diff --git a/.bazelrc b/.bazelrc
index b9189c1..6e26484 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,4 +1,4 @@
-build --workspace_status_command="python ./tools/workspace_status.py" --strategy=Closure=worker
+build --workspace_status_command="python ./tools/workspace_status.py"
 build --repository_cache=~/.gerritcodereview/bazel-cache/repository
 build --action_env=PATH
 build --disk_cache=~/.gerritcodereview/bazel-cache/cas
diff --git a/BUILD b/BUILD
index c48b3b9..084d383 100644
--- a/BUILD
+++ b/BUILD
@@ -56,19 +56,22 @@
 API_DEPS = [
     "//java/com/google/gerrit/acceptance:framework_deploy.jar",
     "//java/com/google/gerrit/acceptance:libframework-lib-src.jar",
-    "//java/com/google/gerrit/acceptance:framework-javadoc",
     "//java/com/google/gerrit/extensions:extension-api_deploy.jar",
     "//java/com/google/gerrit/extensions:libapi-src.jar",
-    "//java/com/google/gerrit/extensions:extension-api-javadoc",
     "//plugins:plugin-api_deploy.jar",
     "//plugins:plugin-api-sources_deploy.jar",
+]
+
+API_JAVADOC_DEPS = [
+    "//java/com/google/gerrit/acceptance:framework-javadoc",
+    "//java/com/google/gerrit/extensions:extension-api-javadoc",
     "//plugins:plugin-api-javadoc",
 ]
 
 genrule2(
     name = "api",
     testonly = True,
-    srcs = API_DEPS,
+    srcs = API_DEPS + API_JAVADOC_DEPS,
     outs = ["api.zip"],
     cmd = " && ".join([
         "cp $(SRCS) $$TMP",
@@ -76,3 +79,15 @@
         "zip -qr $$ROOT/$@ .",
     ]),
 )
+
+genrule2(
+    name = "api-skip-javadoc",
+    testonly = True,
+    srcs = API_DEPS,
+    outs = ["api-skip-javadoc.zip"],
+    cmd = " && ".join([
+        "cp $(SRCS) $$TMP",
+        "cd $$TMP",
+        "zip -qr $$ROOT/$@ .",
+    ]),
+)
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index ac5e3b7..b1f9a31 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -2336,8 +2336,8 @@
 [[gerrit.experimentalRollingUpgrade]]gerrit.experimentalRollingUpgrade::
 +
 Enable Gerrit rolling upgrade to the next version.
-For example if Gerrit v3.1 is version N (All-Projects:refs/meta/version=181)
-then its next version N+1 is v3.2 (All-Projects:refs/meta/version=183).
+For example if Gerrit v3.2 is version N (All-Projects:refs/meta/version=183)
+then its next version N+1 is v3.3 (All-Projects:refs/meta/version=184).
 Allow Gerrit to start even if the underlying schema version has been bumped to
 the next Gerrit version.
 +
@@ -2354,7 +2354,7 @@
 1. Set gerrit.experimentalRollingUpgrade to true on all Gerrit masters
 2. Set the first master unhealthy
 3. Shutdown the first master and [upgrade](install.html#init) to the next version
-4. Startup the first master, wait for the online reindex to complete
+4. Startup the first master, wait for the online reindex to complete (where applicable)
 5. Verify the the first master upgrade is successful and online reindex is complete
 6. Set the first master healthy
 7. Repeat steps 2. to 6. for all the other Gerrit nodes
@@ -2512,6 +2512,18 @@
 [[groups]]
 === Section groups
 
+[[groups.includeExternalUsersInRegisteredUsersGroup]]groups.includeExternalUsersInRegisteredUsersGroup::
++
+Controls whether external users (these are users we have sufficient
+knowledge about but who don't yet have a Gerrit account) are considered
+to be members of the `REGISTERED_USERS` group.
++
+This setting only makes sense if you run custom code (e.g. from a plugin
+or a custom authentication backend). By default, Gerrit core always requires
+users to register and doesn't use external users.
++
+By default, true.
+
 [[groups.newGroupsVisibleToAll]]groups.newGroupsVisibleToAll::
 +
 Controls whether newly created groups should be by default visible to
@@ -3276,10 +3288,6 @@
 for production use. For compatibility information, please refer to the
 link:https://www.gerritcodereview.com/elasticsearch.html[project homepage,role=external,window=_blank].
 
-In Elasticsearch version 6.2 or later, the open and closed changes are merged
-into the default `_doc` type. The latter is also used for the accounts and groups
-indices starting with Elasticsearch 6.2.
-
 Note that when Gerrit is configured to use Elasticsearch, the Elasticsearch
 server(s) must be reachable during the site initialization.
 
@@ -3309,7 +3317,7 @@
 link:https://www.elastic.co/guide/en/elasticsearch/reference/current/index-modules.html#_static_index_settings[
 Elasticsearch documentation,role=external,window=_blank] for details.
 +
-Defaults to 5 for Elasticsearch versions 5 and 6, and to 1 starting with Elasticsearch 7.
+Defaults to 1.
 
 [[elasticsearch.numberOfReplicas]]elasticsearch.numberOfReplicas::
 +
@@ -3327,6 +3335,19 @@
 +
 Defaults to 10000.
 
+[[elasticsearch.connectTimeout]]elasticsearch.connectTimeout::
++
+Sets the timeout for connecting to elasticsearch.
++
+Defaults to `1 second`.
+
+[[elasticsearch.socketTimeout]]elasticsearch.socketTimeout::
++
+Sets the timeout for the underlying connection. For more information, refer to
+link:#httpd.idleTimeout[`httpd.idleTimeout`].
++
+Defaults to `30 seconds`.
+
 ==== Elasticsearch Security
 
 When security is enabled in Elasticsearch, the username and password must be provided.
@@ -3373,6 +3394,49 @@
 config is backwards compatible with what the default was before the config
 was added.
 
+[[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
+currently patch set level, file and robot comments are not exposed in the
+`comment-added` event type, those comments will be lost. One particular use
+case is to re-trigger CI build from the change screen by adding a comment with
+specific content, e.g.: `recheck`. Jenkins Gerrit Trigger plugin and Zuul CI
+depend on this feature to trigger change verification.
++
+By default, true.
+
+[[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
+gets removed
+
+[[experiments.enabled]]experiments.enabled::
++
+List of experiments that are currently enabled. The release notes contain currently
+available experiments.
++
+We will not remove experiments in stable patch releases. They are likely to be
+removed in the next stable version.
+
+----
+[experiments]
+  enabled = ExperimentKey
+----
+
+[[experiments.disabled]]experiments.disabled::
++
+List of experiments that are currently disabled. The release notes contain currently
+available experiments. This list disables experiments with the given key that are
+either enabled by default or explicitly in the config.
+
+----
+[experiments]
+  disabled = ExperimentKey
+----
 
 [[ldap]]
 === Section ldap
@@ -5625,10 +5689,12 @@
 
 [[receive.autogc]]receive.autogc::
 +
-By default, `git-receive-pack` will run auto gc after receiving data from git-push and updating refs.
+By default, up to Gerrit 3.2 `git-receive-pack` will run auto gc after receiving data from git-push and updating refs.
 You can stop it by setting this variable to `false`. This is recommended in gerrit to avoid the
 additional load this creates. Instead schedule gc using link:cmd-gc.html#gc.startTime[gc.startTime]
 and link:cmd-gc.html#gc.interval[gc.interval] or e.g. in a cron job that runs gc in a separate process.
+Since Gerrit 3.3 the init command will auto-configure `git-receive-pack = false` in `etc/jgit.config` if
+it wasn't set manually and show a warning if it was set to `true` manually.
 
 GERRIT
 ------
diff --git a/Documentation/dev-plugins.txt b/Documentation/dev-plugins.txt
index 2f4c46c..f5b7282 100644
--- a/Documentation/dev-plugins.txt
+++ b/Documentation/dev-plugins.txt
@@ -1453,6 +1453,19 @@
   [...]
 ----
 
+[post_review_extensions]
+== Post Review Extensions
+
+By implementing the `com.google.gerrit.server.restapi.change.OnPostReview`
+interface plugins can extend the change message that is being posted when the
+[post review](rest-api-changes.html#set-review) REST endpoint is invoked.
+
+This is useful if certain approvals have a special meaning (e.g. custom logic
+that is implemented in Prolog submit rules, signal for triggering an action
+like running CI etc.), as it allows the plugin to tell users about this meaning
+in the change message. This makes the effect of a given approval more
+transparent to the user. 
+
 [[ui_extension]]
 == UI Extension
 
@@ -2242,7 +2255,7 @@
 
   @Override
   public WebLinkInfo getPatchSetWebLink(String projectName, String commit,
-   String subject, String branchName) {
+   String commitMessage, String branchName) {
     return new WebLinkInfo(name,
         imageUrl,
         String.format(placeHolderUrlProjectCommit, project, commit),
@@ -2457,6 +2470,32 @@
 Macros that start with `\` such as `\@KEEP@` will render as `@KEEP@`
 even if there is an expansion for `KEEP` in the future.
 
+Documentation should typically contain the following content:
+
+[width="100%",options="header"]
+|===================================================
+|File                                           | Content
+|`README.md`                                    | Home page of the plugin when browsing its source code on Git
+|`LICENSE`                                      | Open-source license
+|`resources/Documentation/about.md`             | Overview of the plugin and its purpose
+|`resources/Documentation/config.md`            | Plugin configuration settings and sample configs
+|`resources/Documentation/build.md`             | How to build the plugin
+|`resources/Documentation/cmd-<command>.md`     | SSH commands
+|`resources/Documentation/rest-api-<api>.md`    | REST API
+|`resources/Documentation/servlet-<servlet>.md` | HTTP Servlets
+|===================================================
+
+The documentation under resources/Documentation may contain macro that
+will be included and expanded by Gerrit once the plugin is loaded.
+
+The files in the root directory are not included in the plugin package
+and must not have any macro for expansion. It may also collect
+additional information that would make the plugin more discoverable, such as
+a more user-friendly description of its use-cases.
+
+The documentation can also include images that can help understanding more
+visually how the plugin can interact with the other Gerrit components.
+
 [[auto-index]]
 === Automatic Index
 
diff --git a/Documentation/dev-processes.txt b/Documentation/dev-processes.txt
index 0eb3972..68e56ba 100644
--- a/Documentation/dev-processes.txt
+++ b/Documentation/dev-processes.txt
@@ -271,6 +271,15 @@
 It's also possible that the ESC decides that an issue is not a security issue
 and the embargo is lifted immediately.
 
+. Filing a CVE
++
+For every security issue a CVE that describes the issue and lists the affected
+releases should be filed. Filing a CVE can be done by any maintainer that works
+for an organization that can request CVE numbers (e.g. Googlers). The CVE
+number must be included in the release notes. The CVE itself is only made
+public after fixed released have been published and the embargo has been
+lifted.
+
 . Implementation of the security fix:
 +
 To keep the embargo intact, security fixes cannot be developed and reviewed in
@@ -316,6 +325,8 @@
 This ends the embargo and any issue that discusses the security vulnerability
 should be made public.
 
+. Publish the CVE
+
 . Follow-Up
 +
 The ESC should discuss if there are any learnings from the security
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 43c3b9e..d897210 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -15,7 +15,9 @@
 --
 
 The change input link:#change-input[ChangeInput] entity must be provided in the
-request body.
+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.
 
 To create a change the calling user must be allowed to
 link:access-control.html#category_push_review[upload to code review].
@@ -150,6 +152,12 @@
 The `S` or `start` query parameter can be supplied to skip a number
 of changes from the list.
 
+Administrators can use the `skip-visibility` query parameter to skip visibility filtering.
+This can be used to ensure that no changes are missed e.g. when querying for changes which
+need to be reindexed. Without this parameter query results the user has no permission to read
+are filtered out. REST requests with the skip-visibility option are rejected when the current
+user doesn't have the ADMINISTRATE_SERVER capability.
+
 Clients are allowed to specify more than one query by setting the `q`
 parameter multiple times. In this case the result is an array of
 arrays, one per query in the same order the queries were given in.
@@ -1388,6 +1396,8 @@
 
 The destination branch must be provided in the request body inside a
 link:#move-input[MoveInput] entity.
+Only veto votes that are blocking the change from submission are moved to
+the destination branch by default.
 
 .Request
 ----
@@ -7354,6 +7364,11 @@
 |`destination_branch`||Destination branch
 |`message`           |optional|
 A message to be posted in this change's comments
+|`keep_all_votes`    |optional, defaults to false|
+By default, only veto votes that are blocking the change from submission are moved to
+the destination branch. Using this option is only allowed for administrators,
+because it can affect the submission behaviour of the change (depending on the label access
+configuration and submissions rules).
 |===========================
 
 [[notify-info]]
diff --git a/Documentation/rest-api-projects.txt b/Documentation/rest-api-projects.txt
index 6889de3..50ebad7 100644
--- a/Documentation/rest-api-projects.txt
+++ b/Documentation/rest-api-projects.txt
@@ -1702,7 +1702,9 @@
 'GET /projects/link:#project-name[\{project-name\}]/branches/link:#branch-id[\{branch-id\}]'
 --
 
-Retrieves a branch of a project.
+Retrieves a branch of a project. For the "All-Users" repository, the magic
+branch "refs/users/self" is automatically resolved to the user branch of the
+calling user.
 
 .Request
 ----
diff --git a/Documentation/user-search.txt b/Documentation/user-search.txt
index 5f18e9b..e02dc21 100644
--- a/Documentation/user-search.txt
+++ b/Documentation/user-search.txt
@@ -92,6 +92,18 @@
 format `2006-01-02[ 15:04:05[.890][ -0700]]`; omitting the time defaults
 to 00:00:00 and omitting the timezone defaults to UTC.
 
+[[mergedbefore]]
+mergedbefore:'TIME'::
++
+Changes merged before the given 'TIME'. The matching behaviour is consistent
+with `before:'TIME'`.
+
+[[mergedafter]]
+mergedafter:'TIME'::
++
+Changes merged after the given 'TIME'. The matching behaviour is consistent
+with `after:'TIME'`.
+
 [[change]]
 change:'ID'::
 +
diff --git a/WORKSPACE b/WORKSPACE
index 01decd5..b204e8d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -45,9 +45,11 @@
 load("@bazel_toolchains//rules:rbe_repo.bzl", "rbe_autoconfig")
 
 # Creates a default toolchain config for RBE.
-# Use this as is if you are using the rbe_ubuntu16_04 container,
-# otherwise refer to RBE docs.
-rbe_autoconfig(name = "rbe_default")
+rbe_autoconfig(
+    name = "rbe_jdk11",
+    java_home = "/usr/lib/jvm/11.29.3-ca-jdk11.0.2/reduced",
+    use_checked_in_confs = "Force",
+)
 
 http_archive(
     name = "com_google_protobuf",
@@ -64,8 +66,8 @@
 
 http_archive(
     name = "build_bazel_rules_nodejs",
-    sha256 = "f2194102720e662dbf193546585d705e645314319554c6ce7e47d8b59f459e9c",
-    urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/2.2.2/rules_nodejs-2.2.2.tar.gz"],
+    sha256 = "84b1d11b1f3bda68c24d992dc6e830bca9db8fa12276f2ca7fcb7761c893976b",
+    urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/3.0.0-rc.1/rules_nodejs-3.0.0-rc.1.tar.gz"],
 )
 
 # Golang support for PolyGerrit local dev server.
@@ -137,36 +139,6 @@
     sha1 = "83cd2cd674a217ade95a4bb83a8a14f351f48bd0",
 )
 
-GUICE_VERS = "4.2.3"
-
-GUICE_LIBRARY_SHA256 = "5168f5e7383f978c1b4154ac777b78edd8ac214bb9f9afdb92921c8d156483d3"
-
-http_file(
-    name = "guice-library-no-aop",
-    canonical_id = "guice-library-no-aop-" + GUICE_VERS + ".jar-" + GUICE_LIBRARY_SHA256,
-    downloaded_file_path = "guice-library-no-aop.jar",
-    sha256 = GUICE_LIBRARY_SHA256,
-    urls = [
-        "https://repo1.maven.org/maven2/com/google/inject/guice/" +
-        GUICE_VERS +
-        "/guice-" +
-        GUICE_VERS +
-        "-no_aop.jar",
-    ],
-)
-
-maven_jar(
-    name = "guice-assistedinject",
-    artifact = "com.google.inject.extensions:guice-assistedinject:" + GUICE_VERS,
-    sha1 = "acbfddc556ee9496293ed1df250cc378f331d854",
-)
-
-maven_jar(
-    name = "guice-servlet",
-    artifact = "com.google.inject.extensions:guice-servlet:" + GUICE_VERS,
-    sha1 = "8d6e7e35eac4fb5e7df19c55b3bc23fa51b10a11",
-)
-
 maven_jar(
     name = "javax_inject",
     artifact = "javax.inject:javax.inject:1",
@@ -825,26 +797,30 @@
     sha1 = "fd369423346b2f1525c413e33f8cf95b09c92cbd",
 )
 
-# Note that all of the following org.apache.httpcomponents have newer versions,
-# but 4.4.1 is the only version that is available for all of them.
-HTTPCOMP_VERS = "4.4.1"
+# Base the following org.apache.httpcomponents versions on what
+# elasticsearch-rest-client explicitly depends on, except for
+# commons-codec (non-http) which is not necessary yet. Note that
+# below httpcore version(s) differs from the HTTPCOMP_VERS range,
+# upstream: that specific dependency has no HTTPCOMP_VERS version
+# equivalent currently.
+HTTPCOMP_VERS = "4.5.2"
 
 maven_jar(
     name = "fluent-hc",
     artifact = "org.apache.httpcomponents:fluent-hc:" + HTTPCOMP_VERS,
-    sha1 = "96fb842b68a44cc640c661186828b60590c71261",
+    sha1 = "7bfdfa49de6d720ad3c8cedb6a5238eec564dfed",
 )
 
 maven_jar(
     name = "httpclient",
     artifact = "org.apache.httpcomponents:httpclient:" + HTTPCOMP_VERS,
-    sha1 = "016d0bc512222f1253ee6b64d389c84e22f697f0",
+    sha1 = "733db77aa8d9b2d68015189df76ab06304406e50",
 )
 
 maven_jar(
     name = "httpcore",
-    artifact = "org.apache.httpcomponents:httpcore:" + HTTPCOMP_VERS,
-    sha1 = "f5aa318bda4c6c8d688c9d00b90681dcd82ce636",
+    artifact = "org.apache.httpcomponents:httpcore:4.4.4",
+    sha1 = "b31526a230871fbe285fbcbe2813f9c0839ae9b0",
 )
 
 # Test-only dependencies below.
@@ -899,54 +875,48 @@
     sha1 = "7e060dd5b19431e6d198e91ff670644372f60fbd",
 )
 
-JETTY_VERS = "9.4.32.v20200930"
+JETTY_VERS = "9.4.33.v20201020"
 
 maven_jar(
     name = "jetty-servlet",
     artifact = "org.eclipse.jetty:jetty-servlet:" + JETTY_VERS,
-    sha1 = "4253dd46c099e0bca4dd763fc1e10774e10de00a",
+    sha1 = "101609e8e5365c4406e4448099459eb605ac551f",
 )
 
 maven_jar(
     name = "jetty-security",
     artifact = "org.eclipse.jetty:jetty-security:" + JETTY_VERS,
-    sha1 = "16a6110fa40e49050146de5f597ab3a3a3fa83b5",
+    sha1 = "c150bf2aca6cb1636e7195f844a2bb156546e50e",
 )
 
 maven_jar(
     name = "jetty-server",
     artifact = "org.eclipse.jetty:jetty-server:" + JETTY_VERS,
-    sha1 = "d2d89099be5237cf68254bc943a7d800d3ee1945",
+    sha1 = "f586ff2ee048ad2575866c1833d854288f402307",
 )
 
 maven_jar(
     name = "jetty-jmx",
     artifact = "org.eclipse.jetty:jetty-jmx:" + JETTY_VERS,
-    sha1 = "5e8e87a6f89b8eabf5b5b1765e3d758209001570",
+    sha1 = "56b723070eeafc51b943cd9bf1a064a037e806a7",
 )
 
 maven_jar(
     name = "jetty-http",
     artifact = "org.eclipse.jetty:jetty-http:" + JETTY_VERS,
-    sha1 = "5fdcefd82178d11f895690f4fe6e843be69394b3",
+    sha1 = "ad28940f89ffde6ec1bd1656fe3f8493b01ba3c2",
 )
 
 maven_jar(
     name = "jetty-io",
     artifact = "org.eclipse.jetty:jetty-io:" + JETTY_VERS,
-    sha1 = "0d0f32c3b511d6b3a542787f95ed229731588810",
+    sha1 = "9e4b0048285b71f4769908780f957a470eca11da",
 )
 
 maven_jar(
     name = "jetty-util",
     artifact = "org.eclipse.jetty:jetty-util:" + JETTY_VERS,
-    sha1 = "efefd29006dcc9c9960a679263504287ce4e6896",
-)
-
-maven_jar(
-    name = "commons-io",
-    artifact = "commons-io:commons-io:2.2",
-    sha1 = "83b5b8a7ba1c08f9e8c8ff2373724e33d3c1e22a",
+    sha1 = "c88807f210ab216aa831b48569ef50bd797384bc",
 )
 
 maven_jar(
@@ -997,6 +967,7 @@
 
 yarn_install(
     name = "npm",
+    frozen_lockfile = False,
     package_json = "//:package.json",
     yarn_lock = "//:yarn.lock",
 )
@@ -1004,18 +975,21 @@
 yarn_install(
     name = "ui_npm",
     args = ["--prod"],
+    frozen_lockfile = False,
     package_json = "//:polygerrit-ui/app/package.json",
     yarn_lock = "//:polygerrit-ui/app/yarn.lock",
 )
 
 yarn_install(
     name = "ui_dev_npm",
+    frozen_lockfile = False,
     package_json = "//:polygerrit-ui/package.json",
     yarn_lock = "//:polygerrit-ui/yarn.lock",
 )
 
 yarn_install(
     name = "tools_npm",
+    frozen_lockfile = False,
     package_json = "//:tools/node_tools/package.json",
     yarn_lock = "//:tools/node_tools/yarn.lock",
 )
@@ -1023,6 +997,7 @@
 yarn_install(
     name = "plugins_npm",
     args = ["--prod"],
+    frozen_lockfile = False,
     package_json = "//:plugins/package.json",
     yarn_lock = "//:plugins/yarn.lock",
 )
diff --git a/contrib/reindex/.flake8 b/contrib/reindex/.flake8
new file mode 100644
index 0000000..151557f
--- /dev/null
+++ b/contrib/reindex/.flake8
@@ -0,0 +1,9 @@
+[flake8]
+max-line-length=100
+ignore=
+    # E203 whitespace before ':'
+    E203,
+    # W503: Line break before binary operator
+    W503,
+    # W504: Line break after binary operator
+    W504
diff --git a/contrib/reindex/.gitignore b/contrib/reindex/.gitignore
new file mode 100644
index 0000000..fd8c78f
--- /dev/null
+++ b/contrib/reindex/.gitignore
@@ -0,0 +1 @@
+changes-to-reindex.list
diff --git a/contrib/reindex/Pipfile b/contrib/reindex/Pipfile
new file mode 100644
index 0000000..21ffd90
--- /dev/null
+++ b/contrib/reindex/Pipfile
@@ -0,0 +1,19 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+pygerrit2 = "*"
+requests = "*"
+tqdm = "*"
+
+[dev-packages]
+flake8 = "*"
+black = "*"
+
+[requires]
+python_version = "3.9"
+
+[pipenv]
+allow_prereleases = true
diff --git a/contrib/reindex/Pipfile.lock b/contrib/reindex/Pipfile.lock
new file mode 100644
index 0000000..bb7cc2d
--- /dev/null
+++ b/contrib/reindex/Pipfile.lock
@@ -0,0 +1,248 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "37be5a74a22d0e084ebfe168bfdcd7bcaa87ad7b42be66b1d9fbff5e936ebe72"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.9"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "certifi": {
+            "hashes": [
+                "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c",
+                "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"
+            ],
+            "version": "==2020.12.5"
+        },
+        "chardet": {
+            "hashes": [
+                "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
+                "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==4.0.0"
+        },
+        "idna": {
+            "hashes": [
+                "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
+                "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.10"
+        },
+        "pbr": {
+            "hashes": [
+                "sha256:5fad80b613c402d5b7df7bd84812548b2a61e9977387a80a5fc5c396492b13c9",
+                "sha256:b236cde0ac9a6aedd5e3c34517b423cd4fd97ef723849da6b0d2231142d89c00"
+            ],
+            "markers": "python_version >= '2.6'",
+            "version": "==5.5.1"
+        },
+        "pygerrit2": {
+            "hashes": [
+                "sha256:d12cff5cc514dd61281d997ea86771e7f818030c3d2ef230b25bb14dae7d3f86"
+            ],
+            "index": "pypi",
+            "version": "==2.0.14"
+        },
+        "requests": {
+            "hashes": [
+                "sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804",
+                "sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"
+            ],
+            "index": "pypi",
+            "version": "==2.25.1"
+        },
+        "tqdm": {
+            "hashes": [
+                "sha256:38b658a3e4ecf9b4f6f8ff75ca16221ae3378b2e175d846b6b33ea3a20852cf5",
+                "sha256:d4f413aecb61c9779888c64ddf0c62910ad56dcbe857d8922bb505d4dbff0df1"
+            ],
+            "index": "pypi",
+            "version": "==4.54.1"
+        },
+        "urllib3": {
+            "hashes": [
+                "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08",
+                "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
+            "version": "==1.26.2"
+        }
+    },
+    "develop": {
+        "appdirs": {
+            "hashes": [
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
+            ],
+            "version": "==1.4.4"
+        },
+        "black": {
+            "hashes": [
+                "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"
+            ],
+            "index": "pypi",
+            "version": "==20.8b1"
+        },
+        "click": {
+            "hashes": [
+                "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
+                "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==7.1.2"
+        },
+        "flake8": {
+            "hashes": [
+                "sha256:749dbbd6bfd0cf1318af27bf97a14e28e5ff548ef8e5b1566ccfb25a11e7c839",
+                "sha256:aadae8761ec651813c24be05c6f7b4680857ef6afaae4651a4eccaef97ce6c3b"
+            ],
+            "index": "pypi",
+            "version": "==3.8.4"
+        },
+        "mccabe": {
+            "hashes": [
+                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
+                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
+            ],
+            "version": "==0.6.1"
+        },
+        "mypy-extensions": {
+            "hashes": [
+                "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d",
+                "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"
+            ],
+            "version": "==0.4.3"
+        },
+        "pathspec": {
+            "hashes": [
+                "sha256:86379d6b86d75816baba717e64b1a3a3469deb93bb76d613c9ce79edc5cb68fd",
+                "sha256:aa0cb481c4041bf52ffa7b0d8fa6cd3e88a2ca4879c533c9153882ee2556790d"
+            ],
+            "version": "==0.8.1"
+        },
+        "pycodestyle": {
+            "hashes": [
+                "sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367",
+                "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.6.0"
+        },
+        "pyflakes": {
+            "hashes": [
+                "sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92",
+                "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.2.0"
+        },
+        "regex": {
+            "hashes": [
+                "sha256:02951b7dacb123d8ea6da44fe45ddd084aa6777d4b2454fa0da61d569c6fa538",
+                "sha256:0d08e71e70c0237883d0bef12cad5145b84c3705e9c6a588b2a9c7080e5af2a4",
+                "sha256:1862a9d9194fae76a7aaf0150d5f2a8ec1da89e8b55890b1786b8f88a0f619dc",
+                "sha256:1ab79fcb02b930de09c76d024d279686ec5d532eb814fd0ed1e0051eb8bd2daa",
+                "sha256:1fa7ee9c2a0e30405e21031d07d7ba8617bc590d391adfc2b7f1e8b99f46f444",
+                "sha256:262c6825b309e6485ec2493ffc7e62a13cf13fb2a8b6d212f72bd53ad34118f1",
+                "sha256:2a11a3e90bd9901d70a5b31d7dd85114755a581a5da3fc996abfefa48aee78af",
+                "sha256:2c99e97d388cd0a8d30f7c514d67887d8021541b875baf09791a3baad48bb4f8",
+                "sha256:3128e30d83f2e70b0bed9b2a34e92707d0877e460b402faca908c6667092ada9",
+                "sha256:38c8fd190db64f513fe4e1baa59fed086ae71fa45083b6936b52d34df8f86a88",
+                "sha256:3bddc701bdd1efa0d5264d2649588cbfda549b2899dc8d50417e47a82e1387ba",
+                "sha256:4902e6aa086cbb224241adbc2f06235927d5cdacffb2425c73e6570e8d862364",
+                "sha256:49cae022fa13f09be91b2c880e58e14b6da5d10639ed45ca69b85faf039f7a4e",
+                "sha256:56e01daca75eae420bce184edd8bb341c8eebb19dd3bce7266332258f9fb9dd7",
+                "sha256:5862975b45d451b6db51c2e654990c1820523a5b07100fc6903e9c86575202a0",
+                "sha256:6a8ce43923c518c24a2579fda49f093f1397dad5d18346211e46f134fc624e31",
+                "sha256:6c54ce4b5d61a7129bad5c5dc279e222afd00e721bf92f9ef09e4fae28755683",
+                "sha256:6e4b08c6f8daca7d8f07c8d24e4331ae7953333dbd09c648ed6ebd24db5a10ee",
+                "sha256:717881211f46de3ab130b58ec0908267961fadc06e44f974466d1887f865bd5b",
+                "sha256:749078d1eb89484db5f34b4012092ad14b327944ee7f1c4f74d6279a6e4d1884",
+                "sha256:7913bd25f4ab274ba37bc97ad0e21c31004224ccb02765ad984eef43e04acc6c",
+                "sha256:7a25fcbeae08f96a754b45bdc050e1fb94b95cab046bf56b016c25e9ab127b3e",
+                "sha256:83d6b356e116ca119db8e7c6fc2983289d87b27b3fac238cfe5dca529d884562",
+                "sha256:8b882a78c320478b12ff024e81dc7d43c1462aa4a3341c754ee65d857a521f85",
+                "sha256:8f6a2229e8ad946e36815f2a03386bb8353d4bde368fdf8ca5f0cb97264d3b5c",
+                "sha256:9801c4c1d9ae6a70aeb2128e5b4b68c45d4f0af0d1535500884d644fa9b768c6",
+                "sha256:a15f64ae3a027b64496a71ab1f722355e570c3fac5ba2801cafce846bf5af01d",
+                "sha256:a3d748383762e56337c39ab35c6ed4deb88df5326f97a38946ddd19028ecce6b",
+                "sha256:a63f1a07932c9686d2d416fb295ec2c01ab246e89b4d58e5fa468089cab44b70",
+                "sha256:b2b1a5ddae3677d89b686e5c625fc5547c6e492bd755b520de5332773a8af06b",
+                "sha256:b2f4007bff007c96a173e24dcda236e5e83bde4358a557f9ccf5e014439eae4b",
+                "sha256:baf378ba6151f6e272824b86a774326f692bc2ef4cc5ce8d5bc76e38c813a55f",
+                "sha256:bafb01b4688833e099d79e7efd23f99172f501a15c44f21ea2118681473fdba0",
+                "sha256:bba349276b126947b014e50ab3316c027cac1495992f10e5682dc677b3dfa0c5",
+                "sha256:c084582d4215593f2f1d28b65d2a2f3aceff8342aa85afd7be23a9cad74a0de5",
+                "sha256:d1ebb090a426db66dd80df8ca85adc4abfcbad8a7c2e9a5ec7513ede522e0a8f",
+                "sha256:d2d8ce12b7c12c87e41123997ebaf1a5767a5be3ec545f64675388970f415e2e",
+                "sha256:e32f5f3d1b1c663af7f9c4c1e72e6ffe9a78c03a31e149259f531e0fed826512",
+                "sha256:e3faaf10a0d1e8e23a9b51d1900b72e1635c2d5b0e1bea1c18022486a8e2e52d",
+                "sha256:f7d29a6fc4760300f86ae329e3b6ca28ea9c20823df123a2ea8693e967b29917",
+                "sha256:f8f295db00ef5f8bae530fc39af0b40486ca6068733fb860b42115052206466f"
+            ],
+            "version": "==2020.11.13"
+        },
+        "toml": {
+            "hashes": [
+                "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
+                "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
+            ],
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==0.10.2"
+        },
+        "typed-ast": {
+            "hashes": [
+                "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355",
+                "sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919",
+                "sha256:0d8110d78a5736e16e26213114a38ca35cb15b6515d535413b090bd50951556d",
+                "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa",
+                "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652",
+                "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75",
+                "sha256:3742b32cf1c6ef124d57f95be609c473d7ec4c14d0090e5a5e05a15269fb4d0c",
+                "sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01",
+                "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d",
+                "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1",
+                "sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907",
+                "sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c",
+                "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3",
+                "sha256:7e4c9d7658aaa1fc80018593abdf8598bf91325af6af5cce4ce7c73bc45ea53d",
+                "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b",
+                "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614",
+                "sha256:92c325624e304ebf0e025d1224b77dd4e6393f18aab8d829b5b7e04afe9b7a2c",
+                "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb",
+                "sha256:b52ccf7cfe4ce2a1064b18594381bccf4179c2ecf7f513134ec2f993dd4ab395",
+                "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b",
+                "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41",
+                "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6",
+                "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34",
+                "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe",
+                "sha256:d648b8e3bf2fe648745c8ffcee3db3ff903d0817a01a12dd6a6ea7a8f4889072",
+                "sha256:f208eb7aff048f6bea9586e61af041ddf7f9ade7caed625742af423f6bae3298",
+                "sha256:fac11badff8313e23717f3dada86a15389d0708275bddf766cca67a84ead3e91",
+                "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
+                "sha256:fcf135e17cc74dbfbc05894ebca928ffeb23d9790b3167a674921db19082401f",
+                "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
+            ],
+            "version": "==1.4.1"
+        },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918",
+                "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c",
+                "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"
+            ],
+            "version": "==3.7.4.3"
+        }
+    }
+}
diff --git a/contrib/reindex/README.md b/contrib/reindex/README.md
new file mode 100644
index 0000000..acb9588
--- /dev/null
+++ b/contrib/reindex/README.md
@@ -0,0 +1,63 @@
+# Incremental reindexing during upgrade of large gerrit site
+
+In order to shorten the downtime needed to reindex changes during a
+Gerrit upgrade the following strategy can be used:
+
+- index preparation
+  - create a full consistent backup
+  - note down the timestamp when the backup was created (backup-time)
+  - create a complete copy of the production system from the backup
+  - upgrade this copy to the new Gerrit version
+  - online reindex this copy
+- upgrade of the production system
+  - make system unavailable so that users can't reach it anymore
+    e.g. by changing port numbers (downtime starts)
+  - take a full backup
+  - run
+
+    ``` bash
+    ./reindex.py -u gerrit-url -s backup-time
+    ```
+
+    to write the list of changes which have been created or modified
+    since the backup for the index preparation was created to a file
+    "changes-to-reindex.list"
+  - upgrade the production system to the new gerrit version skipping
+    reindexing
+  - copy the bulk of the new index from the copy system to the
+    production system
+  - run
+
+    ``` bash
+    ./reindex.py -u gerrit-url
+    ```
+
+    this reindexes all changes which have been created or modified after
+    the backup was taken reading these changes from the file
+    "changes-to-reindex.list"
+  - smoketest the system
+  - make the production system available to the users again
+    (downtime ends)
+
+## Online help
+
+For help on all available options run
+
+``` bash
+./reindex -h
+```
+
+## Python environment
+
+Prerequisites:
+
+- python 3.9
+- pipenv
+
+Install virtual python environment and run the script
+
+``` bash
+pipenv sync
+pipenv shell
+./reindex <options>
+```
diff --git a/contrib/reindex/reindex.py b/contrib/reindex/reindex.py
new file mode 100755
index 0000000..266f5ec
--- /dev/null
+++ b/contrib/reindex/reindex.py
@@ -0,0 +1,189 @@
+#!/usr/bin/env python3
+from argparse import ArgumentParser, RawTextHelpFormatter
+from itertools import islice
+import getpass
+import logging
+import os
+
+from pygerrit2 import GerritRestAPI, HTTPBasicAuth, HTTPBasicAuthFromNetrc
+from tqdm import tqdm
+
+EPILOG = """\
+To query the list of changes which have been created or modified since the
+given timestamp and write them to a file "changes-to-reindex.list" run
+$ ./reindex.py -u gerrit-url -s timestamp
+
+To reindex the list of changes in file "changes-to-reindex.list" run
+$ ./reindex.py -u gerrit-url
+"""
+
+
+def _parse_options():
+    parser = ArgumentParser(
+        formatter_class=RawTextHelpFormatter,
+        epilog=EPILOG,
+    )
+    parser.add_argument(
+        "-u",
+        "--url",
+        dest="url",
+        help="gerrit url",
+    )
+    parser.add_argument(
+        "-s",
+        "--since",
+        dest="time",
+        help=(
+            "changes modified after the given 'TIME', inclusive. Must be in the\n"
+            "format '2006-01-02[ 15:04:05[.890][ -0700]]', omitting the time defaults\n"
+            "to 00:00:00 and omitting the timezone defaults to UTC."
+        ),
+    )
+    parser.add_argument(
+        "-f",
+        "--file",
+        default="changes-to-reindex.list",
+        dest="file",
+        help=(
+            "file path to store list of changes if --since is given,\n"
+            "otherwise file path to read list of changes from"
+        ),
+    )
+    parser.add_argument(
+        "-c",
+        "--chunk",
+        default=100,
+        dest="chunksize",
+        help="chunk size defining how many changes are reindexed per request",
+        type=int,
+    )
+    parser.add_argument(
+        "--cert",
+        dest="cert",
+        type=str,
+        help="path to file containing custom ca certificates to trust",
+    )
+    parser.add_argument(
+        "-v",
+        "--verbose",
+        dest="verbose",
+        action="store_true",
+        help="verbose debugging output",
+    )
+    parser.add_argument(
+        "-n",
+        "--netrc",
+        default=True,
+        dest="netrc",
+        action="store_true",
+        help=(
+            "read credentials from .netrc, default to environment variables\n"
+            "USERNAME and PASSWORD, otherwise prompt for credentials interactively"
+        ),
+    )
+    return parser.parse_args()
+
+
+def _chunker(iterable, chunksize):
+    it = map(lambda s: s.strip(), iterable)
+    while True:
+        chunk = list(islice(it, chunksize))
+        if not chunk:
+            return
+        yield chunk
+
+
+class Reindexer:
+    """Class for reindexing Gerrit changes"""
+
+    def __init__(self):
+        self.options = _parse_options()
+        self._init_logger()
+        credentials = self._authenticate()
+        if self.options.cert:
+            certs = os.path.expanduser(self.options.cert)
+            self.api = GerritRestAPI(
+                url=self.options.url, auth=credentials, verify=certs
+            )
+        else:
+            self.api = GerritRestAPI(url=self.options.url, auth=credentials)
+
+    def _init_logger(self):
+        self.logger = logging.getLogger("Reindexer")
+        self.logger.setLevel(logging.DEBUG)
+        h = logging.StreamHandler()
+        if self.options.verbose:
+            h.setLevel(logging.DEBUG)
+        else:
+            h.setLevel(logging.INFO)
+        formatter = logging.Formatter("%(message)s")
+        h.setFormatter(formatter)
+        self.logger.addHandler(h)
+
+    def _authenticate(self):
+        username = password = None
+        if self.options.netrc:
+            auth = HTTPBasicAuthFromNetrc(url=self.options.url)
+            username = auth.username
+            password = auth.password
+        if not username:
+            username = os.environ.get("USERNAME")
+        if not password:
+            password = os.environ.get("PASSWORD")
+        while not username:
+            username = input("user: ")
+        while not password:
+            password = getpass.getpass("password: ")
+        auth = HTTPBasicAuth(username, password)
+        return auth
+
+    def _query(self):
+        start = 0
+        more_changes = True
+        while more_changes:
+            query = f"since:{self.options.time}&start={start}&skip-visibility"
+            for change in self.api.get(f"changes/?q={query}"):
+                more_changes = change.get("_more_changes") is not None
+                start += 1
+                yield change.get("_number")
+            break
+
+    def _query_to_file(self):
+        self.logger.debug(
+            f"writing changes since {self.options.time} to file {self.options.file}:"
+        )
+        with open(self.options.file, "w") as output:
+            for id in self._query():
+                self.logger.debug(id)
+                output.write(f"{id}\n")
+
+    def _reindex_chunk(self, chunk):
+        self.logger.debug(f"indexing {chunk}")
+        response = self.api.post(
+            "/config/server/index.changes",
+            chunk,
+        )
+        self.logger.debug(f"response: {response}")
+
+    def _reindex(self):
+        self.logger.debug(f"indexing changes from file {self.options.file}")
+        with open(self.options.file, "r") as f:
+            with tqdm(unit="changes", desc="Indexed") as pbar:
+                for chunk in _chunker(f, self.options.chunksize):
+                    self._reindex_chunk(chunk)
+                    pbar.update(len(chunk))
+
+    def execute(self):
+        if self.options.time:
+            self._query_to_file()
+        else:
+            self._reindex()
+
+
+def main():
+    reindexer = Reindexer()
+    reindexer.execute()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/java/com/google/gerrit/acceptance/AbstractPluginLogFileTest.java b/java/com/google/gerrit/acceptance/AbstractPluginLogFileTest.java
new file mode 100644
index 0000000..60def29
--- /dev/null
+++ b/java/com/google/gerrit/acceptance/AbstractPluginLogFileTest.java
@@ -0,0 +1,112 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance;
+
+import com.google.gerrit.extensions.annotations.Exports;
+import com.google.gerrit.extensions.events.LifecycleListener;
+import com.google.gerrit.extensions.systemstatus.ServerInformation;
+import com.google.gerrit.server.DynamicOptions;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.util.PluginLogFile;
+import com.google.gerrit.server.util.SystemLog;
+import com.google.gerrit.sshd.commands.Query;
+import com.google.inject.AbstractModule;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import com.google.inject.internal.UniqueAnnotations;
+import java.util.Collections;
+import org.apache.log4j.AsyncAppender;
+import org.apache.log4j.Layout;
+import org.apache.log4j.PatternLayout;
+import org.eclipse.jgit.lib.Config;
+import org.kohsuke.args4j.Option;
+
+public class AbstractPluginLogFileTest extends AbstractDaemonTest {
+  protected static class Module extends AbstractModule {
+    @Override
+    public void configure() {
+      bind(com.google.gerrit.server.DynamicOptions.DynamicBean.class)
+          .annotatedWith(Exports.named(Query.class))
+          .to(MyClassNameProvider.class);
+    }
+  }
+
+  protected static class MyClassNameProvider implements DynamicOptions.ModulesClassNamesProvider {
+    @Override
+    public String getClassName() {
+      return "com.google.gerrit.acceptance.AbstractPluginLogFileTest$MyOptions";
+    }
+
+    @Override
+    public Iterable<String> getModulesClassNames() {
+      return Collections.singleton(
+          "com.google.gerrit.acceptance.AbstractPluginLogFileTest$MyOptions$MyOptionsModule");
+    }
+  }
+
+  public static class MyOptions implements DynamicOptions.DynamicBean {
+    @Option(name = "--opt")
+    public boolean opt;
+
+    public static class MyOptionsModule extends AbstractModule {
+      @Override
+      protected void configure() {
+        bind(LifecycleListener.class)
+            .annotatedWith(UniqueAnnotations.create())
+            .to(MyPluginLogFile.class);
+      }
+    }
+  }
+
+  protected static class MyPluginLogFile extends PluginLogFile {
+    protected static final String logName = "test_log";
+
+    @Inject
+    public MyPluginLogFile(MySystemLog mySystemLog, ServerInformation serverInfo) {
+      super(mySystemLog, serverInfo, logName, new PatternLayout("[%d] [%t] %m%n"));
+    }
+  }
+
+  @Singleton
+  protected static class MySystemLog extends SystemLog {
+    protected InvocationCounter invocationCounter;
+
+    @Inject
+    public MySystemLog(SitePaths site, Config config, InvocationCounter invocationCounter) {
+      super(site, config);
+      this.invocationCounter = invocationCounter;
+    }
+
+    @Override
+    public AsyncAppender createAsyncAppender(
+        String name, Layout layout, boolean rotate, boolean forPlugin) {
+      invocationCounter.increment();
+      return super.createAsyncAppender(name, layout, rotate, forPlugin);
+    }
+  }
+
+  @Singleton
+  public static class InvocationCounter {
+    private int counter = 0;
+
+    public int getCounter() {
+      return counter;
+    }
+
+    public synchronized void increment() {
+      counter++;
+    }
+  }
+}
diff --git a/java/com/google/gerrit/acceptance/BUILD b/java/com/google/gerrit/acceptance/BUILD
index db0dc84..28f67b8 100644
--- a/java/com/google/gerrit/acceptance/BUILD
+++ b/java/com/google/gerrit/acceptance/BUILD
@@ -47,6 +47,7 @@
     "//lib/guice",
     "//lib/guice:guice-assistedinject",
     "//lib/guice:guice-servlet",
+    "//lib/log:log4j",
     "//lib/mail",
     "//lib/mina:sshd",
     "//lib:guava",
diff --git a/java/com/google/gerrit/acceptance/ExtensionRegistry.java b/java/com/google/gerrit/acceptance/ExtensionRegistry.java
index 03644a6..5d01dcb 100644
--- a/java/com/google/gerrit/acceptance/ExtensionRegistry.java
+++ b/java/com/google/gerrit/acceptance/ExtensionRegistry.java
@@ -43,6 +43,7 @@
 import com.google.gerrit.server.git.validators.OnSubmitValidationListener;
 import com.google.gerrit.server.git.validators.RefOperationValidationListener;
 import com.google.gerrit.server.logging.PerformanceLogger;
+import com.google.gerrit.server.restapi.change.OnPostReview;
 import com.google.gerrit.server.rules.SubmitRule;
 import com.google.gerrit.server.validators.AccountActivationValidationListener;
 import com.google.gerrit.server.validators.ProjectCreationValidationListener;
@@ -83,6 +84,7 @@
   private final DynamicMap<CapabilityDefinition> capabilityDefinitions;
   private final DynamicMap<PluginProjectPermissionDefinition> pluginProjectPermissionDefinitions;
   private final DynamicMap<ProjectConfigEntry> pluginConfigEntries;
+  private final DynamicSet<OnPostReview> onPostReviews;
 
   @Inject
   ExtensionRegistry(
@@ -113,7 +115,8 @@
       DynamicSet<WorkInProgressStateChangedListener> workInProgressStateChangedListeners,
       DynamicMap<CapabilityDefinition> capabilityDefinitions,
       DynamicMap<PluginProjectPermissionDefinition> pluginProjectPermissionDefinitions,
-      DynamicMap<ProjectConfigEntry> pluginConfigEntries) {
+      DynamicMap<ProjectConfigEntry> pluginConfigEntries,
+      DynamicSet<OnPostReview> onPostReviews) {
     this.accountIndexedListeners = accountIndexedListeners;
     this.changeIndexedListeners = changeIndexedListeners;
     this.groupIndexedListeners = groupIndexedListeners;
@@ -142,6 +145,7 @@
     this.capabilityDefinitions = capabilityDefinitions;
     this.pluginProjectPermissionDefinitions = pluginProjectPermissionDefinitions;
     this.pluginConfigEntries = pluginConfigEntries;
+    this.onPostReviews = onPostReviews;
   }
 
   public Registration newRegistration() {
@@ -270,6 +274,10 @@
       return add(pluginConfigEntries, pluginConfigEntry, exportName);
     }
 
+    public Registration add(OnPostReview onPostReview) {
+      return add(onPostReviews, onPostReview);
+    }
+
     private <T> Registration add(DynamicSet<T> dynamicSet, T extension) {
       return add(dynamicSet, extension, "gerrit");
     }
diff --git a/java/com/google/gerrit/acceptance/WaitUtil.java b/java/com/google/gerrit/acceptance/WaitUtil.java
new file mode 100644
index 0000000..6040f16
--- /dev/null
+++ b/java/com/google/gerrit/acceptance/WaitUtil.java
@@ -0,0 +1,34 @@
+// Copyright (C) 2019 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;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import com.google.common.base.Stopwatch;
+import java.time.Duration;
+import java.util.function.Supplier;
+
+public class WaitUtil {
+  public static void waitUntil(Supplier<Boolean> waitCondition, Duration timeout)
+      throws InterruptedException {
+    Stopwatch stopwatch = Stopwatch.createStarted();
+    while (!waitCondition.get()) {
+      if (stopwatch.elapsed().compareTo(timeout) > 0) {
+        throw new InterruptedException();
+      }
+      MILLISECONDS.sleep(50);
+    }
+  }
+}
diff --git a/java/com/google/gerrit/elasticsearch/AbstractElasticIndex.java b/java/com/google/gerrit/elasticsearch/AbstractElasticIndex.java
index a21f9f5..44a377a 100644
--- a/java/com/google/gerrit/elasticsearch/AbstractElasticIndex.java
+++ b/java/com/google/gerrit/elasticsearch/AbstractElasticIndex.java
@@ -84,6 +84,9 @@
   protected static final String BULK = "_bulk";
   protected static final String MAPPINGS = "mappings";
   protected static final String ORDER = "order";
+  protected static final String DESC_SORT_ORDER = "desc";
+  protected static final String ASC_SORT_ORDER = "asc";
+  protected static final String UNMAPPED_TYPE = "unmapped_type";
   protected static final String SEARCH = "_search";
   protected static final String SETTINGS = "settings";
 
@@ -127,7 +130,6 @@
   private final SitePaths sitePaths;
   private final String indexNameRaw;
 
-  protected final String type;
   protected final ElasticRestClientProvider client;
   protected final String indexName;
   protected final Gson gson;
@@ -147,7 +149,6 @@
     this.indexName = config.getIndexName(indexName, schema.getVersion());
     this.indexNameRaw = indexName;
     this.client = client;
-    this.type = client.adapter().getType();
   }
 
   @Override
@@ -167,7 +168,7 @@
 
   @Override
   public void delete(K id) {
-    String uri = getURI(type, BULK);
+    String uri = getURI(BULK);
     Response response = postRequest(uri, getDeleteActions(id), getRefreshParam());
     int statusCode = response.getStatusLine().getStatusCode();
     if (statusCode != HttpStatus.SC_OK) {
@@ -192,10 +193,8 @@
     }
 
     // Recreate the index.
-    String indexCreationFields = concatJsonString(getSettings(client.adapter()), getMappings());
-    response =
-        performRequest(
-            "PUT", indexName + client.adapter().includeTypeNameParam(), indexCreationFields);
+    String indexCreationFields = concatJsonString(getSettings(), getMappings());
+    response = performRequest("PUT", indexName, indexCreationFields);
     statusCode = response.getStatusLine().getStatusCode();
     if (statusCode != HttpStatus.SC_OK) {
       String error = String.format("Failed to create index %s: %s", indexName, statusCode);
@@ -207,26 +206,20 @@
 
   protected abstract String getMappings();
 
-  private String getSettings(ElasticQueryAdapter adapter) {
-    return gson.toJson(ImmutableMap.of(SETTINGS, ElasticSetting.createSetting(config, adapter)));
+  private String getSettings() {
+    return gson.toJson(ImmutableMap.of(SETTINGS, ElasticSetting.createSetting(config)));
   }
 
   protected abstract String getId(V v);
 
   protected String getMappingsForSingleType(MappingProperties properties) {
-    return getMappingsFor(client.adapter().getType(), properties);
+    return getMappingsFor(properties);
   }
 
-  protected String getMappingsFor(String type, MappingProperties properties) {
+  protected String getMappingsFor(MappingProperties properties) {
     JsonObject mappings = new JsonObject();
 
-    if (client.adapter().omitType()) {
-      mappings.add(MAPPINGS, gson.toJsonTree(properties));
-    } else {
-      JsonObject mappingType = new JsonObject();
-      mappingType.add(type, gson.toJsonTree(properties));
-      mappings.add(MAPPINGS, gson.toJsonTree(mappingType));
-    }
+    mappings.add(MAPPINGS, gson.toJsonTree(properties));
     return gson.toJson(mappings);
   }
 
@@ -298,22 +291,16 @@
 
   protected JsonArray getSortArray(String idFieldName) {
     JsonObject properties = new JsonObject();
-    properties.addProperty(ORDER, "asc");
+    properties.addProperty(ORDER, ASC_SORT_ORDER);
 
     JsonArray sortArray = new JsonArray();
     addNamedElement(idFieldName, properties, sortArray);
     return sortArray;
   }
 
-  protected String getURI(String type, String request) {
+  protected String getURI(String request) {
     try {
-      String encodedIndexName = URLEncoder.encode(indexName, UTF_8.toString());
-      if (SEARCH.equals(request) && client.adapter().omitType()) {
-        return encodedIndexName + "/" + request;
-      }
-      String encodedTypeIfAny =
-          client.adapter().omitType() ? "" : "/" + URLEncoder.encode(type, UTF_8.toString());
-      return encodedIndexName + encodedTypeIfAny + "/" + request;
+      return URLEncoder.encode(indexName, UTF_8.toString()) + "/" + request;
     } catch (UnsupportedEncodingException e) {
       throw new StorageException(e);
     }
@@ -359,12 +346,10 @@
   protected class ElasticQuerySource implements DataSource<V> {
     private final QueryOptions opts;
     private final String search;
-    private final String index;
 
-    ElasticQuerySource(Predicate<V> p, QueryOptions opts, String index, JsonArray sortArray)
+    ElasticQuerySource(Predicate<V> p, QueryOptions opts, JsonArray sortArray)
         throws QueryParseException {
       this.opts = opts;
-      this.index = index;
       QueryBuilder qb = queryBuilder.toQueryBuilder(p);
       SearchSourceBuilder searchSource =
           new SearchSourceBuilder(client.adapter())
@@ -392,7 +377,7 @@
 
     private <T> ResultSet<T> readImpl(Function<JsonObject, T> mapper) {
       try {
-        String uri = getURI(index, SEARCH);
+        String uri = getURI(SEARCH);
         Response response =
             performRequest(HttpPost.METHOD_NAME, uri, search, Collections.emptyMap());
         StatusLine statusLine = response.getStatusLine();
diff --git a/java/com/google/gerrit/elasticsearch/ElasticAccountIndex.java b/java/com/google/gerrit/elasticsearch/ElasticAccountIndex.java
index 33217bd..8967789 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticAccountIndex.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticAccountIndex.java
@@ -77,7 +77,7 @@
         new IndexRequest(getId(as), indexName)
             .add(new UpdateRequest<>(schema, as, ImmutableSet.of()));
 
-    String uri = getURI(type, BULK);
+    String uri = getURI(BULK);
     Response response = postRequest(uri, bulk, getRefreshParam());
     int statusCode = response.getStatusLine().getStatusCode();
     if (statusCode != HttpStatus.SC_OK) {
@@ -99,7 +99,6 @@
     return new ElasticQuerySource(
         p,
         opts.filterFields(o -> IndexUtils.accountFields(o, schema.useLegacyNumericFields())),
-        type,
         sortArray);
   }
 
diff --git a/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java b/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
index fe55eab..969ffa5 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
@@ -14,8 +14,6 @@
 
 package com.google.gerrit.elasticsearch;
 
-import static com.google.gerrit.server.index.change.ChangeIndexRewriter.CLOSED_STATUSES;
-import static com.google.gerrit.server.index.change.ChangeIndexRewriter.OPEN_STATUSES;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Objects.requireNonNull;
 
@@ -24,7 +22,6 @@
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.ListMultimap;
-import com.google.common.collect.Lists;
 import com.google.common.collect.MultimapBuilder;
 import com.google.common.collect.Sets;
 import com.google.gerrit.elasticsearch.ElasticMapping.MappingProperties;
@@ -53,7 +50,6 @@
 import com.google.gerrit.server.index.IndexUtils;
 import com.google.gerrit.server.index.change.ChangeField;
 import com.google.gerrit.server.index.change.ChangeIndex;
-import com.google.gerrit.server.index.change.ChangeIndexRewriter;
 import com.google.gerrit.server.project.SubmitRuleOptions;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gson.JsonArray;
@@ -61,8 +57,10 @@
 import com.google.gson.JsonObject;
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
+import java.sql.Timestamp;
+import java.time.Instant;
+import java.time.format.DateTimeFormatter;
 import java.util.Collections;
-import java.util.List;
 import java.util.Optional;
 import java.util.Set;
 import org.apache.http.HttpStatus;
@@ -86,8 +84,6 @@
   }
 
   private static final String CHANGES = "changes";
-  private static final String OPEN_CHANGES = "open_" + CHANGES;
-  private static final String CLOSED_CHANGES = "closed_" + CHANGES;
 
   private final ChangeMapping mapping;
   private final ChangeData.Factory changeDataFactory;
@@ -120,7 +116,7 @@
     BulkRequest bulk =
         new IndexRequest(getId(cd), indexName).add(new UpdateRequest<>(schema, cd, skipFields));
 
-    String uri = getURI(type, BULK);
+    String uri = getURI(BULK);
     Response response = postRequest(uri, bulk, getRefreshParam());
     int statusCode = response.getStatusLine().getStatusCode();
     if (statusCode != HttpStatus.SC_OK) {
@@ -133,41 +129,29 @@
   @Override
   public DataSource<ChangeData> getSource(Predicate<ChangeData> p, QueryOptions opts)
       throws QueryParseException {
-    Set<Change.Status> statuses = ChangeIndexRewriter.getPossibleStatus(p);
-    List<String> indexes = Lists.newArrayListWithCapacity(2);
-    if (!client.adapter().omitType()) {
-      if (client.adapter().useV6Type()) {
-        if (!Sets.intersection(statuses, OPEN_STATUSES).isEmpty()
-            || !Sets.intersection(statuses, CLOSED_STATUSES).isEmpty()) {
-          indexes.add(ElasticQueryAdapter.V6_TYPE);
-        }
-      } else {
-        if (!Sets.intersection(statuses, OPEN_STATUSES).isEmpty()) {
-          indexes.add(OPEN_CHANGES);
-        }
-        if (!Sets.intersection(statuses, CLOSED_STATUSES).isEmpty()) {
-          indexes.add(CLOSED_CHANGES);
-        }
-      }
-    }
-
     QueryOptions filteredOpts =
         opts.filterFields(o -> IndexUtils.changeFields(o, schema.useLegacyNumericFields()));
-    return new ElasticQuerySource(p, filteredOpts, getURI(indexes), getSortArray());
+    return new ElasticQuerySource(p, filteredOpts, getSortArray());
   }
 
   private JsonArray getSortArray() {
     JsonObject properties = new JsonObject();
-    properties.addProperty(ORDER, "desc");
+    properties.addProperty(ORDER, DESC_SORT_ORDER);
 
     JsonArray sortArray = new JsonArray();
     addNamedElement(ChangeField.UPDATED.getName(), properties, sortArray);
+    addNamedElement(ChangeField.MERGED_ON.getName(), getMergedOnSortOptions(), sortArray);
     addNamedElement(idField.getName(), properties, sortArray);
     return sortArray;
   }
 
-  private String getURI(List<String> types) {
-    return String.join(",", types);
+  private JsonObject getMergedOnSortOptions() {
+    JsonObject sortOptions = new JsonObject();
+    sortOptions.addProperty(ORDER, DESC_SORT_ORDER);
+    // Ignore the sort field if it does not exist in index. Otherwise the search would fail on open
+    // changes, because the corresponding documents do not have mergedOn field.
+    sortOptions.addProperty(UNMAPPED_TYPE, ElasticMapping.TIMESTAMP_FIELD_TYPE);
+    return sortOptions;
   }
 
   @Override
@@ -177,7 +161,7 @@
 
   @Override
   protected String getMappings() {
-    return getMappingsFor(client.adapter().getType(), mapping.changes);
+    return getMappingsFor(mapping.changes);
   }
 
   @Override
@@ -390,6 +374,10 @@
           cd);
     }
 
+    if (fields.contains(ChangeField.MERGED_ON.getName())) {
+      decodeMergedOn(source, cd);
+    }
+
     return cd;
   }
 
@@ -425,4 +413,18 @@
     }
     out.setUnresolvedCommentCount(count.getAsInt());
   }
+
+  private void decodeMergedOn(JsonObject doc, ChangeData out) {
+    JsonElement mergedOnField = doc.get(ChangeField.MERGED_ON.getName());
+
+    Timestamp mergedOn = null;
+    if (mergedOnField != null) {
+      // Parse from ElasticMapping.TIMESTAMP_FIELD_FORMAT.
+      // We currently use built-in ISO-based dateOptionalTime.
+      // https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#built-in-date-formats
+      DateTimeFormatter isoFormatter = DateTimeFormatter.ISO_INSTANT;
+      mergedOn = Timestamp.from(Instant.from(isoFormatter.parse(mergedOnField.getAsString())));
+    }
+    out.setMergedOn(mergedOn);
+  }
 }
diff --git a/java/com/google/gerrit/elasticsearch/ElasticConfiguration.java b/java/com/google/gerrit/elasticsearch/ElasticConfiguration.java
index 35c33cb..c4435297 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticConfiguration.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticConfiguration.java
@@ -26,8 +26,10 @@
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 import org.apache.http.HttpHost;
 import org.eclipse.jgit.lib.Config;
+import org.elasticsearch.client.RestClientBuilder;
 
 @Singleton
 class ElasticConfiguration {
@@ -41,12 +43,16 @@
   static final String KEY_NUMBER_OF_SHARDS = "numberOfShards";
   static final String KEY_NUMBER_OF_REPLICAS = "numberOfReplicas";
   static final String KEY_MAX_RESULT_WINDOW = "maxResultWindow";
+  static final String KEY_CONNECT_TIMEOUT = "connectTimeout";
+  static final String KEY_SOCKET_TIMEOUT = "socketTimeout";
 
   static final String DEFAULT_PORT = "9200";
   static final String DEFAULT_USERNAME = "elastic";
-  static final int DEFAULT_NUMBER_OF_SHARDS = 0;
+  static final int DEFAULT_NUMBER_OF_SHARDS = 1;
   static final int DEFAULT_NUMBER_OF_REPLICAS = 1;
   static final int DEFAULT_MAX_RESULT_WINDOW = 10000;
+  static final int DEFAULT_CONNECT_TIMEOUT = RestClientBuilder.DEFAULT_CONNECT_TIMEOUT_MILLIS;
+  static final int DEFAULT_SOCKET_TIMEOUT = RestClientBuilder.DEFAULT_SOCKET_TIMEOUT_MILLIS;
 
   private final Config cfg;
   private final List<HttpHost> hosts;
@@ -56,6 +62,8 @@
   final int numberOfShards;
   final int numberOfReplicas;
   final int maxResultWindow;
+  final int connectTimeout;
+  final int socketTimeout;
   final String prefix;
 
   @Inject
@@ -74,6 +82,22 @@
         cfg.getInt(SECTION_ELASTICSEARCH, null, KEY_NUMBER_OF_REPLICAS, DEFAULT_NUMBER_OF_REPLICAS);
     this.maxResultWindow =
         cfg.getInt(SECTION_ELASTICSEARCH, null, KEY_MAX_RESULT_WINDOW, DEFAULT_MAX_RESULT_WINDOW);
+    this.connectTimeout =
+        (int)
+            cfg.getTimeUnit(
+                SECTION_ELASTICSEARCH,
+                null,
+                KEY_CONNECT_TIMEOUT,
+                DEFAULT_CONNECT_TIMEOUT,
+                TimeUnit.MILLISECONDS);
+    this.socketTimeout =
+        (int)
+            cfg.getTimeUnit(
+                SECTION_ELASTICSEARCH,
+                null,
+                KEY_SOCKET_TIMEOUT,
+                DEFAULT_SOCKET_TIMEOUT,
+                TimeUnit.MILLISECONDS);
     this.hosts = new ArrayList<>();
     for (String server : cfg.getStringList(SECTION_ELASTICSEARCH, null, KEY_SERVER)) {
       try {
@@ -107,10 +131,7 @@
     return String.format("%s%s_%04d", prefix, name, schemaVersion);
   }
 
-  int getNumberOfShards(ElasticQueryAdapter adapter) {
-    if (numberOfShards == DEFAULT_NUMBER_OF_SHARDS) {
-      return adapter.getDefaultNumberOfShards();
-    }
+  int getNumberOfShards() {
     return numberOfShards;
   }
 }
diff --git a/java/com/google/gerrit/elasticsearch/ElasticGroupIndex.java b/java/com/google/gerrit/elasticsearch/ElasticGroupIndex.java
index a16ec7f..f8c2ec5 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticGroupIndex.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticGroupIndex.java
@@ -77,7 +77,7 @@
         new IndexRequest(getId(group), indexName)
             .add(new UpdateRequest<>(schema, group, ImmutableSet.of()));
 
-    String uri = getURI(type, BULK);
+    String uri = getURI(BULK);
     Response response = postRequest(uri, bulk, getRefreshParam());
     int statusCode = response.getStatusLine().getStatusCode();
     if (statusCode != HttpStatus.SC_OK) {
@@ -92,7 +92,7 @@
   public DataSource<InternalGroup> getSource(Predicate<InternalGroup> p, QueryOptions opts)
       throws QueryParseException {
     JsonArray sortArray = getSortArray(GroupField.UUID.getName());
-    return new ElasticQuerySource(p, opts.filterFields(IndexUtils::groupFields), type, sortArray);
+    return new ElasticQuerySource(p, opts.filterFields(IndexUtils::groupFields), sortArray);
   }
 
   @Override
diff --git a/java/com/google/gerrit/elasticsearch/ElasticMapping.java b/java/com/google/gerrit/elasticsearch/ElasticMapping.java
index f8c4168..edd05c9 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticMapping.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticMapping.java
@@ -21,6 +21,10 @@
 import java.util.Map;
 
 class ElasticMapping {
+
+  protected static final String TIMESTAMP_FIELD_TYPE = "date";
+  protected static final String TIMESTAMP_FIELD_FORMAT = "dateOptionalTime";
+
   static MappingProperties createMapping(Schema<?> schema, ElasticQueryAdapter adapter) {
     ElasticMapping.Builder mapping = new ElasticMapping.Builder(adapter);
     for (FieldDef<?, ?> field : schema.getFields().values()) {
@@ -71,9 +75,9 @@
     }
 
     Builder addTimestamp(String name) {
-      FieldProperties properties = new FieldProperties("date");
-      properties.type = "date";
-      properties.format = "dateOptionalTime";
+      FieldProperties properties = new FieldProperties(TIMESTAMP_FIELD_TYPE);
+      properties.type = TIMESTAMP_FIELD_TYPE;
+      properties.format = TIMESTAMP_FIELD_FORMAT;
       fields.put(name, properties);
       return this;
     }
diff --git a/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java b/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java
index ed15e34..b8bfc38 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java
@@ -79,7 +79,7 @@
         new IndexRequest(projectState.getProject().getName(), indexName)
             .add(new UpdateRequest<>(schema, projectState, ImmutableSet.of()));
 
-    String uri = getURI(type, BULK);
+    String uri = getURI(BULK);
     Response response = postRequest(uri, bulk, getRefreshParam());
     int statusCode = response.getStatusLine().getStatusCode();
     if (statusCode != HttpStatus.SC_OK) {
@@ -94,7 +94,7 @@
   public DataSource<ProjectData> getSource(Predicate<ProjectData> p, QueryOptions opts)
       throws QueryParseException {
     JsonArray sortArray = getSortArray(ProjectField.NAME.getName());
-    return new ElasticQuerySource(p, opts.filterFields(IndexUtils::projectFields), type, sortArray);
+    return new ElasticQuerySource(p, opts.filterFields(IndexUtils::projectFields), sortArray);
   }
 
   @Override
diff --git a/java/com/google/gerrit/elasticsearch/ElasticQueryAdapter.java b/java/com/google/gerrit/elasticsearch/ElasticQueryAdapter.java
index 779d433..19d9901 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticQueryAdapter.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticQueryAdapter.java
@@ -14,42 +14,23 @@
 
 package com.google.gerrit.elasticsearch;
 
-import static com.google.gerrit.elasticsearch.ElasticVersion.V6_8;
-
 public class ElasticQueryAdapter {
-  static final String V6_TYPE = "_doc";
-
-  private static final String INCLUDE_TYPE = "include_type_name=true";
   private static final String INDICES = "?allow_no_indices=false";
 
-  private final boolean useV6Type;
-  private final boolean omitType;
-  private final int defaultNumberOfShards;
-
   private final String searchFilteringName;
-  private final String indicesExistParams;
   private final String exactFieldType;
   private final String stringFieldType;
   private final String indexProperty;
   private final String rawFieldsKey;
   private final String versionDiscoveryUrl;
-  private final String includeTypeNameParam;
 
-  ElasticQueryAdapter(ElasticVersion version) {
-    this.useV6Type = version.isV6();
-    this.omitType = version.isV7OrLater();
-    this.defaultNumberOfShards = version.isV7OrLater() ? 1 : 5;
-    this.versionDiscoveryUrl = version.isV6OrLater() ? "/%s*" : "/%s*/_aliases";
+  ElasticQueryAdapter() {
+    this.versionDiscoveryUrl = "/%s*";
     this.searchFilteringName = "_source";
     this.exactFieldType = "keyword";
     this.stringFieldType = "text";
     this.indexProperty = "true";
     this.rawFieldsKey = "_source";
-
-    // Since v6.7 (end-of-life), in fact, for these two parameters:
-    this.indicesExistParams =
-        version.isAtLeastMinorVersion(V6_8) ? INDICES + "&" + INCLUDE_TYPE : INDICES;
-    this.includeTypeNameParam = version.isAtLeastMinorVersion(V6_8) ? "?" + INCLUDE_TYPE : "";
   }
 
   public String searchFilteringName() {
@@ -57,7 +38,7 @@
   }
 
   String indicesExistParams() {
-    return indicesExistParams;
+    return INDICES;
   }
 
   String exactFieldType() {
@@ -76,27 +57,7 @@
     return rawFieldsKey;
   }
 
-  boolean useV6Type() {
-    return useV6Type;
-  }
-
-  boolean omitType() {
-    return omitType;
-  }
-
-  int getDefaultNumberOfShards() {
-    return defaultNumberOfShards;
-  }
-
-  String getType() {
-    return useV6Type() ? V6_TYPE : "";
-  }
-
   String getVersionDiscoveryUrl(String name) {
     return String.format(versionDiscoveryUrl, name);
   }
-
-  String includeTypeNameParam() {
-    return includeTypeNameParam;
-  }
 }
diff --git a/java/com/google/gerrit/elasticsearch/ElasticQueryBuilder.java b/java/com/google/gerrit/elasticsearch/ElasticQueryBuilder.java
index d05e91c..40ac603 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticQueryBuilder.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticQueryBuilder.java
@@ -29,7 +29,6 @@
 import com.google.gerrit.index.query.QueryParseException;
 import com.google.gerrit.index.query.RegexPredicate;
 import com.google.gerrit.index.query.TimestampRangePredicate;
-import com.google.gerrit.server.query.change.AfterPredicate;
 import java.time.Instant;
 
 public class ElasticQueryBuilder {
@@ -130,7 +129,9 @@
   private <T> QueryBuilder timestampQuery(IndexPredicate<T> p) throws QueryParseException {
     if (p instanceof TimestampRangePredicate) {
       TimestampRangePredicate<T> r = (TimestampRangePredicate<T>) p;
-      if (p instanceof AfterPredicate) {
+      if (r.getMaxTimestamp().getTime() == Long.MAX_VALUE) {
+        // The time range only has the start value, search from the start to the max supported value
+        // Long.MAX_VALUE
         return QueryBuilders.rangeQuery(r.getField().getName())
             .gte(Instant.ofEpochMilli(r.getMinTimestamp().getTime()));
       }
diff --git a/java/com/google/gerrit/elasticsearch/ElasticRestClientProvider.java b/java/com/google/gerrit/elasticsearch/ElasticRestClientProvider.java
index a67de44..b41f365 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticRestClientProvider.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticRestClientProvider.java
@@ -27,6 +27,7 @@
 import org.apache.http.auth.AuthScope;
 import org.apache.http.auth.UsernamePasswordCredentials;
 import org.apache.http.client.CredentialsProvider;
+import org.apache.http.client.config.RequestConfig;
 import org.apache.http.impl.client.BasicCredentialsProvider;
 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
 import org.elasticsearch.client.Request;
@@ -65,7 +66,7 @@
           client = build();
           ElasticVersion version = getVersion();
           logger.atInfo().log("Elasticsearch integration version %s", version);
-          adapter = new ElasticQueryAdapter(version);
+          adapter = new ElasticQueryAdapter();
         }
       }
     }
@@ -128,10 +129,19 @@
 
   private RestClient build() {
     RestClientBuilder builder = RestClient.builder(cfg.getHosts());
+    setConfiguredTimeouts(builder);
     setConfiguredCredentialsIfAny(builder);
     return builder.build();
   }
 
+  private void setConfiguredTimeouts(RestClientBuilder builder) {
+    builder.setRequestConfigCallback(
+        (RequestConfig.Builder requestConfigBuilder) ->
+            requestConfigBuilder
+                .setConnectTimeout(cfg.connectTimeout)
+                .setSocketTimeout(cfg.socketTimeout));
+  }
+
   private void setConfiguredCredentialsIfAny(RestClientBuilder builder) {
     String username = cfg.username;
     String password = cfg.password;
diff --git a/java/com/google/gerrit/elasticsearch/ElasticSetting.java b/java/com/google/gerrit/elasticsearch/ElasticSetting.java
index e016efb..7ec0566 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticSetting.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticSetting.java
@@ -22,18 +22,18 @@
   private static final ImmutableMap<String, String> CUSTOM_CHAR_MAPPING =
       ImmutableMap.of("\\u002E", "\\u0020", "\\u005F", "\\u0020");
 
