompleted)) return;
+    let text = 'No results';
+    if (this.runs.some(isRunning)) {
+      text = 'Checks are running ...';
+    }
+    return html`<div class="noCompleted">${text}</div>`;
+  }
+
   renderSection(category: Category) {
     const catString = category.toString().toLowerCase();
     const runs = this.runs.filter(r =>
@@ -360,7 +380,8 @@
   renderSuccessfulRun(run: CheckRun) {
     const adaptedRun: RunResult = {
       category: Category.INFO, // will not be used, but is required
-      summary: run.statusDescription ?? 'Completed without results.',
+      summary: run.statusDescription ?? '',
+      message: 'Completed without results.',
       ...run,
     };
     return html`<gr-result-row .result="${adaptedRun}"></gr-result-row>`;
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
index 09a2319..4a34700 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
@@ -104,7 +104,7 @@
           border-radius: var(--border-radius);
           padding: var(--spacing-s) var(--spacing-m);
           margin-top: var(--spacing-s);
-          cursor: default;
+          cursor: pointer;
         }
         .name {
           font-weight: var(--font-weight-bold);
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 092daa2..3f6148b 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
@@ -21,6 +21,7 @@
 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');
 
@@ -40,6 +41,8 @@
           .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_html.ts b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts
index e8a1512..cf7d3ae 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_html.ts
@@ -79,6 +79,7 @@
       flex-grow: 1;
       margin: 0 var(--spacing-m);
       max-width: 500px;
+      min-width: 150px;
     }
     gr-dropdown,
     .browse {
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 468c8ca..19f43c2 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
@@ -594,6 +594,8 @@
 export const _testOnly_findCommentById =
   ChangeComments.prototype.findCommentById;
 
+export const _testOnly_getCommentsForPath =
+  ChangeComments.prototype.getCommentsForPath;
 @customElement('gr-comment-api')
 export class GrCommentApi extends GestureEventListeners(
   LegacyElementMixin(PolymerElement)
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 035c1a3..5ac37dc 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
@@ -235,7 +235,11 @@
     return result;
   }
 
-  moveToNextCommentThread(): CursorMoveResult {
+  moveToNextCommentThread(): CursorMoveResult | undefined {
+    if (this.isAtEnd()) {
+      fireEvent(this, 'navigate-to-next-file-with-comments');
+      return;
+    }
     const result = this.$.cursorManager.next({
       filter: (row: HTMLElement) => this._rowHasThread(row),
     });
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
index ae1e438..47b4a1f 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
@@ -79,6 +79,7 @@
   fireEvent,
 } from '../../../utils/event-util';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader';
+import {assertIsDefined} from '../../../utils/common-util';
 
 const MSG_EMPTY_BLAME = 'No blame information for this diff.';
 
@@ -324,8 +325,8 @@
     return getPluginLoader()
       .awaitPluginsLoaded()
       .then(() => {
-        if (!this.path) throw new Error('Missing required "path" property.');
-        if (!this.changeNum) throw new Error('Missing required "changeNum".');
+        assertIsDefined(this.path, 'path');
+        assertIsDefined(this.changeNum, 'changeNum');
         this._layers = this._getLayers(this.path, this.changeNum);
         this._coverageRanges = [];
         // We kick off fetching the data here, but we don't return the promise,
@@ -341,8 +342,8 @@
    */
   async reload(shouldReportMetric?: boolean) {
     this.clear();
-    if (!this.path) throw new Error('Missing required "path" property.');
-    if (!this.changeNum) throw new Error('Missing required "changeNum" prop.');
+    assertIsDefined(this.path, 'path');
+    assertIsDefined(this.changeNum, 'changeNum');
     this.diff = undefined;
     this._errorMessage = null;
     const whitespaceLevel = this._getIgnoreWhitespace();
@@ -420,10 +421,10 @@
   }
 
   _getCoverageData() {
-    if (!this.changeNum) throw new Error('Missing required "changeNum" prop.');
-    if (!this.change) throw new Error('Missing required "change" prop.');
-    if (!this.path) throw new Error('Missing required "path" prop.');
-    if (!this.patchRange) throw new Error('Missing required "patchRange".');
+    assertIsDefined(this.changeNum, 'changeNum');
+    assertIsDefined(this.change, 'change');
+    assertIsDefined(this.path, 'path');
+    assertIsDefined(this.patchRange, 'patchRange');
     const changeNum = this.changeNum;
     const change = this.change;
     const path = this.path;
@@ -442,7 +443,7 @@
           if (!provider) return;
           provider(changeNum, path, basePatchNum, patchNum, change)
             .then(coverageRanges => {
-              if (!this.patchRange) throw new Error('Missing "patchRange".');
+              assertIsDefined(this.patchRange, 'patchRange');
               if (
                 !coverageRanges ||
                 changeNum !== this.changeNum ||
@@ -532,9 +533,9 @@
    * Load and display blame information for the base of the diff.
    */
   loadBlame(): Promise<BlameInfo[]> {
-    if (!this.changeNum) throw new Error('Missing required "changeNum" prop.');
-    if (!this.patchRange) throw new Error('Missing required "patchRange".');
-    if (!this.path) throw new Error('Missing required "path" property.');
+    assertIsDefined(this.changeNum, 'changeNum');
+    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.path, 'path');
     return this.restApiService
       .getBlame(this.changeNum, this.patchRange.patchNum, this.path, true)
       .then(blame => {
@@ -564,8 +565,8 @@
     this.$.diff.clearDiffContent();
   }
 
-  expandAllContext() {
-    this.$.diff.expandAllContext();
+  toggleAllContext() {
+    this.$.diff.toggleAllContext();
   }
 
   _getLoggedIn() {
@@ -599,9 +600,9 @@
     // Wrap the diff request in a new promise so that the error handler
     // rejects the promise, allowing the error to be handled in the .catch.
     return new Promise((resolve, reject) => {
-      if (!this.changeNum) throw new Error('Missing required "changeNum".');
-      if (!this.patchRange) throw new Error('Missing required "patchRange".');
-      if (!this.path) throw new Error('Missing required "path" property.');
+      assertIsDefined(this.changeNum, 'changeNum');
+      assertIsDefined(this.patchRange, 'patchRange');
+      assertIsDefined(this.path, 'path');
       this.restApiService
         .getDiff(
           this.changeNum,
@@ -669,7 +670,7 @@
 
     // Report the due_to_rebase percentage in the "diff" category when
     // applicable.
-    if (!this.patchRange) throw new Error('Missing required "patchRange".');
+    assertIsDefined(this.patchRange, 'patchRange');
     if (this.patchRange.basePatchNum === 'PARENT') {
       this.reporting.reportInteraction(EVENT_AGAINST_PARENT);
     } else if (percentRebaseDelta === 0) {
@@ -726,8 +727,8 @@
   }
 
   _getImages(diff: DiffInfo) {
-    if (!this.changeNum) throw new Error('Missing required "changeNum" prop.');
-    if (!this.patchRange) throw new Error('Missing required "patchRange".');
+    assertIsDefined(this.changeNum, 'changeNum');
+    assertIsDefined(this.patchRange, 'patchRange');
     return this.restApiService.getImagesForDiff(
       this.changeNum,
       diff,
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
index 99486ad..01c78f0 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
@@ -796,9 +796,9 @@
     assert.equal(stub.lastCall.args.length, 0);
   });
 
-  test('delegates expandAllContext()', () => {
-    const stub = sinon.stub(element.$.diff, 'expandAllContext');
-    element.expandAllContext();
+  test('delegates toggleAllContext()', () => {
+    const stub = sinon.stub(element.$.diff, 'toggleAllContext');
+    element.toggleAllContext();
     assert.isTrue(stub.calledOnce);
     assert.equal(stub.lastCall.args.length, 0);
   });
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 62b34e9..088d9cf 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
@@ -97,6 +97,7 @@
 import {CustomKeyboardEvent, OpenFixPreviewEvent} from '../../../types/events';
 import {fireAlert, fireTitleChange} from '../../../utils/event-util';
 import {GerritView} from '../../../services/router/router-model';
+import {assertIsDefined} from '../../../utils/common-util';
 const ERR_REVIEW_STATUS = 'Couldn’t change file review status.';
 const MSG_LOADING_BLAME = 'Loading blame...';
 const MSG_LOADED_BLAME = 'Blame loaded';
@@ -291,7 +292,7 @@
       [Shortcut.OPEN_DIFF_PREFS]: '_handleCommaKey',
       [Shortcut.TOGGLE_DIFF_MODE]: '_handleToggleDiffMode',
       [Shortcut.TOGGLE_FILE_REVIEWED]: '_throttledToggleFileReviewed',
-      [Shortcut.EXPAND_ALL_DIFF_CONTEXT]: '_handleExpandAllDiffContext',
+      [Shortcut.TOGGLE_ALL_DIFF_CONTEXT]: '_handleToggleAllDiffContext',
       [Shortcut.NEXT_UNREVIEWED_FILE]: '_handleNextUnreviewedFile',
       [Shortcut.TOGGLE_BLAME]: '_handleToggleBlame',
       [Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS]:
@@ -370,7 +371,7 @@
   }
 
   _getChangeEdit() {
-    if (!this._changeNum) throw new Error('Missing this._changeNum');
+    assertIsDefined(this._changeNum, '_changeNum');
     return this.restApiService.getChangeEdit(this._changeNum);
   }
 
@@ -711,7 +712,12 @@
     );
   }
 
-  _navToFile(path: string, fileList: string[], direction: -1 | 1) {
+  _navToFile(
+    path: string,
+    fileList: string[],
+    direction: -1 | 1,
+    navigateToFirstComment?: boolean
+  ) {
     const newPath = this._getNavLinkPath(path, fileList, direction);
     if (!newPath) return;
     if (!this._change) return;
@@ -727,11 +733,18 @@
     }
 
     if (!newPath.path) return;
+    let lineNum;
+    if (navigateToFirstComment)
+      lineNum = this._changeComments?.getCommentsForPath(
+        newPath.path,
+        this._patchRange
+      )?.[0].line;
     GerritNav.navigateToDiff(
       this._change,
       newPath.path,
       this._patchRange.patchNum,
-      this._patchRange.basePatchNum
+      this._patchRange.basePatchNum,
+      lineNum
     );
   }
 
@@ -968,7 +981,7 @@
         leftSide = !!this.params.leftSide;
       }
     }
-    if (!this._patchRange) throw new Error('Failed to initialize patchRange.');
+    assertIsDefined(this._patchRange, '_patchRange');
     this._initLineOfInterestAndCursor(leftSide);
 
     if (this.params?.commentId) {
@@ -1040,10 +1053,10 @@
         this._initPatchRange();
         this._initCommitRange();
 
-        if (!this._path) throw new Error('path must be defined');
+        assertIsDefined(this._path, '_path');
         if (!this._changeComments)
           throw new Error('change comments must be defined');
-        if (!this._patchRange) throw new Error('patch range must be defined');
+        assertIsDefined(this._patchRange, '_patchRange');
 
         // TODO(dhruvsri): check if basePath should be set here
         this.$.diffHost.threads = this._changeComments.getThreadsBySideForFile(
@@ -1070,9 +1083,9 @@
         if (!this._diff) throw new Error('Missing this._diff');
         const fileUnchanged = this._isFileUnchanged(this._diff);
         if (fileUnchanged && value.commentLink) {
-          if (!this._change) throw new Error('Missing this._change');
-          if (!this._path) throw new Error('Missing this._path');
-          if (!this._patchRange) throw new Error('Missing this._patchRange');
+          assertIsDefined(this._change, '_change');
+          assertIsDefined(this._path, '_path');
+          assertIsDefined(this._patchRange, '_patchRange');
 
           if (this._patchRange.basePatchNum === ParentPatchSetNum) {
             // file is unchanged between Base vs X
@@ -1481,7 +1494,7 @@
   }
 
   _loadComments(patchSet?: PatchSetNum) {
-    if (!this._changeNum) throw new Error('Missing this._changeNum');
+    assertIsDefined(this._changeNum, '_changeNum');
     return this.$.commentAPI
       .loadAll(this._changeNum, patchSet)
       .then(comments => {
@@ -1517,7 +1530,7 @@
   }
 
   _getDiffDrafts() {
-    if (!this._changeNum) throw new Error('Missing this._changeNum');
+    assertIsDefined(this._changeNum, '_changeNum');
 
     return this.restApiService.getDiffDrafts(this._changeNum);
   }
@@ -1732,10 +1745,10 @@
     return '';
   }
 
-  _handleExpandAllDiffContext(e: CustomKeyboardEvent) {
+  _handleToggleAllDiffContext(e: CustomKeyboardEvent) {
     if (this.shouldSuppressKeyboardShortcut(e)) return;
 
-    this.$.diffHost.expandAllContext();
+    this.$.diffHost.toggleAllContext();
   }
 
   _computeDiffPrefsDisabled(disableDiffPrefs?: boolean, loggedIn?: boolean) {
@@ -1757,6 +1770,23 @@
     this._navToFile(this._path, unreviewedFiles, 1);
   }
 
+  _navigateToNextFileWithCommentThread() {
+    if (!this._path) return;
+    if (!this._fileList) return;
+    if (!this._patchRange) return;
+    if (!this._change) return;
+    const hasComment = (path: string) => {
+      return (
+        this._changeComments?.getCommentsForPath(path, this._patchRange!)
+          ?.length ?? 0 > 0
+      );
+    };
+    const filesWithComments = this._fileList.filter(
+      file => file === this._path || hasComment(file)
+    );
+    this._navToFile(this._path, filesWithComments, 1, true);
+  }
+
   _handleReloadingDiffPreference() {
     this._getDiffPreferences();
   }
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
index a00927c..bfb0cd8 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
@@ -428,6 +428,7 @@
   <gr-diff-cursor
     id="cursor"
     on-navigate-to-next-unreviewed-file="_handleNextUnreviewedFile"
+    on-navigate-to-next-file-with-comments="_navigateToNextFileWithCommentThread"
   ></gr-diff-cursor>
   <gr-comment-api id="commentAPI"></gr-comment-api>
 `;
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
index 34e74b6..b5473a3 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.js
@@ -21,7 +21,7 @@
 import {ChangeStatus} from '../../../constants/constants.js';
 import {TestKeyboardShortcutBinder} from '../../../test/test-utils.js';
 import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
-import {_testOnly_findCommentById} from '../gr-comment-api/gr-comment-api.js';
+import {ChangeComments, _testOnly_findCommentById, _testOnly_getCommentsForPath} from '../gr-comment-api/gr-comment-api.js';
 import {GerritView} from '../../../services/router/router-model.js';
 import {
   createChange,
@@ -63,7 +63,7 @@
       kb.bindShortcut(Shortcut.OPEN_DIFF_PREFS, ',');
       kb.bindShortcut(Shortcut.TOGGLE_DIFF_MODE, 'm');
       kb.bindShortcut(Shortcut.TOGGLE_FILE_REVIEWED, 'r');
-      kb.bindShortcut(Shortcut.EXPAND_ALL_DIFF_CONTEXT, 'shift+x');
+      kb.bindShortcut(Shortcut.TOGGLE_ALL_DIFF_CONTEXT, 'shift+x');
       kb.bindShortcut(Shortcut.EXPAND_ALL_COMMENT_THREADS, 'e');
       kb.bindShortcut(Shortcut.TOGGLE_HIDE_ALL_COMMENT_THREADS, 'h');
       kb.bindShortcut(Shortcut.COLLAPSE_ALL_COMMENT_THREADS, 'shift+e');
@@ -137,6 +137,7 @@
         computeUnresolvedNum: () => {},
         getPaths: () => {},
         getThreadsBySideForFile: () => [],
+        getCommentsForPath: _testOnly_getCommentsForPath,
         findCommentById: _testOnly_findCommentById,
 
       }));
@@ -465,11 +466,53 @@
       assert.equal(element._setReviewed.lastCall.args[0], true);
     });
 
-    test('shift+x shortcut expands all diff context', () => {
-      const expandStub = sinon.stub(element.$.diffHost, 'expandAllContext');
+    test('moveToNextCommentThread navigates to next file', () => {
+      const diffNavStub = sinon.stub(GerritNav, 'navigateToDiff');
+      const diffChangeStub = sinon.stub(element, '_navigateToChange');
+      sinon.stub(element.$.cursor, 'isAtEnd').returns(true);
+      element._changeNum = '42';
+      const comment = {
+        'wheatley.md': [{
+          ...createComment(),
+          patch_set: 10,
+          line: 21,
+        }],
+      };
+      element._changeComments = new ChangeComments(comment);
+      element._patchRange = {
+        basePatchNum: PARENT,
+        patchNum: 10,
+      };
+      element._change = {
+        _number: 42,
+        revisions: {
+          a: {_number: 10, commit: {parents: []}},
+        },
+      };
+      element._files = getFilesFromFileList(
+          ['chell.go', 'glados.txt', 'wheatley.md']);
+      element._path = 'glados.txt';
+      element.changeViewState.selectedFileIndex = 1;
+      element._loggedIn = true;
+
+      MockInteractions.pressAndReleaseKeyOn(element, 78, 'shift', 'n');
+      flush();
+      assert.isTrue(diffNavStub.calledWithExactly(
+          element._change, 'wheatley.md', 10, PARENT, 21));
+
+      element._path = 'wheatley.md'; // navigated to next file
+
+      MockInteractions.pressAndReleaseKeyOn(element, 78, 'shift', 'n');
+      flush();
+
+      assert.isTrue(diffChangeStub.called);
+    });
+
+    test('shift+x shortcut toggles all diff context', () => {
+      const toggleStub = sinon.stub(element.$.diffHost, 'toggleAllContext');
       MockInteractions.pressAndReleaseKeyOn(element, 88, 'shift', 'x');
       flush();
-      assert.isTrue(expandStub.called);
+      assert.isTrue(toggleStub.called);
     });
 
     test('diff against base', () => {
@@ -621,14 +664,14 @@
       MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
       assert.isTrue(element._loading);
       assert(diffNavStub.lastCall.calledWithExactly(element._change,
-          'wheatley.md', 10, 5),
+          'wheatley.md', 10, 5, undefined),
       'Should navigate to /c/42/5..10/wheatley.md');
       element._path = 'wheatley.md';
 
       MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
       assert.isTrue(element._loading);
       assert(diffNavStub.lastCall.calledWithExactly(element._change,
-          'glados.txt', 10, 5),
+          'glados.txt', 10, 5, undefined),
       'Should navigate to /c/42/5..10/glados.txt');
       element._path = 'glados.txt';
 
@@ -638,7 +681,8 @@
           element._change,
           'chell.go',
           10,
-          5),
+          5,
+          undefined),
       'Should navigate to /c/42/5..10/chell.go');
       element._path = 'chell.go';
 
@@ -692,13 +736,13 @@
 
       MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
       assert(diffNavStub.lastCall.calledWithExactly(element._change,
-          'wheatley.md', 1, PARENT),
+          'wheatley.md', 1, PARENT, undefined),
       'Should navigate to /c/42/1/wheatley.md');
       element._path = 'wheatley.md';
 
       MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
       assert(diffNavStub.lastCall.calledWithExactly(element._change,
-          'glados.txt', 1, PARENT),
+          'glados.txt', 1, PARENT, undefined),
       'Should navigate to /c/42/1/glados.txt');
       element._path = 'glados.txt';
 
@@ -707,7 +751,8 @@
           element._change,
           'chell.go',
           1,
-          PARENT), 'Should navigate to /c/42/1/chell.go');
+          PARENT,
+          undefined), 'Should navigate to /c/42/1/chell.go');
       element._path = 'chell.go';
 
       changeNavStub.reset();
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts
index 7946061..6974a76 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts
@@ -55,7 +55,11 @@
   PolymerDomWrapper,
 } from '../../../types/types';
 import {CommentRangeLayer} from '../gr-ranged-comment-layer/gr-ranged-comment-layer';
-import {DiffViewMode, Side} from '../../../constants/constants';
+import {
+  createDefaultDiffPrefs,
+  DiffViewMode,
+  Side,
+} from '../../../constants/constants';
 import {KeyLocations} from '../gr-diff-processor/gr-diff-processor';
 import {FlattenedNodesObserver} from '@polymer/polymer/lib/utils/flattened-nodes-observer';
 import {PolymerDeepPropertyChange} from '@polymer/polymer/interfaces';
@@ -66,15 +70,18 @@
 // @ts-ignore
 import * as shadow from 'shadow-selection-polyfill/shadow.js';
 
-import {CreateCommentEventDetail as CreateCommentEventDetailApi} from '../../../api/diff';
+import {
+  CreateCommentEventDetail as CreateCommentEventDetailApi,
+  RenderPreferences,
+} from '../../../api/diff';
 import {isSafari} from '../../../utils/dom-util';
+import {assertIsDefined} from '../../../utils/common-util';
 
 const NO_NEWLINE_BASE = 'No newline at end of base file.';
 const NO_NEWLINE_REVISION = 'No newline at end of revision file.';
 
 const LARGE_DIFF_THRESHOLD_LINES = 10000;
 const FULL_CONTEXT = -1;
-const LIMITED_CONTEXT = 10;
 
 const COMMIT_MSG_PATH = '/COMMIT_MSG';
 /**
@@ -158,6 +165,9 @@
   @property({type: Object, observer: '_prefsObserver'})
   prefs?: DiffPreferencesInfo;
 
+  @property({type: Object, observer: '_renderPrefsChanged'})
+  renderPrefs?: RenderPreferences;
+
   @property({type: Boolean})
   displayLine = false;
 
@@ -173,6 +183,10 @@
   @property({type: Array})
   _commentRanges: CommentRangeLayer[] = [];
 
+  // explicitly highlight a range if it is not associated with any comment
+  @property({type: Object})
+  highlightRange?: CommentRange;
+
   @property({type: Array})
   coverageRanges: CoverageRange[] = [];
 
@@ -413,6 +427,14 @@
     if (addedCommentRanges && addedCommentRanges.length) {
       this.push('_commentRanges', ...addedCommentRanges);
     }
+    if (this.highlightRange) {
+      this.push('_commentRanges', {
+        side: Side.RIGHT,
+        range: this.highlightRange,
+        hovering: true,
+        rootId: '',
+      });
+    }
   }
 
   /**
@@ -608,7 +630,7 @@
     const contentEl = this.$.diffBuilder.getContentTdByLineEl(lineEl);
     if (!contentEl) throw new Error('content el not found for line el');
     side = side ?? this._getCommentSideByLineAndContent(lineEl, contentEl);
-    if (!this.path) throw new Error('must have a path to create comments');
+    assertIsDefined(this.path, 'path');
     this.dispatchEvent(
       new CustomEvent<CreateCommentEventDetail>('create-comment', {
         bubbles: true,
@@ -727,6 +749,16 @@
     }
   }
 
+  _renderPrefsChanged(renderPrefs?: RenderPreferences) {
+    if (!renderPrefs) return;
+    if (renderPrefs.hide_left_side) {
+      this.classList.add('no-left');
+    }
+    if (renderPrefs.disable_context_control_buttons) {
+      this.updateStyles({'--context-control-display': 'none'});
+    }
+  }
+
   _diffChanged(newValue?: DiffInfo) {
     this._setLoading(true);
     this._cleanup();
@@ -940,8 +972,12 @@
     this._debounceRenderDiffTable();
   }
 
-  _handleLimitedBypass() {
-    this._safetyBypass = LIMITED_CONTEXT;
+  _collapseContext() {
+    // Uses the default context amount if the preference is for the entire file.
+    this._safetyBypass =
+      this.prefs?.context && this.prefs.context >= 0
+        ? null
+        : createDefaultDiffPrefs().context;
     this._debounceRenderDiffTable();
   }
 
@@ -953,8 +989,15 @@
     return errorMessage ? 'showError' : '';
   }
 
-  expandAllContext() {
-    this._handleFullBypass();
+  toggleAllContext() {
+    if (!this.prefs) {
+      return;
+    }
+    if (this._getBypassPrefs(this.prefs).context < 0) {
+      this._collapseContext();
+    } else {
+      this._handleFullBypass();
+    }
   }
 
   _computeNewlineWarning(warnLeft: boolean, warnRight: boolean) {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts
index b0f48ce..4d0e566 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff_html.ts
@@ -272,6 +272,7 @@
 
     /* Context controls */
     .contextControl {
+      display: var(--context-control-display, table-row-group);
       background-color: transparent;
       border: none;
       --divider-height: var(--spacing-s);
@@ -622,7 +623,7 @@
       Prevented render because "Whole file" is enabled and this diff is very
       large (about [[_diffLength]] lines).
     </p>
-    <gr-button on-click="_handleLimitedBypass">
+    <gr-button on-click="_collapseContext">
       Render with limited context
     </gr-button>
     <gr-button on-click="_handleFullBypass">
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 ec44f92..6fef223 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
@@ -161,12 +161,10 @@
         element.patchRange = {basePatchNum: 'PARENT', patchNum: 1};
         element.isImageDiff = true;
         element.prefs = {
-          auto_hide_diff_table_header: true,
           context: 10,
           cursor_blink_rate: 0,
           font_size: 12,
           ignore_whitespace: 'IGNORE_NONE',
-          intraline_difference: true,
           line_length: 100,
           line_wrapping: false,
           show_line_endings: true,
@@ -497,12 +495,11 @@
           line_length: 100,
           cursor_blink_rate: 0,
           line_wrapping: false,
-          intraline_difference: true,
+
           show_line_endings: true,
           show_tabs: true,
           show_whitespace_errors: true,
           syntax_highlighting: true,
-          auto_hide_diff_table_header: true,
           theme: 'DEFAULT',
           ignore_whitespace: 'IGNORE_NONE',
         };
@@ -797,6 +794,43 @@
       element.addEventListener('render', rendered);
       element._renderDiffTable();
     });
+
+    test('toggles expand context using bypass', async () => {
+      element.prefs = {...MINIMAL_PREFS, context: 3};
+
+      element.toggleAllContext();
+      element._renderDiffTable();
+      await flush();
+
+      assert.equal(element.prefs.context, 3);
+      assert.equal(element._safetyBypass, -1);
+      assert.equal(renderStub.firstCall.lastArg.context, -1);
+    });
+
+    test('toggles collapse context from bypass', async () => {
+      element.prefs = {...MINIMAL_PREFS, context: 3};
+      element._safetyBypass = -1;
+
+      element.toggleAllContext();
+      element._renderDiffTable();
+      await flush();
+
+      assert.equal(element.prefs.context, 3);
+      assert.isNull(element._safetyBypass);
+      assert.equal(renderStub.firstCall.lastArg.context, 3);
+    });
+
+    test('toggles collapse context from pref using default', async () => {
+      element.prefs = {...MINIMAL_PREFS, context: -1};
+
+      element.toggleAllContext();
+      element._renderDiffTable();
+      await flush();
+
+      assert.equal(element.prefs.context, -1);
+      assert.equal(element._safetyBypass, 10);
+      assert.equal(renderStub.firstCall.lastArg.context, 10);
+    });
   });
 
   suite('blame', () => {
@@ -959,11 +993,10 @@
     element = basicFixture.instantiate();
     element.prefs = {
       ignore_whitespace: ignore_whitespace || 'IGNORE_ALL',
-      auto_hide_diff_table_header: true,
       context: 10,
       cursor_blink_rate: 0,
       font_size: 12,
-      intraline_difference: true,
+
       line_length: 100,
       line_wrapping: false,
       show_line_endings: true,
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 ee52ab6..f38824f 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
@@ -23,6 +23,7 @@
 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 {
@@ -56,6 +57,11 @@
   @property({type: Boolean})
   positionBelow = false;
 
+  @property({type: Boolean})
+  disableKeyboardShortcuts = false;
+
+  private restApiService = appContext.restApiService;
+
   /** @override */
   created() {
     super.created();
@@ -64,6 +70,18 @@
     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 24d63b3..d293967 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="Press c to comment"
+    text="[[_getTextForTooltip(disableKeyboardShortcuts)]]"
     position-below="[[positionBelow]]"
   ></gr-tooltip>
 `;
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 e9637af..1864598 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
@@ -32,7 +32,6 @@
 } from '../../core/gr-navigation/gr-navigation';
 import {computeTruncatedPath} from '../../../utils/path-list-util';
 import {customElement, property} from '@polymer/decorators';
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {
   ChangeInfo,
   PatchSetNum,
@@ -45,6 +44,8 @@
 import {HttpMethod, NotifyType} from '../../../constants/constants';
 import {fireAlert, fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback} from '../../../api/rest';
+import {assertIsDefined} from '../../../utils/common-util';
 
 const RESTORED_MESSAGE = 'Content restored from a previous edit.';
 const SAVING_MESSAGE = 'Saving changes...';
@@ -326,7 +327,7 @@
   }
 
   _handlePublishTap() {
-    if (!this._changeNum) throw new Error('missing changeNum');
+    assertIsDefined(this._changeNum, '_changeNum');
 
     const changeNum = this._changeNum;
     this._saveEdit().then(() => {
@@ -347,7 +348,7 @@
           handleError
         )
         .then(() => {
-          if (!this._change) throw new Error('missing change');
+          assertIsDefined(this._change, '_change');
           GerritNav.navigateToChange(this._change);
         });
     });
diff --git a/polygerrit-ui/app/elements/gr-app-element.ts b/polygerrit-ui/app/elements/gr-app-element.ts
index cdc9f98..e4d72e1 100644
--- a/polygerrit-ui/app/elements/gr-app-element.ts
+++ b/polygerrit-ui/app/elements/gr-app-element.ts
@@ -392,7 +392,7 @@
     }
     this.bindShortcut(Shortcut.NEXT_CHUNK, 'n');
     this.bindShortcut(Shortcut.PREV_CHUNK, 'p');
-    this.bindShortcut(Shortcut.EXPAND_ALL_DIFF_CONTEXT, 'shift+x');
+    this.bindShortcut(Shortcut.TOGGLE_ALL_DIFF_CONTEXT, 'shift+x');
     this.bindShortcut(Shortcut.NEXT_COMMENT_THREAD, 'shift+n');
     this.bindShortcut(Shortcut.PREV_COMMENT_THREAD, 'shift+p');
     this.bindShortcut(
diff --git a/polygerrit-ui/app/elements/plugins/gr-admin-api/gr-admin-api.ts b/polygerrit-ui/app/elements/plugins/gr-admin-api/gr-admin-api.ts
index 1332118..897be67 100644
--- a/polygerrit-ui/app/elements/plugins/gr-admin-api/gr-admin-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-admin-api/gr-admin-api.ts
@@ -14,27 +14,20 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
-import {PluginApi} from '../gr-plugin-types';
-
-/** Interface for menu link */
-export interface MenuLink {
-  text: string;
-  url: string;
-  capability: string | null;
-}
+import {EventType, PluginApi} from '../../../api/plugin';
+import {AdminPluginApi, MenuLink} from '../../../api/admin';
 
 /**
  * GrAdminApi class.
  *
  * Defines common methods to register / retrieve menu links.
  */
-export class GrAdminApi {
+export class GrAdminApi implements AdminPluginApi {
   // TODO(TS): maybe define as enum if its a limited set
   private menuLinks: MenuLink[] = [];
 
   constructor(private readonly plugin: PluginApi) {
-    this.plugin.on('admin-menu-links', this);
+    this.plugin.on(EventType.ADMIN_MENU_LINKS, this);
   }
 
   addMenuLink(text: string, url: string, capability?: string) {
diff --git a/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper.ts b/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper.ts
index 0641b49..e0b4ee9 100644
--- a/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-attribute-helper/gr-attribute-helper.ts
@@ -14,8 +14,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import {AttributeHelperPluginApi} from '../../../api/attribute-helper';
 
-export class GrAttributeHelper {
+export class GrAttributeHelper implements AttributeHelperPluginApi {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   private readonly _promises = new Map<string, Promise<any>>();
 
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 322d32e..3a61bce 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
@@ -14,9 +14,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {HookApi, PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {ChangeMetadataPluginApi} from '../../../api/change-metadata';
+import {HookApi} from '../../../api/hook';
 
-export class GrChangeMetadataApi {
+export class GrChangeMetadataApi implements ChangeMetadataPluginApi {
   private _hook: HookApi | null;
 
   public plugin: PluginApi;
diff --git a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts
index 82c1087..404fc71 100644
--- a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts
@@ -14,11 +14,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
 import {
   ChecksApiConfig,
   ChecksProvider,
-  GrChecksApiInterface,
+  ChecksPluginApi,
 } from '../../../api/checks';
 import {appContext} from '../../../services/app-context';
 
@@ -38,7 +38,7 @@
  * Plugins normally just call register() once at startup and then wait for
  * fetch() being called on the provider interface.
  */
-export class GrChecksApi implements GrChecksApiInterface {
+export class GrChecksApi implements ChecksPluginApi {
   private state = State.NOT_REGISTERED;
 
   private readonly checksService = appContext.checksService;
diff --git a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api_test.ts b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api_test.ts
index 45cbb47..3ab3efb 100644
--- a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api_test.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api_test.ts
@@ -18,13 +18,13 @@
 import '../../../test/common-test-setup-karma.js';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader.js';
 import {_testOnly_initGerritPluginApi} from '../../shared/gr-js-api-interface/gr-gerrit.js';
-import {GrChecksApi} from './gr-checks-api';
-import {PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {ChecksPluginApi} from '../../../api/checks';
 
 const gerritPluginApi = _testOnly_initGerritPluginApi();
 
 suite('gr-settings-api tests', () => {
-  let checksApi: GrChecksApi | undefined;
+  let checksApi: ChecksPluginApi | undefined;
 
   setup(() => {
     let pluginApi: PluginApi | undefined = undefined;
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 dd76be4..d2568ad 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
@@ -15,7 +15,8 @@
  * limitations under the License.
  */
 import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {HookApi, HookCallback, PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {HookApi, HookCallback} from '../../../api/hook';
 
 export class GrDomHooksManager {
   private _hooks: Record<string, GrDomHook>;
diff --git a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.ts b/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.ts
index 12863fd..423cff9 100644
--- a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.ts
@@ -24,7 +24,8 @@
 } from '../../shared/gr-js-api-interface/gr-plugin-endpoints';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader';
 import {customElement, property} from '@polymer/decorators';
-import {HookApi, PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {HookApi} from '../../../api/hook';
 
 const INIT_PROPERTIES_TIMEOUT_MS = 10000;
 
diff --git a/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts b/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts
index 5a4d2ae..4b34d56 100644
--- a/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts
@@ -14,13 +14,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import {
+  EventHelperPluginApi,
+  UnsubscribeCallback,
+} from '../../../api/event-helper';
 
 export interface ListenOptions {
   event?: string;
   capture?: boolean;
 }
 
-export class GrEventHelper {
+export class GrEventHelper implements EventHelperPluginApi {
   constructor(readonly element: HTMLElement) {}
 
   /**
@@ -50,7 +54,7 @@
    * Alias for @see captureClick
    */
   captureTap(callback: (event: Event) => boolean) {
-    this.captureClick(callback);
+    return this.captureClick(callback);
   }
 
