diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 77979a7..91fe24b 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -3397,7 +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
@@ -3412,9 +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-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/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/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/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/TagSet.java b/java/com/google/gerrit/server/git/TagSet.java
index 43483bf..d6220a2 100644
--- a/java/com/google/gerrit/server/git/TagSet.java
+++ b/java/com/google/gerrit/server/git/TagSet.java
@@ -16,9 +16,9 @@
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Maps;
 import com.google.common.flogger.FluentLogger;
-import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.server.cache.proto.Cache.TagSetHolderProto.TagSetProto;
@@ -37,6 +37,7 @@
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectIdOwnerMap;
 import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.RefDatabase;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevSort;
@@ -44,6 +45,12 @@
 
 class TagSet {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
+  private static final ImmutableSet<String> SKIPPABLE_REF_PREFIXES =
+      ImmutableSet.of(
+          RefNames.REFS_CHANGES,
+          RefNames.REFS_CACHE_AUTOMERGE,
+          RefNames.REFS_DRAFT_COMMENTS,
+          RefNames.REFS_STARRED_CHANGES);
 
   private final Project.NameKey projectName;
   private final Map<String, CachedRef> refs;
@@ -179,7 +186,9 @@
 
     try (TagWalk rw = new TagWalk(git)) {
       rw.setRetainBody(false);
-      for (Ref ref : git.getRefDatabase().getRefs()) {
+      for (Ref ref :
+          git.getRefDatabase()
+              .getRefsByPrefixWithExclusions(RefDatabase.ALL, SKIPPABLE_REF_PREFIXES)) {
         if (skip(ref)) {
           continue;
 
@@ -365,9 +374,7 @@
   static boolean skip(Ref ref) {
     return ref.isSymbolic()
         || ref.getObjectId() == null
-        || PatchSet.isChangeRef(ref.getName())
-        || RefNames.isNoteDbMetaRef(ref.getName())
-        || ref.getName().startsWith(RefNames.REFS_CACHE_AUTOMERGE);
+        || SKIPPABLE_REF_PREFIXES.stream().anyMatch(p -> ref.getName().startsWith(p));
   }
 
   private static boolean isTag(Ref ref) {
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 87a43c0..8b90531 100644
--- a/java/com/google/gerrit/server/patch/DiffOperations.java
+++ b/java/com/google/gerrit/server/patch/DiffOperations.java
@@ -74,7 +74,8 @@
   /**
    * 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.
@@ -96,7 +97,9 @@
 
   /**
    * 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.
diff --git a/java/com/google/gerrit/server/patch/DiffOperationsImpl.java b/java/com/google/gerrit/server/patch/DiffOperationsImpl.java
index 45ba789..16bd135 100644
--- a/java/com/google/gerrit/server/patch/DiffOperationsImpl.java
+++ b/java/com/google/gerrit/server/patch/DiffOperationsImpl.java
@@ -124,7 +124,8 @@
       DiffParameters diffParams = computeDiffParameters(project, newCommit, parent);
       FileDiffCacheKey key =
           createFileDiffCacheKey(project, diffParams.baseCommit(), newCommit, fileName, whitespace);
-      return getModifiedFilesForKeys(ImmutableList.of(key)).get(fileName);
+      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);
@@ -141,7 +142,8 @@
       throws DiffNotAvailableException {
     FileDiffCacheKey key =
         createFileDiffCacheKey(project, oldCommit, newCommit, fileName, whitespace);
-    return getModifiedFilesForKeys(ImmutableList.of(key)).get(fileName);
+    Map<String, FileDiffOutput> result = getModifiedFilesForKeys(ImmutableList.of(key));
+    return result.containsKey(fileName) ? result.get(fileName) : FileDiffOutput.empty(fileName);
   }
 
   private Map<String, FileDiffOutput> getModifiedFiles(
diff --git a/java/com/google/gerrit/server/patch/filediff/FileDiffCacheImpl.java b/java/com/google/gerrit/server/patch/filediff/FileDiffCacheImpl.java
index fb2aa3d..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
@@ -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/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/PostReview.java b/java/com/google/gerrit/server/restapi/change/PostReview.java
index a360510..562bdf8 100644
--- a/java/com/google/gerrit/server/restapi/change/PostReview.java
+++ b/java/com/google/gerrit/server/restapi/change/PostReview.java
@@ -1272,28 +1272,27 @@
             del.add(c);
             update.putApproval(normName, (short) 0);
           }
-        } else if (c != null) {
-          // Check if the label exists in the request input (the user voted again). If the user
-          // hadn't voted again, there is no need to re-apply the vote.
-          if (inLabels.keySet().contains(c.label())) {
-            PatchSetApproval.Builder b =
-                c.toBuilder()
-                    .value(ent.getValue())
-                    .granted(ctx.getWhen())
-                    .tag(Optional.ofNullable(in.tag));
-            ctx.getUser().updateRealAccountId(b::realAccountId);
-            c = b.build();
-            ups.add(c);
-            addLabelDelta(normName, c.value());
-            oldApprovals.put(normName, previous.get(normName));
-            approvals.put(normName, c.value());
-            update.putApproval(normName, ent.getValue());
-          } else {
-            current.put(normName, c);
-            oldApprovals.put(normName, null);
-            approvals.put(normName, c.value());
-          }
-        } else {
+          // Only allow voting again if the vote is copied over from a past patch-set, or the
+          // values are different.
+        } else if (c != null
+            && (c.value() != ent.getValue() || isApprovalCopiedOver(c, ctx.getNotes()))) {
+          PatchSetApproval.Builder b =
+              c.toBuilder()
+                  .value(ent.getValue())
+                  .granted(ctx.getWhen())
+                  .tag(Optional.ofNullable(in.tag));
+          ctx.getUser().updateRealAccountId(b::realAccountId);
+          c = b.build();
+          ups.add(c);
+          addLabelDelta(normName, c.value());
+          oldApprovals.put(normName, previous.get(normName));
+          approvals.put(normName, c.value());
+          update.putApproval(normName, ent.getValue());
+        } else if (c != null && c.value() == ent.getValue()) {
+          current.put(normName, c);
+          oldApprovals.put(normName, null);
+          approvals.put(normName, c.value());
+        } else if (c == null) {
           c =
               ApprovalsUtil.newApproval(psId, user, lt.getLabelId(), ent.getValue(), ctx.getWhen())
                   .tag(Optional.ofNullable(in.tag))
@@ -1319,6 +1318,17 @@
       return !del.isEmpty() || !ups.isEmpty();
     }
 