-  static SettingProperties createSetting(ElasticConfiguration config, ElasticQueryAdapter adapter) {
-    return new ElasticSetting.Builder().addCharFilter().addAnalyzer().build(config, adapter);
+  static SettingProperties createSetting(ElasticConfiguration config) {
+    return new ElasticSetting.Builder().addCharFilter().addAnalyzer().build(config);
   }
 
   static class Builder {
     private final ImmutableMap.Builder<String, FieldProperties> fields =
         new ImmutableMap.Builder<>();
 
-    SettingProperties build(ElasticConfiguration config, ElasticQueryAdapter adapter) {
+    SettingProperties build(ElasticConfiguration config) {
       SettingProperties properties = new SettingProperties();
       properties.analysis = fields.build();
-      properties.numberOfShards = config.getNumberOfShards(adapter);
+      properties.numberOfShards = config.getNumberOfShards();
       properties.numberOfReplicas = config.numberOfReplicas;
       properties.maxResultWindow = config.maxResultWindow;
       return properties;
diff --git a/java/com/google/gerrit/elasticsearch/ElasticVersion.java b/java/com/google/gerrit/elasticsearch/ElasticVersion.java
index b3f1471..bba1577 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticVersion.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticVersion.java
@@ -18,9 +18,6 @@
 import java.util.regex.Pattern;
 
 public enum ElasticVersion {
-  V6_8("6.8.*"),
-  V7_0("7.0.*"),
-  V7_1("7.1.*"),
   V7_2("7.2.*"),
   V7_3("7.3.*"),
   V7_4("7.4.*"),
@@ -67,34 +64,6 @@
     return Joiner.on(", ").join(ElasticVersion.values());
   }
 
-  public boolean isV6() {
-    return getMajor() == 6;
-  }
-
-  public boolean isV6OrLater() {
-    return isAtLeastVersion(6);
-  }
-
-  public boolean isV7OrLater() {
-    return isAtLeastVersion(7);
-  }
-
-  private boolean isAtLeastVersion(int major) {
-    return getMajor() >= major;
-  }
-
-  public boolean isAtLeastMinorVersion(ElasticVersion version) {
-    return getMajor().equals(version.getMajor()) && getMinor() >= version.getMinor();
-  }
-
-  private Integer getMajor() {
-    return Integer.valueOf(version.split("\\.")[0]);
-  }
-
-  private Integer getMinor() {
-    return Integer.valueOf(version.split("\\.")[1]);
-  }
-
   @Override
   public String toString() {
     return version;
diff --git a/java/com/google/gerrit/entities/RefNames.java b/java/com/google/gerrit/entities/RefNames.java
index 5595bc7..522c60a 100644
--- a/java/com/google/gerrit/entities/RefNames.java
+++ b/java/com/google/gerrit/entities/RefNames.java
@@ -14,6 +14,7 @@
 
 package com.google.gerrit.entities;
 
+import com.google.common.collect.ImmutableList;
 import com.google.gerrit.common.UsedAt;
 
 /** Constants and utilities for Gerrit-specific ref names. */
@@ -105,6 +106,26 @@
   /** A change starred by a user */
   public static final String REFS_STARRED_CHANGES = "refs/starred-changes/";
 
+  /**
+   * List of refs managed by Gerrit. Covers all Gerrit internal refs.
+   *
+   * <p><b>Caution</b> Any ref not in this list will be served if the user was granted a READ
+   * permission on it using Gerrit's permission model.
+   */
+  public static final ImmutableList<String> GERRIT_REFS =
+      ImmutableList.of(
+          REFS_CHANGES,
+          REFS_EXTERNAL_IDS,
+          REFS_CACHE_AUTOMERGE,
+          REFS_DRAFT_COMMENTS,
+          REFS_DELETED_GROUPS,
+          REFS_SEQUENCES,
+          REFS_GROUPS,
+          REFS_GROUPNAMES,
+          REFS_USERS,
+          REFS_STARRED_CHANGES,
+          REFS_REJECT_COMMITS);
+
   public static String fullName(String ref) {
     return (ref.startsWith(REFS) || ref.equals(HEAD)) ? ref : REFS_HEADS + ref;
   }
@@ -255,6 +276,10 @@
     return ref.startsWith(REFS_USERS);
   }
 
+  public static boolean isRefsUsersSelf(String ref, boolean isAllUsers) {
+    return isAllUsers && REFS_USERS_SELF.equals(ref);
+  }
+
   /**
    * Whether the ref is a group branch that stores NoteDb data of a group. Returns {@code true} for
    * all refs that start with {@code refs/groups/}.
@@ -271,6 +296,16 @@
     return ref.startsWith(REFS_DELETED_GROUPS);
   }
 
+  /** Returns true if the provided ref is for draft comments. */
+  public static boolean isRefsDraftsComments(String ref) {
+    return ref.startsWith(REFS_DRAFT_COMMENTS);
+  }
+
+  /** Returns true if the provided ref is for starred changes. */
+  public static boolean isRefsStarredChanges(String ref) {
+    return ref.startsWith(REFS_STARRED_CHANGES);
+  }
+
   /**
    * Whether the ref is used for storing group data in NoteDb. Returns {@code true} for all group
    * branches, refs/meta/group-names and deleted group branches.
@@ -292,21 +327,11 @@
    * <p>Any ref for which this method evaluates to true will be served to users who have the {@code
    * ACCESS_DATABASE} capability.
    *
-   * <p><b>Caution</b>Any ref not in this list will be served if the user was granted a READ
+   * <p><b>Caution</b> Any ref not in this list will be served if the user was granted a READ
    * permission on it using Gerrit's permission model.
    */
   public static boolean isGerritRef(String ref) {
-    return ref.startsWith(REFS_CHANGES)
-        || ref.startsWith(REFS_EXTERNAL_IDS)
-        || ref.startsWith(REFS_CACHE_AUTOMERGE)
-        || ref.startsWith(REFS_DRAFT_COMMENTS)
-        || ref.startsWith(REFS_DELETED_GROUPS)
-        || ref.startsWith(REFS_SEQUENCES)
-        || ref.startsWith(REFS_GROUPS)
-        || ref.startsWith(REFS_GROUPNAMES)
-        || ref.startsWith(REFS_USERS)
-        || ref.startsWith(REFS_STARRED_CHANGES)
-        || ref.startsWith(REFS_REJECT_COMMITS);
+    return GERRIT_REFS.stream().anyMatch(internalRef -> ref.startsWith(internalRef));
   }
 
   static Integer parseShardedRefPart(String name) {
diff --git a/java/com/google/gerrit/extensions/api/changes/MoveInput.java b/java/com/google/gerrit/extensions/api/changes/MoveInput.java
index 795642a..3d82990 100644
--- a/java/com/google/gerrit/extensions/api/changes/MoveInput.java
+++ b/java/com/google/gerrit/extensions/api/changes/MoveInput.java
@@ -17,4 +17,14 @@
 public class MoveInput {
   public String message;
   public String destinationBranch;
+  /**
+   * Whether or not to keep all votes in the destination branch. Keeping the votes can be confusing
+   * in the context of the destination branch, see
+   * https://gerrit-review.googlesource.com/c/gerrit/+/129171. That is why only the users with
+   * {@link com.google.gerrit.server.permissions.GlobalPermission#ADMINISTRATE_SERVER} permissions
+   * can use this option.
+   *
+   * <p>By default, only the veto votes that are blocking the change from submission are moved.
+   */
+  public boolean keepAllVotes;
 }
diff --git a/java/com/google/gerrit/extensions/api/changes/ReviewInput.java b/java/com/google/gerrit/extensions/api/changes/ReviewInput.java
index 7ecc0a6..fd445b6 100644
--- a/java/com/google/gerrit/extensions/api/changes/ReviewInput.java
+++ b/java/com/google/gerrit/extensions/api/changes/ReviewInput.java
@@ -21,9 +21,11 @@
 import com.google.gerrit.extensions.common.FixSuggestionInfo;
 import com.google.gerrit.extensions.restapi.DefaultInput;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 /** Input passed to {@code POST /changes/[id]/revisions/[id]/review}. */
 public class ReviewInput {
@@ -117,6 +119,15 @@
     return this;
   }
 
+  public ReviewInput patchSetLevelComment(String message) {
+    Objects.requireNonNull(message);
+    CommentInput comment = new CommentInput();
+    comment.message = message;
+    // TODO(davido): Because of cyclic dependency, we cannot use here Patch.PATCHSET_LEVEL constant
+    comments = Collections.singletonMap("/PATCHSET_LEVEL", Collections.singletonList(comment));
+    return this;
+  }
+
   public ReviewInput label(String name, short value) {
     if (name == null || name.isEmpty()) {
       throw new IllegalArgumentException();
diff --git a/java/com/google/gerrit/extensions/webui/ParentWebLink.java b/java/com/google/gerrit/extensions/webui/ParentWebLink.java
index 2176e78..9f2bc6e 100644
--- a/java/com/google/gerrit/extensions/webui/ParentWebLink.java
+++ b/java/com/google/gerrit/extensions/webui/ParentWebLink.java
@@ -32,11 +32,11 @@
    *
    * @param projectName name of the project
    * @param commit commit sha1 of the parent revision
-   * @param subject first line of the commit message
+   * @param commitMessage the commit messsage of the change
    * @param branchName target branch of the change
    * @return WebLinkInfo that links to parent commit in external service, null if there should be no
    *     link.
    */
   WebLinkInfo getParentWebLink(
-      String projectName, String commit, String subject, String branchName);
+      String projectName, String commit, String commitMessage, String branchName);
 }
diff --git a/java/com/google/gerrit/extensions/webui/PatchSetWebLink.java b/java/com/google/gerrit/extensions/webui/PatchSetWebLink.java
index b8ba5c4..0e8e28e 100644
--- a/java/com/google/gerrit/extensions/webui/PatchSetWebLink.java
+++ b/java/com/google/gerrit/extensions/webui/PatchSetWebLink.java
@@ -32,11 +32,11 @@
    *
    * @param projectName name of the project
    * @param commit commit of the patch set
-   * @param subject first line of the commit message
+   * @param commitMessage the commit message of the change
    * @param branchName target branch of the change
    * @return WebLinkInfo that links to patch set in external service, null if there should be no
    *     link.
    */
   WebLinkInfo getPatchSetWebLink(
-      String projectName, String commit, String subject, String branchName);
+      String projectName, String commit, String commitMessage, String branchName);
 }
diff --git a/java/com/google/gerrit/httpd/HttpLogoutServlet.java b/java/com/google/gerrit/httpd/HttpLogoutServlet.java
index 1eaaba3..b56f973 100644
--- a/java/com/google/gerrit/httpd/HttpLogoutServlet.java
+++ b/java/com/google/gerrit/httpd/HttpLogoutServlet.java
@@ -73,11 +73,10 @@
 
   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
-
-    final String sid = webSession.get().getSessionId();
-    final CurrentUser currentUser = webSession.get().getUser();
-    final String what = "sign out";
-    final long when = TimeUtil.nowMs();
+    String sid = webSession.get().getSessionId();
+    CurrentUser currentUser = webSession.get().getUser();
+    String what = "sign out";
+    long when = TimeUtil.nowMs();
 
     try {
       doLogout(req, rsp);
diff --git a/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java b/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
index 77d02c1..46dde41 100644
--- a/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
+++ b/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
@@ -20,6 +20,7 @@
 
 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;
@@ -37,15 +38,21 @@
 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
@@ -53,6 +60,7 @@
    */
   public static ImmutableMap<String, Object> templateData(
       GerritApi gerritApi,
+      Config gerritServerConfig,
       String canonicalURL,
       String cdnPath,
       String faviconPath,
@@ -66,7 +74,13 @@
                 canonicalURL, cdnPath, faviconPath, urlParameterMap, urlInScriptTagOrdainer))
         .putAll(dynamicTemplateData(gerritApi, requestedURL));
 
-    Set<String> enabledExperiments = experimentData(urlParameterMap);
+    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 97d2270..b2bdf7c 100644
--- a/java/com/google/gerrit/httpd/raw/IndexServlet.java
+++ b/java/com/google/gerrit/httpd/raw/IndexServlet.java
@@ -34,6 +34,7 @@
 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;
@@ -42,6 +43,7 @@
   @Nullable private final String cdnPath;
   @Nullable private final String faviconPath;
   private final GerritApi gerritApi;
+  private final Config gerritServerConfig;
   private final SoySauce soySauce;
   private final Function<String, SanitizedContent> urlOrdainer;
 
@@ -49,11 +51,13 @@
       @Nullable String canonicalUrl,
       @Nullable String cdnPath,
       @Nullable String faviconPath,
-      GerritApi gerritApi) {
+      GerritApi gerritApi,
+      Config gerritServerConfig) {
     this.canonicalUrl = canonicalUrl;
     this.cdnPath = cdnPath;
     this.faviconPath = faviconPath;
     this.gerritApi = gerritApi;
+    this.gerritServerConfig = gerritServerConfig;
     this.soySauce =
         SoyFileSet.builder()
             .add(Resources.getResource("com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy"))
@@ -74,7 +78,14 @@
       // TODO(hiesel): Remove URL ordainer as parameter once Soy is consistent
       ImmutableMap<String, Object> templateData =
           IndexHtmlUtil.templateData(
-              gerritApi, canonicalUrl, cdnPath, faviconPath, parameterMap, urlOrdainer, requestUrl);
+              gerritApi,
+              gerritServerConfig,
+              canonicalUrl,
+              cdnPath,
+              faviconPath,
+              parameterMap,
+              urlOrdainer,
+              requestUrl);
       renderer = soySauce.renderTemplate("com.google.gerrit.httpd.raw.Index").setData(templateData);
     } catch (URISyntaxException | RestApiException e) {
       throw new IOException(e);
diff --git a/java/com/google/gerrit/httpd/raw/StaticModule.java b/java/com/google/gerrit/httpd/raw/StaticModule.java
index 4b2c8a9..66e107b 100644
--- a/java/com/google/gerrit/httpd/raw/StaticModule.java
+++ b/java/com/google/gerrit/httpd/raw/StaticModule.java
@@ -225,7 +225,7 @@
       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);
+      return new IndexServlet(canonicalUrl, cdnPath, faviconPath, gerritApi, cfg);
     }
 
     @Provides
diff --git a/java/com/google/gerrit/httpd/restapi/ParameterParser.java b/java/com/google/gerrit/httpd/restapi/ParameterParser.java
index 326cab8..3ab409e 100644
--- a/java/com/google/gerrit/httpd/restapi/ParameterParser.java
+++ b/java/com/google/gerrit/httpd/restapi/ParameterParser.java
@@ -43,6 +43,7 @@
 import com.google.gson.JsonObject;
 import com.google.gson.JsonPrimitive;
 import com.google.inject.Inject;
+import com.google.inject.Singleton;
 import java.io.IOException;
 import java.io.StringWriter;
 import java.util.HashSet;
@@ -153,6 +154,12 @@
     this.parserFactory = pf;
   }
 
+  /**
+   * Parses query parameters ({@code in}) into annotated option fields of {@code param}.
+   *
+   * @return true if parsing was successful. Requesting help is considered failure and returns
+   *     false.
+   */
   <T> boolean parse(
       T param,
       DynamicOptions pluginOptions,
@@ -160,6 +167,10 @@
       HttpServletRequest req,
       HttpServletResponse res)
       throws IOException {
+    if (param.getClass().getAnnotation(Singleton.class) != null) {
+      // Command-line parsing mutates the object, so we can't have options on @Singleton.
+      return true;
+    }
     CmdLineParser clp = parserFactory.create(param);
     pluginOptions.setBean(param);
     pluginOptions.startLifecycleListeners();
diff --git a/java/com/google/gerrit/httpd/restapi/RestApiServlet.java b/java/com/google/gerrit/httpd/restapi/RestApiServlet.java
index 0e525ce..51e032a 100644
--- a/java/com/google/gerrit/httpd/restapi/RestApiServlet.java
+++ b/java/com/google/gerrit/httpd/restapi/RestApiServlet.java
@@ -1348,7 +1348,7 @@
     TemporaryBuffer.Heap buf = heap(HEAP_EST_SIZE, Integer.MAX_VALUE);
     buf.write(JSON_MAGIC);
     Writer w = new BufferedWriter(new OutputStreamWriter(buf, UTF_8));
-    Gson gson = newGson(config, req);
+    Gson gson = newGson(config);
     if (result instanceof JsonElement) {
       gson.toJson((JsonElement) result, w);
     } else {
@@ -1375,25 +1375,18 @@
         req, res, asBinaryResult(buf).setContentType(JSON_TYPE).setCharacterEncoding(UTF_8));
   }
 
-  private static Gson newGson(
-      ListMultimap<String, String> config, @Nullable HttpServletRequest req) {
+  private static Gson newGson(ListMultimap<String, String> config) {
     GsonBuilder gb = OutputFormat.JSON_COMPACT.newGsonBuilder();
 
-    enablePrettyPrint(gb, config, req);
+    enablePrettyPrint(gb, config);
     enablePartialGetFields(gb, config);
 
     return gb.create();
   }
 
-  private static void enablePrettyPrint(
-      GsonBuilder gb, ListMultimap<String, String> config, @Nullable HttpServletRequest req) {
-    String pp = Iterables.getFirst(config.get("pp"), null);
-    if (pp == null) {
-      pp = Iterables.getFirst(config.get("prettyPrint"), null);
-      if (pp == null && req != null) {
-        pp = acceptsJson(req) ? "0" : "1";
-      }
-    }
+  private static void enablePrettyPrint(GsonBuilder gb, ListMultimap<String, String> config) {
+    String pp =
+        Iterables.getFirst(config.get("pp"), Iterables.getFirst(config.get("prettyPrint"), "0"));
     if ("1".equals(pp) || "true".equals(pp)) {
       gb.setPrettyPrinting();
     }
@@ -1903,10 +1896,6 @@
     return CharMatcher.anyOf("<&").matchesAnyOf(text);
   }
 
-  private static boolean acceptsJson(HttpServletRequest req) {
-    return req != null && isType(JSON_TYPE, req.getHeader(HttpHeaders.ACCEPT));
-  }
-
   private static boolean acceptsGzip(HttpServletRequest req) {
     if (req != null) {
       String accepts = req.getHeader(HttpHeaders.ACCEPT_ENCODING);
diff --git a/java/com/google/gerrit/index/query/TimestampRangePredicate.java b/java/com/google/gerrit/index/query/TimestampRangePredicate.java
index 38b2b73..42f8aa8 100644
--- a/java/com/google/gerrit/index/query/TimestampRangePredicate.java
+++ b/java/com/google/gerrit/index/query/TimestampRangePredicate.java
@@ -34,6 +34,10 @@
     super(def, name, value);
   }
 
+  protected Timestamp getValueTimestamp(I object) {
+    return (Timestamp) this.getField().get(object);
+  }
+
   public abstract Date getMinTimestamp();
 
   public abstract Date getMaxTimestamp();
diff --git a/java/com/google/gerrit/lucene/ChangeSubIndex.java b/java/com/google/gerrit/lucene/ChangeSubIndex.java
index e51a91a7..43daf25 100644
--- a/java/com/google/gerrit/lucene/ChangeSubIndex.java
+++ b/java/com/google/gerrit/lucene/ChangeSubIndex.java
@@ -17,6 +17,7 @@
 import static com.google.common.collect.Iterables.getOnlyElement;
 import static com.google.gerrit.lucene.LuceneChangeIndex.ID2_SORT_FIELD;
 import static com.google.gerrit.lucene.LuceneChangeIndex.ID_SORT_FIELD;
+import static com.google.gerrit.lucene.LuceneChangeIndex.MERGED_ON_SORT_FIELD;
 import static com.google.gerrit.lucene.LuceneChangeIndex.UPDATED_SORT_FIELD;
 import static com.google.gerrit.server.index.change.ChangeSchemaDefinitions.NAME;
 
@@ -110,6 +111,9 @@
     } else if (f == ChangeField.UPDATED) {
       long t = ((Timestamp) getOnlyElement(values.getValues())).getTime();
       doc.add(new NumericDocValuesField(UPDATED_SORT_FIELD, t));
+    } else if (f == ChangeField.MERGED_ON) {
+      long t = ((Timestamp) getOnlyElement(values.getValues())).getTime();
+      doc.add(new NumericDocValuesField(MERGED_ON_SORT_FIELD, t));
     }
     super.add(doc, values);
   }
diff --git a/java/com/google/gerrit/lucene/LuceneChangeIndex.java b/java/com/google/gerrit/lucene/LuceneChangeIndex.java
index bf1a166..f4b9e69 100644
--- a/java/com/google/gerrit/lucene/LuceneChangeIndex.java
+++ b/java/com/google/gerrit/lucene/LuceneChangeIndex.java
@@ -72,6 +72,7 @@
 import com.google.protobuf.MessageLite;
 import java.io.IOException;
 import java.nio.file.Path;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Iterator;
@@ -110,6 +111,7 @@
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
 
   static final String UPDATED_SORT_FIELD = sortFieldName(ChangeField.UPDATED);
+  static final String MERGED_ON_SORT_FIELD = sortFieldName(ChangeField.MERGED_ON);
   static final String ID_SORT_FIELD = sortFieldName(ChangeField.LEGACY_ID);
   static final String ID2_SORT_FIELD = sortFieldName(ChangeField.LEGACY_ID_STR);
 
@@ -140,6 +142,7 @@
   private static final String UNRESOLVED_COMMENT_COUNT_FIELD =
       ChangeField.UNRESOLVED_COMMENT_COUNT.getName();
   private static final String ATTENTION_SET_FULL_FIELD = ChangeField.ATTENTION_SET_FULL.getName();
+  private static final String MERGED_ON_FIELD = ChangeField.MERGED_ON.getName();
 
   @FunctionalInterface
   static interface IdTerm {
@@ -320,6 +323,7 @@
   private Sort getSort() {
     return new Sort(
         new SortField(UPDATED_SORT_FIELD, SortField.Type.LONG, true),
+        new SortField(MERGED_ON_SORT_FIELD, SortField.Type.LONG, true),
         new SortField(idSortFieldName, SortField.Type.LONG, true));
   }
 
@@ -563,6 +567,9 @@
     if (fields.contains(REF_STATE_PATTERN_FIELD)) {
       decodeRefStatePatterns(doc, cd);
     }
+    if (fields.contains(MERGED_ON_FIELD)) {
+      decodeMergedOn(doc, cd);
+    }
 
     decodeUnresolvedCommentCount(doc, cd);
     decodeTotalCommentCount(doc, cd);
@@ -719,6 +726,16 @@
     }
   }
 
+  private void decodeMergedOn(ListMultimap<String, IndexableField> doc, ChangeData cd) {
+    IndexableField mergedOnField =
+        Iterables.getFirst(doc.get(MERGED_ON_FIELD), /* defaultValue= */ null);
+    Timestamp mergedOn = null;
+    if (mergedOnField != null && mergedOnField.numericValue() != null) {
+      mergedOn = new Timestamp(mergedOnField.numericValue().longValue());
+    }
+    cd.setMergedOn(mergedOn);
+  }
+
   private static <T> List<T> decodeProtos(
       ListMultimap<String, IndexableField> doc, String fieldName, ProtoConverter<?, T> converter) {
     return doc.get(fieldName).stream()
diff --git a/java/com/google/gerrit/pgm/init/InitJGitConfig.java b/java/com/google/gerrit/pgm/init/InitJGitConfig.java
new file mode 100644
index 0000000..6e37f7f
--- /dev/null
+++ b/java/com/google/gerrit/pgm/init/InitJGitConfig.java
@@ -0,0 +1,102 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.pgm.init;
+
+import static com.google.gerrit.pgm.init.api.InitUtil.die;
+
+import com.google.gerrit.pgm.init.api.ConsoleUI;
+import com.google.gerrit.pgm.init.api.InitStep;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import org.eclipse.jgit.errors.ConfigInvalidException;
+import org.eclipse.jgit.lib.ConfigConstants;
+import org.eclipse.jgit.storage.file.FileBasedConfig;
+import org.eclipse.jgit.transport.TransferConfig;
+import org.eclipse.jgit.util.FS;
+
+/** Initialize the JGit configuration. */
+@Singleton
+class InitJGitConfig implements InitStep {
+  private final ConsoleUI ui;
+  private final SitePaths sitePaths;
+
+  @Inject
+  InitJGitConfig(ConsoleUI ui, SitePaths sitePaths) {
+    this.ui = ui;
+    this.sitePaths = sitePaths;
+  }
+
+  @Override
+  public void run() {
+    ui.header("JGit Configuration");
+    FileBasedConfig jgitConfig = new FileBasedConfig(sitePaths.jgit_config.toFile(), FS.DETECTED);
+    try {
+      jgitConfig.load();
+      if (!jgitConfig
+          .getNames(ConfigConstants.CONFIG_RECEIVE_SECTION)
+          .contains(ConfigConstants.CONFIG_KEY_AUTOGC)) {
+        jgitConfig.setBoolean(
+            ConfigConstants.CONFIG_RECEIVE_SECTION, null, ConfigConstants.CONFIG_KEY_AUTOGC, false);
+        jgitConfig.save();
+        ui.error(
+            "Auto-configured \"receive.autogc = false\" to disable auto-gc after git-receive-pack.");
+      } else if (jgitConfig.getBoolean(
+          ConfigConstants.CONFIG_RECEIVE_SECTION, ConfigConstants.CONFIG_KEY_AUTOGC, true)) {
+        ui.error(
+            "WARNING: JGit option \"receive.autogc = true\". This is not recommended in Gerrit.\n"
+                + "git-receive-pack will run auto gc after receiving data from "
+                + "git-push and updating refs.\n"
+                + "Disable this behavior to avoid the additional load it creates: "
+                + "gc should be configured in gc config section or run as a separate process.");
+      }
+
+      if (!jgitConfig
+          .getNames(ConfigConstants.CONFIG_PROTOCOL_SECTION)
+          .contains(ConfigConstants.CONFIG_KEY_VERSION)) {
+        jgitConfig.setString(
+            ConfigConstants.CONFIG_PROTOCOL_SECTION,
+            null,
+            ConfigConstants.CONFIG_KEY_VERSION,
+            TransferConfig.ProtocolVersion.V2.version());
+        jgitConfig.save();
+        ui.error(
+            String.format(
+                "Auto-configured \"%s.%s = %s\" to activate git wire protocol version 2.",
+                ConfigConstants.CONFIG_PROTOCOL_SECTION,
+                ConfigConstants.CONFIG_KEY_VERSION,
+                TransferConfig.ProtocolVersion.V2.version()));
+      } else {
+        String version =
+            jgitConfig.getString(
+                ConfigConstants.CONFIG_PROTOCOL_SECTION, null, ConfigConstants.CONFIG_KEY_VERSION);
+        if (!TransferConfig.ProtocolVersion.V2.version().equals(version)) {
+          ui.error(
+              String.format(
+                  "HINT: JGit option \"%s.%s = %s\". It's recommended to activate git\n"
+                      + "wire protocol version 2 to improve git fetch performance.",
+                  ConfigConstants.CONFIG_PROTOCOL_SECTION,
+                  ConfigConstants.CONFIG_KEY_VERSION,
+                  version));
+        }
+      }
+    } catch (IOException e) {
+      throw die(String.format("Handling JGit configuration %s failed", sitePaths.jgit_config), e);
+    } catch (ConfigInvalidException e) {
+      throw die(String.format("Invalid JGit configuration %s", sitePaths.jgit_config), e);
+    }
+  }
+}
diff --git a/java/com/google/gerrit/pgm/init/InitModule.java b/java/com/google/gerrit/pgm/init/InitModule.java
index b658675..32c6697 100644
--- a/java/com/google/gerrit/pgm/init/InitModule.java
+++ b/java/com/google/gerrit/pgm/init/InitModule.java
@@ -40,6 +40,7 @@
     // Steps are executed in the order listed here.
     //
     step().to(InitGitManager.class);
+    step().to(InitJGitConfig.class);
     step().to(InitLogging.class);
     step().to(InitIndex.class);
     step().to(InitAuth.class);
diff --git a/java/com/google/gerrit/server/CurrentUser.java b/java/com/google/gerrit/server/CurrentUser.java
index 825b34f..afbc74e 100644
--- a/java/com/google/gerrit/server/CurrentUser.java
+++ b/java/com/google/gerrit/server/CurrentUser.java
@@ -14,6 +14,7 @@
 
 package com.google.gerrit.server;
 
+import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.account.externalids.ExternalId;
@@ -128,6 +129,22 @@
         getClass().getSimpleName() + " is not an IdentifiedUser");
   }
 
+  /**
+   * Returns all email addresses associated with this user. For {@link AnonymousUser} and other
+   * users that don't represent a person user or service account, this set will be empty.
+   */
+  public ImmutableSet<String> getEmailAddresses() {
+    return ImmutableSet.of();
+  }
+
+  /**
+   * Returns all {@link ExternalId.Key}s associated with this user. For {@link AnonymousUser} and
+   * other users that don't represent a person user or service account, this set will be empty.
+   */
+  public ImmutableSet<ExternalId.Key> getExternalIdKeys() {
+    return ImmutableSet.of();
+  }
+
   /** Check if the CurrentUser is an InternalUser. */
   public boolean isInternalUser() {
     return false;
diff --git a/java/com/google/gerrit/server/ExternalUser.java b/java/com/google/gerrit/server/ExternalUser.java
new file mode 100644
index 0000000..9680f3e
--- /dev/null
+++ b/java/com/google/gerrit/server/ExternalUser.java
@@ -0,0 +1,90 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server;
+
+import static com.google.common.flogger.LazyArgs.lazy;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.flogger.FluentLogger;
+import com.google.gerrit.server.account.GroupBackend;
+import com.google.gerrit.server.account.GroupMembership;
+import com.google.gerrit.server.account.externalids.ExternalId;
+import com.google.inject.Inject;
+import com.google.inject.assistedinject.Assisted;
+import java.util.Collection;
+
+/**
+ * Represents a user that does not have a Gerrit account.
+ *
+ * <p>This user is limited in what they can do on Gerrit. For now, we only guarantee that permission
+ * checking - including ref filtering works.
+ *
+ * <p>This class is thread-safe.
+ */
+public class ExternalUser extends CurrentUser {
+  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
+
+  public interface Factory {
+    ExternalUser create(
+        Collection<String> emailAddresses,
+        Collection<ExternalId.Key> externalIdKeys,
+        PropertyMap propertyMap);
+  }
+
+  private final GroupBackend groupBackend;
+  private final ImmutableSet<String> emailAddresses;
+  private final ImmutableSet<ExternalId.Key> externalIdKeys;
+
+  private GroupMembership effectiveGroups;
+
+  @Inject
+  public ExternalUser(
+      GroupBackend groupBackend,
+      @Assisted Collection<String> emailAddresses,
+      @Assisted Collection<ExternalId.Key> externalIdKeys,
+      @Assisted PropertyMap propertyMap) {
+    super(propertyMap);
+    this.groupBackend = groupBackend;
+    this.emailAddresses = ImmutableSet.copyOf(emailAddresses);
+    this.externalIdKeys = ImmutableSet.copyOf(externalIdKeys);
+  }
+
+  @Override
+  public ImmutableSet<String> getEmailAddresses() {
+    return emailAddresses;
+  }
+
+  @Override
+  public ImmutableSet<ExternalId.Key> getExternalIdKeys() {
+    return externalIdKeys;
+  }
+
+  @Override
+  public GroupMembership getEffectiveGroups() {
+    synchronized (this) {
+      if (effectiveGroups == null) {
+        effectiveGroups = groupBackend.membershipsOf(this);
+        logger.atFinest().log(
+            "Known groups of %s: %s", getLoggableName(), lazy(effectiveGroups::getKnownGroups));
+      }
+    }
+    return effectiveGroups;
+  }
+
+  @Override
+  public Object getCacheKey() {
+    return this; // Caching is tied to this exact instance.
+  }
+}
diff --git a/java/com/google/gerrit/server/IdentifiedUser.java b/java/com/google/gerrit/server/IdentifiedUser.java
index 75c7cda..34f0eb5 100644
--- a/java/com/google/gerrit/server/IdentifiedUser.java
+++ b/java/com/google/gerrit/server/IdentifiedUser.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.server;
 
 import static com.google.common.base.MoreObjects.firstNonNull;
+import static com.google.common.collect.ImmutableSet.toImmutableSet;
 import static com.google.common.flogger.LazyArgs.lazy;
 
 import com.google.common.annotations.VisibleForTesting;
@@ -31,6 +32,7 @@
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.account.ListGroupMembership;
 import com.google.gerrit.server.account.Realm;
+import com.google.gerrit.server.account.externalids.ExternalId;
 import com.google.gerrit.server.config.AnonymousCowardName;
 import com.google.gerrit.server.config.AuthConfig;
 import com.google.gerrit.server.config.CanonicalWebUrl;
@@ -380,6 +382,7 @@
     return false;
   }
 
+  @Override
   public ImmutableSet<String> getEmailAddresses() {
     if (!loadedAllEmails) {
       validEmails.addAll(realm.getEmailAddresses(this));
@@ -388,6 +391,11 @@
     return ImmutableSet.copyOf(validEmails);
   }
 
+  @Override
+  public ImmutableSet<ExternalId.Key> getExternalIdKeys() {
+    return state().externalIds().stream().map(ExternalId::key).collect(toImmutableSet());
+  }
+
   public String getName() {
     return getAccount().getName();
   }
diff --git a/java/com/google/gerrit/server/WebLinks.java b/java/com/google/gerrit/server/WebLinks.java
index 47ba325..e66e7f5 100644
--- a/java/com/google/gerrit/server/WebLinks.java
+++ b/java/com/google/gerrit/server/WebLinks.java
@@ -86,29 +86,29 @@
   /**
    * @param project Project name.
    * @param commit SHA1 of commit.
-   * @param subject subject of the commit.
+   * @param commitMessage the commit message of the commit.
    * @param branchName branch of the commit.
    * @return Links for patch sets.
    */
   public ImmutableList<WebLinkInfo> getPatchSetLinks(
-      Project.NameKey project, String commit, String subject, String branchName) {
+      Project.NameKey project, String commit, String commitMessage, String branchName) {
     return filterLinks(
         patchSetLinks,
-        webLink -> webLink.getPatchSetWebLink(project.get(), commit, subject, branchName));
+        webLink -> webLink.getPatchSetWebLink(project.get(), commit, commitMessage, branchName));
   }
 
   /**
    * @param project Project name.
    * @param revision SHA1 of the parent revision.
-   * @param subject subject of the parent revision.
+   * @param commitMessage the commit message of the parent revision.
    * @param branchName branch of the revision (and parent revision).
    * @return Links for patch sets.
    */
   public ImmutableList<WebLinkInfo> getParentLinks(
-      Project.NameKey project, String revision, String subject, String branchName) {
+      Project.NameKey project, String revision, String commitMessage, String branchName) {
     return filterLinks(
         parentLinks,
-        webLink -> webLink.getParentWebLink(project.get(), revision, subject, branchName));
+        webLink -> webLink.getParentWebLink(project.get(), revision, commitMessage, branchName));
   }
 
   /**
diff --git a/java/com/google/gerrit/server/account/GroupBackend.java b/java/com/google/gerrit/server/account/GroupBackend.java
index 545da6e..d6360c5 100644
--- a/java/com/google/gerrit/server/account/GroupBackend.java
+++ b/java/com/google/gerrit/server/account/GroupBackend.java
@@ -19,7 +19,7 @@
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
 import com.google.gerrit.extensions.annotations.ExtensionPoint;
-import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.project.ProjectState;
 import java.util.Collection;
 
@@ -42,7 +42,7 @@
   Collection<GroupReference> suggest(String name, @Nullable ProjectState project);
 
   /** @return the group membership checker for the backend. */
-  GroupMembership membershipsOf(IdentifiedUser user);
+  GroupMembership membershipsOf(CurrentUser user);
 
   /** @return {@code true} if the group with the given UUID is visible to all registered users. */
   boolean isVisibleToAll(AccountGroup.UUID uuid);
diff --git a/java/com/google/gerrit/server/account/IncludingGroupMembership.java b/java/com/google/gerrit/server/account/IncludingGroupMembership.java
index 6dc7976..9cb11a6 100644
--- a/java/com/google/gerrit/server/account/IncludingGroupMembership.java
+++ b/java/com/google/gerrit/server/account/IncludingGroupMembership.java
@@ -14,11 +14,12 @@
 
 package com.google.gerrit.server.account;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 import com.google.gerrit.entities.AccountGroup;
-import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.group.InternalGroup;
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
@@ -40,18 +41,18 @@
  */
 public class IncludingGroupMembership implements GroupMembership {
   public interface Factory {
-    IncludingGroupMembership create(IdentifiedUser user);
+    IncludingGroupMembership create(CurrentUser user);
   }
 
   private final GroupCache groupCache;
   private final GroupIncludeCache includeCache;
-  private final IdentifiedUser user;
+  private final CurrentUser user;
   private final Map<AccountGroup.UUID, Boolean> memberOf;
   private Set<AccountGroup.UUID> knownGroups;
 
   @Inject
   IncludingGroupMembership(
-      GroupCache groupCache, GroupIncludeCache includeCache, @Assisted IdentifiedUser user) {
+      GroupCache groupCache, GroupIncludeCache includeCache, @Assisted CurrentUser user) {
     this.groupCache = groupCache;
     this.includeCache = includeCache;
     this.user = user;
@@ -93,7 +94,7 @@
         if (!group.isPresent()) {
           continue;
         }
-        if (group.get().getMembers().contains(user.getAccountId())) {
+        if (user.isIdentifiedUser() && group.get().getMembers().contains(user.getAccountId())) {
           memberOf.put(id, true);
           return true;
         }
@@ -124,7 +125,10 @@
 
   private ImmutableSet<AccountGroup.UUID> computeKnownGroups() {
     GroupMembership membership = user.getEffectiveGroups();
-    Collection<AccountGroup.UUID> direct = includeCache.getGroupsWithMember(user.getAccountId());
+    Collection<AccountGroup.UUID> direct =
+        user.isIdentifiedUser()
+            ? includeCache.getGroupsWithMember(user.getAccountId())
+            : ImmutableList.of();
     direct.forEach(groupUuid -> memberOf.put(groupUuid, true));
     Set<AccountGroup.UUID> r = Sets.newHashSet(direct);
     r.remove(null);
diff --git a/java/com/google/gerrit/server/account/InternalGroupBackend.java b/java/com/google/gerrit/server/account/InternalGroupBackend.java
index c520c96..8761081 100644
--- a/java/com/google/gerrit/server/account/InternalGroupBackend.java
+++ b/java/com/google/gerrit/server/account/InternalGroupBackend.java
@@ -20,7 +20,7 @@
 import com.google.gerrit.entities.AccountGroup;
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
-import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.group.InternalGroup;
 import com.google.gerrit.server.group.InternalGroupDescription;
 import com.google.gerrit.server.group.db.Groups;
@@ -97,7 +97,7 @@
   }
 
   @Override
-  public GroupMembership membershipsOf(IdentifiedUser user) {
+  public GroupMembership membershipsOf(CurrentUser user) {
     return groupMembershipFactory.create(user);
   }
 
diff --git a/java/com/google/gerrit/server/account/UniversalGroupBackend.java b/java/com/google/gerrit/server/account/UniversalGroupBackend.java
index a35b0ac..5bd9bea 100644
--- a/java/com/google/gerrit/server/account/UniversalGroupBackend.java
+++ b/java/com/google/gerrit/server/account/UniversalGroupBackend.java
@@ -27,7 +27,7 @@
 import com.google.gerrit.entities.AccountGroup;
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
-import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.StartupCheck;
 import com.google.gerrit.server.StartupException;
 import com.google.gerrit.server.config.GerritServerConfig;
@@ -94,14 +94,14 @@
   }
 
   @Override
-  public GroupMembership membershipsOf(IdentifiedUser user) {
+  public GroupMembership membershipsOf(CurrentUser user) {
     return new UniversalGroupMembership(user);
   }
 
   private class UniversalGroupMembership implements GroupMembership {
     private final Map<GroupBackend, GroupMembership> memberships;
 
-    private UniversalGroupMembership(IdentifiedUser user) {
+    private UniversalGroupMembership(CurrentUser user) {
       ImmutableMap.Builder<GroupBackend, GroupMembership> builder = ImmutableMap.builder();
       backends.runEach(g -> builder.put(g, g.membershipsOf(user)));
       this.memberships = builder.build();
diff --git a/java/com/google/gerrit/server/api/projects/BranchApiImpl.java b/java/com/google/gerrit/server/api/projects/BranchApiImpl.java
index c7cca6f..78f5c5f 100644
--- a/java/com/google/gerrit/server/api/projects/BranchApiImpl.java
+++ b/java/com/google/gerrit/server/api/projects/BranchApiImpl.java
@@ -16,6 +16,7 @@
 
 import static com.google.gerrit.server.api.ApiUtil.asRestApiException;
 
+import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.extensions.api.projects.BranchApi;
 import com.google.gerrit.extensions.api.projects.BranchInfo;
 import com.google.gerrit.extensions.api.projects.BranchInput;
@@ -126,6 +127,10 @@
 
   private BranchResource resource()
       throws RestApiException, IOException, PermissionBackendException {
-    return branches.parse(project, IdString.fromDecoded(ref));
+    String refName = ref;
+    if (RefNames.isRefsUsersSelf(ref, project.getProjectState().isAllUsers())) {
+      refName = RefNames.refsUsers(project.getUser().getAccountId());
+    }
+    return branches.parse(project, IdString.fromDecoded(refName));
   }
 }
diff --git a/java/com/google/gerrit/server/auth/ldap/FakeLdapGroupBackend.java b/java/com/google/gerrit/server/auth/ldap/FakeLdapGroupBackend.java
index 63cd426..f806756 100644
--- a/java/com/google/gerrit/server/auth/ldap/FakeLdapGroupBackend.java
+++ b/java/com/google/gerrit/server/auth/ldap/FakeLdapGroupBackend.java
@@ -20,7 +20,7 @@
 import com.google.gerrit.entities.AccountGroup;
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
-import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.account.GroupBackend;
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.account.ListGroupMembership;
@@ -76,7 +76,7 @@
   }
 
   @Override
-  public GroupMembership membershipsOf(IdentifiedUser user) {
+  public GroupMembership membershipsOf(CurrentUser user) {
     return new ListGroupMembership(Collections.emptyList());
   }
 
diff --git a/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java b/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java
index 180612c..d5da406 100644
--- a/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java
+++ b/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java
@@ -29,7 +29,6 @@
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
 import com.google.gerrit.server.CurrentUser;
-import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.account.GroupBackend;
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.account.externalids.ExternalId;
@@ -45,6 +44,7 @@
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ExecutionException;
 import javax.naming.InvalidNameException;
@@ -178,21 +178,13 @@
   }
 
   @Override
-  public GroupMembership membershipsOf(IdentifiedUser user) {
-    String id = findId(user.state().externalIds());
-    if (id == null) {
+  public GroupMembership membershipsOf(CurrentUser user) {
+    Optional<ExternalId.Key> id =
+        user.getExternalIdKeys().stream().filter(e -> e.isScheme(SCHEME_GERRIT)).findAny();
+    if (!id.isPresent()) {
       return GroupMembership.EMPTY;
     }
-    return new LdapGroupMembership(membershipCache, projectCache, id, gerritConfig);
-  }
-
-  private static String findId(Collection<ExternalId> extIds) {
-    for (ExternalId extId : extIds) {
-      if (extId.isScheme(SCHEME_GERRIT)) {
-        return extId.key().id();
-      }
-    }
-    return null;
+    return new LdapGroupMembership(membershipCache, projectCache, id.get().id(), gerritConfig);
   }
 
   private Set<GroupReference> suggestLdap(String name) {
diff --git a/java/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializer.java b/java/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializer.java
index d7bd373..a7a84f7 100644
--- a/java/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializer.java
+++ b/java/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializer.java
@@ -19,6 +19,7 @@
 
 import com.google.gerrit.entities.StoredCommentLinkInfo;
 import com.google.gerrit.server.cache.proto.Cache;
+import java.util.Optional;
 
 /** Helper to (de)serialize values for caches. */
 public class StoredCommentLinkInfoSerializer {
@@ -38,7 +39,7 @@
         .setMatch(nullToEmpty(autoValue.getMatch()))
         .setLink(nullToEmpty(autoValue.getLink()))
         .setHtml(nullToEmpty(autoValue.getHtml()))
-        .setEnabled(autoValue.getEnabled())
+        .setEnabled(Optional.ofNullable(autoValue.getEnabled()).orElse(true))
         .setOverrideOnly(autoValue.getOverrideOnly())
         .build();
   }
diff --git a/java/com/google/gerrit/server/change/ResetCherryPickOp.java b/java/com/google/gerrit/server/change/ResetCherryPickOp.java
new file mode 100644
index 0000000..d1177d4
--- /dev/null
+++ b/java/com/google/gerrit/server/change/ResetCherryPickOp.java
@@ -0,0 +1,37 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.change;
+
+import com.google.gerrit.entities.Change;
+import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.server.notedb.ChangeUpdate;
+import com.google.gerrit.server.update.BatchUpdateOp;
+import com.google.gerrit.server.update.ChangeContext;
+
+/** Reset cherryPickOf to an empty value. */
+public class ResetCherryPickOp implements BatchUpdateOp {
+
+  @Override
+  public boolean updateChange(ChangeContext ctx) throws RestApiException {
+    Change change = ctx.getChange();
+    if (change.getCherryPickOf() == null) {
+      return false;
+    }
+
+    ChangeUpdate update = ctx.getUpdate(change.currentPatchSetId());
+    update.resetCherryPickOf();
+    return true;
+  }
+}
diff --git a/java/com/google/gerrit/server/change/RevisionJson.java b/java/com/google/gerrit/server/change/RevisionJson.java
index 90caea0..c1c0cfc 100644
--- a/java/com/google/gerrit/server/change/RevisionJson.java
+++ b/java/com/google/gerrit/server/change/RevisionJson.java
@@ -183,7 +183,7 @@
 
     if (addLinks) {
       ImmutableList<WebLinkInfo> links =
-          webLinks.getPatchSetLinks(project, commit.name(), commit.getShortMessage(), branchName);
+          webLinks.getPatchSetLinks(project, commit.name(), commit.getFullMessage(), branchName);
       info.webLinks = links.isEmpty() ? null : links;
     }
 
@@ -194,7 +194,7 @@
       i.subject = parent.getShortMessage();
       if (addLinks) {
         ImmutableList<WebLinkInfo> parentLinks =
-            webLinks.getParentLinks(project, parent.name(), parent.getShortMessage(), branchName);
+            webLinks.getParentLinks(project, parent.name(), parent.getFullMessage(), branchName);
         i.webLinks = parentLinks.isEmpty() ? null : parentLinks;
       }
       info.parents.add(i);
diff --git a/java/com/google/gerrit/server/comment/CommentContextKey.java b/java/com/google/gerrit/server/comment/CommentContextKey.java
index e4a927a..ccd50b7 100644
--- a/java/com/google/gerrit/server/comment/CommentContextKey.java
+++ b/java/com/google/gerrit/server/comment/CommentContextKey.java
@@ -6,11 +6,10 @@
 import com.google.gerrit.proto.Protos;
 import com.google.gerrit.server.cache.proto.Cache;
 import com.google.gerrit.server.cache.serialize.CacheSerializer;
-import java.util.Collection;
 
 /**
  * An identifier of a comment that should be used to load the comment context using {@link
- * CommentContextCache#get(CommentContextKey)}, or {@link CommentContextCache#getAll(Collection)}.
+ * CommentContextCache#get(CommentContextKey)}, or {@link CommentContextCache#getAll(Iterable)}.
  *
  * <p>The {@link CommentContextCacheImpl} implementation uses this class as the cache key, while
  * replacing the {@link #path()} field with the hashed path.
diff --git a/java/com/google/gerrit/server/config/GerritGlobalModule.java b/java/com/google/gerrit/server/config/GerritGlobalModule.java
index 6a25afd..ee37d17 100644
--- a/java/com/google/gerrit/server/config/GerritGlobalModule.java
+++ b/java/com/google/gerrit/server/config/GerritGlobalModule.java
@@ -81,6 +81,7 @@
 import com.google.gerrit.server.DynamicOptions;
 import com.google.gerrit.server.ExceptionHook;
 import com.google.gerrit.server.ExceptionHookImpl;
+import com.google.gerrit.server.ExternalUser;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.RequestListener;
 import com.google.gerrit.server.TraceRequestListener;
@@ -180,6 +181,7 @@
 import com.google.gerrit.server.query.change.ChangeQueryBuilder;
 import com.google.gerrit.server.query.change.ConflictsCacheImpl;
 import com.google.gerrit.server.quota.QuotaEnforcer;
+import com.google.gerrit.server.restapi.change.OnPostReview;
 import com.google.gerrit.server.restapi.change.SuggestReviewers;
 import com.google.gerrit.server.restapi.group.GroupModule;
 import com.google.gerrit.server.rules.DefaultSubmitRule;
@@ -278,6 +280,7 @@
     factory(ProjectState.Factory.class);
     factory(RevisionJson.Factory.class);
     factory(InboundEmailRejectionSender.Factory.class);
+    factory(ExternalUser.Factory.class);
     bind(PermissionCollection.Factory.class);
     bind(AccountVisibility.class).toProvider(AccountVisibilityProvider.class).in(SINGLETON);
     AccountDefaultDisplayName accountDefaultDisplayName =
@@ -413,6 +416,7 @@
     DynamicSet.setOf(binder(), ExceptionHook.class);
     DynamicSet.bind(binder(), ExceptionHook.class).to(ExceptionHookImpl.class);
     DynamicSet.setOf(binder(), MailSoyTemplateProvider.class);
+    DynamicSet.setOf(binder(), OnPostReview.class);
 
     DynamicMap.mapOf(binder(), MailFilter.class);
     bind(MailFilter.class).annotatedWith(Exports.named("ListMailFilter")).to(ListMailFilter.class);
diff --git a/java/com/google/gerrit/server/config/GitwebConfig.java b/java/com/google/gerrit/server/config/GitwebConfig.java
index 3340a52..8214f03 100644
--- a/java/com/google/gerrit/server/config/GitwebConfig.java
+++ b/java/com/google/gerrit/server/config/GitwebConfig.java
@@ -328,9 +328,9 @@
 
     @Override
     public WebLinkInfo getPatchSetWebLink(
-        String projectName, String commit, String subject, String branchName) {
+        String projectName, String commit, String commitMessage, String branchName) {
       if (revision != null) {
-        // subject and branchName are not needed, hence not used.
+        // commitMessage and branchName are not needed, hence not used.
         return link(
             revision
                 .replace("project", encode(projectName))
@@ -342,9 +342,9 @@
 
     @Override
     public WebLinkInfo getParentWebLink(
-        String projectName, String commit, String subject, String branchName) {
+        String projectName, String commit, String commitMessage, String branchName) {
       // For Gitweb treat parent revision links the same as patch set links
-      return getPatchSetWebLink(projectName, commit, subject, branchName);
+      return getPatchSetWebLink(projectName, commit, commitMessage, branchName);
     }
 
     @Override
diff --git a/java/com/google/gerrit/server/git/receive/ReceiveCommits.java b/java/com/google/gerrit/server/git/receive/ReceiveCommits.java
index fb8a9d3..4c90ef9 100644
--- a/java/com/google/gerrit/server/git/receive/ReceiveCommits.java
+++ b/java/com/google/gerrit/server/git/receive/ReceiveCommits.java
@@ -21,11 +21,12 @@
 import static com.google.common.flogger.LazyArgs.lazy;
 import static com.google.gerrit.entities.RefNames.REFS_CHANGES;
 import static com.google.gerrit.entities.RefNames.isConfigRef;
+import static com.google.gerrit.entities.RefNames.isRefsUsersSelf;
 import static com.google.gerrit.git.ObjectIds.abbreviateName;
 import static com.google.gerrit.server.change.HashtagsUtil.cleanupHashtag;
 import static com.google.gerrit.server.git.MultiProgressMonitor.UNKNOWN;
 import static com.google.gerrit.server.git.receive.ReceiveConstants.COMMAND_REJECTION_MESSAGE_FOOTER;
-import static com.google.gerrit.server.git.receive.ReceiveConstants.ONLY_CHANGE_OWNER_OR_PROJECT_OWNER_CAN_MODIFY_WIP;
+import static com.google.gerrit.server.git.receive.ReceiveConstants.ONLY_USERS_WITH_TOGGLE_WIP_STATE_PERM_CAN_MODIFY_WIP;
 import static com.google.gerrit.server.git.receive.ReceiveConstants.PUSH_OPTION_SKIP_VALIDATION;
 import static com.google.gerrit.server.git.receive.ReceiveConstants.SAME_CHANGE_ID_IN_MULTIPLE_CHANGES;
 import static com.google.gerrit.server.git.validators.CommitValidators.NEW_PATCHSET_PATTERN;
@@ -1080,7 +1081,7 @@
   private ReceiveCommand wrapReceiveCommand(ReceiveCommand cmd, Task progress) {
     String refname = cmd.getRefName();
 
-    if (projectState.isAllUsers() && RefNames.REFS_USERS_SELF.equals(cmd.getRefName())) {
+    if (isRefsUsersSelf(cmd.getRefName(), projectState.isAllUsers())) {
       refname = RefNames.refsUsers(user.getAccountId());
       logger.atFine().log("Swapping out command for %s to %s", RefNames.REFS_USERS_SELF, refname);
     }
@@ -2691,12 +2692,10 @@
 
   private void readChangesForReplace() {
     try (TraceTimer traceTimer = newTimer("readChangesForReplace")) {
-      Collection<ChangeNotes> allNotes =
-          notesFactory.createUsingIndexLookup(
-              replaceByChange.values().stream().map(r -> r.ontoChange).collect(toList()));
-      for (ChangeNotes notes : allNotes) {
-        replaceByChange.get(notes.getChangeId()).notes = notes;
-      }
+      replaceByChange.values().stream()
+          .map(r -> r.ontoChange)
+          .map(id -> notesFactory.create(project.getNameKey(), id))
+          .forEach(notes -> replaceByChange.get(notes.getChangeId()).notes = notes);
     }
   }
 
@@ -2883,9 +2882,9 @@
 
         if (!hasWriteConfigPermission) {
           try {
-            permissionBackend.user(user).check(GlobalPermission.ADMINISTRATE_SERVER);
+            permissions.change(notes).check(ChangePermission.TOGGLE_WORK_IN_PROGRESS_STATE);
           } catch (AuthException e1) {
-            reject(inputCommand, ONLY_CHANGE_OWNER_OR_PROJECT_OWNER_CAN_MODIFY_WIP);
+            reject(inputCommand, ONLY_USERS_WITH_TOGGLE_WIP_STATE_PERM_CAN_MODIFY_WIP);
           }
         }
       }
diff --git a/java/com/google/gerrit/server/git/receive/ReceiveConstants.java b/java/com/google/gerrit/server/git/receive/ReceiveConstants.java
index 03a1b33..df1888b 100644
--- a/java/com/google/gerrit/server/git/receive/ReceiveConstants.java
+++ b/java/com/google/gerrit/server/git/receive/ReceiveConstants.java
@@ -20,8 +20,8 @@
   public static final String PUSH_OPTION_SKIP_VALIDATION = "skip-validation";
 
   @VisibleForTesting
-  public static final String ONLY_CHANGE_OWNER_OR_PROJECT_OWNER_CAN_MODIFY_WIP =
-      "only change owner or project owner can modify Work-in-Progress";
+  public static final String ONLY_USERS_WITH_TOGGLE_WIP_STATE_PERM_CAN_MODIFY_WIP =
+      "only users with Toogle-Wip-State permission can modify Work-in-Progress";
 
   static final String COMMAND_REJECTION_MESSAGE_FOOTER =
       "Contact an administrator to fix the permissions";
diff --git a/java/com/google/gerrit/server/group/SystemGroupBackend.java b/java/com/google/gerrit/server/group/SystemGroupBackend.java
index b5ccb18..5d50d22 100644
--- a/java/com/google/gerrit/server/group/SystemGroupBackend.java
+++ b/java/com/google/gerrit/server/group/SystemGroupBackend.java
@@ -24,6 +24,8 @@
 import com.google.gerrit.entities.AccountGroup;
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.ExternalUser;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.StartupCheck;
 import com.google.gerrit.server.StartupException;
@@ -90,6 +92,7 @@
   private final SortedMap<String, GroupReference> namesToGroups;
   private final ImmutableSet<String> names;
   private final ImmutableMap<AccountGroup.UUID, GroupReference> uuids;
+  private final ImmutableSet<AccountGroup.UUID> externalUserMemberships;
 
   @Inject
   @VisibleForTesting
@@ -114,6 +117,10 @@
         ImmutableSet.copyOf(
             namesToGroups.values().stream().map(GroupReference::getName).collect(toSet()));
     uuids = u.build();
+    externalUserMemberships =
+        cfg.getBoolean("groups", null, "includeExternalUsersInRegisteredUsersGroup", true)
+            ? ImmutableSet.of(ANONYMOUS_USERS, REGISTERED_USERS)
+            : ImmutableSet.of(ANONYMOUS_USERS);
   }
 
   public GroupReference getGroup(AccountGroup.UUID uuid) {
@@ -182,8 +189,14 @@
   }
 
   @Override
-  public GroupMembership membershipsOf(IdentifiedUser user) {
-    return new ListGroupMembership(ImmutableSet.of(ANONYMOUS_USERS, REGISTERED_USERS));
+  public GroupMembership membershipsOf(CurrentUser user) {
+    if (user instanceof ExternalUser) {
+      return new ListGroupMembership(externalUserMemberships);
+    }
+    if (user instanceof IdentifiedUser) {
+      return new ListGroupMembership(ImmutableSet.of(ANONYMOUS_USERS, REGISTERED_USERS));
+    }
+    return new ListGroupMembership(ImmutableSet.of(ANONYMOUS_USERS));
   }
 
   public static class NameCheck implements StartupCheck {
diff --git a/java/com/google/gerrit/server/group/testing/TestGroupBackend.java b/java/com/google/gerrit/server/group/testing/TestGroupBackend.java
index 35f18a2..601ac59 100644
--- a/java/com/google/gerrit/server/group/testing/TestGroupBackend.java
+++ b/java/com/google/gerrit/server/group/testing/TestGroupBackend.java
@@ -22,7 +22,7 @@
 import com.google.gerrit.entities.AccountGroup;
 import com.google.gerrit.entities.GroupDescription;
 import com.google.gerrit.entities.GroupReference;
-import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.account.GroupBackend;
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.project.ProjectState;
@@ -122,7 +122,10 @@
   }
 
   @Override
-  public GroupMembership membershipsOf(IdentifiedUser user) {
+  public GroupMembership membershipsOf(CurrentUser user) {
+    if (!user.isIdentifiedUser()) {
+      return GroupMembership.EMPTY;
+    }
     return memberships.getOrDefault(user.getAccountId(), GroupMembership.EMPTY);
   }
 
diff --git a/java/com/google/gerrit/server/index/change/ChangeField.java b/java/com/google/gerrit/server/index/change/ChangeField.java
index ef538cb..5f2525e 100644
--- a/java/com/google/gerrit/server/index/change/ChangeField.java
+++ b/java/com/google/gerrit/server/index/change/ChangeField.java
@@ -152,6 +152,12 @@
   public static final FieldDef<ChangeData, Timestamp> UPDATED =
       timestamp("updated2").stored().build(changeGetter(Change::getLastUpdatedOn));
 
+  /** When this change was merged, time since January 1, 1970. */
+  public static final FieldDef<ChangeData, Timestamp> MERGED_ON =
+      timestamp(ChangeQueryBuilder.FIELD_MERGED_ON)
+          .stored()
+          .build(cd -> cd.getMergedOn().orElse(null));
+
   /** List of full file paths modified in the current patch set. */
   public static final FieldDef<ChangeData, Iterable<String>> PATH =
       // Named for backwards compatibility.
diff --git a/java/com/google/gerrit/server/index/change/ChangeSchemaDefinitions.java b/java/com/google/gerrit/server/index/change/ChangeSchemaDefinitions.java
index 928f21c..969b071 100644
--- a/java/com/google/gerrit/server/index/change/ChangeSchemaDefinitions.java
+++ b/java/com/google/gerrit/server/index/change/ChangeSchemaDefinitions.java
@@ -130,9 +130,14 @@
           .build();
 
   /** Added new fields {@link ChangeField#MERGE} */
+  @Deprecated
   static final Schema<ChangeData> V60 =
       new Schema.Builder<ChangeData>().add(V59).add(ChangeField.MERGE).build();
 
+  /** Added new field {@link ChangeField#MERGED_ON} */
+  static final Schema<ChangeData> V61 =
+      new Schema.Builder<ChangeData>().add(V60).add(ChangeField.MERGED_ON).build();
+
   /**
    * Name of the change index to be used when contacting index backends or loading configurations.
    */
diff --git a/java/com/google/gerrit/server/notedb/ChangeNotesParser.java b/java/com/google/gerrit/server/notedb/ChangeNotesParser.java
index 6403b95..846d4b8 100644
--- a/java/com/google/gerrit/server/notedb/ChangeNotesParser.java
+++ b/java/com/google/gerrit/server/notedb/ChangeNotesParser.java
@@ -55,6 +55,7 @@
 import com.google.common.collect.Tables;
 import com.google.common.flogger.FluentLogger;
 import com.google.common.primitives.Ints;
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.Address;
 import com.google.gerrit.entities.AttentionSetUpdate;
@@ -155,7 +156,10 @@
   private ReviewerByEmailSet pendingReviewersByEmail;
   private Change.Id revertOf;
   private int updateCount;
-  private PatchSet.Id cherryPickOf;
+  // Null indicates that the field was not parsed (yet).
+  // We only set the value once, based on the latest update (the actual value or Optional.empty() if
+  // the latest record unsets the field).
+  private Optional<PatchSet.Id> cherryPickOf;
   private Timestamp mergedOn;
 
   ChangeNotesParser(
@@ -259,7 +263,7 @@
         firstNonNull(workInProgress, false),
         firstNonNull(hasReviewStarted, true),
         revertOf,
-        cherryPickOf,
+        cherryPickOf != null ? cherryPickOf.orElse(null) : null,
         updateCount,
         mergedOn);
   }
@@ -1016,15 +1020,31 @@
     return Change.id(revertOf);
   }
 
-  private PatchSet.Id parseCherryPickOf(ChangeNotesCommit commit) throws ConfigInvalidException {
-    String cherryPickOf = parseOneFooter(commit, FOOTER_CHERRY_PICK_OF);
-    if (cherryPickOf == null) {
+  /**
+   * Parses {@link ChangeNoteUtil#FOOTER_CHERRY_PICK_OF} of the commit.
+   *
+   * @param commit the commit to parse.
+   * @return {@link Optional} value of the parsed footer or {@code null} if the footer is missing in
+   *     this commit.
+   * @throws ConfigInvalidException if the footer value could not be parsed as a valid {@link
+   *     PatchSet.Id}.
+   */
+  @Nullable
+  private Optional<PatchSet.Id> parseCherryPickOf(ChangeNotesCommit commit)
+      throws ConfigInvalidException {
+    String footer = parseOneFooter(commit, FOOTER_CHERRY_PICK_OF);
+    if (footer == null) {
+      // The footer is missing, nothing to parse.
       return null;
-    }
-    try {
-      return PatchSet.Id.parse(cherryPickOf);
-    } catch (IllegalArgumentException e) {
-      throw new ConfigInvalidException("\"" + cherryPickOf + "\" is not a valid patchset", e);
+    } else if (footer.equals("")) {
+      // Empty footer value, cherryPickOf was unset at this commit.
+      return Optional.empty();
+    } else {
+      try {
+        return Optional.of(PatchSet.Id.parse(footer));
+      } catch (IllegalArgumentException e) {
+        throw new ConfigInvalidException("\"" + footer + "\" is not a valid patchset", e);
+      }
     }
   }
 
diff --git a/java/com/google/gerrit/server/notedb/ChangeUpdate.java b/java/com/google/gerrit/server/notedb/ChangeUpdate.java
index 6d75bd2..9d23137 100644
--- a/java/com/google/gerrit/server/notedb/ChangeUpdate.java
+++ b/java/com/google/gerrit/server/notedb/ChangeUpdate.java
@@ -154,7 +154,9 @@
   private Boolean isPrivate;
   private Boolean workInProgress;
   private Integer revertOf;
-  private String cherryPickOf;
+  // If null, the update does not modify the field. Otherwise, it updates the field with the
+  // new value or resets if cherryPickOf == Optional.empty().
+  private Optional<String> cherryPickOf;
 
   private ChangeDraftUpdate draftUpdate;
   private RobotCommentUpdate robotCommentUpdate;
@@ -475,7 +477,12 @@
   }
 
   public void setCherryPickOf(String cherryPickOf) {
-    this.cherryPickOf = cherryPickOf;
+    checkArgument(cherryPickOf != null, "use resetCherryPickOf");
+    this.cherryPickOf = Optional.of(cherryPickOf);
+  }
+
+  public void resetCherryPickOf() {
+    this.cherryPickOf = Optional.empty();
   }
 
   /** @return the tree id for the updated tree */
@@ -738,7 +745,12 @@
     }
 
     if (cherryPickOf != null) {
-      addFooter(msg, FOOTER_CHERRY_PICK_OF, cherryPickOf);
+      if (cherryPickOf.isPresent()) {
+        addFooter(msg, FOOTER_CHERRY_PICK_OF, cherryPickOf.get());
+      } else {
+        // Update cherryPickOf with an empty value.
+        addFooter(msg, FOOTER_CHERRY_PICK_OF).append('\n');
+      }
     }
 
     if (plannedAttentionSetUpdates != null) {
@@ -782,21 +794,25 @@
         getNotes().getReviewers().byState(ReviewerStateInternal.REVIEWER);
     Set<AttentionSetUpdate> updates = new HashSet<>();
     for (Map.Entry<Account.Id, ReviewerStateInternal> reviewer : reviewers.entrySet()) {
-      // Only add new reviewers to the attention set.
-      if (reviewer.getValue().equals(ReviewerStateInternal.REVIEWER)
-          && !currentReviewers.contains(reviewer.getKey())) {
+      Account.Id reviewerId = reviewer.getKey();
+      ReviewerStateInternal reviewerState = reviewer.getValue();
+      // Only add new reviewers to the attention set. Also, don't add the owner because the owner
+      // can only be a "dummy" reviewer for legacy reasons.
+      if (reviewerState.equals(ReviewerStateInternal.REVIEWER)
+          && !currentReviewers.contains(reviewerId)
+          && !reviewerId.equals(getChange().getOwner())) {
         updates.add(
             AttentionSetUpdate.createForWrite(
-                reviewer.getKey(), AttentionSetUpdate.Operation.ADD, "Reviewer was added"));
+                reviewerId, AttentionSetUpdate.Operation.ADD, "Reviewer was added"));
       }
       boolean reviewerRemoved =
-          !reviewer.getValue().equals(ReviewerStateInternal.REVIEWER)
-              && currentReviewers.contains(reviewer.getKey());
-      boolean ccRemoved = reviewer.getValue().equals(ReviewerStateInternal.REMOVED);
+          !reviewerState.equals(ReviewerStateInternal.REVIEWER)
+              && currentReviewers.contains(reviewerId);
+      boolean ccRemoved = reviewerState.equals(ReviewerStateInternal.REMOVED);
       if (reviewerRemoved || ccRemoved) {
         updates.add(
             AttentionSetUpdate.createForWrite(
-                reviewer.getKey(), AttentionSetUpdate.Operation.REMOVE, "Reviewer/Cc was removed"));
+                reviewerId, AttentionSetUpdate.Operation.REMOVE, "Reviewer/Cc was removed"));
       }
     }
     addToPlannedAttentionSetUpdates(updates);
diff --git a/java/com/google/gerrit/server/patch/gitfilediff/FileHeaderUtil.java b/java/com/google/gerrit/server/patch/gitfilediff/FileHeaderUtil.java
index 77918337..7454f81 100644
--- a/java/com/google/gerrit/server/patch/gitfilediff/FileHeaderUtil.java
+++ b/java/com/google/gerrit/server/patch/gitfilediff/FileHeaderUtil.java
@@ -84,7 +84,8 @@
 
   /**
    * Returns the old file path associated with the {@link FileHeader}, or empty if the file is
-   * {@link Patch.ChangeType#ADDED} or {@link Patch.ChangeType#REWRITE}.
+   * {@link com.google.gerrit.entities.Patch.ChangeType#ADDED} or {@link
+   * com.google.gerrit.entities.Patch.ChangeType#REWRITE}.
    */
   public static Optional<String> getOldPath(FileHeader header) {
     Patch.ChangeType changeType = getChangeType(header);
@@ -104,7 +105,7 @@
 
   /**
    * Returns the new file path associated with the {@link FileHeader}, or empty if the file is
-   * {@link Patch.ChangeType#DELETED}.
+   * {@link com.google.gerrit.entities.Patch.ChangeType#DELETED}.
    */
   public static Optional<String> getNewPath(FileHeader header) {
     Patch.ChangeType changeType = getChangeType(header);
diff --git a/java/com/google/gerrit/server/permissions/DefaultPermissionBackend.java b/java/com/google/gerrit/server/permissions/DefaultPermissionBackend.java
index 41db9ee..66299a8 100644
--- a/java/com/google/gerrit/server/permissions/DefaultPermissionBackend.java
+++ b/java/com/google/gerrit/server/permissions/DefaultPermissionBackend.java
@@ -99,8 +99,8 @@
   }
 
   /**
-   * Returns the {@link Account.Id} of the current user if a user is signed in. Catches exceptions
-   * so that background jobs don't get impacted.
+   * Returns the {@link com.google.gerrit.entities.Account.Id} of the current user if a user is
+   * signed in. Catches exceptions so that background jobs don't get impacted.
    */
   private Optional<Account.Id> getAccountIdOfIdentifiedUser() {
     try {
diff --git a/java/com/google/gerrit/server/permissions/RefControl.java b/java/com/google/gerrit/server/permissions/RefControl.java
index ad4188f..dd00dca 100644
--- a/java/com/google/gerrit/server/permissions/RefControl.java
+++ b/java/com/google/gerrit/server/permissions/RefControl.java
@@ -619,6 +619,10 @@
     private boolean can(RefPermission perm) throws PermissionBackendException {
       switch (perm) {
         case READ:
+          /* Internal users such as plugin users should be able to read all refs. */
+          if (getUser().isInternalUser()) {
+            return true;
+          }
           if (refName.startsWith(Constants.R_TAGS)) {
             return isTagVisible();
           }
diff --git a/java/com/google/gerrit/server/permissions/RefVisibilityControl.java b/java/com/google/gerrit/server/permissions/RefVisibilityControl.java
index 4744037..cc6387b 100644
--- a/java/com/google/gerrit/server/permissions/RefVisibilityControl.java
+++ b/java/com/google/gerrit/server/permissions/RefVisibilityControl.java
@@ -118,9 +118,14 @@
     Account.Id accountId;
     if ((accountId = Account.Id.fromRef(refName)) != null) {
       // Account ref is visible only to the corresponding account.
-      if (accountId.equals(currentUserAccountId)
-          && projectControl.controlForRef(refName).hasReadPermissionOnRef(true)) {
-        return true;
+      if (accountId.equals(currentUserAccountId)) {
+        // Always allow visibility to refs/draft-comments and refs/starred-changes. For all other
+        // refs, check if the user has read permissions.
+        if (RefNames.isRefsDraftsComments(refName)
+            || RefNames.isRefsStarredChanges(refName)
+            || projectControl.controlForRef(refName).hasReadPermissionOnRef(true)) {
+          return true;
+        }
       }
       return false;
     }
diff --git a/java/com/google/gerrit/server/project/ProjectState.java b/java/com/google/gerrit/server/project/ProjectState.java
index eecf1fe..8c024ef 100644
--- a/java/com/google/gerrit/server/project/ProjectState.java
+++ b/java/com/google/gerrit/server/project/ProjectState.java
@@ -14,7 +14,9 @@
 
 package com.google.gerrit.server.project;
 
+import static com.google.common.collect.ImmutableList.toImmutableList;
 import static com.google.gerrit.entities.PermissionRule.Action.ALLOW;
+import static java.util.Comparator.comparing;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.FluentIterable;
@@ -264,7 +266,10 @@
   List<SectionMatcher> getLocalAccessSections() {
     List<SectionMatcher> sm = localAccessSections;
     if (sm == null) {
-      Collection<AccessSection> fromConfig = cachedConfig.getAccessSections().values();
+      ImmutableList<AccessSection> fromConfig =
+          cachedConfig.getAccessSections().values().stream()
+              .sorted(comparing(AccessSection::getName))
+              .collect(toImmutableList());
       sm = new ArrayList<>(fromConfig.size());
       for (AccessSection section : fromConfig) {
         if (isAllProjects) {
diff --git a/java/com/google/gerrit/server/query/change/AfterPredicate.java b/java/com/google/gerrit/server/query/change/AfterPredicate.java
index df5a71d..8f92d9a 100644
--- a/java/com/google/gerrit/server/query/change/AfterPredicate.java
+++ b/java/com/google/gerrit/server/query/change/AfterPredicate.java
@@ -14,15 +14,21 @@
 
 package com.google.gerrit.server.query.change;
 
+import com.google.gerrit.index.FieldDef;
 import com.google.gerrit.index.query.QueryParseException;
-import com.google.gerrit.server.index.change.ChangeField;
+import java.sql.Timestamp;
 import java.util.Date;
 
+/**
+ * Predicate that matches a {@link Timestamp} field from the index in a range from the passed {@code
+ * String} representation of the Timestamp value to the maximum supported time.
+ */
 public class AfterPredicate extends TimestampRangeChangePredicate {
   protected final Date cut;
 
-  public AfterPredicate(String value) throws QueryParseException {
-    super(ChangeField.UPDATED, ChangeQueryBuilder.FIELD_BEFORE, value);
+  public AfterPredicate(FieldDef<ChangeData, Timestamp> def, String name, String value)
+      throws QueryParseException {
+    super(def, name, value);
     cut = parse(value);
   }
 