   /**
@@ -68,7 +72,7 @@
     container: HTMLElement,
     callback: (event: Event) => boolean,
     options?: ListenOptions | null
-  ) {
+  ): UnsubscribeCallback {
     const capture = options?.capture;
     const event = options?.event || 'click';
     const handler = (e: Event) => {
diff --git a/polygerrit-ui/app/elements/plugins/gr-plugin-types.ts b/polygerrit-ui/app/elements/plugins/gr-plugin-types.ts
deleted file mode 100644
index 2cd0f78..0000000
--- a/polygerrit-ui/app/elements/plugins/gr-plugin-types.ts
+++ /dev/null
@@ -1,105 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {GrAttributeHelper} from './gr-attribute-helper/gr-attribute-helper';
-import {GrPluginRestApi} from '../shared/gr-js-api-interface/gr-plugin-rest-api';
-import {GrEventHelper} from './gr-event-helper/gr-event-helper';
-import {GrPopupInterface} from './gr-popup-interface/gr-popup-interface';
-import {ConfigInfo} from '../../types/common';
-import {GrChecksApi} from './gr-checks-api/gr-checks-api';
-
-interface GerritElementExtensions {
-  content?: HTMLElement & {hidden?: boolean};
-  change?: unknown;
-  revision?: unknown;
-  token?: string;
-  repoName?: string;
-  config?: ConfigInfo;
-}
-export type HookCallback = (el: HTMLElement & GerritElementExtensions) => void;
-
-export interface HookApi {
-  onAttached(callback: HookCallback): HookApi;
-  onDetached(callback: HookCallback): HookApi;
-  getAllAttached(): HTMLElement[];
-  getLastAttached(): Promise<HTMLElement>;
-  getModuleName(): string;
-  handleInstanceDetached(instance: HTMLElement): void;
-  handleInstanceAttached(instance: HTMLElement): void;
-}
-
-export enum TargetElement {
-  CHANGE_ACTIONS = 'changeactions',
-  REPLY_DIALOG = 'replydialog',
-}
-
-// Note: for new events, naming convention should be: `a-b`
-export enum EventType {
-  HISTORY = 'history',
-  LABEL_CHANGE = 'labelchange',
-  SHOW_CHANGE = 'showchange',
-  SUBMIT_CHANGE = 'submitchange',
-  SHOW_REVISION_ACTIONS = 'show-revision-actions',
-  COMMIT_MSG_EDIT = 'commitmsgedit',
-  COMMENT = 'comment',
-  REVERT = 'revert',
-  REVERT_SUBMISSION = 'revert_submission',
-  POST_REVERT = 'postrevert',
-  ANNOTATE_DIFF = 'annotatediff',
-  ADMIN_MENU_LINKS = 'admin-menu-links',
-  HIGHLIGHTJS_LOADED = 'highlightjs-loaded',
-}
-
-export interface RegisterOptions {
-  slot?: string;
-  replace: unknown;
-}
-
-export interface PanelInfo {
-  body: Element;
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  p: {[key: string]: any};
-  onUnload: () => void;
-}
-
-export interface SettingsInfo {
-  body: Element;
-  token?: string;
-  onUnload: () => void;
-  setTitle: () => void;
-  setWindowTitle: () => void;
-  show: () => void;
-}
-
-export interface PluginApi {
-  _url?: URL;
-  popup(): Promise<GrPopupInterface>;
-  popup(moduleName: string): Promise<GrPopupInterface>;
-  popup(moduleName?: string): Promise<GrPopupInterface | null>;
-  hook(endpointName: string, opt_options?: RegisterOptions): HookApi;
-  getPluginName(): string;
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  on(eventName: string, target: any): void;
-  attributeHelper(element: Element): GrAttributeHelper;
-  checks(): GrChecksApi;
-  restApi(): GrPluginRestApi;
-  eventHelper(element: Node): GrEventHelper;
-  registerDynamicCustomComponent(
-    endpointName: string,
-    moduleName?: string,
-    options?: RegisterOptions
-  ): HookApi;
-}
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 d45c263..07d11ec 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
@@ -17,7 +17,8 @@
 import './gr-plugin-popup';
 import {dom, flush} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GrPluginPopup} from './gr-plugin-popup';
-import {PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {PopupPluginApi} from '../../../api/popup';
 
 interface CustomPolymerPluginEl extends HTMLElement {
   plugin: PluginApi;
@@ -29,7 +30,7 @@
  * opt_moduleName is a name of custom element that will be automatically
  * inserted on popup opening.
  */
-export class GrPopupInterface {
+export class GrPopupInterface implements PopupPluginApi {
   private _openingPromise: Promise<GrPopupInterface> | null = null;
 
   private _popup: GrPluginPopup | null = null;
@@ -50,7 +51,7 @@
    * Creates the popup if not previously created. Creates popup content element,
    * if it was provided with constructor.
    */
-  open(): Promise<GrPopupInterface> {
+  open(): Promise<PopupPluginApi> {
     if (!this._openingPromise) {
       this._openingPromise = this.plugin
         .hook('plugin-overlay')
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 701a560..e42ca08 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
@@ -16,9 +16,9 @@
  */
 import './gr-plugin-repo-command';
 import {ConfigInfo} from '../../../types/common';
-import {HookApi, PluginApi} from '../gr-plugin-types';
-
-type RepoCommandCallback = (repo?: string, config?: ConfigInfo) => boolean;
+import {PluginApi} from '../../../api/plugin';
+import {RepoCommandCallback, RepoPluginApi} from '../../../api/repo';
+import {HookApi} from '../../../api/hook';
 
 /**
  * Parameters provided on repo-command endpoint
@@ -28,7 +28,7 @@
   config: ConfigInfo;
 }
 
-export class GrRepoApi {
+export class GrRepoApi implements RepoPluginApi {
   private _hook?: HookApi;
 
   constructor(readonly plugin: PluginApi) {}
@@ -45,7 +45,7 @@
   createCommand(title: string, callback: RepoCommandCallback) {
     if (this._hook) {
       console.warn('Already set up.');
-      return this._hook;
+      return this;
     }
     this._hook = this._createHook(title);
     this._hook.onAttached(element => {
diff --git a/polygerrit-ui/app/elements/plugins/gr-settings-api/gr-settings-api.ts b/polygerrit-ui/app/elements/plugins/gr-settings-api/gr-settings-api.ts
index c7f1ecd..4bdd40e 100644
--- a/polygerrit-ui/app/elements/plugins/gr-settings-api/gr-settings-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-settings-api/gr-settings-api.ts
@@ -16,9 +16,10 @@
  */
 import '../../settings/gr-settings-view/gr-settings-item';
 import '../../settings/gr-settings-view/gr-settings-menu-item';
-import {PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {SettingsPluginApi} from '../../../api/settings';
 
-export class GrSettingsApi {
+export class GrSettingsApi implements SettingsPluginApi {
   private _token: string;
 
   private _title = '(no title)';
diff --git a/polygerrit-ui/app/elements/plugins/gr-styles-api/gr-styles-api.ts b/polygerrit-ui/app/elements/plugins/gr-styles-api/gr-styles-api.ts
index 5c57208..a91b8d3 100644
--- a/polygerrit-ui/app/elements/plugins/gr-styles-api/gr-styles-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-styles-api/gr-styles-api.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import {StyleObject, StylesPluginApi} from '../../../api/styles';
 
 /**
  * @fileoverview We should consider dropping support for this API:
@@ -30,7 +31,7 @@
   };
 }
 
-export class GrStyleObject {
+export class GrStyleObject implements StyleObject {
   private className = '';
 
   constructor(private readonly rulesStr: string) {
@@ -66,7 +67,6 @@
 
   /**
    * Apply shared style to the element.
-   *
    */
   apply(element: Element) {
     element.classList.add(this.getClassName(element));
@@ -76,7 +76,7 @@
 /**
  * TODO(TS): move to util
  */
-export class GrStylesApi {
+export class GrStylesApi implements StylesPluginApi {
   /**
    * Creates a new GrStyleObject with specified style properties.
    */
diff --git a/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api.ts b/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api.ts
index 821e4bf..894ec6c 100644
--- a/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api.ts
@@ -16,12 +16,13 @@
  */
 import './gr-custom-plugin-header';
 import {GrCustomPluginHeader} from './gr-custom-plugin-header';
-import {PluginApi} from '../gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {ThemePluginApi} from '../../../api/theme';
 
 /**
  * Defines api for theme, can be used to set header logo and title.
  */
-export class GrThemeApi {
+export class GrThemeApi implements ThemePluginApi {
   constructor(private readonly plugin: PluginApi) {}
 
   setHeaderLogoAndTitle(logoUrl: string, title: string) {
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 809139d..3c00a47 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
@@ -76,6 +76,7 @@
   'email_strategy',
   'diff_view',
   'publish_comments_on_push',
+  'disable_keyboard_shortcuts',
   'work_in_progress_by_default',
   'default_base_for_merges',
   'signed_off_by',
@@ -114,6 +115,7 @@
     workInProgressByDefault: HTMLInputElement;
     showSizeBarsInFileList: HTMLInputElement;
     publishCommentsOnPush: HTMLInputElement;
+    disableKeyboardShortcuts: HTMLInputElement;
     relativeDateInChangeTable: HTMLInputElement;
   };
 }
@@ -384,6 +386,13 @@
     );
   }
 
+  _handleDisableKeyboardShortcutsChanged() {
+    this.set(
+      '_localPrefs.disable_keyboard_shortcuts',
+      this.$.disableKeyboardShortcuts.checked
+    );
+  }
+
   _handleWorkInProgressByDefault() {
     this.set(
       '_localPrefs.work_in_progress_by_default',
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
index 11372a1..b141a86 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_html.ts
@@ -278,6 +278,19 @@
           </span>
         </section>
         <section>
+          <label for="disableKeyboardShortcuts" class="title"
+            >Disable all keyboard shortcuts</label
+          >
+          <span class="value">
+            <input
+              id="disableKeyboardShortcuts"
+              type="checkbox"
+              checked$="[[_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-comment-thread/gr-comment-thread.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
index cb64001..a5b7df7 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
@@ -17,6 +17,7 @@
 import '../../../styles/shared-styles';
 import '../gr-storage/gr-storage';
 import '../gr-comment/gr-comment';
+import '../../diff/gr-diff/gr-diff';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
@@ -24,6 +25,7 @@
 import {htmlTemplate} from './gr-comment-thread_html';
 import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {
+  computeDiffFromContext,
   isDraft,
   isRobot,
   sortComments,
@@ -33,9 +35,14 @@
 } from '../../../utils/comment-util';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {appContext} from '../../../services/app-context';
-import {CommentSide, Side, SpecialFilePath} from '../../../constants/constants';
+import {
+  CommentSide,
+  createDefaultDiffPrefs,
+  Side,
+  SpecialFilePath,
+} from '../../../constants/constants';
 import {computeDisplayPath} from '../../../utils/path-list-util';
-import {customElement, observe, property} from '@polymer/decorators';
+import {computed, customElement, observe, property} from '@polymer/decorators';
 import {
   CommentRange,
   ConfigInfo,
@@ -50,6 +57,10 @@
 import {CustomKeyboardEvent} from '../../../types/events';
 import {LineNumber, FILE} from '../../diff/gr-diff/gr-diff-line';
 import {GrButton} from '../gr-button/gr-button';
+import {KnownExperimentId} from '../../../services/flags/flags';
+import {DiffInfo, DiffPreferencesInfo} from '../../../types/diff';
+import {RenderPreferences} from '../../../api/diff';
+import {check, assertIsDefined} from '../../../utils/common-util';
 
 const UNRESOLVED_EXPAND_COUNT = 5;
 const NEWLINE_PATTERN = /\n/g;
@@ -122,7 +133,7 @@
   patchNum?: PatchSetNum;
 
   @property({type: String})
-  path?: string;
+  path: string | undefined;
 
   @property({type: String, observer: '_projectNameChanged'})
   projectName?: RepoName;
@@ -164,6 +175,15 @@
   @property({type: Object})
   _projectConfig?: ConfigInfo;
 
+  @property({type: Object})
+  _prefs: DiffPreferencesInfo = createDefaultDiffPrefs();
+
+  @property({type: Object})
+  _renderPrefs: RenderPreferences = {
+    hide_left_side: true,
+    disable_context_control_buttons: true,
+  };
+
   @property({type: Boolean, reflectToAttribute: true})
   isRobotComment = false;
 
@@ -176,6 +196,9 @@
   @property({type: Boolean})
   showPatchset = true;
 
+  @property({type: Boolean})
+  showCommentContext = false;
+
   get keyBindings() {
     return {
       'e shift+e': '_handleEKey',
@@ -188,6 +211,10 @@
 
   readonly storage = new GrStorage();
 
+  private isCommentContextExperimentEnabled = this.flagsService.isEnabled(
+    KnownExperimentId.COMMENT_CONTEXT
+  );
+
   readonly restApiService = appContext.restApiService;
 
   /** @override */
@@ -204,9 +231,34 @@
     this._getLoggedIn().then(loggedIn => {
       this._showActions = loggedIn;
     });
+    this.restApiService.getDiffPreferences().then(prefs => {
+      if (!prefs) return;
+      this._prefs = {
+        ...prefs,
+        show_file_comment_button: false,
+        // override explicitly so that diff doesn't take too much width
+        // compared to the context
+        line_wrapping: false,
+      };
+    });
     this._setInitialExpandedState();
   }
 
+  @computed('comments', 'path')
+  get _diff() {
+    if (this.comments === undefined || this.path === undefined) return;
+    if (!this.comments[0]?.context_lines?.length) return;
+    return computeDiffFromContext(this.comments[0].context_lines, this.path);
+  }
+
+  _shouldShowCommentContext(diff?: DiffInfo) {
+    return (
+      this.isCommentContextExperimentEnabled &&
+      this.showCommentContext &&
+      !!diff
+    );
+  }
+
   addOrEditDraft(lineNum?: LineNumber, rangeParam?: CommentRange) {
     const lastComment = this.comments[this.comments.length - 1] || {};
     if (isDraft(lastComment)) {
@@ -266,6 +318,32 @@
     return GerritNav.getUrlForComment(changeNum, projectName, id);
   }
 
+  getHighlightRange() {
+    const comment = this.comments?.[0];
+    if (!comment) return undefined;
+    if (comment.range) return comment.range;
+    if (comment.line) {
+      return {
+        start_line: comment.line,
+        start_character: 0,
+        end_line: comment.line,
+        end_character: 0,
+      };
+    }
+    return undefined;
+  }
+
+  _getUrlForViewDiff(comments: UIComment[]) {
+    assertIsDefined(this.changeNum, 'changeNum');
+    assertIsDefined(this.projectName, 'projectName');
+    check(comments.length > 0, 'comment not found');
+    return GerritNav.getUrlForComment(
+      this.changeNum,
+      this.projectName,
+      comments[0].id!
+    );
+  }
+
   _getDiffUrlForComment(
     projectName?: RepoName,
     changeNum?: NumericChangeId,
@@ -326,6 +404,10 @@
     return this.restApiService.getLoggedIn();
   }
 
+  _getUnresolvedLabel(unresolved?: boolean) {
+    return unresolved ? 'Unresolved' : 'Resolved';
+  }
+
   @observe('comments.*')
   _commentsChanged() {
     this._orderedComments = sortComments(this.comments);
@@ -551,8 +633,8 @@
   }
 