+    /**
+     * Approval is copied over if it doesn't exist in the approvals of the current patch-set
+     * according to change notes (which means it was computed in {@link
+     * com.google.gerrit.server.ApprovalInference})
+     */
+    private boolean isApprovalCopiedOver(
+        PatchSetApproval patchSetApproval, ChangeNotes changeNotes) {
+      return !changeNotes.getApprovals().get(changeNotes.getChange().currentPatchSetId()).stream()
+          .anyMatch(p -> p.equals(patchSetApproval));
+    }
+
     private void validatePostSubmitLabels(
         ChangeContext ctx,
         LabelTypes labelTypes,
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/change/PostReviewIT.java b/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
index 0b2e0f7..c8b1715 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
@@ -63,7 +63,6 @@
 import com.google.gerrit.server.restapi.change.OnPostReview;
 import com.google.gerrit.server.restapi.change.PostReview;
 import com.google.gerrit.server.update.CommentsRejectedException;
-import com.google.gerrit.testing.FakeEmailSender;
 import com.google.gerrit.testing.TestCommentHelper;
 import com.google.inject.Inject;
 import com.google.inject.Module;
@@ -597,7 +596,7 @@
       input = new ReviewInput().label(LabelId.CODE_REVIEW, 2);
       gApi.changes().id(r.getChangeId()).current().review(input);
       testOnPostReview.assertApproval(
-          LabelId.CODE_REVIEW, /* expectedOldValue= */ 2, /* expectedNewValue= */ 2);
+          LabelId.CODE_REVIEW, /* expectedOldValue= */ null, /* expectedNewValue= */ 2);
 
       // Delete the vote.
       input = new ReviewInput().label(LabelId.CODE_REVIEW, 0);
@@ -627,21 +626,19 @@
     assertThat(r.getChange().approvals().values()).hasSize(1);
     List<ChangeMessageInfo> changeMessages = gApi.changes().id(r.getChangeId()).messages();
 
-    // The two latest change messages are both about Code-Review+2
+    // Only the last change message is about Code-Review+2
     assertThat(Iterables.getLast(changeMessages).message).isEqualTo("Patch Set 1: Code-Review+2");
     changeMessages.remove(changeMessages.size() - 1);
-    assertThat(Iterables.getLast(changeMessages).message).isEqualTo("Patch Set 1: Code-Review+2");
+    assertThat(Iterables.getLast(changeMessages).message)
+        .isNotEqualTo("Patch Set 1: Code-Review+2");
 
-    // The two latest emails are about Code-Review +2.
-    List<FakeEmailSender.Message> messages = sender.getMessages();
-    assertThat(messages).hasSize(2);
-    for (FakeEmailSender.Message message : messages) {
-      assertThat(message.body()).contains("Patch Set 1: Code-Review+2");
-    }
+    // Only one email is about Code-Review +2 was sent.
+    assertThat(Iterables.getOnlyElement(sender.getMessages()).body())
+        .contains("Patch Set 1: Code-Review+2");
   }
 
   @Test
-  public void votingTheSameVoteSecondTimeExtendsOnPostReview() throws Exception {
+  public void votingTheSameVoteSecondTimeExtendsOnPostReviewWithOldNullValue() throws Exception {
     PushOneCommit.Result r = createChange();
 
     // Add a new vote.
@@ -656,12 +653,12 @@
       gApi.changes().id(r.getChangeId()).current().review(input);
 
       testOnPostReview.assertApproval(
-          LabelId.CODE_REVIEW, /* expectedOldValue= */ 2, /* expectedNewValue= */ 2);
+          LabelId.CODE_REVIEW, /* expectedOldValue= */ null, /* expectedNewValue= */ 2);
     }
   }
 
   @Test
-  public void votingTheSameVoteSecondTimeFiresOnCommentAdded() throws Exception {
+  public void votingTheSameVoteSecondTimeDoesNotFireOnCommentAdded() throws Exception {
     PushOneCommit.Result r = createChange();
 
     // Add a new vote.
@@ -675,8 +672,8 @@
       input = new ReviewInput().label(LabelId.CODE_REVIEW, 2);
       gApi.changes().id(r.getChangeId()).current().review(input);
 
-      assertThat(testListener.lastCommentAddedEvent.getComment())
-          .isEqualTo("Patch Set 1: Code-Review+2");
+      // Event not fired.
+      assertThat(testListener.lastCommentAddedEvent).isNull();
     }
   }
 
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java b/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
index 67e62dd..abfd7896 100644
--- a/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
@@ -176,12 +176,12 @@
     assertThat(approval.postSubmit).isNull();
     assertPermitted(gApi.changes().id(changeId).get(DETAILED_LABELS), LabelId.CODE_REVIEW, 1, 2);
 
-    // Repeating the current label is allowed. Flips the postSubmit since technically this is a
-    // new vote.
+    // Repeating the current label is allowed. Does not flip the postSubmit bit due to
+    // deduplication codepath.
     gApi.changes().id(changeId).current().review(ReviewInput.recommend());
     approval = getApproval(changeId, label);
     assertThat(approval.value).isEqualTo(1);
-    assertThat(approval.postSubmit).isTrue();
+    assertThat(approval.postSubmit).isNull();
 
     // Reducing vote is not allowed.
     ResourceConflictException thrown =
@@ -193,7 +193,7 @@
         .isEqualTo("Cannot reduce vote on labels for closed change: Code-Review");
     approval = getApproval(changeId, label);
     assertThat(approval.value).isEqualTo(1);
-    assertThat(approval.postSubmit).isTrue();
+    assertThat(approval.postSubmit).isNull();
 