@@ -38,6 +44,10 @@
 
   @Override
   public boolean match(ChangeData cd) {
-    return cd.change().getLastUpdatedOn().getTime() >= cut.getTime();
+    Timestamp valueTimestamp = this.getValueTimestamp(cd);
+    if (valueTimestamp == null) {
+      return false;
+    }
+    return valueTimestamp.getTime() >= cut.getTime();
   }
 }
diff --git a/java/com/google/gerrit/server/query/change/AgePredicate.java b/java/com/google/gerrit/server/query/change/AgePredicate.java
index 36eb5b7..d38789f 100644
--- a/java/com/google/gerrit/server/query/change/AgePredicate.java
+++ b/java/com/google/gerrit/server/query/change/AgePredicate.java
@@ -17,7 +17,6 @@
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
-import com.google.gerrit.entities.Change;
 import com.google.gerrit.server.config.ConfigUtil;
 import com.google.gerrit.server.index.change.ChangeField;
 import com.google.gerrit.server.util.time.TimeUtil;
@@ -46,7 +45,10 @@
 
   @Override
   public boolean match(ChangeData object) {
-    Change change = object.change();
-    return change != null && change.getLastUpdatedOn().getTime() <= cut;
+    Timestamp valueTimestamp = this.getValueTimestamp(object);
+    if (valueTimestamp == null) {
+      return false;
+    }
+    return valueTimestamp.getTime() <= cut;
   }
 }
diff --git a/java/com/google/gerrit/server/query/change/BeforePredicate.java b/java/com/google/gerrit/server/query/change/BeforePredicate.java
index dacabc0..6e28ce6 100644
--- a/java/com/google/gerrit/server/query/change/BeforePredicate.java
+++ b/java/com/google/gerrit/server/query/change/BeforePredicate.java
@@ -14,15 +14,21 @@
 
 package com.google.gerrit.server.query.change;
 
+import com.google.gerrit.index.FieldDef;
 import com.google.gerrit.index.query.QueryParseException;
-import com.google.gerrit.server.index.change.ChangeField;
+import java.sql.Timestamp;
 import java.util.Date;
 
+/**
+ * Predicate that matches a {@link Timestamp} field from the index in a range from the the epoch to
+ * the passed {@code String} representation of the Timestamp value.
+ */
 public class BeforePredicate extends TimestampRangeChangePredicate {
   protected final Date cut;
 
-  public BeforePredicate(String value) throws QueryParseException {
-    super(ChangeField.UPDATED, ChangeQueryBuilder.FIELD_BEFORE, value);
+  public BeforePredicate(FieldDef<ChangeData, Timestamp> def, String name, String value)
+      throws QueryParseException {
+    super(def, name, value);
     cut = parse(value);
   }
 
@@ -38,6 +44,10 @@
 
   @Override
   public boolean match(ChangeData cd) {
-    return cd.change().getLastUpdatedOn().getTime() <= cut.getTime();
+    Timestamp valueTimestamp = this.getValueTimestamp(cd);
+    if (valueTimestamp == null) {
+      return false;
+    }
+    return valueTimestamp.getTime() <= cut.getTime();
   }
 }
diff --git a/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java b/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java
index ff90c3f..68a90d2 100644
--- a/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java
+++ b/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java
@@ -142,7 +142,7 @@
   public static final String FIELD_ASSIGNEE = "assignee";
   public static final String FIELD_AUTHOR = "author";
   public static final String FIELD_EXACTAUTHOR = "exactauthor";
-  public static final String FIELD_BEFORE = "before";
+
   public static final String FIELD_CHANGE = "change";
   public static final String FIELD_CHANGE_ID = "change_id";
   public static final String FIELD_COMMENT = "comment";
@@ -169,6 +169,7 @@
   public static final String FIELD_LIMIT = "limit";
   public static final String FIELD_MERGE = "merge";
   public static final String FIELD_MERGEABLE = "mergeable2";
+  public static final String FIELD_MERGED_ON = "mergedon";
   public static final String FIELD_MESSAGE = "message";
   public static final String FIELD_OWNER = "owner";
   public static final String FIELD_OWNERIN = "ownerin";
@@ -205,6 +206,13 @@
   public static final String ARG_ID_OWNER = "owner";
   public static final Account.Id OWNER_ACCOUNT_ID = Account.id(0);
 
+  public static final String OPERATOR_MERGED_BEFORE = "mergedbefore";
+  public static final String OPERATOR_MERGED_AFTER = "mergedafter";
+
+  // Operators to match on the last time the change was updated. Naming for legacy reasons.
+  public static final String OPERATOR_BEFORE = "before";
+  public static final String OPERATOR_AFTER = "after";
+
   private static final QueryBuilder.Definition<ChangeData, ChangeQueryBuilder> mydef =
       new QueryBuilder.Definition<>(ChangeQueryBuilder.class);
 
@@ -471,7 +479,7 @@
 
   @Operator
   public Predicate<ChangeData> before(String value) throws QueryParseException {
-    return new BeforePredicate(value);
+    return new BeforePredicate(ChangeField.UPDATED, ChangeQueryBuilder.OPERATOR_BEFORE, value);
   }
 
   @Operator
@@ -481,7 +489,7 @@
 
   @Operator
   public Predicate<ChangeData> after(String value) throws QueryParseException {
-    return new AfterPredicate(value);
+    return new AfterPredicate(ChangeField.UPDATED, ChangeQueryBuilder.OPERATOR_AFTER, value);
   }
 
   @Operator
@@ -490,6 +498,28 @@
   }
 
   @Operator
+  public Predicate<ChangeData> mergedBefore(String value) throws QueryParseException {
+    if (!args.index.getSchema().hasField(ChangeField.MERGED_ON)) {
+      throw new QueryParseException(
+          String.format(
+              "'%s' operator is not supported by change index version", OPERATOR_MERGED_BEFORE));
+    }
+    return new BeforePredicate(
+        ChangeField.MERGED_ON, ChangeQueryBuilder.OPERATOR_MERGED_BEFORE, value);
+  }
+
+  @Operator
+  public Predicate<ChangeData> mergedAfter(String value) throws QueryParseException {
+    if (!args.index.getSchema().hasField(ChangeField.MERGED_ON)) {
+      throw new QueryParseException(
+          String.format(
+              "'%s' operator is not supported by change index version", OPERATOR_MERGED_AFTER));
+    }
+    return new AfterPredicate(
+        ChangeField.MERGED_ON, ChangeQueryBuilder.OPERATOR_MERGED_AFTER, value);
+  }
+
+  @Operator
   public Predicate<ChangeData> change(String query) throws QueryParseException {
     Optional<ChangeTriplet> triplet = ChangeTriplet.parse(query);
     if (triplet.isPresent()) {
@@ -630,7 +660,15 @@
     }
 
     if ("submittable".equalsIgnoreCase(value)) {
-      return new SubmittablePredicate(SubmitRecord.Status.OK);
+      // SubmittablePredicate will match if *any* of the submit records are OK,
+      // but we need to check that they're *all* OK, so check that none of the
+      // submit records match any of the negative cases. To avoid checking yet
+      // more negative cases for CLOSED and FORCED, instead make sure at least
+      // one submit record is OK.
+      return Predicate.and(
+          new SubmittablePredicate(SubmitRecord.Status.OK),
+          Predicate.not(new SubmittablePredicate(SubmitRecord.Status.NOT_READY)),
+          Predicate.not(new SubmittablePredicate(SubmitRecord.Status.RULE_ERROR)));
     }
 
     if ("ignored".equalsIgnoreCase(value)) {
diff --git a/java/com/google/gerrit/server/query/change/GroupBackedUser.java b/java/com/google/gerrit/server/query/change/GroupBackedUser.java
index 3960813..d0d5735 100644
--- a/java/com/google/gerrit/server/query/change/GroupBackedUser.java
+++ b/java/com/google/gerrit/server/query/change/GroupBackedUser.java
@@ -23,21 +23,13 @@
 /**
  * Representation of a user that does not have a Gerrit account.
  *
- * <p>This user representation is intended to be used for two purposes:
+ * <p>This user representation is intended to be used to check permissions for groups:
  *
- * <ol>
- *   <li>Checking permissions for groups: There are occasions where we need to check if a resource -
- *       such as a change - is accessible by a group. Our entire {@link
- *       com.google.gerrit.server.permissions.PermissionBackend} works solely with {@link
- *       CurrentUser}. This class can be used to check permissions on a synthetic user with the
- *       given group memberships. Any real Gerrit user with the same group memberships would receive
- *       the same permission check results.
- *   <li>Checking permissions for an external user: In installations with external group systems,
- *       one might want to check what Gerrit permissions a user has, before or even without creating
- *       a Gerrit account. Such an external user has external group memberships only as well as
- *       internal groups that contain the user's external groups as subgroups. This class can be
- *       used to represent such an external user.
- * </ol>
+ * <p>There are occasions where we need to check if a resource - such as a change - is accessible by
+ * a group. Our entire {@link com.google.gerrit.server.permissions.PermissionBackend} works solely
+ * with {@link CurrentUser}. This class can be used to check permissions on a synthetic user with
+ * the given group memberships. Any real Gerrit user with the same group memberships would receive
+ * the same permission check results.
  */
 public final class GroupBackedUser extends CurrentUser {
   private final GroupMembership groups;
diff --git a/java/com/google/gerrit/server/restapi/change/CherryPickChange.java b/java/com/google/gerrit/server/restapi/change/CherryPickChange.java
index fdac552..5753874 100644
--- a/java/com/google/gerrit/server/restapi/change/CherryPickChange.java
+++ b/java/com/google/gerrit/server/restapi/change/CherryPickChange.java
@@ -42,6 +42,7 @@
 import com.google.gerrit.server.change.ChangeInserter;
 import com.google.gerrit.server.change.NotifyResolver;
 import com.google.gerrit.server.change.PatchSetInserter;
+import com.google.gerrit.server.change.ResetCherryPickOp;
 import com.google.gerrit.server.change.SetCherryPickOp;
 import com.google.gerrit.server.config.UrlFormatter;
 import com.google.gerrit.server.git.CodeReviewCommit;
@@ -281,20 +282,36 @@
                 input.parent, commitToCherryPick.getParentCount()));
       }
 
-      String message = Strings.nullToEmpty(input.message).trim();
-      message = message.isEmpty() ? commitToCherryPick.getFullMessage() : message;
+      // If the commit message is not set, the commit message of the source commit will be used.
+      String commitMessage = Strings.nullToEmpty(input.message);
+      commitMessage = commitMessage.isEmpty() ? commitToCherryPick.getFullMessage() : commitMessage;
 
-      PersonIdent committerIdent = identifiedUser.newCommitterIdent(timestamp, serverTimeZone);
+      String destChangeId = getDestinationChangeId(commitMessage, changeIdForNewChange);
 
-      final ObjectId generatedChangeId =
-          changeIdForNewChange != null
-              ? changeIdForNewChange
-              : CommitMessageUtil.generateChangeId();
-      String commitMessage = ChangeIdUtil.insertId(message, generatedChangeId).trim() + '\n';
+      ChangeData destChange = null;
+      if (destChangeId != null) {
+        // If "idForNewChange" is not null we must fail, since we are not expecting an already
+        // existing change.
+        destChange = getDestChangeWithVerification(destChangeId, dest, idForNewChange != null);
+      }
+
+      if (changeIdForNewChange != null) {
+        // If Change-Id was explicitly provided for the new change, override the value in commit
+        // message.
+        commitMessage = ChangeIdUtil.insertId(commitMessage, changeIdForNewChange, true);
+      } else if (destChangeId == null) {
+        // If commit message did not specify Change-Id, generate a new one and insert to the
+        // message.
+        commitMessage =
+            ChangeIdUtil.insertId(commitMessage, CommitMessageUtil.generateChangeId(), true);
+      }
+      commitMessage = CommitMessageUtil.checkAndSanitizeCommitMessage(commitMessage);
 
       CodeReviewCommit cherryPickCommit;
       ProjectState projectState =
           projectCache.get(dest.project()).orElseThrow(noSuchProject(dest.project()));
+      PersonIdent committerIdent = identifiedUser.newCommitterIdent(timestamp, serverTimeZone);
+
       try {
         MergeUtil mergeUtil;
         if (input.allowConflicts) {
@@ -316,87 +333,55 @@
                 input.parent - 1,
                 input.allowEmpty,
                 input.allowConflicts);
-
-        Change.Key changeKey;
-        final List<String> idList =
-            ChangeUtil.getChangeIdsFromFooter(cherryPickCommit, urlFormatter.get());
-        if (!idList.isEmpty()) {
-          final String idStr = idList.get(idList.size() - 1).trim();
-          changeKey = Change.key(idStr);
-        } else {
-          changeKey = Change.key("I" + generatedChangeId.name());
-        }
-
-        BranchNameKey newDest = BranchNameKey.create(project, destRef.getName());
-        List<ChangeData> destChanges =
-            queryProvider.get().setLimit(2).byBranchKey(newDest, changeKey);
-        if (destChanges.size() > 1) {
-          throw new InvalidChangeOperationException(
-              "Several changes with key "
-                  + changeKey
-                  + " reside on the same branch. "
-                  + "Cannot create a new patch set.");
-        }
-        try (BatchUpdate bu = batchUpdateFactory.create(project, identifiedUser, timestamp)) {
-          bu.setRepository(git, revWalk, oi);
-          bu.setNotify(resolveNotify(input));
-          Change.Id changeId;
-          String newTopic = null;
-          if (input.topic != null) {
-            newTopic = Strings.emptyToNull(input.topic.trim());
-          }
-          if (newTopic == null
-              && sourceChange != null
-              && !Strings.isNullOrEmpty(sourceChange.getTopic())) {
-            newTopic = sourceChange.getTopic() + "-" + newDest.shortName();
-          }
-          if (destChanges.size() == 1) {
-            // The change key exists on the destination branch. The cherry pick
-            // will be added as a new patch set. If "idForNewChange" is not null we must fail,
-            // since we are not expecting an already existing change.
-            if (idForNewChange != null) {
-              throw new InvalidChangeOperationException(
-                  String.format(
-                      "Expected that cherry-pick of commit %s with Change-Id %s to branch %s"
-                          + "in project %s creates a new change, but found existing change %d",
-                      sourceCommit.getName(),
-                      changeKey,
-                      dest.branch(),
-                      dest.project(),
-                      destChanges.get(0).getId().get()));
-            }
-            changeId =
-                insertPatchSet(
-                    bu,
-                    git,
-                    destChanges.get(0).notes(),
-                    cherryPickCommit,
-                    sourceChange.currentPatchSetId(),
-                    newTopic,
-                    workInProgress);
-          } else {
-            // Change key not found on destination branch. We can create a new
-            // change.
-            changeId =
-                createNewChange(
-                    bu,
-                    cherryPickCommit,
-                    dest.branch(),
-                    newTopic,
-                    project,
-                    sourceChange,
-                    sourceCommit,
-                    input,
-                    revertedChange,
-                    idForNewChange,
-                    workInProgress);
-          }
-          bu.execute();
-          return Result.create(changeId, cherryPickCommit.getFilesWithGitConflicts());
-        }
       } catch (MergeIdenticalTreeException | MergeConflictException e) {
         throw new IntegrationConflictException("Cherry pick failed: " + e.getMessage());
       }
+
+      try (BatchUpdate bu = batchUpdateFactory.create(project, identifiedUser, timestamp)) {
+        bu.setRepository(git, revWalk, oi);
+        bu.setNotify(resolveNotify(input));
+        Change.Id changeId;
+        String newTopic = null;
+        if (input.topic != null) {
+          newTopic = Strings.emptyToNull(input.topic.trim());
+        }
+        if (newTopic == null
+            && sourceChange != null
+            && !Strings.isNullOrEmpty(sourceChange.getTopic())) {
+          newTopic = sourceChange.getTopic() + "-" + dest.shortName();
+        }
+        if (destChange != null) {
+          // The change key exists on the destination branch. The cherry pick
+          // will be added as a new patch set.
+          changeId =
+              insertPatchSet(
+                  bu,
+                  git,
+                  destChange.notes(),
+                  cherryPickCommit,
+                  sourceChange,
+                  newTopic,
+                  workInProgress);
+        } else {
+          // Change key not found on destination branch. We can create a new
+          // change.
+          changeId =
+              createNewChange(
+                  bu,
+                  cherryPickCommit,
+                  dest.branch(),
+                  newTopic,
+                  project,
+                  sourceChange,
+                  sourceCommit,
+                  input,
+                  revertedChange,
+                  idForNewChange,
+                  workInProgress);
+        }
+        bu.execute();
+        return Result.create(changeId, cherryPickCommit.getFilesWithGitConflicts());
+      }
     }
   }
 
@@ -456,7 +441,7 @@
       Repository git,
       ChangeNotes destNotes,
       CodeReviewCommit cherryPickCommit,
-      PatchSet.Id sourcePatchSetId,
+      @Nullable Change sourceChange,
       String topic,
       @Nullable Boolean workInProgress)
       throws IOException {
@@ -469,7 +454,11 @@
       inserter.setWorkInProgress(workInProgress);
     }
     bu.addOp(destChange.getId(), inserter);
-    if (destChange.getCherryPickOf() == null
+    PatchSet.Id sourcePatchSetId = sourceChange == null ? null : sourceChange.currentPatchSetId();
+    // If sourceChange is not provided, reset cherryPickOf to avoid stale value.
+    if (sourcePatchSetId == null) {
+      bu.addOp(destChange.getId(), new ResetCherryPickOp());
+    } else if (destChange.getCherryPickOf() == null
         || !destChange.getCherryPickOf().equals(sourcePatchSetId)) {
       SetCherryPickOp cherryPickOfUpdater = setCherryPickOfFactory.create(sourcePatchSetId);
       bu.addOp(destChange.getId(), cherryPickOfUpdater);
@@ -571,4 +560,82 @@
 
     return stringBuilder.toString();
   }
+
+  /**
+   * Returns the Change-Id of destination change (as intended by the caller of cherry-pick
+   * operation).
+   *
+   * <p>The Change-Id can be provided in one of the following ways:
+   *
+   * <ul>
+   *   <li>Explicitly provided for the new change.
+   *   <li>Provided in the input commit message.
+   *   <li>Taken from the source commit if commit message was not set.
+   * </ul>
+   *
+   * Otherwise should be generated.
+   *
+   * @param commitMessage the commit message, as intended by the caller of cherry-pick operation.
+   * @param changeIdForNewChange the explicitly provided Change-Id for the new change.
+   * @return The Change-Id of destination change, {@code null} if Change-Id was not provided by the
+   *     caller of cherry-pick operation and should be generated.
+   */
+  @Nullable
+  private String getDestinationChangeId(
+      String commitMessage, @Nullable ObjectId changeIdForNewChange) {
+    if (changeIdForNewChange != null) {
+      return CommitMessageUtil.getChangeIdFromObjectId(changeIdForNewChange);
+    } else {
+      return CommitMessageUtil.getChangeIdFromCommitMessageFooter(commitMessage).orElse(null);
+    }
+  }
+
+  /**
+   * Returns the change from the destination branch, if it exists and is valid for the cherry-pick.
+   *
+   * @param destChangeId the Change-ID of the change in the destination branch.
+   * @param destBranch the branch to search by the Change-ID.
+   * @param verifyIsMissing if {@code true}, verifies that the change should be missing in the
+   *     destination branch.
+   * @return the verified change or {@code null} if the change was not found.
+   * @throws InvalidChangeOperationException if the change was found but failed validation
+   */
+  @Nullable
+  private ChangeData getDestChangeWithVerification(
+      String destChangeId, BranchNameKey destBranch, boolean verifyIsMissing)
+      throws InvalidChangeOperationException {
+    List<ChangeData> destChanges =
+        queryProvider.get().setLimit(2).byBranchKey(destBranch, Change.key(destChangeId));
+    if (destChanges.size() > 1) {
+      throw new InvalidChangeOperationException(
+          "Several changes with key "
+              + destChangeId
+              + " reside on the same branch. "
+              + "Cannot create a new patch set.");
+    }
+    if (destChanges.size() == 1 && verifyIsMissing) {
+      throw new InvalidChangeOperationException(
+          String.format(
+              "Expected that cherry-pick with Change-Id %s to branch %s "
+                  + "in project %s creates a new change, but found existing change %d",
+              destChangeId,
+              destBranch.branch(),
+              destBranch.project().get(),
+              destChanges.get(0).getId().get()));
+    }
+    ChangeData destChange = destChanges.size() == 1 ? destChanges.get(0) : null;
+
+    if (destChange != null && destChange.change().isClosed()) {
+      throw new InvalidChangeOperationException(
+          String.format(
+              "Cherry-pick with Change-Id %s could not update the existing change %d "
+                  + "in destination branch %s of project %s, because the change was closed (%s)",
+              destChangeId,
+              destChange.getId().get(),
+              destBranch.branch(),
+              destBranch.project(),
+              destChange.change().getStatus().name()));
+    }
+    return destChange;
+  }
 }
diff --git a/java/com/google/gerrit/server/restapi/change/CreateChange.java b/java/com/google/gerrit/server/restapi/change/CreateChange.java
index 52887e0..c392bd1 100644
--- a/java/com/google/gerrit/server/restapi/change/CreateChange.java
+++ b/java/com/google/gerrit/server/restapi/change/CreateChange.java
@@ -223,6 +223,12 @@
       throw new BadRequestException("branch must be non-empty");
     }
     input.branch = RefNames.fullName(input.branch);
+    if (!isBranchAllowed(input.branch)) {
+      throw new BadRequestException(
+          "Cannot create a change on ref "
+              + input.branch
+              + ". Gerrit internal refs and refs/tags/* are not allowed.");
+    }
 
     String subject = Strings.nullToEmpty(input.subject);
     subject = subject.replaceAll("(?m)^#.*$\n?", "").trim();
@@ -292,6 +298,11 @@
     }
   }
 
+  /** Changes are allowed to be created on any ref that is not Gerrit internal or a tag ref. */
+  private boolean isBranchAllowed(String branch) {
+    return !RefNames.isGerritRef(branch) && !branch.startsWith(RefNames.REFS_TAGS);
+  }
+
   private void checkRequiredPermissions(
       Project.NameKey project, String refName, @Nullable AccountInput author)
       throws ResourceNotFoundException, AuthException, PermissionBackendException {
diff --git a/java/com/google/gerrit/server/restapi/change/Move.java b/java/com/google/gerrit/server/restapi/change/Move.java
index 577174f..8ec394c 100644
--- a/java/com/google/gerrit/server/restapi/change/Move.java
+++ b/java/com/google/gerrit/server/restapi/change/Move.java
@@ -52,6 +52,7 @@
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.notedb.ChangeUpdate;
+import com.google.gerrit.server.permissions.GlobalPermission;
 import com.google.gerrit.server.permissions.PermissionBackend;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.gerrit.server.project.ProjectCache;
@@ -140,6 +141,18 @@
     // Not allowed to move if the current patch set is locked.
     psUtil.checkPatchSetNotLocked(rsrc.getNotes());
 
+    // Keeping all votes can be confusing in the context of the destination branch, see the
+    // discussion in
+    // https://gerrit-review.googlesource.com/c/gerrit/+/129171
+    // Only administrators are allowed to keep all labels at their own risk.
+    try {
+      if (input.keepAllVotes) {
+        permissionBackend.user(caller).check(GlobalPermission.ADMINISTRATE_SERVER);
+      }
+    } catch (AuthException denied) {
+      throw new AuthException("move is not permitted with keepAllVotes option", denied);
+    }
+
     // Move requires abandoning this change, and creating a new change.
     try {
       rsrc.permissions().check(ABANDON);
@@ -226,7 +239,9 @@
       update.setBranch(newDestKey.branch());
       change.setDest(newDestKey);
 
-      updateApprovals(ctx, update, psId, projectKey);
+      if (!input.keepAllVotes) {
+        updateApprovals(ctx, update, psId, projectKey);
+      }
 
       StringBuilder msgBuf = new StringBuilder();
       msgBuf.append("Change destination moved from ");
diff --git a/java/com/google/gerrit/server/restapi/change/OnPostReview.java b/java/com/google/gerrit/server/restapi/change/OnPostReview.java
new file mode 100644
index 0000000..b179d02
--- /dev/null
+++ b/java/com/google/gerrit/server/restapi/change/OnPostReview.java
@@ -0,0 +1,47 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.restapi.change;
+
+import com.google.gerrit.entities.PatchSet;
+import com.google.gerrit.extensions.annotations.ExtensionPoint;
+import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import java.util.Map;
+import java.util.Optional;
+
+/** Extension point that is invoked on post review. */
+@ExtensionPoint
+public interface OnPostReview {
+  /**
+   * Allows implementors to return a message that should be included into the change message that is
+   * posted on post review.
+   *
+   * @param user the user that posts the review
+   * @param changeNotes the change on which post review is performed
+   * @param patchSet the patch set on which post review is performed
+   * @param oldApprovals old approvals that changed as result of post review
+   * @param approvals all current approvals
+   * @return message that should be included into the change message that is posted on post review,
+   *     {@link Optional#empty()} if the change message should not be extended
+   */
+  default Optional<String> getChangeMessageAddOn(
+      IdentifiedUser user,
+      ChangeNotes changeNotes,
+      PatchSet patchSet,
+      Map<String, Short> oldApprovals,
+      Map<String, Short> approvals) {
+    return Optional.empty();
+  }
+}
diff --git a/java/com/google/gerrit/server/restapi/change/PostReview.java b/java/com/google/gerrit/server/restapi/change/PostReview.java
index 604c87f..bf9990c 100644
--- a/java/com/google/gerrit/server/restapi/change/PostReview.java
+++ b/java/com/google/gerrit/server/restapi/change/PostReview.java
@@ -30,6 +30,7 @@
 import static javax.servlet.http.HttpServletResponse.SC_BAD_REQUEST;
 
 import com.google.auto.value.AutoValue;
+import com.google.common.base.Joiner;
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
@@ -177,8 +178,10 @@
   private final ProjectCache projectCache;
   private final PermissionBackend permissionBackend;
   private final PluginSetContext<CommentValidator> commentValidators;
+  private final PluginSetContext<OnPostReview> onPostReviews;
   private final ReplyAttentionSetUpdates replyAttentionSetUpdates;
   private final boolean strictLabels;
+  private final boolean publishPatchSetLevelComment;
 
   @Inject
   PostReview(
@@ -202,6 +205,7 @@
       ProjectCache projectCache,
       PermissionBackend permissionBackend,
       PluginSetContext<CommentValidator> commentValidators,
+      PluginSetContext<OnPostReview> onPostReviews,
       ReplyAttentionSetUpdates replyAttentionSetUpdates) {
     this.updateFactory = updateFactory;
     this.changeResourceFactory = changeResourceFactory;
@@ -222,8 +226,11 @@
     this.projectCache = projectCache;
     this.permissionBackend = permissionBackend;
     this.commentValidators = commentValidators;
+    this.onPostReviews = onPostReviews;
     this.replyAttentionSetUpdates = replyAttentionSetUpdates;
     this.strictLabels = gerritConfig.getBoolean("change", "strictLabels", false);
+    this.publishPatchSetLevelComment =
+        gerritConfig.getBoolean("event", "comment-added", "publishPatchSetLevelComment", true);
   }
 
   @Override
@@ -941,14 +948,23 @@
               String.format("Repository %s not found", ctx.getProject().get()), ex);
         }
       }
+      String comment = message.getMessage();
+      if (publishPatchSetLevelComment) {
+        // TODO(davido): Remove this workaround when patch set level comments are exposed in comment
+        // added event. For backwards compatibility, patchset level comment has a higher priority
+        // than change message and should be used as comment in comment added event.
+        if (in.comments != null && in.comments.containsKey(PATCHSET_LEVEL)) {
+          List<CommentInput> patchSetLevelComments = in.comments.get(PATCHSET_LEVEL);
+          if (patchSetLevelComments != null && !patchSetLevelComments.isEmpty()) {
+            CommentInput firstComment = patchSetLevelComments.get(0);
+            if (!Strings.isNullOrEmpty(firstComment.message)) {
+              comment = String.format("Patch Set %s:\n\n%s", psId.get(), firstComment.message);
+            }
+          }
+        }
+      }
       commentAdded.fire(
-          notes.getChange(),
-          ps,
-          user.state(),
-          message.getMessage(),
-          approvals,
-          oldApprovals,
-          ctx.getWhen());
+          notes.getChange(), ps, user.state(), comment, approvals, oldApprovals, ctx.getWhen());
     }
 
     private boolean insertComments(ChangeContext ctx, List<RobotComment> newRobotComments)
@@ -1413,6 +1429,23 @@
       } else if (in.ready) {
         buf.append("\n\n" + START_REVIEW_MESSAGE);
       }
+
+      List<String> pluginMessages = new ArrayList<>();
+      onPostReviews.runEach(
+          onPostReview ->
+              onPostReview
+                  .getChangeMessageAddOn(user, ctx.getNotes(), ps, oldApprovals, approvals)
+                  .ifPresent(
+                      pluginMessage ->
+                          pluginMessages.add(
+                              !pluginMessage.endsWith("\n")
+                                  ? pluginMessage + "\n"
+                                  : pluginMessage)));
+      if (!pluginMessages.isEmpty()) {
+        buf.append("\n\n");
+        buf.append(Joiner.on("\n").join(pluginMessages));
+      }
+
       if (buf.length() == 0) {
         return false;
       }
diff --git a/java/com/google/gerrit/server/restapi/change/PreviewSubmit.java b/java/com/google/gerrit/server/restapi/change/PreviewSubmit.java
index ed6c0a5..4acf809 100644
--- a/java/com/google/gerrit/server/restapi/change/PreviewSubmit.java
+++ b/java/com/google/gerrit/server/restapi/change/PreviewSubmit.java
@@ -42,7 +42,6 @@
 import com.google.gerrit.server.update.UpdateException;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
-import com.google.inject.Singleton;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Collection;
@@ -56,7 +55,6 @@
 import org.eclipse.jgit.transport.ReceiveCommand;
 import org.kohsuke.args4j.Option;
 
-@Singleton
 public class PreviewSubmit implements RestReadView<RevisionResource> {
   private static final int MAX_DEFAULT_BUNDLE_SIZE = 100 * 1024 * 1024;
 
diff --git a/java/com/google/gerrit/server/restapi/change/QueryChanges.java b/java/com/google/gerrit/server/restapi/change/QueryChanges.java
index 0fec476..3c8157b 100644
--- a/java/com/google/gerrit/server/restapi/change/QueryChanges.java
+++ b/java/com/google/gerrit/server/restapi/change/QueryChanges.java
@@ -27,8 +27,11 @@
 import com.google.gerrit.index.query.QueryParseException;
 import com.google.gerrit.index.query.QueryRequiresAuthException;
 import com.google.gerrit.index.query.QueryResult;
+import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.DynamicOptions;
 import com.google.gerrit.server.change.ChangeJson;
+import com.google.gerrit.server.permissions.GlobalPermission;
+import com.google.gerrit.server.permissions.PermissionBackend;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.query.change.ChangeQueryBuilder;
@@ -49,10 +52,13 @@
   private final ChangeQueryBuilder qb;
   private final Provider<ChangeQueryProcessor> queryProcessorProvider;
   private final HashMap<String, DynamicOptions.DynamicBean> dynamicBeans = new HashMap<>();
+  private final Provider<CurrentUser> userProvider;
+  private final PermissionBackend permissionBackend;
   private EnumSet<ListChangesOption> options;
   private Integer limit;
   private Integer start;
   private Boolean noLimit;
+  private Boolean skipVisibility;
 
   @Option(
       name = "--query",
@@ -94,6 +100,15 @@
     this.noLimit = on;
   }
 
+  @Option(name = "--skip-visibility", usage = "Skip visibility check, only for administrators")
+  public void skipVisibility(boolean on) throws AuthException, PermissionBackendException {
+    if (on) {
+      CurrentUser user = userProvider.get();
+      permissionBackend.user(user).check(GlobalPermission.ADMINISTRATE_SERVER);
+    }
+    skipVisibility = on;
+  }
+
   @Override
   public void setDynamicBean(String plugin, DynamicOptions.DynamicBean dynamicBean) {
     dynamicBeans.put(plugin, dynamicBean);
@@ -103,10 +118,14 @@
   QueryChanges(
       ChangeJson.Factory json,
       ChangeQueryBuilder qb,
-      Provider<ChangeQueryProcessor> queryProcessorProvider) {
+      Provider<ChangeQueryProcessor> queryProcessorProvider,
+      Provider<CurrentUser> userProvider,
+      PermissionBackend permissionBackend) {
     this.json = json;
     this.qb = qb;
     this.queryProcessorProvider = queryProcessorProvider;
+    this.userProvider = userProvider;
+    this.permissionBackend = permissionBackend;
 
     options = EnumSet.noneOf(ListChangesOption.class);
   }
@@ -152,6 +171,9 @@
     if (noLimit != null) {
       queryProcessor.setNoLimit(noLimit);
     }
+    if (skipVisibility != null) {
+      queryProcessor.enforceVisibility(!skipVisibility);
+    }
     dynamicBeans.forEach((p, b) -> queryProcessor.setDynamicBean(p, b));
 
     if (queries == null || queries.isEmpty()) {
diff --git a/java/com/google/gerrit/server/restapi/group/CreateGroup.java b/java/com/google/gerrit/server/restapi/group/CreateGroup.java
index 74ca721..613c805 100644
--- a/java/com/google/gerrit/server/restapi/group/CreateGroup.java
+++ b/java/com/google/gerrit/server/restapi/group/CreateGroup.java
@@ -54,6 +54,7 @@
 import com.google.gerrit.server.notedb.Sequences;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.gerrit.server.plugincontext.PluginSetContext;
+import com.google.gerrit.server.util.time.TimeUtil;
 import com.google.gerrit.server.validators.GroupCreationValidationListener;
 import com.google.gerrit.server.validators.ValidationException;
 import com.google.inject.Inject;
@@ -66,6 +67,7 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Optional;
+import java.util.TimeZone;
 import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.PersonIdent;
@@ -75,7 +77,7 @@
 public class CreateGroup
     implements RestCollectionCreateView<TopLevelResource, GroupResource, GroupInput> {
   private final Provider<IdentifiedUser> self;
-  private final PersonIdent serverIdent;
+  private final TimeZone serverTimeZone;
   private final Provider<GroupsUpdate> groupsUpdateProvider;
   private final GroupCache groupCache;
   private final GroupResolver groups;
@@ -89,7 +91,7 @@
   @Inject
   CreateGroup(
       Provider<IdentifiedUser> self,
-      @GerritPersonIdent PersonIdent serverIdent,
+      @GerritPersonIdent Provider<PersonIdent> serverIdent,
       @UserInitiated Provider<GroupsUpdate> groupsUpdateProvider,
       GroupCache groupCache,
       GroupResolver groups,
@@ -100,7 +102,7 @@
       @GerritServerConfig Config cfg,
       Sequences sequences) {
     this.self = self;
-    this.serverIdent = serverIdent;
+    this.serverTimeZone = serverIdent.get().getTimeZone();
     this.groupsUpdateProvider = groupsUpdateProvider;
     this.groupCache = groupCache;
     this.groups = groups;
@@ -210,7 +212,7 @@
             createGroupArgs.uuid,
             GroupUuid.make(
                 createGroupArgs.getGroupName(),
-                self.get().newCommitterIdent(serverIdent.getWhen(), serverIdent.getTimeZone())));
+                self.get().newCommitterIdent(TimeUtil.nowTs(), serverTimeZone)));
     InternalGroupCreation groupCreation =
         InternalGroupCreation.builder()
             .setGroupUUID(uuid)
diff --git a/java/com/google/gerrit/server/restapi/project/CreateChange.java b/java/com/google/gerrit/server/restapi/project/CreateChange.java
index dbcd8c9..59efd06 100644
--- a/java/com/google/gerrit/server/restapi/project/CreateChange.java
+++ b/java/com/google/gerrit/server/restapi/project/CreateChange.java
@@ -59,8 +59,8 @@
       throw new AuthException("Authentication required");
     }
 
-    if (!Strings.isNullOrEmpty(input.project)) {
-      throw new BadRequestException("may not specify project");
+    if (!Strings.isNullOrEmpty(input.project) && !rsrc.getName().equals(input.project)) {
+      throw new BadRequestException("project must match URL");
     }
 
     input.project = rsrc.getName();
diff --git a/java/com/google/gerrit/server/restapi/project/CreateDashboard.java b/java/com/google/gerrit/server/restapi/project/CreateDashboard.java
index e9a0d7f..34d6696 100644
--- a/java/com/google/gerrit/server/restapi/project/CreateDashboard.java
+++ b/java/com/google/gerrit/server/restapi/project/CreateDashboard.java
@@ -26,11 +26,9 @@
 import com.google.gerrit.server.project.ProjectResource;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
-import com.google.inject.Singleton;
 import java.io.IOException;
 import org.kohsuke.args4j.Option;
 
-@Singleton
 public class CreateDashboard
     implements RestCollectionCreateView<ProjectResource, DashboardResource, SetDashboardInput> {
   private final Provider<SetDefaultDashboard> setDefault;
diff --git a/java/com/google/gerrit/server/restapi/project/ListBranches.java b/java/com/google/gerrit/server/restapi/project/ListBranches.java
index fecdc8e..2c26933 100644
--- a/java/com/google/gerrit/server/restapi/project/ListBranches.java
+++ b/java/com/google/gerrit/server/restapi/project/ListBranches.java
@@ -143,7 +143,11 @@
   BranchInfo toBranchInfo(BranchResource rsrc)
       throws IOException, ResourceNotFoundException, PermissionBackendException {
     try (Repository db = repoManager.openRepository(rsrc.getNameKey())) {
-      Ref r = db.exactRef(rsrc.getRef());
+      String refName = rsrc.getRef();
+      if (RefNames.isRefsUsersSelf(refName, rsrc.getProjectState().isAllUsers())) {
+        refName = RefNames.refsUsers(rsrc.getUser().getAccountId());
+      }
+      Ref r = db.exactRef(refName);
       if (r == null) {
         throw new ResourceNotFoundException();
       }
diff --git a/java/com/google/gerrit/server/schema/AllProjectsCreator.java b/java/com/google/gerrit/server/schema/AllProjectsCreator.java
index 6faaec5..9907b1c 100644
--- a/java/com/google/gerrit/server/schema/AllProjectsCreator.java
+++ b/java/com/google/gerrit/server/schema/AllProjectsCreator.java
@@ -176,14 +176,16 @@
           grant(config, refsFor, Permission.ADD_PATCH_SET, registered);
         });
 
+    config.upsertAccessSection(
+        "refs/meta/version",
+        version -> {
+          grant(config, version, Permission.READ, anonymous);
+        });
+
     grant(config, heads, codeReviewLabel, -1, 1, registered);
     grant(config, heads, Permission.FORGE_AUTHOR, registered);
-
-    config.upsertAccessSection(
-        "refs/*",
-        all -> {
-          grant(config, all, Permission.REVERT, registered);
-        });
+    grant(config, heads, Permission.READ, anonymous);
+    grant(config, heads, Permission.REVERT, registered);
 
     config.upsertAccessSection(
         "refs/for/" + AccessSection.ALL,
@@ -213,7 +215,7 @@
     config.upsertAccessSection(
         AccessSection.ALL,
         all -> {
-          grant(config, all, Permission.READ, adminsGroup, anonymous);
+          grant(config, all, Permission.READ, adminsGroup);
         });
 
     config.upsertAccessSection(
diff --git a/java/com/google/gerrit/server/schema/testing/AllProjectsCreatorTestUtil.java b/java/com/google/gerrit/server/schema/testing/AllProjectsCreatorTestUtil.java
index 5485192..39e3a59 100644
--- a/java/com/google/gerrit/server/schema/testing/AllProjectsCreatorTestUtil.java
+++ b/java/com/google/gerrit/server/schema/testing/AllProjectsCreatorTestUtil.java
@@ -54,14 +54,14 @@
       ImmutableList.of(
           "[access \"refs/*\"]",
           "  read = group Administrators",
-          "  read = group Anonymous Users",
-          "  revert = group Registered Users",
           "[access \"refs/for/*\"]",
           "  addPatchSet = group Registered Users",
           "[access \"refs/for/refs/*\"]",
           "  push = group Registered Users",
           "  pushMerge = group Registered Users",
           "[access \"refs/heads/*\"]",
+          "  read = group Anonymous Users",
+          "  revert = group Registered Users",
           "  create = group Administrators",
           "  create = group Project Owners",
           "  editTopicName = +force group Administrators",
@@ -88,6 +88,8 @@
           "  read = group Project Owners",
           "  submit = group Administrators",
           "  submit = group Project Owners",
+          "[access \"refs/meta/version\"]",
+          "  read = group Anonymous Users",
           "[access \"refs/tags/*\"]",
           "  create = group Administrators",
           "  create = group Project Owners",
diff --git a/java/com/google/gerrit/server/update/RetryHelper.java b/java/com/google/gerrit/server/update/RetryHelper.java
index 2db625b..409c808 100644
--- a/java/com/google/gerrit/server/update/RetryHelper.java
+++ b/java/com/google/gerrit/server/update/RetryHelper.java
@@ -481,7 +481,7 @@
                   if (!traceContext.isTracing()) {
                     String traceId = "retry-on-failure-" + new RequestId();
                     traceContext.addTag(RequestId.Type.TRACE_ID, traceId).forceLogging();
-                    logger.atFine().withCause(t).log(
+                    logger.atWarning().withCause(t).log(
                         "AutoRetry: %s failed, retry with tracing enabled (cause = %s)",
                         actionName, cause);
                     opts.onAutoTrace().ifPresent(c -> c.accept(traceId));
@@ -492,7 +492,7 @@
                   // A non-recoverable failure occurred. We retried the operation with tracing
                   // enabled and it failed again. Log the failure so that admin can see if it
                   // differs from the failure that triggered the retry.
-                  logger.atFine().withCause(t).log(
+                  logger.atWarning().withCause(t).log(
                       "AutoRetry: auto-retry of %s has failed (cause = %s)", actionName, cause);
                   metrics.failuresOnAutoRetryCount.increment(actionType, actionName, cause);
                   return false;
@@ -504,7 +504,7 @@
       return executeWithTimeoutCount(actionType, action, opts, retryerBuilder.build(), listener);
     } finally {
       if (listener.getAttemptCount() > 1) {
-        logger.atFine().log("%s was attempted %d times", actionType, listener.getAttemptCount());
+        logger.atWarning().log("%s was attempted %d times", actionType, listener.getAttemptCount());
         metrics.attemptCounts.incrementBy(
             actionType,
             opts.actionName().orElse("N/A"),
diff --git a/java/com/google/gerrit/server/util/CommitMessageUtil.java b/java/com/google/gerrit/server/util/CommitMessageUtil.java
index 1c8ce0c..55e3951 100644
--- a/java/com/google/gerrit/server/util/CommitMessageUtil.java
+++ b/java/com/google/gerrit/server/util/CommitMessageUtil.java
@@ -22,13 +22,19 @@
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectInserter;
+import org.eclipse.jgit.util.ChangeIdUtil;
 
 /** Utility functions to manipulate commit messages. */
 public class CommitMessageUtil {
   private static final SecureRandom rng;
+  private static final Pattern changeIdFooterPattern =
+      Pattern.compile("Change-Id: *(I[a-f0-9]{40})");
 
   static {
     try {
@@ -71,6 +77,31 @@
   }
 
   public static Change.Key generateKey() {
-    return Change.key("I" + generateChangeId().name());
+    return Change.key(getChangeIdFromObjectId(generateChangeId()));
+  }
+
+  public static String getChangeIdFromObjectId(ObjectId objectId) {
+    return "I" + objectId.name();
+  }
+
+  /**
+   * Return the value of Change-Id from the commit message footer.
+   *
+   * <p>The behaviour matches {@link org.eclipse.jgit.util.ChangeIdUtil}. If more than one matching
+   * Change-Id footer is found, return the value of the last one.
+   *
+   * @param commitMessage commit message to get Change-Id from.
+   * @return {@link Optional} value of Change-Id footer in the commit message.
+   */
+  public static Optional<String> getChangeIdFromCommitMessageFooter(String commitMessage) {
+    int indexOfChangeId = ChangeIdUtil.indexOfChangeId(commitMessage, "\n");
+    if (indexOfChangeId == -1) {
+      return Optional.empty();
+    }
+    Matcher matcher = changeIdFooterPattern.matcher(commitMessage);
+    if (matcher.find(indexOfChangeId)) {
+      return Optional.of(matcher.group(1));
+    }
+    return Optional.empty();
   }
 }
diff --git a/java/com/google/gerrit/server/util/PluginLogFile.java b/java/com/google/gerrit/server/util/PluginLogFile.java
index 8235623..345e1b3 100644
--- a/java/com/google/gerrit/server/util/PluginLogFile.java
+++ b/java/com/google/gerrit/server/util/PluginLogFile.java
@@ -16,7 +16,6 @@
 
 import com.google.gerrit.extensions.events.LifecycleListener;
 import com.google.gerrit.extensions.systemstatus.ServerInformation;
-import org.apache.log4j.AsyncAppender;
 import org.apache.log4j.Layout;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
@@ -38,12 +37,11 @@
 
   @Override
   public void start() {
-    AsyncAppender asyncAppender = systemLog.createAsyncAppender(logName, layout, true, true);
     Logger logger = LogManager.getLogger(logName);
     if (logger.getAppender(logName) == null) {
-      synchronized (this) {
+      synchronized (systemLog) {
         if (logger.getAppender(logName) == null) {
-          logger.addAppender(asyncAppender);
+          logger.addAppender(systemLog.createAsyncAppender(logName, layout, true, true));
         }
       }
     }
diff --git a/java/com/google/gerrit/sshd/BaseCommand.java b/java/com/google/gerrit/sshd/BaseCommand.java
index fe03770..0ce6766 100644
--- a/java/com/google/gerrit/sshd/BaseCommand.java
+++ b/java/com/google/gerrit/sshd/BaseCommand.java
@@ -51,6 +51,7 @@
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.nio.charset.Charset;
+import java.util.Arrays;
 import java.util.concurrent.Future;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.atomic.AtomicReference;
@@ -360,7 +361,7 @@
       }
       m.append(" during ");
       m.append(context.getCommandLine());
-      logger.atSevere().withCause(e).log(m.toString());
+      logCauseIfRelevant(e, m);
     }
 
     if (e instanceof Failure) {
@@ -387,6 +388,20 @@
     return 128;
   }
 
+  private void logCauseIfRelevant(Throwable e, StringBuilder message) {
+    String zeroLength = "length=0";
+    String streamAlreadyClosed = "stream is already closed";
+    boolean isZeroLength = false;
+
+    if (streamAlreadyClosed.equals(e.getMessage())) {
+      StackTraceElement[] stackTrace = e.getStackTrace();
+      isZeroLength = Arrays.stream(stackTrace).anyMatch(s -> s.toString().contains(zeroLength));
+    }
+    if (!isZeroLength) {
+      logger.atSevere().withCause(e).log(message.toString());
+    }
+  }
+
   protected UnloggedFailure die(String msg) {
     return new UnloggedFailure(1, "fatal: " + msg);
   }
diff --git a/javatests/com/google/gerrit/acceptance/WaitUtilTest.java b/javatests/com/google/gerrit/acceptance/WaitUtilTest.java
new file mode 100644
index 0000000..565da9c
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/WaitUtilTest.java
@@ -0,0 +1,40 @@
+// Copyright (C) 2019 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;
+
+import static com.google.gerrit.acceptance.WaitUtil.waitUntil;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
+
+import java.time.Duration;
+import org.junit.Test;
+
+public class WaitUtilTest {
+
+  @Test
+  public void shouldFailWhenConditionNotMetWithinTimeout() throws Exception {
+    assertThrows(
+        InterruptedException.class,
+        () -> waitUntil(() -> returnTrue() == false, Duration.ofSeconds(1)));
+  }
+
+  @Test
+  public void shouldNotFailWhenConditionIsMetWithinTimeout() throws Exception {
+    waitUntil(() -> returnTrue() == true, Duration.ofSeconds(1));
+  }
+
+  private static boolean returnTrue() {
+    return true;
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/api/change/ChangeSubmitRequirementIT.java b/javatests/com/google/gerrit/acceptance/api/change/ChangeSubmitRequirementIT.java
index fd9af0e..eb5b9b0 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/ChangeSubmitRequirementIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/ChangeSubmitRequirementIT.java
@@ -22,6 +22,8 @@
 import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.entities.SubmitRequirement;
 import com.google.gerrit.extensions.annotations.Exports;
+import com.google.gerrit.extensions.api.changes.ChangeApi;
+import com.google.gerrit.extensions.api.changes.ReviewInput;
 import com.google.gerrit.extensions.common.ChangeInfo;
 import com.google.gerrit.extensions.common.SubmitRequirementInfo;
 import com.google.gerrit.extensions.config.FactoryModule;
@@ -33,7 +35,6 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
-import java.util.concurrent.atomic.AtomicBoolean;
 import org.junit.Test;
 
 public class ChangeSubmitRequirementIT extends AbstractDaemonTest {
@@ -93,20 +94,113 @@
     assertThat(result.get(0).requirements).containsExactly(reqInfo);
   }
 
+  @Test
+  public void submittableQueryRuleNotReady() throws Exception {
+    ChangeApi change = newChangeApi();
+
+    // Satisfy the default rule.
+    approveChange(change);
+
+    // The custom rule is NOT_READY.
+    rule.block(true);
+    change.index();
+
+    assertThat(queryIsSubmittable()).isEmpty();
+  }
+
+  @Test
+  public void submittableQueryRuleError() throws Exception {
+    ChangeApi change = newChangeApi();
+
+    // Satisfy the default rule.
+    approveChange(change);
+
+    rule.status(Optional.of(SubmitRecord.Status.RULE_ERROR));
+    change.index();
+
+    assertThat(queryIsSubmittable()).isEmpty();
+  }
+
+  @Test
+  public void submittableQueryDefaultRejected() throws Exception {
+    ChangeApi change = newChangeApi();
+
+    // CodeReview:-2 the change, causing the default rule to fail.
+    rejectChange(change);
+
+    rule.status(Optional.of(SubmitRecord.Status.OK));
+    change.index();
+
+    assertThat(queryIsSubmittable()).isEmpty();
+  }
+
+  @Test
+  public void submittableQueryRuleOk() throws Exception {
+    ChangeApi change = newChangeApi();
+
+    // Satisfy the default rule.
+    approveChange(change);
+
+    rule.status(Optional.of(SubmitRecord.Status.OK));
+    change.index();
+
+    List<ChangeInfo> result = queryIsSubmittable();
+    assertThat(result).hasSize(1);
+    assertThat(result.get(0).changeId).isEqualTo(change.info().changeId);
+  }
+
+  @Test
+  public void submittableQueryRuleNoRecord() throws Exception {
+    ChangeApi change = newChangeApi();
+
+    // Satisfy the default rule.
+    approveChange(change);
+
+    // Our custom rule isn't providing any submit records.
+    rule.status(Optional.empty());
+    change.index();
+
+    // is:submittable should return the change, since it was approved and the custom rule is not
+    // blocking it.
+    List<ChangeInfo> result = queryIsSubmittable();
+    assertThat(result).hasSize(1);
+    assertThat(result.get(0).changeId).isEqualTo(change.info().changeId);
+  }
+
+  private List<ChangeInfo> queryIsSubmittable() throws Exception {
+    return gApi.changes().query("is:submittable project:" + project.get()).get();
+  }
+
+  private ChangeApi newChangeApi() throws Exception {
+    return gApi.changes().id(createChange().getChangeId());
+  }
+
+  private void approveChange(ChangeApi changeApi) throws Exception {
+    changeApi.current().review(ReviewInput.approve());
+  }
+
+  private void rejectChange(ChangeApi changeApi) throws Exception {
+    changeApi.current().review(ReviewInput.reject());
+  }
+
   @Singleton
   private static class CustomSubmitRule implements SubmitRule {
-    private final AtomicBoolean block = new AtomicBoolean(true);
+    private Optional<SubmitRecord.Status> recordStatus = Optional.empty();
 
     public void block(boolean block) {
-      this.block.set(block);
+      this.status(block ? Optional.of(SubmitRecord.Status.NOT_READY) : Optional.empty());
+    }
+
+    public void status(Optional<SubmitRecord.Status> status) {
+      this.recordStatus = status;
     }
 
     @Override
     public Optional<SubmitRecord> evaluate(ChangeData changeData) {
-      if (block.get()) {
+      if (this.recordStatus.isPresent()) {
         SubmitRecord record = new SubmitRecord();
         record.labels = new ArrayList<>();
-        record.status = SubmitRecord.Status.NOT_READY;
+        record.status = this.recordStatus.get();
         record.requirements = ImmutableList.of(req);
         return Optional.of(record);
       }
diff --git a/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java b/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
index 7d73374..029d5a2 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/PostReviewIT.java
@@ -29,9 +29,16 @@
 import com.google.common.collect.Iterables;
 import com.google.common.truth.Correspondence;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.ExtensionRegistry;
+import com.google.gerrit.acceptance.ExtensionRegistry.Registration;
 import com.google.gerrit.acceptance.PushOneCommit;
+import com.google.gerrit.acceptance.TestAccount;
 import com.google.gerrit.acceptance.config.GerritConfig;
 import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
+import com.google.gerrit.common.Nullable;
+import com.google.gerrit.entities.Account;
+import com.google.gerrit.entities.Change;
+import com.google.gerrit.entities.PatchSet;
 import com.google.gerrit.extensions.annotations.Exports;
 import com.google.gerrit.extensions.api.changes.DraftInput;
 import com.google.gerrit.extensions.api.changes.ReviewInput;
@@ -49,6 +56,9 @@
 import com.google.gerrit.extensions.validators.CommentForValidation;
 import com.google.gerrit.extensions.validators.CommentValidationContext;
 import com.google.gerrit.extensions.validators.CommentValidator;
+import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.notedb.ChangeNotes;
+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.TestCommentHelper;
@@ -58,6 +68,7 @@
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
@@ -69,6 +80,7 @@
   @Inject private CommentValidator mockCommentValidator;
   @Inject private TestCommentHelper testCommentHelper;
   @Inject private RequestScopeOperations requestScopeOperations;
+  @Inject private ExtensionRegistry extensionRegistry;
 
   private static final String COMMENT_TEXT = "The comment text";
   private static final CommentForValidation FILE_COMMENT_FOR_VALIDATION =
@@ -474,6 +486,124 @@
     assertThat(reviewer._accountId).isEqualTo(user.id().get());
   }
 
+  @Test
+  public void extendChangeMessageFromPlugin() throws Exception {
+    PushOneCommit.Result r = createChange();
+
+    String testMessage = "hello from plugin";
+    TestOnPostReview testOnPostReview = new TestOnPostReview(testMessage);
+    try (Registration registration = extensionRegistry.newRegistration().add(testOnPostReview)) {
+      ReviewInput input = new ReviewInput().label("Code-Review", 1);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      Collection<ChangeMessageInfo> messages = gApi.changes().id(r.getChangeId()).get().messages;
+      assertThat(Iterables.getLast(messages).message)
+          .isEqualTo(String.format("Patch Set 1: Code-Review+1\n\n%s\n", testMessage));
+    }
+  }
+
+  @Test
+  public void extendChangeMessageFromMultiplePlugins() throws Exception {
+    PushOneCommit.Result r = createChange();
+
+    String testMessage1 = "hello from plugin 1";
+    String testMessage2 = "message from plugin 2";
+    TestOnPostReview testOnPostReview1 = new TestOnPostReview(testMessage1);
+    TestOnPostReview testOnPostReview2 = new TestOnPostReview(testMessage2);
+    try (Registration registration =
+        extensionRegistry.newRegistration().add(testOnPostReview1).add(testOnPostReview2)) {
+      ReviewInput input = new ReviewInput().label("Code-Review", 1);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      Collection<ChangeMessageInfo> messages = gApi.changes().id(r.getChangeId()).get().messages;
+      assertThat(Iterables.getLast(messages).message)
+          .isEqualTo(
+              String.format(
+                  "Patch Set 1: Code-Review+1\n\n%s\n\n%s\n", testMessage1, testMessage2));
+    }
+  }
+
+  @Test
+  public void onPostReviewExtensionThatDoesntExtendTheChangeMessage() throws Exception {
+    PushOneCommit.Result r = createChange();
+
+    TestOnPostReview testOnPostReview = new TestOnPostReview(/* message= */ null);
+    try (Registration registration = extensionRegistry.newRegistration().add(testOnPostReview)) {
+      ReviewInput input = new ReviewInput().label("Code-Review", 1);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      Collection<ChangeMessageInfo> messages = gApi.changes().id(r.getChangeId()).get().messages;
+      assertThat(Iterables.getLast(messages).message).isEqualTo("Patch Set 1: Code-Review+1");
+    }
+  }
+
+  @Test
+  public void onPostReviewCallbackGetsCorrectChangeAndPatchSet() throws Exception {
+    PushOneCommit.Result r = createChange();
+    amendChange(r.getChangeId());
+
+    TestOnPostReview testOnPostReview = new TestOnPostReview(/* message= */ null);
+    try (Registration registration = extensionRegistry.newRegistration().add(testOnPostReview)) {
+      ReviewInput input = new ReviewInput().label("Code-Review", 1);
+
+      // Vote on current patch set.
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertChangeAndPatchSet(r.getChange().getId(), 2);
+
+      // Vote on old patch set.
+      gApi.changes().id(r.getChangeId()).revision(1).review(input);
+      testOnPostReview.assertChangeAndPatchSet(r.getChange().getId(), 1);
+    }
+  }
+
+  @Test
+  public void onPostReviewCallbackGetsCorrectUser() throws Exception {
+    PushOneCommit.Result r = createChange();
+
+    TestOnPostReview testOnPostReview = new TestOnPostReview(/* message= */ null);
+    try (Registration registration = extensionRegistry.newRegistration().add(testOnPostReview)) {
+      ReviewInput input = new ReviewInput().label("Code-Review", 1);
+
+      // Vote from admin.
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertUser(admin);
+
+      // Vote from user.
+      requestScopeOperations.setApiUser(user.id());
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertUser(user);
+    }
+  }
+
+  @Test
+  public void onPostReviewCallbackGetsCorrectApprovals() throws Exception {
+    PushOneCommit.Result r = createChange();
+
+    TestOnPostReview testOnPostReview = new TestOnPostReview(/* message= */ null);
+    try (Registration registration = extensionRegistry.newRegistration().add(testOnPostReview)) {
+      // Add a new vote.
+      ReviewInput input = new ReviewInput().label("Code-Review", 1);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertApproval(
+          "Code-Review", /* expectedOldValue= */ 0, /* expectedNewValue= */ 1);
+
+      // Update an existing vote.
+      input = new ReviewInput().label("Code-Review", 2);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertApproval(
+          "Code-Review", /* expectedOldValue= */ 1, /* expectedNewValue= */ 2);
+
+      // Post without changing the vote.
+      input = new ReviewInput().label("Code-Review", 2);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertApproval(
+          "Code-Review", /* expectedOldValue= */ null, /* expectedNewValue= */ 2);
+
+      // Delete the vote.
+      input = new ReviewInput().label("Code-Review", 0);
+      gApi.changes().id(r.getChangeId()).current().review(input);
+      testOnPostReview.assertApproval(
+          "Code-Review", /* expectedOldValue= */ 2, /* expectedNewValue= */ 0);
+    }
+  }
+
   private List<RobotCommentInfo> getRobotComments(String changeId) throws RestApiException {
     return gApi.changes().id(changeId).robotComments().values().stream()
         .flatMap(Collection::stream)
@@ -495,4 +625,50 @@
         .comparingElementsUsing(COMMENT_CORRESPONDENCE)
         .containsExactly(commentsForValidation);
   }
+
+  private static class TestOnPostReview implements OnPostReview {
+    private final Optional<String> message;
+
+    private Change.Id changeId;
+    private PatchSet.Id patchSetId;
+    private Account.Id accountId;
+    private Map<String, Short> oldApprovals;
+    private Map<String, Short> approvals;
+
+    TestOnPostReview(@Nullable String message) {
+      this.message = Optional.ofNullable(message);
+    }
+
+    @Override
+    public Optional<String> getChangeMessageAddOn(
+        IdentifiedUser user,
+        ChangeNotes changeNotes,
+        PatchSet patchSet,
+        Map<String, Short> oldApprovals,
+        Map<String, Short> approvals) {
+      this.changeId = changeNotes.getChangeId();
+      this.patchSetId = patchSet.id();
+      this.accountId = user.getAccountId();
+      this.oldApprovals = oldApprovals;
+      this.approvals = approvals;
+      return message;
+    }
+
+    public void assertChangeAndPatchSet(Change.Id expectedChangeId, int expectedPatchSetNum) {
+      assertThat(changeId).isEqualTo(expectedChangeId);
+      assertThat(patchSetId.get()).isEqualTo(expectedPatchSetNum);
+    }
+
+    public void assertUser(TestAccount expectedUser) {
+      assertThat(accountId).isEqualTo(expectedUser.id());
+    }
+
+    public void assertApproval(
+        String labelName, @Nullable Integer expectedOldValue, int expectedNewValue) {
+      assertThat(oldApprovals)
+          .containsExactly(
+              labelName, expectedOldValue != null ? expectedOldValue.shortValue() : null);
+      assertThat(approvals).containsExactly(labelName, (short) expectedNewValue);
+    }
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/api/change/QueryChangesIT.java b/javatests/com/google/gerrit/acceptance/api/change/QueryChangesIT.java
index 33ec556..14704ad 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/QueryChangesIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/QueryChangesIT.java
@@ -25,21 +25,27 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.NoHttpd;
+import com.google.gerrit.acceptance.PushOneCommit;
 import com.google.gerrit.acceptance.UseClockStep;
 import com.google.gerrit.acceptance.config.GerritConfig;
 import com.google.gerrit.acceptance.testsuite.account.AccountOperations;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
+import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
+import com.google.gerrit.entities.AccessSection;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.Patch;
 import com.google.gerrit.entities.Permission;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.extensions.api.changes.ReviewInput;
 import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.TopLevelResource;
+import com.google.gerrit.server.project.ProjectConfig;
 import com.google.gerrit.server.restapi.change.QueryChanges;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
+import java.util.Arrays;
 import java.util.List;
 import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
 import org.eclipse.jgit.junit.TestRepository;
@@ -50,6 +56,7 @@
   @Inject private AccountOperations accountOperations;
   @Inject private ProjectOperations projectOperations;
   @Inject private Provider<QueryChanges> queryChangesProvider;
+  @Inject private RequestScopeOperations requestScopeOperations;
 
   @Test
   @SuppressWarnings("unchecked")
@@ -283,9 +290,91 @@
     assertThat(result.get(1).get(0)._number).isEqualTo(numericId2);
   }
 
+  @Test
+  public void skipVisibility_rejectedForNonAdmin() throws Exception {
+    requestScopeOperations.setApiUser(user.id());
+    final QueryChanges queryChanges = queryChangesProvider.get();
+    String query = "is:open repo:" + project.get();
+    queryChanges.addQuery(query);
+    AuthException thrown =
+        assertThrows(AuthException.class, () -> queryChanges.skipVisibility(true));
+    assertThat(thrown).hasMessageThat().isEqualTo("administrate server not permitted");
+  }
+
+  @Test
+  @SuppressWarnings("unchecked")
+  public void skipVisibility_noReadPermission() throws Exception {
+    createChange().getChangeId();
+    requestScopeOperations.setApiUser(admin.id());
+    QueryChanges queryChanges = queryChangesProvider.get();
+
+    queryChanges.addQuery("is:open repo:" + project.get());
+    List<List<ChangeInfo>> result =
+        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE).value();
+    assertThat(result).hasSize(1);
+
+    try (ProjectConfigUpdate u = updateProject(allProjects)) {
+      ProjectConfig cfg = u.getConfig();
+      removeAllBranchPermissions(cfg, Permission.READ);
+      u.save();
+    }
+
+    queryChanges = queryChangesProvider.get();
+    queryChanges.addQuery("is:open repo:" + project.get());
+    List<List<ChangeInfo>> result2 =
+        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE).value();
+    assertThat(result2).hasSize(0);
+
+    queryChanges = queryChangesProvider.get();
+    queryChanges.addQuery("is:open repo:" + project.get());
+    queryChanges.skipVisibility(true);
+    List<List<ChangeInfo>> result3 =
+        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE).value();
+    assertThat(result3).hasSize(1);
+  }
+
+  @Test
+  @SuppressWarnings("unchecked")
+  public void skipVisibility_privateChange() throws Exception {
+    TestRepository<InMemoryRepository> userRepo = cloneProject(project, user);
+    PushOneCommit.Result result =
+        pushFactory.create(user.newIdent(), userRepo).to("refs/for/master");
+    requestScopeOperations.setApiUser(user.id());
+    gApi.changes().id(result.getChangeId()).setPrivate(true);
+
+    requestScopeOperations.setApiUser(admin.id());
+    QueryChanges queryChanges = queryChangesProvider.get();
+
+    queryChanges.addQuery("is:open repo:" + project.get());
+    List<List<ChangeInfo>> result2 =
+        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE).value();
+    assertThat(result2).hasSize(0);
+
+    queryChanges = queryChangesProvider.get();
+    queryChanges.addQuery("is:open repo:" + project.get());
+    queryChanges.skipVisibility(true);
+    List<List<ChangeInfo>> result3 =
+        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE).value();
+    assertThat(result3).hasSize(1);
+  }
+
   private static void assertNoChangeHasMoreChangesSet(List<ChangeInfo> results) {
     for (ChangeInfo info : results) {
       assertThat(info._moreChanges).isNull();
     }
   }
+
+  private static void removeAllBranchPermissions(ProjectConfig cfg, String... permissions) {
+    for (AccessSection s : ImmutableList.copyOf(cfg.getAccessSections())) {
+      if (s.getName().startsWith("refs/heads/")
+          || s.getName().startsWith("refs/for/")
+          || s.getName().equals("refs/*")) {
+        cfg.upsertAccessSection(
+            s.getName(),
+            updatedSection -> {
+              Arrays.stream(permissions).forEach(p -> updatedSection.remove(Permission.builder(p)));
+            });
+      }
+    }
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/api/change/RevertIT.java b/javatests/com/google/gerrit/acceptance/api/change/RevertIT.java
index a3a089f..6cf3f3e 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/RevertIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/RevertIT.java
@@ -290,8 +290,28 @@
     gApi.changes().id(result.getChangeId()).revision(result.getCommit().name()).submit();
     RevertInput revertInput = new RevertInput();
     revertInput.message = "Message from input";
-    assertThat(gApi.changes().id(result.getChangeId()).revert(revertInput).get().subject)
-        .isEqualTo(revertInput.message);
+    ChangeInfo revertChange = gApi.changes().id(result.getChangeId()).revert(revertInput).get();
+    assertThat(revertChange.subject).isEqualTo(revertInput.message);
+    assertThat(gApi.changes().id(revertChange.id).current().commit(false).message)
+        .isEqualTo(String.format("Message from input\n\nChange-Id: %s\n", revertChange.changeId));
+  }
+
+  @Test
+  public void revertWithSetMessageChangeIdIgnored() throws Exception {
+    PushOneCommit.Result result = createChange();
+    gApi.changes().id(result.getChangeId()).current().review(ReviewInput.approve());
+    gApi.changes().id(result.getChangeId()).revision(result.getCommit().name()).submit();
+    RevertInput revertInput = new RevertInput();
+    String fakeChangeId = "Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef";
+    String commitSubject = "Message from input";
+    revertInput.message = String.format("%s\n\nChange-Id: %s\n", commitSubject, fakeChangeId);
+    ChangeInfo revertChange = gApi.changes().id(result.getChangeId()).revert(revertInput).get();
+    // ChangeId provided in revert input is ignored.
+    assertThat(revertChange.changeId).isNotEqualTo(fakeChangeId);
+    assertThat(revertChange.subject).isEqualTo(commitSubject);
+    // ChangeId footer was replaced in revert commit message.
+    assertThat(gApi.changes().id(revertChange.id).current().commit(false).message)
+        .isEqualTo(String.format("Message from input\n\nChange-Id: %s\n", revertChange.changeId));
   }
 
   @Test
@@ -825,6 +845,38 @@
   }
 
   @Test
+  public void revertSubmissionWithSetMessageChangeIdIgnored() throws Exception {
+    String firstResult = createChange("first change", "a.txt", "message").getChangeId();
+    String secondResult = createChange("second change", "b.txt", "message").getChangeId();
+    approve(firstResult);
+    approve(secondResult);
+    gApi.changes().id(secondResult).current().submit();
+    RevertInput revertInput = new RevertInput();
+    String fakeChangeId = "Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef";
+    String commitSubject = "Message from input";
+    String revertMessage = String.format("%s\n\nChange-Id: %s\n", commitSubject, fakeChangeId);
+    revertInput.message = revertMessage;
+    List<ChangeInfo> revertChanges =
+        gApi.changes().id(firstResult).revertSubmission(revertInput).revertChanges;
+    assertThat(revertChanges.get(0).subject).isEqualTo("Revert \"first change\"");
+    // ChangeId provided in revert input is ignored.
+    assertThat(revertChanges.get(0).changeId).isNotEqualTo(fakeChangeId);
+    assertThat(revertChanges.get(1).changeId).isNotEqualTo(fakeChangeId);
+    // ChangeId footer was replaced in revert commit message.
+    assertThat(gApi.changes().id(revertChanges.get(0).id).current().commit(false).message)
+        .isEqualTo(
+            String.format(
+                "Revert \"first change\"\n\n%s\n\nChange-Id: %s\n",
+                commitSubject, revertChanges.get(0).changeId));
+    assertThat(revertChanges.get(1).subject).isEqualTo("Revert \"second change\"");
+    assertThat(gApi.changes().id(revertChanges.get(1).id).current().commit(false).message)
+        .isEqualTo(
+            String.format(
+                "Revert \"second change\"\n\n%s\n\nChange-Id: %s\n",
+                commitSubject, revertChanges.get(1).changeId));
+  }
+
+  @Test
   public void revertSubmissionWithoutMessage() throws Exception {
     String firstResult = createChange("first change", "a.txt", "message").getChangeId();
     String secondResult = createChange("second change", "b.txt", "message").getChangeId();
diff --git a/javatests/com/google/gerrit/acceptance/api/project/CheckAccessIT.java b/javatests/com/google/gerrit/acceptance/api/project/CheckAccessIT.java
index 59493be..709facc 100644
--- a/javatests/com/google/gerrit/acceptance/api/project/CheckAccessIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/project/CheckAccessIT.java
@@ -222,6 +222,7 @@
   public void accessible() throws Exception {
     List<TestCase> inputs =
         ImmutableList.of(
+            // Test 1
             TestCase.projectRefPerm(
                 user.email(),
                 normalProject.get(),
@@ -231,10 +232,11 @@
                 ImmutableList.of(
                     "'user' can perform 'read' with force=false on project '"
                         + normalProject.get()
-                        + "' for ref 'refs/*'",
+                        + "' for ref 'refs/heads/*'",
                     "'user' cannot perform 'viewPrivateChanges' with force=false on project '"
                         + normalProject.get()
                         + "' for ref 'refs/heads/master'")),
+            // Test 2
             TestCase.project(
                 user.email(),
                 normalProject.get(),
@@ -242,7 +244,8 @@
                 ImmutableList.of(
                     "'user' can perform 'read' with force=false on project '"
                         + normalProject.get()
-                        + "' for ref 'refs/*'")),
+                        + "' for ref 'refs/heads/*'")),
+            // Test 3
             TestCase.project(
                 user.email(),
                 secretProject.get(),
@@ -250,7 +253,11 @@
                 ImmutableList.of(
                     "'user' cannot perform 'read' with force=false on project '"
                         + secretProject.get()
-                        + "' for ref 'refs/*' because this permission is blocked")),
+                        + "' for ref 'refs/heads/*' because this permission is blocked",
+                    "'user' cannot perform 'read' with force=false on project '"
+                        + secretProject.get()
+                        + "' for ref 'refs/meta/version' because this permission is blocked")),
+            // Test 4
             TestCase.projectRef(
                 user.email(),
                 secretRefProject.get(),
@@ -263,6 +270,7 @@
                     "'user' cannot perform 'read' with force=false on project '"
                         + secretRefProject.get()
                         + "' for ref 'refs/heads/secret/master' because this permission is blocked")),
+            // Test 5
             TestCase.projectRef(
                 privilegedUser.email(),
                 secretRefProject.get(),
@@ -275,6 +283,7 @@
                     "'privilegedUser' can perform 'read' with force=false on project '"
                         + secretRefProject.get()
                         + "' for ref 'refs/heads/secret/master'")),
+            // Test 6
             TestCase.projectRef(
                 privilegedUser.email(),
                 normalProject.get(),
@@ -283,7 +292,8 @@
                 ImmutableList.of(
                     "'privilegedUser' can perform 'read' with force=false on project '"
                         + normalProject.get()
-                        + "' for ref 'refs/*'")),
+                        + "' for ref 'refs/heads/*'")),
+            // Test 7
             TestCase.projectRef(
                 privilegedUser.email(),
                 secretProject.get(),
@@ -293,6 +303,7 @@
                     "'privilegedUser' can perform 'read' with force=false on project '"
                         + secretProject.get()
                         + "' for ref 'refs/*'")),
+            // Test 8
             TestCase.projectRefPerm(
                 privilegedUser.email(),
                 normalProject.get(),
@@ -302,10 +313,11 @@
                 ImmutableList.of(
                     "'privilegedUser' can perform 'read' with force=false on project '"
                         + normalProject.get()
-                        + "' for ref 'refs/*'",
+                        + "' for ref 'refs/heads/*'",
                     "'privilegedUser' can perform 'viewPrivateChanges' with force=false on project '"
                         + normalProject.get()
                         + "' for ref 'refs/heads/master'")),
+            // Test 9
             TestCase.projectRefPerm(
                 privilegedUser.email(),
                 normalProject.get(),
@@ -315,7 +327,7 @@
                 ImmutableList.of(
                     "'privilegedUser' can perform 'read' with force=false on project '"
                         + normalProject.get()
-                        + "' for ref 'refs/*'",
+                        + "' for ref 'refs/heads/*'",
                     "'privilegedUser' can perform 'forgeServerAsCommitter' with force=false on project '"
                         + normalProject.get()
                         + "' for ref 'refs/heads/master'")));
diff --git a/javatests/com/google/gerrit/acceptance/api/project/CommitIT.java b/javatests/com/google/gerrit/acceptance/api/project/CommitIT.java
index 80e04c0..bdb03d2 100644
--- a/javatests/com/google/gerrit/acceptance/api/project/CommitIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/project/CommitIT.java
@@ -16,11 +16,13 @@
 