   _handleCommentDiscard(e: Event) {
-    if (!this.changeNum) throw new Error('changeNum is missing');
-    if (!this.patchNum) throw new Error('patchNum is missing');
+    assertIsDefined(this.changeNum, 'changeNum');
+    assertIsDefined(this.patchNum, 'patchNum');
     const diffCommentEl = (dom(e) as EventApi).rootTarget as GrComment;
     const comment = diffCommentEl.comment;
     const idx = this._indexOf(comment, this.comments);
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 ba541be..76bbd67 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
@@ -23,6 +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
+       * 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;
     }
     gr-button {
       margin-left: var(--spacing-m);
@@ -34,24 +40,29 @@
       margin-left: auto;
       padding: var(--spacing-s) var(--spacing-m);
     }
-    #container {
+    .comment-box {
+      width: 80ch;
+      max-width: 100%;
       background-color: var(--comment-background-color);
       color: var(--comment-text-color);
-      display: var(--gr-comment-thread-display, block);
-      margin: 0 var(--spacing-s) var(--spacing-s);
-      white-space: normal;
       box-shadow: var(--elevation-level-2);
       border-radius: var(--border-radius);
+    }
+    #container {
+      display: var(--gr-comment-thread-display, flex);
+      align-items: flex-start;
+      margin: 0 var(--spacing-s) var(--spacing-s);
+      white-space: normal;
       /** This is required for firefox to continue the inheritance */
       -webkit-user-select: inherit;
       -moz-user-select: inherit;
       -ms-user-select: inherit;
       user-select: inherit;
     }
-    #container.unresolved {
+    .comment-box.unresolved {
       background-color: var(--unresolved-comment-background-color);
     }
-    #container.robotComment {
+    .comment-box.robotComment {
       background-color: var(--robot-comment-background-color);
     }
     #commentInfoContainer {
@@ -75,7 +86,18 @@
     .fileName {
       padding: var(--spacing-m) var(--spacing-s) var(--spacing-m);
     }
+    .diff-container {
+      margin-left: var(--spacing-l);
+      border: 1px solid var(--border-color);
+    }
+    .view-diff-container {
+      text-align: end;
+    }
+    .view-diff-button {
+      margin: var(--spacing-m);
+    }
   </style>
+
   <template is="dom-if" if="[[showFilePath]]">
     <template is="dom-if" if="[[showFileName]]">
       <div class="fileName">
@@ -100,71 +122,91 @@
       </template>
     </div>
   </template>
-  <div
-    id="container"
-    class$="[[_computeHostClass(unresolved, isRobotComment)]]"
-  >
-    <template
-      id="commentList"
-      is="dom-repeat"
-      items="[[_orderedComments]]"
-      as="comment"
-    >
-      <gr-comment
-        comment="{{comment}}"
-        comments="{{comments}}"
-        robot-button-disabled="[[_shouldDisableAction(_showActions, _lastComment)]]"
-        change-num="[[changeNum]]"
-        project-name="[[projectName]]"
-        patch-num="[[patchNum]]"
-        draft="[[_isDraft(comment)]]"
-        show-actions="[[_showActions]]"
-        show-patchset="[[showPatchset]]"
-        show-ported-comment="[[_computeShowPortedComment(comment)]]"
-        side="[[comment.side]]"
-        project-config="[[_projectConfig]]"
-        on-create-fix-comment="_handleCommentFix"
-        on-comment-discard="_handleCommentDiscard"
-        on-comment-save="_handleCommentSavedOrDiscarded"
-      ></gr-comment>
-    </template>
-    <div
-      id="commentInfoContainer"
-      hidden$="[[_hideActions(_showActions, _lastComment)]]"
-    >
-      <span id="unresolvedLabel" hidden$="[[!unresolved]]">Unresolved</span>
-      <div id="actions">
-        <gr-button
-          id="replyBtn"
-          link=""
-          class="action reply"
-          on-click="_handleCommentReply"
-          >Reply</gr-button
-        >
-        <gr-button
-          id="quoteBtn"
-          link=""
-          class="action quote"
-          on-click="_handleCommentQuote"
-          >Quote</gr-button
-        >
-        <template is="dom-if" if="[[unresolved]]">
+  <div id="container">
+    <div class$="[[_computeHostClass(unresolved, isRobotComment)]] comment-box">
+      <template
+        id="commentList"
+        is="dom-repeat"
+        items="[[_orderedComments]]"
+        as="comment"
+      >
+        <gr-comment
+          comment="{{comment}}"
+          comments="{{comments}}"
+          robot-button-disabled="[[_shouldDisableAction(_showActions, _lastComment)]]"
+          change-num="[[changeNum]]"
+          project-name="[[projectName]]"
+          patch-num="[[patchNum]]"
+          draft="[[_isDraft(comment)]]"
+          show-actions="[[_showActions]]"
+          show-patchset="[[showPatchset]]"
+          show-ported-comment="[[_computeShowPortedComment(comment)]]"
+          side="[[comment.side]]"
+          project-config="[[_projectConfig]]"
+          on-create-fix-comment="_handleCommentFix"
+          on-comment-discard="_handleCommentDiscard"
+          on-comment-save="_handleCommentSavedOrDiscarded"
+        ></gr-comment>
+      </template>
+      <div
+        id="commentInfoContainer"
+        hidden$="[[_hideActions(_showActions, _lastComment)]]"
+      >
+        <span id="unresolvedLabel">[[_getUnresolvedLabel(unresolved)]]</span>
+        <div id="actions">
           <gr-button
-            id="ackBtn"
+            id="replyBtn"
             link=""
-            class="action ack"
-            on-click="_handleCommentAck"
-            >Ack</gr-button
+            class="action reply"
+            on-click="_handleCommentReply"
+            >Reply</gr-button
           >
           <gr-button
-            id="doneBtn"
+            id="quoteBtn"
             link=""
-            class="action done"
-            on-click="_handleCommentDone"
-            >Done</gr-button
+            class="action quote"
+            on-click="_handleCommentQuote"
+            >Quote</gr-button
           >
-        </template>
+          <template is="dom-if" if="[[unresolved]]">
+            <gr-button
+              id="ackBtn"
+              link=""
+              class="action ack"
+              on-click="_handleCommentAck"
+              >Ack</gr-button
+            >
+            <gr-button
+              id="doneBtn"
+              link=""
+              class="action done"
+              on-click="_handleCommentDone"
+              >Done</gr-button
+            >
+          </template>
+        </div>
       </div>
     </div>
+    <template is="dom-if" if="[[_shouldShowCommentContext(_diff)]]">
+      <div class="diff-container">
+        <gr-diff
+          id="diff"
+          change-num="[[changeNum]]"
+          diff="[[_diff]]"
+          path="[[path]]"
+          prefs="[[_prefs]]"
+          render-prefs="[[_renderPrefs]]"
+          highlight-range="[[getHighlightRange(comments)]]"
+        >
+        </gr-diff>
+        <div class="view-diff-container">
+          <a href="[[_getUrlForViewDiff(comments)]]">
+            <gr-button link class="view-diff-button" on-click="_handleViewDiff">
+              View Diff
+            </gr-button>
+          </a>
+        </div>
+      </div>
+    </template>
   </div>
 `;
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
index e1c6bff..f2df89d 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
@@ -836,7 +836,7 @@
     element.unresolved = false;
     const label = element.shadowRoot?.querySelector('#unresolvedLabel');
     assert.isOk(label);
-    assert.isTrue(label!.hasAttribute('hidden'));
+    assert.isFalse(label!.hasAttribute('hidden'));
     element.unresolved = true;
     assert.isFalse(label!.hasAttribute('hidden'));
   });
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index 898aff3..bf376f6 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -61,6 +61,7 @@
 import {OpenFixPreviewEventDetail} from '../../../types/events';
 import {fireAlert} from '../../../utils/event-util';
 import {pluralize} from '../../../utils/string-util';
+import {assertIsDefined} from '../../../utils/common-util';
 
 const STORAGE_DEBOUNCE_INTERVAL = 400;
 const TOAST_DEBOUNCE_INTERVAL = 200;
@@ -322,7 +323,7 @@
   }
 
   _handlePortedMessageClick() {
-    if (!this.comment) throw new Error('comment not set');
+    assertIsDefined(this.comment, 'comment');
     this.reporting.reportInteraction('navigate-to-original-comment', {
       line: this.comment.line,
       range: this.comment.range,
@@ -496,10 +497,8 @@
     // prior to it being saved.
     this.cancelDebouncer(DEBOUNCER_STORE);
 
-    if (!this.comment?.path) throw new Error('Cannot erase Draft Comment');
-    if (this.changeNum === undefined) {
-      throw new Error('undefined changeNum');
-    }
+    assertIsDefined(this.comment?.path, 'comment.path');
+    assertIsDefined(this.changeNum, 'changeNum');
     this.storage.eraseDraftComment({
       changeNum: this.changeNum,
       patchNum: this._getPatchNum(),
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
index 6605394..374cc62 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
@@ -32,13 +32,13 @@
       padding: var(--spacing-m);
     }
     :host([collapsed]) .viewer,
-    .viewer[collapsed] {
+    .viewer.new-change-summary-true[collapsed] {
       max-height: var(--collapsed-max-height, 300px);
       overflow: hidden;
     }
     .editor.new-change-summary-true iron-autogrow-textarea,
     .viewer.new-change-summary-true {
-      min-height: 160px;
+      min-height: 100px;
     }
     .editor iron-autogrow-textarea {
       background-color: var(--view-background-color);
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
index 592f7903..ddae8ea 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
@@ -45,6 +45,7 @@
 import {ReviewerState} from '../../../constants/constants';
 import {CURRENT} from '../../../utils/patch-set-util';
 import {isInvolved, isRemovableReviewer} from '../../../utils/change-util';
+import {assertIsDefined} from '../../../utils/common-util';
 
 @customElement('gr-hovercard-account')
 export class GrHovercardAccount extends GestureEventListeners(
@@ -163,7 +164,7 @@
   }
 
   _handleChangeReviewerOrCCStatus() {
-    if (!this.change) throw new Error('expected change object to be present');
+    assertIsDefined(this.change, 'change');
     // accountKey() throws an error if _account_id & email is not found, which
     // we want to check before showing reloading toast
     const _accountKey = accountKey(this.account);
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts
index a493e51..6a4da7b 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts
@@ -19,6 +19,7 @@
 import {GrStyleObject} from '../../plugins/gr-styles-api/gr-styles-api';
 import {GrDiffLine} from '../../diff/gr-diff/gr-diff-line';
 import {appContext} from '../../../services/app-context';
+import {AnnotationContext} from '../../../api/annotation';
 
 /**
  * Used to create a context for GrAnnotationActionsInterface.
@@ -32,7 +33,7 @@
  * @param changeNum The Gerrit change number.
  * @param patchNum The Gerrit patch number.
  */
-export class GrAnnotationActionsContext {
+export class GrAnnotationActionsContext implements AnnotationContext {
   private _contentEl: HTMLElement;
 
   private _lineNumberEl: HTMLElement;
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 f160807..4abc6e1 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
@@ -16,34 +16,18 @@
  */
 import {GrAnnotationActionsContext} from './gr-annotation-actions-context';
 import {GrDiffLine} from '../../diff/gr-diff/gr-diff-line';
-import {
-  CoverageRange,
-  DiffLayer,
-  DiffLayerListener,
-} from '../../../types/types';
+import {DiffLayer, DiffLayerListener} from '../../../types/types';
 import {Side} from '../../../constants/constants';
-import {PluginApi} from '../../plugins/gr-plugin-types';
-import {ChangeInfo, NumericChangeId} from '../../../types/common';
+import {EventType, PluginApi} from '../../../api/plugin';
 import {appContext} from '../../../services/app-context';
+import {
+  AddLayerFunc,
+  AnnotationPluginApi,
+  CoverageProvider,
+  NotifyFunc,
+} from '../../../api/annotation';
 
-type AddLayerFunc = (ctx: GrAnnotationActionsContext) => void;
-
-type NotifyFunc = (
-  path: string,
-  start: number,
-  end: number,
-  side: Side
-) => void;
-
-export type CoverageProvider = (
-  changeNum: NumericChangeId,
-  path: string,
-  basePatchNum?: number,
-  patchNum?: number,
-  change?: ChangeInfo
-) => Promise<Array<CoverageRange>>;
-
-export class GrAnnotationActionsInterface {
+export class GrAnnotationActionsInterface implements AnnotationPluginApi {
   // Collect all annotation layers instantiated by getLayer. Will be used when
   // notifying their listeners in the notify function.
   private annotationLayers: AnnotationLayer[] = [];
@@ -57,7 +41,7 @@
 
   constructor(private readonly plugin: PluginApi) {
     // Return this instance when there is an annotatediff event.
-    plugin.on('annotatediff', this);
+    plugin.on(EventType.ANNOTATE_DIFF, this);
   }
 
   /**
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 9ae2900..2f2b5ce 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
@@ -14,47 +14,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {
-  ActionType,
-  ActionPriority,
-} from '../../../services/gr-rest-api/gr-rest-api';
-import {PluginApi, TargetElement} from '../../plugins/gr-plugin-types';
+import {PluginApi, TargetElement} from '../../../api/plugin';
 import {ActionInfo, RequireProperties} from '../../../types/common';
 import {appContext} from '../../../services/app-context';
-
-export enum ChangeActions {
-  ABANDON = 'abandon',
-  DELETE = '/',
-  DELETE_EDIT = 'deleteEdit',
-  EDIT = 'edit',
-  FOLLOW_UP = 'followup',
-  IGNORE = 'ignore',
-  MOVE = 'move',
-  PRIVATE = 'private',
-  PRIVATE_DELETE = 'private.delete',
-  PUBLISH_EDIT = 'publishEdit',
-  REBASE = 'rebase',
-  REBASE_EDIT = 'rebaseEdit',
-  READY = 'ready',
-  RESTORE = 'restore',
-  REVERT = 'revert',
-  REVERT_SUBMISSION = 'revert_submission',
-  REVIEWED = 'reviewed',
-  STOP_EDIT = 'stopEdit',
-  SUBMIT = 'submit',
-  UNIGNORE = 'unignore',
-  UNREVIEWED = 'unreviewed',
-  WIP = 'wip',
-}
-
-export enum RevisionActions {
-  CHERRYPICK = 'cherrypick',
-  REBASE = 'rebase',
-  SUBMIT = 'submit',
-  DOWNLOAD = 'download',
-}
-
-export type PrimaryActionKey = ChangeActions | RevisionActions;
+import {
+  ActionPriority,
+  ActionType,
+  ChangeActions,
+  ChangeActionsPluginApi,
+  PrimaryActionKey,
+  RevisionActions,
+} from '../../../api/change-actions';
 
 export interface UIActionInfo extends RequireProperties<ActionInfo, 'label'> {
   __key: string;
@@ -89,7 +59,7 @@
   getActionDetails(actionName: string): ActionInfo | undefined;
 }
 
-export class GrChangeActionsInterface {
+export class GrChangeActionsInterface implements ChangeActionsPluginApi {
   private _el?: GrChangeActionsElement;
 
   RevisionActions = RevisionActions;
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-reply-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-reply-js-api.ts
index 74130af..effebe1 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-reply-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-reply-js-api.ts
@@ -16,25 +16,20 @@
  */
 
 import {GrReplyDialog} from '../../../services/gr-rest-api/gr-rest-api';
-import {PluginApi, TargetElement} from '../../plugins/gr-plugin-types';
+import {PluginApi, TargetElement} from '../../../api/plugin';
 import {JsApiService} from './gr-js-api-types';
-
-// TODO(TS): maybe move interfaces\types to other files when convertion complete
-interface LabelsChangedDetail {
-  name: string;
-  value: string;
-}
-interface ValueChangedDetail {
-  value: string;
-}
-
-type ReplyChangedCallback = (text: string) => void;
-type LabelsChangedCallback = (detail: LabelsChangedDetail) => void;
+import {
+  ChangeReplyPluginApi,
+  LabelsChangedCallback,
+  LabelsChangedDetail,
+  ReplyChangedCallback,
+  ValueChangedDetail,
+} from '../../../api/change-reply';
 
 /**
  * GrChangeReplyInterface, provides a set of handy methods on reply dialog.
  */
-export class GrChangeReplyInterface {
+export class GrChangeReplyInterface implements ChangeReplyPluginApi {
   constructor(
     readonly plugin: PluginApi,
     readonly sharedApiElement: JsApiService
@@ -46,7 +41,7 @@
     ) as unknown) as GrReplyDialog;
   }
 
-  getLabelValue(label: string) {
+  getLabelValue(label: string): string {
     return this._el.getLabelValue(label);
   }
 
@@ -100,6 +95,6 @@
   }
 
   showMessage(message: string) {
-    return this._el.setPluginMessage(message);
+    this._el.setPluginMessage(message);
   }
 }
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 32a9238..27bc591 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
@@ -26,7 +26,7 @@
 } from './gr-plugin-loader';
 import {send} from './gr-api-utils';
 import {appContext} from '../../../services/app-context';
-import {PluginApi} from '../../plugins/gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
 import {HttpMethod} from '../../../constants/constants';
 import {RequestPayload} from '../../../types/common';
 import {
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts
index 412165d..830fb92 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts
@@ -23,16 +23,17 @@
   RevisionInfo,
 } from '../../../types/common';
 import {GrAnnotationActionsInterface} from './gr-annotation-actions-js-api';
-import {GrAdminApi, MenuLink} from '../../plugins/gr-admin-api/gr-admin-api';
+import {GrAdminApi} from '../../plugins/gr-admin-api/gr-admin-api';
 import {
   JsApiService,
   EventCallback,
   ShowChangeDetail,
   ShowRevisionActionsDetail,
 } from './gr-js-api-types';
-import {EventType, TargetElement} from '../../plugins/gr-plugin-types';
+import {EventType, TargetElement} from '../../../api/plugin';
 import {DiffLayer, HighlightJS, ParsedChangeInfo} from '../../../types/types';
 import {appContext} from '../../../services/app-context';
+import {MenuLink} from '../../../api/admin';
 
 const elements: {[key: string]: HTMLElement} = {};
 const eventCallbacks: {[key: string]: EventCallback[]} = {};
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 47b6006..6a8a0dd 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
@@ -19,7 +19,7 @@
 import './gr-js-api-interface.js';
 import {GrPopupInterface} from '../../plugins/gr-popup-interface/gr-popup-interface.js';
 import {GrSettingsApi} from '../../plugins/gr-settings-api/gr-settings-api.js';
-import {EventType} from '../../plugins/gr-plugin-types.js';
+import {EventType} from '../../../api/plugin.js';
 import {PLUGIN_LOADING_TIMEOUT_MS} from './gr-api-utils.js';
 import {getPluginLoader} from './gr-plugin-loader.js';
 import {_testOnly_initGerritPluginApi} from './gr-gerrit.js';
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-types.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-types.ts
index 37db662..0b28c5e 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-types.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-types.ts
@@ -21,10 +21,10 @@
   ReviewInput,
   RevisionInfo,
 } from '../../../types/common';
-import {EventType, TargetElement} from '../../plugins/gr-plugin-types';
+import {EventType, TargetElement} from '../../../api/plugin';
 import {DiffLayer, ParsedChangeInfo} from '../../../types/types';
 import {GrAnnotationActionsInterface} from './gr-annotation-actions-js-api';
-import {MenuLink} from '../../plugins/gr-admin-api/gr-admin-api';
+import {MenuLink} from '../../../api/admin';
 
 export interface ShowChangeDetail {
   change: ChangeInfo;
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 d4a2bd6..21e4876 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
@@ -17,20 +17,18 @@
 
 import {RevisionInfo, ChangeInfo, RequestPayload} from '../../../types/common';
 import {ShowAlertEventDetail} from '../../../types/events';
-import {PluginApi} from '../../plugins/gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
 import {UIActionInfo} from './gr-change-actions-js-api';
 import {windowLocationReload} from '../../../utils/dom-util';
-
-interface GrPopupInterface {
-  close(): void;
-}
+import {PopupPluginApi} from '../../../api/popup';
+import {GrPopupInterface} from '../../plugins/gr-popup-interface/gr-popup-interface';
 
 interface ButtonCallBacks {
   onclick: (event: Event) => boolean;
 }
 
 export class GrPluginActionContext {
-  private _popups: GrPopupInterface[] = [];
+  private _popups: PopupPluginApi[] = [];
 
   constructor(
     public readonly plugin: PluginApi,
@@ -41,7 +39,7 @@
 
   popup(element: Node) {
     this.plugin.popup().then(popApi => {
-      const popupEl = popApi._getElement();
+      const popupEl = (popApi as GrPopupInterface)._getElement();
       if (!popupEl) {
         throw new Error('Popup element not found');
       }
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 da19e5b..2752c74 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
@@ -16,8 +16,9 @@
  */
 
 import {importHref} from '../../../scripts/import-href';
-import {HookApi, PluginApi} from '../../plugins/gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
 import {notUndefined} from '../../../types/types';
+import {HookApi} from '../../../api/hook';
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type Callback = (value: any) => void;
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 aacef0e..8c0fce26 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
@@ -24,7 +24,7 @@
 import {Plugin} from './gr-public-js-api';
 import {getBaseUrl} from '../../../utils/url-util';
 import {getPluginEndpoints} from './gr-plugin-endpoints';
-import {PluginApi} from '../../plugins/gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
 import {ReportingService} from '../../../services/gr-reporting/gr-reporting';
 import {hasOwnProperty} from '../../../utils/common-util';
 import {ShowAlertEventDetail} from '../../../types/events';
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts
index e640ba1..cd35d4e 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts
@@ -14,10 +14,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {ErrorCallback} from '../../../services/gr-rest-api/gr-rest-api';
 import {HttpMethod} from '../../../constants/constants';
 import {RequestPayload} from '../../../types/common';
 import {appContext} from '../../../services/app-context';
+import {ErrorCallback, RestPluginApi} from '../../../api/rest';
 
 async function getErrorMessage(response: Response): Promise<string> {
   const text = await response.text();
@@ -33,7 +33,7 @@
   }
 }
 