     // Increasing vote is allowed.
     gApi.changes().id(changeId).current().review(ReviewInput.approve());
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/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/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/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/notedb/ChangeNotesStateTest.java b/javatests/com/google/gerrit/server/notedb/ChangeNotesStateTest.java
index 67181b7..78804a7 100644
--- a/javatests/com/google/gerrit/server/notedb/ChangeNotesStateTest.java
+++ b/javatests/com/google/gerrit/server/notedb/ChangeNotesStateTest.java
@@ -1013,60 +1013,6 @@
                 .build());
   }
 
-  /* Transitional test. Remove once follow-up change is live without accidents. */
-  @Test
-  public void binaryCompatibility() throws Exception {
-    ChangeNotesState.Builder builder = newBuilder();
-    PatchSet ps1 =
-        PatchSet.builder()
-            .id(PatchSet.id(ID, 1))
-            .commitId(ObjectId.fromString("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"))
-            .uploader(Account.id(2000))
-            .createdOn(cols.createdOn())
-            .build();
-    PatchSetApproval a1 =
-        PatchSetApproval.builder()
-            .key(
-                PatchSetApproval.key(
-                    ps1.id(), Account.id(2001), LabelId.create(LabelId.CODE_REVIEW)))
-            .value(1)
-            .granted(new Timestamp(1212L))
-            .build();
-
-    ChangeMessage m1 =
-        new ChangeMessage(
-            ChangeMessage.key(ID, "uuid1"),
-            Account.id(1000),
-            new Timestamp(1212L),
-            PatchSet.id(ID, 1));
-    ChangeNotesState state =
-        builder
-            .approvals(ImmutableMap.of(PatchSet.id(ID, 1), a1).entrySet())
-            .patchSets(ImmutableMap.of(ps1.id(), ps1).entrySet())
-            .changeMessages(ImmutableList.of(m1))
-            .build();
-
-    byte got[] = ChangeNotesState.Serializer.INSTANCE.serialize(state);
-    byte want[] =
-        new byte[] {
-          10, 20, 18, 52, 86, 120, 18, 52, 86, 120, 18, 52, 86, 120, 18, 52, 86, 120, 18, 52, 86,
-          120, 16, 123, 26, 89, 10, 41, 73, 97, 98, 99, 100, 97, 98, 99, 100, 97, 98, 99, 100, 97,
-          98, 99, 100, 97, 98, 99, 100, 97, 98, 99, 100, 97, 98, 99, 100, 97, 98, 99, 100, 97, 98,
-          99, 100, 97, 98, 99, 100, 16, -64, -60, 7, 24, -57, -88, 14, 32, -24, 7, 42, 17, 114, 101,
-          102, 115, 47, 104, 101, 97, 100, 115, 47, 109, 97, 115, 116, 101, 114, 66, 11, 84, 101,
-          115, 116, 32, 99, 104, 97, 110, 103, 101, -88, 1, 1, 50, 66, 10, 6, 10, 2, 8, 123, 16, 1,
-          18, 42, 10, 40, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97,
-          97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97, 97,
-          26, 3, 8, -48, 15, 33, 64, -30, 1, 0, 0, 0, 0, 0, 58, 43, 10, 28, 10, 6, 10, 2, 8, 123,
-          16, 1, 18, 3, 8, -47, 15, 26, 13, 10, 11, 67, 111, 100, 101, 45, 82, 101, 118, 105, 101,
-          119, 16, 1, 25, -68, 4, 0, 0, 0, 0, 0, 0, 64, 0, 122, 35, 10, 11, 10, 2, 8, 123, 18, 5,
-          117, 117, 105, 100, 49, 18, 3, 8, -24, 7, 25, -68, 4, 0, 0, 0, 0, 0, 0, 42, 6, 10, 2, 8,
-          123, 16, 1
-        };
-
-    assertThat(got).isEqualTo(want);
-  }
-
   @Test
   public void commentFields() throws Exception {
     assertThatSerializedClass(Comment.Key.class)
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"]]
 ;for(const n of a)if(n&&(n(e,r),r.ignore))return b(t)
 ;return n&&n.endSameAsBegin&&(n.endRe=RegExp(t.replace(/[-/\\^$*+?.()|[\]{}]/g,"\\$&"),"m")),
-n.skip?O+=t:(n.excludeBegin&&(O+=t),
-d(),n.returnBegin||n.excludeBegin||(O=t)),h(n),n.returnBegin?0:t.length}(n)
+n.skip?M+=t:(n.excludeBegin&&(M+=t),
+d(),n.returnBegin||n.excludeBegin||(M=t)),h(n),n.returnBegin?0:t.length}(n)
 ;if("illegal"===n.type&&!r){
-const e=Error('Illegal lexeme "'+a+'" for mode "'+(_.className||"<unnamed>")+'"')
-;throw e.mode=_,e}if("end"===n.type){const e=x(n);if(e!==K)return e}
+const e=Error('Illegal lexeme "'+a+'" for mode "'+(R.className||"<unnamed>")+'"')
+;throw e.mode=R,e}if("end"===n.type){const e=x(n);if(e!==G)return e}
 if("illegal"===n.type&&""===a)return 1
 ;if(B>1e5&&B>3*n.index)throw Error("potential infinite loop, way more iterations than matches")
-;return O+=a,a.length}const w=N(e)
-;if(!w)throw C(l.replace("{}",e)),Error('Unknown language: "'+e+'"')
-;const R=I(w,{plugins:a});let y="",_=o||R;const k={},M=new g.__emitter(g);(()=>{
-const e=[];for(let t=_;t!==w;t=t.parent)t.className&&e.unshift(t.className)
-;e.forEach((e=>M.openNode(e)))})();let O="",A=0,L=0,B=0,T=!1;try{
-for(_.matcher.considerAll();;){
-B++,T?T=!1:_.matcher.considerAll(),_.matcher.lastIndex=L
-;const e=_.matcher.exec(c);if(!e)break;const t=v(c.substring(L,e.index),e)
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+}return t=>{const n=(t=>{const n=t.COMMENT("//","$",{contains:[{begin:/\\\n/}]
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+variants:[{begin:'(u8?|U|L)?"',end:'"',illegal:"\\n",
+contains:[t.BACKSLASH_ESCAPE]},{
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+end:"'",illegal:"."},t.END_SAME_AS_BEGIN({
+begin:/(?:u8?|U|L)?R"([^()\\ ]{0,16})\(/,end:/\)([^()\\ ]{0,16})"/})]},c={
+className:"number",variants:[{begin:"\\b(0b[01']+)"},{
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+},{
+begin:"(-?)(\\b0[xX][a-fA-F0-9']+|(\\b[\\d']+(\\.[\\d']*)?|\\.[\\d']+)([eE][-+]?[\\d']+)?)"
+}],relevance:0},o={className:"meta",begin:/#\s*[a-z]+\b/,end:/$/,keywords:{
+"meta-keyword":"if else elif endif define undef warning error line pragma _Pragma ifdef ifndef include"
+},contains:[{begin:/\\\n/,relevance:0},t.inherit(i,{className:"meta-string"}),{