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 import static java.util.stream.Collectors.toList;
 import static org.eclipse.jgit.lib.Constants.R_TAGS;
 
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.NoHttpd;
+import com.google.gerrit.acceptance.PushOneCommit;
 import com.google.gerrit.acceptance.PushOneCommit.Result;
 import com.google.gerrit.acceptance.TestAccount;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
@@ -36,6 +38,7 @@
 import com.google.gerrit.extensions.common.CommitInfo;
 import com.google.gerrit.extensions.common.GitPerson;
 import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.inject.Inject;
 import java.util.Iterator;
 import java.util.List;
@@ -96,77 +99,272 @@
   }
 
   @Test
-  public void cherryPickWithoutMessage() throws Exception {
-    String branch = "foo";
+  public void cherryPickWithoutMessageSameBranch() throws Exception {
+    String destBranch = "master";
 
     // Create change to cherry-pick
-    RevCommit revCommit = createChange().getCommit();
-
-    // Create target branch to cherry-pick to.
-    gApi.projects().name(project.get()).branch(branch).create(new BranchInput());
+    PushOneCommit.Result r = createChange();
+    ChangeInfo changeToCherryPick = info(r.getChangeId());
+    RevCommit commitToCherryPick = r.getCommit();
 
     // Cherry-pick without message.
     CherryPickInput input = new CherryPickInput();
-    input.destination = branch;
-    String changeId =
-        gApi.projects().name(project.get()).commit(revCommit.name()).cherryPick(input).get().id;
+    input.destination = destBranch;
+    ChangeInfo cherryPickResult =
+        gApi.projects()
+            .name(project.get())
+            .commit(commitToCherryPick.name())
+            .cherryPick(input)
+            .get();
 
+    // Expect that the Change-Id of the cherry-picked commit was used for the cherry-pick change.
+    // New patch-set to existing change was uploaded.
+    assertThat(cherryPickResult._number).isEqualTo(changeToCherryPick._number);
+    assertThat(cherryPickResult.revisions).hasSize(2);
+    assertThat(cherryPickResult.changeId).isEqualTo(changeToCherryPick.changeId);
+    assertThat(cherryPickResult.messages).hasSize(2);
+
+    // Cherry-pick of is not set, because the source change was not provided.
+    assertThat(cherryPickResult.cherryPickOfChange).isNull();
+    assertThat(cherryPickResult.cherryPickOfPatchSet).isNull();
     // Expect that the message of the cherry-picked commit was used for the cherry-pick change.
-    ChangeInfo changeInfo = gApi.changes().id(changeId).get();
-    RevisionInfo revInfo = changeInfo.revisions.get(changeInfo.currentRevision);
+    RevisionInfo revInfo = cherryPickResult.revisions.get(cherryPickResult.currentRevision);
     assertThat(revInfo).isNotNull();
-    assertThat(revInfo.commit.message).isEqualTo(revCommit.getFullMessage());
+    assertThat(revInfo.commit.message).isEqualTo(commitToCherryPick.getFullMessage());
   }
 
   @Test
-  public void cherryPickCommitWithoutChangeId() throws Exception {
+  public void cherryPickWithoutMessageOtherBranch() throws Exception {
+    String destBranch = "foo";
+    createBranch(BranchNameKey.create(project, destBranch));
+
+    // Create change to cherry-pick
+    PushOneCommit.Result r = createChange();
+    ChangeInfo changeToCherryPick = info(r.getChangeId());
+    RevCommit commitToCherryPick = r.getCommit();
+
+    // Cherry-pick without message.
     CherryPickInput input = new CherryPickInput();
-    input.destination = "foo";
+    input.destination = destBranch;
+    ChangeInfo cherryPickResult =
+        gApi.projects()
+            .name(project.get())
+            .commit(commitToCherryPick.name())
+            .cherryPick(input)
+            .get();
+
+    // Expect that the Change-Id of the cherry-picked commit was used for the cherry-pick change.
+    // New change in destination branch was created.
+    assertThat(cherryPickResult._number).isGreaterThan(changeToCherryPick._number);
+    assertThat(cherryPickResult.revisions).hasSize(1);
+    assertThat(cherryPickResult.changeId).isEqualTo(changeToCherryPick.changeId);
+    assertThat(cherryPickResult.messages).hasSize(1);
+
+    // Cherry-pick of is not set, because the source change was not provided.
+    assertThat(cherryPickResult.cherryPickOfChange).isNull();
+    assertThat(cherryPickResult.cherryPickOfPatchSet).isNull();
+    // Expect that the message of the cherry-picked commit was used for the cherry-pick change.
+    RevisionInfo revInfo = cherryPickResult.revisions.get(cherryPickResult.currentRevision);
+    assertThat(revInfo).isNotNull();
+    assertThat(revInfo.commit.message).isEqualTo(commitToCherryPick.getFullMessage());
+  }
+
+  @Test
+  public void cherryPickCommitWithoutChangeIdCreateNewChange() throws Exception {
+    String destBranch = "foo";
+    createBranch(BranchNameKey.create(project, destBranch));
+
+    CherryPickInput input = new CherryPickInput();
+    input.destination = destBranch;
     input.message = "it goes to foo branch";
-    gApi.projects().name(project.get()).branch(input.destination).create(new BranchInput());
 
-    RevCommit revCommit = createNewCommitWithoutChangeId("refs/heads/master", "a.txt", "content");
-    ChangeInfo changeInfo =
-        gApi.projects().name(project.get()).commit(revCommit.getName()).cherryPick(input).get();
+    RevCommit commitToCherryPick =
+        createNewCommitWithoutChangeId("refs/heads/master", "a.txt", "content");
+    ChangeInfo cherryPickResult =
+        gApi.projects()
+            .name(project.get())
+            .commit(commitToCherryPick.getName())
+            .cherryPick(input)
+            .get();
 
-    assertThat(changeInfo.messages).hasSize(1);
-    Iterator<ChangeMessageInfo> messageIterator = changeInfo.messages.iterator();
+    assertThat(cherryPickResult.messages).hasSize(1);
+    Iterator<ChangeMessageInfo> messageIterator = cherryPickResult.messages.iterator();
     String expectedMessage =
-        String.format("Patch Set 1: Cherry Picked from commit %s.", revCommit.getName());
+        String.format("Patch Set 1: Cherry Picked from commit %s.", commitToCherryPick.getName());
     assertThat(messageIterator.next().message).isEqualTo(expectedMessage);
 
-    RevisionInfo revInfo = changeInfo.revisions.get(changeInfo.currentRevision);
+    RevisionInfo revInfo = cherryPickResult.revisions.get(cherryPickResult.currentRevision);
     assertThat(revInfo).isNotNull();
     CommitInfo commitInfo = revInfo.commit;
     assertThat(commitInfo.message)
-        .isEqualTo(input.message + "\n\nChange-Id: " + changeInfo.changeId + "\n");
+        .isEqualTo(input.message + "\n\nChange-Id: " + cherryPickResult.changeId + "\n");
   }
 
   @Test
-  public void cherryPickCommitWithChangeId() throws Exception {
-    CherryPickInput input = new CherryPickInput();
-    input.destination = "foo";
+  public void cherryPickCommitWithChangeIdCreateNewChange() throws Exception {
+    String destBranch = "foo";
+    createBranch(BranchNameKey.create(project, destBranch));
 
-    RevCommit revCommit = createChange().getCommit();
-    List<String> footers = revCommit.getFooterLines("Change-Id");
+    PushOneCommit.Result r = createChange();
+    ChangeInfo changeToCherryPick = info(r.getChangeId());
+    RevCommit commitToCherryPick = r.getCommit();
+    List<String> footers = commitToCherryPick.getFooterLines("Change-Id");
     assertThat(footers).hasSize(1);
     String changeId = footers.get(0);
 
-    input.message = "it goes to foo branch\n\nChange-Id: " + changeId;
-    gApi.projects().name(project.get()).branch(input.destination).create(new BranchInput());
+    CherryPickInput input = new CherryPickInput();
+    input.destination = destBranch;
+    input.message =
+        String.format(
+            "it goes to foo branch\n\nChange-Id: Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef\n\nChange-Id: %s\n",
+            changeId);
 
-    ChangeInfo changeInfo =
-        gApi.projects().name(project.get()).commit(revCommit.getName()).cherryPick(input).get();
+    ChangeInfo cherryPickResult =
+        gApi.projects()
+            .name(project.get())
+            .commit(commitToCherryPick.getName())
+            .cherryPick(input)
+            .get();
 
-    assertThat(changeInfo.messages).hasSize(1);
-    Iterator<ChangeMessageInfo> messageIterator = changeInfo.messages.iterator();
+    // No change was found in destination branch with the provided Change-Id.
+    assertThat(cherryPickResult._number).isGreaterThan(changeToCherryPick._number);
+    assertThat(cherryPickResult.changeId).isEqualTo(changeId);
+    assertThat(cherryPickResult.revisions).hasSize(1);
+    assertThat(cherryPickResult.messages).hasSize(1);
+    Iterator<ChangeMessageInfo> messageIterator = cherryPickResult.messages.iterator();
     String expectedMessage =
-        String.format("Patch Set 1: Cherry Picked from commit %s.", revCommit.getName());
+        String.format("Patch Set 1: Cherry Picked from commit %s.", commitToCherryPick.getName());
     assertThat(messageIterator.next().message).isEqualTo(expectedMessage);
 
-    RevisionInfo revInfo = changeInfo.revisions.get(changeInfo.currentRevision);
+    // Cherry-pick of is not set, because the source change was not provided.
+    assertThat(cherryPickResult.cherryPickOfChange).isNull();
+    assertThat(cherryPickResult.cherryPickOfPatchSet).isNull();
+    RevisionInfo revInfo = cherryPickResult.revisions.get(cherryPickResult.currentRevision);
     assertThat(revInfo).isNotNull();
-    assertThat(revInfo.commit.message).isEqualTo(input.message + "\n");
+    assertThat(revInfo.commit.message).isEqualTo(input.message);
+  }
+
+  @Test
+  public void cherryPickCommitToExistingChange() throws Exception {
+    String destBranch = "foo";
+    createBranch(BranchNameKey.create(project, destBranch));
+
+    PushOneCommit.Result r = createChange("refs/for/" + destBranch);
+    ChangeInfo existingDestChange = info(r.getChangeId());
+
+    String commitToCherryPick = createChange().getCommit().getName();
+
+    CherryPickInput input = new CherryPickInput();
+    input.destination = destBranch;
+    input.message =
+        String.format(
+            "it goes to foo branch\n\nChange-Id: Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef\n\nChange-Id: %s\n",
+            existingDestChange.changeId);
+    input.allowConflicts = true;
+    input.allowEmpty = true;
+
+    ChangeInfo cherryPickResult =
+        gApi.projects().name(project.get()).commit(commitToCherryPick).cherryPick(input).get();
+
+    // New patch-set to existing change was uploaded.
+    assertThat(cherryPickResult._number).isEqualTo(existingDestChange._number);
+    assertThat(cherryPickResult.changeId).isEqualTo(existingDestChange.changeId);
+    assertThat(cherryPickResult.messages).hasSize(2);
+    assertThat(cherryPickResult.revisions).hasSize(2);
+    Iterator<ChangeMessageInfo> messageIterator = cherryPickResult.messages.iterator();
+
+    assertThat(messageIterator.next().message).isEqualTo("Uploaded patch set 1.");
+    assertThat(messageIterator.next().message).isEqualTo("Uploaded patch set 2.");
+    // Cherry-pick of is not set, because the source change was not provided.
+    assertThat(cherryPickResult.cherryPickOfChange).isNull();
+    assertThat(cherryPickResult.cherryPickOfPatchSet).isNull();
+    RevisionInfo revInfo = cherryPickResult.revisions.get(cherryPickResult.currentRevision);
+    assertThat(revInfo).isNotNull();
+    assertThat(revInfo.commit.message).isEqualTo(input.message);
+  }
+
+  @Test
+  public void cherryPickCommitToExistingCherryPickedChange() throws Exception {
+    String destBranch = "foo";
+    createBranch(BranchNameKey.create(project, destBranch));
+
+    PushOneCommit.Result r = createChange("refs/for/" + destBranch);
+    ChangeInfo existingDestChange = info(r.getChangeId());
+
+    r = createChange();
+    ChangeInfo changeToCherryPick = info(r.getChangeId());
+    RevCommit commitToCherryPick = r.getCommit();
+
+    CherryPickInput input = new CherryPickInput();
+    input.destination = destBranch;
+    input.message =
+        String.format("it goes to foo branch\n\nChange-Id: %s\n", existingDestChange.changeId);
+    input.allowConflicts = true;
+    input.allowEmpty = true;
+    // Use RevisionAPI to submit initial cherryPick.
+    ChangeInfo cherryPickResult =
+        gApi.changes().id(changeToCherryPick.changeId).current().cherryPick(input).get();
+    assertThat(cherryPickResult.changeId).isEqualTo(existingDestChange.changeId);
+    // Cherry-pick was set.
+    assertThat(cherryPickResult.cherryPickOfChange).isEqualTo(changeToCherryPick._number);
+    assertThat(cherryPickResult.cherryPickOfPatchSet).isEqualTo(1);
+    RevisionInfo revInfo = cherryPickResult.revisions.get(cherryPickResult.currentRevision);
+    assertThat(revInfo).isNotNull();
+    assertThat(revInfo.commit.message).isEqualTo(input.message);
+    // Use CommitApi to update the cherryPick change.
+    cherryPickResult =
+        gApi.projects()
+            .name(project.get())
+            .commit(commitToCherryPick.getName())
+            .cherryPick(input)
+            .get();
+
+    assertThat(cherryPickResult.changeId).isEqualTo(existingDestChange.changeId);
+    assertThat(cherryPickResult.messages).hasSize(3);
+    Iterator<ChangeMessageInfo> messageIterator = cherryPickResult.messages.iterator();
+
+    assertThat(messageIterator.next().message).isEqualTo("Uploaded patch set 1.");
+    assertThat(messageIterator.next().message).isEqualTo("Uploaded patch set 2.");
+    assertThat(messageIterator.next().message).isEqualTo("Uploaded patch set 3.");
+    // Cherry-pick was reset to empty value.
+    assertThat(cherryPickResult._number).isEqualTo(existingDestChange._number);
+    assertThat(cherryPickResult.cherryPickOfChange).isNull();
+    assertThat(cherryPickResult.cherryPickOfPatchSet).isNull();
+  }
+
+  @Test
+  public void cherryPickCommitWithChangeIdToClosedChange() throws Exception {
+    String destBranch = "refs/heads/foo";
+    createBranch(BranchNameKey.create(project, destBranch));
+
+    PushOneCommit.Result r = createChange("refs/for/" + destBranch);
+    ChangeInfo existingDestChange = info(r.getChangeId());
+    String commitToCherryPick = createChange().getCommit().getName();
+
+    gApi.changes().id(existingDestChange.changeId).current().review(ReviewInput.approve());
+    gApi.changes().id(existingDestChange.changeId).current().submit();
+
+    CherryPickInput input = new CherryPickInput();
+    input.destination = destBranch;
+    input.message =
+        String.format("it goes to foo branch\n\nChange-Id: %s\n", existingDestChange.changeId);
+    input.allowConflicts = true;
+    input.allowEmpty = true;
+
+    BadRequestException thrown =
+        assertThrows(
+            BadRequestException.class,
+            () -> gApi.projects().name(project.get()).commit(commitToCherryPick).cherryPick(input));
+    assertThat(thrown)
+        .hasMessageThat()
+        .isEqualTo(
+            String.format(
+                "Cherry-pick with Change-Id %s could not update the existing change %d in "
+                    + "destination branch %s of project %s, because the change was closed (MERGED)",
+                existingDestChange.changeId,
+                existingDestChange._number,
+                destBranch,
+                project.get()));
   }
 
   @Test
diff --git a/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java b/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
index 7662a54..8e31e904 100644
--- a/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/revision/RevisionIT.java
@@ -386,8 +386,11 @@
 
     // The cherry-pick honors the ChangeId specified in the input message:
     RevisionInfo revInfo = changeInfo.revisions.get(changeInfo.currentRevision);
+    // New change was created.
+    assertThat(changeInfo._number).isGreaterThan(orig.get()._number);
+    assertThat(changeInfo.changeId).isEqualTo(id);
     assertThat(revInfo).isNotNull();
-    assertThat(revInfo.commit.message).endsWith(id + "\n");
+    assertThat(revInfo.commit.message.trim()).endsWith(id);
   }
 
   @Test
@@ -477,6 +480,9 @@
     assertThat(cherryInfo.messages).hasSize(2);
     Iterator<ChangeMessageInfo> cherryIt = cherryInfo.messages.iterator();
     assertThat(cherryInfo.cherryPickOfChange).isEqualTo(change.get()._number);
+
+    // Existing change was updated.
+    assertThat(cherryInfo._number).isEqualTo(change.get()._number);
     assertThat(cherryInfo.cherryPickOfPatchSet).isEqualTo(1);
     assertThat(cherryIt.next().message).isEqualTo("Uploaded patch set 1.");
     assertThat(cherryIt.next().message).isEqualTo("Uploaded patch set 2.");
@@ -708,12 +714,13 @@
     in.destination = "foo";
     in.message = r3.getCommit().getFullMessage();
     cherry = gApi.changes().id(t1).current().cherryPick(in);
+    assertThat(cherry.get()._number).isEqualTo(info(t2)._number);
     assertThat(cherry.get().cherryPickOfChange).isEqualTo(orig.get()._number);
     assertThat(cherry.get().cherryPickOfPatchSet).isEqualTo(2);
   }
 
   @Test
-  public void cherryPickToExistingChange() throws Exception {
+  public void cherryPickToAbandonedChange() throws Exception {
     PushOneCommit.Result r1 =
         pushFactory
             .create(admin.newIdent(), testRepo, SUBJECT, FILE_NAME, "a")
@@ -734,15 +741,17 @@
     CherryPickInput in = new CherryPickInput();
     in.destination = "foo";
     in.message = r1.getCommit().getFullMessage();
-    ResourceConflictException thrown =
+    BadRequestException thrown =
         assertThrows(
-            ResourceConflictException.class, () -> gApi.changes().id(t1).current().cherryPick(in));
+            BadRequestException.class, () -> gApi.changes().id(t1).current().cherryPick(in));
     assertThat(thrown)
         .hasMessageThat()
         .isEqualTo(
-            "Cannot create new patch set of change "
-                + info(t2)._number
-                + " because it is abandoned");
+            String.format(
+                "Cherry-pick with Change-Id %s could not update the existing change %d in "
+                    + "destination branch refs/heads/foo of project %s, because "
+                    + "the change was closed (ABANDONED)",
+                r1.getChangeId(), info(t2)._number, project.get()));
 
     gApi.changes().id(t2).restore();
     gApi.changes().id(t1).current().cherryPick(in);
@@ -751,6 +760,45 @@
   }
 
   @Test
+  public void cherryPickToExistingMergedChange() throws Exception {
+    PushOneCommit.Result r1 =
+        pushFactory
+            .create(admin.newIdent(), testRepo, SUBJECT, FILE_NAME, "a")
+            .to("refs/for/master");
+    String t1 = project.get() + "~master~" + r1.getChangeId();
+
+    BranchInput bin = new BranchInput();
+    bin.revision = r1.getCommit().getParent(0).name();
+    gApi.projects().name(project.get()).branch("foo").create(bin);
+
+    PushOneCommit.Result r2 =
+        pushFactory
+            .create(admin.newIdent(), testRepo, SUBJECT, FILE_NAME, "b", r1.getChangeId())
+            .to("refs/for/foo");
+    String t2 = project.get() + "~foo~" + r2.getChangeId();
+
+    gApi.changes().id(t2).current().review(ReviewInput.approve());
+    gApi.changes().id(t2).current().submit();
+
+    CherryPickInput in = new CherryPickInput();
+    in.destination = "foo";
+    in.message = r1.getCommit().getFullMessage();
+    in.allowConflicts = true;
+    in.allowEmpty = true;
+    BadRequestException thrown =
+        assertThrows(
+            BadRequestException.class, () -> gApi.changes().id(t2).current().cherryPick(in));
+    assertThat(thrown)
+        .hasMessageThat()
+        .isEqualTo(
+            String.format(
+                "Cherry-pick with Change-Id %s could not update the existing change %d in "
+                    + "destination branch refs/heads/foo of project %s, because "
+                    + "the change was closed (MERGED)",
+                r1.getChangeId(), info(t2)._number, project.get()));
+  }
+
+  @Test
   public void cherryPickMergeRelativeToDefaultParent() throws Exception {
     String parent1FileName = "a.txt";
     String parent2FileName = "b.txt";
@@ -1574,7 +1622,7 @@
         new PatchSetWebLink() {
           @Override
           public WebLinkInfo getPatchSetWebLink(
-              String projectName, String commit, String subject, String branchName) {
+              String projectName, String commit, String commitMessage, String branchName) {
             return expectedWebLinkInfo;
           }
         };
diff --git a/javatests/com/google/gerrit/acceptance/git/AbstractPushForReview.java b/javatests/com/google/gerrit/acceptance/git/AbstractPushForReview.java
index 763e7b1..a50bbcf 100644
--- a/javatests/com/google/gerrit/acceptance/git/AbstractPushForReview.java
+++ b/javatests/com/google/gerrit/acceptance/git/AbstractPushForReview.java
@@ -899,7 +899,19 @@
     GitUtil.fetch(user2Repo, r.getPatchSet().refName() + ":ps");
     user2Repo.reset("ps");
     r = amendChange(r.getChangeId(), "refs/for/master%ready", user2, user2Repo);
-    r.assertErrorStatus(ReceiveConstants.ONLY_CHANGE_OWNER_OR_PROJECT_OWNER_CAN_MODIFY_WIP);
+    r.assertErrorStatus(ReceiveConstants.ONLY_USERS_WITH_TOGGLE_WIP_STATE_PERM_CAN_MODIFY_WIP);
+
+    // Non owner, non admin and non project owner with toggleWipState should succeed.
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(
+            allow(Permission.TOGGLE_WORK_IN_PROGRESS_STATE)
+                .ref(RefNames.REFS_HEADS + "*")
+                .group(REGISTERED_USERS))
+        .update();
+    r = amendChange(r.getChangeId(), "refs/for/master%ready", user2, user2Repo);
+    r.assertOkStatus();
 
     // Project owner trying to move from WIP to ready should succeed.
     projectOperations
@@ -2732,6 +2744,14 @@
     assertPushOk(r, "refs/for/otherBranch");
   }
 
+  @Test
+  public void pushWithVoteDoesNotAddToAttentionSet() throws Exception {
+    String pushSpec = "refs/for/master%l=Code-Review+1";
+    PushOneCommit.Result r = pushTo(pushSpec);
+    r.assertOkStatus();
+    assertThat(r.getChange().attentionSet()).isEmpty();
+  }
+
   private DraftInput newDraft(String path, int line, String message) {
     DraftInput d = new DraftInput();
     d.path = path;
diff --git a/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java b/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
index 7b99a55..f23cc10 100644
--- a/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
+++ b/javatests/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
@@ -25,11 +25,6 @@
 public class ElasticReindexIT extends AbstractReindexTests {
 
   @ConfigSuite.Default
-  public static Config elasticsearchV6() {
-    return getConfig(ElasticVersion.V6_8);
-  }
-
-  @ConfigSuite.Config
   public static Config elasticsearchV7() {
     return getConfig(ElasticVersion.V7_8);
   }
diff --git a/javatests/com/google/gerrit/acceptance/rest/RestApiServletIT.java b/javatests/com/google/gerrit/acceptance/rest/RestApiServletIT.java
new file mode 100644
index 0000000..bc45460
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/rest/RestApiServletIT.java
@@ -0,0 +1,76 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.rest;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.apache.http.HttpStatus.SC_OK;
+
+import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.RestResponse;
+import com.google.gerrit.httpd.restapi.RestApiServlet;
+import java.io.IOException;
+import java.util.regex.Pattern;
+import org.apache.http.message.BasicHeader;
+import org.junit.Test;
+
+public class RestApiServletIT extends AbstractDaemonTest {
+  private static String ANY_REST_API = "/accounts/self/capabilities";
+  private static BasicHeader ACCEPT_STAR_HEADER = new BasicHeader("Accept", "*/*");
+  private static Pattern ANY_SPACE = Pattern.compile("\\s");
+
+  @Test
+  public void restResponseBodyShouldBeCompactWithoutSpaces() throws Exception {
+    RestResponse response = adminRestSession.getWithHeader(ANY_REST_API, ACCEPT_STAR_HEADER);
+    assertThat(response.getStatusCode()).isEqualTo(SC_OK);
+
+    assertThat(contentWithoutMagicJson(response)).doesNotContainMatch(ANY_SPACE);
+  }
+
+  @Test
+  public void restResponseBodyShouldBeCompactWithoutSpacesWhenPPIsZero() throws Exception {
+    assertThat(contentWithoutMagicJson(prettyJsonRestResponse("prettyPrint", 0)))
+        .doesNotContainMatch(ANY_SPACE);
+  }
+
+  @Test
+  public void restResponseBodyShouldBeCompactWithoutSpacesWhenPrerryPrintIsZero() throws Exception {
+    assertThat(contentWithoutMagicJson(prettyJsonRestResponse("pp", 0)))
+        .doesNotContainMatch(ANY_SPACE);
+  }
+
+  @Test
+  public void restResponseBodyShouldBePrettyfiedWhenPPIsOne() throws Exception {
+    assertThat(contentWithoutMagicJson(prettyJsonRestResponse("pp", 1))).containsMatch(ANY_SPACE);
+  }
+
+  @Test
+  public void restResponseBodyShouldBePrettyfiedWhenPrettyPrintIsOne() throws Exception {
+    assertThat(contentWithoutMagicJson(prettyJsonRestResponse("prettyPrint", 1)))
+        .containsMatch(ANY_SPACE);
+  }
+
+  private RestResponse prettyJsonRestResponse(String ppArgument, int ppValue) throws Exception {
+    RestResponse response =
+        adminRestSession.getWithHeader(
+            ANY_REST_API + "?" + ppArgument + "=" + ppValue, ACCEPT_STAR_HEADER);
+    assertThat(response.getStatusCode()).isEqualTo(SC_OK);
+
+    return response;
+  }
+
+  private String contentWithoutMagicJson(RestResponse response) throws IOException {
+    return response.getEntityContent().substring(RestApiServlet.JSON_MAGIC.length);
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/rest/TraceIT.java b/javatests/com/google/gerrit/acceptance/rest/TraceIT.java
index cb34bdb..7f8add8 100644
--- a/javatests/com/google/gerrit/acceptance/rest/TraceIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/TraceIT.java
@@ -18,6 +18,13 @@
 import static org.apache.http.HttpStatus.SC_CREATED;
 import static org.apache.http.HttpStatus.SC_INTERNAL_SERVER_ERROR;
 import static org.apache.http.HttpStatus.SC_OK;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.timeout;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
 
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableList;
@@ -52,7 +59,6 @@
 import com.google.gerrit.server.validators.ProjectCreationValidationListener;
 import com.google.gerrit.server.validators.ValidationException;
 import com.google.inject.Inject;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
@@ -370,37 +376,31 @@
 
   @Test
   public void performanceLoggingForRestCall() throws Exception {
-    TestPerformanceLogger testPerformanceLogger = new TestPerformanceLogger();
+    PerformanceLogger testPerformanceLogger = mock(PerformanceLogger.class);
     try (Registration registration =
         extensionRegistry.newRegistration().add(testPerformanceLogger)) {
       RestResponse response = adminRestSession.put("/projects/new10");
       assertThat(response.getStatusCode()).isEqualTo(SC_CREATED);
-
-      // This assertion assumes that the server invokes the PerformanceLogger plugins before it
-      // sends
-      // the response to the client. If this assertion gets flaky it's likely that this got changed
-      // on
-      // server-side.
-      assertThat(testPerformanceLogger.logEntries()).isNotEmpty();
+      verify(testPerformanceLogger, timeout(5000).atLeastOnce()).log(anyString(), anyLong(), any());
     }
   }
 
   @Test
   public void performanceLoggingForPush() throws Exception {
-    TestPerformanceLogger testPerformanceLogger = new TestPerformanceLogger();
+    PerformanceLogger testPerformanceLogger = mock(PerformanceLogger.class);
     try (Registration registration =
         extensionRegistry.newRegistration().add(testPerformanceLogger)) {
       PushOneCommit push = pushFactory.create(admin.newIdent(), testRepo);
       PushOneCommit.Result r = push.to("refs/heads/master");
       r.assertOkStatus();
-      assertThat(testPerformanceLogger.logEntries()).isNotEmpty();
+      verify(testPerformanceLogger, timeout(5000).atLeastOnce()).log(anyString(), anyLong(), any());
     }
   }
 
   @Test
   @GerritConfig(name = "tracing.performanceLogging", value = "false")
   public void noPerformanceLoggingIfDisabled() throws Exception {
-    TestPerformanceLogger testPerformanceLogger = new TestPerformanceLogger();
+    PerformanceLogger testPerformanceLogger = mock(PerformanceLogger.class);
     try (Registration registration =
         extensionRegistry.newRegistration().add(testPerformanceLogger)) {
       RestResponse response = adminRestSession.put("/projects/new11");
@@ -410,7 +410,7 @@
       PushOneCommit.Result r = push.to("refs/heads/master");
       r.assertOkStatus();
 
-      assertThat(testPerformanceLogger.logEntries()).isEmpty();
+      verifyZeroInteractions(testPerformanceLogger);
     }
   }
 
@@ -844,19 +844,6 @@
     }
   }
 
-  private static class TestPerformanceLogger implements PerformanceLogger {
-    private List<PerformanceLogEntry> logEntries = new ArrayList<>();
-
-    @Override
-    public void log(String operation, long durationMs, Metadata metadata) {
-      logEntries.add(PerformanceLogEntry.create(operation, metadata));
-    }
-
-    ImmutableList<PerformanceLogEntry> logEntries() {
-      return ImmutableList.copyOf(logEntries);
-    }
-  }
-
   @AutoValue
   abstract static class PerformanceLogEntry {
     static PerformanceLogEntry create(String operation, Metadata metadata) {
diff --git a/javatests/com/google/gerrit/acceptance/rest/binding/PluginProvidedRootRestApiBindingsIT.java b/javatests/com/google/gerrit/acceptance/rest/binding/PluginProvidedRootRestApiBindingsIT.java
index b447534..16dc294 100644
--- a/javatests/com/google/gerrit/acceptance/rest/binding/PluginProvidedRootRestApiBindingsIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/binding/PluginProvidedRootRestApiBindingsIT.java
@@ -16,6 +16,7 @@
 
 import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
 
+import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
@@ -48,6 +49,7 @@
 import javax.servlet.http.HttpServletRequestWrapper;
 import javax.servlet.http.HttpServletResponse;
 import org.junit.Test;
+import org.kohsuke.args4j.Option;
 
 /**
  * Tests for checking plugin-provided REST API bindings directly under {@code /}.
@@ -192,8 +194,15 @@
 
   @Singleton
   static class TestGet implements RestReadView<TestPluginResource> {
+
+    @Option(name = "--crash")
+    String crash;
+
     @Override
     public Response<String> apply(TestPluginResource resource) throws Exception {
+      if (!Strings.nullToEmpty(crash).isEmpty()) {
+        throw new IllegalStateException();
+      }
       return Response.ok("test");
     }
   }
@@ -204,4 +213,13 @@
       RestApiCallHelper.execute(adminRestSession, TEST_CALLS.asList());
     }
   }
+
+  @Test
+  public void testOptionOnSingletonIsIgnored() throws Exception {
+    try (AutoCloseable ignored = installPlugin(PLUGIN_NAME, null, MyPluginHttpModule.class, null)) {
+      RestApiCallHelper.execute(
+          adminRestSession,
+          RestCall.get("/plugins/" + PLUGIN_NAME + "/test-collection/1/detail?crash=xyz"));
+    }
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/rest/change/CreateChangeIT.java b/javatests/com/google/gerrit/acceptance/rest/change/CreateChangeIT.java
index 7fe2a50..a539bd5 100644
--- a/javatests/com/google/gerrit/acceptance/rest/change/CreateChangeIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/change/CreateChangeIT.java
@@ -15,7 +15,9 @@
 package com.google.gerrit.acceptance.rest.change;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
 import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.block;
+import static com.google.gerrit.entities.Permission.CREATE;
 import static com.google.gerrit.entities.Permission.READ;
 import static com.google.gerrit.entities.RefNames.changeMetaRef;
 import static com.google.gerrit.extensions.common.testing.GitPersonSubject.assertThat;
@@ -180,6 +182,87 @@
   }
 
   @Test
+  public void cannotCreateChangeOnGerritInternalRefs() throws Exception {
+    requestScopeOperations.setApiUser(admin.id());
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(CREATE).ref("refs/*").group(REGISTERED_USERS))
+        .update();
+
+    String disallowedRef = "refs/changes/00/1000"; // All Gerrit internal refs behave the same way
+    requestScopeOperations.setApiUser(admin.id());
+    BranchNameKey branchNameKey = BranchNameKey.create(project, disallowedRef);
+    createBranch(branchNameKey);
+
+    requestScopeOperations.setApiUser(user.id());
+    ChangeInput ci = newChangeInput(ChangeStatus.NEW);
+    ci.subject = "Subject";
+    ci.branch = disallowedRef;
+
+    Throwable thrown = assertThrows(RestApiException.class, () -> gApi.changes().create(ci));
+    assertThat(thrown).hasMessageThat().contains("Cannot create a change on ref " + ci.branch);
+  }
+
+  @Test
+  public void cannotCreateChangeOnTagRefs() throws Exception {
+    requestScopeOperations.setApiUser(admin.id());
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(CREATE).ref("refs/*").group(REGISTERED_USERS))
+        .update();
+
+    String branchName = "refs/tags/v1.0";
+    requestScopeOperations.setApiUser(admin.id());
+    BranchNameKey branchNameKey = BranchNameKey.create(project, branchName);
+    createBranch(branchNameKey);
+
+    requestScopeOperations.setApiUser(user.id());
+    ChangeInput ci = newChangeInput(ChangeStatus.NEW);
+    ci.subject = "Subject";
+    ci.branch = branchName;
+
+    Throwable thrown = assertThrows(RestApiException.class, () -> gApi.changes().create(ci));
+    assertThat(thrown).hasMessageThat().contains("Cannot create a change on ref " + ci.branch);
+  }
+
+  @Test
+  public void canCreateChangeOnRefsMetaConfig() throws Exception {
+    requestScopeOperations.setApiUser(admin.id());
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(CREATE).ref("refs/*").group(REGISTERED_USERS))
+        .add(allow(READ).ref("refs/meta/config").group(REGISTERED_USERS))
+        .update();
+    requestScopeOperations.setApiUser(user.id());
+    ChangeInput ci = newChangeInput(ChangeStatus.NEW);
+    ci.subject = "Subject";
+    ci.branch = RefNames.REFS_CONFIG;
+    assertThat(gApi.changes().create(ci).info().branch).isEqualTo(RefNames.REFS_CONFIG);
+  }
+
+  @Test
+  public void canCreateChangeOnRefsMetaDashboards() throws Exception {
+    String branchName = "refs/meta/dashboards/project_1";
+    requestScopeOperations.setApiUser(admin.id());
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(CREATE).ref(branchName).group(REGISTERED_USERS))
+        .add(allow(READ).ref(branchName).group(REGISTERED_USERS))
+        .update();
+    BranchNameKey branchNameKey = BranchNameKey.create(project, branchName);
+    createBranch(branchNameKey);
+    requestScopeOperations.setApiUser(user.id());
+    ChangeInput ci = newChangeInput(ChangeStatus.NEW);
+    ci.subject = "Subject";
+    ci.branch = branchName;
+    assertThat(gApi.changes().create(ci).info().branch).isEqualTo(branchName);
+  }
+
+  @Test
   public void cannotCreateChangeWithChangeIfOfExistingChangeOnSameBranch() throws Exception {
     String changeId = createChange().getChangeId();
 
@@ -708,6 +791,9 @@
     projectOperations
         .project(project)
         .forUpdate()
+        // Allow reading for refs/meta/config so that the project is visible to the user. Otherwise
+        // the request will fail with an UnprocessableEntityException "Project not found:".
+        .add(allow(READ).ref("refs/meta/config").group(REGISTERED_USERS))
         .add(block(READ).ref("refs/heads/*").group(REGISTERED_USERS))
         .update();
     requestScopeOperations.setApiUser(user.id());
@@ -731,6 +817,9 @@
     projectOperations
         .project(project)
         .forUpdate()
+        // Allow reading for refs/meta/config so that the project is visible to the user. Otherwise
+        // the request will fail with an UnprocessableEntityException "Project not found:".
+        .add(allow(READ).ref("refs/meta/config").group(REGISTERED_USERS))
         .add(block(READ).ref("refs/heads/*").group(REGISTERED_USERS))
         .update();
     requestScopeOperations.setApiUser(user.id());
diff --git a/javatests/com/google/gerrit/acceptance/rest/change/MoveChangeIT.java b/javatests/com/google/gerrit/acceptance/rest/change/MoveChangeIT.java
index d5881ea..19e36f2 100644
--- a/javatests/com/google/gerrit/acceptance/rest/change/MoveChangeIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/change/MoveChangeIT.java
@@ -16,15 +16,19 @@
 
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.gerrit.acceptance.GitUtil.pushHead;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
 import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allowLabel;
 import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.block;
 import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
+import static com.google.gerrit.server.project.testing.TestLabels.value;
 import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 
+import com.google.common.collect.ImmutableList;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.GitUtil;
 import com.google.gerrit.acceptance.NoHttpd;
 import com.google.gerrit.acceptance.PushOneCommit;
+import com.google.gerrit.acceptance.TestAccount;
 import com.google.gerrit.acceptance.config.GerritConfig;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
 import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
@@ -190,7 +194,7 @@
         .update();
     AuthException thrown =
         assertThrows(AuthException.class, () -> move(r.getChangeId(), newBranch.branch()));
-    assertThat(thrown).hasMessageThat().contains("move not permitted");
+    assertThat(thrown).hasMessageThat().isEqualTo("move not permitted");
   }
 
   @Test
@@ -210,7 +214,7 @@
     requestScopeOperations.setApiUser(user.id());
     AuthException thrown =
         assertThrows(AuthException.class, () -> move(r.getChangeId(), newBranch.branch()));
-    assertThat(thrown).hasMessageThat().contains("move not permitted");
+    assertThat(thrown).hasMessageThat().isEqualTo("move not permitted");
   }
 
   @Test
@@ -269,6 +273,224 @@
   }
 
   @Test
+  public void moveChangeKeepAllVotesOnlyAllowedForAdmins() throws Exception {
+    // Keep all votes options is only permitted for admins.
+    BranchNameKey destinationBranch = BranchNameKey.create(project, "dest");
+    createBranch(destinationBranch);
+    BranchNameKey sourceBranch = BranchNameKey.create(project, "source");
+    createBranch(sourceBranch);
+    String changeId = createChangeInBranch(sourceBranch.branch()).getChangeId();
+
+    // Grant change permissions to the registered users.
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(Permission.PUSH).ref(destinationBranch.branch()).group(REGISTERED_USERS))
+        .update();
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(Permission.ABANDON).ref(sourceBranch.branch()).group(REGISTERED_USERS))
+        .update();
+
+    requestScopeOperations.setApiUser(user.id());
+
+    AuthException thrown =
+        assertThrows(
+            AuthException.class, () -> move(changeId, destinationBranch.shortName(), true));
+    assertThat(thrown).hasMessageThat().isEqualTo("move is not permitted with keepAllVotes option");
+
+    requestScopeOperations.setApiUser(admin.id());
+
+    move(changeId, destinationBranch.branch(), true);
+    assertThat(info(changeId).branch).isEqualTo(destinationBranch.shortName());
+  }
+
+  @Test
+  public void moveChangeKeepAllVotesNoLabelInDestination() throws Exception {
+    BranchNameKey destinationBranch = BranchNameKey.create(project, "dest");
+    createBranch(destinationBranch);
+    BranchNameKey sourceBranch = BranchNameKey.create(project, "source");
+    createBranch(sourceBranch);
+
+    String testLabelA = "Label-A";
+    // The label has the range [-1; 1]
+    configLabel(testLabelA, LabelFunction.NO_BLOCK, ImmutableList.of(sourceBranch.branch()));
+    // Registered users have permissions for the entire range [-1; 1] on all branches.
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allowLabel(testLabelA).ref("refs/heads/*").group(REGISTERED_USERS).range(-1, +1))
+        .update();
+
+    String changeId = createChangeInBranch(sourceBranch.branch()).getChangeId();
+    requestScopeOperations.setApiUser(user.id());
+    ReviewInput userReviewInput = new ReviewInput();
+    userReviewInput.label(testLabelA, 1);
+    gApi.changes().id(changeId).current().review(userReviewInput);
+
+    assertLabelVote(user, changeId, testLabelA, (short) 1);
+
+    requestScopeOperations.setApiUser(admin.id());
+    assertThat(atrScope.get().getUser().getAccountId()).isEqualTo(admin.id());
+
+    // Move the change to the destination branch.
+    assertThat(info(changeId).branch).isEqualTo(sourceBranch.shortName());
+    move(changeId, destinationBranch.shortName(), true);
+    assertThat(info(changeId).branch).isEqualTo(destinationBranch.shortName());
+
+    // Label is missing in the destination branch.
+    assertThat(gApi.changes().id(changeId).current().reviewer(user.email()).votes()).isEmpty();
+
+    // Move the change back to the source, the label is kept.
+    move(changeId, sourceBranch.shortName(), true);
+    assertThat(info(changeId).branch).isEqualTo(sourceBranch.shortName());
+    assertLabelVote(user, changeId, testLabelA, (short) 1);
+  }
+
+  @Test
+  public void moveChangeKeepAllVotesOutOfUserPermissionRange() throws Exception {
+    BranchNameKey destinationBranch = BranchNameKey.create(project, "dest");
+    createBranch(destinationBranch);
+    BranchNameKey sourceBranch = BranchNameKey.create(project, "source");
+    createBranch(sourceBranch);
+
+    String testLabelA = "Label-A";
+    // The label has the range [-2; 2]
+    configLabel(
+        project,
+        testLabelA,
+        LabelFunction.NO_BLOCK,
+        value(2, "Passes"),
+        value(1, "Mostly ok"),
+        value(0, "No score"),
+        value(-1, "Needs work"),
+        value(-2, "Failed"));
+    // Registered users have [-2; 2] permissions on the source.
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(
+            allowLabel(testLabelA).ref(sourceBranch.branch()).group(REGISTERED_USERS).range(-2, +2))
+        .update();
+
+    // Registered users have [-1; 1] permissions on the destination.
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(
+            allowLabel(testLabelA)
+                .ref(destinationBranch.branch())
+                .group(REGISTERED_USERS)
+                .range(-1, +1))
+        .update();
+
+    String changeId = createChangeInBranch(sourceBranch.branch()).getChangeId();
+    requestScopeOperations.setApiUser(user.id());
+    // Vote within the range of the source branch.
+    ReviewInput userReviewInput = new ReviewInput();
+    userReviewInput.label(testLabelA, 2);
+    gApi.changes().id(changeId).current().review(userReviewInput);
+
+    assertLabelVote(user, changeId, testLabelA, (short) 2);
+
+    requestScopeOperations.setApiUser(admin.id());
+    assertThat(atrScope.get().getUser().getAccountId()).isEqualTo(admin.id());
+
+    // Move the change to the destination branch.
+    assertThat(info(changeId).branch).isEqualTo(sourceBranch.shortName());
+    move(changeId, destinationBranch.branch(), true);
+    // User does not have label permissions for the same vote on the destination branch.
+    requestScopeOperations.setApiUser(user.id());
+    AuthException thrown =
+        assertThrows(
+            AuthException.class,
+            () -> gApi.changes().id(changeId).current().review(userReviewInput));
+    assertThat(thrown)
+        .hasMessageThat()
+        .isEqualTo(String.format("Applying label \"%s\": 2 is restricted", testLabelA));
+
+    // Label is kept even though the user's permission range is different from the source.
+    // Since we do not squash users votes based on the destination branch access label
+    // configuration, this is working as intended.
+    // It's the same behavior as when a project owner reduces user's permission range on label.
+    // Administrators should take this into account.
+    assertThat(info(changeId).branch).isEqualTo(destinationBranch.shortName());
+    assertLabelVote(user, changeId, testLabelA, (short) 2);
+
+    requestScopeOperations.setApiUser(admin.id());
+    // Move the change back to the source, the label is kept.
+    move(changeId, sourceBranch.shortName(), true);
+    assertThat(info(changeId).branch).isEqualTo(sourceBranch.shortName());
+    assertLabelVote(user, changeId, testLabelA, (short) 2);
+  }
+
+  @Test
+  public void moveKeepAllVotesCanMoveAllInRange() throws Exception {
+    BranchNameKey destinationBranch = BranchNameKey.create(project, "dest");
+    createBranch(destinationBranch);
+    BranchNameKey sourceBranch = BranchNameKey.create(project, "source");
+    createBranch(sourceBranch);
+
+    // The non-block label has the range [-2; 2]
+    String testLabelA = "Label-A";
+    configLabel(
+        project,
+        testLabelA,
+        LabelFunction.NO_BLOCK,
+        value(2, "Passes"),
+        value(1, "Mostly ok"),
+        value(0, "No score"),
+        value(-1, "Needs work"),
+        value(-2, "Failed"));
+
+    // Registered users have [-2; 2] permissions on all branches.
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allowLabel(testLabelA).ref("refs/heads/*").group(REGISTERED_USERS).range(-2, +2))
+        .update();
+
+    String changeId = createChangeInBranch(sourceBranch.branch()).getChangeId();
+
+    for (int vote = -2; vote <= 2; vote++) {
+      TestAccount testUser = accountCreator.create("TestUser" + vote);
+      requestScopeOperations.setApiUser(testUser.id());
+      ReviewInput userReviewInput = new ReviewInput();
+      userReviewInput.label(testLabelA, vote);
+      gApi.changes().id(changeId).current().review(userReviewInput);
+    }
+
+    assertThat(
+            gApi.changes().id(changeId).current().votes().get(testLabelA).stream()
+                .map(approvalInfo -> approvalInfo.value)
+                .collect(ImmutableList.toImmutableList()))
+        .containsExactly(-2, -1, 1, 2);
+
+    requestScopeOperations.setApiUser(admin.id());
+    // Move the change to the destination branch.
+    assertThat(info(changeId).branch).isEqualTo(sourceBranch.shortName());
+    move(changeId, destinationBranch.shortName(), true);
+    assertThat(info(changeId).branch).isEqualTo(destinationBranch.shortName());
+
+    // All votes are kept
+    assertThat(
+            gApi.changes().id(changeId).current().votes().get(testLabelA).stream()
+                .map(approvalInfo -> approvalInfo.value)
+                .collect(ImmutableList.toImmutableList()))
+        .containsExactly(-2, -1, 1, 2);
+
+    // Move the change back to the source, the label is kept.
+    move(changeId, sourceBranch.shortName(), true);
+    assertThat(info(changeId).branch).isEqualTo(sourceBranch.shortName());
+    assertThat(
+            gApi.changes().id(changeId).current().votes().get(testLabelA).stream()
+                .map(approvalInfo -> approvalInfo.value)
+                .collect(ImmutableList.toImmutableList()))
+        .containsExactly(-2, -1, 1, 2);
+  }
+
+  @Test
   public void moveChangeOnlyKeepVetoVotes() throws Exception {
     // A vote for a label will be kept after moving if the label's function is *WithBlock and the
     // vote holds the minimum value.
@@ -394,10 +616,28 @@
     gApi.changes().id(changeId).move(in);
   }
 
+  private void move(String changeId, String destination, boolean keepAllVotes)
+      throws RestApiException {
+    MoveInput in = new MoveInput();
+    in.destinationBranch = destination;
+    in.keepAllVotes = keepAllVotes;
+    gApi.changes().id(changeId).move(in);
+  }
+
   private PushOneCommit.Result createChange(String branch, String changeId) throws Exception {
     PushOneCommit push = pushFactory.create(admin.newIdent(), testRepo, changeId);
     PushOneCommit.Result result = push.to("refs/for/" + branch);
     result.assertOkStatus();
     return result;
   }
+
+  private PushOneCommit.Result createChangeInBranch(String branch) throws Exception {
+    return createChange("refs/for/" + branch);
+  }
+
+  private void assertLabelVote(TestAccount user, String changeId, String label, short vote)
+      throws Exception {
+    assertThat(gApi.changes().id(changeId).current().reviewer(user.email()).votes())
+        .containsEntry(label, vote);
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/rest/project/AccessIT.java b/javatests/com/google/gerrit/acceptance/rest/project/AccessIT.java
index 33d0d29..cf8efa7 100644
--- a/javatests/com/google/gerrit/acceptance/rest/project/AccessIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/project/AccessIT.java
@@ -78,6 +78,9 @@
 
   private static final String REFS_ALL = Constants.R_REFS + "*";
   private static final String REFS_HEADS = Constants.R_HEADS + "*";
+  private static final String REFS_META_VERSION = "refs/meta/version";
+  private static final String REFS_DRAFTS = "refs/draft-comments/*";
+  private static final String REFS_STARRED_CHANGES = "refs/starred-changes/*";
 
   private static final String LABEL_CODE_REVIEW = "Code-Review";
 
@@ -496,7 +499,10 @@
     AccessSectionInfo accessSectionInfo = createAccessSectionInfoDenyAll();
 
     // Disallow READ
-    accessInput.add.put(REFS_ALL, accessSectionInfo);
+    accessInput.add.put(REFS_META_VERSION, accessSectionInfo);
+    accessInput.add.put(REFS_DRAFTS, accessSectionInfo);
+    accessInput.add.put(REFS_STARRED_CHANGES, accessSectionInfo);
+    accessInput.add.put(REFS_HEADS, accessSectionInfo);
     pApi().access(accessInput);
 
     requestScopeOperations.setApiUser(user.id());
@@ -510,7 +516,10 @@
     AccessSectionInfo accessSectionInfo = createAccessSectionInfoDenyAll();
 
     // Disallow READ
-    accessInput.add.put(REFS_ALL, accessSectionInfo);
+    accessInput.add.put(REFS_META_VERSION, accessSectionInfo);
+    accessInput.add.put(REFS_DRAFTS, accessSectionInfo);
+    accessInput.add.put(REFS_STARRED_CHANGES, accessSectionInfo);
+    accessInput.add.put(REFS_HEADS, accessSectionInfo);
     pApi().access(accessInput);
 
     // Create a change to apply
diff --git a/javatests/com/google/gerrit/acceptance/rest/project/DeleteBranchIT.java b/javatests/com/google/gerrit/acceptance/rest/project/DeleteBranchIT.java
index c98a58e..ce92536 100644
--- a/javatests/com/google/gerrit/acceptance/rest/project/DeleteBranchIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/project/DeleteBranchIT.java
@@ -128,6 +128,7 @@
     projectOperations
         .project(project)
         .forUpdate()
+        .add(allow(Permission.READ).ref(metaRef).group(REGISTERED_USERS))
         .add(allow(Permission.CREATE).ref(metaRef).group(REGISTERED_USERS))
         .add(allow(Permission.PUSH).ref(metaRef).group(REGISTERED_USERS))
         .update();
diff --git a/javatests/com/google/gerrit/acceptance/rest/project/GetBranchIT.java b/javatests/com/google/gerrit/acceptance/rest/project/GetBranchIT.java
index b4b1be0..13c20dd 100644
--- a/javatests/com/google/gerrit/acceptance/rest/project/GetBranchIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/project/GetBranchIT.java
@@ -262,9 +262,12 @@
     requestScopeOperations.setApiUser(user.id());
     assertBranchFound(allUsers, RefNames.refsUsers(user.id()));
 
-    // TODO: every user can see the own user ref via the magic ref/users/self ref
-    // requestScopeOperations.setApiUser(user.id());
-    // assertBranchFound(allUsers, RefNames.REFS_USERS_SELF);
+    // every user can see the own user ref via the magic ref/users/self ref. For this special case,
+    // the branch in the request is refs/users/self, but the response contains the actual
+    // refs/users/$sharded_id/$id
+    BranchInfo branchInfo =
+        gApi.projects().name(allUsers.get()).branch(RefNames.REFS_USERS_SELF).get();
+    assertThat(branchInfo.ref).isEqualTo(RefNames.refsUsers(user.id()));
   }
 
   @Test
diff --git a/javatests/com/google/gerrit/acceptance/server/event/CommentAddedEventIT.java b/javatests/com/google/gerrit/acceptance/server/event/CommentAddedEventIT.java
index 002b860..fb3259f 100644
--- a/javatests/com/google/gerrit/acceptance/server/event/CommentAddedEventIT.java
+++ b/javatests/com/google/gerrit/acceptance/server/event/CommentAddedEventIT.java
@@ -26,6 +26,7 @@
 import com.google.gerrit.acceptance.ExtensionRegistry.Registration;
 import com.google.gerrit.acceptance.NoHttpd;
 import com.google.gerrit.acceptance.PushOneCommit;
+import com.google.gerrit.acceptance.config.GerritConfig;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
 import com.google.gerrit.entities.LabelType;
 import com.google.gerrit.extensions.api.changes.ReviewInput;
@@ -201,6 +202,25 @@
       assertThat(attr.value).isEqualTo(-1);
       assertThat(listener.getLastCommentAddedEvent().getComment())
           .isEqualTo(String.format("Patch Set 1:\n\n%s", label.getName()));
+
+      // review with patch set level comment
+      reviewInput = new ReviewInput().patchSetLevelComment("a patch set level comment");
+      revision(r).review(reviewInput);
+      assertThat(listener.getLastCommentAddedEvent().getComment())
+          .isEqualTo(String.format("Patch Set 1:\n\n%s", "a patch set level comment"));
+    }
+  }
+
+  @Test
+  @GerritConfig(name = "event.comment-added.publishPatchSetLevelComment", value = "false")
+  public void publishPatchSetLevelComment() throws Exception {
+    PushOneCommit.Result r = createChange();
+    TestListener listener = new TestListener();
+    try (Registration registration = extensionRegistry.newRegistration().add(listener)) {
+      ReviewInput reviewInput = new ReviewInput().patchSetLevelComment("a patch set level comment");
+      revision(r).review(reviewInput);
+      assertThat(listener.getLastCommentAddedEvent().getComment())
+          .isEqualTo(String.format("Patch Set 1:\n\n%s", "(1 comment)"));
     }
   }
 
diff --git a/javatests/com/google/gerrit/acceptance/server/permissions/ExternalUserPermissionIT.java b/javatests/com/google/gerrit/acceptance/server/permissions/ExternalUserPermissionIT.java
new file mode 100644
index 0000000..9e4907c
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/permissions/ExternalUserPermissionIT.java
@@ -0,0 +1,301 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.server.permissions;
+
+import static com.google.common.collect.ImmutableList.toImmutableList;
+import static com.google.common.collect.ImmutableSet.toImmutableSet;
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.permissionKey;
+import static com.google.gerrit.server.group.SystemGroupBackend.ANONYMOUS_USERS;
+import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.config.GerritConfig;
+import com.google.gerrit.acceptance.testsuite.change.ChangeOperations;
+import com.google.gerrit.acceptance.testsuite.group.GroupOperations;
+import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
+import com.google.gerrit.entities.AccountGroup;
+import com.google.gerrit.entities.Change;
+import com.google.gerrit.entities.GroupDescription;
+import com.google.gerrit.entities.GroupReference;
+import com.google.gerrit.entities.PatchSet;
+import com.google.gerrit.entities.Permission;
+import com.google.gerrit.entities.RefNames;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.ExternalUser;
+import com.google.gerrit.server.PropertyMap;
+import com.google.gerrit.server.account.GroupBackend;
+import com.google.gerrit.server.account.GroupMembership;
+import com.google.gerrit.server.account.externalids.ExternalId;
+import com.google.gerrit.server.notedb.ChangeNotes;
+import com.google.gerrit.server.permissions.ChangePermission;
+import com.google.gerrit.server.permissions.PermissionBackend;
+import com.google.gerrit.server.project.ProjectState;
+import com.google.inject.AbstractModule;
+import com.google.inject.Module;
+import java.util.Collection;
+import java.util.Set;
+import javax.inject.Inject;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.Repository;
+import org.junit.Before;
+import org.junit.Test;
+
+/** Tests that permission logic used by {@link ExternalUser} works as expected. */
+public class ExternalUserPermissionIT extends AbstractDaemonTest {
+  private static final AccountGroup.UUID EXTERNAL_GROUP =
+      AccountGroup.uuid("company-auth:it-department");
+
+  @Inject private ChangeOperations changeOperations;
+  @Inject private ProjectOperations projectOperations;
+  @Inject private PermissionBackend permissionBackend;
+  @Inject private ChangeNotes.Factory changeNotesFactory;
+  @Inject private ExternalUser.Factory externalUserFactory;
+  @Inject private GroupOperations groupOperations;
+
+  @Before
+  public void setUp() {
+    // Allow only read on refs/heads/master by default
+    projectOperations
+        .project(allProjects)
+        .forUpdate()
+        .remove(permissionKey(Permission.READ).ref("refs/heads/*").group(ANONYMOUS_USERS))
+        .add(allow(Permission.READ).ref("refs/heads/master").group(ANONYMOUS_USERS))
+        .update();
+  }
+
+  @Override
+  public Module createModule() {
+    /**
+     * Binding a {@link GroupBackend} that pretends a user is part of a group if the external ID
+     * starts with the group UUID.
+     *
+     * <p>Example: Users "company-auth:it-department-1" and "company-auth:it-department-2" are a
+     * member of the group "company-auth:it-department"
+     */
+    return new AbstractModule() {
+      @Override
+      protected void configure() {
+        DynamicSet.bind(binder(), GroupBackend.class)
+            .toInstance(
+                new GroupBackend() {
+                  @Override
+                  public boolean handles(AccountGroup.UUID uuid) {
+                    return uuid.get().startsWith("company-auth:");
+                  }
+
+                  @Override
+                  public GroupDescription.Basic get(AccountGroup.UUID uuid) {
+                    return new GroupDescription.Basic() {
+                      @Override
+                      public AccountGroup.UUID getGroupUUID() {
+                        return uuid;
+                      }
+
+                      @Override
+                      public String getName() {
+                        return uuid.get();
+                      }
+
+                      @Override
+                      public String getEmailAddress() {
+                        return uuid.get() + "@example.com";
+                      }
+
+                      @Override
+                      public String getUrl() {
+                        return null;
+                      }
+                    };
+                  }
+
+                  @Override
+                  public Collection<GroupReference> suggest(String name, ProjectState project) {
+                    throw new UnsupportedOperationException("not implemented");
+                  }
+
+                  @Override
+                  public GroupMembership membershipsOf(CurrentUser user) {
+                    return new GroupMembership() {
+                      @Override
+                      public boolean contains(AccountGroup.UUID groupId) {
+                        return user.getExternalIdKeys().stream()
+                            .anyMatch(e -> e.get().startsWith(groupId.get()));
+                      }
+
+                      @Override
+                      public boolean containsAnyOf(Iterable<AccountGroup.UUID> groupIds) {
+                        return ImmutableList.copyOf(groupIds).stream().anyMatch(g -> contains(g));
+                      }
+
+                      @Override
+                      public Set<AccountGroup.UUID> intersection(
+                          Iterable<AccountGroup.UUID> groupIds) {
+                        return ImmutableList.copyOf(groupIds).stream()
+                            .filter(g -> contains(g))
+                            .collect(toImmutableSet());
+                      }
+
+                      @Override
+                      public Set<AccountGroup.UUID> getKnownGroups() {
+                        return ImmutableSet.of();
+                      }
+                    };
+                  }
+
+                  @Override
+                  public boolean isVisibleToAll(AccountGroup.UUID uuid) {
+                    return false;
+                  }
+                });
+      }
+    };
+  }
+
+  @Test
+  public void defaultRefFilter_changeVisibilityIsAgnosticOfProvidedGroups() throws Exception {
+    ExternalUser user = createUserInGroup("1", "it-department");
+
+    Change.Id changeOnMaster = changeOperations.newChange().project(project).create();
+    Change.Id changeOnRefsMetaConfig =
+        changeOperations.newChange().project(project).branch("refs/meta/config").create();
+    // Check that only the change on the default branch is visible
+    assertThat(getVisibleRefNames(user))
+        .containsExactly(
+            "HEAD",
+            "refs/heads/master",
+            RefNames.changeMetaRef(changeOnMaster),
+            RefNames.patchSetRef(PatchSet.id(changeOnMaster, 1)));
+    // Grant access
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(Permission.READ).ref("refs/meta/config").group(EXTERNAL_GROUP))
+        .update();
+    // Check that both changes are visible now
+    assertThat(getVisibleRefNames(user))
+        .containsExactly(
+            "HEAD",
+            "refs/heads/master",
+            "refs/meta/config",
+            RefNames.changeMetaRef(changeOnMaster),
+            RefNames.patchSetRef(PatchSet.id(changeOnMaster, 1)),
+            RefNames.changeMetaRef(changeOnRefsMetaConfig),
+            RefNames.patchSetRef(PatchSet.id(changeOnRefsMetaConfig, 1)));
+  }
+
+  @Test
+  public void defaultRefFilter_refVisibilityIsAgnosticOfProvidedGroups() throws Exception {
+    ExternalUser user = createUserInGroup("1", "it-department");
+    // Check that refs/meta/config isn't visible by default
+    assertThat(getVisibleRefNames(user)).containsExactly("HEAD", "refs/heads/master");
+    // Grant access
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(Permission.READ).ref("refs/meta/config").group(EXTERNAL_GROUP))
+        .update();
+    // Check that refs/meta/config became visible
+    assertThat(getVisibleRefNames(user))
+        .containsExactly("HEAD", "refs/heads/master", "refs/meta/config");
+  }
+
+  @Test
+  public void changeVisibility_changeOnInvisibleBranchNotVisible() throws Exception {
+    // Create a change that is not visible to members of 'externalGroup'
+    Change.Id invisibleChange =
+        changeOperations.newChange().project(project).branch("refs/meta/config").create();
+    ExternalUser user = createUserInGroup("1", "it-department");
+    AuthException thrown =
+        assertThrows(
+            AuthException.class,
+            () ->
+                permissionBackend
+                    .user(user)
+                    .change(changeNotesFactory.create(project, invisibleChange))
+                    .check(ChangePermission.READ));
+    assertThat(thrown).hasMessageThat().isEqualTo("read not permitted");
+  }
+
+  @Test
+  public void changeVisibility_changeOnBranchVisibleToAnonymousIsVisible() throws Exception {
+    Change.Id changeId = changeOperations.newChange().project(project).create();
+    ExternalUser user = createUserInGroup("1", "it-department");
+    permissionBackend
+        .user(user)
+        .change(changeNotesFactory.create(project, changeId))
+        .check(ChangePermission.READ);
+  }
+
+  @Test
+  public void changeVisibility_changeOnBranchVisibleToRegisteredUsersIsVisible() throws Exception {
+    Change.Id changeId = changeOperations.newChange().project(project).create();
+    ExternalUser user = createUserInGroup("1", "it-department");
+    blockAnonymousRead();
+    permissionBackend
+        .user(user)
+        .change(changeNotesFactory.create(project, changeId))
+        .check(ChangePermission.READ);
+  }
+
+  @Test
+  public void externalUser_isContainedInternalGroupThatContainsExternalGroup() {
+    AccountGroup.UUID internalGroup =
+        groupOperations.newGroup().addSubgroup(EXTERNAL_GROUP).create();
+    ExternalUser user = createUserInGroup("1", "it-department");
+    assertThat(user.getEffectiveGroups().contains(internalGroup)).isTrue();
+    assertThat(user.getEffectiveGroups().contains(EXTERNAL_GROUP)).isTrue();
+    assertThat(user.getEffectiveGroups().contains(REGISTERED_USERS)).isTrue();
+    assertThat(user.getEffectiveGroups().contains(ANONYMOUS_USERS)).isTrue();
+  }
+
+  @GerritConfig(name = "groups.includeExternalUsersInRegisteredUsersGroup", value = "true")
+  @Test
+  public void externalUser_isContainedInRegisteredUsersIfConfigured() {
+    ExternalUser user = createUserInGroup("1", "it-department");
+    assertThat(user.getEffectiveGroups().contains(REGISTERED_USERS)).isTrue();
+  }
+
+  @GerritConfig(name = "groups.includeExternalUsersInRegisteredUsersGroup", value = "false")
+  @Test
+  public void externalUser_isNotContainedInRegisteredUsersIfNotConfigured() {
+    ExternalUser user = createUserInGroup("1", "it-department");
+    assertThat(user.getEffectiveGroups().contains(REGISTERED_USERS)).isFalse();
+  }
+
+  private ImmutableList<String> getVisibleRefNames(CurrentUser user) throws Exception {
+    try (Repository repo = repoManager.openRepository(project)) {
+      return permissionBackend.user(user).project(project)
+          .filter(
+              repo.getRefDatabase().getRefs(), repo, PermissionBackend.RefFilterOptions.defaults())
+          .stream()
+          .map(Ref::getName)
+          .collect(toImmutableList());
+    }
+  }
+
+  ExternalUser createUserInGroup(String userId, String groupId) {
+    return externalUserFactory.create(
+        ImmutableSet.of(),
+        ImmutableSet.of(ExternalId.Key.parse("company-auth:" + groupId + "-" + userId)),
+        PropertyMap.EMPTY);
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/server/util/BUILD b/javatests/com/google/gerrit/acceptance/server/util/BUILD
new file mode 100644
index 0000000..ea25784
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/util/BUILD
@@ -0,0 +1,7 @@
+load("//javatests/com/google/gerrit/acceptance:tests.bzl", "acceptance_tests")
+
+acceptance_tests(
+    srcs = glob(["*IT.java"]),
+    group = "server_util",
+    labels = ["server"],
+)
diff --git a/javatests/com/google/gerrit/acceptance/server/util/PluginLogFileIT.java b/javatests/com/google/gerrit/acceptance/server/util/PluginLogFileIT.java
new file mode 100644
index 0000000..06bf1ae
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/util/PluginLogFileIT.java
@@ -0,0 +1,58 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.server.util;
+
+import static junit.framework.TestCase.assertEquals;
+import static org.junit.Assert.fail;
+
+import com.google.gerrit.acceptance.AbstractPluginLogFileTest;
+import com.google.gerrit.acceptance.NoHttpd;
+import com.google.gerrit.acceptance.UseSsh;
+import com.google.inject.Inject;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import org.junit.Test;
+
+@NoHttpd
+@UseSsh
+public class PluginLogFileIT extends AbstractPluginLogFileTest {
+  @Inject private InvocationCounter invocationCounter;
+  private static final int NUMBER_OF_THREADS = 5;
+
+  @Test
+  public void testMultiThreadedPluginLogFile() throws Exception {
+    try (AutoCloseable ignored = installPlugin("my-plugin", Module.class)) {
+      ExecutorService service = Executors.newFixedThreadPool(NUMBER_OF_THREADS);
+      CountDownLatch latch = new CountDownLatch(NUMBER_OF_THREADS);
+      createChange();
+      for (int i = 0; i < NUMBER_OF_THREADS; i++) {
+        service.execute(
+            () -> {
+              try {
+                adminSshSession.exec("gerrit query --format json status:open --my-plugin--opt");
+                adminSshSession.assertSuccess();
+              } catch (Exception e) {
+                fail(e.getMessage());
+              } finally {
+                latch.countDown();
+              }
+            });
+      }
+      latch.await();
+      assertEquals(1, invocationCounter.getCounter());
+    }
+  }
+}
diff --git a/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java b/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
index 43a5ceb..f35bcb7 100644
--- a/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
+++ b/javatests/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
@@ -27,11 +27,6 @@
 public class ElasticIndexIT extends AbstractIndexTests {
 
   @ConfigSuite.Default
-  public static Config elasticsearchV6() {
-    return getConfig(ElasticVersion.V6_8);
-  }
-
-  @ConfigSuite.Config
   public static Config elasticsearchV7() {
     return getConfig(ElasticVersion.V7_8);
   }
diff --git a/javatests/com/google/gerrit/acceptance/ssh/SshDaemonIT.java b/javatests/com/google/gerrit/acceptance/ssh/SshDaemonIT.java
index 827c192..28d2a28 100644
--- a/javatests/com/google/gerrit/acceptance/ssh/SshDaemonIT.java
+++ b/javatests/com/google/gerrit/acceptance/ssh/SshDaemonIT.java
@@ -14,24 +14,19 @@
 
 package com.google.gerrit.acceptance.ssh;
 
-import com.google.common.flogger.FluentLogger;
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.TruthJUnit.assume;
+
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.NoHttpd;
 import com.google.gerrit.acceptance.Sandboxed;
 import com.google.gerrit.acceptance.UseSsh;
-import com.google.gerrit.server.config.SitePaths;
-import com.google.gerrit.server.restapi.config.ListTasks;
 import com.google.gerrit.testing.ConfigSuite;
-import com.google.inject.Inject;
 import com.google.inject.Module;
-import java.time.LocalDateTime;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import org.eclipse.jgit.lib.Config;
-import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -39,13 +34,7 @@
 @UseSsh
 @Sandboxed
 @RunWith(ConfigSuite.class)
-@SuppressWarnings("unused")
 public class SshDaemonIT extends AbstractDaemonTest {
-  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
-
-  @Inject private ListTasks listTasks;
-  @Inject private SitePaths gerritSitePath;
-
   @ConfigSuite.Parameter protected Config config;
 
   @ConfigSuite.Config
@@ -60,41 +49,34 @@
     return new TestSshCommandModule();
   }
 
-  public Future<Integer> startCommand(String command) throws Exception {
-    Callable<Integer> gracefulSession =
-        () -> {
-          int returnCode = -1;
-          logger.atFine().log("Before Command");
-          returnCode = userSshSession.execAndReturnStatus(command);
-          logger.atFine().log("After Command");
-          return returnCode;
-        };
+  @Test
+  public void nonGracefulCommandIsStoppedImmediately() throws Exception {
+    Future<Integer> future = startCommand(false);
+    restart();
+    assertThat(future.get()).isEqualTo(-1);
+  }
 
-    ExecutorService executor = Executors.newFixedThreadPool(1);
-    Future<Integer> future = executor.submit(gracefulSession);
+  @Test
+  public void gracefulCommandIsStoppedGracefully() throws Exception {
+    assume().that(isGracefulStopEnabled()).isTrue();
 
-    LocalDateTime timeout = LocalDateTime.now().plusSeconds(10);
+    Future<Integer> future = startCommand(true);
+    restart();
+    assertThat(future.get()).isEqualTo(0);
+  }
 
+  private Future<Integer> startCommand(boolean graceful) throws Exception {
+    Future<Integer> future =
+        Executors.newFixedThreadPool(1)
+            .submit(
+                () ->
+                    userSshSession.execAndReturnStatus(
+                        String.format("%sgraceful -d 5", graceful ? "" : "non-")));
     TestCommand.syncPoint.await();
-
     return future;
   }
 
-  @Test
-  public void NonGracefulCommandIsStoppedImmediately() throws Exception {
-    Future<Integer> future = startCommand("non-graceful -d 5");
-    restart();
-    Assert.assertTrue(future.get() == -1);
-  }
-
-  @Test
-  public void GracefulCommandIsStoppedGracefully() throws Exception {
-    Future<Integer> future = startCommand("graceful -d 5");
-    restart();
-    if (cfg.getTimeUnit("sshd", null, "gracefulStopTimeout", 0, TimeUnit.SECONDS) == 0) {
-      Assert.assertTrue(future.get() == -1);
-    } else {
-      Assert.assertTrue(future.get() == 0);
-    }
+  private boolean isGracefulStopEnabled() {
+    return cfg.getTimeUnit("sshd", null, "gracefulStopTimeout", 0, TimeUnit.SECONDS) > 0;
   }
 }
diff --git a/javatests/com/google/gerrit/elasticsearch/BUILD b/javatests/com/google/gerrit/elasticsearch/BUILD
index e269fc2..be35d5a 100644
--- a/javatests/com/google/gerrit/elasticsearch/BUILD
+++ b/javatests/com/google/gerrit/elasticsearch/BUILD
@@ -50,8 +50,6 @@
 
 SUFFIX = "sTest.java"
 
-ELASTICSEARCH_TESTS_V6 = {i: "ElasticV6Query" + i.capitalize() + SUFFIX for i in TYPES}
-
 ELASTICSEARCH_TESTS_V7 = {i: "ElasticV7Query" + i.capitalize() + SUFFIX for i in TYPES}
 
 ELASTICSEARCH_TAGS = [
@@ -61,14 +59,6 @@
 ]
 