-export class GrPluginRestApi {
+export class GrPluginRestApi implements RestPluginApi {
   private readonly restApi = appContext.restApiService;
 
   constructor(private readonly prefix = '') {}
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 f21ddc6..45ffdcd9 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
@@ -32,20 +32,28 @@
 import {GrStylesApi} from '../../plugins/gr-styles-api/gr-styles-api';
 import {getPluginEndpoints} from './gr-plugin-endpoints';
 
-import {PRELOADED_PROTOCOL, getPluginNameFromUrl, send} from './gr-api-utils';
+import {getPluginNameFromUrl, PRELOADED_PROTOCOL, send} from './gr-api-utils';
 import {GrReportingJsApi} from './gr-reporting-js-api';
-import {
-  EventType,
-  HookApi,
-  PluginApi,
-  RegisterOptions,
-  TargetElement,
-} from '../../plugins/gr-plugin-types';
+import {EventType, PluginApi, TargetElement} from '../../../api/plugin';
 import {RequestPayload} from '../../../types/common';
 import {HttpMethod} from '../../../constants/constants';
 import {GrChangeActions} from '../../change/gr-change-actions/gr-change-actions';
 import {GrChecksApi} from '../../plugins/gr-checks-api/gr-checks-api';
 import {appContext} from '../../../services/app-context';
+import {AdminPluginApi} from '../../../api/admin';
+import {AnnotationPluginApi} from '../../../api/annotation';
+import {StylesPluginApi} from '../../../api/styles';
+import {ThemePluginApi} from '../../../api/theme';
+import {EventHelperPluginApi} from '../../../api/event-helper';
+import {PopupPluginApi} from '../../../api/popup';
+import {SettingsPluginApi} from '../../../api/settings';
+import {ReportingPluginApi} from '../../../api/reporting';
+import {ChangeActionsPluginApi} from '../../../api/change-actions';
+import {ChangeMetadataPluginApi} from '../../../api/change-metadata';
+import {RepoPluginApi} from '../../../api/repo';
+import {ChangeReplyPluginApi} from '../../../api/change-reply';
+import {RestPluginApi} from '../../../api/rest';
+import {HookApi, RegisterOptions} from '../../../api/hook';
 
 /**
  * Plugin-provided custom components can affect content in extension
@@ -232,11 +240,11 @@
       });
   }
 
-  annotationApi() {
+  annotationApi(): AnnotationPluginApi {
     return new GrAnnotationActionsInterface(this);
   }
 
-  changeActions() {
+  changeActions(): ChangeActionsPluginApi {
     return new GrChangeActionsInterface(
       this,
       (this.jsApi.getElement(
@@ -245,7 +253,7 @@
     );
   }
 
-  changeReply() {
+  changeReply(): ChangeReplyPluginApi {
     return new GrChangeReplyInterface(this, this.jsApi);
   }
 
@@ -253,42 +261,35 @@
     return new GrChecksApi(this);
   }
 
-  reporting() {
+  reporting(): ReportingPluginApi {
     return new GrReportingJsApi(this);
   }
 
-  theme() {
+  theme(): ThemePluginApi {
     return new GrThemeApi(this);
   }
 
-  project() {
+  project(): RepoPluginApi {
     return new GrRepoApi(this);
   }
 
-  changeMetadata() {
+  changeMetadata(): ChangeMetadataPluginApi {
     return new GrChangeMetadataApi(this);
   }
 
-  admin() {
+  admin(): AdminPluginApi {
     return new GrAdminApi(this);
   }
 
-  settings() {
+  settings(): SettingsPluginApi {
     return new GrSettingsApi(this);
   }
 
-  styles() {
+  styles(): StylesPluginApi {
     return new GrStylesApi();
   }
 
-  /**
-   * To make REST requests for plugin-provided endpoints, use
-   *
-   * @example
-   * const pluginRestApi = plugin.restApi(plugin.url());
-   * @param prefix url for subsequent .get(), .post() etc requests.
-   */
-  restApi(prefix?: string) {
+  restApi(prefix?: string): RestPluginApi {
     return new GrPluginRestApi(prefix);
   }
 
@@ -296,15 +297,15 @@
     return new GrAttributeHelper(element);
   }
 
-  eventHelper(element: HTMLElement) {
+  eventHelper(element: HTMLElement): EventHelperPluginApi {
     return new GrEventHelper(element);
   }
 
-  popup(): Promise<GrPopupInterface>;
+  popup(): Promise<PopupPluginApi>;
 
-  popup(moduleName: string): Promise<GrPopupInterface>;
+  popup(moduleName: string): Promise<PopupPluginApi>;
 
-  popup(moduleName?: string): Promise<GrPopupInterface | null> {
+  popup(moduleName?: string): Promise<PopupPluginApi | null> {
     if (moduleName !== undefined && typeof moduleName !== 'string') {
       console.error('.popup(element) deprecated, use .popup(moduleName)!');
       return Promise.resolve(null);
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-reporting-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-reporting-js-api.ts
index 87b320c4..d4b51a8 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-reporting-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-reporting-js-api.ts
@@ -16,26 +16,26 @@
  */
 
 import {appContext} from '../../../services/app-context';
-import {EventDetails} from '../../../services/gr-reporting/gr-reporting';
-import {PluginApi} from '../../plugins/gr-plugin-types';
+import {PluginApi} from '../../../api/plugin';
+import {EventDetails, ReportingPluginApi} from '../../../api/reporting';
 
 /**
  * Defines all methods that will be exported to plugin from reporting service.
  */
-export class GrReportingJsApi {
+export class GrReportingJsApi implements ReportingPluginApi {
   private readonly reporting = appContext.reportingService;
 
   constructor(private readonly plugin: PluginApi) {}
 
   reportInteraction(eventName: string, details?: EventDetails) {
-    return this.reporting.reportInteraction(
+    this.reporting.reportInteraction(
       `${this.plugin.getPluginName()}-${eventName}`,
       details
     );
   }
 
   reportLifeCycle(eventName: string, details?: EventDetails) {
-    return this.reporting.reportLifeCycle(
+    this.reporting.reportLifeCycle(
       `${this.plugin.getPluginName()}-${eventName}`,
       details
     );
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
index 70f68ae..60a07a4 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
@@ -223,7 +223,7 @@
     if (
       !labelInfo ||
       !isDetailedLabelInfo(labelInfo) ||
-      !labelInfo.values[score]
+      !labelInfo.values?.[score]
     ) {
       return '';
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.ts b/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.ts
index 329cc7e..655acde 100644
--- a/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.ts
+++ b/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.ts
@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 import '../gr-js-api-interface/gr-js-api-interface';
-import {EventType} from '../../plugins/gr-plugin-types';
+import {EventType} from '../../../api/plugin';
 import {HighlightJS} from '../../../types/types';
 import {appContext} from '../../../services/app-context';
 
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
index 84d84b1..ec59ddc 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
@@ -139,7 +139,6 @@
 } from '../../../types/diff';
 import {
   CancelConditionCallback,
-  ErrorCallback,
   GetDiffCommentsOutput,
   GetDiffRobotCommentsOutput,
   RestApiService,
@@ -155,6 +154,7 @@
 } from '../../../constants/constants';
 import {firePageError, fireServerError} from '../../../utils/event-util';
 import {ParsedChangeInfo} from '../../../types/types';
+import {ErrorCallback} from '../../../api/rest';
 
 const MAX_PROJECT_RESULTS = 25;
 // This value is somewhat arbitrary and not based on research or calculations.
@@ -2232,11 +2232,15 @@
     path?: string
   ) {
     if (!basePatchNum && !patchNum && !path) {
-      return this._getDiffComments(changeNum, '/comments');
+      return this._getDiffComments(changeNum, '/comments', {
+        'enable-context': true,
+        'context-padding': 3,
+      });
     }
     return this._getDiffComments(
       changeNum,
       '/comments',
+      {'enable-context': true, 'context-padding': 3},
       basePatchNum,
       patchNum,
       path
@@ -2267,6 +2271,7 @@
     return this._getDiffComments(
       changeNum,
       '/robotcomments',
+      undefined,
       basePatchNum,
       patchNum,
       path
@@ -2305,6 +2310,7 @@
       return this._getDiffComments(
         changeNum,
         '/drafts',
+        undefined,
         basePatchNum,
         patchNum,
         path
@@ -2337,7 +2343,8 @@
 
   _getDiffComments(
     changeNum: NumericChangeId,
-    endpoint: '/comments' | '/drafts'
+    endpoint: '/comments' | '/drafts',
+    params?: FetchParams
   ): Promise<PathToCommentsInfoMap | undefined>;
 
   _getDiffComments(
@@ -2348,6 +2355,7 @@
   _getDiffComments(
     changeNum: NumericChangeId,
     endpoint: '/comments' | '/drafts',
+    params?: FetchParams,
     basePatchNum?: PatchSetNum,
     patchNum?: PatchSetNum,
     path?: string
@@ -2356,6 +2364,7 @@
   _getDiffComments(
     changeNum: NumericChangeId,
     endpoint: '/robotcomments',
+    params?: FetchParams,
     basePatchNum?: PatchSetNum,
     patchNum?: PatchSetNum,
     path?: string
@@ -2364,6 +2373,7 @@
   _getDiffComments(
     changeNum: NumericChangeId,
     endpoint: string,
+    params?: FetchParams,
     basePatchNum?: PatchSetNum,
     patchNum?: PatchSetNum,
     path?: string
@@ -2388,6 +2398,7 @@
           endpoint,
           revision: patchNum,
           reportEndpointAsIs: true,
+          params,
         },
         noAcceptHeader
       ) as Promise<
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js
index 6db2bff..7cbcaef 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js
@@ -75,7 +75,8 @@
             },
           ],
         }));
-    return element._getDiffComments('42', '', 'PARENT', 1, 'sieve.go').then(
+    return element._getDiffComments('42', '', undefined, 'PARENT', 1,
+        'sieve.go').then(
         obj => {
           assert.equal(obj.baseComments.length, 1);
           assert.deepEqual(obj.baseComments[0], {
@@ -239,7 +240,7 @@
         });
       }
     });
-    return element._getDiffComments('42', '', 1, 2, 'sieve.go').then(
+    return element._getDiffComments('42', '', undefined, 1, 2, 'sieve.go').then(
         obj => {
           assert.equal(obj.baseComments.length, 1);
           assert.deepEqual(obj.baseComments[0], {
@@ -395,12 +396,10 @@
     sinon.stub(element, 'getLoggedIn').callsFake(() => Promise.resolve(false));
 
     return element.getDiffPreferences().then(obj => {
-      assert.equal(obj.auto_hide_diff_table_header, true);
       assert.equal(obj.context, 10);
       assert.equal(obj.cursor_blink_rate, 0);
       assert.equal(obj.font_size, 12);
       assert.equal(obj.ignore_whitespace, 'IGNORE_NONE');
-      assert.equal(obj.intraline_difference, true);
       assert.equal(obj.line_length, 100);
       assert.equal(obj.line_wrapping, false);
       assert.equal(obj.show_line_endings, true);
@@ -408,7 +407,6 @@
       assert.equal(obj.show_whitespace_errors, true);
       assert.equal(obj.syntax_highlighting, true);
       assert.equal(obj.tab_size, 8);
-      assert.equal(obj.theme, 'DEFAULT');
     });
   });
 
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 710445c..fa2a28e 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
@@ -15,10 +15,7 @@
  * limitations under the License.
  */
 import {getBaseUrl} from '../../../../utils/url-util';
-import {
-  CancelConditionCallback,
-  ErrorCallback,
-} from '../../../../services/gr-rest-api/gr-rest-api';
+import {CancelConditionCallback} from '../../../../services/gr-rest-api/gr-rest-api';
 import {
   AuthRequestInit,
   AuthService,
@@ -33,6 +30,7 @@
 import {RpcLogEventDetail} from '../../../../types/events';
 import {fireNetworkError, fireServerError} from '../../../../utils/event-util';
 import {FetchRequest} from '../../../../types/types';
+import {ErrorCallback} from '../../../../api/rest';
 
 export const JSON_PREFIX = ")]}'";
 
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 881e102..7050cbe 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
@@ -107,6 +107,7 @@
   CustomKeyboardEvent,
   ShortcutTriggeredEventDetail,
 } from '../../types/events';
+import {appContext} from '../../services/app-context';
 
 /** Enum for all special shortcuts */
 export enum SPECIAL_SHORTCUT {
@@ -175,7 +176,7 @@
   VISIBLE_LINE = 'VISIBLE_LINE',
   NEXT_CHUNK = 'NEXT_CHUNK',
   PREV_CHUNK = 'PREV_CHUNK',
-  EXPAND_ALL_DIFF_CONTEXT = 'EXPAND_ALL_DIFF_CONTEXT',
+  TOGGLE_ALL_DIFF_CONTEXT = 'TOGGLE_ALL_DIFF_CONTEXT',
   NEXT_COMMENT_THREAD = 'NEXT_COMMENT_THREAD',
   PREV_COMMENT_THREAD = 'PREV_COMMENT_THREAD',
   EXPAND_ALL_COMMENT_THREADS = 'EXPAND_ALL_COMMENT_THREADS',
@@ -403,9 +404,9 @@
   'Go to previous diff chunk'
 );
 _describe(
-  Shortcut.EXPAND_ALL_DIFF_CONTEXT,
+  Shortcut.TOGGLE_ALL_DIFF_CONTEXT,
   ShortcutSection.DIFFS,
-  'Expand all diff context'
+  'Toggle all diff context'
 );
 _describe(
   Shortcut.NEXT_COMMENT_THREAD,
@@ -805,6 +806,10 @@
 
       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.
@@ -826,6 +831,7 @@
       }
 
       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;
@@ -926,6 +932,13 @@
       /** @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/services/flags/flags.ts b/polygerrit-ui/app/services/flags/flags.ts
index 891716b..878b8f7 100644
--- a/polygerrit-ui/app/services/flags/flags.ts
+++ b/polygerrit-ui/app/services/flags/flags.ts
@@ -30,4 +30,6 @@
   CI_REBOOT_CHECKS = 'UiFeature__ci_reboot_checks',
   NEW_CHANGE_SUMMARY_UI = 'UiFeature__new_change_summary_ui',
   PORTING_COMMENTS = 'UiFeature__porting_comments',
+  NEW_IMAGE_DIFF_UI = 'UiFeature__new_image_diff_ui',
+  COMMENT_CONTEXT = 'UiFeature__comment_context',
 }
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
index 7035f26..4ca983a 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
@@ -16,13 +16,10 @@
  */
 
 import {NumericChangeId} from '../../types/common';
+import {EventDetails} from '../../api/reporting';
 
 export type EventValue = string | number | {error?: Error};
 
-// TODO(dmfilippov): TS-fix-any use more specific type instead if possible
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export type EventDetails = any;
-
 export interface Timer {
   reset(): this;
   end(): this;
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 657a3f4..f80cb75 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
@@ -16,14 +16,10 @@
  */
 import {AppContext} from '../app-context';
 import {FlagsService} from '../flags/flags';
-import {
-  EventDetails,
-  EventValue,
-  ReportingService,
-  Timer,
-} from './gr-reporting';
+import {EventValue, ReportingService, Timer} from './gr-reporting';
 import {hasOwnProperty} from '../../utils/common-util';
 import {NumericChangeId} from '../../types/common';
+import {EventDetails} from '../../api/reporting';
 
 // Latency reporting constants.
 