+className:"meta-string",begin:/<.*?>/,end:/$/,illegal:"\\n"
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collision_ellipse_list collision_line_list instance_position_list instance_place_list point_in_rectangle point_in_triangle point_in_circle rectangle_in_rectangle rectangle_in_triangle rectangle_in_circle instance_find instance_exists instance_number instance_position instance_nearest instance_furthest instance_place instance_create_depth instance_create_layer instance_copy instance_change instance_destroy position_destroy position_change instance_id_get instance_deactivate_all instance_deactivate_object instance_deactivate_region instance_activate_all instance_activate_object instance_activate_region room_goto room_goto_previous room_goto_next room_previous room_next room_restart game_end game_restart game_load game_save game_save_buffer game_load_buffer event_perform event_user event_perform_object event_inherited show_debug_message show_debug_overlay debug_event debug_get_callstack alarm_get alarm_set font_texture_page_size keyboard_set_map keyboard_get_map keyboard_unset_map keyboard_check keyboard_check_pressed keyboard_check_released keyboard_check_direct keyboard_get_numlock keyboard_set_numlock keyboard_key_press keyboard_key_release keyboard_clear io_clear mouse_check_button mouse_check_button_pressed mouse_check_button_released mouse_wheel_up mouse_wheel_down mouse_clear draw_self draw_sprite draw_sprite_pos draw_sprite_ext draw_sprite_stretched draw_sprite_stretched_ext draw_sprite_tiled draw_sprite_tiled_ext draw_sprite_part draw_sprite_part_ext draw_sprite_general draw_clear draw_clear_alpha draw_point draw_line draw_line_width draw_rectangle draw_roundrect draw_roundrect_ext draw_triangle draw_circle draw_ellipse draw_set_circle_precision draw_arrow draw_button draw_path draw_healthbar draw_getpixel draw_getpixel_ext draw_set_colour draw_set_color draw_set_alpha draw_get_colour draw_get_color draw_get_alpha merge_colour make_colour_rgb make_colour_hsv colour_get_red colour_get_green colour_get_blue colour_get_hue colour_get_saturation 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display_get_gui_width display_get_gui_height display_reset display_mouse_get_x display_mouse_get_y display_mouse_set display_set_ui_visibility window_set_fullscreen window_get_fullscreen window_set_caption window_set_min_width window_set_max_width window_set_min_height window_set_max_height window_get_visible_rects window_get_caption window_set_cursor window_get_cursor window_set_colour window_get_colour window_set_color window_get_color window_set_position window_set_size window_set_rectangle window_center window_get_x window_get_y window_get_width window_get_height window_mouse_get_x window_mouse_get_y window_mouse_set window_view_mouse_get_x window_view_mouse_get_y window_views_mouse_get_x window_views_mouse_get_y audio_listener_position audio_listener_velocity audio_listener_orientation audio_emitter_position audio_emitter_create audio_emitter_free audio_emitter_exists audio_emitter_pitch audio_emitter_velocity audio_emitter_falloff audio_emitter_gain audio_play_sound audio_play_sound_on audio_play_sound_at audio_stop_sound audio_resume_music audio_music_is_playing audio_resume_sound audio_pause_sound audio_pause_music audio_channel_num audio_sound_length audio_get_type audio_falloff_set_model audio_play_music audio_stop_music audio_master_gain audio_music_gain audio_sound_gain audio_sound_pitch audio_stop_all audio_resume_all audio_pause_all audio_is_playing audio_is_paused audio_exists audio_sound_set_track_position audio_sound_get_track_position audio_emitter_get_gain audio_emitter_get_pitch audio_emitter_get_x audio_emitter_get_y audio_emitter_get_z audio_emitter_get_vx audio_emitter_get_vy audio_emitter_get_vz audio_listener_set_position audio_listener_set_velocity audio_listener_set_orientation audio_listener_get_data audio_set_master_gain audio_get_master_gain audio_sound_get_gain audio_sound_get_pitch audio_get_name audio_sound_set_track_position audio_sound_get_track_position audio_create_stream audio_destroy_stream audio_create_sync_group audio_destroy_sync_group audio_play_in_sync_group audio_start_sync_group audio_stop_sync_group audio_pause_sync_group audio_resume_sync_group audio_sync_group_get_track_pos audio_sync_group_debug audio_sync_group_is_playing audio_debug audio_group_load audio_group_unload audio_group_is_loaded audio_group_load_progress audio_group_name audio_group_stop_all audio_group_set_gain audio_create_buffer_sound audio_free_buffer_sound audio_create_play_queue audio_free_play_queue audio_queue_sound audio_get_recorder_count audio_get_recorder_info audio_start_recording audio_stop_recording audio_sound_get_listener_mask audio_emitter_get_listener_mask audio_get_listener_mask audio_sound_set_listener_mask audio_emitter_set_listener_mask audio_set_listener_mask audio_get_listener_count audio_get_listener_info audio_system show_message show_message_async clickable_add clickable_add_ext clickable_change clickable_change_ext clickable_delete clickable_exists clickable_set_style show_question show_question_async get_integer get_string get_integer_async get_string_async get_login_async get_open_filename get_save_filename get_open_filename_ext get_save_filename_ext show_error highscore_clear highscore_add highscore_value highscore_name draw_highscore sprite_exists sprite_get_name sprite_get_number sprite_get_width sprite_get_height sprite_get_xoffset sprite_get_yoffset sprite_get_bbox_left sprite_get_bbox_right sprite_get_bbox_top sprite_get_bbox_bottom sprite_save sprite_save_strip sprite_set_cache_size sprite_set_cache_size_ext sprite_get_tpe sprite_prefetch sprite_prefetch_multi