 [junit_tests(
-    name = "elasticsearch_query_%ss_test_V6" % name,
-    size = "large",
-    srcs = [src],
-    tags = ELASTICSEARCH_TAGS,
-    deps = ELASTICSEARCH_DEPS + [QUERY_TESTS_DEP % name] + HTTP_TEST_DEPS,
-) for name, src in ELASTICSEARCH_TESTS_V6.items()]
-
-[junit_tests(
     name = "elasticsearch_query_%ss_test_V7" % name,
     size = "large",
     srcs = [src],
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java b/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
index 48295ea..e8cf3e9 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -39,12 +39,6 @@
 
   private static String getImageName(ElasticVersion version) {
     switch (version) {
-      case V6_8:
-        return "blacktop/elasticsearch:6.8.13";
-      case V7_0:
-        return "blacktop/elasticsearch:7.0.1";
-      case V7_1:
-        return "blacktop/elasticsearch:7.1.1";
       case V7_2:
         return "blacktop/elasticsearch:7.2.1";
       case V7_3:
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java
deleted file mode 100644
index 15d8dd6..0000000
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.elasticsearch;
-
-import com.google.gerrit.server.query.account.AbstractQueryAccountsTest;
-import com.google.gerrit.testing.ConfigSuite;
-import com.google.gerrit.testing.InMemoryModule;
-import com.google.gerrit.testing.IndexConfig;
-import com.google.inject.Guice;
-import com.google.inject.Injector;
-import org.eclipse.jgit.lib.Config;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-
-public class ElasticV6QueryAccountsTest extends AbstractQueryAccountsTest {
-  @ConfigSuite.Default
-  public static Config defaultConfig() {
-    return IndexConfig.createForElasticsearch();
-  }
-
-  private static ElasticContainer container;
-
-  @BeforeClass
-  public static void startIndexService() {
-    if (container == null) {
-      // Only start Elasticsearch once
-      container = ElasticContainer.createAndStart(ElasticVersion.V6_8);
-    }
-  }
-
-  @AfterClass
-  public static void stopElasticsearchServer() {
-    if (container != null) {
-      container.stop();
-    }
-  }
-
-  @Override
-  protected void initAfterLifecycleStart() throws Exception {
-    super.initAfterLifecycleStart();
-    ElasticTestUtils.createAllIndexes(injector);
-  }
-
-  @Override
-  protected Injector createInjector() {
-    Config elasticsearchConfig = new Config(config);
-    InMemoryModule.setDefaults(elasticsearchConfig);
-    String indicesPrefix = testName.getSanitizedMethodName();
-    ElasticTestUtils.configure(elasticsearchConfig, container, indicesPrefix);
-    return Guice.createInjector(new InMemoryModule(elasticsearchConfig));
-  }
-}
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
deleted file mode 100644
index d734f1e..0000000
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
+++ /dev/null
@@ -1,95 +0,0 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.elasticsearch;
-
-import static java.util.concurrent.TimeUnit.MINUTES;
-
-import com.google.gerrit.server.query.change.AbstractQueryChangesTest;
-import com.google.gerrit.testing.ConfigSuite;
-import com.google.gerrit.testing.GerritTestName;
-import com.google.gerrit.testing.InMemoryModule;
-import com.google.gerrit.testing.IndexConfig;
-import com.google.inject.Guice;
-import com.google.inject.Injector;
-import org.apache.http.client.methods.HttpPost;
-import org.apache.http.client.protocol.HttpClientContext;
-import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
-import org.apache.http.impl.nio.client.HttpAsyncClients;
-import org.eclipse.jgit.lib.Config;
-import org.junit.After;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Rule;
-
-public class ElasticV6QueryChangesTest extends AbstractQueryChangesTest {
-  @ConfigSuite.Default
-  public static Config defaultConfig() {
-    return IndexConfig.createForElasticsearch();
-  }
-
-  private static ElasticContainer container;
-  private static CloseableHttpAsyncClient client;
-
-  @BeforeClass
-  public static void startIndexService() {
-    if (container == null) {
-      // Only start Elasticsearch once
-      container = ElasticContainer.createAndStart(ElasticVersion.V6_8);
-      client = HttpAsyncClients.createDefault();
-      client.start();
-    }
-  }
-
-  @AfterClass
-  public static void stopElasticsearchServer() {
-    if (container != null) {
-      container.stop();
-    }
-  }
-
-  @Rule public final GerritTestName testName = new GerritTestName();
-
-  @After
-  public void closeIndex() throws Exception {
-    // Close the index after each test to prevent exceeding Elasticsearch's
-    // shard limit (see Issue 10120).
-    client
-        .execute(
-            new HttpPost(
-                String.format(
-                    "http://%s:%d/%s*/_close",
-                    container.getHttpHost().getHostName(),
-                    container.getHttpHost().getPort(),
-                    testName.getSanitizedMethodName())),
-            HttpClientContext.create(),
-            null)
-        .get(5, MINUTES);
-  }
-
-  @Override
-  protected void initAfterLifecycleStart() throws Exception {
-    super.initAfterLifecycleStart();
-    ElasticTestUtils.createAllIndexes(injector);
-  }
-
-  @Override
-  protected Injector createInjector() {
-    Config elasticsearchConfig = new Config(config);
-    InMemoryModule.setDefaults(elasticsearchConfig);
-    String indicesPrefix = testName.getSanitizedMethodName();
-    ElasticTestUtils.configure(elasticsearchConfig, container, indicesPrefix);
-    return Guice.createInjector(new InMemoryModule(elasticsearchConfig));
-  }
-}
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java
deleted file mode 100644
index 28d798e..0000000
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.elasticsearch;
-
-import com.google.gerrit.server.query.group.AbstractQueryGroupsTest;
-import com.google.gerrit.testing.ConfigSuite;
-import com.google.gerrit.testing.InMemoryModule;
-import com.google.gerrit.testing.IndexConfig;
-import com.google.inject.Guice;
-import com.google.inject.Injector;
-import org.eclipse.jgit.lib.Config;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-
-public class ElasticV6QueryGroupsTest extends AbstractQueryGroupsTest {
-  @ConfigSuite.Default
-  public static Config defaultConfig() {
-    return IndexConfig.createForElasticsearch();
-  }
-
-  private static ElasticContainer container;
-
-  @BeforeClass
-  public static void startIndexService() {
-    if (container == null) {
-      // Only start Elasticsearch once
-      container = ElasticContainer.createAndStart(ElasticVersion.V6_8);
-    }
-  }
-
-  @AfterClass
-  public static void stopElasticsearchServer() {
-    if (container != null) {
-      container.stop();
-    }
-  }
-
-  @Override
-  protected void initAfterLifecycleStart() throws Exception {
-    super.initAfterLifecycleStart();
-    ElasticTestUtils.createAllIndexes(injector);
-  }
-
-  @Override
-  protected Injector createInjector() {
-    Config elasticsearchConfig = new Config(config);
-    InMemoryModule.setDefaults(elasticsearchConfig);
-    String indicesPrefix = testName.getSanitizedMethodName();
-    ElasticTestUtils.configure(elasticsearchConfig, container, indicesPrefix);
-    return Guice.createInjector(new InMemoryModule(elasticsearchConfig));
-  }
-}
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryProjectsTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryProjectsTest.java
deleted file mode 100644
index 6658d72..0000000
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryProjectsTest.java
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.elasticsearch;
-
-import com.google.gerrit.server.query.project.AbstractQueryProjectsTest;
-import com.google.gerrit.testing.ConfigSuite;
-import com.google.gerrit.testing.InMemoryModule;
-import com.google.gerrit.testing.IndexConfig;
-import com.google.inject.Guice;
-import com.google.inject.Injector;
-import org.eclipse.jgit.lib.Config;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-
-public class ElasticV6QueryProjectsTest extends AbstractQueryProjectsTest {
-  @ConfigSuite.Default
-  public static Config defaultConfig() {
-    return IndexConfig.createForElasticsearch();
-  }
-
-  private static ElasticContainer container;
-
-  @BeforeClass
-  public static void startIndexService() {
-    if (container == null) {
-      // Only start Elasticsearch once
-      container = ElasticContainer.createAndStart(ElasticVersion.V6_8);
-    }
-  }
-
-  @AfterClass
-  public static void stopElasticsearchServer() {
-    if (container != null) {
-      container.stop();
-    }
-  }
-
-  @Override
-  protected void initAfterLifecycleStart() throws Exception {
-    super.initAfterLifecycleStart();
-    ElasticTestUtils.createAllIndexes(injector);
-  }
-
-  @Override
-  protected Injector createInjector() {
-    Config elasticsearchConfig = new Config(config);
-    InMemoryModule.setDefaults(elasticsearchConfig);
-    String indicesPrefix = testName.getSanitizedMethodName();
-    ElasticTestUtils.configure(elasticsearchConfig, container, indicesPrefix);
-    return Guice.createInjector(new InMemoryModule(elasticsearchConfig));
-  }
-}
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
index 9325a1b..1ec8a5d 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticVersionTest.java
@@ -22,15 +22,6 @@
 public class ElasticVersionTest {
   @Test
   public void supportedVersion() throws Exception {
-    assertThat(ElasticVersion.forVersion("6.8.0")).isEqualTo(ElasticVersion.V6_8);
-    assertThat(ElasticVersion.forVersion("6.8.1")).isEqualTo(ElasticVersion.V6_8);
-
-    assertThat(ElasticVersion.forVersion("7.0.0")).isEqualTo(ElasticVersion.V7_0);
-    assertThat(ElasticVersion.forVersion("7.0.1")).isEqualTo(ElasticVersion.V7_0);
-
-    assertThat(ElasticVersion.forVersion("7.1.0")).isEqualTo(ElasticVersion.V7_1);
-    assertThat(ElasticVersion.forVersion("7.1.1")).isEqualTo(ElasticVersion.V7_1);
-
     assertThat(ElasticVersion.forVersion("7.2.0")).isEqualTo(ElasticVersion.V7_2);
     assertThat(ElasticVersion.forVersion("7.2.1")).isEqualTo(ElasticVersion.V7_2);
 
@@ -64,46 +55,4 @@
             "Unsupported version: [4.0.0]. Supported versions: "
                 + ElasticVersion.supportedVersions());
   }
-
-  @Test
-  public void atLeastMinorVersion() throws Exception {
-    assertThat(ElasticVersion.V6_8.isAtLeastMinorVersion(ElasticVersion.V6_8)).isTrue();
-    assertThat(ElasticVersion.V7_0.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_1.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_2.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_3.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_4.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_5.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_6.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_7.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-    assertThat(ElasticVersion.V7_8.isAtLeastMinorVersion(ElasticVersion.V6_8)).isFalse();
-  }
-
-  @Test
-  public void version6OrLater() throws Exception {
-    assertThat(ElasticVersion.V6_8.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_0.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_1.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_2.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_3.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_4.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_5.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_6.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_7.isV6OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_8.isV6OrLater()).isTrue();
-  }
-
-  @Test
-  public void version7OrLater() throws Exception {
-    assertThat(ElasticVersion.V6_8.isV7OrLater()).isFalse();
-    assertThat(ElasticVersion.V7_0.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_1.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_2.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_3.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_4.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_5.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_6.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_7.isV7OrLater()).isTrue();
-    assertThat(ElasticVersion.V7_8.isV7OrLater()).isTrue();
-  }
 }
diff --git a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
index 77ab58b..ba9475f 100644
--- a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
+++ b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
@@ -15,6 +15,7 @@
 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;
 
@@ -53,8 +54,15 @@
     String testCanonicalUrl = "foo-url";
     String testCdnPath = "bar-cdn";
     String testFaviconURL = "zaz-url";
+
+    String disabledDefault = IndexHtmlUtil.DEFAULT_EXPERIMENTS.asList().get(0);
+    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));
     IndexServlet servlet =
-        new IndexServlet(testCanonicalUrl, testCdnPath, testFaviconURL, gerritApi);
+        new IndexServlet(testCanonicalUrl, testCdnPath, testFaviconURL, gerritApi, serverConfig);
 
     FakeHttpServletResponse response = new FakeHttpServletResponse();
 
@@ -76,6 +84,15 @@
                 + "'\\x7b\\x22\\/config\\/server\\/version\\x22: \\x22123\\x22, "
                 + "\\x22\\/config\\/server\\/info\\x22: \\x7b\\x22default_theme\\x22:"
                 + "\\x22my-default-theme\\x22\\x7d, \\x22\\/config\\/server\\/top-menus\\x22: "
-                + "\\x5b\\x5d\\x7d');</script>");
+                + "\\x5b\\x5d\\x7d');");
+    String enabledDefaults =
+        IndexHtmlUtil.DEFAULT_EXPERIMENTS.stream()
+            .filter(e -> !e.equals(disabledDefault))
+            .collect(joining("\\x22,"));
+    assertThat(output)
+        .contains(
+            "window.ENABLED_EXPERIMENTS = JSON.parse('\\x5b\\x22NewFeature\\x22,\\x22"
+                + enabledDefaults
+                + "\\x22\\x5d');</script>");
   }
 }
diff --git a/javatests/com/google/gerrit/integration/git/GitProtocolV2IT.java b/javatests/com/google/gerrit/integration/git/GitProtocolV2IT.java
index 76ce956..b52fcf46 100644
--- a/javatests/com/google/gerrit/integration/git/GitProtocolV2IT.java
+++ b/javatests/com/google/gerrit/integration/git/GitProtocolV2IT.java
@@ -91,7 +91,7 @@
       projectOperations
           .project(project)
           .forUpdate()
-          .add(deny(Permission.READ).ref("refs/*").group(SystemGroupBackend.ANONYMOUS_USERS))
+          .add(deny(Permission.READ).ref("refs/heads/*").group(SystemGroupBackend.ANONYMOUS_USERS))
           .add(
               allow(Permission.READ)
                   .ref("refs/heads/master")
diff --git a/javatests/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializerTest.java b/javatests/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializerTest.java
index 3a51b70..e293493 100644
--- a/javatests/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializerTest.java
+++ b/javatests/com/google/gerrit/server/cache/serialize/entities/StoredCommentLinkInfoSerializerTest.java
@@ -56,4 +56,19 @@
             .build();
     assertThat(deserialize(serialize(autoValue))).isEqualTo(autoValue);
   }
+
+  @Test
+  public void nullEnabled_roundTrip() {
+    StoredCommentLinkInfo sourceAutoValue =
+        StoredCommentLinkInfo.builder("name").setLink("<p>html").setMatch("*").build();
+
+    StoredCommentLinkInfo storedAutoValue =
+        StoredCommentLinkInfo.builder("name")
+            .setLink("<p>html")
+            .setMatch("*")
+            .setEnabled(true)
+            .build();
+
+    assertThat(deserialize(serialize(sourceAutoValue))).isEqualTo(storedAutoValue);
+  }
 }
diff --git a/javatests/com/google/gerrit/server/index/change/ChangeIndexRewriterTest.java b/javatests/com/google/gerrit/server/index/change/ChangeIndexRewriterTest.java
index f5d3bf7..e5b2ffb 100644
--- a/javatests/com/google/gerrit/server/index/change/ChangeIndexRewriterTest.java
+++ b/javatests/com/google/gerrit/server/index/change/ChangeIndexRewriterTest.java
@@ -107,6 +107,32 @@
   }
 
   @Test
+  public void threeLevelTreeWithMultipleSources() throws Exception {
+    Predicate<ChangeData> in = parse("-status:abandoned (foo:a OR file:b)");
+    Predicate<ChangeData> out = rewrite(in);
+    assertThat(out.getClass()).isSameInstanceAs(AndChangeSource.class);
+
+    Predicate<ChangeData> firstIndexedSubQuery = parse("-status:abandoned");
+
+    assertThat(out.getChild(0)).isEqualTo(query(firstIndexedSubQuery));
+
+    assertThat(out.getChild(1).getClass()).isSameInstanceAs(OrSource.class);
+    OrSource indexedSubTree = (OrSource) out.getChild(1);
+
+    Predicate<ChangeData> secondIndexedSubQuery = parse("foo:a OR file:b");
+    assertThat(indexedSubTree.getChildren())
+        .containsExactly(
+            query(secondIndexedSubQuery.getChild(1)), secondIndexedSubQuery.getChild(0))
+        .inOrder();
+
+    // Same at the assertions above, that were added for readability
+    assertThat(out.getChild(0)).isEqualTo(query(in.getChild(0)));
+    assertThat(indexedSubTree.getChildren())
+        .containsExactly(query(in.getChild(1).getChild(1)), in.getChild(1).getChild(0))
+        .inOrder();
+  }
+
+  @Test
   public void threeLevelTreeWithSomeIndexPredicates() throws Exception {
     Predicate<ChangeData> in = parse("-foo:a (file:b OR file:c)");
     Predicate<ChangeData> out = rewrite(in);
diff --git a/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java b/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java
index bae2f46c..ae7727d 100644
--- a/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java
+++ b/javatests/com/google/gerrit/server/notedb/ChangeNotesTest.java
@@ -3258,6 +3258,34 @@
   }
 
   @Test
+  public void resetCherryPickOf() throws Exception {
+    Change destinationChange = newChange();
+    Change cherryPickChange = newChange();
+    assertThat(newNotes(destinationChange).getChange().getCherryPickOf()).isNull();
+
+    ChangeUpdate update = newUpdate(destinationChange, changeOwner);
+    update.setCherryPickOf(
+        cherryPickChange.currentPatchSetId().getCommaSeparatedChangeAndPatchSetId());
+    update.commit();
+    assertThat(newNotes(destinationChange).getChange().getCherryPickOf())
+        .isEqualTo(cherryPickChange.currentPatchSetId());
+
+    update = newUpdate(destinationChange, changeOwner);
+    update.resetCherryPickOf();
+    update.commit();
+    assertThat(newNotes(destinationChange).getChange().getCherryPickOf()).isNull();
+
+    // Can set again after reset.
+    cherryPickChange = newChange();
+    update = newUpdate(destinationChange, changeOwner);
+    update.setCherryPickOf(
+        cherryPickChange.currentPatchSetId().getCommaSeparatedChangeAndPatchSetId());
+    update.commit();
+    assertThat(newNotes(destinationChange).getChange().getCherryPickOf())
+        .isEqualTo(cherryPickChange.currentPatchSetId());
+  }
+
+  @Test
   public void updateCount() throws Exception {
     Change c = newChange();
     assertThat(newNotes(c).getUpdateCount()).isEqualTo(1);
diff --git a/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java b/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java
index 6cfd9f2d..ededc42 100644
--- a/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java
+++ b/javatests/com/google/gerrit/server/notedb/CommitMessageOutputTest.java
@@ -61,8 +61,7 @@
             + "Reviewer: Gerrit User 1 <1@gerrit>\n"
             + "CC: Gerrit User 2 <2@gerrit>\n"
             + "Label: Code-Review=-1\n"
-            + "Label: Verified=+1\n"
-            + "Attention: {\"person_ident\":\"Gerrit User 1 \\u003c1@gerrit\\u003e\",\"operation\":\"ADD\",\"reason\":\"Reviewer was added\"}\n",
+            + "Label: Verified=+1\n",
         commit);
 
     PersonIdent author = commit.getAuthorIdent();
@@ -245,8 +244,7 @@
     update.commit();
 
     assertBodyEquals(
-        "Update patch set 1\n\nPatch-set: 1\nReviewer: Gerrit User 1 <1@gerrit>\n"
-            + "Attention: {\"person_ident\":\"Gerrit User 1 \\u003c1@gerrit\\u003e\",\"operation\":\"ADD\",\"reason\":\"Reviewer was added\"}\n",
+        "Update patch set 1\n\nPatch-set: 1\nReviewer: Gerrit User 1 <1@gerrit>\n",
         update.getResult());
   }
 
diff --git a/javatests/com/google/gerrit/server/permissions/RefControlTest.java b/javatests/com/google/gerrit/server/permissions/RefControlTest.java
index 65196bf..87db21f 100644
--- a/javatests/com/google/gerrit/server/permissions/RefControlTest.java
+++ b/javatests/com/google/gerrit/server/permissions/RefControlTest.java
@@ -45,6 +45,7 @@
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.exceptions.InvalidNameException;
 import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.InternalUser;
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.account.ListGroupMembership;
 import com.google.gerrit.server.config.AllProjectsName;
@@ -313,6 +314,11 @@
   }
 
   @Test
+  public void userRefIsVisibleForInternalUser() throws Exception {
+    internalUser(localKey).controlForRef("refs/users/default").asForRef().check(RefPermission.READ);
+  }
+
+  @Test
   public void branchDelegation1() throws Exception {
     projectOperations
         .project(localKey)
@@ -1220,6 +1226,10 @@
     return projectCache.get(nameKey).orElseThrow(illegalState(nameKey));
   }
 
+  private ProjectControl internalUser(Project.NameKey localKey) throws Exception {
+    return projectControlFactory.create(new InternalUser(), getProjectState(localKey));
+  }
+
   private ProjectControl user(Project.NameKey localKey, AccountGroup.UUID... memberOf)
       throws Exception {
     return user(localKey, null, memberOf);
diff --git a/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java b/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
index 1de548f..e440be0 100644
--- a/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
+++ b/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
@@ -85,6 +85,7 @@
 import com.google.gerrit.index.FieldDef;
 import com.google.gerrit.index.IndexConfig;
 import com.google.gerrit.index.Schema;
+import com.google.gerrit.index.query.IndexPredicate;
 import com.google.gerrit.index.query.Predicate;
 import com.google.gerrit.index.query.QueryParseException;
 import com.google.gerrit.lifecycle.LifecycleManager;
@@ -110,6 +111,7 @@
 import com.google.gerrit.server.index.change.ChangeField;
 import com.google.gerrit.server.index.change.ChangeIndexCollection;
 import com.google.gerrit.server.index.change.ChangeIndexer;
+import com.google.gerrit.server.index.change.IndexedChangeQuery;
 import com.google.gerrit.server.notedb.ChangeNotes;
 import com.google.gerrit.server.notedb.Sequences;
 import com.google.gerrit.server.project.ProjectCache;
@@ -1573,6 +1575,10 @@
     assertThat(nowMs - lastUpdatedMs(change2)).isEqualTo(thirtyHoursInMs);
     assertThat(TimeUtil.nowMs()).isEqualTo(nowMs);
 
+    // Change1 was last updated on 2009-09-30 21:00:00 -0000
+    // Change2 was last updated on 2009-10-02 03:00:00 -0000
+    // The endpoint is 2009-10-03 09:00:00 -0000
+
     assertQuery("-age:1d");
     assertQuery("-age:" + (30 * 60 - 1) + "m");
     assertQuery("-age:2d", change2);
@@ -1580,6 +1586,15 @@
     assertQuery("age:3d");
     assertQuery("age:2d", change1);
     assertQuery("age:1d", change2, change1);
+
+    // Same test as above, but using filter code path.
+    assertQuery(makeIndexedPredicateFilterQuery("-age:1d"));
+    assertQuery(makeIndexedPredicateFilterQuery("-age:" + (30 * 60 - 1) + "m"));
+    assertQuery(makeIndexedPredicateFilterQuery("-age:2d"), change2);
+    assertQuery(makeIndexedPredicateFilterQuery("-age:3d"), change2, change1);
+    assertQuery(makeIndexedPredicateFilterQuery("age:3d"));
+    assertQuery(makeIndexedPredicateFilterQuery("age:2d"), change1);
+    assertQuery(makeIndexedPredicateFilterQuery("age:1d"), change2, change1);
   }
 
   @Test
@@ -1592,6 +1607,9 @@
     Change change2 = insert(repo, newChange(repo), null, new Timestamp(startMs + thirtyHoursInMs));
     TestTimeUtil.setClockStep(0, MILLISECONDS);
 
+    // Change1 was last updated on 2009-09-30 21:00:00 -0000
+    // Change2 was last updated on 2009-10-02 03:00:00 -0000
+
     for (String predicate : Lists.newArrayList("before:", "until:")) {
       assertQuery(predicate + "2009-09-29");
       assertQuery(predicate + "2009-09-30");
@@ -1604,6 +1622,22 @@
       assertQuery(predicate + "2009-10-01", change1);
       assertQuery(predicate + "2009-10-03", change2, change1);
     }
+
+    // Same test as above, but using filter code path.
+    for (String predicate : Lists.newArrayList("before:", "until:")) {
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-09-29"));
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-09-30"));
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "\"2009-09-30 16:59:00 -0400\""));
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "\"2009-09-30 20:59:00 -0000\""));
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "\"2009-09-30 20:59:00\""));
+      assertQuery(
+          makeIndexedPredicateFilterQuery(predicate + "\"2009-09-30 17:02:00 -0400\""), change1);
+      assertQuery(
+          makeIndexedPredicateFilterQuery(predicate + "\"2009-10-01 21:02:00 -0000\""), change1);
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "\"2009-10-01 21:02:00\""), change1);
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-10-01"), change1);
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-10-03"), change2, change1);
+    }
   }
 
   @Test
@@ -1616,6 +1650,8 @@
     Change change2 = insert(repo, newChange(repo), null, new Timestamp(startMs + thirtyHoursInMs));
     TestTimeUtil.setClockStep(0, MILLISECONDS);
 
+    // Change1 was last updated on 2009-09-30 21:00:00 -0000
+    // Change2 was last updated on 2009-10-02 03:00:00 -0000
     for (String predicate : Lists.newArrayList("after:", "since:")) {
       assertQuery(predicate + "2009-10-03");
       assertQuery(predicate + "\"2009-10-01 20:59:59 -0400\"", change2);
@@ -1623,6 +1659,197 @@
       assertQuery(predicate + "2009-10-01", change2);
       assertQuery(predicate + "2009-09-30", change2, change1);
     }
+
+    // Same test as above, but using filter code path.
+    for (String predicate : Lists.newArrayList("after:", "since:")) {
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-10-03"));
+      assertQuery(
+          makeIndexedPredicateFilterQuery(predicate + "\"2009-10-01 20:59:59 -0400\""), change2);
+      assertQuery(
+          makeIndexedPredicateFilterQuery(predicate + "\"2009-10-01 20:59:59 -0000\""), change2);
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-10-01"), change2);
+      assertQuery(makeIndexedPredicateFilterQuery(predicate + "2009-09-30"), change2, change1);
+    }
+  }
+
+  @Test
+  public void mergedOperatorSupportedByIndexVersion() throws Exception {
+    if (getSchemaVersion() < 61) {
+      assertMissingField(ChangeField.MERGED_ON);
+      assertFailingQuery(
+          "mergedbefore:2009-10-01",
+          "'mergedbefore' operator is not supported by change index version");
+      assertFailingQuery(
+          "mergedafter:2009-10-01",
+          "'mergedafter' operator is not supported by change index version");
+    } else {
+      assertThat(getSchema().hasField(ChangeField.MERGED_ON)).isTrue();
+    }
+  }
+
+  @Test
+  public void byMergedBefore() throws Exception {
+    assume().that(getSchema().hasField(ChangeField.MERGED_ON)).isTrue();
+    long thirtyHoursInMs = MILLISECONDS.convert(30, HOURS);
+
+    // Stop the clock, will set time to specific test values.
+    resetTimeWithClockStep(0, MILLISECONDS);
+    TestRepository<Repo> repo = createProject("repo");
+    long startMs = TestTimeUtil.START.toEpochMilli();
+    TestTimeUtil.setClock(new Timestamp(startMs));
+    Change change1 = insert(repo, newChange(repo));
+    Change change2 = insert(repo, newChange(repo));
+    Change change3 = insert(repo, newChange(repo));
+
+    TestTimeUtil.setClock(new Timestamp(startMs + thirtyHoursInMs));
+    submit(change3);
+    TestTimeUtil.setClock(new Timestamp(startMs + 2 * thirtyHoursInMs));
+    submit(change2);
+    TestTimeUtil.setClock(new Timestamp(startMs + 3 * thirtyHoursInMs));
+    // Put another approval on the change, just to update it.
+    approve(change1);
+    approve(change3);
+
+    assertThat(TimeUtil.nowMs()).isEqualTo(startMs + 3 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change3)).isEqualTo(startMs + 3 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change2)).isEqualTo(startMs + 2 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change1)).isEqualTo(startMs + 3 * thirtyHoursInMs);
+
+    // Verify that:
+    // 1. Change1 was not submitted and should be never returned.
+    // 2. Change2 was merged on 2009-10-02 03:00:00 -0000
+    // 3. Change3 was merged on 2009-10-03 09:00:00.0 -0000
+    assertQuery("mergedbefore:2009-10-01");
+    // Changes excluded on the date submitted.
+    assertQuery("mergedbefore:2009-10-02");
+    assertQuery("mergedbefore:\"2009-10-01 22:59:00 -0400\"");
+    assertQuery("mergedbefore:\"2009-10-01 02:59:00\"");
+    assertQuery("mergedbefore:\"2009-10-01 23:02:00 -0400\"", change3);
+    assertQuery("mergedbefore:\"2009-10-02 03:02:00 -0000\"", change3);
+    assertQuery("mergedbefore:\"2009-10-02 03:02:00\"", change3);
+    assertQuery("mergedbefore:2009-10-03", change3);
+    // Changes are sorted by lastUpdatedOn first, then by mergedOn.
+    // Even though Change2 was merged after Change3, Change3 is returned first.
+    assertQuery("mergedbefore:2009-10-04", change3, change2);
+
+    // Same test as above, but using filter code path.
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:2009-10-01"));
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:2009-10-02"));
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:\"2009-10-01 22:59:00 -0400\""));
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:\"2009-10-01 02:59:00\""));
+    assertQuery(
+        makeIndexedPredicateFilterQuery("mergedbefore:\"2009-10-01 23:02:00 -0400\""), change3);
+    assertQuery(
+        makeIndexedPredicateFilterQuery("mergedbefore:\"2009-10-02 03:02:00 -0000\""), change3);
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:\"2009-10-02 03:02:00\""), change3);
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:2009-10-03"), change3);
+    assertQuery(makeIndexedPredicateFilterQuery("mergedbefore:2009-10-04"), change3, change2);
+  }
+
+  @Test
+  public void byMergedAfter() throws Exception {
+    assume().that(getSchema().hasField(ChangeField.MERGED_ON)).isTrue();
+    long thirtyHoursInMs = MILLISECONDS.convert(30, HOURS);
+
+    // Stop the clock, will set time to specific test values.
+    resetTimeWithClockStep(0, MILLISECONDS);
+    TestRepository<Repo> repo = createProject("repo");
+    long startMs = TestTimeUtil.START.toEpochMilli();
+    TestTimeUtil.setClock(new Timestamp(startMs));
+    Change change1 = insert(repo, newChange(repo));
+    Change change2 = insert(repo, newChange(repo));
+    Change change3 = insert(repo, newChange(repo));
+    assertThat(TimeUtil.nowMs()).isEqualTo(startMs);
+
+    TestTimeUtil.setClock(new Timestamp(startMs + thirtyHoursInMs));
+    submit(change3);
+
+    TestTimeUtil.setClock(new Timestamp(startMs + 2 * thirtyHoursInMs));
+    submit(change2);
+
+    TestTimeUtil.setClock(new Timestamp(startMs + 3 * thirtyHoursInMs));
+    // Put another approval on the change, just to update it.
+    approve(change1);
+    approve(change3);
+
+    assertThat(TimeUtil.nowMs()).isEqualTo(startMs + 3 * thirtyHoursInMs);
+
+    assertThat(lastUpdatedMsApi(change3)).isEqualTo(startMs + 3 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change2)).isEqualTo(startMs + 2 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change1)).isEqualTo(startMs + 3 * thirtyHoursInMs);
+
+    // Verify that:
+    // 1. Change1 was not submitted and should be never returned.
+    // 2. Change2 was merged on 2009-10-02 03:00:00 -0000
+    // 3. Change3 was merged on 2009-10-03 09:00:00.0 -0000
+    assertQuery("mergedafter:2009-10-01", change3, change2);
+    // Changes are sorted by lastUpdatedOn first, then by mergedOn.
+    // Even though Change2 was merged after Change3, Change3 is returned first.
+    assertQuery("mergedafter:\"2009-10-01 22:59:00 -0400\"", change3, change2);
+    assertQuery("mergedafter:\"2009-10-02 02:59:00 -0000\"", change3, change2);
+    assertQuery("mergedafter:\"2009-10-01 23:02:00 -0400\"", change2);
+    assertQuery("mergedafter:\"2009-10-02 03:02:00 -0000\"", change2);
+    // Changes included on the date submitted.
+    assertQuery("mergedafter:2009-10-02", change3, change2);
+    assertQuery("mergedafter:2009-10-03", change2);
+
+    // Same test as above, but using filter code path.
+
+    assertQuery(makeIndexedPredicateFilterQuery("mergedafter:2009-10-01"), change3, change2);
+    // Changes are sorted by lastUpdatedOn first, then by mergedOn.
+    // Even though Change2 was merged after Change3, Change3 is returned first.
+    assertQuery(
+        makeIndexedPredicateFilterQuery("mergedafter:\"2009-10-01 22:59:00 -0400\""),
+        change3,
+        change2);
+    assertQuery(
+        makeIndexedPredicateFilterQuery("mergedafter:\"2009-10-02 02:59:00 -0000\""),
+        change3,
+        change2);
+    assertQuery(
+        makeIndexedPredicateFilterQuery("mergedafter:\"2009-10-01 23:02:00 -0400\""), change2);
+    assertQuery(
+        makeIndexedPredicateFilterQuery("mergedafter:\"2009-10-02 03:02:00 -0000\""), change2);
+    // Changes included on the date submitted.
+    assertQuery(makeIndexedPredicateFilterQuery("mergedafter:2009-10-02"), change3, change2);
+    assertQuery(makeIndexedPredicateFilterQuery("mergedafter:2009-10-03"), change2);
+  }
+
+  @Test
+  public void updatedThenMergedOrder() throws Exception {
+    assume().that(getSchema().hasField(ChangeField.MERGED_ON)).isTrue();
+    long thirtyHoursInMs = MILLISECONDS.convert(30, HOURS);
+
+    // Stop the clock, will set time to specific test values.
+    resetTimeWithClockStep(0, MILLISECONDS);
+    TestRepository<Repo> repo = createProject("repo");
+    long startMs = TestTimeUtil.START.toEpochMilli();
+    TestTimeUtil.setClock(new Timestamp(startMs));
+
+    Change change1 = insert(repo, newChange(repo));
+    Change change2 = insert(repo, newChange(repo));
+    Change change3 = insert(repo, newChange(repo));
+
+    TestTimeUtil.setClock(new Timestamp(startMs + thirtyHoursInMs));
+    submit(change2);
+    submit(change3);
+    TestTimeUtil.setClock(new Timestamp(startMs + 2 * thirtyHoursInMs));
+    // Approve post submit just to update lastUpdatedOn
+    approve(change3);
+    approve(change2);
+    submit(change1);
+
+    // All Changes were last updated at the same time.
+    assertThat(lastUpdatedMsApi(change3)).isEqualTo(startMs + 2 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change2)).isEqualTo(startMs + 2 * thirtyHoursInMs);
+    assertThat(lastUpdatedMsApi(change1)).isEqualTo(startMs + 2 * thirtyHoursInMs);
+
+    // Changes are sorted by lastUpdatedOn first, then by mergedOn, then by Id in reverse order.
+    // 1. Change3 and Change2 were merged at the same time, but Change3 ID > Change2 ID.
+    // 2. Change1 ID < Change3 ID & Change2 ID but it was merged last.
+    assertQuery("mergedbefore:2009-10-06", change1, change3, change2);
+    assertQuery("mergedafter:2009-09-30", change1, change3, change2);
+    assertQuery("status:merged", change1, change3, change2);
   }
 
   @Test
@@ -3589,6 +3816,62 @@
     return c.getLastUpdatedOn().getTime();
   }
 
+  // Get the last  updated time from ChangeApi
+  protected long lastUpdatedMsApi(Change c) throws Exception {
+    return gApi.changes().id(c.getChangeId()).get().updated.getTime();
+  }
+
+  protected void approve(Change change) throws Exception {
+    gApi.changes().id(change.getChangeId()).current().review(ReviewInput.approve());
+  }
+
+  protected void submit(Change change) throws Exception {
+    approve(change);
+    gApi.changes().id(change.getChangeId()).current().submit();
+  }
+
+  /**
+   * Generates a search query to test {@link com.google.gerrit.index.query.Matchable} implementation
+   * of change {@link IndexPredicate}
+   *
+   * <p>This code path requires triggering the condition, when
+   *
+   * <ol>
+   *   <li>The query is rewritten into multiple {@link IndexedChangeQuery} by {@link
+   *       com.google.gerrit.server.index.change.ChangeIndexRewriter#rewrite}
+   *   <li>The changes are returned from the index by the first {@link IndexedChangeQuery}
+   *   <li>Then constrained in {@link com.google.gerrit.index.query.AndSource#match} by applying all
+   *       parsed predicates from the search query
+   *   <li>Thus, the rest of {@link IndexedChangeQuery} work as filters on the index results, see
+   *       {@link IndexedChangeQuery#match}
+   * </ol>
+   *
+   * The constructed query only constrains by the passed searchTerm for the operator that is being
+   * tested (for all changes without a reviewer):
+   *
+   * <ul>
+   *   <li>The search term 'status:new OR status:merged OR status:abandoned' is used to return all
+   *       changes from the search index.
+   *   <li>The non-indexed search term 'reviewerin:"Empty Group"' is only used to make the right AND
+   *       operand work as a filter (not a data source).
+   *   <li>See how it is rewritten in {@link
+   *       com.google.gerrit.server.index.change.ChangeIndexRewriterTest#threeLevelTreeWithMultipleSources}
+   * </ul>
+   *
+   * @param searchTerm change search term that maps to {@link IndexPredicate} and needs to be tested
+   *     as filter
+   * @return a search query that allows to test the {@code searchTerm} as a filter.
+   */
+  protected String makeIndexedPredicateFilterQuery(String searchTerm) throws Exception {
+    String emptyGroupName = "Empty Group";
+    if (gApi.groups().query(emptyGroupName).get().isEmpty()) {
+      createGroup(emptyGroupName, "Administrators");
+    }
+    String queryPattern =
+        "(status:new OR status:merged OR status:abandoned) AND (reviewerin:\"%s\" OR %s)";
+    return String.format(queryPattern, emptyGroupName, searchTerm);
+  }
+
   private void addComment(int changeId, String message, Boolean unresolved) throws Exception {
     ReviewInput input = new ReviewInput();
     ReviewInput.CommentInput comment = new ReviewInput.CommentInput();
diff --git a/lib/nongoogle_test.sh b/lib/nongoogle_test.sh
index df8ee66..8a6c282 100755
--- a/lib/nongoogle_test.sh
+++ b/lib/nongoogle_test.sh
@@ -12,6 +12,7 @@
 
 cat << EOF > $TMP/want
 cglib-3_2
+commons-io
 docker-java-api
 docker-java-transport
 dropwizard-core
@@ -22,6 +23,9 @@
 flogger-log4j-backend
 flogger-system-backend
 guava
+guice-assistedinject
+guice-library-no-aop
+guice-servlet
 httpasyncclient
 httpcore-nio
 j2objc
diff --git a/modules/jgit b/modules/jgit
index 5cd485e..415788d 160000
--- a/modules/jgit
+++ b/modules/jgit
@@ -1 +1 @@
-Subproject commit 5cd485e5dda41d2ef06226a692c64f1aa221eb25
+Subproject commit 415788df28bcfc1788bf17bc12f06d00d822afc2
diff --git a/package.json b/package.json
index 913b7a8..91b8042 100644
--- a/package.json
+++ b/package.json
@@ -3,22 +3,25 @@
   "version": "3.1.0-SNAPSHOT",
   "description": "Gerrit Code Review",
   "dependencies": {
-    "@bazel/rollup": "^2.2.2",
-    "@bazel/terser": "^2.2.2",
-    "@bazel/typescript": "^2.2.2"
+    "@bazel/rollup": "^3.0.0-rc.1",
+    "@bazel/terser": "^3.0.0-rc.1",
+    "@bazel/typescript": "^3.0.0-rc.1"
   },
   "devDependencies": {
-    "eslint": "^6.6.0",
-    "eslint-config-google": "^0.13.0",
-    "eslint-plugin-html": "^6.0.0",
-    "eslint-plugin-import": "^2.20.1",
-    "eslint-plugin-jsdoc": "^19.2.0",
-    "eslint-plugin-prettier": "^3.1.3",
-    "gts": "^2.0.2",
+    "@typescript-eslint/eslint-plugin": "^4.11.0",
+    "eslint": "^7.16.0",
+    "eslint-config-google": "^0.14.0",
+    "eslint-plugin-html": "^6.1.1",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-jsdoc": "^30.7.9",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-prettier": "^3.3.0",
+    "gts": "^3.0.3",
     "polymer-cli": "^1.9.11",
     "prettier": "2.0.5",
+    "rollup": "^2.3.4",
     "terser": "^4.8.0",
-    "typescript": "3.9.5"
+    "typescript": "4.0.5"
   },
   "scripts": {
     "clean": "git clean -fdx && bazel clean --expunge",
diff --git a/plugins/gitiles b/plugins/gitiles
index a33c8b8..b196dd5 160000
--- a/plugins/gitiles
+++ b/plugins/gitiles
@@ -1 +1 @@
-Subproject commit a33c8b8d61b778f8ca84196b1a7cc1fd4fe24946
+Subproject commit b196dd5b6fcfd50518a6625a64cb93424c084620
diff --git a/plugins/replication b/plugins/replication
index 1b822fa..84b9304 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 1b822fa63b04596faa93a13df7fcb8682bccb98b
+Subproject commit 84b93043383fe4296944598739db0a2dfb9b2ee6
diff --git a/plugins/singleusergroup b/plugins/singleusergroup
index 58ee52a..a0c53c6 160000
--- a/plugins/singleusergroup
+++ b/plugins/singleusergroup
@@ -1 +1 @@
-Subproject commit 58ee52a8670e38f30785bfbb648ba27c61c3a202
+Subproject commit a0c53c6c5ad1ba8f8967ed6d2bcb18995f734cad
diff --git a/polygerrit-ui/README.md b/polygerrit-ui/README.md
index c6dd897..302551b 100644
--- a/polygerrit-ui/README.md
+++ b/polygerrit-ui/README.md
@@ -74,6 +74,14 @@
 
 More information for installing and using nodejs rules can be found here https://bazelbuild.github.io/rules_nodejs/install.html
 
+### Upgrade to @bazel-scoped packages
+
+It might be necessary to run this command to upgrade to major `rules_nodejs` release:
+
+```sh
+yarn remove @bazel/...
+```
+
 ## Setup typescript support in the IDE
 
 Modern IDE should automatically handle typescript settings from the 
diff --git a/polygerrit-ui/app/.eslintignore b/polygerrit-ui/app/.eslintignore
index 16ea228..087a049 100644
--- a/polygerrit-ui/app/.eslintignore
+++ b/polygerrit-ui/app/.eslintignore
@@ -1,3 +1,4 @@
 **/node_modules
 **/rollup.config.js
 node_modules_licenses
+!.eslintrc-bazel.js
diff --git a/polygerrit-ui/app/.eslintrc-bazel.js b/polygerrit-ui/app/.eslintrc-bazel.js
index 977eb45..9a51242 100644
--- a/polygerrit-ui/app/.eslintrc-bazel.js
+++ b/polygerrit-ui/app/.eslintrc-bazel.js
@@ -20,7 +20,7 @@
 // for node_modules.
 
 function getBazelSettings() {
-  const runFilesDir = process.env["RUNFILES_DIR"];
+  const runFilesDir = process.env['RUNFILES_DIR'];
   if (!runFilesDir) {
     // eslint is executed with 'bazel run ...' to fix the source code. It runs
     // against real source code, no special paths for node_modules is set.
@@ -28,18 +28,18 @@
   }
   // eslint is executed with 'bazel test...'. Set path to required node_modules
   return {
-    "import/resolver": {
-      "node": {
-        "paths": [
+    'import/resolver': {
+      node: {
+        paths: [
           `${runFilesDir}/ui_npm/node_modules`,
-          `${runFilesDir}/ui_dev_npm/node_modules`
-        ]
-      }
-    }
+          `${runFilesDir}/ui_dev_npm/node_modules`,
+        ],
+      },
+    },
   };
 }
 
 module.exports = {
-  "extends": "./.eslintrc.js",
-  "settings": getBazelSettings(),
+  extends: './.eslintrc.js',
+  settings: getBazelSettings(),
 };
diff --git a/polygerrit-ui/app/.eslintrc.js b/polygerrit-ui/app/.eslintrc.js
index 28bea0b..ba2c40d 100644
--- a/polygerrit-ui/app/.eslintrc.js
+++ b/polygerrit-ui/app/.eslintrc.js
@@ -20,219 +20,224 @@
 const path = require('path');
 
 module.exports = {
-  "extends": ["eslint:recommended", "google"],
-  "parserOptions": {
-    "ecmaVersion": 9,
-    "sourceType": "module"
+  extends: ['eslint:recommended', 'google'],
+  parserOptions: {
+    ecmaVersion: 9,
+    sourceType: 'module',
   },
-  "env": {
-    "browser": true,
-    "es6": true
+  env: {
+    browser: true,
+    es6: true,
   },
-  "rules": {
+  rules: {
     // https://eslint.org/docs/rules/no-confusing-arrow
-    "no-confusing-arrow": "error",
+    'no-confusing-arrow': 'error',
     // https://eslint.org/docs/rules/newline-per-chained-call
-    "newline-per-chained-call": ["error", {"ignoreChainWithDepth": 2}],
+    'newline-per-chained-call': ['error', {ignoreChainWithDepth: 2}],
     // https://eslint.org/docs/rules/arrow-body-style
-    "arrow-body-style": ["error", "as-needed",
-      {"requireReturnForObjectLiteral": true}],
+    'arrow-body-style': ['error', 'as-needed',
+      {requireReturnForObjectLiteral: true}],
     // https://eslint.org/docs/rules/arrow-parens
-    "arrow-parens": ["error", "as-needed"],
+    'arrow-parens': ['error', 'as-needed'],
     // https://eslint.org/docs/rules/block-spacing
-    "block-spacing": ["error", "always"],
+    'block-spacing': ['error', 'always'],
     // https://eslint.org/docs/rules/brace-style
-    "brace-style": ["error", "1tbs", {"allowSingleLine": true}],
+    'brace-style': ['error', '1tbs', {allowSingleLine: true}],
     // https://eslint.org/docs/rules/camelcase
-    "camelcase": "off",
+    'camelcase': 'off',
     // https://eslint.org/docs/rules/comma-dangle
-    "comma-dangle": ["error", {
-      "arrays": "always-multiline",
-      "objects": "always-multiline",
-      "imports": "always-multiline",
-      "exports": "always-multiline",
-      "functions": "never"
+    'comma-dangle': ['error', {
+      arrays: 'always-multiline',
+      objects: 'always-multiline',
+      imports: 'always-multiline',
+      exports: 'always-multiline',
+      functions: 'never',
     }],
     // https://eslint.org/docs/rules/eol-last
-    "eol-last": "off",
+    'eol-last': 'off',
     // https://eslint.org/docs/rules/indent
-    "indent": ["error", 2, {
-      "MemberExpression": 2,
-      "FunctionDeclaration": {"body": 1, "parameters": 2},
-      "FunctionExpression": {"body": 1, "parameters": 2},
-      "CallExpression": {"arguments": 2},
-      "ArrayExpression": 1,
-      "ObjectExpression": 1,
-      "SwitchCase": 1
+    'indent': ['error', 2, {
+      MemberExpression: 2,
+      FunctionDeclaration: {body: 1, parameters: 2},
+      FunctionExpression: {body: 1, parameters: 2},
+      CallExpression: {arguments: 2},
+      ArrayExpression: 1,
+      ObjectExpression: 1,
+      SwitchCase: 1,
     }],
     // https://eslint.org/docs/rules/keyword-spacing
-    "keyword-spacing": ["error", {"after": true, "before": true}],
+    'keyword-spacing': ['error', {after: true, before: true}],
     // https://eslint.org/docs/rules/lines-between-class-members
-    "lines-between-class-members": ["error", "always"],
+    'lines-between-class-members': ['error', 'always'],
     // https://eslint.org/docs/rules/max-len
-    "max-len": [
-      "error",
+    'max-len': [
+      'error',
       80,
       2,
       {
-        "ignoreComments": true,
-        "ignorePattern": "^import .*;$"
-      }
+        ignoreComments: true,
+        ignorePattern: '^import .*;$',
+      },
     ],
     // https://eslint.org/docs/rules/new-cap
-    "new-cap": ["error", {
-      "capIsNewExceptions": ["Polymer", "GestureEventListeners"],
-      "capIsNewExceptionPattern": "^.*Mixin$"
+    'new-cap': ['error', {
+      capIsNewExceptions: ['Polymer', 'GestureEventListeners'],
+      capIsNewExceptionPattern: '^.*Mixin$',
     }],
     // https://eslint.org/docs/rules/no-console
-    "no-console": ["error", { allow: ["warn", "error", "info", "assert", "group", "groupEnd"] }],
+    'no-console': [
+      'error',
+      {allow: ['warn', 'error', 'info', 'assert', 'group', 'groupEnd']},
+    ],
     // https://eslint.org/docs/rules/no-multiple-empty-lines
-    "no-multiple-empty-lines": ["error", {"max": 1}],
+    'no-multiple-empty-lines': ['error', {max: 1}],
     // https://eslint.org/docs/rules/no-prototype-builtins
-    "no-prototype-builtins": "off",
+    'no-prototype-builtins': 'off',
     // https://eslint.org/docs/rules/no-redeclare
-    "no-redeclare": "off",
+    'no-redeclare': 'off',
     // https://eslint.org/docs/rules/no-trailing-spaces
-    "no-trailing-spaces": "error",
+    'no-trailing-spaces': 'error',
     // https://eslint.org/docs/rules/no-irregular-whitespace
-    "no-irregular-whitespace": "error",
+    'no-irregular-whitespace': 'error',
     // https://eslint.org/docs/rules/array-callback-return
-    "array-callback-return": ['error', { allowImplicit: true }],
+    'array-callback-return': ['error', {allowImplicit: true}],
     // https://eslint.org/docs/rules/no-restricted-syntax
-    "no-restricted-syntax": [
-      "error",
+    'no-restricted-syntax': [
+      'error',
       {
-        "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='test'][property.name='only']",
-        "message": "Remove test.only."
+        selector: 'ExpressionStatement > CallExpression > ' +
+            'MemberExpression[object.name=\'test\'][property.name=\'only\']',
+        message: 'Remove test.only.',
       },
       {
-        "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='suite'][property.name='only']",
-        "message": "Remove suite.only."
-      }
+        selector: 'ExpressionStatement > CallExpression > ' +
+            'MemberExpression[object.name=\'suite\'][property.name=\'only\']',
+        message: 'Remove suite.only.',
+      },
     ],
     // no-undef disables global variable.
     // "globals" declares allowed global variables.
     // https://eslint.org/docs/rules/no-undef
-    "no-undef": ["error"],
+    'no-undef': ['error'],
     // https://eslint.org/docs/rules/no-useless-escape
-    "no-useless-escape": "off",
+    'no-useless-escape': 'off',
     // https://eslint.org/docs/rules/no-var
-    "no-var": "error",
+    'no-var': 'error',
     // https://eslint.org/docs/rules/operator-linebreak
-    "operator-linebreak": "off",
+    'operator-linebreak': 'off',
     // https://eslint.org/docs/rules/object-shorthand
-    "object-shorthand": ["error", "always"],
+    'object-shorthand': ['error', 'always'],
     // https://eslint.org/docs/rules/padding-line-between-statements
-    "padding-line-between-statements": [
-      "error",
+    'padding-line-between-statements': [
+      'error',
       {
-        "blankLine": "always",
-        "prev": "class",
-        "next": "*"
+        blankLine: 'always',
+        prev: 'class',
+        next: '*',
       },
       {
-        "blankLine": "always",
-        "prev": "*",
-        "next": "class"
-      }
+        blankLine: 'always',
+        prev: '*',
+        next: 'class',
+      },
     ],
     // https://eslint.org/docs/rules/prefer-arrow-callback
-    "prefer-arrow-callback": "error",
+    'prefer-arrow-callback': 'error',
     // https://eslint.org/docs/rules/prefer-const
-    "prefer-const": "error",
+    'prefer-const': 'error',
     // https://eslint.org/docs/rules/prefer-promise-reject-errors
-    "prefer-promise-reject-errors": "error",
+    'prefer-promise-reject-errors': 'error',
     // https://eslint.org/docs/rules/prefer-spread
-    "prefer-spread": "error",
+    'prefer-spread': 'error',
     // https://eslint.org/docs/rules/prefer-object-spread
-    "prefer-object-spread": "error",
+    'prefer-object-spread': 'error',
     // https://eslint.org/docs/rules/quote-props
-    "quote-props": ["error", "consistent-as-needed"],
+    'quote-props': ['error', 'consistent-as-needed'],
     // https://eslint.org/docs/rules/semi
-    "semi": ["error", "always"],
+    'semi': ['error', 'always'],
     // https://eslint.org/docs/rules/template-curly-spacing
-    "template-curly-spacing": "error",
+    'template-curly-spacing': 'error',
 
     // https://eslint.org/docs/rules/require-jsdoc
-    "require-jsdoc": 0,
+    'require-jsdoc': 0,
     // https://eslint.org/docs/rules/valid-jsdoc
-    "valid-jsdoc": 0,
+    'valid-jsdoc': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-alignment
-    "jsdoc/check-alignment": 2,
+    'jsdoc/check-alignment': 2,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-examples
-    "jsdoc/check-examples": 0,
+    'jsdoc/check-examples': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-indentation
-    "jsdoc/check-indentation": 0,
+    'jsdoc/check-indentation': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-param-names
-    "jsdoc/check-param-names": 0,
+    'jsdoc/check-param-names': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-syntax
-    "jsdoc/check-syntax": 0,
+    'jsdoc/check-syntax': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-tag-names
-    "jsdoc/check-tag-names": 0,
+    'jsdoc/check-tag-names': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-check-types
-    "jsdoc/check-types": 0,
+    'jsdoc/check-types': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-implements-on-classes
-    "jsdoc/implements-on-classes": 2,
+    'jsdoc/implements-on-classes': 2,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-match-description
-    "jsdoc/match-description": 0,
+    'jsdoc/match-description': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-newline-after-description
-    "jsdoc/newline-after-description": 2,
+    'jsdoc/newline-after-description': 2,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-no-types
-    "jsdoc/no-types": 0,
+    'jsdoc/no-types': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-no-undefined-types
-    "jsdoc/no-undefined-types": 0,
+    'jsdoc/no-undefined-types': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-description
-    "jsdoc/require-description": 0,
+    'jsdoc/require-description': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-description-complete-sentence
-    "jsdoc/require-description-complete-sentence": 0,
+    'jsdoc/require-description-complete-sentence': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-example
-    "jsdoc/require-example": 0,
+    'jsdoc/require-example': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-hyphen-before-param-description
-    "jsdoc/require-hyphen-before-param-description": 0,
+    'jsdoc/require-hyphen-before-param-description': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-jsdoc
-    "jsdoc/require-jsdoc": 0,
+    'jsdoc/require-jsdoc': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-param
-    "jsdoc/require-param": 0,
+    'jsdoc/require-param': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-param-description
-    "jsdoc/require-param-description": 0,
+    'jsdoc/require-param-description': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-param-name
-    "jsdoc/require-param-name": 2,
+    'jsdoc/require-param-name': 2,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-returns
-    "jsdoc/require-returns": 0,
+    'jsdoc/require-returns': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-returns-check
-    "jsdoc/require-returns-check": 0,
+    'jsdoc/require-returns-check': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-returns-description
-    "jsdoc/require-returns-description": 0,
+    'jsdoc/require-returns-description': 0,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-valid-types
-    "jsdoc/valid-types": 2,
+    'jsdoc/valid-types': 2,
     // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-file-overview
-    "jsdoc/require-file-overview": ["error", {
-      "tags": {
-        "license": {
-          "mustExist": true,
-          "preventDuplicates": true
-        }
-      }
+    'jsdoc/require-file-overview': ['error', {
+      tags: {
+        license: {
+          mustExist: true,
+          preventDuplicates: true,
+        },
+      },
     }],
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-self-import.md
-    "import/no-self-import": 2,
+    'import/no-self-import': 2,
     // The no-cycle rule is slow, because it doesn't cache dependencies.
     // Disable it.
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-cycle.md
-    "import/no-cycle": 0,
+    'import/no-cycle': 0,
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-useless-path-segments.md
-    "import/no-useless-path-segments": 2,
+    'import/no-useless-path-segments': 2,
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-unused-modules.md
-    "import/no-unused-modules": 2,
+    'import/no-unused-modules': 2,
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-default-export.md
-    "import/no-default-export": 2,
+    'import/no-default-export': 2,
     // Prevents certain identifiers being used.
     // Prefer flush() over flushAsynchronousOperations().
-    "id-blacklist": ["error", "flushAsynchronousOperations"],
+    'id-blacklist': ['error', 'flushAsynchronousOperations'],
   },
 
   // List of allowed globals in all files
-  "globals": {
+  globals: {
     // Polygerrit global variables.
     // You must not add anything new in this list!
     // Instead export variables from modules
@@ -240,156 +245,166 @@
     // Global variables from 3rd party libraries.
     // You should not add anything in this list, always try to import
     // If import is not possible - you can extend this list
-    "ShadyCSS": "readonly",
-    "linkify": "readonly",
-    "security": "readonly",
+    ShadyCSS: 'readonly',
+    linkify: 'readonly',
+    security: 'readonly',
   },
-  "overrides": [
+  overrides: [
     {
-      // .js-only rules
-      "files": ["**/*.js"],
-      "rules": {
-        // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-param-type
-        "jsdoc/require-param-type": 2,
-        // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-returns-type
-        "jsdoc/require-returns-type": 2,
-        // The rule is required for .js files only, because typescript compiler
-        // always checks import.
-        "import/no-unresolved": 2,
-        "import/named": 2,
+      files: ['.eslintrc.js', '.eslintrc-bazel.js'],
+      env: {
+        browser: false,
+        es6: true,
+        node: true,
       },
-      "globals": {
-        "goog": "readonly",
-      }
     },
     {
-      "files": ["**/*.ts"],
-      "extends": [require.resolve("gts/.eslintrc.json")],
-      "rules": {
-        "no-restricted-imports": ["error", {
-          name: "@polymer/decorators/lib/decorators",
-          message: "Use @polymer/decorators instead",
+      // .js-only rules
+      files: ['**/*.js'],
+      rules: {
+        // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-param-type
+        'jsdoc/require-param-type': 2,
+        // https://github.com/gajus/eslint-plugin-jsdoc#eslint-plugin-jsdoc-rules-require-returns-type
+        'jsdoc/require-returns-type': 2,
+        // The rule is required for .js files only, because typescript compiler
+        // always checks import.
+        'import/no-unresolved': 2,
+        'import/named': 2,
+      },
+      globals: {
+        goog: 'readonly',
+      },
+    },
+    {
+      files: ['**/*.ts'],
+      extends: [require.resolve('gts/.eslintrc.json')],
+      rules: {
+        'no-restricted-imports': ['error', {
+          name: '@polymer/decorators/lib/decorators',
+          message: 'Use @polymer/decorators instead',
         }],
-        "@typescript-eslint/no-explicit-any": "error",
+        '@typescript-eslint/no-explicit-any': 'error',
         // The following rules is required to match internal google rules
-        "@typescript-eslint/restrict-plus-operands": "error",
-        "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
+        '@typescript-eslint/restrict-plus-operands': 'error',
+        '@typescript-eslint/no-unused-vars': [
+          'error',
+          {argsIgnorePattern: '^_'},
+        ],
         // https://github.com/mysticatea/eslint-plugin-node/blob/master/docs/rules/no-unsupported-features/node-builtins.md
-        "node/no-unsupported-features/node-builtins": "off",
+        'node/no-unsupported-features/node-builtins': 'off',
         // Disable no-invalid-this for ts files, because it incorrectly reports
         // errors in some cases (see https://github.com/typescript-eslint/typescript-eslint/issues/491)
         // At the same time, we are using typescript in a strict mode and
         // it catches almost all errors related to invalid usage of this.
-        "no-invalid-this": "off",
+        'no-invalid-this': 'off',
 
-        "node/no-extraneous-import": "off",
+        'node/no-extraneous-import': 'off',
 
         // Typescript already checks for undef
-        "no-undef": "off",
+        'no-undef': 'off',
 
-        "jsdoc/no-types": 2,
+        'jsdoc/no-types': 2,
       },
-      "parserOptions": {
-        "project": path.resolve(__dirname, "./tsconfig_eslint.json"),
-      }
-    },
-    {
-      "files": ["*_test.ts"],
-      "rules": {
-        "@typescript-eslint/no-explicit-any": "off"
+      parserOptions: {
+        project: path.resolve(__dirname, './tsconfig_eslint.json'),
       },
     },
     {
-      "files": ["*.html", "test.js", "test-infra.js"],
-      "rules": {
-        "jsdoc/require-file-overview": "off"
+      files: ['*_test.ts'],
+      rules: {
+        '@typescript-eslint/no-explicit-any': 'off',
       },
     },
     {
-      "files": [
-        "*.html",
-        "*_test.js",
-        "a11y-test-utils.js",
+      files: ['*.html', 'test.js', 'test-infra.js'],
+      rules: {
+        'jsdoc/require-file-overview': 'off',
+      },
+    },
+    {
+      files: [
+        '*.html',
+        '*_test.js',
+        'a11y-test-utils.js',
       ],
       // Additional global variables allowed in tests
-      "globals": {
+      globals: {
         // Global variables from 3rd party test libraries/frameworks.
         // You can extend this list if you want to use other global
         // variables from these libraries and import is not possible
-        "MockInteractions": "readonly",
-        "_": "readonly",
-        "axs": "readonly",
-        "a11ySuite": "readonly",
-        "assert": "readonly",
-        "expect": "readonly",
-        "fixture": "readonly",
-        "flush": "readonly",
-        "flushAsynchronousOperations": "readonly",
-        "setup": "readonly",
-        "sinon": "readonly",
-        "stub": "readonly",
-        "suite": "readonly",
-        "suiteSetup": "readonly",
-        "suiteTeardown": "readonly",
-        "teardown": "readonly",
-        "test": "readonly",
-        "fixtureFromElement": "readonly",
-        "fixtureFromTemplate": "readonly",
-      }
+        MockInteractions: 'readonly',
+        _: 'readonly',
+        axs: 'readonly',
+        a11ySuite: 'readonly',
+        assert: 'readonly',
+        expect: 'readonly',
+        fixture: 'readonly',
+        flush: 'readonly',
+        setup: 'readonly',
+        sinon: 'readonly',
+        stub: 'readonly',
+        suite: 'readonly',
+        suiteSetup: 'readonly',
+        suiteTeardown: 'readonly',
+        teardown: 'readonly',
+        test: 'readonly',
+        fixtureFromElement: 'readonly',
+        fixtureFromTemplate: 'readonly',
+      },
     },
     {
-      "files": "import-href.js",
-      "globals": {
-        "HTMLImports": "readonly",
-      }
+      files: 'import-href.js',
+      globals: {
+        HTMLImports: 'readonly',
+      },
     },
     {
-      "files": ["samples/**/*.js"],
-      "globals": {
+      files: ['samples/**/*.js'],
+      globals: {
         // Settings for samples. You can add globals here if you want to use it
-        "Gerrit": "readonly",
-        "Polymer": "readonly",
-      }
+        Gerrit: 'readonly',
+        Polymer: 'readonly',
+      },
     },
     {
-      "files": ["test/functional/**/*.js"],
+      files: ['test/functional/**/*.js'],
       // Settings for functional tests. These scripts are node scripts.
       // Turn off "no-undef" to allow any global variable
-      "env": {
-        "browser": false,
-        "node": true,
-        "es6": false
+      env: {
+        browser: false,
+        node: true,
+        es6: false,
       },
-      "rules": {
-        "no-undef": "off",
-      }
+      rules: {
+        'no-undef': 'off',
+      },
     },
     {
-      "files": ["*_html.js", "gr-icons.js", "*-theme.js", "*-styles.js"],
-      "rules": {
-        "max-len": "off"
-      }
+      files: ['*_html.js', 'gr-icons.js', '*-theme.js', '*-styles.js'],
+      rules: {
+        'max-len': 'off',
+      },
     },
     {
-      "files": ["*_html.js"],
-      "rules": {
-        "prettier/prettier": ["error", {
-          "bracketSpacing": false,
-          "singleQuote": true,
-        }]
-      }
-    }
+      files: ['*_html.js'],
+      rules: {
+        'prettier/prettier': ['error', {
+          bracketSpacing: false,
+          singleQuote: true,
+        }],
+      },
+    },
   ],
-  "plugins": [
-    "html",
-    "jsdoc",
-    "import",
-    "prettier"
+  plugins: [
+    'html',
+    'jsdoc',
+    'import',
+    'prettier',
   ],
-  "settings": {
-    "html/report-bad-indent": "error",
-    "import/resolver": {
-      "node": {},
+  settings: {
+    'html/report-bad-indent': 'error',
+    'import/resolver': {
+      node: {},
       [path.resolve(__dirname, './.eslint-ts-resolver.js')]: {},
     },
   },
diff --git a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts
index 3c155f85..cbb3d95 100644
--- a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts
+++ b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.ts
@@ -19,7 +19,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-icons/gr-icons';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-permission/gr-permission';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
@@ -43,6 +42,7 @@
   LabelNameToLabelTypeInfoMap,
 } from '../../../types/common';
 import {PolymerDomRepeatEvent} from '../../../types/types';
+import {fireEvent} from '../../../utils/event-util';
 
 /**
  * Fired when the section has been modified or removed.
@@ -141,9 +141,7 @@
       // For a new section, this is not fired because new permissions and
       // rules have to be added in order to save, modifying the ref is not
       // enough.
-      this.dispatchEvent(
-        new CustomEvent('access-modified', {bubbles: true, composed: true})
-      );
+      fireEvent(this, 'access-modified');
     }
     this.section.value.updatedId = this.section.id;
   }
@@ -276,18 +274,11 @@
       return;
     }
     if (this.section.value.added) {
-      this.dispatchEvent(
-        new CustomEvent('added-section-removed', {
-          bubbles: true,
-          composed: true,
-        })
-      );
+      fireEvent(this, 'added-section-removed');
     }
     this._deleted = true;
     this.section.value.deleted = true;
-    this.dispatchEvent(
-      new CustomEvent('access-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'access-modified');
   }
 
   _handleUndoRemove() {
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
index 1b377dc..2c66a3e 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.ts
@@ -20,7 +20,6 @@
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-list-view/gr-list-view';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-create-group-dialog/gr-create-group-dialog';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts
index 8fe23e8..2a607a7 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.ts
@@ -21,7 +21,6 @@
 import '../../shared/gr-icons/gr-icons';
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
 import '../../shared/gr-page-nav/gr-page-nav';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-admin-group-list/gr-admin-group-list';
 import '../gr-group/gr-group';
 import '../gr-group-audit-log/gr-group-audit-log';
@@ -40,7 +39,6 @@
 import {getBaseUrl} from '../../../utils/url-util';
 import {
   GerritNav,
-  GerritView,
   GroupDetailView,
   RepoDetailView,
 } from '../../core/gr-navigation/gr-navigation';
@@ -67,6 +65,7 @@
 import {ValueChangeDetail} from '../../shared/gr-dropdown-list/gr-dropdown-list';
 import {GrJsApiInterface} from '../../shared/gr-js-api-interface/gr-js-api-interface-element';
 import {appContext} from '../../../services/app-context';
+import {GerritView} from '../../../services/router/router-model';
 
 const INTERNAL_GROUP_REGEX = /^[\da-f]{40}$/;
 
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_test.js b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_test.js
index 15211cf..cac409d 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_test.js
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_test.js
@@ -18,9 +18,10 @@
 import '../../../test/common-test-setup-karma.js';
 import './gr-admin-view.js';
 import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
-import {GerritNav, GerritView} from '../../core/gr-navigation/gr-navigation.js';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader.js';
 import {stubBaseUrl} from '../../../test/test-utils.js';
+import {GerritView} from '../../../services/router/router-model.js';
 
 const basicFixture = fixtureFromElement('gr-admin-view');
 
diff --git a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts
index 8a64cb8..0b1e27e 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.ts
@@ -19,7 +19,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
index 338494b..5902717 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts
index 10f5296..d50d7c5 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.ts
@@ -18,7 +18,6 @@
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
index 83a42e5..d3ce98a 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
+++ b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.ts
@@ -19,7 +19,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts
index f17f25f..536c5c3 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.ts
@@ -18,7 +18,6 @@
 import '../../../styles/gr-table-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-date-formatter/gr-date-formatter';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-account-link/gr-account-link';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts
index 4c22597..b152e3c 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.ts
@@ -23,7 +23,6 @@
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts b/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
index ce8ad9c..f5170ed 100644
--- a/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
+++ b/polygerrit-ui/app/elements/admin/gr-group/gr-group.ts
@@ -21,7 +21,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-copy-clipboard/gr-copy-clipboard';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
@@ -35,7 +34,11 @@
 import {GroupId, GroupInfo, GroupName} from '../../../types/common';
 import {ErrorCallback} from '../../../services/services/gr-rest-api/gr-rest-api';
 import {hasOwnProperty} from '../../../utils/common-util';
-import {firePageError, fireTitleChange} from '../../../utils/event-util';
+import {
+  fireEvent,
+  firePageError,
+  fireTitleChange,
+} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
 
 const INTERNAL_GROUP_REGEX = /^[\da-f]{40}$/;
@@ -210,6 +213,7 @@
             name: groupName,
             external: !this._groupIsInternal,
           };
+          fireEvent(this, 'name-changed');
           this.dispatchEvent(
             new CustomEvent('name-changed', {
               detail,
diff --git a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
index e81543c..65a3b00 100644
--- a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
+++ b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
@@ -21,7 +21,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-rule-editor/gr-rule-editor';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
@@ -56,6 +55,7 @@
 } from '../gr-repo-access/gr-repo-access-interfaces';
 import {PolymerDomRepeatEvent} from '../../../types/types';
 import {appContext} from '../../../services/app-context';
+import {fireEvent} from '../../../utils/event-util';
 
 const MAX_AUTOCOMPLETE_RESULTS = 20;
 
@@ -223,9 +223,7 @@
     }
     this.permission.value.modified = true;
     // Allows overall access page to know a change has been made.
-    this.dispatchEvent(
-      new CustomEvent('access-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'access-modified');
   }
 
   _handleRemovePermission() {
@@ -233,18 +231,11 @@
       return;
     }
     if (this.permission.value.added) {
-      this.dispatchEvent(
-        new CustomEvent('added-permission-removed', {
-          bubbles: true,
-          composed: true,
-        })
-      );
+      fireEvent(this, 'added-permission-removed');
     }
     this._deleted = true;
     this.permission.value.deleted = true;
-    this.dispatchEvent(
-      new CustomEvent('access-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'access-modified');
   }
 
   @observe('_rules.splices')
@@ -408,9 +399,7 @@
     value.added = true;
     // See comment above for why we cannot use "this.set(...)" here.
     this.permission.value.rules[groupId] = value;
-    this.dispatchEvent(
-      new CustomEvent('access-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'access-modified');
   }
 
   _computeHasRange(name: string) {
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
index 03f0eff..fe3d9ff 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.ts
@@ -17,7 +17,6 @@
 import '../../../styles/gr-table-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-list-view/gr-list-view';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts
index 79ee2c8..b46a905 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.ts
@@ -17,7 +17,6 @@
 import '../../../styles/gr-menu-page-styles';
 import '../../../styles/gr-subpage-styles';
 import '../../../styles/shared-styles';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-access-section/gr-access-section';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
index c57c52f..0145b9f 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
@@ -22,7 +22,6 @@
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-create-change-dialog/gr-create-change-dialog';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
@@ -129,6 +128,7 @@
   }
 
   _handleRunningGC() {
+    if (!this.repo) return;
     this._runningGC = true;
     return this.restApiService
       .runRepoGC(this.repo)
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts
index fd10a63..e72170b 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.ts
@@ -16,7 +16,6 @@
  */
 
 import '../../../styles/shared-styles';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {flush} 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';
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
index 168596a..644e9b1 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.ts
@@ -25,7 +25,6 @@
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-list-view/gr-list-view';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-create-pointer-dialog/gr-create-pointer-dialog';
 import '../gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
index 4d6fcd04..6f6f926 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.ts
@@ -19,7 +19,6 @@
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-list-view/gr-list-view';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-create-repo-dialog/gr-create-repo-dialog';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
index acde142..d8481ad 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.ts
@@ -19,7 +19,6 @@
 import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import '../../shared/gr-download-commands/gr-download-commands';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import '../../../styles/gr-form-styles';
 import '../../../styles/gr-subpage-styles';
diff --git a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.ts b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.ts
index 8843933..13d0e50 100644
--- a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.ts
+++ b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.ts
@@ -19,7 +19,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-select/gr-select';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
@@ -27,6 +26,7 @@
 import {encodeURL, getBaseUrl} from '../../../utils/url-util';
 import {AccessPermissionId} from '../../../utils/access-util';
 import {property, customElement, observe} from '@polymer/decorators';
+import {fireEvent} from '../../../utils/event-util';
 
 /**
  * Fired when the rule has been modified or removed.
@@ -268,15 +268,11 @@
   _handleRemoveRule() {
     if (!this.rule) return;
     if (this.rule.value.added) {
-      this.dispatchEvent(
-        new CustomEvent('added-rule-removed', {bubbles: true, composed: true})
-      );
+      fireEvent(this, 'added-rule-removed');
     }
     this._deleted = true;
     this.rule.value.deleted = true;
-    this.dispatchEvent(
-      new CustomEvent('access-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'access-modified');
   }
 
   _handleUndoRemove() {
@@ -305,9 +301,7 @@
     }
     this.rule.value.modified = true;
     // Allows overall access page to know a change has been made.
-    this.dispatchEvent(
-      new CustomEvent('access-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'access-modified');
   }
 