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts
index 2b42a6b..484ce45 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts
@@ -14,7 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import {EventDetails, ReportingService, Timer} from './gr-reporting';
+import {ReportingService, Timer} from './gr-reporting';
+import {EventDetails} from '../../api/reporting';
 
 export class MockTimer implements Timer {
   end(): this {
diff --git a/polygerrit-ui/app/services/gr-rest-api/gr-rest-api.ts b/polygerrit-ui/app/services/gr-rest-api/gr-rest-api.ts
index 6fec5f0..4742e65 100644
--- a/polygerrit-ui/app/services/gr-rest-api/gr-rest-api.ts
+++ b/polygerrit-ui/app/services/gr-rest-api/gr-rest-api.ts
@@ -17,88 +17,88 @@
 
 import {HttpMethod} from '../../constants/constants';
 import {
+  AccountCapabilityInfo,
   AccountDetailInfo,
   AccountExternalIdInfo,
+  AccountId,
   AccountInfo,
-  NumericChangeId,
-  ServerInfo,
-  ProjectInfo,
-  AccountCapabilityInfo,
-  SuggestedReviewerInfo,
-  GroupNameToGroupInfoMap,
-  ParsedJSON,
-  PatchSetNum,
-  RequestPayload,
-  PreferencesInput,
-  EditPreferencesInfo,
-  DiffPreferenceInput,
-  SshKeyInfo,
-  RepoName,
-  BranchName,
-  BranchInput,
-  TagInput,
-  GpgKeysInput,
-  GpgKeyId,
-  GpgKeyInfo,
-  PreferencesInfo,
-  EmailInfo,
-  ProjectAccessInfo,
-  CapabilityInfoMap,
-  ProjectAccessInput,
-  ChangeInfo,
-  ProjectInfoWithName,
-  GroupId,
-  GroupInfo,
-  GroupOptionsInput,
+  ActionNameToActionInfoMap,
+  Base64FileContent,
+  BlameInfo,
   BranchInfo,
-  ConfigInfo,
-  ReviewInput,
-  EditInfo,
+  BranchInput,
+  BranchName,
+  CapabilityInfoMap,
   ChangeId,
-  DashboardInfo,
-  ProjectAccessInfoMap,
-  IncludedInInfo,
-  RobotCommentInfo,
+  ChangeInfo,
+  ChangeMessageId,
   CommentInfo,
-  PathToCommentsInfoMap,
-  PathToRobotCommentsInfoMap,
   CommentInput,
-  GroupInput,
-  PluginInfo,
-  DocResult,
+  CommitInfo,
+  ConfigInfo,
+  ConfigInput,
   ContributorAgreementInfo,
   ContributorAgreementInput,
-  Password,
-  ProjectWatchInfo,
-  NameToProjectInfoMap,
-  ProjectInput,
-  AccountId,
-  ChangeMessageId,
-  GroupAuditEventInfo,
-  EncodedGroupId,
-  Base64FileContent,
-  UrlEncodedCommentId,
-  TagInfo,
-  GitRef,
-  ConfigInput,
-  RelatedChangesInfo,
-  SubmittedTogetherInfo,
-  EmailAddress,
-  FixId,
-  FilePathToDiffInfoMap,
-  BlameInfo,
-  PatchRange,
-  ImagesForDiff,
-  ActionNameToActionInfoMap,
-  RevisionId,
-  GroupName,
   DashboardId,
-  HashtagsInput,
-  Hashtag,
+  DashboardInfo,
+  DiffPreferenceInput,
+  DocResult,
+  EditInfo,
+  EditPreferencesInfo,
+  EmailAddress,
+  EmailInfo,
+  EncodedGroupId,
   FileNameToFileInfoMap,
-  TopMenuEntryInfo,
+  FilePathToDiffInfoMap,
+  FixId,
+  GitRef,
+  GpgKeyId,
+  GpgKeyInfo,
+  GpgKeysInput,
+  GroupAuditEventInfo,
+  GroupId,
+  GroupInfo,
+  GroupInput,
+  GroupName,
+  GroupNameToGroupInfoMap,
+  GroupOptionsInput,
+  Hashtag,
+  HashtagsInput,
+  ImagesForDiff,
+  IncludedInInfo,
   MergeableInfo,
-  CommitInfo,
+  NameToProjectInfoMap,
+  NumericChangeId,
+  ParsedJSON,
+  Password,
+  PatchRange,
+  PatchSetNum,
+  PathToCommentsInfoMap,
+  PathToRobotCommentsInfoMap,
+  PluginInfo,
+  PreferencesInfo,
+  PreferencesInput,
+  ProjectAccessInfo,
+  ProjectAccessInfoMap,
+  ProjectAccessInput,
+  ProjectInfo,
+  ProjectInfoWithName,
+  ProjectInput,
+  ProjectWatchInfo,
+  RelatedChangesInfo,
+  RepoName,
+  RequestPayload,
+  ReviewInput,
+  RevisionId,
+  RobotCommentInfo,
+  ServerInfo,
+  SshKeyInfo,
+  SubmittedTogetherInfo,
+  SuggestedReviewerInfo,
+  TagInfo,
+  TagInput,
+  TopMenuEntryInfo,
+  UrlEncodedCommentId,
 } from '../../types/common';
 import {
   DiffInfo,
@@ -106,8 +106,8 @@
   IgnoreWhitespaceType,
 } from '../../types/diff';
 import {ParsedChangeInfo} from '../../types/types';
+import {ErrorCallback} from '../../api/rest';
 
-export type ErrorCallback = (response?: Response | null, err?: Error) => void;
 export type CancelConditionCallback = () => boolean;
 
 // TODO(TS): remove when GrReplyDialog converted to typescript
@@ -118,21 +118,6 @@
   setPluginMessage(message: string): void;
 }
 
-// Copied from gr-change-actions.js
-export enum ActionType {
-  CHANGE = 'change',
-  REVISION = 'revision',
-}
-
-// Copied from gr-change-actions.js
-export enum ActionPriority {
-  CHANGE = 2,
-  DEFAULT = 0,
-  PRIMARY = 3,
-  REVIEW = -3,
-  REVISION = 1,
-}
-
 export interface GetDiffCommentsOutput {
   baseComments: CommentInfo[];
   comments: CommentInfo[];
diff --git a/polygerrit-ui/app/types/common.ts b/polygerrit-ui/app/types/common.ts
index 5f196b1..cf7e37d 100644
--- a/polygerrit-ui/app/types/common.ts
+++ b/polygerrit-ui/app/types/common.ts
@@ -198,7 +198,7 @@
   // This is not set when the change has no reviewers.
   all?: ApprovalInfo[];
   // Docs claim that 'values' is optional, but it is actually always set.
-  values: LabelValueToDescriptionMap; // A map of all values that are allowed for this label
+  values?: LabelValueToDescriptionMap; // A map of all values that are allowed for this label
   default_value?: number;
 }
 
@@ -1173,11 +1173,21 @@
   unresolved?: boolean;
   change_message_id?: string;
   commit_id?: string;
+  context_lines?: ContextLine[];
 }
 
 export type PathToCommentsInfoMap = {[path: string]: CommentInfo[]};
 
 /**
+ * The ContextLine entity contains the line number and line text of a single line of the source file content..
+ * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#context-line
+ */
+export interface ContextLine {
+  line_number: number;
+  context_line: string;
+}
+
+/**
  * The ProjectInfo entity contains information about a project
  * https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html#project-info
  */
@@ -1670,7 +1680,6 @@
   context?: number;
   expand_all_comments?: boolean;
   ignore_whitespace: IgnoreWhitespaceType;
-  intraline_difference?: boolean;
   line_length?: number;
   manual_review?: boolean;
   retain_header?: boolean;
@@ -1678,10 +1687,8 @@
   show_tabs?: boolean;
   show_whitespace_errors?: boolean;
   skip_deleted?: boolean;
-  skip_uncommented?: boolean;
   syntax_highlighting?: boolean;
   hide_top_menu?: boolean;
-  auto_hide_diff_table_header?: boolean;
   hide_line_numbers?: boolean;
   tab_size?: number;
   font_size?: number;
@@ -1756,6 +1763,7 @@
   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/types/events.ts b/polygerrit-ui/app/types/events.ts
index 163c760..6b05fad 100644
--- a/polygerrit-ui/app/types/events.ts
+++ b/polygerrit-ui/app/types/events.ts
@@ -146,6 +146,18 @@
   value?: number;
   // scroll into the tab afterwards, from custom event
   scrollIntoView?: boolean;
+  // define state of tab after opening
+  tabState?: TabState;
+}
+
+export interface TabState {
+  commentTab?: CommentTabState;
+}
+
+export enum CommentTabState {
+  UNRESOLVED = 'unresolved',
+  DRAFTS = 'drafts',
+  SHOW_ALL = 'show all',
 }
 
 export type SwitchTabEvent = CustomEvent<SwitchTabEventDetail>;
diff --git a/polygerrit-ui/app/utils/admin-nav-util.ts b/polygerrit-ui/app/utils/admin-nav-util.ts
index b144313..275f9e6 100644
--- a/polygerrit-ui/app/utils/admin-nav-util.ts
+++ b/polygerrit-ui/app/utils/admin-nav-util.ts
@@ -25,9 +25,9 @@
   AccountDetailInfo,
   AccountCapabilityInfo,
 } from '../types/common';
-import {MenuLink} from '../elements/plugins/gr-admin-api/gr-admin-api';
 import {hasOwnProperty} from './common-util';
 import {GerritView} from '../services/router/router-model';
+import {MenuLink} from '../api/admin';
 
 const ADMIN_LINKS: NavLink[] = [
   {
diff --git a/polygerrit-ui/app/utils/change-util.ts b/polygerrit-ui/app/utils/change-util.ts
index 8839be1..1228863 100644
--- a/polygerrit-ui/app/utils/change-util.ts
+++ b/polygerrit-ui/app/utils/change-util.ts
@@ -21,6 +21,7 @@
   PatchSetNum,
   ChangeInfo,
   AccountInfo,
+  RelatedChangeAndCommitInfo,
 } from '../types/common';
 import {ParsedChangeInfo} from '../types/types';
 
@@ -225,3 +226,9 @@
       (!reviewer._account_id && account.email === reviewer.email)
   );
 }
+
+export function isChangeInfo(
+  x: ChangeInfo | RelatedChangeAndCommitInfo | ParsedChangeInfo
+): x is ChangeInfo | ParsedChangeInfo {
+  return (x as ChangeInfo)._number !== undefined;
+}
diff --git a/polygerrit-ui/app/utils/comment-util.ts b/polygerrit-ui/app/utils/comment-util.ts
index d7e7595..de12a2a 100644
--- a/polygerrit-ui/app/utils/comment-util.ts
+++ b/polygerrit-ui/app/utils/comment-util.ts
@@ -24,12 +24,14 @@
   CommentRange,
   PatchRange,
   ParentPatchSetNum,
+  ContextLine,
 } from '../types/common';
 import {CommentSide, Side} from '../constants/constants';
 import {parseDate} from './date-util';
 import {LineNumber} from '../elements/diff/gr-diff/gr-diff-line';
 import {CommentIdToCommentThreadMap} from '../elements/diff/gr-comment-api/gr-comment-api';
 import {isMergeParent, getParentIndex} from './patch-set-util';
+import {DiffInfo} from '../types/diff';
 
 export interface DraftCommentProps {
   __draft?: boolean;
@@ -177,6 +179,10 @@
   return thread?.comments?.[0];
 }
 
+export function countComments(thread?: CommentThread) {
+  return thread?.comments?.length ?? 0;
+}
+
 export function isUnresolved(thread?: CommentThread): boolean {
   return !isResolved(thread);
 }
@@ -189,6 +195,14 @@
   return isDraft(getLastComment(thread));
 }
 
+export function isRobotThread(thread?: CommentThread): boolean {
+  return isRobot(getFirstComment(thread));
+}
+
+export function hasHumanReply(thread?: CommentThread): boolean {
+  return countComments(thread) > 1 && !isRobot(getLastComment(thread));
+}
+
 /**
  * Whether the given comment should be included in the base side of the
  * given patch range.
@@ -273,3 +287,34 @@
     };
   }
 }
+
+export function computeDiffFromContext(context: ContextLine[], path: string) {
+  // do not render more than 20 lines of context
+  context = context.slice(0, 20);
+  const diff: DiffInfo = {
+    meta_a: {
+      name: '',
+      content_type: '',
+      lines: 0,
+      web_links: [],
+    },
+    meta_b: {
+      name: path,
+      content_type: '',
+      lines: context.length + context?.[0].line_number,
+      web_links: [],
+    },
+    change_type: 'MODIFIED',
+    intraline_status: 'OK',
+    diff_header: [],
+    content: [
+      {
+        skip: context[0].line_number - 1,
+      },
+      {
+        b: context.map(line => line.context_line),
+      },
+    ],
+  };
+  return diff;
+}
diff --git a/polygerrit-ui/app/utils/common-util.ts b/polygerrit-ui/app/utils/common-util.ts
index ad76b79..f95105d 100644
--- a/polygerrit-ui/app/utils/common-util.ts
+++ b/polygerrit-ui/app/utils/common-util.ts
@@ -67,6 +67,18 @@
 }
 
 /**
+ * Throws an error if the property is not defined.
+ */
+export function assertIsDefined<T>(
+  val: T,
+  variableName = 'variable'
+): asserts val is NonNullable<T> {
+  if (val === undefined || val === null) {
+    throw new Error(`${variableName} is not defined`);
+  }
+}
+
+/**
  * Returns true, if both sets contain the same members.
  */
 export function areSetsEqual<T>(a: Set<T>, b: Set<T>): boolean {
diff --git a/polygerrit-ui/app/utils/event-util.ts b/polygerrit-ui/app/utils/event-util.ts
index ee3c833..cf590e0 100644
--- a/polygerrit-ui/app/utils/event-util.ts
+++ b/polygerrit-ui/app/utils/event-util.ts
@@ -17,7 +17,7 @@
 
 import {UrlEncodedCommentId} from '../types/common';
 import {FetchRequest} from '../types/types';
-import {DialogChangeEventDetail} from '../types/events';
+import {DialogChangeEventDetail, TabState} from '../types/events';
 
 export enum EventType {
   SHOW_ALERT = 'show-alert',
@@ -27,6 +27,7 @@
   TITLE_CHANGE = 'title-change',
   THREAD_LIST_MODIFIED = 'thread-list-modified',
   DIALOG_CHANGE = 'dialog-change',
+  SHOW_PRIMARY_TAB = 'show-primary-tab',
 }
 
 export function fireEvent(target: EventTarget, type: string) {
@@ -117,10 +118,15 @@
   );
 }
 
-export function fireShowPrimaryTab(target: EventTarget, tab: string) {
+export function fireShowPrimaryTab(
+  target: EventTarget,
+  tab: string,
+  scrollIntoView?: boolean,
+  tabState?: TabState
+) {
   target.dispatchEvent(
-    new CustomEvent('show-primary-tab', {
-      detail: {tab},
+    new CustomEvent(EventType.SHOW_PRIMARY_TAB, {
+      detail: {tab, scrollIntoView, tabState},
       composed: true,
       bubbles: true,
     })
diff --git a/polygerrit-ui/app/utils/label-util.ts b/polygerrit-ui/app/utils/label-util.ts
index fc83d77..60ac4d8 100644
--- a/polygerrit-ui/app/utils/label-util.ts
+++ b/polygerrit-ui/app/utils/label-util.ts
@@ -27,7 +27,7 @@
 export const CODE_REVIEW = 'Code-Review';
 
 export function getVotingRange(label?: LabelInfo): VotingRangeInfo | undefined {
-  if (!label || !isDetailedLabelInfo(label)) return undefined;
+  if (!label || !isDetailedLabelInfo(label) || !label.values) return undefined;
   const values = Object.keys(label.values).map(v => Number(v));
   values.sort((a, b) => a - b);
   if (!values.length) return undefined;
diff --git a/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy b/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
index 31ea7d2..93584c6 100644
--- a/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
+++ b/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.httpd.raw}
 
-{template .Index}
+{template Index}
   {@param canonicalPath: ?}
   {@param staticResourcePath: ?}
   {@param gerritInitialData: /** {string} map of REST endpoint to response for startup. */ ?}
diff --git a/resources/com/google/gerrit/server/mail/Abandoned.soy b/resources/com/google/gerrit/server/mail/Abandoned.soy
index d5aac0e..b57f00a 100644
--- a/resources/com/google/gerrit/server/mail/Abandoned.soy
+++ b/resources/com/google/gerrit/server/mail/Abandoned.soy
@@ -20,7 +20,7 @@
  * The .Abandoned template will determine the contents of the email related to a
  * change being abandoned.
  */
-{template .Abandoned kind="text"}
+{template Abandoned kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/AbandonedHtml.soy b/resources/com/google/gerrit/server/mail/AbandonedHtml.soy
index 9ad996e..9f80241 100644
--- a/resources/com/google/gerrit/server/mail/AbandonedHtml.soy
+++ b/resources/com/google/gerrit/server/mail/AbandonedHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .AbandonedHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template AbandonedHtml}
   {@param coverLetter: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -26,7 +28,7 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
diff --git a/resources/com/google/gerrit/server/mail/AddKey.soy b/resources/com/google/gerrit/server/mail/AddKey.soy
index 8b609cf..c77ab56 100644
--- a/resources/com/google/gerrit/server/mail/AddKey.soy
+++ b/resources/com/google/gerrit/server/mail/AddKey.soy
@@ -16,11 +16,13 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
+import * as mailTemplate from 'com/google/gerrit/server/mail/NoReplyFooter.soy';
+
 /**
  * The .AddKey template will determine the contents of the email related to
  * adding a new SSH or GPG key to an account.
  */
-{template .AddKey kind="text"}
+{template AddKey kind="text"}
   {@param email: ?}
   One or more new {$email.keyType} keys have been added to Gerrit Code Review at
   {sp}{$email.gerritHost}:
@@ -64,5 +66,5 @@
   browser window instead.
 
   {\n}
-  {call .NoReplyFooter /}
+  {call mailTemplate.NoReplyFooter /}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/AddKeyHtml.soy b/resources/com/google/gerrit/server/mail/AddKeyHtml.soy
index ed4f435..3987684 100644
--- a/resources/com/google/gerrit/server/mail/AddKeyHtml.soy
+++ b/resources/com/google/gerrit/server/mail/AddKeyHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .AddKeyHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/NoReplyFooterHtml.soy';
+
+{template AddKeyHtml}
   {@param email: ?}
   <p>
     One or more new {$email.keyType} keys have been added to Gerrit Code Review
@@ -57,5 +59,5 @@
     {/if}.
   </p>
 