sprite_flush sprite_flush_multi sprite_set_speed sprite_get_speed_type sprite_get_speed font_exists font_get_name font_get_fontname font_get_bold font_get_italic font_get_first font_get_last font_get_size font_set_cache_size path_exists path_get_name path_get_length path_get_time path_get_kind path_get_closed path_get_precision path_get_number path_get_point_x path_get_point_y path_get_point_speed path_get_x path_get_y path_get_speed script_exists script_get_name timeline_add timeline_delete timeline_clear timeline_exists timeline_get_name timeline_moment_clear timeline_moment_add_script timeline_size timeline_max_moment object_exists object_get_name object_get_sprite object_get_solid object_get_visible object_get_persistent object_get_mask object_get_parent object_get_physics object_is_ancestor room_exists room_get_name sprite_set_offset sprite_duplicate sprite_assign sprite_merge sprite_add sprite_replace sprite_create_from_surface sprite_add_from_surface sprite_delete sprite_set_alpha_from_sprite sprite_collision_mask font_add_enable_aa font_add_get_enable_aa font_add font_add_sprite font_add_sprite_ext font_replace font_replace_sprite font_replace_sprite_ext font_delete path_set_kind path_set_closed path_set_precision path_add path_assign path_duplicate path_append path_delete path_add_point path_insert_point path_change_point path_delete_point path_clear_points path_reverse path_mirror path_flip path_rotate path_rescale path_shift script_execute object_set_sprite object_set_solid object_set_visible object_set_persistent object_set_mask room_set_width room_set_height room_set_persistent room_set_background_colour room_set_background_color room_set_view room_set_viewport room_get_viewport room_set_view_enabled room_add room_duplicate room_assign room_instance_add room_instance_clear room_get_camera room_set_camera asset_get_index asset_get_type file_text_open_from_string file_text_open_read file_text_open_write file_text_open_append file_text_close file_text_write_string file_text_write_real file_text_writeln file_text_read_string file_text_read_real file_text_readln file_text_eof file_text_eoln file_exists file_delete file_rename file_copy directory_exists directory_create directory_destroy file_find_first file_find_next file_find_close file_attributes filename_name filename_path filename_dir filename_drive filename_ext filename_change_ext file_bin_open file_bin_rewrite file_bin_close file_bin_position file_bin_size file_bin_seek file_bin_write_byte file_bin_read_byte parameter_count parameter_string environment_get_variable ini_open_from_string ini_open ini_close ini_read_string ini_read_real ini_write_string ini_write_real ini_key_exists ini_section_exists ini_key_delete ini_section_delete ds_set_precision ds_exists ds_stack_create ds_stack_destroy ds_stack_clear ds_stack_copy ds_stack_size ds_stack_empty ds_stack_push ds_stack_pop ds_stack_top ds_stack_write ds_stack_read ds_queue_create ds_queue_destroy ds_queue_clear ds_queue_copy ds_queue_size ds_queue_empty ds_queue_enqueue ds_queue_dequeue ds_queue_head ds_queue_tail ds_queue_write ds_queue_read ds_list_create ds_list_destroy ds_list_clear ds_list_copy ds_list_size ds_list_empty ds_list_add ds_list_insert ds_list_replace ds_list_delete ds_list_find_index ds_list_find_value ds_list_mark_as_list ds_list_mark_as_map ds_list_sort ds_list_shuffle ds_list_write ds_list_read ds_list_set ds_map_create ds_map_destroy ds_map_clear ds_map_copy ds_map_size ds_map_empty ds_map_add ds_map_add_list ds_map_add_map ds_map_replace ds_map_replace_map ds_map_replace_list ds_map_delete ds_map_exists ds_map_find_value ds_map_find_previous ds_map_find_next ds_map_find_first ds_map_find_last ds_map_write ds_map_read ds_map_secure_save ds_map_secure_load ds_map_secure_load_buffer ds_map_secure_save_buffer ds_map_set ds_priority_create ds_priority_destroy ds_priority_clear ds_priority_copy ds_priority_size ds_priority_empty ds_priority_add ds_priority_change_priority ds_priority_find_priority ds_priority_delete_value ds_priority_delete_min ds_priority_find_min ds_priority_delete_max ds_priority_find_max ds_priority_write ds_priority_read ds_grid_create ds_grid_destroy ds_grid_copy ds_grid_resize ds_grid_width ds_grid_height ds_grid_clear ds_grid_set ds_grid_add ds_grid_multiply ds_grid_set_region ds_grid_add_region ds_grid_multiply_region ds_grid_set_disk ds_grid_add_disk ds_grid_multiply_disk ds_grid_set_grid_region ds_grid_add_grid_region ds_grid_multiply_grid_region ds_grid_get ds_grid_get_sum ds_grid_get_max ds_grid_get_min ds_grid_get_mean ds_grid_get_disk_sum ds_grid_get_disk_min ds_grid_get_disk_max ds_grid_get_disk_mean ds_grid_value_exists ds_grid_value_x ds_grid_value_y ds_grid_value_disk_exists ds_grid_value_disk_x ds_grid_value_disk_y ds_grid_shuffle ds_grid_write ds_grid_read ds_grid_sort ds_grid_set ds_grid_get effect_create_below effect_create_above effect_clear part_type_create part_type_destroy part_type_exists part_type_clear part_type_shape part_type_sprite part_type_size part_type_scale part_type_orientation part_type_life part_type_step part_type_death part_type_speed part_type_direction part_type_gravity part_type_colour1 part_type_colour2 part_type_colour3 part_type_colour_mix part_type_colour_rgb part_type_colour_hsv part_type_color1 part_type_color2 part_type_color3 part_type_color_mix part_type_color_rgb part_type_color_hsv part_type_alpha1 part_type_alpha2 part_type_alpha3 part_type_blend part_system_create part_system_create_layer part_system_destroy part_system_exists part_system_clear part_system_draw_order part_system_depth part_system_position part_system_automatic_update part_system_automatic_draw part_system_update part_system_drawit