   _setOriginalRuleValues(value: RuleValue) {
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts
index 64342f4..558037d 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.ts
@@ -49,6 +49,7 @@
   Timestamp,
 } from '../../../types/common';
 import {hasOwnProperty} from '../../../utils/common-util';
+import {pluralize} from '../../../utils/string-util';
 
 enum ChangeSize {
   XS = 10,
@@ -155,8 +156,7 @@
     const titleParts: string[] = [];
     if (category === LabelCategory.UNRESOLVED_COMMENTS) {
       const num = change?.unresolved_comment_count ?? 0;
-      const plural = num > 1 ? 's' : '';
-      titleParts.push(`${num} unresolved comment${plural}`);
+      titleParts.push(pluralize(num, 'unresolved comment'));
     }
     const significantLabel =
       label.rejected || label.approved || label.disliked || label.recommended;
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
index 1484e6e..973ccc8 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
@@ -16,7 +16,6 @@
  */
 
 import '../../shared/gr-icons/gr-icons';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-change-list/gr-change-list';
 import '../gr-repo-header/gr-repo-header';
 import '../gr-user-header/gr-user-header';
@@ -26,7 +25,7 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-change-list-view_html';
 import {page} from '../../../utils/page-wrapper-utils';
-import {GerritNav, GerritView} from '../../core/gr-navigation/gr-navigation';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {customElement, property} from '@polymer/decorators';
 import {AppElementParams} from '../../gr-app-types';
 import {
@@ -42,6 +41,7 @@
 import {ChangeListViewState} from '../../../types/types';
 import {fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {GerritView} from '../../../services/router/router-model';
 
 const LookupQueryPatterns = {
   CHANGE_ID: /^\s*i?[0-9a-f]{7,40}\s*$/i,
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts
index 3639657..c45e801 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.ts
@@ -17,7 +17,6 @@
 
 import '../../../styles/gr-change-list-styles';
 import '../../shared/gr-cursor-manager/gr-cursor-manager';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-change-list-item/gr-change-list-item';
 import '../../../styles/shared-styles';
 import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
@@ -55,6 +54,7 @@
   isAttentionSetEnabled,
 } from '../../../utils/attention-set-util';
 import {CustomKeyboardEvent} from '../../../types/events';
+import {fireEvent} from '../../../utils/event-util';
 
 const NUMBER_FIXED_COLUMNS = 3;
 const CLOSED_STATUS = ['MERGED', 'ABANDONED'];
@@ -227,7 +227,9 @@
         preferences && preferences.legacycid_in_change_table
       );
       if (preferences.change_table && preferences.change_table.length > 0) {
-        const prefColumns = this.getVisibleColumns(preferences.change_table);
+        const prefColumns = this.renameProjectToRepoColumn(
+          preferences.change_table
+        );
         this.visibleChangeTableColumns = this.getEnabledColumns(
           prefColumns,
           config,
@@ -424,12 +426,7 @@
     }
 
     e.preventDefault();
-    this.dispatchEvent(
-      new CustomEvent('next-page', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'next-page');
   }
 
   _prevPage(e: CustomKeyboardEvent) {
diff --git a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.ts b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.ts
index 35f3aeb..f320296 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.ts
@@ -23,6 +23,7 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {customElement} from '@polymer/decorators';
 import {htmlTemplate} from './gr-create-change-help_html';
+import {fireEvent} from '../../../utils/event-util';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -43,8 +44,6 @@
    */
   _handleCreateTap(e: Event) {
     e.preventDefault();
-    this.dispatchEvent(
-      new CustomEvent('create-tap', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'create-tap');
   }
 }
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
index 5fc831a..0a87503 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
@@ -19,7 +19,6 @@
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-create-commands-dialog/gr-create-commands-dialog';
 import '../gr-create-change-help/gr-create-change-help';
 import '../gr-create-destination-dialog/gr-create-destination-dialog';
@@ -30,7 +29,6 @@
 import {htmlTemplate} from './gr-dashboard-view_html';
 import {
   GerritNav,
-  GerritView,
   UserDashboard,
   YOUR_TURN,
 } from '../../core/gr-navigation/gr-navigation';
@@ -58,6 +56,7 @@
 import {ChangeStarToggleStarDetail} from '../../shared/gr-change-star/gr-change-star';
 import {DashboardViewState} from '../../../types/types';
 import {firePageError, fireTitleChange} from '../../../utils/event-util';
+import {GerritView} from '../../../services/router/router-model';
 
 const PROJECT_PLACEHOLDER_PATTERN = /\$\{project\}/g;
 
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js
index 1fa24ba..1f5d519 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_test.js
@@ -18,7 +18,8 @@
 import '../../../test/common-test-setup-karma.js';
 import './gr-dashboard-view.js';
 import {isHidden} from '../../../test/test-utils.js';
-import {GerritNav, GerritView} from '../../core/gr-navigation/gr-navigation.js';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
+import {GerritView} from '../../../services/router/router-model.js';
 import {changeIsOpen} from '../../../utils/change-util.js';
 import {ChangeStatus} from '../../../constants/constants.js';
 import {createAccountWithId} from '../../../test/test-data-generators.js';
diff --git a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts
index e501cfd..35a2a7f 100644
--- a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.ts
@@ -18,7 +18,6 @@
 import '../../../styles/dashboard-header-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-date-formatter/gr-date-formatter';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts
index b4a1466..10f65a5 100644
--- a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.ts
@@ -20,7 +20,6 @@
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import '../../shared/gr-avatar/gr-avatar';
 import '../../shared/gr-date-formatter/gr-date-formatter';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/dashboard-header-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
index 020762c..febf18a 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
@@ -21,7 +21,6 @@
 import '../../shared/gr-icons/gr-icons';
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-confirm-abandon-dialog/gr-confirm-abandon-dialog';
 import '../gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog';
 import '../gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog';
@@ -46,6 +45,7 @@
 } from '../../../utils/patch-set-util';
 import {
   changeIsOpen,
+  isOwner,
   ListChangesOption,
   listChangesOptionsToHex,
 } from '../../../utils/change-util';
@@ -67,6 +67,7 @@
   ErrorCallback,
 } from '../../../services/services/gr-rest-api/gr-rest-api';
 import {
+  AccountInfo,
   ActionInfo,
   ActionNameToActionInfoMap,
   BranchName,
@@ -114,7 +115,11 @@
   UIActionInfo,
 } from '../../shared/gr-js-api-interface/gr-change-actions-js-api';
 import {fireAlert} from '../../../utils/event-util';
-import {CODE_REVIEW} from '../../../utils/label-util';
+import {
+  CODE_REVIEW,
+  getApprovalInfo,
+  getVotingRange,
+} from '../../../utils/label-util';
 
 const ERR_BRANCH_EMPTY = 'The destination branch can’t be empty.';
 const ERR_COMMIT_EMPTY = 'The commit message can’t be empty.';
@@ -403,6 +408,9 @@
   @property({type: Boolean})
   _hideQuickApproveAction = false;
 
+  @property({type: Object})
+  account?: AccountInfo;
+
   @property({type: String})
   changeNum?: NumericChangeId;
 
@@ -926,6 +934,9 @@
     if (!this.change || !this.change.labels || !this.change.permitted_labels) {
       return null;
     }
+    if (this.change && this.change.status === ChangeStatus.MERGED) {
+      return null;
+    }
     let result;
     for (const label in this.change.labels) {
       if (!(label in this.change.permitted_labels)) {
@@ -950,29 +961,38 @@
       }
     }
     // Allow the user to use quick approve to vote the max score on code review
-    // even if it is already granted.
+    // even if it is already granted by someone else. Does not apply if the
+    // user owns the change or has already granted the max score themselves.
+    const codeReviewLabel = this.change.labels[CODE_REVIEW];
+    const codeReviewPermittedValues = this.change.permitted_labels[CODE_REVIEW];
     if (
       !result &&
-      this.change.labels[CODE_REVIEW] &&
-      this._getLabelStatus(this.change.labels[CODE_REVIEW]) ===
-        LabelStatus.OK &&
-      this.change.permitted_labels[CODE_REVIEW]
+      codeReviewLabel &&
+      codeReviewPermittedValues &&
+      this.account?._account_id &&
+      isDetailedLabelInfo(codeReviewLabel) &&
+      this._getLabelStatus(codeReviewLabel) === LabelStatus.OK &&
+      !isOwner(this.change, this.account) &&
+      getApprovalInfo(codeReviewLabel, this.account)?.value !==
+        getVotingRange(codeReviewLabel)?.max
     ) {
       result = CODE_REVIEW;
     }
 
     if (result) {
-      const score = this.change.permitted_labels[result].slice(-1)[0];
       const labelInfo = this.change.labels[result];
       if (!isDetailedLabelInfo(labelInfo)) {
         return null;
       }
-      const maxScore = Object.keys(labelInfo.values).slice(-1)[0];
-      if (score === maxScore) {
+      const permittedValues = this.change.permitted_labels[result];
+      const usersMaxPermittedScore =
+        permittedValues[permittedValues.length - 1];
+      const maxScoreForLabel = getVotingRange(labelInfo)?.max;
+      if (Number(usersMaxPermittedScore) === maxScoreForLabel) {
         // Allow quick approve only for maximal score.
         return {
           label: result,
-          score,
+          score: usersMaxPermittedScore,
         };
       }
     }
@@ -1150,7 +1170,7 @@
     revert dialog after revert button is pressed. */
     this.restApiService.getChanges(0, query).then(changes => {
       if (!changes) {
-        console.error('changes is undefined');
+        this.reporting.error(new Error('changes is undefined'));
         return;
       }
       this.$.confirmRevertDialog.populate(change, this.commitMessage, changes);
@@ -1164,7 +1184,7 @@
     const query = `submissionid:${change.submission_id}`;
     this.restApiService.getChanges(0, query).then(changes => {
       if (!changes) {
-        console.error('changes is undefined');
+        this.reporting.error(new Error('changes is undefined'));
         return;
       }
       this.$.confirmRevertSubmissionDialog._populateRevertSubmissionMessage(
@@ -1442,7 +1462,7 @@
         );
         break;
       default:
-        console.error('invalid revert type');
+        this.reporting.error(new Error('invalid revert type'));
     }
   }
 
@@ -1794,7 +1814,7 @@
       .getChanges(0, query, undefined, options)
       .then(changes => {
         if (!changes) {
-          console.error('getChanges returns undefined');
+          this.reporting.error(new Error('getChanges returns undefined'));
           return;
         }
         this.$.confirmCherrypick.updateChanges(changes);
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
index 3b6a2bf..0279b7e 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_test.js
@@ -21,11 +21,14 @@
 import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader.js';
 import {
+  createAccountWithId,
+  createApproval,
   createChange,
   createChangeMessages,
   createRevisions,
 } from '../../../test/test-data-generators.js';
 import {appContext} from '../../../services/app-context.js';
+import {ChangeStatus} from '../../../constants/constants.js';
 
 const basicFixture = fixtureFromElement('gr-change-actions');
 
@@ -105,6 +108,9 @@
           enabled: true,
         },
       };
+      element.account = {
+        _account_id: 123,
+      };
       sinon.stub(appContext.restApiService, 'getRepoBranches').returns(
           Promise.resolve([]));
 
@@ -736,11 +742,11 @@
         const changes = [
           {
             change_id: '12345678901234', topic: 'T', subject: 'random',
-            project: 'A',
+            project: 'A', status: 'MERGED',
           },
           {
             change_id: '23456', topic: 'T', subject: 'a'.repeat(100),
-            project: 'B',
+            project: 'B', status: 'NEW',
           },
         ];
         setup(done => {
@@ -763,8 +769,8 @@
           flush(() => {
             const changesTable = dialog.shadowRoot.querySelector('table');
             const headers = Array.from(changesTable.querySelectorAll('th'));
-            const expectedHeadings = ['Change', 'Subject', 'Project',
-              'Status', ''];
+            const expectedHeadings = ['', 'Change', 'Status', 'Subject',
+              'Project', 'Progress', ''];
             const headings = headers.map(header => header.innerText);
             assert.equal(headings.length, expectedHeadings.length);
             for (let i = 0; i < headings.length; i++) {
@@ -773,7 +779,7 @@
             const changeRows = changesTable.querySelectorAll('tbody > tr');
             const change = Array.from(changeRows[0].querySelectorAll('td'))
                 .map(e => e.innerText);
-            const expectedChange = ['1234567890', 'random', 'A',
+            const expectedChange = ['', '1234567890', 'MERGED', 'random', 'A',
               'NOT STARTED', ''];
             for (let i = 0; i < change.length; i++) {
               assert.equal(change[i].trim(), expectedChange[i]);
@@ -1525,9 +1531,6 @@
       setup(() => {
         element.change = {
           current_revision: 'abc1234',
-        };
-        element.change = {
-          current_revision: 'abc1234',
           labels: {
             foo: {
               values: {
@@ -1574,6 +1577,16 @@
         assert.equal(approveButton.getAttribute('data-label'), 'foo+1');
       });
 
+      test('not added when change is merged', () => {
+        element.change.status = ChangeStatus.MERGED;
+        flush(() => {
+          const approveButton =
+          element.shadowRoot
+              .querySelector('gr-button[data-action-key=\'review\']');
+          assert.isNull(approveButton);
+        });
+      });
+
       test('not added when already approved', () => {
         element.change = {
           current_revision: 'abc1234',
@@ -1734,10 +1747,66 @@
             };
             flush();
             const approveButton =
-              element.shadowRoot
-                  .querySelector('gr-button[data-action-key=\'review\']');
+                element.shadowRoot
+                    .querySelector('gr-button[data-action-key=\'review\']');
             assert.isNotNull(approveButton);
           });
+
+      test('not added when the user has already approved', () => {
+        const vote = {
+          ...createApproval(),
+          _account_id: 123,
+          name: 'name',
+          value: 2,
+        };
+        element.change = {
+          current_revision: 'abc1234',
+          labels: {
+            'Code-Review': {
+              approved: {},
+              values: {
+                ' 0': '',
+                '+1': '',
+                '+2': '',
+              },
+              all: [vote],
+            },
+          },
+          permitted_labels: {
+            'Code-Review': [' 0', '+1', '+2'],
+          },
+        };
+        flush();
+        const approveButton =
+            element.shadowRoot
+                .querySelector('gr-button[data-action-key=\'review\']');
+        assert.isNull(approveButton);
+      });
+
+      test('not added when user owns the change', () => {
+        element.change = {
+          current_revision: 'abc1234',
+          owner: createAccountWithId(123),
+          labels: {
+            'Code-Review': {
+              approved: {},
+              values: {
+                ' 0': '',
+                '+1': '',
+                '+2': '',
+              },
+            },
+          },
+          permitted_labels: {
+            'Code-Review': [' 0', '+1', '+2'],
+          },
+        };
+        flush();
+        const approveButton =
+            element.shadowRoot
+                .querySelector('gr-button[data-action-key=\'review\']');
+        assert.isNull(approveButton);
+      });
     });
 
     test('adds download revision action', () => {
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts
index d67cc73..36ef429 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.ts
@@ -28,7 +28,6 @@
 import '../../shared/gr-limited-text/gr-limited-text';
 import '../../shared/gr-linked-chip/gr-linked-chip';
 import '../../shared/gr-tooltip-content/gr-tooltip-content';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-change-requirements/gr-change-requirements';
 import '../gr-commit-info/gr-commit-info';
 import '../gr-reviewer-list/gr-reviewer-list';
@@ -82,6 +81,7 @@
   isSectionSet,
   DisplayRules,
 } from '../../../utils/change-metadata-util';
+import {fireEvent} from '../../../utils/event-util';
 
 const HASHTAG_ADD_MESSAGE = 'Add Hashtag';
 
@@ -316,9 +316,7 @@
         this._settingTopic = false;
         this.set(['change', 'topic'], newTopic);
         if (newTopic !== lastTopic) {
-          this.dispatchEvent(
-            new CustomEvent('topic-changed', {bubbles: true, composed: true})
-          );
+          fireEvent(this, 'topic-changed');
         }
       });
   }
@@ -361,12 +359,7 @@
       .setChangeHashtag(this.change._number, {add: [newHashtag]})
       .then(newHashtag => {
         this.set(['change', 'hashtags'], newHashtag);
-        this.dispatchEvent(
-          new CustomEvent('hashtag-changed', {
-            bubbles: true,
-            composed: true,
-          })
-        );
+        fireEvent(this, 'hashtag-changed');
       });
   }
 
@@ -517,9 +510,7 @@
       .then(() => {
         target.disabled = false;
         this.set(['change', 'topic'], '');
-        this.dispatchEvent(
-          new CustomEvent('topic-changed', {bubbles: true, composed: true})
-        );
+        fireEvent(this, 'topic-changed');
       })
       .catch(() => {
         target.disabled = false;
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 a2f72b7..3b89a33 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
@@ -49,7 +49,15 @@
       pointer-events: none;
     }
     .hashtagChip {
-      margin-bottom: var(--spacing-m);
+      padding-bottom: var(--spacing-s);
+    }
+    /* consistent with section .title, .value */
+    .hashtagChip.new-change-summary-true:not(last-of-type) {
+      padding-bottom: var(--spacing-s);
+    }
+    .hashtagChip.new-change-summary-true:last-of-type {
+      display: inline;
+      vertical-align: top;
     }
     #externalStyle {
       display: block;
@@ -340,6 +348,7 @@
             placeholder="[[_computeTopicPlaceholder(_topicReadOnly)]]"
             read-only="[[_topicReadOnly]]"
             on-changed="_handleTopicChanged"
+            show-as-edit-pencil="[[_isNewChangeSummaryUiEnabled]]"
           ></gr-editable-label>
         </template>
       </span>
@@ -377,7 +386,7 @@
       <span class="value">
         <template is="dom-repeat" items="[[change.hashtags]]">
           <gr-linked-chip
-            class="hashtagChip"
+            class$="hashtagChip new-change-summary-[[_isNewChangeSummaryUiEnabled]]"
             text="[[item]]"
             href="[[_computeHashtagUrl(item)]]"
             removable="[[!_hashtagReadOnly]]"
@@ -394,6 +403,7 @@
             placeholder="[[_computeHashtagPlaceholder(_hashtagReadOnly)]]"
             read-only="[[_hashtagReadOnly]]"
             on-changed="_handleHashtagChanged"
+            show-as-edit-pencil="[[_isNewChangeSummaryUiEnabled]]"
           ></gr-editable-label>
         </template>
       </span>
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
index 3ee3470..ab7d09b 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
@@ -360,13 +360,6 @@
         );
       });
 
-      test('_getNonOwnerRole null for uploader with no current rev', () => {
-        delete change!.current_revision;
-        assert.isNotOk(
-          element._getNonOwnerRole(change, element._CHANGE_ROLE.UPLOADER)
-        );
-      });
-
       test('_computeShowRoleClass show uploader', () => {
         assert.equal(
           element._computeShowRoleClass(change, element._CHANGE_ROLE.UPLOADER),
@@ -407,26 +400,12 @@
         );
       });
 
-      test('_getNonOwnerRole null for committer with no current rev', () => {
-        delete change!.current_revision;
-        assert.isNotOk(
-          element._getNonOwnerRole(change, element._CHANGE_ROLE.COMMITTER)
-        );
-      });
-
       test('_getNonOwnerRole null for committer with no commit', () => {
         delete change!.revisions.rev1.commit;
         assert.isNotOk(
           element._getNonOwnerRole(change, element._CHANGE_ROLE.COMMITTER)
         );
       });
-
-      test('_getNonOwnerRole null for committer with no committer', () => {
-        delete change!.revisions.rev1.commit!.committer;
-        assert.isNotOk(
-          element._getNonOwnerRole(change, element._CHANGE_ROLE.COMMITTER)
-        );
-      });
     });
 
     suite('role=author', () => {
@@ -445,26 +424,12 @@
         );
       });
 
-      test('_getNonOwnerRole null for author with no current rev', () => {
-        delete change!.current_revision;
-        assert.isNotOk(
-          element._getNonOwnerRole(change, element._CHANGE_ROLE.AUTHOR)
-        );
-      });
-
       test('_getNonOwnerRole null for author with no commit', () => {
         delete change!.revisions.rev1.commit;
         assert.isNotOk(
           element._getNonOwnerRole(change, element._CHANGE_ROLE.AUTHOR)
         );
       });
-
-      test('_getNonOwnerRole null for author with no author', () => {
-        delete change!.revisions.rev1.commit!.author;
-        assert.isNotOk(
-          element._getNonOwnerRole(change, element._CHANGE_ROLE.AUTHOR)
-        );
-      });
     });
   });
 
@@ -609,7 +574,6 @@
     element.revision = undefined;
     assert.equal(element._currentParents[0].commit, '111');
     element.change = createParsedChange();
-    delete element.change.current_revision;
     assert.deepEqual(element._currentParents, []);
   });
 
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 1731874..684891f 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
@@ -28,7 +28,6 @@
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
 import '../../shared/gr-linked-text/gr-linked-text';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-tooltip-content/gr-tooltip-content';
 import '../gr-change-actions/gr-change-actions';
 import '../gr-change-metadata/gr-change-metadata';
@@ -54,9 +53,9 @@
   Shortcut,
 } from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {GrEditConstants} from '../../edit/gr-edit-constants';
-import {GrCountStringFormatter} from '../../shared/gr-count-string-formatter/gr-count-string-formatter';
+import {pluralize} from '../../../utils/string-util';
 import {getComputedStyleValue} from '../../../utils/dom-util';
-import {GerritNav, GerritView} from '../../core/gr-navigation/gr-navigation';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {getPluginEndpoints} from '../../shared/gr-js-api-interface/gr-plugin-endpoints';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader';
 import {RevisionInfo as RevisionInfoClass} from '../../shared/revision-info/revision-info';
@@ -146,14 +145,15 @@
   EditableContentSaveEvent,
   OpenFixPreviewEvent,
   SwitchTabEvent,
+  ThreadListModifiedEvent,
 } 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 {PORTING_COMMENTS_CHANGE_LATENCY_LABEL} from '../../../services/gr-reporting/gr-reporting';
-import {fireAlert, firePageError} from '../../../utils/event-util';
+import {fireAlert, fireEvent, firePageError} from '../../../utils/event-util';
 import {KnownExperimentId} from '../../../services/flags/flags';
 import {fireTitleChange} from '../../../utils/event-util';
+import {GerritView} from '../../../services/router/router-model';
 
 const CHANGE_ID_ERROR = {
   MISMATCH: 'mismatch',
@@ -601,6 +601,11 @@
       this._handleReloadCommentThreads()
     );
 
+    this.addEventListener(
+      'thread-list-modified',
+      (e: ThreadListModifiedEvent) => this._handleReloadDiffComments(e)
+    );
+
     this.addEventListener('open-reply-dialog', () => this._openReplyDialog());
   }
 
@@ -934,8 +939,7 @@
     const commentCount = this._robotCommentCountPerPatchSet(commentThreads);
     const commentCnt = commentCount[patch._number] || 0;
     if (commentCnt === 0) return `Patchset ${patch._number}`;
-    const findingsText = commentCnt === 1 ? 'finding' : 'findings';
-    return `Patchset ${patch._number} (${commentCnt} ${findingsText})`;
+    return `Patchset ${patch._number} (${pluralize(commentCnt, 'finding')})`;
   }
 
   _computeRobotCommentsPatchSetDropdownItems(
@@ -1024,14 +1028,9 @@
   ) {
     if (!changeComments) return undefined;
     const draftCount = changeComments.computeDraftCount();
-    const unresolvedString = GrCountStringFormatter.computeString(
-      unresolvedCount,
-      'unresolved'
-    );
-    const draftString = GrCountStringFormatter.computePluralString(
-      draftCount,
-      'draft'
-    );
+    const unresolvedString =
+      unresolvedCount === 0 ? '' : `${unresolvedCount} unresolved`;
+    const draftString = pluralize(draftCount, 'draft');
 
     return (
       unresolvedString +
@@ -1623,12 +1622,7 @@
     }
     this._getLoggedIn().then(isLoggedIn => {
       if (!isLoggedIn) {
-        this.dispatchEvent(
-          new CustomEvent('show-auth-required', {
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireEvent(this, 'show-auth-required');
         return;
       }
 
@@ -2092,19 +2086,11 @@
     if (!this._changeNum)
       throw new Error('missing required changeNum property');
 
-    const portedCommentsPromise = this.$.commentAPI.getPortedComments(
-      this._changeNum
-    );
-    const commentsPromise = this.$.commentAPI
-      .loadAll(this._changeNum)
+    return this.$.commentAPI
+      .loadAll(this._changeNum, this._patchRange?.patchNum)
       .then(comments => {
-        this.reporting.time(PORTING_COMMENTS_CHANGE_LATENCY_LABEL);
         this._recomputeComments(comments);
       });
-    Promise.all([portedCommentsPromise, commentsPromise]).then(() => {
-      this.reporting.timeEnd(PORTING_COMMENTS_CHANGE_LATENCY_LABEL);
-    });
-    return commentsPromise;
   }
 
   /**
@@ -2176,12 +2162,7 @@
     const loadingFlagSet = detailCompletes
       .then(() => {
         this._loading = false;
-        this.dispatchEvent(
-          new CustomEvent('change-details-loaded', {
-            bubbles: true,
-            composed: true,
-          })
-        );
+        fireEvent(this, 'change-details-loaded');
       })
       .then(() => {
         this.reporting.timeEnd(CHANGE_RELOAD_TIMING_LABEL);
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 c4b701f..4fcc9fe 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
@@ -405,6 +405,7 @@
             has-parent="[[hasParent]]"
             actions="[[_change.actions]]"
             revision-actions="{{_currentRevisionActions}}"
+            account="[[_account]]"
             change-num="[[_changeNum]]"
             change-status="[[_change.status]]"
             commit-num="[[_commitInfo.commit]]"
@@ -622,9 +623,7 @@
           change-num="[[_changeNum]]"
           patch-range="{{_patchRange}}"
           change-comments="[[_changeComments]]"
-          drafts="[[_diffDrafts]]"
           revisions="[[_change.revisions]]"
-          project-config="[[_projectConfig]]"
           selected-index="{{viewState.selectedFileIndex}}"
           diff-view-mode="[[viewState.diffMode]]"
           edit-mode="[[_editMode]]"
@@ -647,7 +646,6 @@
           change-num="[[_changeNum]]"
           logged-in="[[_loggedIn]]"
           only-show-robot-comments-with-human-reply=""
-          on-thread-list-modified="_handleReloadDiffComments"
           unresolved-only
         ></gr-thread-list>
       </template>
@@ -675,7 +673,6 @@
           logged-in="[[_loggedIn]]"
           hide-toggle-buttons
           empty-thread-msg="[[_messages.NO_ROBOT_COMMENTS_THREADS_MSG]]"
-          on-thread-list-modified="_handleReloadDiffComments"
         >
         </gr-thread-list>
         <template is="dom-if" if="[[_showRobotCommentsButton]]">
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
index 5b4e65d..5cb84b4 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
@@ -30,7 +30,7 @@
 import {GrEditConstants} from '../../edit/gr-edit-constants';
 import {_testOnly_resetEndpoints} from '../../shared/gr-js-api-interface/gr-plugin-endpoints';
 import {getComputedStyleValue} from '../../../utils/dom-util';
-import {GerritNav, GerritView} from '../../core/gr-navigation/gr-navigation';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader';
 import {_testOnly_initGerritPluginApi} from '../../shared/gr-js-api-interface/gr-gerrit';
 import {EventType, PluginApi} from '../../plugins/gr-plugin-types';
@@ -102,6 +102,7 @@
 import 'lodash/lodash';
 import {ParsedChangeInfo} from '../../shared/gr-rest-api-interface/gr-reviewer-updates-parser';
 import {ChangeComments} from '../../diff/gr-comment-api/gr-comment-api';
+import {GerritView} from '../../../services/router/router-model';
 
 const pluginApi = _testOnly_initGerritPluginApi();
 const fixture = fixtureFromElement('gr-change-view');
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts
index 6a4d5b1..1195ea6 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.ts
@@ -19,7 +19,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-dialog/gr-dialog';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
@@ -32,6 +31,7 @@
   RepoName,
   BranchName,
   CommitId,
+  ChangeInfoId,
 } from '../../../types/common';
 import {ReportingService} from '../../../services/gr-reporting/gr-reporting';
 import {customElement, property, observe} from '@polymer/decorators';
@@ -41,6 +41,7 @@
 } from '../../shared/gr-autocomplete/gr-autocomplete';
 import {HttpMethod, ChangeStatus} from '../../../constants/constants';
 import {hasOwnProperty} from '../../../utils/common-util';
+import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 
 const SUGGESTIONS_LIMIT = 15;
 const CHANGE_SUBJECT_LIMIT = 50;
@@ -49,11 +50,18 @@
   TOPIC,
 }
 
+// These values are directly displayed in the dialog to show progress of change
+enum ProgressStatus {
+  RUNNING = 'RUNNING',
+  FAILED = 'FAILED',
+  NOT_STARTED = 'NOT STARTED',
+  SUCCESSFUL = 'SUCCESSFUL',
+}
+
 type Statuses = {[changeId: string]: Status};
 
-// TODO(TS): maybe convert status to an enum
 interface Status {
-  status: string;
+  status: ProgressStatus;
   msg?: string;
 }
 
@@ -140,6 +148,8 @@
   @property({type: Object})
   reporting: ReportingService;
 
+  private selectedChangeIds = new Set<ChangeInfoId>();
+
   private restApiService = appContext.restApiService;
 
   constructor() {
@@ -155,6 +165,7 @@
     const projects: {[projectName: string]: boolean} = {};
     this._duplicateProjectChanges = false;
     changes.forEach(change => {
+      this.selectedChangeIds.add(change.id);
       if (projects[change.project]) {
         this._duplicateProjectChanges = true;
       }
@@ -172,6 +183,19 @@
     );
   }
 
+  _isChangeSelected(changeId: ChangeInfoId) {
+    return this.selectedChangeIds.has(changeId);
+  }
+
+  _toggleChangeSelected(e: Event) {
+    const changeId = ((dom(e) as EventApi).localTarget as HTMLElement).dataset[
+      'item'
+    ]! as ChangeInfoId;
+    if (this.selectedChangeIds.has(changeId))
+      this.selectedChangeIds.delete(changeId);
+    else this.selectedChangeIds.add(changeId);
+  }
+
   _computeTopicErrorMessage(duplicateProjectChanges: boolean) {
     if (duplicateProjectChanges) {
       return 'Two changes cannot be of the same project';
@@ -184,18 +208,19 @@
   }
 
   _computeStatus(change: ChangeInfo, statuses: Statuses) {
-    if (!change || !statuses || !statuses[change.id]) return 'NOT STARTED';
+    if (!change || !statuses || !statuses[change.id])
+      return ProgressStatus.NOT_STARTED;
     return statuses[change.id].status;
   }
 
   _computeStatusClass(change: ChangeInfo, statuses: Statuses) {
     if (!change || !statuses || !statuses[change.id]) return '';
-    return statuses[change.id].status === 'FAILED' ? 'error' : '';
+    return statuses[change.id].status === ProgressStatus.FAILED ? 'error' : '';
   }
 
   _computeError(change: ChangeInfo, statuses: Statuses) {
     if (!change || !statuses || !statuses[change.id]) return '';
-    if (statuses[change.id].status === 'FAILED') {
+    if (statuses[change.id].status === ProgressStatus.FAILED) {
       return statuses[change.id].msg;
     }
     return '';
@@ -213,7 +238,7 @@
 
   _computeCancelLabel(statuses: Statuses) {
     const isRunningChange = Object.values(statuses).some(
-      v => v.status === 'RUNNING'
+      v => v.status === ProgressStatus.RUNNING
     );
     return isRunningChange ? 'Close' : 'Cancel';
   }
@@ -228,7 +253,7 @@
     if (duplicateProject) return true;
     if (!statuses) return false;
     const isRunningChange = Object.values(statuses).some(
-      v => v.status === 'RUNNING'
+      v => v.status === ProgressStatus.RUNNING
     );
     return isRunningChange;
   }
@@ -281,14 +306,22 @@
   _handleCherryPickFailed(change: ChangeInfo, response?: Response | null) {
     if (!response) return;
     response.text().then((errText: string) => {
-      this.updateStatus(change, {status: 'FAILED', msg: errText});
+      this.updateStatus(change, {status: ProgressStatus.FAILED, msg: errText});
     });
   }
 
   _handleCherryPickTopic() {
-    const topic = this._generateRandomCherryPickTopic(this.changes[0]);
-    this.changes.forEach(change => {
-      this.updateStatus(change, {status: 'RUNNING'});
+    const changes = this.changes.filter(change =>
+      this.selectedChangeIds.has(change.id)
+    );
+    if (!changes.length) {
+      const errorSpan = this.shadowRoot?.querySelector('.error-message');
+      errorSpan!.innerHTML = 'No change selected';
+      return;
+    }
+    const topic = this._generateRandomCherryPickTopic(changes[0]);
+    changes.forEach(change => {
+      this.updateStatus(change, {status: ProgressStatus.RUNNING});
       const payload = {
         destination: this.branch,
         base: null,
@@ -311,9 +344,9 @@
           handleError
         )
         .then(() => {
-          this.updateStatus(change, {status: 'SUCCESSFUL'});
+          this.updateStatus(change, {status: ProgressStatus.SUCCESSFUL});
           const failedOrPending = Object.values(this._statuses).find(
-            v => v.status !== 'SUCCESSFUL'
+            v => v.status !== ProgressStatus.SUCCESSFUL
           );
           if (!failedOrPending) {
             /* This needs some more work, as the new topic may not always be
@@ -360,7 +393,7 @@
     input: string
   ): Promise<AutocompleteSuggestion[]> {
     if (!this.project) {
-      console.error('no project specified');
+      this.reporting.error(new Error('no project specified'));
       return Promise.resolve([]);
     }
     if (input.startsWith('refs/heads/')) {
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts
index f784425..16262c6 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_html.ts
@@ -179,10 +179,12 @@
         <table>
           <thead>
             <tr>
+              <th></th>
               <th>Change</th>
+              <th>Status</th>
               <th>Subject</th>
               <th>Project</th>
-              <th>Status</th>
+              <th>Progress</th>
               <!-- Error Message -->
               <th></th>
             </tr>
@@ -190,7 +192,16 @@
           <tbody>
             <template is="dom-repeat" items="[[changes]]">
               <tr>
+                <td>
+                  <input
+                    type="checkbox"
+                    data-item$="[[item.id]]"
+                    on-change="_toggleChangeSelected"
+                    checked="[[_isChangeSelected(item.id)]]"
+                  />
+                </td>
                 <td><span> [[_getChangeId(item)]] </span></td>
+                <td><span> [[item.status]] </span></td>
                 <td>
                   <span> [[_getTrimmedChangeSubject(item.subject)]] </span>
                 </td>
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js
index cc4bb8f..ae34b70 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog_test.js
@@ -88,6 +88,7 @@
   suite('cherry pick topic', () => {
     const changes = [
       {
+        id: '1234',
         change_id: '12345678901234', topic: 'T', subject: 'random',
         project: 'A',
         _number: 1,
@@ -97,6 +98,7 @@
         current_revision: 'a',
       },
       {
+        id: '5678',
         change_id: '23456', topic: 'T', subject: 'a'.repeat(100),
         project: 'B',
         _number: 2,
@@ -109,6 +111,7 @@
     setup(() => {
       element.updateChanges(changes);
       element._cherryPickType = CHERRY_PICK_TYPES.TOPIC;
+      flush();
     });
 
     test('cherry pick topic submit', done => {
@@ -129,6 +132,38 @@
       });
     });
 
+    test('deselecting a change removes it from being cherry picked', () => {
+      element.branch = 'master';
+      const executeChangeActionStub = sinon.stub(element.restApiService,
+          'executeChangeAction').returns(Promise.resolve([]));
+      const checkboxes = element.shadowRoot.querySelectorAll(
+          'input[type="checkbox"]');
+      assert.equal(checkboxes.length, 2);
+      assert.isTrue(checkboxes[0].checked);
+      MockInteractions.tap(checkboxes[0]);
+      MockInteractions.tap(element.shadowRoot.
+          querySelector('gr-dialog').$.confirm);
+      flush();
+      assert.equal(executeChangeActionStub.callCount, 1);
+    });
+
+    test('deselecting all change shows error message', () => {
+      element.branch = 'master';
+      const executeChangeActionStub = sinon.stub(element.restApiService,
+          'executeChangeAction').returns(Promise.resolve([]));
+      const checkboxes = element.shadowRoot.querySelectorAll(
+          'input[type="checkbox"]');
+      assert.equal(checkboxes.length, 2);
+      MockInteractions.tap(checkboxes[0]);
+      MockInteractions.tap(checkboxes[1]);
+      MockInteractions.tap(element.shadowRoot.
+          querySelector('gr-dialog').$.confirm);
+      flush();
+      assert.equal(executeChangeActionStub.callCount, 0);
+      assert.equal(element.shadowRoot.querySelector('.error-message').innerText
+          , 'No change selected');
+    });
+
     test('_computeStatusClass', () => {
       assert.equal(element._computeStatusClass({id: 1}, {1: {status: 'RUNNING'},
       }), '');
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
index 60e2443..ff61de9 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.ts
@@ -17,7 +17,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-dialog/gr-dialog';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
index 15061d2..9e7bdb4 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.ts
@@ -16,7 +16,6 @@
  */
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-dialog/gr-dialog';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts
index 666f95d..6e2e595 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-icon/iron-icon';
 import '../../shared/gr-icons/gr-icons';
 import '../../shared/gr-dialog/gr-dialog';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import '../../../styles/shared-styles';
@@ -28,6 +27,7 @@
 import {customElement, property} from '@polymer/decorators';
 import {ChangeInfo, ActionInfo} from '../../../types/common';
 import {GrDialog} from '../../shared/gr-dialog/gr-dialog';
+import {pluralize} from '../../../utils/string-util';
 
 export interface GrConfirmSubmitDialog {
   $: {
@@ -74,8 +74,8 @@
 
   _computeUnresolvedCommentsWarning(change: ChangeInfo) {
     const unresolvedCount = change.unresolved_comment_count;
-    const plural = unresolvedCount && unresolvedCount > 1 ? 's' : '';
-    return `Heads Up! ${unresolvedCount} unresolved comment${plural}.`;
+    if (!unresolvedCount) throw new Error('unresolved comments undefined or 0');
+    return `Heads Up! ${pluralize(unresolvedCount, 'unresolved comment')}.`;
   }
 
   _handleConfirmTap(e: MouseEvent) {
diff --git a/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_test.js b/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_test.ts
similarity index 65%
rename from polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_test.js
rename to polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_test.ts
index 7401026..52ec8af 100644
--- a/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog_test.ts
@@ -15,29 +15,46 @@
  * limitations under the License.
  */
 
-import '../../../test/common-test-setup-karma.js';
-import './gr-download-dialog.js';
+import '../../../test/common-test-setup-karma';
+import {tap} from '@polymer/iron-test-helpers/mock-interactions';
+import {
+  createChange,
+  createCommit,
+  createRevision,
+  createRevisions,
+  createServerInfo,
+} from '../../../test/test-data-generators';
+import {
+  CommitId,
+  NumericChangeId,
+  PatchSetNum,
+  RepoName,
+} from '../../../types/common';
+import {GrDownloadDialog} from './gr-download-dialog';
 
 const basicFixture = fixtureFromElement('gr-download-dialog');
 
 function getChangeObject() {
   return {
-    current_revision: '34685798fe548b6d17d1e8e5edc43a26d055cc72',
+    ...createChange(),
+    current_revision: '34685798fe548b6d17d1e8e5edc43a26d055cc72' as CommitId,
     revisions: {
       '34685798fe548b6d17d1e8e5edc43a26d055cc72': {
-        _number: 1,
-        commit: {
-          parents: [],
-        },
+        ...createRevision(),
+        commit: createCommit(),
         fetch: {
           repo: {
+            url: 'my.url',
+            ref: 'refs/changes/5/6/1',
             commands: {
               repo: 'repo download test-project 5/1',
             },
           },
           ssh: {
+            url: 'my.url',
+            ref: 'refs/changes/5/6/1',
             commands: {
-              'Checkout':
+              Checkout:
                 'git fetch ' +
                 'ssh://andybons@localhost:29418/test-project ' +
                 'refs/changes/05/5/1 && git checkout FETCH_HEAD',
@@ -50,15 +67,17 @@
                 'ssh://andybons@localhost:29418/test-project ' +
                 'refs/changes/05/5/1 ' +
                 '&& git format-patch -1 --stdout FETCH_HEAD',
-              'Pull':
+              Pull:
                 'git pull ' +
                 'ssh://andybons@localhost:29418/test-project ' +
                 'refs/changes/05/5/1',
             },
           },
           http: {
+            url: 'my.url',
+            ref: 'refs/changes/5/6/1',
             commands: {
-              'Checkout':
+              Checkout:
                 'git fetch ' +
                 'http://andybons@localhost:8080/a/test-project ' +
                 'refs/changes/05/5/1 && git checkout FETCH_HEAD',
@@ -71,7 +90,7 @@
                 'http://andybons@localhost:8080/a/test-project ' +
                 'refs/changes/05/5/1 && ' +
                 'git format-patch -1 --stdout FETCH_HEAD',
-              'Pull':
+              Pull:
                 'git pull ' +
                 'http://andybons@localhost:8080/a/test-project ' +
                 'refs/changes/05/5/1',
@@ -85,41 +104,24 @@
 
 function getChangeObjectNoFetch() {
   return {
-    current_revision: '34685798fe548b6d17d1e8e5edc43a26d055cc72',
-    revisions: {
-      '34685798fe548b6d17d1e8e5edc43a26d055cc72': {
-        _number: 1,
-        commit: {
-          parents: [],
-        },
-        fetch: {},
-      },
-    },
+    ...createChange(),
+    current_revision: '34685798fe548b6d17d1e8e5edc43a26d055cc72' as CommitId,
+    revisions: createRevisions(1),
   };
 }
 
 suite('gr-download-dialog', () => {
-  let element;
+  let element: GrDownloadDialog;
 
   setup(() => {
     element = basicFixture.instantiate();
-    element.patchNum = '1';
-    element.config = {
-      schemes: {
-        'anonymous http': {},
-        'http': {},
-        'repo': {},
-        'ssh': {},
-      },
-      archives: ['tgz', 'tar', 'tbz2', 'txz'],
-    };
-
+    element.patchNum = 1 as PatchSetNum;
+    element.config = createServerInfo();
     flush();
   });
 
   test('anchors use download attribute', () => {
-    const anchors = Array.from(
-        element.root.querySelectorAll('a'));
+    const anchors = Array.from(element.root!.querySelectorAll('a'));
     assert.isTrue(!anchors.some(a => !a.hasAttribute('download')));
   });
 
@@ -152,17 +154,28 @@
     });
 
     test('computed fields', () => {
-      assert.equal(element._computeArchiveDownloadLink(
-          {project: 'test/project', _number: 123}, 2, 'tgz'),
-      '/changes/test%2Fproject~123/revisions/2/archive?format=tgz');
+      assert.equal(
+        element._computeArchiveDownloadLink(
+          {
+            ...createChange(),
+            project: 'test/project' as RepoName,
+            _number: 123 as NumericChangeId,
+          },
+          2 as PatchSetNum,
+          'tgz'
+        ),
+        '/changes/test%2Fproject~123/revisions/2/archive?format=tgz'
+      );
     });
 
     test('close event', done => {
       element.addEventListener('close', () => {
         done();
       });
-      MockInteractions.tap(element.shadowRoot
-          .querySelector('.closeButtonContainer gr-button'));
+      const closeButton = element.shadowRoot!.querySelector(
+        '.closeButtonContainer gr-button'
+      );
+      tap(closeButton!);
     });
   });
 
@@ -172,35 +185,49 @@
   });
 
   test('_computeHidePatchFile', () => {
-    const patchNum = '1';
+    const patchNum = 1 as PatchSetNum;
 
     const changeWithNoParent = {
+      ...createChange(),
       revisions: {
-        r1: {_number: 1, commit: {parents: []}},
+        r1: {...createRevision(), commit: createCommit()},
       },
     };
     assert.isTrue(element._computeHidePatchFile(changeWithNoParent, patchNum));
 
     const changeWithOneParent = {
+      ...createChange(),
       revisions: {
-        r1: {_number: 1, commit: {parents: [
-          {commit: 'p1'},
-        ]}},
+        r1: {
+          ...createRevision(),
+          commit: {
+            ...createCommit(),
+            parents: [{commit: 'p1' as CommitId, subject: 'subject1'}],
+          },
+        },
       },
     };
     assert.isFalse(
-        element._computeHidePatchFile(changeWithOneParent, patchNum));
+      element._computeHidePatchFile(changeWithOneParent, patchNum)
+    );
 
     const changeWithMultipleParents = {
+      ...createChange(),
       revisions: {
-        r1: {_number: 1, commit: {parents: [
-          {commit: 'p1'},
-          {commit: 'p2'},
-        ]}},
+        r1: {
+          ...createRevision(),
+          commit: {
+            ...createCommit(),
+            parents: [
+              {commit: 'p1' as CommitId, subject: 'subject1'},
+              {commit: 'p2' as CommitId, subject: 'subject2'},
+            ],
+          },
+        },
       },
     };
     assert.isTrue(
-        element._computeHidePatchFile(changeWithMultipleParents, patchNum));
+      element._computeHidePatchFile(changeWithMultipleParents, patchNum)
+    );
   });
 });
-
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
index e5405e3..3c99648 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
@@ -20,7 +20,6 @@
 import '../../edit/gr-edit-controls/gr-edit-controls';
 import '../../shared/gr-editable-label/gr-editable-label';
 import '../../shared/gr-linked-chip/gr-linked-chip';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-icons/gr-icons';
@@ -55,6 +54,7 @@
 import {DiffViewMode} from '../../../constants/constants';
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {appContext} from '../../../services/app-context';
+import {fireEvent} from '../../../utils/event-util';
 
 // Maximum length for patch set descriptions.
 const PATCH_DESC_MAX_LENGTH = 500;
@@ -191,21 +191,11 @@
   }
 
   _expandAllDiffs() {
-    this.dispatchEvent(
-      new CustomEvent('expand-diffs', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'expand-diffs');
   }
 
   _collapseAllDiffs() {
-    this.dispatchEvent(
-      new CustomEvent('collapse-diffs', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'collapse-diffs');
   }
 
   _computeExpandedClass(filesExpanded: FilesExpandedState) {
@@ -342,22 +332,12 @@
 
   _handlePrefsTap(e: Event) {
     e.preventDefault();
-    this.dispatchEvent(
-      new CustomEvent('open-diff-prefs', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'open-diff-prefs');
   }
 
   _handleIncludedInTap(e: Event) {
     e.preventDefault();
-    this.dispatchEvent(
-      new CustomEvent('open-included-in-dialog', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'open-included-in-dialog');
   }
 
   _handleDownloadTap(e: Event) {
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
index d9beff4..1e72ae9 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
@@ -29,7 +29,6 @@
     }
     .patchInfo-header {
       align-items: center;
-      border-top: 1px solid var(--border-color);
       display: flex;
       padding: var(--spacing-s) var(--spacing-l);
     }
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
index d2ad8c1..c062188 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
@@ -23,10 +23,10 @@
 import '../../shared/gr-cursor-manager/gr-cursor-manager';
 import '../../shared/gr-icons/gr-icons';
 import '../../shared/gr-linked-text/gr-linked-text';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import '../../shared/gr-tooltip-content/gr-tooltip-content';
 import '../../shared/gr-copy-clipboard/gr-copy-clipboard';
+import '../../shared/gr-file-status-chip/gr-file-status-chip';
 import {flush} 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';
@@ -39,7 +39,7 @@
   Shortcut,
 } from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {FilesExpandedState} from '../gr-file-list-constants';
-import {GrCountStringFormatter} from '../../shared/gr-count-string-formatter/gr-count-string-formatter';
+import {pluralize} from '../../../utils/string-util';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {getPluginEndpoints} from '../../shared/gr-js-api-interface/gr-plugin-endpoints';
 import {getPluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader';
@@ -55,7 +55,6 @@
 } from '../../../utils/path-list-util';
 import {customElement, observe, property} from '@polymer/decorators';
 import {
-  ConfigInfo,
   ElementPropertyDeepChange,
   FileInfo,
   FileNameToFileInfoMap,
@@ -73,10 +72,9 @@
 import {GrCursorManager} from '../../shared/gr-cursor-manager/gr-cursor-manager';
 import {PolymerSpliceChange} from '@polymer/polymer/interfaces';
 import {ChangeComments} from '../../diff/gr-comment-api/gr-comment-api';
-import {UIDraft} from '../../../utils/comment-util';
 import {ParsedChangeInfo} from '../../shared/gr-rest-api-interface/gr-reviewer-updates-parser';
-import {PatchSetFile} from '../../../types/types';
 import {CustomKeyboardEvent} from '../../../types/events';
+import {PatchSetFile} from '../../../types/types';
 
 export const DEFAULT_NUM_FILES_SHOWN = 200;
 
@@ -92,16 +90,6 @@
 const EXPAND_ALL_TIMING_LABEL = 'ExpandAllDiffs';
 const EXPAND_ALL_AVG_TIMING_LABEL = 'ExpandAllPerDiff';
 
-const FileStatus = {
-  A: 'Added',
-  C: 'Copied',
-  D: 'Deleted',
-  M: 'Modified',
-  R: 'Renamed',
-  W: 'Rewritten',
-  U: 'Unchanged',
-};
-
 const FILE_ROW_CLASS = 'file-row';
 
 export interface GrFileList {
@@ -115,7 +103,7 @@
 interface ReviewedFileInfo extends FileInfo {
   isReviewed?: boolean;
 }
-interface NormalizedFileInfo extends ReviewedFileInfo {
+export interface NormalizedFileInfo extends ReviewedFileInfo {
   __path: string;
 }
 
@@ -207,15 +195,9 @@
   @property({type: Object})
   changeComments?: ChangeComments;
 
-  @property({type: Object})
-  drafts?: {[path: string]: UIDraft[]};
-
   @property({type: Array})
   revisions?: {[revisionId: string]: RevisionInfo};
 
-  @property({type: Object})
-  projectConfig?: ConfigInfo;
-
   @property({type: Number, notify: true})
   selectedIndex = -1;
 
@@ -619,49 +601,16 @@
   _computeCommentsString(
     changeComments?: ChangeComments,
     patchRange?: PatchRange,
-    path?: string
+    file?: NormalizedFileInfo
   ) {
     if (
       changeComments === undefined ||
       patchRange === undefined ||
-      path === undefined
+      file?.__path === undefined
     ) {
       return '';
     }
-    const unresolvedCount =
-      changeComments.computeUnresolvedNum({
-        patchNum: patchRange.basePatchNum,
-        path,
-      }) +
-      changeComments.computeUnresolvedNum({
-        patchNum: patchRange.patchNum,
-        path,
-      });
-    const commentThreadCount =
-      changeComments.computeCommentThreadCount({
-        patchNum: patchRange.basePatchNum,
-        path,
-      }) +
-      changeComments.computeCommentThreadCount({
-        patchNum: patchRange.patchNum,
-        path,
-      });
-    const commentString = GrCountStringFormatter.computePluralString(
-      commentThreadCount,
-      'comment'
-    );
-    const unresolvedString = GrCountStringFormatter.computeString(
-      unresolvedCount,
-      'unresolved'
-    );
-
-    return (
-      commentString +
-      // Add a space if both comments and unresolved
-      (commentString && unresolvedString ? ' ' : '') +
-      // Add parentheses around unresolved if it exists.
-      (unresolvedString ? `(${unresolvedString})` : '')
-    );
+    return changeComments.computeCommentsString(patchRange, file.__path, file);
   }
 
   /**
@@ -688,7 +637,7 @@
         patchNum: patchRange.patchNum,
         path,
       });
-    return GrCountStringFormatter.computePluralString(draftCount, 'draft');
+    return pluralize(draftCount, 'draft');
   }
 
   /**
@@ -715,7 +664,7 @@
         patchNum: patchRange.patchNum,
         path,
       });
-    return GrCountStringFormatter.computeShortString(draftCount, 'd');
+    return draftCount === 0 ? '' : `${draftCount}d`;
   }
 
   /**
@@ -742,7 +691,7 @@
         patchNum: patchRange.patchNum,
         path,
       });
-    return GrCountStringFormatter.computeShortString(commentThreadCount, 'c');
+    return commentThreadCount === 0 ? '' : `${commentThreadCount}c`;
   }
 
   private _reviewFile(path: string, reviewed?: boolean) {
@@ -1165,12 +1114,6 @@
     );
   }
 
-  _computeFileStatus(
-    status?: keyof typeof FileStatus
-  ): keyof typeof FileStatus {
-    return status || 'M';
-  }
-
   _computeDiffURL(
     change?: ParsedChangeInfo,
     patchRange?: PatchRange,
@@ -1245,12 +1188,6 @@
     return classes.join(' ');
   }
 
-  _computeStatusClass(file?: NormalizedFileInfo) {
-    if (!file) return '';
-    const classStr = this._computeClass('status', file.__path);
-    return `${classStr} ${this._computeFileStatus(file.status)}`;
-  }
-
   _computePathClass(
     path: string | undefined,
     expandedFilesRecord: ElementPropertyDeepChange<GrFileList, '_expandedFiles'>
@@ -1406,17 +1343,6 @@
   }
 
   /**
-   * Get a descriptive label for use in the status indicator's tooltip and
-   * ARIA label.
-   */
-  _computeFileStatusLabel(status?: keyof typeof FileStatus) {
-    const statusCode = this._computeFileStatus(status);
-    return hasOwnProperty(FileStatus, statusCode)
-      ? FileStatus[statusCode]
-      : 'Status Unknown';
-  }
-
-  /**
    * Converts any boolean-like variable to the string 'true' or 'false'
    *
    * This method is useful when you bind aria-checked attribute to a boolean
@@ -1558,6 +1484,7 @@
             'changeComments, patchRange and diffPrefs must be set'
           );
         }
+
         diffElem.threads = this.changeComments.getThreadsBySideForFile(
           file,
           this.patchRange
@@ -1647,14 +1574,9 @@
       return;
     }
 
-    // Comments are not returned with the commentSide attribute from
-    // the api, but it's necessary to be stored on the diff's
-    // comments due to use in the _handleCommentUpdate function.
-    // The comment thread already has a side associated with it, so
-    // set the comment's side to match.
-    threadEl.comments = newComments.map(c =>
-      Object.assign(c, {diffSide: threadEl.diffSide})
-    );
+    threadEl.comments = newComments.map(c => {
+      return {...c};
+    });
     flush();
   }
 
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
index b99c96a..ec985af 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
@@ -80,27 +80,6 @@
       text-align: left;
       width: 1.5em;
     }
-    .status {
-      display: inline-block;
-      border-radius: var(--border-radius);
-      margin-left: var(--spacing-s);
-      padding: 0 var(--spacing-m);
-      color: var(--primary-text-color);
-      font-size: var(--font-size-small);
-      background-color: var(--dark-add-highlight-color);
-    }
-    .status.invisible,
-    .status.M {
-      display: none;
-    }
-    .status.D,
-    .status.R,
-    .status.W {
-      background-color: var(--dark-remove-highlight-color);
-    }
-    .status.U {
-      background-color: var(--comment-background-color);
-    }
     .file-row {
       cursor: pointer;
     }
@@ -421,14 +400,7 @@
               >
                 [[_computeTruncatedPath(file.__path)]]
               </span>
-              <span
-                class$="[[_computeStatusClass(file)]]"
-                tabindex="0"
-                title$="[[_computeFileStatusLabel(file.status)]]"
-                aria-label$="[[_computeFileStatusLabel(file.status)]]"
-              >
-                [[_computeFileStatusLabel(file.status)]]
-              </span>
+              <gr-file-status-chip file="[[file]]"></gr-file-status-chip>
               <gr-copy-clipboard
                 hide-input=""
                 text="[[file.__path]]"
@@ -456,8 +428,7 @@
               >
               <span
                 ><!--
-              -->[[_computeCommentsString(changeComments, patchRange,
-                file.__path)]]<!--
+              -->[[_computeCommentsString(changeComments, patchRange, file)]]<!--
            --></span
               >
               <span class="noCommentsScreenReaderText">
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 8f484e9..d0ae833 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
@@ -28,7 +28,8 @@
 import {html} from '@polymer/polymer/lib/utils/html-tag.js';
 import {TestKeyboardShortcutBinder} from '../../../test/test-utils.js';
 import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
-import {ChangeComments} from '../../diff/gr-comment-api/gr-comment-api.js';
+import {createCommentThreads} from '../../../utils/comment-util.js';
+import {createChangeComments} from '../../../test/test-data-generators.js';
 
 const commentApiMock = createCommentApiMockWithTemplateElement(
     'gr-file-list-comment-api-mock', html`
@@ -106,8 +107,6 @@
       // been initialized.
       commentApiWrapper.loadComments().then(() => {
         sinon.stub(element.changeComments, 'getPaths').returns({});
-        sinon.stub(element.changeComments, 'getCommentsBySideForPath')
-            .returns({meta: {}, left: [], right: []});
         done();
       });
       element._loading = false;
@@ -353,101 +352,7 @@
     });
 
     test('comment filtering', () => {
-      const comments = {
-        '/COMMIT_MSG': [
-          {
-            patch_set: 1,
-            message: 'Done',
-            updated: '2017-02-08 16:40:49',
-            id: '1',
-          },
-          {
-            patch_set: 1,
-            message: 'oh hay',
-            updated: '2017-02-09 16:40:49',
-            id: '2',
-          },
-          {
-            patch_set: 2,
-            message: 'hello',
-            updated: '2017-02-10 16:40:49',
-            id: '3',
-          },
-        ],
-        'myfile.txt': [
-          {
-            patch_set: 1,
-            message: 'good news!',
-            updated: '2017-02-08 16:40:49',
-            id: '4',
-          },
-          {
-            patch_set: 2,
-            message: 'wat!?',
-            updated: '2017-02-09 16:40:49',
-            id: '5',
-          },
-          {
-            patch_set: 2,
-            message: 'hi',
-            updated: '2017-02-10 16:40:49',
-            id: '6',
-          },
-        ],
-        'unresolved.file': [
-          {
-            patch_set: 2,
-            message: 'wat!?',
-            updated: '2017-02-09 16:40:49',
-            id: '7',
-            unresolved: true,
-          },
-          {
-            patch_set: 2,
-            message: 'hi',
-            updated: '2017-02-10 16:40:49',
-            id: '8',
-            in_reply_to: '7',
-            unresolved: false,
-          },
-          {
-            patch_set: 2,
-            message: 'good news!',
-            updated: '2017-02-08 16:40:49',
-            id: '9',
-            unresolved: true,
-          },
-        ],
-      };
-      const drafts = {
-        '/COMMIT_MSG': [
-          {
-            patch_set: 1,
-            message: 'hi',
-            updated: '2017-02-15 16:40:49',
-            id: '10',
-            unresolved: true,
-          },
-          {
-            patch_set: 1,
-            message: 'fyi',
-            updated: '2017-02-15 16:40:49',
-            id: '11',
-            unresolved: false,
-          },
-        ],
-        'unresolved.file': [
-          {
-            patch_set: 1,
-            message: 'hi',
-            updated: '2017-02-11 16:40:49',
-            id: '12',
-            unresolved: false,
-          },
-        ],
-      };
-      element.changeComments = new ChangeComments(comments, {}, drafts, 123);
-
+      element.changeComments = createChangeComments();
       const parentTo1 = {
         basePatchNum: 'PARENT',
         patchNum: 1,
@@ -464,12 +369,6 @@
       };
 
       assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo1,
-              '/COMMIT_MSG', 'comment'), '2 comments (1 unresolved)');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              '/COMMIT_MSG', 'comment'), '3 comments (1 unresolved)');
-      assert.equal(
           element._computeCommentsStringMobile(element.changeComments, parentTo1
               , '/COMMIT_MSG'), '2c');
       assert.equal(
@@ -488,12 +387,6 @@
           element._computeDraftsStringMobile(element.changeComments, _1To2,
               'unresolved.file'), '1d');
       assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo1,
-              'myfile.txt', 'comment'), '1 comment');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              'myfile.txt', 'comment'), '3 comments');
-      assert.equal(
           element._computeCommentsStringMobile(
               element.changeComments,
               parentTo1,
@@ -515,12 +408,6 @@
           element._computeDraftsStringMobile(element.changeComments, _1To2,
               'myfile.txt'), '');
       assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo1,
-              'file_added_in_rev2.txt', 'comment'), '');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              'file_added_in_rev2.txt', 'comment'), '');
-      assert.equal(
           element._computeCommentsStringMobile(
               element.changeComments,
               parentTo1,
@@ -542,12 +429,6 @@
           element._computeDraftsStringMobile(element.changeComments, _1To2,
               'file_added_in_rev2.txt'), '');
       assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo2,
-              '/COMMIT_MSG', 'comment'), '1 comment');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              '/COMMIT_MSG', 'comment'), '3 comments (1 unresolved)');
-      assert.equal(
           element._computeCommentsStringMobile(
               element.changeComments,
               parentTo2,
@@ -572,12 +453,6 @@
           element._computeDraftsStringMobile(element.changeComments, _1To2,
               '/COMMIT_MSG'), '2d');
       assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo2,
-              'myfile.txt', 'comment'), '2 comments');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              'myfile.txt', 'comment'), '3 comments');
-      assert.equal(
           element._computeCommentsStringMobile(
               element.changeComments,
               parentTo2,
@@ -592,18 +467,6 @@
       assert.equal(
           element._computeDraftsStringMobile(element.changeComments, _1To2,
               'myfile.txt'), '');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo2,
-              'file_added_in_rev2.txt', 'comment'), '');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              'file_added_in_rev2.txt', 'comment'), '');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, parentTo2,
-              'unresolved.file', 'comment'), '2 comments (1 unresolved)');
-      assert.equal(
-          element._computeCommentsString(element.changeComments, _1To2,
-              'unresolved.file', 'comment'), '2 comments (1 unresolved)');
     });
 
     test('_reviewedTitle', () => {
@@ -836,16 +699,6 @@
       });
     });
 
-    test('computed properties', () => {
-      assert.equal(element._computeFileStatus('A'), 'A');
-      assert.equal(element._computeFileStatus(undefined), 'M');
-      assert.equal(element._computeFileStatus(null), 'M');
-
-      assert.equal(element._computeClass('clazz', '/foo/bar/baz'), 'clazz');
-      assert.equal(element._computeClass('clazz', '/COMMIT_MSG'),
-          'clazz invisible');
-    });
-
     test('file review status', () => {
       element._reviewed = ['/COMMIT_MSG', 'myfile.txt'];
       element._filesByPath = {
@@ -898,11 +751,6 @@
       assert.isFalse(toggleExpandSpy.called);
     });
 
-    test('_computeFileStatusLabel', () => {
-      assert.equal(element._computeFileStatusLabel('A'), 'Added');
-      assert.equal(element._computeFileStatusLabel('M'), 'Modified');
-    });
-
     test('_handleFileListClick', () => {
       element._filesByPath = {
         '/COMMIT_MSG': {},
@@ -1527,17 +1375,8 @@
     ];
 
     async function setupDiff(diff) {
-      diff.comments = {
-        left: diff.path === '/COMMIT_MSG' ? commitMsgComments : [],
-        right: [],
-        meta: {
-          changeNum: 1,
-          patchRange: {
-            basePatchNum: 'PARENT',
-            patchNum: 2,
-          },
-        },
-      };
+      diff.threads = diff.path === '/COMMIT_MSG' ?
+        createCommentThreads(commitMsgComments) : [];
       diff.prefs = {
         context: 10,
         tab_size: 8,
@@ -1556,7 +1395,7 @@
       };
       diff.diff = getMockDiffResponse();
       commentApiWrapper.loadComments().then(() => {
-        sinon.stub(element.changeComments, 'getCommentsBySideForPath')
+        sinon.stub(element.changeComments, 'getCommentsForPath')
             .withArgs('/COMMIT_MSG', {
               basePatchNum: 'PARENT',
               patchNum: 2,
@@ -1608,8 +1447,6 @@
       // been initialized.
       commentApiWrapper.loadComments().then(() => {
         sinon.stub(element.changeComments, 'getPaths').returns({});
-        sinon.stub(element.changeComments, 'getCommentsBySideForPath')
-            .returns({meta: {}, left: [], right: []});
         done();
       });
       element._loading = false;
diff --git a/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.ts b/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.ts
index cf96c98..b50bff4 100644
--- a/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
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 d528192..719734a 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
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-label-score-row/gr-label-score-row';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message.ts b/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
index e6c20fb..fb20f0c 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message.ts
@@ -21,7 +21,6 @@
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../shared/gr-formatted-text/gr-formatted-text';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import '../../../styles/gr-voting-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
@@ -40,10 +39,13 @@
   VotingRangeInfo,
   NumericChangeId,
   ChangeMessageId,
+  PatchSetNum,
 } from '../../../types/common';
 import {CommentThread} from '../../../utils/comment-util';
 import {hasOwnProperty} from '../../../utils/common-util';
 import {appContext} from '../../../services/app-context';
+import {pluralize} from '../../../utils/string-util';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 
 const PATCH_SET_PREFIX_PATTERN = /^(?:Uploaded\s*)?(?:P|p)atch (?:S|s)et \d+:\s*(.*)/;
 const LABEL_TITLE_SCORE_PATTERN = /^(-?)([A-Za-z0-9-]+?)([+-]\d+)?[.]?$/;
@@ -216,31 +218,15 @@
   }
 
   _computeCommentCountText(threadsLength?: number) {
-    if (threadsLength === 0) {
+    if (!threadsLength) {
       return undefined;
-    } else if (threadsLength === 1) {
-      return '1 comment';
-    } else {
-      return `${threadsLength} comments`;
     }
-  }
 
-  _onThreadListModified() {
-    // TODO(taoalpha): this won't propagate the changes to the files
-    // should consider replacing this with either top level events
-    // or gerrit level events
-
-    // emit the event so change-view can also get updated with latest changes
-    this.dispatchEvent(
-      new CustomEvent('comment-refresh', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    return pluralize(threadsLength, 'comment');
   }
 
   _computeMessageContentExpanded(content?: string, tag?: ReviewInputTag) {
-    return this._computeMessageContent(content, tag, true);
+    return this._computeMessageContent(true, content, tag);
   }
 
   _patchsetCommentSummary(commentThreads: CommentThread[] = []) {
@@ -272,18 +258,38 @@
     tag?: ReviewInputTag,
     commentThreads?: CommentThread[]
   ) {
-    const summary = this._computeMessageContent(content, tag, false);
+    const summary = this._computeMessageContent(false, content, tag);
     if (summary || !commentThreads) return summary;
     return this._patchsetCommentSummary(commentThreads);
   }
 
+  _isNewPatchsetTag(tag?: ReviewInputTag) {
+    return tag?.endsWith(':newPatchSet') || tag?.endsWith(':newWipPatchSet');
+  }
+
+  _handleViewPatchsetDiff(e: Event) {
+    if (!this.message || !this.change) return;
+    const match = this.message.message.match(/Uploaded patch set (\d+)./);
+    if (!match || match.length < 1) return;
+    const patchNum = Number(match[1]);
+    if (isNaN(patchNum)) throw new Error('invalid patchnum in message');
+    GerritNav.navigateToChange(
+      this.change,
+      patchNum as PatchSetNum,
+      (patchNum === 1 ? 'PARENT' : patchNum - 1) as PatchSetNum
+    );
+    // stop propagation to stop message expansion
+    e.stopPropagation();
+  }
+
   _computeMessageContent(
-    content = '',
-    tag: ReviewInputTag = '' as ReviewInputTag,
-    isExpanded: boolean
+    isExpanded: boolean,
+    content?: string,
+    tag?: ReviewInputTag
   ) {
-    const isNewPatchSet =
-      tag.endsWith(':newPatchSet') || tag.endsWith(':newWipPatchSet');
+    if (!content) return '';
+    const isNewPatchSet = this._isNewPatchsetTag(tag);
+
     const lines = content.split('\n');
     const filteredLines = lines.filter(line => {
       if (!isExpanded && line.startsWith('>')) {
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 64fc384..57beacf 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
@@ -111,13 +111,16 @@
       right: var(--spacing-l);
       top: var(--spacing-m);
     }
-    .dateContainer .patchset {
+    .dateContainer gr-button {
       margin-right: var(--spacing-m);
       color: var(--deemphasized-text-color);
     }
     .dateContainer .patchset:before {
       content: 'Patchset ';
     }
+    .dateContainer .patchsetDiffButton {
+      margin-right: var(--spacing-m);
+    }
     span.date {
       color: var(--deemphasized-text-color);
     }
@@ -253,7 +256,6 @@
               change-num="[[changeNum]]"
               logged-in="[[_loggedIn]]"
               hide-toggle-buttons
-              on-thread-list-modified="_onThreadListModified"
             >
             </gr-thread-list>
           </template>
@@ -276,6 +278,11 @@
         </div>
       </template>
       <span class="dateContainer">
+        <template is="dom-if" if="[[_isNewPatchsetTag(message.tag)]]">
+          <gr-button on-click="_handleViewPatchsetDiff" link>
+            View Diff
+          </gr-button>
+        </template>
         <template is="dom-if" if="[[message._revision_number]]">
           <span class="patchset">[[message._revision_number]]</span>
         </template>
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message_test.js b/polygerrit-ui/app/elements/change/gr-message/gr-message_test.js
index 8825d15..94507e6 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message_test.js
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message_test.js
@@ -17,6 +17,7 @@
 
 import '../../../test/common-test-setup-karma.js';
 import './gr-message.js';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
 
 const basicFixture = fixtureFromElement('gr-message');
 
@@ -228,20 +229,59 @@
       assert.deepEqual(stub.lastCall.args[0].detail, {id: element.message.id});
     });
 
+    suite('uploaded patchset X message navigates to X - 1 vs  X', () => {
+      let navStub;
+      setup(() => {
+        element.change = {changeNum: 12345};
+        navStub = sinon.stub(GerritNav, 'navigateToChange');
+      });
+
+      test('Patchset 1 navigates to Base', () => {
+        element.message = {
+          message: 'Uploaded patch set 1.',
+        };
+        element._handleViewPatchsetDiff(new MouseEvent('click'));
+        assert.isTrue(navStub.calledWithExactly({changeNum: 12345}, 1,
+            'PARENT'));
+      });
+
+      test('Patchset X navigates to X vs X - 1', () => {
+        element.message = {
+          message: 'Uploaded patch set 2.',
+        };
+        element._handleViewPatchsetDiff(new MouseEvent('click'));
+        assert.isTrue(navStub.calledWithExactly({changeNum: 12345}, 2, 1));
+
+        element.message = {
+          message: 'Uploaded patch set 200.',
+        };
+        element._handleViewPatchsetDiff(new MouseEvent('click'));
+        assert.isTrue(navStub.calledWithExactly({changeNum: 12345}, 200, 199));
+      });
+
+      test('invalid patchset does not cause navigation', () => {
+        element.message = {
+          message: 'Uploaded patch set XYZ.',
+        };
+        element._handleViewPatchsetDiff(new MouseEvent('click'));
+        assert.isFalse(navStub.called);
+      });
+    });
+
     suite('compute messages', () => {
       test('empty', () => {
-        assert.equal(element._computeMessageContent('', '', true), '');
-        assert.equal(element._computeMessageContent('', '', false), '');
+        assert.equal(element._computeMessageContent(true, '', ''), '');
+        assert.equal(element._computeMessageContent(false, '', ''), '');
       });
 
       test('new patchset', () => {
         const original = 'Uploaded patch set 1.';
         const tag = 'autogenerated:gerrit:newPatchSet';
-        let actual = element._computeMessageContent(original, tag, true);
+        let actual = element._computeMessageContent(true, original, tag);
         assert.equal(actual, element._computeMessageContentCollapsed(
             original, tag, []));
         assert.equal(actual, original);
-        actual = element._computeMessageContent(original, tag, false);
+        actual = element._computeMessageContent(false, original, tag);
         assert.equal(actual, original);
       });
 
@@ -249,11 +289,11 @@
         const original = 'Patch Set 27: Patch Set 26 was rebased';
         const tag = 'autogenerated:gerrit:newPatchSet';
         const expected = 'Patch Set 26 was rebased';
-        let actual = element._computeMessageContent(original, tag, true);
+        let actual = element._computeMessageContent(true, original, tag);
         assert.equal(actual, expected);
         assert.equal(actual, element._computeMessageContentCollapsed(
             original, tag, []));
-        actual = element._computeMessageContent(original, tag, false);
+        actual = element._computeMessageContent(false, original, tag);
         assert.equal(actual, expected);
       });
 
@@ -261,11 +301,11 @@
         const original = 'Patch Set 1:\n\nThis change is ready for review.';
         const tag = undefined;
         const expected = 'This change is ready for review.';
-        let actual = element._computeMessageContent(original, tag, true);
+        let actual = element._computeMessageContent(true, original, tag);
         assert.equal(actual, expected);
         assert.equal(actual, element._computeMessageContentCollapsed(
             original, tag, []));
-        actual = element._computeMessageContent(original, tag, false);
+        actual = element._computeMessageContent(false, original, tag);
         assert.equal(actual, expected);
       });
 
@@ -273,9 +313,9 @@
         const original = 'Patch Set 1: Code-Style+1';
         const tag = undefined;
         const expected = '';
-        let actual = element._computeMessageContent(original, tag, true);
+        let actual = element._computeMessageContent(true, original, tag);
         assert.equal(actual, expected);
-        actual = element._computeMessageContent(original, tag, false);
+        actual = element._computeMessageContent(false, original, tag);
         assert.equal(actual, expected);
       });
 