-  {call .NoReplyFooterHtml /}
+  {call mailTemplate.NoReplyFooterHtml /}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/AddToAttentionSet.soy b/resources/com/google/gerrit/server/mail/AddToAttentionSet.soy
index 5ea41b2..64c1ad3 100644
--- a/resources/com/google/gerrit/server/mail/AddToAttentionSet.soy
+++ b/resources/com/google/gerrit/server/mail/AddToAttentionSet.soy
@@ -20,7 +20,7 @@
  * The .AddToAttentionSet template will determine the contents of the email related to a
  * user being added to the attention set.
  */
-{template .AddToAttentionSet kind="text"}
+{template AddToAttentionSet kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/AddToAttentionSetHtml.soy b/resources/com/google/gerrit/server/mail/AddToAttentionSetHtml.soy
index bac180a..04d759e 100644
--- a/resources/com/google/gerrit/server/mail/AddToAttentionSetHtml.soy
+++ b/resources/com/google/gerrit/server/mail/AddToAttentionSetHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .AddToAttentionSetHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template AddToAttentionSetHtml}
   {@param coverLetter: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -33,11 +35,11 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
   {if $coverLetter}
     <div style="white-space:pre-wrap">{$coverLetter}</div>
   {/if}
-{/template}
\ No newline at end of file
+{/template}
diff --git a/resources/com/google/gerrit/server/mail/ChangeFooter.soy b/resources/com/google/gerrit/server/mail/ChangeFooter.soy
index a8170ca..236b171 100644
--- a/resources/com/google/gerrit/server/mail/ChangeFooter.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeFooter.soy
@@ -20,7 +20,7 @@
  * The .ChangeFooter template will determine the contents of the footer text
  * that will be appended to ALL emails related to changes.
  */
-{template .ChangeFooter kind="text"}
+{template ChangeFooter kind="text"}
   {@param email: ?}
   --{sp}
   {\n}
diff --git a/resources/com/google/gerrit/server/mail/ChangeFooterHtml.soy b/resources/com/google/gerrit/server/mail/ChangeFooterHtml.soy
index b619c53..28442ee 100644
--- a/resources/com/google/gerrit/server/mail/ChangeFooterHtml.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeFooterHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .ChangeFooterHtml}
+{template ChangeFooterHtml}
   {@param change: ?}
   {@param email: ?}
   {if $email.changeUrl or $email.settingsUrl}
diff --git a/resources/com/google/gerrit/server/mail/ChangeHeader.soy b/resources/com/google/gerrit/server/mail/ChangeHeader.soy
index fde69f1..7a2da65 100644
--- a/resources/com/google/gerrit/server/mail/ChangeHeader.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeHeader.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .ChangeHeader kind="text"}
+{template ChangeHeader kind="text"}
   {@param attentionSet: ?}
   {if $attentionSet}
     Attention is currently required from:{sp}
diff --git a/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy b/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy
index ea12455..a1bcd8f 100644
--- a/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeHeaderHtml.soy
@@ -17,7 +17,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .ChangeHeaderHtml}
+{template ChangeHeaderHtml}
   {@param attentionSet: ?}
   {if $attentionSet}
     <p> Attention is currently required from:{sp}
diff --git a/resources/com/google/gerrit/server/mail/ChangeSubject.soy b/resources/com/google/gerrit/server/mail/ChangeSubject.soy
index 7fcd213..12422ed 100644
--- a/resources/com/google/gerrit/server/mail/ChangeSubject.soy
+++ b/resources/com/google/gerrit/server/mail/ChangeSubject.soy
@@ -20,7 +20,7 @@
  * The .ChangeSubject template will determine the contents of the email subject
  * line for ALL emails related to changes.
  */
-{template .ChangeSubject kind="text"}
+{template ChangeSubject kind="text"}
   {@param branch: ?}
   {@param change: ?}
   {@param shortProjectName: ?}
diff --git a/resources/com/google/gerrit/server/mail/Comment.soy b/resources/com/google/gerrit/server/mail/Comment.soy
index 893ef6f..973b369 100644
--- a/resources/com/google/gerrit/server/mail/Comment.soy
+++ b/resources/com/google/gerrit/server/mail/Comment.soy
@@ -20,7 +20,7 @@
  * The .Comment template will determine the contents of the email related to a
  * user submitting comments on changes.
  */
-{template .Comment kind="text"}
+{template Comment kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/CommentFooter.soy b/resources/com/google/gerrit/server/mail/CommentFooter.soy
index 3998438..3c111f7 100644
--- a/resources/com/google/gerrit/server/mail/CommentFooter.soy
+++ b/resources/com/google/gerrit/server/mail/CommentFooter.soy
@@ -21,5 +21,5 @@
  * that will be appended to emails related to a user submitting comments on
  * changes.
  */
-{template .CommentFooter kind="text"}
+{template CommentFooter kind="text"}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/CommentFooterHtml.soy b/resources/com/google/gerrit/server/mail/CommentFooterHtml.soy
index 033c1b1..ce8a933 100644
--- a/resources/com/google/gerrit/server/mail/CommentFooterHtml.soy
+++ b/resources/com/google/gerrit/server/mail/CommentFooterHtml.soy
@@ -16,5 +16,5 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .CommentFooterHtml}
+{template CommentFooterHtml}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/CommentHtml.soy b/resources/com/google/gerrit/server/mail/CommentHtml.soy
index 21fee18..b3924c3 100644
--- a/resources/com/google/gerrit/server/mail/CommentHtml.soy
+++ b/resources/com/google/gerrit/server/mail/CommentHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .CommentHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template CommentHtml}
   {@param commentFiles: ?}
   {@param commentCount: ?}
   {@param email: ?}
@@ -71,7 +73,9 @@
   {/let}
 
   {if $patchSetCommentBlocks}
-    {call .WikiFormat}{param content: $patchSetCommentBlocks /}{/call}
+    {call mailTemplate.WikiFormat}
+      {param content: $patchSetCommentBlocks /}
+    {/call}
   {/if}
 
   {if length($labels) > 0}
@@ -97,7 +101,7 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
@@ -146,11 +150,13 @@
               {if length($comment.lines) > 1}
                 <p>
                   <blockquote style="{$blockquoteStyle}">
-                    {call .Pre}{param content kind="html"}
-                      {for $line in $comment.lines}
-                        {$line}{\n}
-                      {/for}
-                    {/param}{/call}
+                    {call mailTemplate.Pre}
+                      {param content kind="html"}
+                        {for $line in $comment.lines}
+                          {$line}{\n}
+                        {/for}
+                      {/param}
+                    {/call}
                   </blockquote>
                 </p>
               {/if}
@@ -163,7 +169,9 @@
                 </p>
               {/if}
 
-              {call .WikiFormat}{param content: $comment.messageBlocks /}{/call}
+              {call mailTemplate.WikiFormat}
+                {param content: $comment.messageBlocks /}
+              {/call}
             </li>
           {/for}
         </ul>
diff --git a/resources/com/google/gerrit/server/mail/DeleteKey.soy b/resources/com/google/gerrit/server/mail/DeleteKey.soy
index 30548c8..ffc12dc 100644
--- a/resources/com/google/gerrit/server/mail/DeleteKey.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteKey.soy
@@ -20,7 +20,7 @@
  * The .DeleteKey template will determine the contents of the email related to
  * deleting a SSH or GPG key.
  */
-{template .DeleteKey kind="text"}
+{template DeleteKey kind="text"}
   {@param email: ?}
   One or more {$email.keyType} keys have been deleted on Gerrit Code Review at
   {sp}{$email.gerritHost}:
diff --git a/resources/com/google/gerrit/server/mail/DeleteKeyHtml.soy b/resources/com/google/gerrit/server/mail/DeleteKeyHtml.soy
index 1ab3955..4ce5246 100644
--- a/resources/com/google/gerrit/server/mail/DeleteKeyHtml.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteKeyHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .DeleteKeyHtml}
+{template DeleteKeyHtml}
   {@param email: ?}
   <p>
     One or more {$email.keyType} keys have been deleted on Gerrit Code Review
diff --git a/resources/com/google/gerrit/server/mail/DeleteReviewer.soy b/resources/com/google/gerrit/server/mail/DeleteReviewer.soy
index 3310249..a9ba802 100644
--- a/resources/com/google/gerrit/server/mail/DeleteReviewer.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteReviewer.soy
@@ -20,7 +20,7 @@
  * The .DeleteReviewer template will determine the contents of the email related
  * to removal of a reviewer (and the reviewer's votes) from reviews.
  */
-{template .DeleteReviewer kind="text"}
+{template DeleteReviewer kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy b/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy
index 54720fe..685ca4c 100644
--- a/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteReviewerHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .DeleteReviewerHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template DeleteReviewerHtml}
   {@param email: ?}
   {@param fromName: ?}
   <p>
@@ -35,7 +37,7 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/DeleteVote.soy b/resources/com/google/gerrit/server/mail/DeleteVote.soy
index 0ee5454..74790f7 100644
--- a/resources/com/google/gerrit/server/mail/DeleteVote.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteVote.soy
@@ -20,7 +20,7 @@
  * The .DeleteVote template will determine the contents of the email related
  * to removing votes on changes.
  */
-{template .DeleteVote kind="text"}
+{template DeleteVote kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/DeleteVoteHtml.soy b/resources/com/google/gerrit/server/mail/DeleteVoteHtml.soy
index 3a82927..dd3b423 100644
--- a/resources/com/google/gerrit/server/mail/DeleteVoteHtml.soy
+++ b/resources/com/google/gerrit/server/mail/DeleteVoteHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .DeleteVoteHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template DeleteVoteHtml}
   {@param coverLetter: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -26,7 +28,7 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
diff --git a/resources/com/google/gerrit/server/mail/Footer.soy b/resources/com/google/gerrit/server/mail/Footer.soy
index 7483cd9..6ce0d3b 100644
--- a/resources/com/google/gerrit/server/mail/Footer.soy
+++ b/resources/com/google/gerrit/server/mail/Footer.soy
@@ -21,7 +21,7 @@
  * appended to the end of all outgoing emails after the ChangeFooter and
  * CommentFooter.
  */
-{template .Footer kind="text"}
+{template Footer kind="text"}
   {@param footers: ?}
   {for $footer in $footers}
     {$footer}{\n}
diff --git a/resources/com/google/gerrit/server/mail/FooterHtml.soy b/resources/com/google/gerrit/server/mail/FooterHtml.soy
index ce934d3..c89dea7 100644
--- a/resources/com/google/gerrit/server/mail/FooterHtml.soy
+++ b/resources/com/google/gerrit/server/mail/FooterHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .FooterHtml}
+{template FooterHtml}
   {@param footers: ?}
   {\n}
   {\n}
diff --git a/resources/com/google/gerrit/server/mail/HttpPasswordUpdate.soy b/resources/com/google/gerrit/server/mail/HttpPasswordUpdate.soy
index 38e679e..08daa932 100644
--- a/resources/com/google/gerrit/server/mail/HttpPasswordUpdate.soy
+++ b/resources/com/google/gerrit/server/mail/HttpPasswordUpdate.soy
@@ -20,7 +20,7 @@
  * The .HttpPasswordUpdate template will determine the contents of the email related to
  * adding, changing or deleting the HTTP password.
  */
-{template .HttpPasswordUpdate kind="text"}
+{template HttpPasswordUpdate kind="text"}
   {@param email: ?}
   The HTTP password was {$email.operation} on Gerrit Code Review at
   {sp}{$email.gerritHost}.
diff --git a/resources/com/google/gerrit/server/mail/HttpPasswordUpdateHtml.soy b/resources/com/google/gerrit/server/mail/HttpPasswordUpdateHtml.soy
index 3c4594c..e28aaaa 100644
--- a/resources/com/google/gerrit/server/mail/HttpPasswordUpdateHtml.soy
+++ b/resources/com/google/gerrit/server/mail/HttpPasswordUpdateHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .HttpPasswordUpdateHtml}
+{template HttpPasswordUpdateHtml}
   {@param email: ?}
   <p>
     The HTTP password was {$email.operation} on Gerrit Code Review
diff --git a/resources/com/google/gerrit/server/mail/InboundEmailRejection.soy b/resources/com/google/gerrit/server/mail/InboundEmailRejection.soy
index 16c5c8d..378785a 100644
--- a/resources/com/google/gerrit/server/mail/InboundEmailRejection.soy
+++ b/resources/com/google/gerrit/server/mail/InboundEmailRejection.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .InboundEmailRejectionFooter kind="text"}
+import * as noReplyFooter from 'com/google/gerrit/server/mail/NoReplyFooter.soy';
+
+{template InboundEmailRejectionFooter kind="text"}
   {\n}
   {\n}
   Thus, no actions were taken by Gerrit in response to this email,
@@ -24,7 +26,7 @@
   {\n}
   This email was sent in response to an email coming from this address.
   In case you did not send Gerrit an email, feel free to ignore this.
-  {call .NoReplyFooter /}
+  {call noReplyFooter.NoReplyFooter /}
 {/template}
 
 /**
@@ -32,39 +34,39 @@
  * to warning users of error in inbound emails
  */
 
-{template .InboundEmailRejection_PARSING_ERROR kind="text"}
+{template InboundEmailRejection_PARSING_ERROR kind="text"}
   Gerrit Code Review was unable to parse your email.{\n}
   This might be because your email did not quote Gerrit's email,
   because you are using an unsupported email client,
   or because of a bug.
-  {call .InboundEmailRejectionFooter /}
+  {call InboundEmailRejectionFooter /}
 {/template}
 
-{template .InboundEmailRejection_UNKNOWN_ACCOUNT kind="text"}
+{template InboundEmailRejection_UNKNOWN_ACCOUNT kind="text"}
   Gerrit Code Review was unable to match your email to an account.{\n}
   This may happen if several accounts are linked to this email address.
-  {call .InboundEmailRejectionFooter /}
+  {call InboundEmailRejectionFooter /}
 {/template}
 
-{template .InboundEmailRejection_INACTIVE_ACCOUNT kind="text"}
+{template InboundEmailRejection_INACTIVE_ACCOUNT kind="text"}
   Your account on this Gerrit Code Review instance is marked as inactive,
   so your email has been ignored. {\n}
   If you think this is an error, please contact your Gerrit instance administrator.
   {\n}{\n}
   This email was sent in response to an email coming from this address.
   In case you did not send Gerrit an email, feel free to ignore this.
-  {call .NoReplyFooter /}
+  {call noReplyFooter.NoReplyFooter /}
 {/template}
 
-{template .InboundEmailRejection_INTERNAL_EXCEPTION kind="text"}
+{template InboundEmailRejection_INTERNAL_EXCEPTION kind="text"}
   Gerrit Code Review encountered an internal exception and was unable to fulfil your request.
   {\n}
   This might be caused by an ongoing maintenance or a data corruption.
-  {call .InboundEmailRejectionFooter /}
+  {call InboundEmailRejectionFooter /}
 {/template}
 
-{template .InboundEmailRejection_COMMENT_REJECTED kind="text"}
+{template InboundEmailRejection_COMMENT_REJECTED kind="text"}
   Gerrit Code Review rejected one or more comments because they did not pass validation, or
   because the maximum number of comments per change would be exceeded.
-  {call .InboundEmailRejectionFooter /}
+  {call InboundEmailRejectionFooter /}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/InboundEmailRejectionHtml.soy b/resources/com/google/gerrit/server/mail/InboundEmailRejectionHtml.soy
index 8762e10..f0b18d2 100644
--- a/resources/com/google/gerrit/server/mail/InboundEmailRejectionHtml.soy
+++ b/resources/com/google/gerrit/server/mail/InboundEmailRejectionHtml.soy
@@ -16,8 +16,11 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
+import * as noReplyFooter from 'com/google/gerrit/server/mail/NoReplyFooter.soy';
+import * as noReplyFooterHtml from 'com/google/gerrit/server/mail/NoReplyFooterHtml.soy';
 
-{template .InboundEmailRejectionFooterHtml}
+
+{template InboundEmailRejectionFooterHtml}
   <p>
     Thus, no actions were taken by Gerrit in response to this email,
     and you should use the Gerrit website to continue.
@@ -25,7 +28,7 @@
   <p>
     In case you did not send Gerrit an email, feel free to ignore this.
   </p>
-  {call .NoReplyFooterHtml /}
+  {call noReplyFooterHtml.NoReplyFooterHtml /}
 {/template}
 
 /**
@@ -33,7 +36,7 @@
  * to warning users of error in inbound emails
  */
 
-{template .InboundEmailRejectionHtml_PARSING_ERROR}
+{template InboundEmailRejectionHtml_PARSING_ERROR}
   <p>
     Gerrit Code Review was unable to parse your email.
   </p>
@@ -42,20 +45,20 @@
     because you are using an unsupported email client,
     or because of a bug.
   </p>
-  {call .InboundEmailRejectionFooterHtml /}
+  {call InboundEmailRejectionFooterHtml /}
 {/template}
 
-{template .InboundEmailRejectionHtml_UNKNOWN_ACCOUNT}
+{template InboundEmailRejectionHtml_UNKNOWN_ACCOUNT}
   <p>
     Gerrit Code Review was unable to match your email to an account.
   </p>
   <p>
     This may happen if several accounts are linked to this email address.
   </p>
-  {call .InboundEmailRejectionFooterHtml /}
+  {call InboundEmailRejectionFooterHtml /}
 {/template}
 
-{template .InboundEmailRejectionHtml_INACTIVE_ACCOUNT}
+{template InboundEmailRejectionHtml_INACTIVE_ACCOUNT}
   <p>
     Your account on this Gerrit Code Review instance is marked as inactive,
     so your email has been ignored.
@@ -66,23 +69,23 @@
   <p>
     In case you did not send Gerrit an email, feel free to ignore this.
   </p>
-  {call .NoReplyFooter /}
+  {call noReplyFooter.NoReplyFooter /}
 {/template}
 
-{template .InboundEmailRejectionHtml_INTERNAL_EXCEPTION}
+{template InboundEmailRejectionHtml_INTERNAL_EXCEPTION}
   <p>
     Gerrit Code Review encountered an internal exception and was unable to fulfil your request.
   </p>
   <p>
     This might be caused by an ongoing maintenance or a data corruption.
   <p>
-  {call .InboundEmailRejectionFooterHtml /}
+  {call InboundEmailRejectionFooterHtml /}
 {/template}
 
-{template .InboundEmailRejectionHtml_COMMENT_REJECTED}
+{template InboundEmailRejectionHtml_COMMENT_REJECTED}
   <p>
     Gerrit Code Review rejected one or more comments because they did not pass validation, or
     because the maximum number of comments per change would be exceeded.
   </p>
-  {call .InboundEmailRejectionFooterHtml /}
+  {call InboundEmailRejectionFooterHtml /}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/Merged.soy b/resources/com/google/gerrit/server/mail/Merged.soy
index 59e73eb..b586851 100644
--- a/resources/com/google/gerrit/server/mail/Merged.soy
+++ b/resources/com/google/gerrit/server/mail/Merged.soy
@@ -21,7 +21,7 @@
  * The .Merged template will determine the contents of the email related to
  * a change successfully merged to the head.
  */
-{template .Merged kind="text"}
+{template Merged kind="text"}
   {@param change: ?}
   {@param email: ?}
   {@param fromName: ?}
diff --git a/resources/com/google/gerrit/server/mail/MergedHtml.soy b/resources/com/google/gerrit/server/mail/MergedHtml.soy
index ca6451e..53c1645 100644
--- a/resources/com/google/gerrit/server/mail/MergedHtml.soy
+++ b/resources/com/google/gerrit/server/mail/MergedHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .MergedHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template MergedHtml}
   {@param diffLines: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -26,16 +28,20 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
   <div style="white-space:pre-wrap">{$email.approvals}</div>
 
-  {call .Pre}{param content: $email.changeDetail /}{/call}
+  {call mailTemplate.Pre}
+    {param content: $email.changeDetail /}
+  {/call}
 