part_system_get_layer part_system_layer part_particles_create part_particles_create_colour part_particles_create_color part_particles_clear part_particles_count part_emitter_create part_emitter_destroy part_emitter_destroy_all part_emitter_exists part_emitter_clear part_emitter_region part_emitter_burst part_emitter_stream external_call external_define external_free window_handle window_device matrix_get matrix_set matrix_build_identity matrix_build matrix_build_lookat matrix_build_projection_ortho matrix_build_projection_perspective matrix_build_projection_perspective_fov matrix_multiply matrix_transform_vertex matrix_stack_push matrix_stack_pop matrix_stack_multiply matrix_stack_set matrix_stack_clear matrix_stack_top matrix_stack_is_empty browser_input_capture os_get_config os_get_info os_get_language os_get_region os_lock_orientation display_get_dpi_x display_get_dpi_y display_set_gui_size display_set_gui_maximise display_set_gui_maximize device_mouse_dbclick_enable display_set_timing_method display_get_timing_method display_set_sleep_margin display_get_sleep_margin virtual_key_add virtual_key_hide virtual_key_delete virtual_key_show draw_enable_drawevent draw_enable_swf_aa draw_set_swf_aa_level draw_get_swf_aa_level draw_texture_flush draw_flush gpu_set_blendenable gpu_set_ztestenable gpu_set_zfunc gpu_set_zwriteenable gpu_set_lightingenable gpu_set_fog gpu_set_cullmode gpu_set_blendmode gpu_set_blendmode_ext gpu_set_blendmode_ext_sepalpha gpu_set_colorwriteenable gpu_set_colourwriteenable gpu_set_alphatestenable gpu_set_alphatestref gpu_set_alphatestfunc gpu_set_texfilter gpu_set_texfilter_ext gpu_set_texrepeat gpu_set_texrepeat_ext gpu_set_tex_filter gpu_set_tex_filter_ext gpu_set_tex_repeat gpu_set_tex_repeat_ext gpu_set_tex_mip_filter gpu_set_tex_mip_filter_ext gpu_set_tex_mip_bias gpu_set_tex_mip_bias_ext gpu_set_tex_min_mip gpu_set_tex_min_mip_ext gpu_set_tex_max_mip gpu_set_tex_max_mip_ext gpu_set_tex_max_aniso gpu_set_tex_max_aniso_ext gpu_set_tex_mip_enable gpu_set_tex_mip_enable_ext gpu_get_blendenable gpu_get_ztestenable gpu_get_zfunc gpu_get_zwriteenable gpu_get_lightingenable gpu_get_fog gpu_get_cullmode gpu_get_blendmode gpu_get_blendmode_ext gpu_get_blendmode_ext_sepalpha gpu_get_blendmode_src gpu_get_blendmode_dest gpu_get_blendmode_srcalpha gpu_get_blendmode_destalpha gpu_get_colorwriteenable gpu_get_colourwriteenable gpu_get_alphatestenable gpu_get_alphatestref gpu_get_alphatestfunc gpu_get_texfilter gpu_get_texfilter_ext gpu_get_texrepeat gpu_get_texrepeat_ext gpu_get_tex_filter gpu_get_tex_filter_ext gpu_get_tex_repeat gpu_get_tex_repeat_ext gpu_get_tex_mip_filter gpu_get_tex_mip_filter_ext gpu_get_tex_mip_bias gpu_get_tex_mip_bias_ext gpu_get_tex_min_mip gpu_get_tex_min_mip_ext gpu_get_tex_max_mip gpu_get_tex_max_mip_ext gpu_get_tex_max_aniso gpu_get_tex_max_aniso_ext gpu_get_tex_mip_enable gpu_get_tex_mip_enable_ext gpu_push_state gpu_pop_state gpu_get_state gpu_set_state draw_light_define_ambient draw_light_define_direction draw_light_define_point draw_light_enable draw_set_lighting draw_light_get_ambient draw_light_get draw_get_lighting shop_leave_rating url_get_domain url_open url_open_ext url_open_full get_timer achievement_login achievement_logout achievement_post achievement_increment achievement_post_score achievement_available achievement_show_achievements achievement_show_leaderboards achievement_load_friends achievement_load_leaderboard achievement_send_challenge achievement_load_progress achievement_reset achievement_login_status achievement_get_pic achievement_show_challenge_notifications achievement_get_challenges achievement_event achievement_show achievement_get_info cloud_file_save cloud_string_save cloud_synchronise ads_enable ads_disable ads_setup ads_engagement_launch ads_engagement_available ads_engagement_active ads_event ads_event_preload ads_set_reward_callback ads_get_display_height ads_get_display_width ads_move ads_interstitial_available ads_interstitial_display device_get_tilt_x device_get_tilt_y device_get_tilt_z device_is_keypad_open device_mouse_check_button device_mouse_check_button_pressed device_mouse_check_button_released device_mouse_x device_mouse_y device_mouse_raw_x device_mouse_raw_y device_mouse_x_to_gui device_mouse_y_to_gui iap_activate iap_status iap_enumerate_products iap_restore_all iap_acquire iap_consume iap_product_details iap_purchase_details facebook_init facebook_login facebook_status facebook_graph_request facebook_dialog facebook_logout facebook_launch_offerwall facebook_post_message facebook_send_invite facebook_user_id facebook_accesstoken facebook_check_permission facebook_request_read_permissions facebook_request_publish_permissions gamepad_is_supported gamepad_get_device_count gamepad_is_connected gamepad_get_description gamepad_get_button_threshold gamepad_set_button_threshold gamepad_get_axis_deadzone gamepad_set_axis_deadzone gamepad_button_count gamepad_button_check gamepad_button_check_pressed gamepad_button_check_released gamepad_button_value gamepad_axis_count gamepad_axis_value gamepad_set_vibration gamepad_set_colour gamepad_set_color os_is_paused window_has_focus code_is_compiled http_get http_get_file http_post_string http_request json_encode json_decode zip_unzip load_csv base64_encode base64_decode md5_string_unicode md5_string_utf8 md5_file os_is_network_connected sha1_string_unicode sha1_string_utf8 sha1_file os_powersave_enable analytics_event analytics_event_ext win8_livetile_tile_notification win8_livetile_tile_clear win8_livetile_badge_notification win8_livetile_badge_clear win8_livetile_queue_enable win8_secondarytile_pin win8_secondarytile_badge_notification win8_secondarytile_delete win8_livetile_notification_begin