@@ -283,9 +323,9 @@
         const original = 'Patch Set 1:\n\n(3 comments)';
         const tag = undefined;
         const expected = '';
-        let actual = element._computeMessageContent(original, tag, true);
+        let actual = element._computeMessageContent(true, original, tag);
         assert.equal(actual, expected);
-        actual = element._computeMessageContent(original, tag, false);
+        actual = element._computeMessageContent(false, original, tag);
         assert.equal(actual, expected);
       });
     });
@@ -433,7 +473,7 @@
       }];
       assert.equal(element._computeMessageContentCollapsed(
           '', undefined, threads), 'testing the load');
-      assert.equal(element._computeMessageContent('', undefined, false), '');
+      assert.equal(element._computeMessageContent(false, '', undefined), '');
     });
 
     test('single patchset comment with reply', () => {
@@ -464,7 +504,7 @@
       }];
       assert.equal(element._computeMessageContentCollapsed(
           '', undefined, threads), 'n');
-      assert.equal(element._computeMessageContent('', undefined, false), '');
+      assert.equal(element._computeMessageContent(false, '', undefined), '');
     });
   });
 
diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts
index d3a72072..e1ef3f8 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list_html.ts
@@ -24,7 +24,6 @@
     }
     .header {
       align-items: center;
-      border-top: 1px solid var(--border-color);
       border-bottom: 1px solid var(--border-color);
       display: flex;
       justify-content: space-between;
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 42bf1e9..fc6b5ba 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
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import '../../plugins/gr-endpoint-decorator/gr-endpoint-decorator';
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
@@ -43,6 +42,7 @@
 } from '../../../types/common';
 import {ParsedChangeInfo} from '../../shared/gr-rest-api-interface/gr-reviewer-updates-parser';
 import {appContext} from '../../../services/app-context';
+import {pluralize} from '../../../utils/string-util';
 
 function getEmptySubmitTogetherInfo(): SubmittedTogetherInfo {
   return {changes: [], non_visible_changes: 0};
@@ -451,8 +451,7 @@
   }
 
   _computeNonVisibleChangesNote(n: number) {
-    const noun = n === 1 ? 'change' : 'changes';
-    return `(+ ${n} non-visible ${noun})`;
+    return `(+ ${pluralize(n, 'non-visible change')})`;
   }
 }
 
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 d0d0745..b92f179 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
@@ -22,7 +22,6 @@
 import '../../shared/gr-formatted-text/gr-formatted-text';
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-storage/gr-storage';
 import '../../shared/gr-account-list/gr-account-list';
 import '../gr-label-scores/gr-label-scores';
@@ -43,7 +42,6 @@
   ReviewerState,
   SpecialFilePath,
 } from '../../../constants/constants';
-import {KnownExperimentId} from '../../../services/flags/flags';
 import {fetchChangeUpdates} from '../../../utils/patch-set-util';
 import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 import {accountKey, removeServiceUsers} from '../../../utils/account-util';
@@ -107,7 +105,8 @@
 import {isAttentionSetEnabled} from '../../../utils/attention-set-util';
 import {CODE_REVIEW, getMaxAccounts} from '../../../utils/label-util';
 import {isUnresolved} from '../../../utils/comment-util';
-import {fireAlert} from '../../../utils/event-util';
+import {pluralize} from '../../../utils/string-util';
+import {fireAlert, fireEvent, fireServerError} from '../../../utils/event-util';
 
 const STORAGE_DEBOUNCE_INTERVAL_MS = 400;
 
@@ -138,6 +137,7 @@
   SAVE: 'Save but do not send notification or change review state',
   START_REVIEW: 'Mark as ready for review and send reply',
   SEND: 'Send reply',
+  DISABLED_COMMENT_EDITING: 'Save draft comments to enable send',
 };
 
 const EMPTY_REPLY_MESSAGE = 'Cannot send an empty reply.';
@@ -379,8 +379,6 @@
     };
   }
 
-  _isPatchsetCommentsExperimentEnabled = false;
-
   constructor() {
     super();
     this.filterReviewerSuggestion = this._filterReviewerSuggestionGenerator(
@@ -420,9 +418,6 @@
   /** @override */
   ready() {
     super.ready();
-    this._isPatchsetCommentsExperimentEnabled = this.flagsService.isEnabled(
-      KnownExperimentId.PATCHSET_COMMENTS
-    );
     this.$.jsAPI.addElement(TargetElement.REPLY_DIALOG, this);
   }
 
@@ -447,12 +442,7 @@
     if (this.restApiService.hasPendingDiffDrafts()) {
       this._savingComments = true;
       this.restApiService.awaitPendingDiffDrafts().then(() => {
-        this.dispatchEvent(
-          new CustomEvent('comment-refresh', {
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireEvent(this, 'comment-refresh');
         this._savingComments = false;
       });
     }
@@ -561,7 +551,7 @@
     for (const splice of indexSplices) {
       for (const account of splice.removed) {
         if (!this._reviewersPendingRemove[type]) {
-          console.error('Invalid type ' + type + ' for reviewer.');
+          this.reporting.error(new Error(`Invalid type ${type} for reviewer.`));
           return;
         }
         this._reviewersPendingRemove[type].push(account);
@@ -679,17 +669,13 @@
     }
 
     if (this.draft) {
-      if (this._isPatchsetCommentsExperimentEnabled) {
-        const comment: CommentInput = {
-          message: this.draft,
-          unresolved: !this._isResolvedPatchsetLevelComment,
-        };
-        reviewInput.comments = {
-          [SpecialFilePath.PATCHSET_LEVEL_COMMENTS]: [comment],
-        };
-      } else {
-        reviewInput.message = this.draft;
-      }
+      const comment: CommentInput = {
+        message: this.draft,
+        unresolved: !this._isResolvedPatchsetLevelComment,
+      };
+      reviewInput.comments = {
+        [SpecialFilePath.PATCHSET_LEVEL_COMMENTS]: [comment],
+      };
     }
 
     const accountAdditions = new Map<AccountId | EmailAddress, boolean>();
@@ -722,13 +708,7 @@
           return new Map<AccountId | EmailAddress, boolean>();
         }
         if (!response.ok) {
-          this.dispatchEvent(
-            new CustomEvent('server-error', {
-              detail: {response},
-              composed: true,
-              bubbles: true,
-            })
-          );
+          fireServerError(response);
           return new Map<AccountId | EmailAddress, boolean>();
         }
 
@@ -791,8 +771,9 @@
     return account._account_id === change.owner._account_id;
   }
 
-  _handle400Error(response?: Response | null) {
-    if (!response) throw new Error('Reponse is empty.');
+  _handle400Error(r?: Response | null) {
+    if (!r) throw new Error('Reponse is empty.');
+    let response: Response = r;
     // A call to _saveReview could fail with a server error if erroneous
     // reviewers were requested. This is signalled with a 400 Bad Request
     // status. The default gr-rest-api-interface error handling would
@@ -814,7 +795,7 @@
       const result = parsed as ReviewResult;
       // Only perform custom error handling for 400s and a parseable
       // ReviewResult response.
-      if (response && response.status === 400 && result && result.reviewers) {
+      if (response.status === 400 && result && result.reviewers) {
         const errors: string[] = [];
         const addReviewers = Object.values(result.reviewers);
         addReviewers.forEach(r => errors.push(r.error ?? 'no explanation'));
@@ -824,13 +805,7 @@
           text: () => Promise.resolve(errors.join(', ')),
         };
       }
-      this.dispatchEvent(
-        new CustomEvent('server-error', {
-          detail: {response},
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireServerError(response);
     });
   }
 
@@ -840,13 +815,7 @@
 
   _computeDraftsTitle(draftCommentThreads?: CommentThread[]) {
     const total = draftCommentThreads ? draftCommentThreads.length : 0;
-    if (total === 0) {
-      return '';
-    }
-    if (total === 1) {
-      return '1 Draft';
-    }
-    return `${total} Drafts`;
+    return pluralize(total, 'Draft');
   }
 
   _computeMessagePlaceholder(canBeStarted: boolean) {
@@ -905,9 +874,7 @@
   _onAttentionExpandedChange() {
     // If the attention-detail section is expanded without dispatching this
     // event, then the dialog may expand beyond the screen's bottom border.
-    this.dispatchEvent(
-      new CustomEvent('iron-resize', {composed: true, bubbles: true})
-    );
+    fireEvent(this, 'iron-resize');
   }
 
   _showAttentionSummary(config?: ServerInfo, attentionExpanded?: boolean) {
@@ -1120,8 +1087,11 @@
     if (containsAll(currentAttentionSet, newAttentionSet)) {
       return 'No additions to the attention set.';
     }
-    console.error(
-      '_computeDoNotUpdateMessage() should not be called when users were added to the attention set.'
+    this.reporting.error(
+      new Error(
+        '_computeDoNotUpdateMessage()' +
+          'should not be called when users were added to the attention set.'
+      )
     );
     return '';
   }
@@ -1318,7 +1288,9 @@
       this._focusOn(FocusTarget.REVIEWERS);
       return;
     }
-    console.error('_confirmPendingReviewer called without pending confirm');
+    this.reporting.error(
+      new Error('_confirmPendingReviewer called without pending confirm')
+    );
   }
 
   _cancelPendingReviewer() {
@@ -1373,12 +1345,7 @@
   }
 
   _handleHeightChanged() {
-    this.dispatchEvent(
-      new CustomEvent('autogrow', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'autogrow');
   }
 
   _handleLabelsChanged() {
@@ -1407,7 +1374,10 @@
       : ButtonLabels.SEND;
   }
 
-  _computeSendButtonTooltip(canBeStarted: boolean) {
+  _computeSendButtonTooltip(canBeStarted?: boolean, commentEditing?: boolean) {
+    if (commentEditing) {
+      return ButtonTooltips.DISABLED_COMMENT_EDITING;
+    }
     return canBeStarted ? ButtonTooltips.START_REVIEW : ButtonTooltips.SEND;
   }
 
@@ -1483,20 +1453,6 @@
     return provider;
   }
 
-  _onThreadListModified() {
-    // TODO(taoalpha): this won't propogate the changes to the files
-    // should consider replacing this with either top level events
-    // or gerrit level events
-
-    // emit the event so change-view can also get updated with latest changes
-    this.dispatchEvent(
-      new CustomEvent('comment-refresh', {
-        composed: true,
-        bubbles: true,
-      })
-    );
-  }
-
   reportAttentionSetChanges(
     modified: boolean,
     addedSet?: AttentionSetInput[],
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 45c4799..15e461a 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
@@ -303,16 +303,14 @@
       </gr-endpoint-decorator>
     </section>
     <section class="previewContainer">
-      <template is="dom-if" if="[[_isPatchsetCommentsExperimentEnabled]]">
-        <label>
-          <input
-            id="resolvedPatchsetLevelCommentCheckbox"
-            type="checkbox"
-            checked="{{_isResolvedPatchsetLevelComment::change}}"
-          />
-          Resolved
-        </label>
-      </template>
+      <label>
+        <input
+          id="resolvedPatchsetLevelCommentCheckbox"
+          type="checkbox"
+          checked="{{_isResolvedPatchsetLevelComment::change}}"
+        />
+        Resolved
+      </label>
       <label class="preview-formatting">
         <input type="checkbox" checked="{{_previewFormatting::change}}" />
         Preview formatting
@@ -357,7 +355,6 @@
         change-num="[[change._number]]"
         logged-in="true"
         hide-toggle-buttons=""
-        on-thread-list-modified="_onThreadListModified"
       >
       </gr-thread-list>
       <span
@@ -608,7 +605,7 @@
             disabled="[[_sendDisabled]]"
             class="action send"
             has-tooltip=""
-            title$="[[_computeSendButtonTooltip(canBeStarted)]]"
+            title$="[[_computeSendButtonTooltip(canBeStarted, _commentEditing)]]"
             on-click="_sendTapHandler"
             >[[_sendButtonLabel]]</gr-button
           >
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js
index a606624..09f8636 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_test.js
@@ -21,6 +21,7 @@
 import {mockPromise} from '../../../test/test-utils.js';
 import {SpecialFilePath} from '../../../constants/constants.js';
 import {appContext} from '../../../services/app-context.js';
+import {addListenerForTest} from '../../../test/test-utils.js';
 
 const basicFixture = fixtureFromElement('gr-reply-dialog');
 
@@ -778,23 +779,23 @@
     assert.isTrue(eraseDraftCommentStub.calledWith(location));
   });
 
-  test('400 converts to human-readable server-error', async () => {
+  test('400 converts to human-readable server-error', done => {
     sinon.stub(window, 'fetch').callsFake(() => {
       const text = '....{"reviewers":{"id1":{"error":"human readable"}}}';
       return Promise.resolve(cloneableResponse(400, text));
     });
 
-    let resolver;
-    const promise = new Promise(r => resolver = r);
-    element.addEventListener('server-error', resolver);
+    const listener = event => {
+      if (event.target !== document) return;
+      event.detail.response.text().then(body => {
+        if (body === 'human readable') {
+          done();
+        }
+      });
+    };
+    addListenerForTest(document, 'server-error', listener);
 
-    await flush();
-    element.send();
-
-    const event = await promise;
-    assert.equal(event.target, element);
-    const text = await event.detail.response.text();
-    assert.equal(text, 'human readable');
+    flush(() => { element.send(); });
   });
 
   test('non-json 400 is treated as a normal server-error', done => {
@@ -803,15 +804,15 @@
       return Promise.resolve(cloneableResponse(400, text));
     });
 
-    element.addEventListener('server-error', event => {
-      if (event.target !== element) {
-        return;
-      }
+    const listener = event => {
+      if (event.target !== document) return;
       event.detail.response.text().then(body => {
-        assert.equal(body, 'Comment validation error!');
-        done();
+        if (body === 'Comment validation error!') {
+          done();
+        }
       });
-    });
+    };
+    addListenerForTest(document, 'server-error', listener);
 
     // Async tick is needed because iron-selector content is distributed and
     // distributed content requires an observer to be set up.
@@ -1255,12 +1256,13 @@
         },
       },
     });
-    element.addEventListener('server-error', e => {
+    const listener = e => {
       e.detail.response.text().then(text => {
         assert.equal(text, [error1, error2, error3].join(', '));
         done();
       });
-    });
+    };
+    addListenerForTest(document, 'server-error', listener);
     element._handle400Error(cloneableResponse(400, text));
   });
 
@@ -1278,36 +1280,6 @@
     });
   });
 
-  suite('post review API', () => {
-    let startReviewStub;
-
-    setup(() => {
-      startReviewStub = sinon.stub(
-          element.restApiService,
-          'startReview')
-          .callsFake(() => Promise.resolve());
-    });
-
-    test('ready property in review input on start review', () => {
-      stubSaveReview(review => {
-        assert.isTrue(review.ready);
-        return {ready: true};
-      });
-      return element.send(true, true).then(() => {
-        assert.isFalse(startReviewStub.called);
-      });
-    });
-
-    test('no ready property in review input on save review', () => {
-      stubSaveReview(review => {
-        assert.isUndefined(review.ready);
-      });
-      return element.send(true, false).then(() => {
-        assert.isFalse(startReviewStub.called);
-      });
-    });
-  });
-
   suite('start review and save buttons', () => {
     let sendStub;
 
diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.ts b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.ts
index 33ac51f..254ecca 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.ts
@@ -16,7 +16,6 @@
  */
 import '../../shared/gr-account-chip/gr-account-chip';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
@@ -43,6 +42,7 @@
 import {isRemovableReviewer} from '../../../utils/change-util';
 import {ReviewerState} from '../../../constants/constants';
 import {appContext} from '../../../services/app-context';
+import {KnownExperimentId} from '../../../services/flags/flags';
 
 @customElement('gr-reviewer-list')
 export class GrReviewerList extends GestureEventListeners(
@@ -88,8 +88,21 @@
   @property({type: Object})
   _xhrPromise?: Promise<Response | undefined>;
 
+  @property({type: Boolean})
+  _isNewChangeSummaryUiEnabled = false;
+
   private readonly restApiService = appContext.restApiService;
 
+  private readonly flagsService = appContext.flagsService;
+
+  /** @override */
+  ready() {
+    super.ready();
+    this._isNewChangeSummaryUiEnabled = this.flagsService.isEnabled(
+      KnownExperimentId.NEW_CHANGE_SUMMARY_UI
+    );
+  }
+
   @computed('ccsOnly')
   get _addLabel() {
     return this.ccsOnly ? 'Add CC' : 'Add reviewer';
diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
index dd18d03..ccdcf8d 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
@@ -28,6 +28,16 @@
     .container {
       display: block;
     }
+    .addReviewer iron-icon {
+      color: inherit;
+      --iron-icon-height: 18px;
+      --iron-icon-width: 18px;
+    }
+    gr-button.addReviewer.new-change-summary-true {
+      --padding: 1px 4px;
+      vertical-align: top;
+      top: 1px;
+    }
     gr-button {
       --gr-button: {
         padding: 0px 0px;
@@ -51,6 +61,16 @@
         >
         </gr-account-chip>
       </template>
+      <template is="dom-if" if="[[_isNewChangeSummaryUiEnabled]]">
+        <gr-button
+          link=""
+          id="addReviewer"
+          class="addReviewer new-change-summary-true"
+          on-click="_handleAddTap"
+          title="[[_addLabel]]"
+          ><iron-icon icon="gr-icons:edit"></iron-icon
+        ></gr-button>
+      </template>
     </div>
     <gr-button
       class="hiddenReviewers"
@@ -59,14 +79,16 @@
       on-click="_handleViewAll"
       >and [[_hiddenReviewerCount]] more</gr-button
     >
-    <div class="controlsContainer" hidden$="[[!mutable]]">
-      <gr-button
-        link=""
-        id="addReviewer"
-        class="addReviewer"
-        on-click="_handleAddTap"
-        >[[_addLabel]]</gr-button
-      >
-    </div>
+    <template is="dom-if" if="[[!_isNewChangeSummaryUiEnabled]]">
+      <div class="controlsContainer" hidden$="[[!mutable]]">
+        <gr-button
+          link=""
+          id="addReviewer"
+          class="addReviewer"
+          on-click="_handleAddTap"
+          >[[_addLabel]]</gr-button
+        >
+      </div>
+    </template>
   </div>
 `;
diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_test.js b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_test.js
index d29abfc..89332c2 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_test.js
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_test.js
@@ -36,6 +36,7 @@
   });
 
   test('controls hidden on immutable element', () => {
+    flush();
     element.mutable = false;
     assert.isTrue(element.shadowRoot
         .querySelector('.controlsContainer').hasAttribute('hidden'));
@@ -48,6 +49,7 @@
     element.addEventListener('show-reply-dialog', () => {
       done();
     });
+    flush();
     MockInteractions.tap(element.shadowRoot
         .querySelector('.addReviewer'));
   });
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 6a32834..4976503 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
@@ -32,6 +32,8 @@
 } from '@polymer/polymer/interfaces';
 import {ChangeInfo} from '../../../types/common';
 import {CommentThread, isDraft, UIRobot} from '../../../utils/comment-util';
+import {pluralize} from '../../../utils/string-util';
+import {fireThreadListModifiedEvent} from '../../../utils/event-util';
 
 interface CommentThreadWithInfo {
   thread: CommentThread;
@@ -116,10 +118,7 @@
     unresolvedOnly: boolean
   ) {
     if (unresolvedOnly && threads.length && !displayedThreads.length) {
-      return (
-        `Show ${threads.length} resolved comment` +
-        (threads.length > 1 ? 's' : '')
-      );
+      return `Show ${pluralize(threads.length, 'resolved comment')}`;
     }
     return '';
   }
@@ -161,7 +160,9 @@
     if (c1.thread.patchNum !== c2.thread.patchNum) {
       if (!c1.thread.patchNum) return 1;
       if (!c2.thread.patchNum) return -1;
-      // TODO(TS): Explicit comparison for 'edit' and 'PARENT' missing?
+      // Threads left on Base when comparing Base vs X have patchNum = X
+      // and CommentSide = PARENT
+      // Threads left on 'edit' have patchNum set as latestPatchNum
       return c1.thread.patchNum > c2.thread.patchNum ? -1 : 1;
     }
 
@@ -399,7 +400,7 @@
       hasRobotComment,
       hasHumanReplyToRobotComment,
       unresolved: !!lastComment && !!lastComment.unresolved,
-      isEditing: !!lastComment && !!lastComment.__editing,
+      isEditing: isDraft(lastComment) && !!lastComment.__editing,
       hasDraft: !!lastComment && isDraft(lastComment),
       updated,
     };
@@ -421,11 +422,7 @@
   }
 
   _handleCommentsChanged(e: CustomEvent) {
-    this.dispatchEvent(
-      new CustomEvent('thread-list-modified', {
-        detail: {rootId: e.detail.rootId, path: e.detail.path},
-      })
-    );
+    fireThreadListModifiedEvent(this, e.detail.rootId, e.detail.path);
   }
 
   _isOnParent(side?: CommentSide) {
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 e62d481..2c21b4a 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
@@ -127,6 +127,7 @@
       </template>
       <gr-comment-thread
         show-file-path=""
+        show-ported-comment="[[thread.ported]]"
         change-num="[[changeNum]]"
         comments="[[thread.comments]]"
         diff-side="[[thread.diffSide]]"
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js
index 945cca9..622e1a2 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js
@@ -568,6 +568,7 @@
     modifiedThreads[5].comments.push({
       ...modifiedThreads[5].comments[0],
       __editing: true,
+      __draft: true,
     });
     element.threads = modifiedThreads;
     MockInteractions.tap(element.shadowRoot.querySelector('#draftToggle'));
diff --git a/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.ts b/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.ts
index 28327a1..d52da80 100644
--- a/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.ts
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 import '../../shared/gr-dialog/gr-dialog';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-shell-command/gr-shell-command';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-tab.ts b/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
index ca73f4f..b94430d 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-tab.ts
@@ -15,8 +15,25 @@
  * limitations under the License.
  */
 import {html} from 'lit-html';
-import {customElement} from 'lit-element';
+import {css, customElement} from 'lit-element';
 import {GrLitElement} from '../lit/gr-lit-element';
+import {
+  CheckResult,
+  CheckRun,
+} from '../plugins/gr-checks-api/gr-checks-api-types';
+import {allResults$, allRuns$} from '../../services/checks/checks-model';
+
+function renderRun(run: CheckRun) {
+  return html`<div>
+    <span>${run.checkName}</span>, <span>${run.status}</span>
+  </div>`;
+}
+
+function renderResult(result: CheckResult) {
+  return html`<div>
+    <span>${result.summary}</span>
+  </div>`;
+}
 
 /**
  * The "Checks" tab on the Gerrit change page. Gets its data from plugins that
@@ -24,8 +41,32 @@
  */
 @customElement('gr-checks-tab')
 export class GrChecksTab extends GrLitElement {
+  runs: CheckRun[] = [];
+
+  results: CheckResult[] = [];
+
+  constructor() {
+    super();
+    this.subscribe('runs', allRuns$);
+    this.subscribe('results', allResults$);
+  }
+
+  static get styles() {
+    return css`
+      :host {
+        display: block;
+        padding: var(--spacing-m);
+      }
+    `;
+  }
+
   render() {
-    return html`<span>Hello Checks!</span>`;
+    return html`
+      <div><h2>Runs</h2></div>
+      ${this.runs.map(renderRun)}
+      <div><h2>Results</h2></div>
+      ${this.results.map(renderResult)}
+    `;
   }
 }
 
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
index 56cb763..0361b9a 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
@@ -16,7 +16,6 @@
  */
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-dropdown/gr-dropdown';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import '../../shared/gr-avatar/gr-avatar';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
@@ -27,6 +26,7 @@
 import {customElement, property} from '@polymer/decorators';
 import {AccountInfo, ServerInfo} from '../../../types/common';
 import {appContext} from '../../../services/app-context';
+import {fireEvent} from '../../../utils/event-util';
 
 const INTERPOLATE_URL_PATTERN = /\${([\w]+)}/g;
 
@@ -116,12 +116,7 @@
   }
 
   _handleShortcutsTap() {
-    this.dispatchEvent(
-      new CustomEvent('show-keyboard-shortcuts', {
-        bubbles: true,
-        composed: true,
-      })
-    );
+    fireEvent(this, 'show-keyboard-shortcuts');
   }
 
   _handleLocationChange() {
diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
index 91a8ebf..e868f03 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
@@ -19,7 +19,6 @@
 import '../gr-error-dialog/gr-error-dialog';
 import '../../shared/gr-alert/gr-alert';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
@@ -35,10 +34,10 @@
 import {GrOverlay} from '../../shared/gr-overlay/gr-overlay';
 import {GrErrorDialog} from '../gr-error-dialog/gr-error-dialog';
 import {GrAlert} from '../../shared/gr-alert/gr-alert';
-import {FetchRequest} from '../../shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper';
 import {ErrorType, FixIronA11yAnnouncer} from '../../../types/types';
 import {AccountId} from '../../../types/common';
 import {EventType} from '../../../utils/event-util';
+import {NetworkErrorEvent, ServerErrorEvent} from '../../../types/events';
 
 const HIDE_ALERT_TIMEOUT_MS = 5000;
 const CHECK_SIGN_IN_INTERVAL_MS = 60 * 1000;
@@ -126,8 +125,8 @@
   /** @override */
   attached() {
     super.attached();
-    this.listen(document, 'server-error', '_handleServerError');
-    this.listen(document, 'network-error', '_handleNetworkError');
+    this.listen(document, EventType.SERVER_ERROR, '_handleServerError');
+    this.listen(document, EventType.NETWORK_ERROR, '_handleNetworkError');
     this.listen(document, EventType.SHOW_ALERT, '_handleShowAlert');
     this.listen(document, 'hide-alert', '_hideAlert');
     this.listen(document, 'show-error', '_handleShowErrorDialog');
@@ -148,8 +147,8 @@
   detached() {
     super.detached();
     this._clearHideAlertHandle();
-    this.unlisten(document, 'server-error', '_handleServerError');
-    this.unlisten(document, 'network-error', '_handleNetworkError');
+    this.unlisten(document, EventType.SERVER_ERROR, '_handleServerError');
+    this.unlisten(document, EventType.NETWORK_ERROR, '_handleNetworkError');
     this.unlisten(document, EventType.SHOW_ALERT, '_handleShowAlert');
     this.unlisten(document, 'hide-alert', '_hideAlert');
     this.unlisten(document, 'show-error', '_handleShowErrorDialog');
@@ -178,9 +177,7 @@
     });
   }
 
-  _handleServerError(
-    e: CustomEvent<{response: Response; request: FetchRequest}>
-  ) {
+  _handleServerError(e: ServerErrorEvent) {
     const {request, response} = e.detail;
     response.text().then(errorText => {
       const url = request && (request.anonymizedUrl || request.url);
@@ -297,7 +294,7 @@
     );
   }
 
-  _handleNetworkError(e: CustomEvent) {
+  _handleNetworkError(e: NetworkErrorEvent) {
     this._showAlert('Server unavailable');
     console.error(e.detail.error.message);
   }
diff --git a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.css.ts b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.css.ts
new file mode 100644
index 0000000..ccba289
--- /dev/null
+++ b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.css.ts
@@ -0,0 +1,30 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {css} from 'lit-element';
+
+export const cssTemplate = css`
+  .key {
+    background-color: var(--chip-background-color);
+    color: var(--primary-text-color);
+    border: 1px solid var(--border-color);
+    border-radius: var(--border-radius);
+    display: inline-block;
+    font-weight: var(--font-weight-bold);
+    padding: var(--spacing-xxs) var(--spacing-m);
+    text-align: center;
+  }
+`;
diff --git a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.ts b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.ts
index 796a167..091684f 100644
--- a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.ts
+++ b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.ts
@@ -14,12 +14,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../../styles/shared-styles';
-import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
-import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-key-binding-display_html';
-import {customElement, property} from '@polymer/decorators';
+import {html} from 'lit-html';
+import {GrLitElement} from '../../lit/gr-lit-element';
+import {customElement, property} from 'lit-element';
+import {cssTemplate} from './gr-key-binding-display.css';
+import {sharedStyles} from '../../../styles/shared-styles';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -28,21 +27,30 @@
 }
 
 @customElement('gr-key-binding-display')
-export class GrKeyBindingDisplay extends GestureEventListeners(
-  LegacyElementMixin(PolymerElement)
-) {
-  static get template() {
-    return htmlTemplate;
+export class GrKeyBindingDisplay extends GrLitElement {
+  static get styles() {
+    return [sharedStyles, cssTemplate];
+  }
+
+  render() {
+    const items = this.binding.map((binding, index) => [
+      index > 0 ? html` or ` : html``,
+      this._computeModifiers(binding).map(
+        modifier => html`<span class="key modifier">${modifier}</span> `
+      ),
+      html`<span class="key">${this._computeKey(binding)}</span>`,
+    ]);
+    return html`${items}`;
   }
 
   @property({type: Array})
   binding: string[][] = [];
 
-  _computeModifiers(binding: string[][]) {
+  _computeModifiers(binding: string[]) {
     return binding.slice(0, binding.length - 1);
   }
 
-  _computeKey(binding: string[][]) {
+  _computeKey(binding: string[]) {
     return binding[binding.length - 1];
   }
 }
diff --git a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts
deleted file mode 100644
index 251e30f..0000000
--- a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_html.ts
+++ /dev/null
@@ -1,41 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style include="shared-styles">
-    .key {
-      background-color: var(--chip-background-color);
-      color: var(--primary-text-color);
-      border: 1px solid var(--border-color);
-      border-radius: var(--border-radius);
-      display: inline-block;
-      font-weight: var(--font-weight-bold);
-      padding: var(--spacing-xxs) var(--spacing-m);
-      text-align: center;
-    }
-  </style>
-  <template is="dom-repeat" items="[[binding]]">
-    <template is="dom-if" if="[[index]]">
-      or
-    </template>
-    <template is="dom-repeat" items="[[_computeModifiers(item)]]" as="modifier">
-      <span class="key modifier">[[modifier]]</span>
-    </template>
-    <span class="key">[[_computeKey(item)]]</span>
-  </template>
-`;
diff --git a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_test.js b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_test.ts
similarity index 86%
rename from polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_test.js
rename to polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_test.ts
index 0c25e6e..875cde8 100644
--- a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_test.js
+++ b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display_test.ts
@@ -17,11 +17,12 @@
 
 import '../../../test/common-test-setup-karma.js';
 import './gr-key-binding-display.js';
+import {GrKeyBindingDisplay} from './gr-key-binding-display.js';
 
 const basicFixture = fixtureFromElement('gr-key-binding-display');
 
 suite('gr-key-binding-display tests', () => {
-  let element;
+  let element: GrKeyBindingDisplay;
 
   setup(() => {
     element = basicFixture.instantiate();
@@ -45,10 +46,10 @@
 
     test('key with modifiers', () => {
       assert.deepEqual(element._computeModifiers(['Ctrl', 'x']), ['Ctrl']);
-      assert.deepEqual(
-          element._computeModifiers(['Shift', 'Meta', 'x']),
-          ['Shift', 'Meta']);
+      assert.deepEqual(element._computeModifiers(['Shift', 'Meta', 'x']), [
+        'Shift',
+        'Meta',
+      ]);
     });
   });
 });
-
diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts
index f1b9ea1..2482497 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.ts
@@ -18,7 +18,6 @@
 import '../../shared/gr-dropdown/gr-dropdown';
 import '../../shared/gr-icons/gr-icons';
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-account-dropdown/gr-account-dropdown';
 import '../gr-smart-search/gr-smart-search';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts b/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts
index 8470611..83bf3ca 100644
--- a/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts
+++ b/polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.ts
@@ -16,23 +16,24 @@
  */
 import {
   BranchName,
+  ChangeConfigInfo,
   ChangeInfo,
+  CommentLinks,
+  CommitId,
+  DashboardId,
+  EditPatchSetNum,
+  GroupId,
+  Hashtag,
+  NumericChangeId,
+  ParentPatchSetNum,
   PatchSetNum,
   RepoName,
-  TopicName,
-  GroupId,
-  DashboardId,
-  NumericChangeId,
-  EditPatchSetNum,
-  ChangeConfigInfo,
-  CommitId,
-  Hashtag,
-  UrlEncodedCommentId,
-  CommentLinks,
-  ParentPatchSetNum,
   ServerInfo,
+  TopicName,
+  UrlEncodedCommentId,
 } from '../../../types/common';
 import {ParsedChangeInfo} from '../../shared/gr-rest-api-interface/gr-reviewer-updates-parser';
+import {GerritView} from '../../../services/router/router-model';
 
 // Navigation parameters object format:
 //
@@ -396,22 +397,6 @@
   url?: string;
 }
 
-export enum GerritView {
-  ADMIN = 'admin',
-  AGREEMENTS = 'agreements',
-  CHANGE = 'change',
-  DASHBOARD = 'dashboard',
-  DIFF = 'diff',
-  DOCUMENTATION_SEARCH = 'documentation-search',
-  EDIT = 'edit',
-  GROUP = 'group',
-  PLUGIN_SCREEN = 'plugin-screen',
-  REPO = 'repo',
-  ROOT = 'root',
-  SEARCH = 'search',
-  SETTINGS = 'settings',
-}
-
 export enum GroupDetailView {
   MEMBERS = 'members',
   LOG = 'log',
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index a1909c8..07045cd 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
@@ -27,6 +26,7 @@
 import {encodeURL, getBaseUrl} from '../../../utils/url-util';
 import {
   DashboardSection,
+  GeneratedWebLink,
   GenerateUrlChangeViewParameters,
   GenerateUrlDashboardViewParameters,
   GenerateUrlDiffViewParameters,
@@ -39,18 +39,16 @@
   GenerateWebLinksFileParameters,
   GenerateWebLinksParameters,
   GenerateWebLinksPatchsetParameters,
-  GerritView,
+  GerritNav,
+  GroupDetailView,
   isGenerateUrlDiffViewParameters,
   RepoDetailView,
   WeblinkType,
-  GroupDetailView,
-  GerritNav,
-  GeneratedWebLink,
 } from '../gr-navigation/gr-navigation';
 import {appContext} from '../../../services/app-context';
 import {
-  patchNumEquals,
   convertToPatchSetNum,
+  patchNumEquals,
 } from '../../../utils/patch-set-util';
 import {customElement, property} from '@polymer/decorators';
 import {assertNever} from '../../../utils/common-util';
@@ -65,10 +63,11 @@
 } from '../../../types/common';
 import {
   AppElement,
-  AppElementParams,
   AppElementAgreementParam,
+  AppElementParams,
 } from '../../gr-app-types';
 import {LocationChangeEventDetail} from '../../../types/events';
+import {GerritView, updateState} from '../../../services/router/router-model';
 
 const RoutePattern = {
   ROOT: '/',
@@ -309,8 +308,13 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly changeService = appContext.changeService;
+
   constructor() {
     super();
+    // TODO: This is just an artificical dependdency such that the service is
+    // instantiated and its observables subscribed. Remove this later.
+    this.changeService.dontDoAnything();
   }
 
   start() {
@@ -321,6 +325,11 @@
   }
 
   _setParams(params: AppElementParams | GenerateUrlParameters) {
+    updateState(
+      params.view,
+      'changeNum' in params ? params.changeNum : undefined,
+      'patchNum' in params ? params.patchNum ?? undefined : undefined
+    );
     this._appElement().params = params;
   }
 
@@ -790,7 +799,9 @@
     authRedirect?: boolean
   ) {
     if (!this[handlerName]) {
-      console.error('Attempted to map route to unknown method: ', handlerName);
+      this.reporting.error(
+        new Error(`Attempted to map route to unknown method: ${handlerName}`)
+      );
       return;
     }
     page(
@@ -1534,8 +1545,7 @@
     // Parameter order is based on the regex group number matched.
     const params: GenerateUrlChangeViewParameters = {
       project: ctx.params[0] as RepoName,
-      // TODO(TS): remove as unknown
-      changeNum: (ctx.params[1] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[1]) as NumericChangeId,
       basePatchNum: convertToPatchSetNum(ctx.params[4]),
       patchNum: convertToPatchSetNum(ctx.params[6]),
       view: GerritView.CHANGE,
@@ -1549,7 +1559,7 @@
   _handleCommentRoute(ctx: PageContextWithQueryMap) {
     const params: GenerateUrlDiffViewParameters = {
       project: ctx.params[0] as RepoName,
-      changeNum: (ctx.params[1] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[1]) as NumericChangeId,
       commentId: ctx.params[2] as UrlEncodedCommentId,
       view: GerritView.DIFF,
       commentLink: true,
@@ -1562,7 +1572,7 @@
     // Parameter order is based on the regex group number matched.
     const params: GenerateUrlDiffViewParameters = {
       project: ctx.params[0] as RepoName,
-      changeNum: (ctx.params[1] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[1]) as NumericChangeId,
       basePatchNum: convertToPatchSetNum(ctx.params[4]),
       patchNum: convertToPatchSetNum(ctx.params[6]),
       path: ctx.params[8],
@@ -1580,7 +1590,7 @@
   _handleChangeLegacyRoute(ctx: PageContextWithQueryMap) {
     // Parameter order is based on the regex group number matched.
     const params: GenerateUrlLegacyChangeViewParameters = {
-      changeNum: (ctx.params[0] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[0]) as NumericChangeId,
       basePatchNum: convertToPatchSetNum(ctx.params[3]),
       patchNum: convertToPatchSetNum(ctx.params[5]),
       view: GerritView.CHANGE,
@@ -1597,8 +1607,7 @@
   _handleDiffLegacyRoute(ctx: PageContextWithQueryMap) {
     // Parameter order is based on the regex group number matched.
     const params: GenerateUrlLegacyDiffViewParameters = {
-      // TODO(TS): remove "as unknown"
-      changeNum: (ctx.params[0] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[0]) as NumericChangeId,
       basePatchNum: convertToPatchSetNum(ctx.params[2]),
       patchNum: convertToPatchSetNum(ctx.params[4]),
       path: ctx.params[5],
@@ -1619,7 +1628,7 @@
     const project = ctx.params[0] as RepoName;
     this._redirectOrNavigate({
       project,
-      changeNum: (ctx.params[1] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[1]) as NumericChangeId,
       // for edit view params, patchNum cannot be undefined
       patchNum: convertToPatchSetNum(ctx.params[2])!,
       path: ctx.params[3],
@@ -1634,8 +1643,7 @@
     const project = ctx.params[0] as RepoName;
     this._redirectOrNavigate({
       project,
-      // TODO(TS): remove "as unknown"
-      changeNum: (ctx.params[1] as unknown) as NumericChangeId,
+      changeNum: Number(ctx.params[1]) as NumericChangeId,
       patchNum: convertToPatchSetNum(ctx.params[3]),
       view: GerritView.CHANGE,
       edit: true,
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
index cdec405..ff8f8df 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
@@ -1540,7 +1540,7 @@
           ]);
           assertDataToParams({params: groups.slice(1)}, '_handleCommentRoute', {
             project: 'gerrit',
-            changeNum: '264833',
+            changeNum: 264833,
             commentId: '00049681_f34fd6a9',
             commentLink: true,
             view: GerritNav.View.DIFF,
diff --git a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts
index dc9a92f..43f8a2b 100644
--- a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts
+++ b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.ts
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 import '../../shared/gr-autocomplete/gr-autocomplete';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.ts b/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.ts
index 042d4fe..b698732 100644
--- a/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.ts
+++ b/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-search-bar/gr-search-bar';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts
index 44cc258..43b0588 100644
--- a/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts
+++ b/polygerrit-ui/app/elements/diff/gr-apply-fix-dialog/gr-apply-fix-dialog.ts
@@ -18,7 +18,6 @@
 import '../../../styles/shared-styles';
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-diff/gr-diff';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
@@ -40,6 +39,7 @@
 import {isRobot} from '../../../utils/comment-util';
 import {OpenFixPreviewEvent} from '../../../types/events';
 import {appContext} from '../../../services/app-context';
+import {fireEvent} from '../../../utils/event-util';
 
 export interface GrApplyFixDialog {
   $: {
@@ -130,12 +130,7 @@
     );
     return Promise.all(promises).then(() => {
       // ensures gr-overlay repositions overlay in center
-      this.$.applyFixOverlay.dispatchEvent(
-        new CustomEvent('iron-resize', {
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireEvent(this.$.applyFixOverlay, 'iron-resize');
     });
   }
 
@@ -143,12 +138,7 @@
     super.attached();
     this.refitOverlay = () => {
       // re-center the dialog as content changed
-      this.$.applyFixOverlay.dispatchEvent(
-        new CustomEvent('iron-resize', {
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireEvent(this.$.applyFixOverlay, 'iron-resize');
     };
     this.addEventListener('diff-context-expanded', this.refitOverlay);
   }
@@ -243,12 +233,7 @@
     this._currentPreviews = [];
     this._isApplyFixLoading = false;
 
-    this.dispatchEvent(
-      new CustomEvent('close-fix-preview', {
-        bubbles: true,
-        composed: true,
-      })
-    );
+    fireEvent(this, 'close-fix-preview');
     this.$.applyFixOverlay.close();
   }
 
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 ab25c43..9988116 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
@@ -14,31 +14,24 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-comment-api_html';
-import {
-  getParentIndex,
-  isMergeParent,
-  patchNumEquals,
-  CURRENT,
-} from '../../../utils/patch-set-util';
+import {patchNumEquals, CURRENT} from '../../../utils/patch-set-util';
 import {customElement, property} from '@polymer/decorators';
 import {
   CommentBasics,
-  ParentPatchSetNum,
   PatchRange,
   PatchSetNum,
   PathToRobotCommentsInfoMap,
   RobotCommentInfo,
   UrlEncodedCommentId,
   NumericChangeId,
-  RevisionId,
+  PathToCommentsInfoMap,
+  FileInfo,
 } from '../../../types/common';
 import {hasOwnProperty} from '../../../utils/common-util';
-import {CommentSide, Side} from '../../../constants/constants';
 import {
   Comment,
   CommentMap,
@@ -50,19 +43,21 @@
   UIHuman,
   UIRobot,
   createCommentThreads,
+  isInPatchRange,
+  isDraftThread,
+  isInBaseOfPatchRange,
+  isInRevisionOfPatchRange,
 } from '../../../utils/comment-util';
 import {PatchSetFile, PatchNumOnly, isPatchSetFile} from '../../../types/types';
 import {appContext} from '../../../services/app-context';
+import {CommentSide, Side} from '../../../constants/constants';
+import {KnownExperimentId} from '../../../services/flags/flags';
+import {pluralize} from '../../../utils/string-util';
 
 export type CommentIdToCommentThreadMap = {
   [urlEncodedCommentId: string]: CommentThread;
 };
 
-export interface TwoSidesComments {
-  left: UIComment[];
-  right: UIComment[];
-}
-
 export class ChangeComments {
   private readonly _comments: {[path: string]: UIHuman[]};
 
@@ -70,6 +65,10 @@
 
   private readonly _drafts: {[path: string]: UIDraft[]};
 
+  private readonly _portedComments: PathToCommentsInfoMap;
+
+  private readonly _portedDrafts: PathToCommentsInfoMap;
+
   /**
    * Construct a change comments object, which can be data-bound to child
    * elements of that which uses the gr-comment-api.
@@ -77,11 +76,15 @@
   constructor(
     comments: {[path: string]: UIHuman[]} | undefined,
     robotComments: {[path: string]: UIRobot[]} | undefined,
-    drafts: {[path: string]: UIDraft[]} | undefined
+    drafts: {[path: string]: UIDraft[]} | undefined,
+    portedComments: PathToCommentsInfoMap | undefined,
+    portedDrafts: PathToCommentsInfoMap | undefined
   ) {
     this._comments = this._addPath(comments);
     this._robotComments = this._addPath(robotComments);
     this._drafts = this._addPath(drafts);
+    this._portedComments = portedComments || {};
+    this._portedDrafts = portedDrafts || {};
   }
 
   /**
@@ -106,18 +109,10 @@
     return updatedComments;
   }
 
-  get comments() {
-    return this._comments;
-  }
-
   get drafts() {
     return this._drafts;
   }
 
-  get robotComments() {
-    return this._robotComments;
-  }
-
   findCommentById(commentId?: UrlEncodedCommentId): UIComment | undefined {
     if (!commentId) return undefined;
     const findComment = (comments: {[path: string]: UIComment[]}) => {
@@ -147,9 +142,9 @@
    */
   getPaths(patchRange?: PatchRange): CommentMap {
     const responses: {[path: string]: UIComment[]}[] = [
-      this.comments,
+      this._comments,
       this.drafts,
-      this.robotComments,
+      this._robotComments,
     ];
     const commentMap: CommentMap = {};
     for (const response of responses) {
@@ -161,7 +156,7 @@
             if (!patchRange) {
               return true;
             }
-            return this._isInPatchRange(c, patchRange);
+            return isInPatchRange(c, patchRange);
           })
         ) {
           commentMap[path] = true;
@@ -270,6 +265,16 @@
     return allComments;
   }
 
+  cloneWithUpdatedDrafts(drafts: {[path: string]: UIDraft[]} | undefined) {
+    return new ChangeComments(
+      this._comments,
+      this._robotComments,
+      drafts,
+      this._portedComments,
+      this._portedDrafts
+    );
+  }
+
   /**
    * Get the drafts for a path and optional patch num.
    *
@@ -301,27 +306,6 @@
     return allDrafts;
   }
 
-  _addCommentSide(comments: TwoSidesComments) {
-    const allComments = [];
-    for (const side of [Side.LEFT, Side.RIGHT]) {
-      // This is needed by the threading.
-      for (const comment of comments[side]) {
-        comment.diffSide = side;
-      }
-      allComments.push(...comments[side]);
-    }
-    return allComments;
-  }
-
-  getThreadsBySideForPath(
-    path: string,
-    patchRange: PatchRange
-  ): CommentThread[] {
-    return createCommentThreads(
-      this._addCommentSide(this.getCommentsBySideForPath(path, patchRange))
-    );
-  }
-
   /**
    * Get the comments (with drafts and robot comments) for a path and
    * patch-range. Returns an object with left and right properties mapping to
@@ -332,54 +316,120 @@
    * @param projectConfig Optional project config object to
    * include in the meta sub-object.
    */
-  getCommentsBySideForPath(
-    path: string,
-    patchRange: PatchRange
-  ): TwoSidesComments {
+  getCommentsForPath(path: string, patchRange: PatchRange): Comment[] {
     let comments: Comment[] = [];
     let drafts: DraftInfo[] = [];
     let robotComments: RobotCommentInfo[] = [];
-    if (this.comments && this.comments[path]) {
-      comments = this.comments[path];
+    if (this._comments && this._comments[path]) {
+      comments = this._comments[path];
     }
     if (this.drafts && this.drafts[path]) {
       drafts = this.drafts[path];
     }
-    if (this.robotComments && this.robotComments[path]) {
-      robotComments = this.robotComments[path];
+    if (this._robotComments && this._robotComments[path]) {
+      robotComments = this._robotComments[path];
     }
 
     drafts.forEach(d => {
       d.__draft = true;
     });
 
-    const all: Comment[] = comments
+    return comments
       .concat(drafts)
       .concat(robotComments)
+      .filter(c => isInPatchRange(c, patchRange))
       .map(c => {
         return {...c};
       });
+  }
 
-    const baseComments = all.filter(c =>
-      this._isInBaseOfPatchRange(c, patchRange)
-    );
-    const revisionComments = all.filter(c =>
-      this._isInRevisionOfPatchRange(c, patchRange)
-    );
+  /**
+   * Get the ported threads for given patch range.
+   * Ported threads are comment threads that were posted on an older patchset
+   * and are displayed on a later patchset.
+   * It is simply the original thread displayed on a newer patchset.
+   *
+   * Threads are ported over to all subsequent patchsets. So, a thread created
+   * on patchset 5 say will be ported over to patchsets 6,7,8 and beyond.
+   *
+   * Ported threads add a boolean property ported true to the thread object
+   * to indicate to the user that this is a ported thread.
+   *
+   * Any interactions with ported threads are reflected on the original threads.
+   * Replying to a ported thread ported from Patchset 6 shown on Patchset 10
+   * say creates a draft reply associated with Patchset 6, since the user is
+   * interacting with the original thread.
+   *
+   * Only threads with unresolved comments or drafts are ported over.
+   * If the thread is associated with either the left patchset or the right
+   * patchset, then we filter that ported thread from the return value
+   * as it will be rendered by default.
+   *
+   * If there is no appropriate range for the ported comments, then the backend
+   * does not return the range of the ported thread and it becomes a file level
+   * thread.
+   *
+   * @return only the ported threads for the specified file and patch range
+   */
+  _getPortedCommentThreads(
+    file: PatchSetFile,
+    patchRange: PatchRange
+  ): CommentThread[] {
+    const portedComments = this._portedComments[file.path] || [];
+    portedComments.push(...(this._portedDrafts[file.path] || []));
+    if (file.basePath) {
+      portedComments.push(...(this._portedComments[file.basePath] || []));
+      portedComments.push(...(this._portedDrafts[file.basePath] || []));
+    }
+    if (!portedComments.length) return [];
 
-    return {
-      left: baseComments,
-      right: revisionComments,
-    };
+    // when forming threads in diff view, we filter for current patchrange but
+    // ported comments will involve comments that may not belong to the
+    // current patchrange, so we need to form threads for them using all
+    // comments
+    const allComments: UIComment[] = this.getAllCommentsForFile(file, true);
+
+    return createCommentThreads(allComments).filter(thread => {
+      // Robot comments and drafts are not ported over. A human reply to
+      // the robot comment will be ported over, thefore it's possible to
+      // have the root comment of the thread not be ported, hence loop over
+      // entire thread
+      const portedComment = portedComments.find(portedComment =>
+        thread.comments.some(c => portedComment.id === c.id)
+      );
+      if (!portedComment) return false;
+
+      if (
+        isInBaseOfPatchRange(thread.comments[0], patchRange) ||
+        isInRevisionOfPatchRange(thread.comments[0], patchRange)
+      ) {
+        // no need to port this thread as it will be rendered by default
+        return false;
+      }
+
+      // TODO(dhruvsri): Add handling for thread.commentSide = PARENT
+      if (thread.commentSide === CommentSide.PARENT) return false;
+
+      if (!isUnresolved(thread) && !isDraftThread(thread)) return false;
+
+      thread.range = portedComment.range;
+      thread.line = portedComment.line;
+      thread.ported = true;
+      thread.diffSide = Side.RIGHT;
+      return true;
+    });
   }
 
   getThreadsBySideForFile(
     file: PatchSetFile,
     patchRange: PatchRange
   ): CommentThread[] {
-    return createCommentThreads(
-      this._addCommentSide(this.getCommentsBySideForFile(file, patchRange))
+    const threads = createCommentThreads(
+      this.getCommentsForFile(file, patchRange),
+      patchRange
     );
+    threads.push(...this._getPortedCommentThreads(file, patchRange));
+    return threads;
   }
 
   /**
@@ -394,19 +444,10 @@
    * @param projectConfig Optional project config object to
    * include in the meta sub-object.
    */
-  getCommentsBySideForFile(
-    file: PatchSetFile,
-    patchRange: PatchRange
-  ): TwoSidesComments {
-    const comments = this.getCommentsBySideForPath(file.path, patchRange);
+  getCommentsForFile(file: PatchSetFile, patchRange: PatchRange): Comment[] {
+    const comments = this.getCommentsForPath(file.path, patchRange);
     if (file.basePath) {
-      const commentsForBasePath = this.getCommentsBySideForPath(
-        file.basePath,
-        patchRange
-      );
-      // merge in the left and right
-      comments.left = comments.left.concat(commentsForBasePath.left);
-      comments.right = comments.right.concat(commentsForBasePath.right);
+      comments.push(...this.getCommentsForPath(file.basePath, patchRange));
     }
     return comments;
   }
@@ -447,6 +488,45 @@
   }
 
   /**
+   * @param includeUnmodified Included unmodified status of the file in the
+   * comment string or not. For files we opt of chip instead of a string.
+   * @param filterPatchset Only count threads which belong to this patchset
+   */
+  computeCommentsString(
+    patchRange?: PatchRange,
+    path?: string,
+    changeFileInfo?: FileInfo,
+    includeUnmodified?: boolean
+  ) {
+    if (!path) return '';
+    if (!patchRange) return '';
+
+    const threads = this.getThreadsBySideForFile({path}, patchRange);
+    const commentThreadCount = threads.filter(thread => !isDraftThread(thread))
+      .length;
+    const unresolvedCount = threads.reduce((cnt, thread) => {
+      if (isUnresolved(thread)) cnt += 1;
+      return cnt;
+    }, 0);
+
+    const commentThreadString = pluralize(commentThreadCount, 'comment');
+    const unresolvedString =
+      unresolvedCount === 0 ? '' : `${unresolvedCount} unresolved`;
+
+    const unmodifiedString =
+      includeUnmodified && changeFileInfo?.status === 'U' ? 'no changes' : '';
+
+    return (
+      commentThreadString +
+      // Add a space if both comments and unresolved
+      (commentThreadString && unresolvedString ? ' ' : '') +
+      // Add parentheses around unresolved if it exists.
+      (unresolvedString ? `(${unresolvedString})` : '') +
+      (unmodifiedString ? `(${unmodifiedString})` : '')
+    );
+  }
+
+  /**
    * Computes a number of unresolved comment threads in a given file and path.
    */
   computeUnresolvedNum(file: PatchSetFile | PatchNumOnly) {
@@ -472,58 +552,6 @@
     const comments = this._commentObjToArray(this.getAllComments(true));
     return createCommentThreads(comments);
   }
-
-  /**
-   * Whether the given comment should be included in the base side of the
-   * given patch range.
-   */
-  _isInBaseOfPatchRange(comment: CommentBasics, range: PatchRange) {
-    // If the base of the patch range is a parent of a merge, and the comment
-    // appears on a specific parent then only show the comment if the parent
-    // index of the comment matches that of the range.
-    if (comment.parent && comment.side === CommentSide.PARENT) {
-      return (
-        isMergeParent(range.basePatchNum) &&
-        comment.parent === getParentIndex(range.basePatchNum)
-      );
-    }
-
-    // If the base of the range is the parent of the patch:
-    if (
-      range.basePatchNum === ParentPatchSetNum &&
-      comment.side === CommentSide.PARENT &&
-      patchNumEquals(comment.patch_set, range.patchNum)
-    ) {
-      return true;
-    }
-    // If the base of the range is not the parent of the patch:
-    return (
-      range.basePatchNum !== ParentPatchSetNum &&
-      comment.side !== CommentSide.PARENT &&
-      patchNumEquals(comment.patch_set, range.basePatchNum)
-    );
-  }
-
-  /**
-   * Whether the given comment should be included in the revision side of the
-   * given patch range.
-   */
-  _isInRevisionOfPatchRange(comment: CommentBasics, range: PatchRange) {
-    return (
-      comment.side !== CommentSide.PARENT &&
-      patchNumEquals(comment.patch_set, range.patchNum)
-    );
-  }
-
-  /**
-   * Whether the given comment should be included in the given patch range.
-   */
-  _isInPatchRange(comment: CommentBasics, range: PatchRange): boolean {
-    return (
-      this._isInBaseOfPatchRange(comment, range) ||
-      this._isInRevisionOfPatchRange(comment, range)
-    );
-  }
 }
 
 // TODO(TS): move findCommentById out of class
@@ -543,28 +571,20 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly flagsService = appContext.flagsService;
+
+  private _isPortingCommentsExperimentEnabled = false;
+
   /** @override */
   created() {
     super.created();
-    this.addEventListener('reload-drafts', changeNum =>
-      // TODO(TS): This is a wrong code, however keep it as is for now
-      // If changeNum param in ChangeComments is removed, this also must be
-      // removed
-      this.reloadDrafts((changeNum as unknown) as NumericChangeId)
-    );
   }
 
-  getPortedComments(changeNum: NumericChangeId, revision?: RevisionId) {
-    if (!revision) revision = CURRENT;
-    return Promise.all([
-      this.restApiService.getPortedComments(changeNum, revision),
-      this.restApiService.getPortedDrafts(changeNum, revision),
-    ]).then(result => {
-      return {
-        portedComments: result[0],
-        portedDrafts: result[1],
-      };
-    });
+  constructor() {
+    super();
+    this._isPortingCommentsExperimentEnabled = this.flagsService.isEnabled(
+      KnownExperimentId.PORTING_COMMENTS
+    );
   }
 
   /**
@@ -572,23 +592,33 @@
    * number. The returned promise resolves when the comments have loaded, but
    * does not yield the comment data.
    */
-  loadAll(changeNum: NumericChangeId) {
-    const promises = [];
-    promises.push(this.restApiService.getDiffComments(changeNum));
-    promises.push(this.restApiService.getDiffRobotComments(changeNum));
-    promises.push(this.restApiService.getDiffDrafts(changeNum));
+  loadAll(changeNum: NumericChangeId, patchNum?: PatchSetNum) {
+    const revision = patchNum || CURRENT;
+    const commentsPromise = [
+      this.restApiService.getDiffComments(changeNum),
+      this.restApiService.getDiffRobotComments(changeNum),
+      this.restApiService.getDiffDrafts(changeNum),
+      this._isPortingCommentsExperimentEnabled
+        ? this.restApiService.getPortedComments(changeNum, revision)
+        : Promise.resolve({}),
+      this._isPortingCommentsExperimentEnabled
+        ? this.restApiService.getPortedDrafts(changeNum, revision)
+        : Promise.resolve({}),
+    ];
 
-    return Promise.all(promises).then(([comments, robotComments, drafts]) => {
-      this._changeComments = new ChangeComments(
-        comments,
-        // TODO(TS): Promise.all somehow resolve all types to
-        // PathToCommentsInfoMap given its PathToRobotCommentsInfoMap
-        // returned from the second promise
-        robotComments as PathToRobotCommentsInfoMap,
-        drafts
-      );
-      return this._changeComments;
-    });
+    return Promise.all(commentsPromise).then(
+      ([comments, robotComments, drafts, portedComments, portedDrafts]) => {
+        this._changeComments = new ChangeComments(
+          comments,
+          // TS 4.0.5 fails without 'as'
+          robotComments as PathToRobotCommentsInfoMap | undefined,
+          drafts,
+          portedComments,
+          portedDrafts
+        );
+        return this._changeComments;
+      }
+    );
   }
 
   /**
@@ -600,11 +630,8 @@
     if (!this._changeComments) {
       return this.loadAll(changeNum);
     }
-    const oldChangeComments = this._changeComments;
     return this.restApiService.getDiffDrafts(changeNum).then(drafts => {
-      this._changeComments = new ChangeComments(
-        oldChangeComments.comments,
-        (oldChangeComments.robotComments as unknown) as PathToRobotCommentsInfoMap,
+      this._changeComments = this._changeComments!.cloneWithUpdatedDrafts(
         drafts
       );
       return this._changeComments;
diff --git a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_test.js b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_test.js
index 4bea2f1d..dd36613 100644
--- a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api_test.js
@@ -18,7 +18,8 @@
 import '../../../test/common-test-setup-karma.js';
 import './gr-comment-api.js';
 import {ChangeComments} from './gr-comment-api.js';
-import {CommentSide} from '../../../constants/constants.js';
+import {isInRevisionOfPatchRange, isInBaseOfPatchRange, isDraftThread, isUnresolved, createCommentThreads} from '../../../utils/comment-util.js';
+import {createDraft, createComment, createChangeComments, createCommentThread} from '../../../test/test-data-generators.js';
 
 const basicFixture = fixtureFromElement('gr-comment-api');
 
@@ -146,180 +147,400 @@
       });
     });
 
+    suite('ported comments', () => {
+      let portedComments;
+      let changeComments;
+      const comment1 = {
+        ...createComment(),
+        unresolved: true,
+        id: 'db977012_e1f13818',
+        line: 136,
+        patch_set: 2,
+        range: {
+          start_line: 1,
+          start_character: 1,
+          end_line: 1,
+          end_character: 1,
+        },
+      };
+
+      const comment2 = {
+        ...createComment(),
+        patch_set: 2,
+        id: 'ecf0b9fa_fe1a5f62',
+        line: 5,
+      };
+
+      const draft1 = {
+        ...createDraft(),
+        id: 'db977012_e1f13828',
+        line: 4,
+        patch_set: 2,
+      };
+      const draft2 = {
+        ...createDraft(),
+        id: '503008e2_0ab203ee',
+        line: 11,
+        unresolved: true,
+        // slightly larger timestamp so it's sorted higher
+        updated: '2018-02-13 22:49:48.018000001',
+        patch_set: 2,
+      };
+
+      setup(() => {
+        portedComments = {
+          'karma.conf.js': [{
+            ...comment1,
+            patch_set: 4,
+            range: {
+              start_line: 136,
+              start_character: 16,
+              end_line: 136,
+              end_character: 29,
+            },
+          }],
+        };
+
+        changeComments = new ChangeComments(
+            {/* comments */
+              'karma.conf.js': [
+                // resolved comment that will not be ported over
+                comment2,
+                // original comment that will be ported over to patchset 4
+                comment1,
+              ],
+            },
+            {}/* robot comments */,
+            {}/* drafts */,
+            portedComments,
+            {}/* ported drafts */
+        );
+      });
+
+      test('threads containing ported comment are returned', () => {
+        assert.equal(changeComments.getAllThreadsForChange().length,
+            2);
+
+        const portedThreads = changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 4, basePatchNum: 'PARENT'});
+
+        assert.equal(portedThreads.length, 1);
+        // check range of thread is from the ported comment and not the original
+        assert.deepEqual(portedThreads[0].range, {
+          start_line: 136,
+          start_character: 16,
+          end_line: 136,
+          end_character: 29,
+        });
+
+        // thread ported over if comparing patchset 1 vs patchset 4
+        assert.equal(changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 4, basePatchNum: 1}
+        ).length, 1);
+
+        // verify ported thread is not returned if original thread will be
+        // shown
+        // original thread attached to right side
+        assert.equal(changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 2, basePatchNum: 'PARENT'}
+        ).length, 0);
+        assert.equal(changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 2, basePatchNum: 1}
+        ).length, 0);
+
+        // original thread attached to left side
+        assert.equal(changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 3, basePatchNum: 2}
+        ).length, 0);
+      });
+
+      test('threads without any ported comment are filtered out', () => {
+        changeComments = new ChangeComments(
+            {/* comments */
+              // comment that is not ported over
+              'karma.conf.js': [comment2],
+            },
+            {}/* robot comments */,
+            {/* drafts */
+              'karma.conf.js': [draft2],
+            },
+            // comment1 that is ported over but does not have any thread
+            // that has a comment that matches it
+            portedComments,
+            {}/* ported drafts */
+        );
+
+        assert.equal(createCommentThreads(changeComments
+            .getAllCommentsForPath('karma.conf.js')).length, 1);
+        assert.equal(changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 4, basePatchNum: 'PARENT'}
+        ).length, 0);
+      });
+
+      test('ported comments contribute to comment count', () => {
+        assert.equal(changeComments.computeCommentsString(
+            {basePatchNum: 'PARENT', patchNum: 2}, 'karma.conf.js',
+            {__path: 'karma.conf.js'}), '2 comments (1 unresolved)');
+
+        // comment1 is ported over to patchset 4
+        assert.equal(changeComments.computeCommentsString(
+            {basePatchNum: 'PARENT', patchNum: 4}, 'karma.conf.js',
+            {__path: 'karma.conf.js'}), '1 comment (1 unresolved)');
+      });
+
+      test('drafts are ported over', () => {
+        changeComments = new ChangeComments(
+            {}/* comments */,
+            {}/* robotComments */,
+            {/* drafts */
+              // draft1: resolved draft that will be ported over to ps 4
+              // draft2: unresolved draft that will be ported over to ps 4
+              'karma.conf.js': [draft1, draft2],
+            },
+            {}/* ported comments */,
+            {/* ported drafts */
+              'karma.conf.js': [
+                {
+                  ...draft1,
+                  line: 5,
+                  patch_set: 4,
+                },
+                {
+                  ...draft2,
+                  line: 31,
+                  patch_set: 4,
+                },
+              ],
+            }
+        );
+
+        const portedThreads = changeComments._getPortedCommentThreads(
+            {path: 'karma.conf.js'}, {patchNum: 4, basePatchNum: 'PARENT'});
+
+        // resolved draft is ported over
+        assert.equal(portedThreads.length, 2);
+        assert.equal(portedThreads[0].line, 5);
+        assert.isTrue(isDraftThread(portedThreads[0]));
+        assert.isFalse(isUnresolved(portedThreads[0]));
+
+        // unresolved draft is ported over
+        assert.equal(portedThreads[1].line, 31);
+        assert.isTrue(isDraftThread(portedThreads[1]));
+        assert.isTrue(isUnresolved(portedThreads[1]));
+
+        assert.equal(createCommentThreads(
+            changeComments.getAllCommentsForPath('karma.conf.js'),
+            {patchNum: 4, basePatchNum: 'PARENT'}).length, 0);
+      });
+    });
+
     test('_isInBaseOfPatchRange', () => {
       const comment = {patch_set: 1};
       const patchRange = {basePatchNum: 1, patchNum: 2};
-      assert.isTrue(element._changeComments._isInBaseOfPatchRange(comment,
+      assert.isTrue(isInBaseOfPatchRange(comment,
           patchRange));
 
       patchRange.basePatchNum = PARENT;
-      assert.isFalse(element._changeComments._isInBaseOfPatchRange(comment,
+      assert.isFalse(isInBaseOfPatchRange(comment,
           patchRange));
 
       comment.side = PARENT;
-      assert.isFalse(element._changeComments._isInBaseOfPatchRange(comment,
+      assert.isFalse(isInBaseOfPatchRange(comment,
           patchRange));
 
       comment.patch_set = 2;
-      assert.isTrue(element._changeComments._isInBaseOfPatchRange(comment,
+      assert.isTrue(isInBaseOfPatchRange(comment,
           patchRange));
 
       patchRange.basePatchNum = -2;
       comment.side = PARENT;
       comment.parent = 1;
-      assert.isFalse(element._changeComments._isInBaseOfPatchRange(comment,
+      assert.isFalse(isInBaseOfPatchRange(comment,
           patchRange));
 
       comment.parent = 2;
-      assert.isTrue(element._changeComments._isInBaseOfPatchRange(comment,
+      assert.isTrue(isInBaseOfPatchRange(comment,
           patchRange));
     });
 
-    test('_isInRevisionOfPatchRange', () => {
+    test('isInRevisionOfPatchRange', () => {
       const comment = {patch_set: 123};
       const patchRange = {basePatchNum: 122, patchNum: 124};
-      assert.isFalse(element._changeComments._isInRevisionOfPatchRange(
+      assert.isFalse(isInRevisionOfPatchRange(
           comment, patchRange));
 
       patchRange.patchNum = 123;
-      assert.isTrue(element._changeComments._isInRevisionOfPatchRange(
+      assert.isTrue(isInRevisionOfPatchRange(
           comment, patchRange));
 
       comment.side = PARENT;
-      assert.isFalse(element._changeComments._isInRevisionOfPatchRange(
+      assert.isFalse(isInRevisionOfPatchRange(
           comment, patchRange));
     });
 
-    test('_isInPatchRange', () => {
-      const patchRange1 = {basePatchNum: 122, patchNum: 124};
-      const patchRange2 = {basePatchNum: 123, patchNum: 125};
-      const patchRange3 = {basePatchNum: 124, patchNum: 125};
-
-      const isInBasePatchStub = sinon.stub(element._changeComments,
-          '_isInBaseOfPatchRange');
-      const isInRevisionPatchStub = sinon.stub(element._changeComments,
-          '_isInRevisionOfPatchRange');
-
-      isInBasePatchStub.withArgs({}, patchRange1).returns(true);
-      isInBasePatchStub.withArgs({}, patchRange2).returns(false);
-      isInBasePatchStub.withArgs({}, patchRange3).returns(false);
-
-      isInRevisionPatchStub.withArgs({}, patchRange1).returns(false);
-      isInRevisionPatchStub.withArgs({}, patchRange2).returns(true);
-      isInRevisionPatchStub.withArgs({}, patchRange3).returns(false);
-
-      assert.isTrue(element._changeComments._isInPatchRange({}, patchRange1));
-      assert.isTrue(element._changeComments._isInPatchRange({}, patchRange2));
-      assert.isFalse(element._changeComments._isInPatchRange({},
-          patchRange3));
-    });
-
     suite('comment ranges and paths', () => {
+      const commentObjs = {};
       function makeTime(mins) {
         return `2013-02-26 15:0${mins}:43.986000000`;
       }
 
       setup(() => {
+        commentObjs['01'] = {
+          ...createComment(),
+          id: '01',
+          patch_set: 2,
+          side: PARENT,
+          line: 1,
+          updated: makeTime(1),
+          range: {
+            start_line: 1,
+            start_character: 2,
+            end_line: 2,
+            end_character: 2,
+          },
+        };
+
+        commentObjs['02'] = {
+          ...createComment(),
+          id: '02',
+          in_reply_to: '04',
+          patch_set: 2,
+          unresolved: true,
+          line: 1,
+          updated: makeTime(3),
+        };
+
+        commentObjs['03'] = {
+          ...createComment(),
+          id: '03',
+          patch_set: 2,
+          side: PARENT,
+          line: 2,
+          updated: makeTime(1),
+        };
+
+        commentObjs['04'] = {
+          ...createComment(),
+          id: '04',
+          patch_set: 2,
+          line: 1,
+          updated: makeTime(1),
+        };
+
+        commentObjs['05'] = {
+          ...createComment(),
+          id: '05',
+          patch_set: 2,
+          line: 2,
+          updated: makeTime(1),
+        };
+
+        commentObjs['06'] = {
+          ...createComment(),
+          id: '06',
+          patch_set: 3,
+          line: 2,
+          updated: makeTime(1),
+        };
+
+        commentObjs['07'] = {
+          ...createComment(),
+          id: '07',
+          patch_set: 2,
+          side: PARENT,
+          unresolved: false,
+          line: 1,
+          updated: makeTime(1),
+        };
+
+        commentObjs['08'] = {
+          ...createComment(),
+          id: '08',
+          patch_set: 2,
+          side: PARENT,
+          unresolved: true,
+          in_reply_to: '07',
+          line: 1,
+          updated: makeTime(1),
+        };
+
+        commentObjs['09'] = {
+          ...createComment(),
+          id: '09',
+          patch_set: 3,
+          line: 1,
+          updated: makeTime(1),
+        };
+
+        commentObjs['10'] = {
+          ...createComment(),
+          id: '10',
+          patch_set: 5,
+          side: PARENT,
+          line: 1,
+          updated: makeTime(1),
+        };
+
+        commentObjs['11'] = {
+          ...createComment(),
+          id: '11',
+          patch_set: 5,
+          line: 1,
+          updated: makeTime(1),
+        };
+
+        commentObjs['12'] = {
+          ...createDraft(),
+          id: '12',
+          patch_set: 2,
+          side: PARENT,
+          line: 1,
+          updated: makeTime(3),
+        };
+
+        commentObjs['13'] = {
+          ...createDraft(),
+          id: '13',
+          in_reply_to: '04',
+          patch_set: 2,
+          line: 1,
+          // Draft gets lower timestamp than published comment, because we
+          // want to test that the draft still gets sorted to the end.
+          updated: makeTime(2),
+        };
+
+        commentObjs['14'] = {
+          ...createDraft(),
+          id: '14',
+          patch_set: 3,
+          line: 1,
+          path: 'file/two',
+          updated: makeTime(3),
+        };
+
         const drafts = {
           'file/one': [
-            {
-              id: '12',
-              patch_set: 2,
-              side: PARENT,
-              line: 1,
-              updated: makeTime(3),
-            },
-            {
-              id: '13',
-              in_reply_to: '04',
-              patch_set: 2,
-              line: 1,
-              // Draft gets lower timestamp than published comment, because we
-              // want to test that the draft still gets sorted to the end.
-              updated: makeTime(2),
-            },
+            commentObjs['12'],
+            commentObjs['13'],
           ],
           'file/two': [
-            {
-              id: '05',
-              patch_set: 3,
-              line: 1,
-              updated: makeTime(3),
-            },
+            commentObjs['14'],
           ],
         };
         const robotComments = {
           'file/one': [
-            {
-              id: '01',
-              patch_set: 2,
-              side: PARENT,
-              line: 1,
-              updated: makeTime(1),
-              range: {
-                start_line: 1,
-                start_character: 2,
-                end_line: 2,
-                end_character: 2,
-              },
-            }, {
-              id: '02',
-              in_reply_to: '04',
-              patch_set: 2,
-              unresolved: true,
-              line: 1,
-              updated: makeTime(3),
-            },
+            commentObjs['01'], commentObjs['02'],
           ],
         };
         const comments = {
-          'file/one': [
-            {
-              id: '03',
-              patch_set: 2,
-              side: PARENT,
-              line: 2,
-              updated: makeTime(1),
-            },
-            {id: '04', patch_set: 2, line: 1, updated: makeTime(1)},
-          ],
-          'file/two': [
-            {id: '05', patch_set: 2, line: 2, updated: makeTime(1)},
-            {id: '06', patch_set: 3, line: 2, updated: makeTime(1)},
-          ],
-          'file/three': [
-            {
-              id: '07',
-              patch_set: 2,
-              side: PARENT,
-              unresolved: false,
-              line: 1,
-              updated: makeTime(1),
-            },
-            {
-              id: '08',
-              patch_set: 2,
-              side: PARENT,
-              unresolved: true,
-              in_reply_to: '07',
-              line: 1,
-              updated: makeTime(1),
-            },
-            {id: '09', patch_set: 3, line: 1, updated: makeTime(1)},
-          ],
-          'file/four': [
-            {
-              id: '10',
-              patch_set: 5,
-              side: PARENT,
-              line: 1,
-              updated: makeTime(1),
-            },
-            {id: '11', patch_set: 5, line: 1, updated: makeTime(1)},
-          ],
+          'file/one': [commentObjs['03'], commentObjs['04']],
+          'file/two': [commentObjs['05'], commentObjs['06']],
+          'file/three': [commentObjs['07'], commentObjs['08'],
+            commentObjs['09']],
+          'file/four': [commentObjs['10'], commentObjs['11']],
         };
         element._changeComments =
-            new ChangeComments(comments, robotComments, drafts, 1234);
+            new ChangeComments(comments, robotComments, drafts, {}, {});
       });
 
       test('getPaths', () => {
@@ -349,32 +570,40 @@
         assert.property(paths, 'file/four');
       });
 