   {if $email.includeDiff}
-    {call .UnifiedDiff}{param diffLines: $diffLines /}{/call}
+    {call mailTemplate.UnifiedDiff}
+      {param diffLines: $diffLines /}
+    {/call}
   {/if}
   <div style="white-space:pre-wrap">{$email.stickyApprovalDiff}</div>
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/NewChange.soy b/resources/com/google/gerrit/server/mail/NewChange.soy
index fa447e9..fe99ba4 100644
--- a/resources/com/google/gerrit/server/mail/NewChange.soy
+++ b/resources/com/google/gerrit/server/mail/NewChange.soy
@@ -20,7 +20,7 @@
  * The .NewChange template will determine the contents of the email related to a
  * user submitting a new change for review.
  */
-{template .NewChange kind="text"}
+{template NewChange kind="text"}
   {@param change: ?}
   {@param email: ?}
   {@param ownerName: ?}
diff --git a/resources/com/google/gerrit/server/mail/NewChangeHtml.soy b/resources/com/google/gerrit/server/mail/NewChangeHtml.soy
index e16b213..756d6ce 100644
--- a/resources/com/google/gerrit/server/mail/NewChangeHtml.soy
+++ b/resources/com/google/gerrit/server/mail/NewChangeHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .NewChangeHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template NewChangeHtml}
   {@param diffLines: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -41,20 +43,26 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
-  {call .Pre}{param content: $email.changeDetail /}{/call}
+  {call mailTemplate.Pre}
+    {param content: $email.changeDetail /}
+  {/call}
 
   {if $email.sshHost}
-    {call .Pre}{param content kind="html"}
-      git pull ssh:{print '//'}{$email.sshHost}/{$projectName}
-          {sp}{$patchSet.refName}
-    {/param}{/call}
+    {call mailTemplate.Pre}
+      {param content kind="html"}
+        git pull ssh:{print '//'}{$email.sshHost}/{$projectName}
+        {sp}{$patchSet.refName}
+      {/param}
+    {/call}
   {/if}
 
   {if $email.includeDiff}
-    {call .UnifiedDiff}{param diffLines: $diffLines /}{/call}
+    {call mailTemplate.UnifiedDiff}
+      {param diffLines: $diffLines /}
+    {/call}
   {/if}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/NoReplyFooter.soy b/resources/com/google/gerrit/server/mail/NoReplyFooter.soy
index 1443100..d309e90 100644
--- a/resources/com/google/gerrit/server/mail/NoReplyFooter.soy
+++ b/resources/com/google/gerrit/server/mail/NoReplyFooter.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .NoReplyFooter kind="text"}
+{template NoReplyFooter kind="text"}
   {\n}
   This is a send-only email address.  Replies to this message will not be read
   or answered.
diff --git a/resources/com/google/gerrit/server/mail/NoReplyFooterHtml.soy b/resources/com/google/gerrit/server/mail/NoReplyFooterHtml.soy
index 93df527..1baf5ab 100644
--- a/resources/com/google/gerrit/server/mail/NoReplyFooterHtml.soy
+++ b/resources/com/google/gerrit/server/mail/NoReplyFooterHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .NoReplyFooterHtml}
+{template NoReplyFooterHtml}
   <p>
     This is a send-only email address.  Replies to this message will not be read
     or answered.
diff --git a/resources/com/google/gerrit/server/mail/Private.soy b/resources/com/google/gerrit/server/mail/Private.soy
index 510f15e..7920c21 100644
--- a/resources/com/google/gerrit/server/mail/Private.soy
+++ b/resources/com/google/gerrit/server/mail/Private.soy
@@ -23,7 +23,7 @@
 /**
  * Private template to generate "View Change" buttons.
  */
-{template .ViewChangeButton}
+{template ViewChangeButton}
   {@param email: ?}
   <a href="{$email.changeUrl}">View Change</a>
 {/template}
@@ -31,7 +31,7 @@
 /**
  * Private template to render PRE block with consistent font-sizing.
  */
-{template .Pre}
+{template Pre}
   {@param content: ?}
   {let $preStyle kind="css"}
     font-family: monospace,monospace; // Use this to avoid browsers scaling down
@@ -54,7 +54,7 @@
  * This mechanism encodes as little structure as possible in order to depend on
  * the Soy autoescape mechanism for all of the content.
  */
-{template .WikiFormat}
+{template WikiFormat}
   {@param content: ?}
   {let $blockquoteStyle kind="css"}
     border-left: 1px solid #aaa;
@@ -72,10 +72,10 @@
       <p style="{$pStyle}">{$block.text|changeNewlineToBr}</p>
     {elseif $block.type == 'quote'}
       <blockquote style="{$blockquoteStyle}">
-        {call .WikiFormat}{param content: $block.quotedBlocks /}{/call}
+        {call WikiFormat}{param content: $block.quotedBlocks /}{/call}
       </blockquote>
     {elseif $block.type == 'pre'}
-      {call .Pre}{param content: $block.text /}{/call}
+      {call Pre}{param content: $block.text /}{/call}
     {elseif $block.type == 'list'}
       <ul>
         {for $item in $block.items}
@@ -86,7 +86,7 @@
   {/for}
 {/template}
 
-{template .UnifiedDiff}
+{template UnifiedDiff}
   {@param diffLines: ?}
   {let $addStyle kind="css"}
     color: hsl(120, 100%, 40%);
diff --git a/resources/com/google/gerrit/server/mail/RegisterNewEmail.soy b/resources/com/google/gerrit/server/mail/RegisterNewEmail.soy
index ee03de0..bde8152 100644
--- a/resources/com/google/gerrit/server/mail/RegisterNewEmail.soy
+++ b/resources/com/google/gerrit/server/mail/RegisterNewEmail.soy
@@ -20,7 +20,7 @@
  * The .RegisterNewEmail template will determine the contents of the email
  * related to registering new email accounts.
  */
-{template .RegisterNewEmail kind="text"}
+{template RegisterNewEmail kind="text"}
   {@param email: ?}
   Welcome to Gerrit Code Review at {$email.gerritHost}.{\n}
 
diff --git a/resources/com/google/gerrit/server/mail/RegisterNewEmailHtml.soy b/resources/com/google/gerrit/server/mail/RegisterNewEmailHtml.soy
index 033d145..e3ec3a5 100644
--- a/resources/com/google/gerrit/server/mail/RegisterNewEmailHtml.soy
+++ b/resources/com/google/gerrit/server/mail/RegisterNewEmailHtml.soy
@@ -16,7 +16,7 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .RegisterNewEmailHtml}
+{template RegisterNewEmailHtml}
   {@param email: ?}
   <p>
     Welcome to Gerrit Code Review at {$email.gerritHost}.
diff --git a/resources/com/google/gerrit/server/mail/RemoveFromAttentionSet.soy b/resources/com/google/gerrit/server/mail/RemoveFromAttentionSet.soy
index f116adb..a329f7b0 100644
--- a/resources/com/google/gerrit/server/mail/RemoveFromAttentionSet.soy
+++ b/resources/com/google/gerrit/server/mail/RemoveFromAttentionSet.soy
@@ -20,7 +20,7 @@
  * The .RemoveFromAttentionSet template will determine the contents of the email related to a
  * user being added to the attention set.
  */
-{template .RemoveFromAttentionSet kind="text"}
+{template RemoveFromAttentionSet kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/RemoveFromAttentionSetHtml.soy b/resources/com/google/gerrit/server/mail/RemoveFromAttentionSetHtml.soy
index 55eef13..c1c6185 100644
--- a/resources/com/google/gerrit/server/mail/RemoveFromAttentionSetHtml.soy
+++ b/resources/com/google/gerrit/server/mail/RemoveFromAttentionSetHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .RemoveFromAttentionSetHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template RemoveFromAttentionSetHtml}
   {@param coverLetter: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -33,11 +35,11 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
   {if $coverLetter}
     <div style="white-space:pre-wrap">{$coverLetter}</div>
   {/if}
-{/template}
\ No newline at end of file
+{/template}
diff --git a/resources/com/google/gerrit/server/mail/ReplacePatchSet.soy b/resources/com/google/gerrit/server/mail/ReplacePatchSet.soy
index bb84cf1..6dffa6b 100644
--- a/resources/com/google/gerrit/server/mail/ReplacePatchSet.soy
+++ b/resources/com/google/gerrit/server/mail/ReplacePatchSet.soy
@@ -20,7 +20,7 @@
  * The .ReplacePatchSet template will determine the contents of the email
  * related to a user submitting a new patchset for a change.
  */
-{template .ReplacePatchSet kind="text"}
+{template ReplacePatchSet kind="text"}
   {@param change: ?}
   {@param email: ?}
   {@param fromEmail: ?}
diff --git a/resources/com/google/gerrit/server/mail/ReplacePatchSetHtml.soy b/resources/com/google/gerrit/server/mail/ReplacePatchSetHtml.soy
index 96cba5f..57c6db6 100644
--- a/resources/com/google/gerrit/server/mail/ReplacePatchSetHtml.soy
+++ b/resources/com/google/gerrit/server/mail/ReplacePatchSetHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .ReplacePatchSetHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template ReplacePatchSetHtml}
   {@param change: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -35,16 +37,20 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
-  {call .Pre}{param content: $email.changeDetail /}{/call}
+  {call mailTemplate.Pre}
+    {param content: $email.changeDetail /}
+  {/call}
 
   {if $email.sshHost}
-    {call .Pre}{param content kind="html"}
-      git pull ssh:{print '//'}{$email.sshHost}/{$projectName}{sp}
-          {$patchSet.refName}
-    {/param}{/call}
+    {call mailTemplate.Pre}
+      {param content kind="html"}
+        git pull ssh:{print '//'}{$email.sshHost}/{$projectName}{sp}
+        {$patchSet.refName}
+      {/param}
+    {/call}
   {/if}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/Restored.soy b/resources/com/google/gerrit/server/mail/Restored.soy
index 0ec65b30..e09f95f 100644
--- a/resources/com/google/gerrit/server/mail/Restored.soy
+++ b/resources/com/google/gerrit/server/mail/Restored.soy
@@ -20,7 +20,7 @@
  * The .Restored template will determine the contents of the email related to a
  * change being restored.
  */
-{template .Restored kind="text"}
+{template Restored kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/RestoredHtml.soy b/resources/com/google/gerrit/server/mail/RestoredHtml.soy
index bcd358f..19c4b99 100644
--- a/resources/com/google/gerrit/server/mail/RestoredHtml.soy
+++ b/resources/com/google/gerrit/server/mail/RestoredHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .RestoredHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template RestoredHtml}
   {@param email: ?}
   {@param fromName: ?}
   <p>
@@ -25,7 +27,7 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/Reverted.soy b/resources/com/google/gerrit/server/mail/Reverted.soy
index 32a65c6..bdfd0ad 100644
--- a/resources/com/google/gerrit/server/mail/Reverted.soy
+++ b/resources/com/google/gerrit/server/mail/Reverted.soy
@@ -20,7 +20,7 @@
  * The .Reverted template will determine the contents of the email related
  * to a change being reverted.
  */
-{template .Reverted kind="text"}
+{template Reverted kind="text"}
   {@param change: ?}
   {@param coverLetter: ?}
   {@param email: ?}
diff --git a/resources/com/google/gerrit/server/mail/RevertedHtml.soy b/resources/com/google/gerrit/server/mail/RevertedHtml.soy
index 69260ad..d7b60df 100644
--- a/resources/com/google/gerrit/server/mail/RevertedHtml.soy
+++ b/resources/com/google/gerrit/server/mail/RevertedHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .RevertedHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template RevertedHtml}
   {@param email: ?}
   {@param fromName: ?}
   <p>
@@ -25,7 +27,7 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 {/template}
diff --git a/resources/com/google/gerrit/server/mail/SetAssignee.soy b/resources/com/google/gerrit/server/mail/SetAssignee.soy
index 1fdf690..5e83cfb 100644
--- a/resources/com/google/gerrit/server/mail/SetAssignee.soy
+++ b/resources/com/google/gerrit/server/mail/SetAssignee.soy
@@ -20,7 +20,7 @@
  * The .SetAssignee template will determine the contents of the email related
  * to a user being assigned to a change.
  */
-{template .SetAssignee kind="text"}
+{template SetAssignee kind="text"}
   {@param change: ?}
   {@param email: ?}
   {@param fromName: ?}
diff --git a/resources/com/google/gerrit/server/mail/SetAssigneeHtml.soy b/resources/com/google/gerrit/server/mail/SetAssigneeHtml.soy
index 1826314..4ff6cc1 100644
--- a/resources/com/google/gerrit/server/mail/SetAssigneeHtml.soy
+++ b/resources/com/google/gerrit/server/mail/SetAssigneeHtml.soy
@@ -16,7 +16,9 @@
 
 {namespace com.google.gerrit.server.mail.template}
 
-{template .SetAssigneeHtml}
+import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';
+
+{template SetAssigneeHtml}
   {@param diffLines: ?}
   {@param email: ?}
   {@param fromName: ?}
@@ -29,20 +31,26 @@
 
   {if $email.changeUrl}
     <p>
-      {call .ViewChangeButton data="all" /}
+      {call mailTemplate.ViewChangeButton data="all" /}
     </p>
   {/if}
 
-  {call .Pre}{param content: $email.changeDetail /}{/call}
+  {call mailTemplate.Pre}
+    {param content: $email.changeDetail /}
+  {/call}
 
   {if $email.sshHost}
-    {call .Pre}{param content kind="html"}
-      git pull ssh:{print '//'}{$email.sshHost}/{$projectName}
-          {sp}{$patchSet.refName}
-    {/param}{/call}
+    {call mailTemplate.Pre}
+      {param content kind="html"}
+        git pull ssh:{print '//'}{$email.sshHost}/{$projectName}
+        {sp}{$patchSet.refName}
+      {/param}
+    {/call}
   {/if}
 
   {if $email.includeDiff}
-    {call .UnifiedDiff}{param diffLines: $diffLines /}{/call}
+    {call mailTemplate.UnifiedDiff}
+      {param diffLines: $diffLines /}
+    {/call}
   {/if}
 {/template}
diff --git a/tools/maven/gerrit-acceptance-framework_pom.xml b/tools/maven/gerrit-acceptance-framework_pom.xml
index f6d1e3b..718f8d0 100644
--- a/tools/maven/gerrit-acceptance-framework_pom.xml
+++ b/tools/maven/gerrit-acceptance-framework_pom.xml
@@ -41,6 +41,9 @@
       <name>Edwin Kempin</name>
     </developer>
     <developer>
+      <name>Gal Paikin</name>
+    </developer>
+    <developer>
       <name>Han-Wen Nienhuys</name>
     </developer>
     <developer>
@@ -50,6 +53,9 @@
       <name>Jacek Centkowski</name>
     </developer>
     <developer>
+      <name>Joerg Zieren</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
@@ -62,6 +68,9 @@
       <name>Matthias Sohn</name>
     </developer>
     <developer>
+      <name>Milutin Kristofic</name>
+    </developer>
+    <developer>
       <name>Nasser Grainawi</name>
     </developer>
     <developer>
diff --git a/tools/maven/gerrit-extension-api_pom.xml b/tools/maven/gerrit-extension-api_pom.xml
index daf8089..a415f24 100644
--- a/tools/maven/gerrit-extension-api_pom.xml
+++ b/tools/maven/gerrit-extension-api_pom.xml
@@ -41,6 +41,9 @@
       <name>Edwin Kempin</name>
     </developer>
     <developer>
+      <name>Gal Paikin</name>
+    </developer>
+    <developer>
       <name>Han-Wen Nienhuys</name>
     </developer>
     <developer>
@@ -50,6 +53,9 @@
       <name>Jacek Centkowski</name>
     </developer>
     <developer>
+      <name>Joerg Zieren</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
@@ -62,6 +68,9 @@
       <name>Matthias Sohn</name>
     </developer>
     <developer>
+      <name>Milutin Kristofic</name>
+    </developer>
+    <developer>
       <name>Nasser Grainawi</name>
     </developer>
     <developer>
diff --git a/tools/maven/gerrit-plugin-api_pom.xml b/tools/maven/gerrit-plugin-api_pom.xml
index 07895a4..5e58fdd 100644
--- a/tools/maven/gerrit-plugin-api_pom.xml
+++ b/tools/maven/gerrit-plugin-api_pom.xml
@@ -41,6 +41,9 @@
       <name>Edwin Kempin</name>
     </developer>
     <developer>
+      <name>Gal Paikin</name>
+    </developer>
+    <developer>
       <name>Han-Wen Nienhuys</name>
     </developer>
     <developer>
@@ -50,6 +53,9 @@
       <name>Jacek Centkowski</name>
     </developer>
     <developer>
+      <name>Joerg Zieren</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
@@ -62,6 +68,9 @@
       <name>Matthias Sohn</name>
     </developer>
     <developer>
+      <name>Milutin Kristofic</name>
+    </developer>
+    <developer>
       <name>Nasser Grainawi</name>
     </developer>
     <developer>
diff --git a/tools/maven/gerrit-war_pom.xml b/tools/maven/gerrit-war_pom.xml
index a28adea..3b3a055 100644
--- a/tools/maven/gerrit-war_pom.xml
+++ b/tools/maven/gerrit-war_pom.xml
@@ -41,6 +41,9 @@
       <name>Edwin Kempin</name>
     </developer>
     <developer>
+      <name>Gal Paikin</name>
+    </developer>
+    <developer>
       <name>Han-Wen Nienhuys</name>
     </developer>
     <developer>
@@ -50,6 +53,9 @@
       <name>Jacek Centkowski</name>
     </developer>
     <developer>
+      <name>Joerg Zieren</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
@@ -62,6 +68,9 @@
       <name>Matthias Sohn</name>
     </developer>
     <developer>
+      <name>Milutin Kristofic</name>
+    </developer>
+    <developer>
       <name>Nasser Grainawi</name>
     </developer>
     <developer>
diff --git a/tools/nongoogle.bzl b/tools/nongoogle.bzl
index e8f12c8..3f5ef20 100644
--- a/tools/nongoogle.bzl
+++ b/tools/nongoogle.bzl
@@ -164,8 +164,8 @@
     # Keep this version of Soy synchronized with the version used in Gitiles.
     maven_jar(
         name = "soy",
-        artifact = "com.google.template:soy:2019-10-08",
-        sha1 = "4518bf8bac2dbbed684849bc209c39c4cb546237",
+        artifact = "com.google.template:soy:2021-02-01",
+        sha1 = "8e833744832ba88059205a1e30e0898f925d8cb5",
     )
 
     # Test-only dependencies below.