win8_livetile_notification_secondary_begin win8_livetile_notification_expiry win8_livetile_notification_tag win8_livetile_notification_text_add win8_livetile_notification_image_add win8_livetile_notification_end win8_appbar_enable win8_appbar_add_element win8_appbar_remove_element win8_settingscharm_add_entry win8_settingscharm_add_html_entry win8_settingscharm_add_xaml_entry win8_settingscharm_set_xaml_property win8_settingscharm_get_xaml_property win8_settingscharm_remove_entry win8_share_image win8_share_screenshot win8_share_file win8_share_url win8_share_text win8_search_enable win8_search_disable win8_search_add_suggestions win8_device_touchscreen_available win8_license_initialize_sandbox win8_license_trial_version winphone_license_trial_version winphone_tile_title winphone_tile_count winphone_tile_back_title winphone_tile_back_content winphone_tile_back_content_wide winphone_tile_front_image winphone_tile_front_image_small winphone_tile_front_image_wide winphone_tile_back_image winphone_tile_back_image_wide winphone_tile_background_colour winphone_tile_background_color winphone_tile_icon_image winphone_tile_small_icon_image winphone_tile_wide_content winphone_tile_cycle_images winphone_tile_small_background_image physics_world_create physics_world_gravity physics_world_update_speed physics_world_update_iterations physics_world_draw_debug physics_pause_enable physics_fixture_create physics_fixture_set_kinematic physics_fixture_set_density physics_fixture_set_awake physics_fixture_set_restitution physics_fixture_set_friction physics_fixture_set_collision_group physics_fixture_set_sensor physics_fixture_set_linear_damping physics_fixture_set_angular_damping physics_fixture_set_circle_shape physics_fixture_set_box_shape physics_fixture_set_edge_shape physics_fixture_set_polygon_shape physics_fixture_set_chain_shape physics_fixture_add_point 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,/u\{[0-9a-fA-F]{1,8}\}/)}]}),T=(e="")=>({className:"subst",
+match:a(/\\/,e,/[\t ]*(?:[\r\n]|\r\n)/)}),L=(e="")=>({className:"subst",
+label:"interpol",begin:a(/\\/,e,/\(/),end:/\)/}),P=(e="")=>({begin:a(e,/"""/),
+end:a(/"""/,e),contains:[O(e),T(e),L(e)]}),$=(e="")=>({begin:a(e,/"/),
+end:a(/"/,e),contains:[O(e),L(e)]}),K={className:"string",
+variants:[P(),P("#"),P("##"),P("###"),$(),$("#"),$("##"),$("###")]},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:[{
 className:"type",
-begin:i(/(AV|CA|CF|CG|CI|CL|CM|CN|CT|MK|MP|MTK|MTL|NS|SCN|SK|UI|WK|XC)/,f,"+")
-},{className:"type",begin:w,relevance:0},{begin:/[?!]+/,relevance:0},{
-begin:/\.\.\./,relevance:0},{begin:i(/\s+&\s+/,n(w)),relevance:0}]},P={
-begin:/</,end:/>/,keywords:_,contains:[...N,...j,B,K]};K.contains.push(P)
-;for(const e of $.variants){const n=e.contains.find((e=>"interpol"===e.label))
-;n.keywords=_;const i=[...N,...D,...M,S,$,...T];n.contains=[...i,{begin:/\(/,
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-contains:[e.C_LINE_COMMENT_MODE,p,{className:"function",beginKeywords:"func",
-end:/\{/,excludeEnd:!0,contains:[e.inherit(e.TITLE_MODE,{
-begin:/[A-Za-z$_][0-9A-Za-z$_]*/}),{begin:/</,end:/>/},{className:"params",
-begin:/\(/,end:/\)/,endsParent:!0,keywords:_,
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-illegal:/\[|%/},{className:"class",
-beginKeywords:"struct protocol class extension enum",end:"\\{",excludeEnd:!0,
-keywords:_,contains:[e.inherit(e.TITLE_MODE,{
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-end:/$/,contains:[e.C_LINE_COMMENT_MODE,p],relevance:0
-},...N,...D,...M,S,$,...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,"+")
+},{className:"type",match:y,relevance:0},{match:/[?!]+/,relevance:0},{
+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"
 ;const e="[A-Za-z$_][0-9A-Za-z$_]*",n=["as","in","of","if","for","while","finally","var","new","function","do","return","void","else","break","catch","instanceof","with","throw","case","default","try","switch","continue","typeof","delete","let","yield","const","class","debugger","async","await","static","import","from","export","extends"],a=["true","false","null","undefined","NaN","Infinity"],s=[].concat(["setInterval","setTimeout","clearInterval","clearTimeout","require","exports","eval","isFinite","isNaN","parseFloat","parseInt","decodeURI","decodeURIComponent","encodeURI","encodeURIComponent","escape","unescape"],["arguments","this","super","console","window","document","localStorage","module","global"],["Intl","DataView","Number","Math","Date","String","RegExp","Object","Function","Boolean","Error","Symbol","Set","Map","WeakSet","WeakMap","Proxy","Reflect","JSON","Promise","Float64Array","Int16Array","Int32Array","Int8Array","Uint16Array","Uint32Array","Float32Array","Array","Uint8Array","Uint8ClampedArray","ArrayBuffer"],["EvalError","InternalError","RangeError","ReferenceError","SyntaxError","TypeError","URIError"])
-;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={$pattern:e,
-keyword:n.concat(["type","namespace","typedef","interface","public","private","protected","implements","declare","abstract","readonly"]).join(" "),
-literal:a.join(" "),
-built_in:s.concat(["any","void","number","boolean","string","object","never","enum"]).join(" ")
+keyword:n.concat(["type","namespace","typedef","interface","public","private","protected","implements","declare","abstract","readonly"]),
+literal:a,
+built_in:s.concat(["any","void","number","boolean","string","object","never","enum"])
 },o={className:"meta",begin:"@[A-Za-z$_][0-9A-Za-z$_]*"},l=(e,n,a)=>{
 const s=e.contains.findIndex((e=>e.label===n))
 ;if(-1===s)throw Error("can not find mode to replace");e.contains.splice(s,1,a)
-},b=(r=>{const c=e,o={begin:/<[A-Za-z0-9\\._:-]+/,
+},b=(i=>{const c=e,o={begin:/<[A-Za-z0-9\\._:-]+/,
 end:/\/[A-Za-z0-9\\._:-]+>|\/>/,isTrulyOpeningTag:(e,n)=>{
 const a=e[0].length+e.index,s=e.input[a];"<"!==s?">"===s&&(((e,{after:n})=>{
 const a="</"+e[0].slice(1);return-1!==e.input.indexOf(a,n)})(e,{after:a
-})||n.ignoreMatch()):n.ignoreMatch()}},l={$pattern:e,keyword:n.join(" "),
-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={$pattern:e,keyword:n,literal:a,
+built_in:s},b="\\.([0-9](_?[0-9])*)",d="0|[1-9](_?[0-9])*|0[0-7]*[89][0-9]*",g={
 className:"number",variants:[{
 begin:`(\\b(${d})((${b})|\\.)?|(${b}))[eE][+-]?([0-9](_?[0-9])*)\\b`},{
 begin:`\\b(${d})\\b((${b})\\b|\\.)?|(${b})\\b`},{
@@ -3413,53 +3448,53 @@
 begin:"\\b0[bB][0-1](_?[0-1])*n?\\b"},{begin:"\\b0[oO][0-7](_?[0-7])*n?\\b"},{
 begin:"\\b0[0-7]+n?\\b"}],relevance:0},u={className:"subst",begin:"\\$\\{",
 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)
 });const N=[].concat(y,u.contains),f=N.concat([{begin:/\(/,end:/\)/,keywords:l,
 contains:["self"].concat(N)}]),A={className:"params",begin:/\(/,end:/\)/,
 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",
 relevance:5}),{label:"use_strict",className:"meta",relevance:10,
 begin:/^\s*['"]use (strict|asm)['"]/
-},r.APOS_STRING_MODE,r.QUOTE_STRING_MODE,E,m,_,y,g,{
-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*:"))),
 relevance:0,contains:[{className:"attr",begin:c+t("\\s*:"),relevance:0}]},{
-begin:"("+r.RE_STARTERS_RE+"|\\b(case|return|throw)\\b)\\s*",
-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*=>",
 returnBegin:!0,end:"\\s*=>",contains:[{className:"params",variants:[{
-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
 },{begin:/\(/,end:/\)/,excludeBegin:!0,excludeEnd:!0,keywords:l,contains:f}]}]
 },{begin:/,/,relevance:0},{className:"",begin:/\s/,end:/\s*/,skip:!0},{
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 contains:["self"]}]}],relevance:0},{className:"function",
 beginKeywords:"function",end:/[{;]/,excludeEnd:!0,keywords:l,
-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:[{
-beginKeywords:"extends"},r.UNDERSCORE_TITLE_MODE]},{begin:/\b(?=constructor)/,
-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,
 begin:/^\s*['"]use strict['"]/
 }),b.contains.find((e=>"function"===e.className)).relevance=0,Object.assign(b,{
 name:"TypeScript",aliases:["ts"]}),b}})());
@@ -3505,9 +3540,9 @@
 const i="lcase month vartype instrrev ubound setlocale getobject rgb getref string weekdayname rnd dateadd monthname now day minute isarray cbool round formatcurrency conversions csng timevalue second year space abs clng timeserial fixs len asc isempty maths dateserial atn timer isobject filter weekday datevalue ccur isdate instr datediff formatdatetime replace isnull right sgn array snumeric log cdbl hex chr lbound msgbox ucase getlocale cos cdate cbyte rtrim join hour oct typename trim strcomp int createobject loadpicture tan formatnumber mid split  cint sin datepart ltrim sqr time derived eval date formatpercent exp inputbox left ascw chrw regexp cstr err".split(" ")
 ;return{name:"VBScript",aliases:["vbs"],case_insensitive:!0,keywords:{
 keyword:"call class const dim do loop erase execute executeglobal exit for each next function if then else on error option explicit new private property let get public randomize redim rem select case set stop sub while wend with end to elseif is or xor and not class_initialize class_terminate default preserve in me byval byref step resume goto",
-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(/'/,/$/,{
 relevance:0}),e.C_NUMBER_MODE]}}})());
 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/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/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/change/gr-change-metadata/gr-change-metadata_html.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_html.ts
index cd17271..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
@@ -115,6 +115,11 @@
          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">
     <template is="dom-if" if="[[_isNewChangeSummaryUiEnabled]]">
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 61006f9..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
@@ -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 81aff90..f3fb860 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
@@ -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-m);
       /* 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-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 7af9d66..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
@@ -95,9 +95,11 @@
     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;
+        }
       }
     }
     const stringVal = `${numberValue}`;
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 95a6af9..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
@@ -92,6 +92,7 @@
 } from '@polymer/polymer/interfaces';
 import {
   areSetsEqual,
+  assertIsDefined,
   assertNever,
   containsAll,
 } from '../../../utils/common-util';
@@ -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/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 f6f4395..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
@@ -45,6 +45,7 @@
 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/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-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-rest-api-interface/gr-rest-api-interface.ts b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.ts
index 6e17c75..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
@@ -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/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/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/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.