-      test('getCommentsBySideForPath', () => {
+      test('getCommentsForPath', () => {
         const patchRange = {basePatchNum: 1, patchNum: 3};
         let path = 'file/one';
-        let comments = element._changeComments.getCommentsBySideForPath(path,
+        let comments = element._changeComments.getCommentsForPath(path,
             patchRange);
-        assert.equal(comments.left.length, 0);
-        assert.equal(comments.right.length, 0);
+        assert.equal(comments.filter(c => isInBaseOfPatchRange(c, patchRange))
+            .length, 0);
+        assert.equal(comments.filter(c => isInRevisionOfPatchRange(c,
+            patchRange)).length, 0);
 
         path = 'file/two';
-        comments = element._changeComments.getCommentsBySideForPath(path,
+        comments = element._changeComments.getCommentsForPath(path,
             patchRange);
-        assert.equal(comments.left.length, 0);
-        assert.equal(comments.right.length, 2);
+        assert.equal(comments.filter(c => isInBaseOfPatchRange(c, patchRange))
+            .length, 0);
+        assert.equal(comments.filter(c => isInRevisionOfPatchRange(c,
+            patchRange)).length, 2);
 
         patchRange.basePatchNum = 2;
-        comments = element._changeComments.getCommentsBySideForPath(path,
+        comments = element._changeComments.getCommentsForPath(path,
             patchRange);
-        assert.equal(comments.left.length, 1);
-        assert.equal(comments.right.length, 2);
+        assert.equal(comments.filter(c => isInBaseOfPatchRange(c,
+            patchRange)).length, 1);
+        assert.equal(comments.filter(c => isInRevisionOfPatchRange(c,
+            patchRange)).length, 2);
 
         patchRange.basePatchNum = PARENT;
         path = 'file/three';
-        comments = element._changeComments.getCommentsBySideForPath(path,
+        comments = element._changeComments.getCommentsForPath(path,
             patchRange);
-        assert.equal(comments.left.length, 0);
-        assert.equal(comments.right.length, 1);
+        assert.equal(comments.filter(c => isInBaseOfPatchRange(c, patchRange))
+            .length, 0);
+        assert.equal(comments.filter(c => isInRevisionOfPatchRange(c,
+            patchRange)).length, 1);
       });
 
       test('getAllCommentsForPath', () => {
@@ -450,6 +679,78 @@
             element._changeComments.computeUnresolvedNum(1, 'path'), 0);
       });
 
+      test('computeCommentsString', () => {
+        const changeComments = createChangeComments();
+        const parentTo1 = {
+          basePatchNum: 'PARENT',
+          patchNum: 1,
+        };
+        const parentTo2 = {
+          basePatchNum: 'PARENT',
+          patchNum: 2,
+        };
+        const _1To2 = {
+          basePatchNum: 1,
+          patchNum: 2,
+        };
+
+        assert.equal(
+            changeComments.computeCommentsString(parentTo1, '/COMMIT_MSG',
+                {__path: '/COMMIT_MSG'}), '2 comments (1 unresolved)');
+        assert.equal(
+            changeComments.computeCommentsString(parentTo1, '/COMMIT_MSG',
+                {__path: '/COMMIT_MSG', status: 'U'}, true),
+            '2 comments (1 unresolved)(no changes)');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2, '/COMMIT_MSG',
+                {__path: '/COMMIT_MSG'}), '3 comments (1 unresolved)');
+
+        assert.equal(
+            changeComments.computeCommentsString(parentTo1, 'myfile.txt',
+                {__path: 'myfile.txt'}), '1 comment');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2, 'myfile.txt',
+                {__path: 'myfile.txt'}), '3 comments');
+
+        assert.equal(
+            changeComments.computeCommentsString(parentTo1,
+                'file_added_in_rev2.txt',
+                {__path: 'file_added_in_rev2.txt'}), '');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2,
+                'file_added_in_rev2.txt',
+                {__path: 'file_added_in_rev2.txt'}), '');
+
+        assert.equal(
+            changeComments.computeCommentsString(parentTo2, '/COMMIT_MSG',
+                {__path: '/COMMIT_MSG'}), '1 comment');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2, '/COMMIT_MSG',
+                {__path: '/COMMIT_MSG'}), '3 comments (1 unresolved)');
+
+        assert.equal(
+            changeComments.computeCommentsString(parentTo2, 'myfile.txt',
+                {__path: 'myfile.txt'}), '2 comments');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2, 'myfile.txt',
+                {__path: 'myfile.txt'}), '3 comments');
+
+        assert.equal(
+            changeComments.computeCommentsString(parentTo2,
+                'file_added_in_rev2.txt',
+                {__path: 'file_added_in_rev2.txt'}), '');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2,
+                'file_added_in_rev2.txt',
+                {__path: 'file_added_in_rev2.txt'}), '');
+        assert.equal(
+            changeComments.computeCommentsString(parentTo2, 'unresolved.file',
+                {__path: 'unresolved.file'}), '2 comments (1 unresolved)');
+        assert.equal(
+            changeComments.computeCommentsString(_1To2, 'unresolved.file',
+                {__path: 'unresolved.file'}), '2 comments (1 unresolved)');
+      });
+
       test('computeCommentThreadCount', () => {
         assert.equal(element._changeComments
             .computeCommentThreadCount({
@@ -523,239 +824,31 @@
       test('computeAllThreads', () => {
         const expectedThreads = [
           {
-            comments: [
-              {
-                id: '01',
-                patch_set: 2,
-                side: 'PARENT',
-                line: 1,
-                updated: '2013-02-26 15:01:43.986000000',
-                range: {
-                  start_line: 1,
-                  start_character: 2,
-                  end_line: 2,
-                  end_character: 2,
-                },
-                path: 'file/one',
-              },
-            ],
-            diffSide: undefined,
-            commentSide: 'PARENT',
-            patchNum: 2,
-            path: 'file/one',
-            line: 1,
-            rootId: '01',
-            range: {
-              start_line: 1,
-              start_character: 2,
-              end_line: 2,
-              end_character: 2,
-            },
+            ...createCommentThread([{...commentObjs['01'], path: 'file/one'}]),
           }, {
-            comments: [
-              {
-                id: '03',
-                patch_set: 2,
-                side: 'PARENT',
-                line: 2,
-                path: 'file/one',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            patchNum: 2,
-            path: 'file/one',
-            line: 2,
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.PARENT,
-            rootId: '03',
+            ...createCommentThread([{...commentObjs['03'], path: 'file/one'}]),
           }, {
-            comments: [
-              {
-                id: '04',
-                patch_set: 2,
-                line: 1,
-                path: 'file/one',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-              {
-                id: '02',
-                in_reply_to: '04',
-                patch_set: 2,
-                unresolved: true,
-                line: 1,
-                path: 'file/one',
-                updated: '2013-02-26 15:03:43.986000000',
-              },
-              {
-                id: '13',
-                in_reply_to: '04',
-                patch_set: 2,
-                line: 1,
-                path: 'file/one',
-                __draft: true,
-                updated: '2013-02-26 15:02:43.986000000',
-              },
-            ],
-            patchNum: 2,
-            path: 'file/one',
-            line: 1,
-            rootId: '04',
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.REVISION,
+            ...createCommentThread([{...commentObjs['04'], path: 'file/one'},
+              {...commentObjs['02'], path: 'file/one'},
+              {...commentObjs['13'], path: 'file/one'}]),
           }, {
-            comments: [
-              {
-                id: '05',
-                patch_set: 2,
-                line: 2,
-                path: 'file/two',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            patchNum: 2,
-            path: 'file/two',
-            line: 2,
-            rootId: '05',
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.REVISION,
+            ...createCommentThread([{...commentObjs['05'], path: 'file/two'}]),
           }, {
-            comments: [
-              {
-                id: '06',
-                patch_set: 3,
-                line: 2,
-                path: 'file/two',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            patchNum: 3,
-            path: 'file/two',
-            line: 2,
-            rootId: '06',
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.REVISION,
+            ...createCommentThread([{...commentObjs['06'], path: 'file/two'}]),
           }, {
-            comments: [
-              {
-                id: '07',
-                patch_set: 2,
-                side: 'PARENT',
-                unresolved: false,
-                line: 1,
-                path: 'file/three',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-              {
-                id: '08',
-                in_reply_to: '07',
-                patch_set: 2,
-                side: 'PARENT',
-                unresolved: true,
-                line: 1,
-                path: 'file/three',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            commentSide: 'PARENT',
-            patchNum: 2,
-            path: 'file/three',
-            line: 1,
-            rootId: '07',
-            range: undefined,
-            diffSide: undefined,
+            ...createCommentThread([{...commentObjs['07'], path: 'file/three'},
+              {...commentObjs['08'], path: 'file/three'}]),
           }, {
-            comments: [
-              {
-                id: '09',
-                patch_set: 3,
-                line: 1,
-                path: 'file/three',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            patchNum: 3,
-            path: 'file/three',
-            line: 1,
-            rootId: '09',
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.REVISION,
+            ...createCommentThread([{...commentObjs['09'], path: 'file/three'}]
+            ),
           }, {
-            comments: [
-              {
-                id: '10',
-                patch_set: 5,
-                side: 'PARENT',
-                line: 1,
-                path: 'file/four',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            commentSide: 'PARENT',
-            patchNum: 5,
-            path: 'file/four',
-            line: 1,
-            rootId: '10',
-            range: undefined,
-            diffSide: undefined,
+            ...createCommentThread([{...commentObjs['10'], path: 'file/four'}]),
           }, {
-            comments: [
-              {
-                id: '11',
-                patch_set: 5,
-                line: 1,
-                path: 'file/four',
-                updated: '2013-02-26 15:01:43.986000000',
-              },
-            ],
-            rootId: '11',
-            patchNum: 5,
-            path: 'file/four',
-            line: 1,
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.REVISION,
+            ...createCommentThread([{...commentObjs['11'], path: 'file/four'}]),
           }, {
-            comments: [
-              {
-                id: '05',
-                patch_set: 3,
-                line: 1,
-                path: 'file/two',
-                __draft: true,
-                updated: '2013-02-26 15:03:43.986000000',
-              },
-            ],
-            rootId: '05',
-            patchNum: 3,
-            path: 'file/two',
-            line: 1,
-            range: undefined,
-            diffSide: undefined,
-            commentSide: CommentSide.REVISION,
+            ...createCommentThread([{...commentObjs['12'], path: 'file/one'}]),
           }, {
-            comments: [
-              {
-                id: '12',
-                patch_set: 2,
-                side: 'PARENT',
-                line: 1,
-                path: 'file/one',
-                __draft: true,
-                updated: '2013-02-26 15:03:43.986000000',
-              },
-            ],
-            rootId: '12',
-            commentSide: 'PARENT',
-            patchNum: 2,
-            path: 'file/one',
-            line: 1,
-            range: undefined,
-            diffSide: undefined,
+            ...createCommentThread([{...commentObjs['14'], path: 'file/two'}]),
           },
         ];
         const threads = element._changeComments.getAllThreadsForChange();
@@ -764,47 +857,14 @@
 
       test('getCommentsForThreadGroup', () => {
         let expectedComments = [
-          {
-
-            path: 'file/one',
-            id: '04',
-            patch_set: 2,
-            line: 1,
-            updated: '2013-02-26 15:01:43.986000000',
-          },
-          {
-
-            path: 'file/one',
-            id: '02',
-            in_reply_to: '04',
-            patch_set: 2,
-            unresolved: true,
-            line: 1,
-            updated: '2013-02-26 15:03:43.986000000',
-          },
-          {
-
-            path: 'file/one',
-            __draft: true,
-            id: '13',
-            in_reply_to: '04',
-            patch_set: 2,
-            line: 1,
-            updated: '2013-02-26 15:02:43.986000000',
-          },
+          {...commentObjs['04'], path: 'file/one'},
+          {...commentObjs['02'], path: 'file/one'},
+          {...commentObjs['13'], path: 'file/one'},
         ];
         assert.deepEqual(element._changeComments.getCommentsForThread('04'),
             expectedComments);
 
-        expectedComments = [{
-          id: '12',
-          patch_set: 2,
-          side: 'PARENT',
-          line: 1,
-          path: 'file/one',
-          __draft: true,
-          updated: '2013-02-26 15:03:43.986000000',
-        }];
+        expectedComments = [{...commentObjs['12'], path: 'file/one'}];
 
         assert.deepEqual(element._changeComments.getCommentsForThread('12'),
             expectedComments);
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element.ts
index 912d59e..6e613d3 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder-element.ts
@@ -48,7 +48,7 @@
 import {GrDiffGroup} from '../gr-diff/gr-diff-group';
 import {PolymerSpliceChange} from '@polymer/polymer/interfaces';
 import {getLineNumber} from '../gr-diff/gr-diff-utils';
-import {fireAlert} from '../../../utils/event-util';
+import {fireAlert, fireEvent} from '../../../utils/event-util';
 
 const DiffViewMode = {
   SIDE_BY_SIDE: 'SIDE_BY_SIDE',
@@ -219,17 +219,13 @@
 
     const isBinary = !!(this.isImageDiff || this.diff.binary);
 
-    this.dispatchEvent(
-      new CustomEvent('render-start', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'render-start');
     this._cancelableRenderPromise = util.makeCancelable(
       this.$.processor.process(this.diff.content, isBinary).then(() => {
         if (this.isImageDiff) {
           (this._builder as GrDiffBuilderImage).renderDiff();
         }
-        this.dispatchEvent(
-          new CustomEvent('render-content', {bubbles: true, composed: true})
-        );
+        fireEvent(this, 'render-content');
       })
     );
     return (
@@ -336,16 +332,7 @@
       sectionEl.parentNode.removeChild(sectionEl);
     }
 
-    this.async(
-      () =>
-        this.dispatchEvent(
-          new CustomEvent('render-content', {
-            composed: true,
-            bubbles: true,
-          })
-        ),
-      1
-    );
+    this.async(() => fireEvent(this, 'render-content'), 1);
   }
 
   cancel() {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
index 31bd6d6..601ea80 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.ts
@@ -28,6 +28,7 @@
 import {DiffViewMode, Side} from '../../../constants/constants';
 import {DiffLayer} from '../../../types/types';
 import {MovedChunkGoToLineDetail} from '../../../types/events';
+import {pluralize} from '../../../utils/string-util';
 
 /**
  * In JS, unicode code points above 0xFFFF occupy two elements of a string.
@@ -563,17 +564,17 @@
     let requiresLoad = false;
     if (type === GrDiffBuilder.ContextButtonType.ALL) {
       if (this.useNewContextControls) {
-        text = `+${numLines} common line`;
-        button.setAttribute('aria-label', `Show ${numLines} common lines`);
+        text = `+${pluralize(numLines, 'common line')}`;
+        button.setAttribute(
+          'aria-label',
+          `Show ${pluralize(numLines, 'common line')}`
+        );
       } else {
-        text = `Show ${numLines} common line`;
+        text = `Show ${pluralize(numLines, 'common line')}`;
         const icon = this._createElement('iron-icon', 'showContext');
         icon.setAttribute('icon', 'gr-icons:unfold-more');
         button.appendChild(icon);
       }
-      if (numLines > 1) {
-        text += 's';
-      }
       requiresLoad = contextGroups.find(c => !!c.skip) !== undefined;
       if (requiresLoad) {
         // Expanding content would require load of more data
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 43ed77f..52ac7cc 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
@@ -36,7 +36,7 @@
 import {PolymerDomWrapper} from '../../../types/types';
 import {GrDiffGroupType} from '../gr-diff/gr-diff-group';
 import {GrDiff} from '../gr-diff/gr-diff';
-import {fireAlert} from '../../../utils/event-util';
+import {fireAlert, fireEvent} from '../../../utils/event-util';
 
 const DiffViewMode = {
   SIDE_BY_SIDE: 'SIDE_BY_SIDE',
@@ -220,12 +220,7 @@
       ) {
         // reset for next file
         this.lastDisplayedNavigateToNextFileToast = null;
-        this.dispatchEvent(
-          new CustomEvent('navigate-to-next-unreviewed-file', {
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireEvent(this, 'navigate-to-next-unreviewed-file');
       } else {
         this.lastDisplayedNavigateToNextFileToast = Date.now();
         fireAlert(this, 'Press n again to navigate to next unreviewed file');
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 e37a372..da50135 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
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-comment-thread/gr-comment-thread';
 import '../../shared/gr-js-api-interface/gr-js-api-interface';
 import '../gr-diff/gr-diff';
@@ -69,7 +68,12 @@
 import {LineNumber, FILE} from '../gr-diff/gr-diff-line';
 import {GrCommentThread} from '../../shared/gr-comment-thread/gr-comment-thread';
 import {KnownExperimentId} from '../../../services/flags/flags';
-import {firePageError, fireAlert} from '../../../utils/event-util';
+import {
+  firePageError,
+  fireAlert,
+  fireServerError,
+  fireEvent,
+} from '../../../utils/event-util';
 
 const MSG_EMPTY_BLAME = 'No blame information for this diff.';
 
@@ -584,7 +588,7 @@
           this._getIgnoreWhitespace(),
           reject
         )
-        .then(resolve);
+        .then(diff => resolve(diff!)); // reject is called in case of error, so we can't get undefined here
     });
   }
 
@@ -592,13 +596,7 @@
     // Loading the diff may respond with 409 if the file is too large. In this
     // case, use a toast error..
     if (response.status === 409) {
-      this.dispatchEvent(
-        new CustomEvent('server-error', {
-          detail: {response},
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireServerError(response);
       return;
     }
 
@@ -781,6 +779,7 @@
     threadEl.changeNum = this.changeNum;
     threadEl.patchNum = thread.patchNum;
     threadEl.showPatchset = false;
+    threadEl.showPortedComment = !!thread.ported;
     // GrCommentThread does not understand 'FILE', but requires undefined.
     threadEl.lineNum = thread.line !== 'FILE' ? thread.line : undefined;
     threadEl.projectName = this.projectName;
@@ -916,9 +915,7 @@
   }
 
   _handleCommentSaveOrDiscard() {
-    this.dispatchEvent(
-      new CustomEvent('diff-comments-modified', {bubbles: true, composed: true})
-    );
+    fireEvent(this, 'diff-comments-modified');
   }
 
   _isSyntaxHighlightingEnabled(
@@ -1080,7 +1077,8 @@
 // TODO(TS): Be more specific than CustomEvent, which has detail:any.
 declare global {
   interface HTMLElementEventMap {
-    render: CustomEvent;
+    /* prettier-ignore */
+    'render': CustomEvent;
     'normalize-range': CustomEvent;
     'diff-context-expanded': CustomEvent;
     'create-comment': CustomEvent;
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 4c5bcb4..2c050f9 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
@@ -24,6 +24,7 @@
 import {Side, CommentSide} from '../../../constants/constants.js';
 import {createChange} from '../../../test/test-data-generators.js';
 import {FILE} from '../gr-diff/gr-diff-line.js';
+import {CoverageType} from '../../../types/types.js';
 
 const basicFixture = fixtureFromElement('gr-diff-host');
 
@@ -304,11 +305,15 @@
 
       setup(() => {
         serverErrorStub = sinon.stub();
-        element.addEventListener('server-error', serverErrorStub);
+        document.addEventListener('server-error', serverErrorStub);
         pageErrorStub = sinon.stub();
         element.addEventListener('page-error', pageErrorStub);
       });
 
+      teardown(() => {
+        document.removeEventListener('server-error', serverErrorStub);
+      });
+
       test('page error on HTTP-409', () => {
         element._handleGetDiffError({status: 409});
         assert.isTrue(serverErrorStub.calledOnce);
@@ -973,14 +978,12 @@
         message: 'i like you, jack',
         updated: '2015-12-23 15:00:20.396000000',
         line: 1,
-        diffSide: Side.LEFT,
         patch_set: 1,
         path: 'some/path',
       }, {
         id: 'jacks_reply',
         message: 'i like you, too',
         updated: '2015-12-24 15:01:20.396000000',
-        diffSide: Side.LEFT,
         line: 1,
         in_reply_to: 'sallys_confession',
         patch_set: 1,
@@ -989,7 +992,6 @@
       {
         id: 'new_draft',
         message: 'i do not like either of you',
-        diffSide: Side.LEFT,
         __draft: true,
         updated: '2015-12-20 15:01:20.396000000',
         patch_set: 1,
@@ -997,25 +999,26 @@
       },
     ];
 
-    const actualThreads = createCommentThreads(comments);
+    const actualThreads = createCommentThreads(comments,
+        {basePatchNum: 1, patchNum: 4});
 
     assert.equal(actualThreads.length, 2);
 
-    assert.equal(actualThreads[0].diffSide, 'left');
+    assert.equal(actualThreads[0].diffSide, Side.LEFT);
     assert.equal(actualThreads[0].comments.length, 2);
     assert.deepEqual(actualThreads[0].comments[0], comments[0]);
     assert.deepEqual(actualThreads[0].comments[1], comments[1]);
     assert.equal(actualThreads[0].patchNum, 1);
     assert.equal(actualThreads[0].line, 1);
 
-    assert.equal(actualThreads[1].diffSide, 'left');
+    assert.equal(actualThreads[1].diffSide, Side.LEFT);
     assert.equal(actualThreads[1].comments.length, 1);
     assert.deepEqual(actualThreads[1].comments[0], comments[2]);
     assert.equal(actualThreads[1].patchNum, 1);
     assert.equal(actualThreads[1].line, FILE);
   });
 
-  test('_createThreads inherits patchNum and range', () => {
+  test('_createThreads derives patchNum and range', () => {
     const comments = [{
       id: 'betsys_confession',
       message: 'i like you, jack',
@@ -1028,13 +1031,12 @@
       },
       patch_set: 5,
       path: '/p',
-      diffSide: Side.LEFT,
       line: 1,
     }];
 
     const expectedThreads = [
       {
-        diffSide: 'left',
+        diffSide: Side.LEFT,
         commentSide: CommentSide.REVISION,
         path: '/p',
         rootId: 'betsys_confession',
@@ -1050,7 +1052,6 @@
             end_character: 2,
           },
           patch_set: 5,
-          diffSide: Side.LEFT,
           line: 1,
         }],
         patchNum: 5,
@@ -1065,7 +1066,7 @@
     ];
 
     assert.deepEqual(
-        createCommentThreads(comments),
+        createCommentThreads(comments, {basePatchNum: 5, patchNum: 10}),
         expectedThreads);
   });
 
@@ -1090,7 +1091,7 @@
       });
 
   test('_getOrCreateThread', () => {
-    const diffSide = 'left';
+    const diffSide = Side.LEFT;
     const commentSide = CommentSide.PARENT;
 
     assert.isOk(element._getOrCreateThread('2', 3,
@@ -1126,7 +1127,7 @@
 
   test('thread should use old file path if first created ' +
    'on patch set (left) before renaming', () => {
-    const diffSide = 'left';
+    const diffSide = Side.LEFT;
     element.file = {basePath: 'file_renamed.txt', path: element.path};
 
     assert.isOk(element._getOrCreateThread('2', 3,
@@ -1142,7 +1143,7 @@
 
   test('thread should use new file path if first created' +
    'on patch set (right) after renaming', () => {
-    const diffSide = 'right';
+    const diffSide = Side.RIGHT;
     element.file = {basePath: 'file_renamed.txt', path: element.path};
 
     assert.isOk(element._getOrCreateThread('2', 3,
@@ -1158,7 +1159,7 @@
 
   test('thread should use new file path if first created' +
    'on patch set (left) but is base', () => {
-    const diffSide = 'left';
+    const diffSide = Side.LEFT;
     element.file = {basePath: 'file_renamed.txt', path: element.path};
 
     assert.isOk(element._getOrCreateThread('2', 3,
@@ -1188,19 +1189,19 @@
 
     const l3 = document.createElement('div');
     l3.setAttribute('line-num', 3);
-    l3.setAttribute('diff-side', 'left');
+    l3.setAttribute('diff-side', Side.LEFT);
 
     const l5 = document.createElement('div');
     l5.setAttribute('line-num', 5);
-    l5.setAttribute('diff-side', 'left');
+    l5.setAttribute('diff-side', Side.LEFT);
 
     const r3 = document.createElement('div');
     r3.setAttribute('line-num', 3);
-    r3.setAttribute('diff-side', 'right');
+    r3.setAttribute('diff-side', Side.RIGHT);
 
     const r5 = document.createElement('div');
     r5.setAttribute('line-num', 5);
-    r5.setAttribute('diff-side', 'right');
+    r5.setAttribute('diff-side', Side.RIGHT);
 
     const threadEls = [l3, l5, r3, r5];
     assert.deepEqual(element._filterThreadElsForLocation(threadEls, line,
@@ -1213,11 +1214,11 @@
     const line = {beforeNumber: 'FILE', afterNumber: 'FILE'};
 
     const l = document.createElement('div');
-    l.setAttribute('diff-side', 'left');
+    l.setAttribute('diff-side', Side.LEFT);
     l.setAttribute('line-num', 'FILE');
 
     const r = document.createElement('div');
-    r.setAttribute('diff-side', 'right');
+    r.setAttribute('diff-side', Side.RIGHT);
     r.setAttribute('line-num', 'FILE');
 
     const threadEls = [l, r];
@@ -1320,31 +1321,37 @@
 
   suite('coverage layer', () => {
     let notifyStub;
+    let coverageProviderStub;
+    const exampleRanges = [
+      {
+        type: CoverageType.COVERED,
+        side: Side.RIGHT,
+        code_range: {
+          start_line: 1,
+          end_line: 2,
+        },
+      },
+      {
+        type: CoverageType.NOT_COVERED,
+        side: Side.RIGHT,
+        code_range: {
+          start_line: 3,
+          end_line: 4,
+        },
+      },
+    ];
+
     setup(() => {
       notifyStub = sinon.stub();
+      coverageProviderStub = sinon.stub().returns(
+          Promise.resolve(exampleRanges));
+
       stub('gr-js-api-interface', {
         getCoverageAnnotationApis() {
           return Promise.resolve([{
             notify: notifyStub,
             getCoverageProvider() {
-              return () => Promise.resolve([
-                {
-                  type: 'COVERED',
-                  side: 'right',
-                  code_range: {
-                    start_line: 1,
-                    end_line: 2,
-                  },
-                },
-                {
-                  type: 'NOT_COVERED',
-                  side: 'right',
-                  code_range: {
-                    start_line: 3,
-                    end_line: 4,
-                  },
-                },
-              ]);
+              return coverageProviderStub;
             },
           }]);
         },
@@ -1380,9 +1387,38 @@
       element.reload();
       flush(() => {
         assert.equal(notifyStub.callCount, 2);
+        assert.isTrue(notifyStub.calledWithExactly(
+            'some/path', 1, 2, Side.RIGHT));
+        assert.isTrue(notifyStub.calledWithExactly(
+            'some/path', 3, 4, Side.RIGHT));
         done();
       });
     });
+
+    test('provider is called with appropriate params', done => {
+      element.patchRange.basePatchNum = 1;
+      element.patchRange.patchNum = 3;
+
+      element.reload();
+      flush(() => {
+        assert.isTrue(coverageProviderStub.calledWithExactly(
+            123, 'some/path', 1, 3, element.change));
+        done();
+      });
+    });
+
+    test('provider is called with appropriate params - special patchset values',
+        done => {
+          element.patchRange.basePatchNum = 'PARENT';
+          element.patchRange.patchNum = 'invalid';
+
+          element.reload();
+          flush(() => {
+            assert.isTrue(coverageProviderStub.calledWithExactly(
+                123, 'some/path', undefined, undefined, element.change));
+            done();
+          });
+        });
   });
 
   suite('trailing newlines', () => {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts
index c30feeb..cfe2cfe 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.ts
@@ -18,7 +18,6 @@
 import '@polymer/iron-a11y-announcer/iron-a11y-announcer';
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {DiffViewMode} from '../../../constants/constants';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.ts b/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.ts
index c3d758c..5a432dd 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.ts
@@ -679,15 +679,18 @@
    */
   _breakdownChunk(chunk: DiffContent): DiffContent[] {
     let key: 'a' | 'b' | 'ab' | null = null;
-    if (chunk.a && !chunk.b) {
+    const {a, b, ab, move_details} = chunk;
+    if (a?.length && !b?.length) {
       key = 'a';
-    } else if (chunk.b && !chunk.a) {
+    } else if (b?.length && !a?.length) {
       key = 'b';
-    } else if (chunk.ab) {
+    } else if (ab?.length) {
       key = 'ab';
     }
 
-    if (!key) {
+    // Move chunks should not be divided because of move label
+    // positioned in the top of the chunk
+    if (!key || move_details) {
       return [chunk];
     }
 
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor_test.js b/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor_test.js
index 5496b62..0c3c9bf 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor_test.js
@@ -590,6 +590,43 @@
       assert.deepEqual(result[1].ab, content[0].ab.slice(120));
     });
 
+    test('breaks down added chunks', () => {
+      const size = 120 * 2 + 5;
+      const content = _.times(size, () => `${Math.random()}`);
+      element.context = 5;
+      const splitContent = element._splitLargeChunks([{a: [], b: content}])
+          .map(r => r.b);
+      assert.equal(splitContent.length, 3);
+      assert.deepEqual(splitContent[0], content.slice(0, 5));
+      assert.deepEqual(splitContent[1], content.slice(5, 125));
+      assert.deepEqual(splitContent[2], content.slice(125));
+    });
+
+    test('breaks down removed chunks', () => {
+      const size = 120 * 2 + 5;
+      const content = _.times(size, () => `${Math.random()}`);
+      element.context = 5;
+      const splitContent = element._splitLargeChunks([{a: content, b: []}])
+          .map(r => r.a);
+      assert.equal(splitContent.length, 3);
+      assert.deepEqual(splitContent[0], content.slice(0, 5));
+      assert.deepEqual(splitContent[1], content.slice(5, 125));
+      assert.deepEqual(splitContent[2], content.slice(125));
+    });
+
+    test('does not break down moved chunks', () => {
+      const size = 120 * 2 + 5;
+      const content = _.times(size, () => `${Math.random()}`);
+      element.context = 5;
+      const splitContent = element._splitLargeChunks([{
+        a: content,
+        b: [],
+        move_details: {changed: false},
+      }]).map(r => r.a);
+      assert.equal(splitContent.length, 1);
+      assert.deepEqual(splitContent[0], content);
+    });
+
     test('does not break-down common chunks w/ context', () => {
       const content = [{
         ab: _.times(75, () => `${Math.random()}`),
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 5282fd7..828c53d 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
@@ -21,7 +21,6 @@
 import '../../shared/gr-dropdown/gr-dropdown';
 import '../../shared/gr-dropdown-list/gr-dropdown-list';
 import '../../shared/gr-icons/gr-icons';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import '../../shared/revision-info/revision-info';
 import '../gr-comment-api/gr-comment-api';
@@ -40,15 +39,13 @@
   KeyboardShortcutMixin,
   Shortcut,
 } from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
-import {GrCountStringFormatter} from '../../shared/gr-count-string-formatter/gr-count-string-formatter';
-import {GerritNav, GerritView} from '../../core/gr-navigation/gr-navigation';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {appContext} from '../../../services/app-context';
 import {
   computeAllPatchSets,
   computeLatestPatchNum,
   patchNumEquals,
   PatchSet,
-  CURRENT,
 } from '../../../utils/patch-set-util';
 import {
   addUnmodifiedFiles,
@@ -93,12 +90,15 @@
 import {GrApplyFixDialog} from '../gr-apply-fix-dialog/gr-apply-fix-dialog';
 import {LineOfInterest} from '../gr-diff/gr-diff';
 import {RevisionInfo as RevisionInfoObj} from '../../shared/revision-info/revision-info';
-import {CommentMap} from '../../../utils/comment-util';
+import {
+  CommentMap,
+  isInBaseOfPatchRange,
+  getPatchRangeForCommentUrl,
+} from '../../../utils/comment-util';
 import {AppElementParams} from '../../gr-app-types';
 import {CustomKeyboardEvent, OpenFixPreviewEvent} from '../../../types/events';
-import {PORTING_COMMENTS_DIFF_LATENCY_LABEL} from '../../../services/gr-reporting/gr-reporting';
 import {fireAlert, fireTitleChange} from '../../../utils/event-util';
-
+import {GerritView} from '../../../services/router/router-model';
 const ERR_REVIEW_STATUS = 'Couldn’t change file review status.';
 const MSG_LOADING_BLAME = 'Loading blame...';
 const MSG_LOADED_BLAME = 'Blame loaded';
@@ -184,9 +184,7 @@
 
   @property({
     type: Array,
-    computed:
-      '_formatFilesForDropdown(_files, ' +
-      '_patchRange.patchNum, _changeComments)',
+    computed: '_formatFilesForDropdown(_files, _patchRange, _changeComments)',
   })
   _formattedFiles?: DropdownItem[];
 
@@ -966,24 +964,12 @@
         return;
       }
       this._path = comment.path;
+
       const latestPatchNum = computeLatestPatchNum(this._allPatchSets);
-      if (!comment.patch_set) throw new Error('Missing comment.patch_set');
       if (!latestPatchNum) throw new Error('Missing _allPatchSets');
-      if (patchNumEquals(latestPatchNum, comment.patch_set)) {
-        this._patchRange = {
-          patchNum: latestPatchNum,
-          basePatchNum: ParentPatchSetNum,
-        };
-        leftSide = comment.diffSide === Side.LEFT;
-      } else {
-        this._patchRange = {
-          patchNum: latestPatchNum,
-          basePatchNum: comment.patch_set,
-        };
-        // comment is now on the left side since we are showing
-        // comment.patch_set vs latest
-        leftSide = true;
-      }
+      this._patchRange = getPatchRangeForCommentUrl(comment, latestPatchNum);
+      leftSide = isInBaseOfPatchRange(comment, this._patchRange);
+
       this._focusLineNum = comment.line;
     } else {
       if (this.params.path) {
@@ -1048,11 +1034,6 @@
       return;
     }
 
-    const portedCommentsPromise = this.$.commentAPI.getPortedComments(
-      value.changeNum,
-      value.patchNum || CURRENT
-    );
-
     const promises: Promise<unknown>[] = [];
 
     promises.push(this._getDiffPreferences());
@@ -1064,7 +1045,7 @@
     );
 
     promises.push(this._getChangeDetail(this._changeNum));
-    promises.push(this._loadComments());
+    promises.push(this._loadComments(value.patchNum));
 
     promises.push(this._getChangeEdit());
 
@@ -1073,19 +1054,21 @@
     this._loading = true;
     return Promise.all(promises)
       .then(r => {
-        this.reporting.time(PORTING_COMMENTS_DIFF_LATENCY_LABEL);
         this._loading = false;
         this._initPatchRange();
         this._initCommitRange();
-        if (this._changeComments && this._path && this._patchRange) {
-          this.$.diffHost.threads = this._changeComments.getThreadsBySideForPath(
-            this._path,
-            this._patchRange
-          );
-        }
-        portedCommentsPromise.then(() => {
-          this.reporting.timeEnd(PORTING_COMMENTS_DIFF_LATENCY_LABEL);
-        });
+
+        if (!this._path) throw new Error('path must be defined');
+        if (!this._changeComments)
+          throw new Error('change comments must be defined');
+        if (!this._patchRange) throw new Error('patch range must be defined');
+
+        // TODO(dhruvsri): check if basePath should be set here
+        this.$.diffHost.threads = this._changeComments.getThreadsBySideForFile(
+          {path: this._path},
+          this._patchRange
+        );
+
         const edit = r[4] as EditInfo | undefined;
         if (edit) {
           this.set(`_change.revisions.${edit.commit.commit}`, {
@@ -1312,11 +1295,11 @@
 
   _formatFilesForDropdown(
     files?: Files,
-    patchNum?: PatchSetNum,
+    patchRange?: PatchRange,
     changeComments?: ChangeComments
   ): DropdownItem[] {
     if (!files) return [];
-    if (!patchNum) return [];
+    if (!patchRange) return [];
     if (!changeComments) return [];
 
     const dropdownContent: DropdownItem[] = [];
@@ -1325,51 +1308,18 @@
         text: computeDisplayPath(path),
         mobileText: computeTruncatedPath(path),
         value: path,
-        bottomText: this._computeCommentString(
-          changeComments,
-          patchNum,
+        bottomText: changeComments.computeCommentsString(
+          patchRange,
           path,
-          files.changeFilesByPath[path]
+          files.changeFilesByPath[path],
+          /* includeUnmodified= */ true
         ),
+        file: {...files.changeFilesByPath[path], __path: path},
       });
     }
     return dropdownContent;
   }
 
-  _computeCommentString(
-    changeComments?: ChangeComments,
-    patchNum?: PatchSetNum,
-    path?: string,
-    changeFileInfo?: FileInfo
-  ) {
-    if (!changeComments) return '';
-    if (!path) return '';
-    if (!changeFileInfo) return '';
-
-    const unresolvedCount = changeComments.computeUnresolvedNum({
-      patchNum,
-      path,
-    });
-    const commentThreadCount = changeComments.computeCommentThreadCount({
-      patchNum,
-      path,
-    });
-    const commentThreadString = GrCountStringFormatter.computePluralString(
-      commentThreadCount,
-      'comment'
-    );
-    const unresolvedString = GrCountStringFormatter.computeString(
-      unresolvedCount,
-      'unresolved'
-    );
-
-    const unmodifiedString = changeFileInfo.status === 'U' ? 'no changes' : '';
-
-    return [unmodifiedString, commentThreadString, unresolvedString]
-      .filter(v => v && v.length > 0)
-      .join(', ');
-  }
-
   _computePrefsButtonHidden(
     prefs?: DiffPreferencesInfo,
     prefsDisabled?: boolean
@@ -1548,11 +1498,13 @@
     return url;
   }
 
-  _loadComments() {
+  _loadComments(patchSet?: PatchSetNum) {
     if (!this._changeNum) throw new Error('Missing this._changeNum');
-    return this.$.commentAPI.loadAll(this._changeNum).then(comments => {
-      this._changeComments = comments;
-    });
+    return this.$.commentAPI
+      .loadAll(this._changeNum, patchSet)
+      .then(comments => {
+        this._changeComments = comments;
+      });
   }
 
   @observe('_files.changeFilesByPath', '_path', '_patchRange', '_projectConfig')
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 a8d3abd..72e1a8f 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
@@ -18,16 +18,16 @@
 import '../../../test/common-test-setup-karma.js';
 import './gr-diff-view.js';
 import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
-import {ChangeStatus, Side} from '../../../constants/constants.js';
+import {ChangeStatus} from '../../../constants/constants.js';
 import {TestKeyboardShortcutBinder} from '../../../test/test-utils.js';
 import {SPECIAL_PATCH_SET_NUM} from '../../../utils/patch-set-util.js';
 import {Shortcut} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
 import {_testOnly_findCommentById} from '../gr-comment-api/gr-comment-api.js';
-import {appContext} from '../../../services/app-context.js';
-import {GerritView} from '../../core/gr-navigation/gr-navigation.js';
+import {GerritView} from '../../../services/router/router-model.js';
 import {
   createChange,
   createRevisions,
+  createComment,
 } from '../../../test/test-data-generators.js';
 
 const basicFixture = fixtureFromElement('gr-diff-view');
@@ -90,7 +90,6 @@
 
     setup(async () => {
       clock = sinon.useFakeTimers();
-      sinon.stub(appContext.flagsService, 'isEnabled').returns(true);
       stub('gr-rest-api-interface', {
         getConfig() {
           return Promise.resolve({change: {}});
@@ -119,6 +118,9 @@
         getDiffDrafts() {
           return Promise.resolve({});
         },
+        getPortedComments() {
+          return Promise.resolve({});
+        },
         getReviewedFiles() {
           return Promise.resolve([]);
         },
@@ -135,24 +137,24 @@
       sinon.stub(element.$.commentAPI, 'loadAll').returns(Promise.resolve({
         _comments: {'/COMMIT_MSG': [
           {
+            ...createComment(),
             id: 'c1',
             line: 10,
             patch_set: 2,
-            diffSide: Side.LEFT,
             path: '/COMMIT_MSG',
           }, {
+            ...createComment(),
             id: 'c3',
             line: 10,
             patch_set: 'PARENT',
-            diffSide: Side.LEFT,
             path: '/COMMIT_MSG',
           },
         ]},
         computeCommentThreadCount: () => {},
+        computeCommentsString: () => '',
         computeUnresolvedNum: () => {},
         getPaths: () => {},
-        getThreadsBySideForPath: () => {},
-        getThreadsBySideForFile: () => {},
+        getThreadsBySideForFile: () => [],
         findCommentById: _testOnly_findCommentById,
 
       }));
@@ -178,44 +180,51 @@
         basePatchNum: 1,
         path: '/COMMIT_MSG',
       };
+      element._path = '/COMMIT_MSG';
+      element._patchRange = {};
       return element._paramsChanged.returnValues[0].then(() => {
         assert.isTrue(element.reporting.diffViewDisplayed.calledOnce);
       });
     });
 
-    test('comment route', () => {
-      const initLineOfInterestAndCursorStub =
+    suite('comment route', () => {
+      let initLineOfInterestAndCursorStub; let getUrlStub; let replaceStateStub;
+      setup(() => {
+        initLineOfInterestAndCursorStub =
         sinon.stub(element, '_initLineOfInterestAndCursor');
-      const getUrlStub = sinon.stub(GerritNav, 'getUrlForDiffById');
-      const replaceStateStub = sinon.stub(history, 'replaceState');
-      sinon.stub(element, '_getFiles');
-      sinon.stub(element.reporting, 'diffViewDisplayed');
-      sinon.stub(element.$.diffHost, 'reload').returns(Promise.resolve());
-      sinon.spy(element, '_paramsChanged');
-      sinon.stub(element, '_getChangeDetail').returns(Promise.resolve({
-        ...createChange(),
-        revisions: createRevisions(11),
-      }));
-      element.params = {
-        view: GerritNav.View.DIFF,
-        changeNum: '42',
-        commentLink: true,
-        commentId: 'c1',
-      };
-      element._change = {
-        ...createChange(),
-        revisions: createRevisions(11),
-      };
-      return element._paramsChanged.returnValues[0].then(() => {
-        assert.isTrue(initLineOfInterestAndCursorStub.
-            calledWithExactly(true));
-        assert.equal(element._focusLineNum, 10);
-        assert.equal(element._patchRange.patchNum, 11);
-        assert.equal(element._patchRange.basePatchNum, 2);
+        getUrlStub = sinon.stub(GerritNav, 'getUrlForDiffById');
+        replaceStateStub = sinon.stub(history, 'replaceState');
+        sinon.stub(element, '_getFiles');
+        sinon.stub(element.reporting, 'diffViewDisplayed');
+        sinon.stub(element.$.diffHost, 'reload').returns(Promise.resolve());
+        sinon.spy(element, '_paramsChanged');
+        sinon.stub(element, '_getChangeDetail').returns(Promise.resolve({
+          ...createChange(),
+          revisions: createRevisions(11),
+        }));
+      });
 
-        assert.isTrue(replaceStateStub.called);
-        assert.isTrue(getUrlStub.calledWithExactly('42', 'test-project',
-            '/COMMIT_MSG', 11, 2, 10, true));
+      test('comment url resolves to comment.patch_set vs latest', () => {
+        element.params = {
+          view: GerritNav.View.DIFF,
+          changeNum: '42',
+          commentLink: true,
+          commentId: 'c1',
+        };
+        element._change = {
+          ...createChange(),
+          revisions: createRevisions(11),
+        };
+        return element._paramsChanged.returnValues[0].then(() => {
+          assert.isTrue(initLineOfInterestAndCursorStub.
+              calledWithExactly(true));
+          assert.equal(element._focusLineNum, 10);
+          assert.equal(element._patchRange.patchNum, 11);
+          assert.equal(element._patchRange.basePatchNum, 2);
+          assert.isTrue(replaceStateStub.called);
+          assert.isTrue(getUrlStub.calledWithExactly('42', 'test-project',
+              '/COMMIT_MSG', 11, 2, 10, true));
+        });
       });
     });
 
@@ -235,6 +244,8 @@
         basePatchNum: 1,
         path: '/COMMIT_MSG',
       };
+      element._path = '/COMMIT_MSG';
+      element._patchRange = {};
       return element._paramsChanged.returnValues[0].then(() => {
         assert.isTrue(element._isBlameLoaded);
         assert.isTrue(element._loadBlame.calledOnce);
@@ -901,44 +912,6 @@
       assert.isTrue(overlayOpenStub.called);
     });
 
-    test('_computeCommentString', done => {
-      const path = '/test';
-      element.$.commentAPI.loadAll().then(comments => {
-        const commentThreadCountStub =
-            sinon.stub(comments, 'computeCommentThreadCount');
-        const unresolvedCountStub =
-            sinon.stub(comments, 'computeUnresolvedNum');
-        commentThreadCountStub.withArgs({patchNum: 1, path}).returns(0);
-        commentThreadCountStub.withArgs({patchNum: 2, path}).returns(1);
-        commentThreadCountStub.withArgs({patchNum: 3, path}).returns(2);
-        commentThreadCountStub.withArgs({patchNum: 4, path}).returns(0);
-        unresolvedCountStub.withArgs({patchNum: 1, path}).returns(1);
-        unresolvedCountStub.withArgs({patchNum: 2, path}).returns(0);
-        unresolvedCountStub.withArgs({patchNum: 3, path}).returns(2);
-        unresolvedCountStub.withArgs({patchNum: 4, path}).returns(0);
-
-        assert.equal(element._computeCommentString(comments, 1, path, {}),
-            '1 unresolved');
-        assert.equal(
-            element._computeCommentString(comments, 2, path, {status: 'M'}),
-            '1 comment');
-        assert.equal(
-            element._computeCommentString(comments, 2, path, {status: 'U'}),
-            'no changes, 1 comment');
-        assert.equal(
-            element._computeCommentString(comments, 3, path, {status: 'A'}),
-            '2 comments, 2 unresolved');
-        assert.equal(
-            element._computeCommentString(
-                comments, 4, path, {status: 'M'}
-            ), '');
-        assert.equal(
-            element._computeCommentString(comments, 4, path, {status: 'U'}),
-            'no changes');
-        done();
-      });
-    });
-
     suite('url params', () => {
       setup(() => {
         sinon.stub(element, '_getFiles');
@@ -958,9 +931,6 @@
           basePatchNum: PARENT,
           patchNum: 10,
         };
-        // computeCommentThreadCount is an empty function hence stubbing
-        // function that depends on it's return value
-        sinon.stub(element, '_computeCommentString').returns('');
         element._change = {_number: 42};
         element._files = getFilesFromFileList(
             ['chell.go', 'glados.txt', 'wheatley.md',
@@ -972,28 +942,43 @@
             mobileText: 'chell.go',
             value: 'chell.go',
             bottomText: '',
+            file: {
+              __path: 'chell.go',
+            },
           }, {
             text: 'glados.txt',
             mobileText: 'glados.txt',
             value: 'glados.txt',
             bottomText: '',
+            file: {
+              __path: 'glados.txt',
+            },
           }, {
             text: 'wheatley.md',
             mobileText: 'wheatley.md',
             value: 'wheatley.md',
             bottomText: '',
+            file: {
+              __path: 'wheatley.md',
+            },
           },
           {
             text: 'Commit message',
             mobileText: 'Commit message',
             value: '/COMMIT_MSG',
             bottomText: '',
+            file: {
+              __path: '/COMMIT_MSG',
+            },
           },
           {
             text: 'Merge list',
             mobileText: 'Merge list',
             value: '/MERGE_LIST',
             bottomText: '',
+            file: {
+              __path: '/MERGE_LIST',
+            },
           },
         ];
 
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts
index eebcb15..038153a 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff-utils.ts
@@ -83,7 +83,7 @@
 // For Gerrit these are instances of GrCommentThread, but other gr-diff users
 // have different HTML elements in use for comment threads.
 // TODO: Also document the required HTML attritbutes that thread elements must
-// have, e.g. 'comment-side', 'range', 'line-num', 'data-value'.
+// have, e.g. 'diff-side', 'range', 'line-num', 'data-value'.
 export interface GrDiffThreadElement extends HTMLElement {
   rootId: string;
 }
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts
index 7092361..04714bb 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.ts
@@ -66,7 +66,7 @@
 import {FlattenedNodesObserver} from '@polymer/polymer/lib/utils/flattened-nodes-observer';
 import {PolymerDeepPropertyChange} from '@polymer/polymer/interfaces';
 import {AbortStop} from '../../shared/gr-cursor-manager/gr-cursor-manager';
-import {fireAlert} from '../../../utils/event-util';
+import {fireAlert, fireEvent} from '../../../utils/event-util';
 import {MovedChunkGoToLineEvent} from '../../../types/events';
 
 const NO_NEWLINE_BASE = 'No newline at end of base file.';
@@ -438,20 +438,10 @@
   _redispatchHoverEvents(addedThreadEls: HTMLElement[]) {
     for (const threadEl of addedThreadEls) {
       threadEl.addEventListener('mouseenter', () => {
-        threadEl.dispatchEvent(
-          new CustomEvent('comment-thread-mouseenter', {
-            bubbles: true,
-            composed: true,
-          })
-        );
+        fireEvent(threadEl, 'comment-thread-mouseenter');
       });
       threadEl.addEventListener('mouseleave', () => {
-        threadEl.dispatchEvent(
-          new CustomEvent('comment-thread-mouseleave', {
-            bubbles: true,
-            composed: true,
-          })
-        );
+        fireEvent(threadEl, 'comment-thread-mouseleave');
       });
     }
   }
@@ -604,12 +594,7 @@
 
   _isValidElForComment(el: Element) {
     if (!this.loggedIn) {
-      this.dispatchEvent(
-        new CustomEvent('show-auth-required', {
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireEvent(this, 'show-auth-required');
       return false;
     }
     if (!this.patchRange) {
@@ -843,9 +828,7 @@
 
   _renderDiffTable() {
     if (!this.prefs) {
-      this.dispatchEvent(
-        new CustomEvent('render', {bubbles: true, composed: true})
-      );
+      fireEvent(this, 'render');
       return;
     }
     if (
@@ -855,9 +838,7 @@
       this._safetyBypass === null
     ) {
       this._showWarning = true;
-      this.dispatchEvent(
-        new CustomEvent('render', {bubbles: true, composed: true})
-      );
+      fireEvent(this, 'render');
       return;
     }
 
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 2c8b704..557d1eb 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
@@ -552,9 +552,9 @@
 
     /** Make comments selectable when selected */
     .selected-left.selected-comment
-      ::slotted(gr-comment-thread[comment-side='left']),
+      ::slotted(gr-comment-thread[diff-side='left']),
     .selected-right.selected-comment
-      ::slotted(gr-comment-thread[comment-side='right']) {
+      ::slotted(gr-comment-thread[diff-side='right']) {
       -webkit-user-select: text;
       -moz-user-select: text;
       -ms-user-select: text;
diff --git a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts
index 2a9fe54..ec39da2 100644
--- a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts
+++ b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.ts
@@ -22,7 +22,7 @@
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-patch-range-select_html';
-import {GrCountStringFormatter} from '../../shared/gr-count-string-formatter/gr-count-string-formatter';
+import {pluralize} from '../../../utils/string-util';
 import {appContext} from '../../../services/app-context';
 import {
   computeLatestPatchNum,
@@ -367,6 +367,7 @@
     );
   }
 
+  // TODO(dhruvsri): have ported comments contribute to this count
   _computePatchSetCommentsString(
     changeComments: ChangeComments,
     patchNum: PatchSetNum
@@ -378,16 +379,11 @@
     const commentThreadCount = changeComments.computeCommentThreadCount({
       patchNum,
     });
-    const commentThreadString = GrCountStringFormatter.computePluralString(
-      commentThreadCount,
-      'comment'
-    );
+    const commentThreadString = pluralize(commentThreadCount, 'comment');
 
     const unresolvedCount = changeComments.computeUnresolvedNum({patchNum});
-    const unresolvedString = GrCountStringFormatter.computeString(
-      unresolvedCount,
-      'unresolved'
-    );
+    const unresolvedString =
+      unresolvedCount === 0 ? '' : `${unresolvedCount} unresolved`;
 
     if (!commentThreadString.length && !unresolvedString.length) {
       return '';
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 ff6efe6..ee52ab6 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
@@ -22,6 +22,7 @@
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-selection-action-box_html';
+import {fireEvent} from '../../../utils/event-util';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -122,11 +123,6 @@
     } // 0 = main button
     e.preventDefault();
     e.stopPropagation();
-    this.dispatchEvent(
-      new CustomEvent('create-comment-requested', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'create-comment-requested');
   }
 }
diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts
index f5e5e04..197a0c4 100644
--- a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.ts
@@ -304,7 +304,7 @@
     this._processPromise = util.makeCancelable(
       this._loadHLJS().then(
         () =>
-          new Promise(resolve => {
+          new Promise<void>(resolve => {
             const nextStep = () => {
               this._processHandle = null;
               this._processNextLine(state, rangesCache);
diff --git a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts
index c04e61b..7df3d75 100644
--- a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts
+++ b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.ts
@@ -17,7 +17,6 @@
 import '../../../styles/gr-table-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-list-view/gr-list-view';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts
index f05080e..b36edd4 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.ts
@@ -20,7 +20,6 @@
 import '../../shared/gr-dialog/gr-dialog';
 import '../../shared/gr-dropdown/gr-dropdown';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
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 83840a5f..197203f 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
@@ -18,7 +18,6 @@
 import '../../plugins/gr-endpoint-param/gr-endpoint-param';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-editable-label/gr-editable-label';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-storage/gr-storage';
 import '../gr-default-editor/gr-default-editor';
 import '../../../styles/shared-styles';
@@ -125,6 +124,8 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  reporting = appContext.reportingService;
+
   get keyBindings() {
     return {
       'ctrl+s meta+s': '_handleSaveShortcut',
@@ -330,7 +331,7 @@
     this._saveEdit().then(() => {
       const handleError: ErrorCallback = response => {
         this._showAlert(PUBLISH_FAILED_MSG);
-        console.error(response);
+        this.reporting.error(new Error(response?.statusText));
       };
 
       this._showAlert(PUBLISHING_EDIT_MSG);
diff --git a/polygerrit-ui/app/elements/gr-app-element.ts b/polygerrit-ui/app/elements/gr-app-element.ts
index 190818a..1d42bba 100644
--- a/polygerrit-ui/app/elements/gr-app-element.ts
+++ b/polygerrit-ui/app/elements/gr-app-element.ts
@@ -38,7 +38,6 @@
 import './settings/gr-registration-dialog/gr-registration-dialog';
 import './settings/gr-settings-view/gr-settings-view';
 import './shared/gr-lib-loader/gr-lib-loader';
-import './shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
@@ -49,7 +48,7 @@
   Shortcut,
   SPECIAL_SHORTCUT,
 } from '../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
-import {GerritNav, GerritView} from './core/gr-navigation/gr-navigation';
+import {GerritNav} from './core/gr-navigation/gr-navigation';
 import {appContext} from '../services/app-context';
 import {flush} from '@polymer/polymer/lib/utils/flush';
 import {customElement, observe, property} from '@polymer/decorators';
@@ -79,6 +78,7 @@
 } from '../types/events';
 import {ViewState} from '../types/types';
 import {EventType} from '../utils/event-util';
+import {GerritView} from '../services/router/router-model';
 
 interface ErrorInfo {
   text: string;
diff --git a/polygerrit-ui/app/elements/gr-app-element_html.ts b/polygerrit-ui/app/elements/gr-app-element_html.ts
index b978ed8..6116705 100644
--- a/polygerrit-ui/app/elements/gr-app-element_html.ts
+++ b/polygerrit-ui/app/elements/gr-app-element_html.ts
@@ -40,6 +40,11 @@
       border-left: 0;
       border-top: 0;
       box-shadow: var(--header-box-shadow);
+      /* Make sure the header is above the main content, to preserve box-shadow
+         visibility. We need 2 here instead of 1, because dropdowns in the
+         header should be shown on top of the sticky diff header, which has a
+         z-index of 1. */
+      z-index: 2;
     }
     footer {
       background: var(
diff --git a/polygerrit-ui/app/elements/gr-app-init.ts b/polygerrit-ui/app/elements/gr-app-init.ts
index 6d79ce1..ab38326 100644
--- a/polygerrit-ui/app/elements/gr-app-init.ts
+++ b/polygerrit-ui/app/elements/gr-app-init.ts
@@ -22,17 +22,6 @@
 } from '../services/gr-reporting/gr-reporting_impl';
 import {appContext} from '../services/app-context';
 
-interface UninitializedPolymer {
-  lazyRegister: boolean;
-}
-
-if (!window.Polymer) {
-  // Without as... it violates internal google rules.
-  ((window.Polymer as unknown) as UninitializedPolymer) = {
-    lazyRegister: true,
-  };
-}
-
 initAppContext();
 initVisibilityReporter(appContext);
 initPerformanceReporter(appContext);
diff --git a/polygerrit-ui/app/elements/gr-app-types.ts b/polygerrit-ui/app/elements/gr-app-types.ts
index b05117f..4809562 100644
--- a/polygerrit-ui/app/elements/gr-app-types.ts
+++ b/polygerrit-ui/app/elements/gr-app-types.ts
@@ -16,7 +16,6 @@
  */
 import {
   GenerateUrlParameters,
-  GerritView,
   GroupDetailView,
   RepoDetailView,
 } from './core/gr-navigation/gr-navigation';
@@ -28,6 +27,7 @@
   RepoName,
   UrlEncodedCommentId,
 } from '../types/common';
+import {GerritView} from '../services/router/router-model';
 
 export interface AppElement extends HTMLElement {
   params: AppElementParams | GenerateUrlParameters;
diff --git a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api-types.ts b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api-types.ts
index 063d89d..7343c3c 100644
--- a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api-types.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api-types.ts
@@ -67,8 +67,12 @@
    */
   loginCallback?: () => void;
 
-  runs: CheckRun[];
-  results: CheckResult[];
+  /**
+   * Top-level actions that are not associated with a specific run or result.
+   * Will be shown as buttons in the header of the Checks tab.
+   */
+  actions?: Action[];
+  runs?: CheckRun[];
 }
 
 export enum ResponseCode {
diff --git a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts
index 50b9222..beff673 100644
--- a/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api.ts
@@ -19,8 +19,8 @@
   ChecksApiConfig,
   ChecksProvider,
   GrChecksApiInterface,
-  ResponseCode,
 } from './gr-checks-api-types';
+import {appContext} from '../../../services/app-context';
 
 const DEFAULT_CONFIG: ChecksApiConfig = {
   fetchPollingIntervalSeconds: 60,
@@ -29,7 +29,6 @@
 enum State {
   NOT_REGISTERED,
   REGISTERED,
-  FETCHING,
 }
 
 /**
@@ -40,35 +39,24 @@
  * fetch() being called on the provider interface.
  */
 export class GrChecksApi implements GrChecksApiInterface {
-  private provider?: ChecksProvider;
-
-  config?: ChecksApiConfig;
-
   private state = State.NOT_REGISTERED;
 
+  private readonly checksService = appContext.checksService;
+
   constructor(readonly plugin: PluginApi) {}
 
   announceUpdate() {
-    // TODO(brohlfs): Implement!
+    this.checksService.announceUpdate(this.plugin.getPluginName());
   }
 
   register(provider: ChecksProvider, config?: ChecksApiConfig): void {
-    if (this.state !== State.NOT_REGISTERED || this.provider)
+    if (this.state === State.REGISTERED)
       throw new Error('Only one provider can be registered per plugin.');
     this.state = State.REGISTERED;
-    this.provider = provider;
-    this.config = config ?? DEFAULT_CONFIG;
-  }
-
-  async fetch(change: number, patchset: number) {
-    if (this.state === State.NOT_REGISTERED || !this.provider)
-      throw new Error('Cannot fetch checks without a registered provider.');
-    if (this.state === State.FETCHING) return;
-    this.state = State.FETCHING;
-    const response = await this.provider.fetch(change, patchset);
-    this.state = State.REGISTERED;
-    if (response.responseCode === ResponseCode.OK) {
-      // TODO(brohlfs): Do something with the response.
-    }
+    this.checksService.register(
+      this.plugin.getPluginName(),
+      provider,
+      config ?? DEFAULT_CONFIG
+    );
   }
 }
diff --git a/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command.ts b/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command.ts
index b3a40c5..a9aba13 100644
--- a/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-repo-api/gr-plugin-repo-command.ts
@@ -17,6 +17,7 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-plugin-repo-command_html';
 import {customElement, property} from '@polymer/decorators';
+import {fireEvent} from '../../../utils/event-util';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -33,8 +34,6 @@
   }
 
   _handleClick() {
-    this.dispatchEvent(
-      new CustomEvent('command-tap', {composed: true, bubbles: true})
-    );
+    fireEvent(this, 'command-tap');
   }
 }
diff --git a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts
index a7b6a6c..5786576 100644
--- a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts
+++ b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../shared/gr-avatar/gr-avatar';
 import '../../shared/gr-date-formatter/gr-date-formatter';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
@@ -28,6 +27,7 @@
 import {AccountInfo, ServerInfo} from '../../../types/common';
 import {EditableAccountField} from '../../../constants/constants';
 import {appContext} from '../../../services/app-context';
+import {fireEvent} from '../../../utils/event-util';
 
 @customElement('gr-account-info')
 export class GrAccountInfo extends GestureEventListeners(
@@ -152,12 +152,7 @@
         this._hasDisplayNameChange = false;
         this._hasStatusChange = false;
         this._saving = false;
-        this.dispatchEvent(
-          new CustomEvent('account-detail-update', {
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireEvent(this, 'account-detail-update');
       });
   }
 
diff --git a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts
index 243a40d..da180c3 100644
--- a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts
+++ b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.ts
@@ -17,7 +17,6 @@
 
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts
index c0d6126..df927d6 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.ts
@@ -16,7 +16,6 @@
  */
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-date-formatter/gr-date-formatter';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import '../../../styles/gr-form-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
@@ -25,7 +24,9 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-change-table-editor_html';
 import {ChangeTableMixin} from '../../../mixins/gr-change-table-mixin/gr-change-table-mixin';
-import {customElement, property} from '@polymer/decorators';
+import {customElement, property, observe} from '@polymer/decorators';
+import {ServerInfo} from '../../../types/common';
+import {appContext} from '../../../services/app-context';
 
 @customElement('gr-change-table-editor')
 class GrChangeTableEditor extends ChangeTableMixin(
@@ -41,6 +42,27 @@
   @property({type: Boolean, notify: true})
   showNumber?: boolean;
 
+  @property({type: Object})
+  serverConfig?: ServerInfo;
+
+  @property({type: Array})
+  defaultColumns?: string[];
+
+  flagsService = appContext.flagsService;
+
+  @observe('serverConfig')
+  _configChanged(config: ServerInfo) {
+    this.defaultColumns = this.getEnabledColumns(
+      this.columnNames,
+      config,
+      this.flagsService.enabledExperiments
+    );
+    if (!this.displayedColumns) return;
+    this.displayedColumns = this.displayedColumns.filter(column =>
+      this.isColumnEnabled(column, config, this.flagsService.enabledExperiments)
+    );
+  }
+
   /**
    * Get the list of enabled column names from whichever checkboxes are
    * checked (excluding the number checkbox).
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
index 1233cf1..4c87d83 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_html.ts
@@ -61,7 +61,7 @@
             />
           </td>
         </tr>
-        <template is="dom-repeat" items="[[columnNames]]">
+        <template is="dom-repeat" items="[[defaultColumns]]">
           <tr>
             <td>[[item]]</td>
             <td
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.js b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.js
index 42085ff..db5c035 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.js
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor_test.js
@@ -41,6 +41,9 @@
 
     element.set('displayedColumns', columns);
     element.showNumber = false;
+    element.serverConfig = {
+      change: {},
+    };
     flush();
   });
 
@@ -51,13 +54,25 @@
 
     // The `+ 1` is for the number column, which isn't included in the change
     // table behavior's list.
-    assert.equal(rows.length, element.columnNames.length + 1);
-    for (let i = 0; i < columns.length; i++) {
+    assert.equal(rows.length, element.defaultColumns.length + 1);
+    for (let i = 0; i < element.defaultColumns.length; i++) {
       tds = rows[i + 1].querySelectorAll('td');
-      assert.equal(tds[0].textContent, columns[i]);
+      assert.equal(tds[0].textContent, element.defaultColumns[i]);
     }
   });
 
+  test('disabled experiments are hidden', () => {
+    assert.isFalse(element.displayedColumns.includes('Assignee'));
+    element.set('displayedColumns', columns);
+    element.serverConfig = {
+      change: {
+        enable_assignee: true,
+      },
+    };
+    flush();
+    assert.isTrue(element.displayedColumns.includes('Assignee'));
+  });
+
   test('hide item', () => {
     const checkbox = element.shadowRoot
         .querySelector('table tr:nth-child(2) input');
@@ -80,6 +95,10 @@
       'Branch',
       'Updated',
     ]);
+    // trigger computation of enabled displayed columns
+    element.serverConfig = {
+      change: {},
+    };
     flush();
     const checkbox = element.shadowRoot
         .querySelector('table tr:nth-child(2) input');
@@ -97,12 +116,15 @@
   });
 
   test('_getDisplayedColumns', () => {
-    assert.deepEqual(element._getDisplayedColumns(), columns);
+    const enabledColumns = columns.filter(column => element.isColumnEnabled(
+        column, element.serverConfig, []
+    ));
+    assert.deepEqual(element._getDisplayedColumns(), enabledColumns);
     MockInteractions.tap(
         element.shadowRoot
-            .querySelector('.checkboxContainer input[name=Assignee]'));
+            .querySelector('.checkboxContainer input[name=Subject]'));
     assert.deepEqual(element._getDisplayedColumns(),
-        columns.filter(c => c !== 'Assignee'));
+        enabledColumns.filter(c => c !== 'Subject'));
   });
 
   test('_handleCheckboxContainerClick relays taps to checkboxes', () => {
@@ -140,12 +162,12 @@
 
   test('_handleTargetClick', () => {
     sinon.spy(element, '_handleTargetClick');
-    assert.include(element.displayedColumns, 'Assignee');
+    assert.include(element.displayedColumns, 'Subject');
     MockInteractions
         .tap(element.shadowRoot
-            .querySelector('.checkboxContainer input[name=Assignee]'));
+            .querySelector('.checkboxContainer input[name=Subject]'));
     assert.isTrue(element._handleTargetClick.calledOnce);
-    assert.notInclude(element.displayedColumns, 'Assignee');
+    assert.notInclude(element.displayedColumns, 'Subject');
   });
 });
 
diff --git a/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.ts b/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.ts
index 2e4cb8c..68785e7 100644
--- a/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.ts
+++ b/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.ts
@@ -19,7 +19,6 @@
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.ts b/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.ts
index da99583..411d3aa 100644
--- a/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.ts
+++ b/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.ts b/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.ts
index 9db3e4d..9960d83 100644
--- a/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.ts
@@ -16,7 +16,6 @@
  */
 import '@polymer/iron-input/iron-input';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.ts b/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.ts
index 087fe7c..0fd0ad9 100644
--- a/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.ts
@@ -19,7 +19,6 @@
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-copy-clipboard/gr-copy-clipboard';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.ts b/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.ts
index 30146bc..c69bebd 100644
--- a/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.ts
+++ b/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.ts
@@ -16,7 +16,6 @@
  */
 import '../../../styles/shared-styles';
 import '../../../styles/gr-form-styles';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts
index 424e30e..9bb4b00 100644
--- a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts
+++ b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.ts
@@ -18,7 +18,6 @@
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-copy-clipboard/gr-copy-clipboard';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.ts b/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.ts
index 4222b03..837332a 100644
--- a/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.ts
+++ b/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.ts
@@ -19,7 +19,6 @@
 import '../../admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts
index 0498b35..805c9ca 100644
--- a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-date-formatter/gr-date-formatter';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import '../../../styles/gr-form-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
diff --git a/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.ts b/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.ts
index 793900b..85e692d 100644
--- a/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.ts
+++ b/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../../styles/gr-form-styles';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
@@ -27,6 +26,7 @@
 import {ServerInfo, AccountDetailInfo} from '../../../types/common';
 import {EditableAccountField} from '../../../constants/constants';
 import {appContext} from '../../../services/app-context';
+import {fireEvent} from '../../../utils/event-util';
 
 export interface GrRegistrationDialog {
   $: {
@@ -136,12 +136,7 @@
 
     return Promise.all(promises).then(() => {
       this._saving = false;
-      this.dispatchEvent(
-        new CustomEvent('account-detail-update', {
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireEvent(this, 'account-detail-update');
     });
   }
 
@@ -157,12 +152,7 @@
 
   close() {
     this._saving = true; // disable buttons indefinitely
-    this.dispatchEvent(
-      new CustomEvent('close', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'close');
   }
 
   _computeSaveDisabled(name?: string, email?: string, saving?: boolean) {
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 bf739c7..809139d 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.ts
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.ts
@@ -30,7 +30,6 @@
 import '../../shared/gr-date-formatter/gr-date-formatter';
 import '../../shared/gr-diff-preferences/gr-diff-preferences';
 import '../../shared/gr-page-nav/gr-page-nav';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../shared/gr-select/gr-select';
 import '../gr-account-info/gr-account-info';
 import '../gr-agreements-list/gr-agreements-list';
@@ -64,11 +63,11 @@
 } from '../../../types/common';
 import {GrSshEditor} from '../gr-ssh-editor/gr-ssh-editor';
 import {GrGpgEditor} from '../gr-gpg-editor/gr-gpg-editor';
-import {GerritView} from '../../core/gr-navigation/gr-navigation';
 import {GrEmailEditor} from '../gr-email-editor/gr-email-editor';
 import {CustomKeyboardEvent} from '../../../types/events';
 import {fireAlert, fireTitleChange} from '../../../utils/event-util';
 import {appContext} from '../../../services/app-context';
+import {GerritView} from '../../../services/router/router-model';
 
 const PREFS_SECTION_FIELDS: Array<keyof PreferencesInput> = [
   'changes_per_page',
@@ -148,9 +147,6 @@
   @property({type: Boolean})
   _accountInfoChanged?: boolean;
 
-  @property({type: Array})
-  _changeTableColumnsNotDisplayed?: string[];
-
   @property({type: Object})
   _localPrefs: PreferencesInput = {};
 
@@ -242,8 +238,11 @@
         this.prefs = prefs;
         this._showNumber = !!prefs.legacycid_in_change_table;
         this._copyPrefs(CopyPrefsDirection.PrefsToLocalPrefs);
-        this._cloneMenu(prefs.my);
-        this._cloneChangeTableColumns(prefs.change_table);
+        this._localMenu = this._cloneMenu(prefs.my);
+        this._localChangeTableColumns =
+          prefs.change_table.length === 0
+            ? this.columnNames
+            : this.renameProjectToRepoColumn(prefs.change_table);
       })
     );
 
@@ -342,29 +341,10 @@
   }
 
   _cloneMenu(prefs: TopMenuItemInfo[]) {
-    const menu = [];
-    for (const item of prefs) {
-      menu.push({
-        name: item.name,
-        url: item.url,
-        target: item.target,
-      });
-    }
-    this._localMenu = menu;
-  }
-
-  _cloneChangeTableColumns(changeTable: string[]) {
-    let columns = this.getVisibleColumns(changeTable);
-
-    if (columns.length === 0) {
-      columns = this.columnNames;
-      this._changeTableColumnsNotDisplayed = [];
-    } else {
-      this._changeTableColumnsNotDisplayed = this.getComplementColumns(
-        changeTable
-      );
-    }
-    this._localChangeTableColumns = columns;
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    return prefs.map(({id, ...item}) => {
+      return item;
+    });
   }
 
   @observe('_localChangeTableColumns', '_showNumber')
@@ -438,7 +418,6 @@
   _handleSaveChangeTable() {
     this.set('prefs.change_table', this._localChangeTableColumns);
     this.set('prefs.legacycid_in_change_table', this._showNumber);
-    this._cloneChangeTableColumns(this._localChangeTableColumns);
     return this.restApiService.savePreferences(this.prefs).then(() => {
       this._changeTableChanged = false;
     });
@@ -454,7 +433,6 @@
 
   _handleSaveMenu() {
     this.set('prefs.my', this._localMenu);
-    this._cloneMenu(this._localMenu);
     return this.restApiService.savePreferences(this.prefs).then(() => {
       this._menuChanged = false;
     });
@@ -463,7 +441,7 @@
   _handleResetMenuButton() {
     return this.restApiService.getDefaultPreferences().then(data => {
       if (data?.my) {
-        this._cloneMenu(data.my);
+        this._localMenu = this._cloneMenu(data.my);
       }
     });
   }
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 d1d412f..ec8f6e7 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
@@ -340,6 +340,7 @@
       <fieldset id="changeTableColumns">
         <gr-change-table-editor
           show-number="{{_showNumber}}"
+          server-config="[[_serverConfig]]"
           displayed-columns="{{_localChangeTableColumns}}"
         >
         </gr-change-table-editor>
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_test.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_test.js
index a01edac..4c5a2a2 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_test.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view_test.js
@@ -19,7 +19,7 @@
 import {getComputedStyleValue} from '../../../utils/dom-util.js';
 import './gr-settings-view.js';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom.js';
-import {GerritView} from '../../core/gr-navigation/gr-navigation.js';
+import {GerritView} from '../../../services/router/router-model.js';
 
 const basicFixture = fixtureFromElement('gr-settings-view');
 const blankFixture = fixtureFromElement('div');
@@ -351,9 +351,7 @@
     let newColumns = ['Owner', 'Project', 'Branch'];
     element._localChangeTableColumns = newColumns.slice(0);
     element._showNumber = false;
-    const cloneStub = sinon.stub(element, '_cloneChangeTableColumns');
     element._handleSaveChangeTable();
-    assert.isTrue(cloneStub.calledOnce);
     assert.deepEqual(element.prefs.change_table, newColumns);
     assert.isNotOk(element.prefs.legacycid_in_change_table);
 
@@ -361,7 +359,6 @@
     element._localChangeTableColumns = newColumns;
     element._showNumber = true;
     element._handleSaveChangeTable();
-    assert.isTrue(cloneStub.calledTwice);
     assert.deepEqual(element.prefs.change_table, newColumns);
     assert.isTrue(element.prefs.legacycid_in_change_table);
   });
diff --git a/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.ts b/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.ts
index d4de208..b30b2cb 100644
--- a/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.ts
@@ -19,7 +19,6 @@
 import '../../shared/gr-button/gr-button';
 import '../../shared/gr-copy-clipboard/gr-copy-clipboard';
 import '../../shared/gr-overlay/gr-overlay';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
diff --git a/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.ts b/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.ts
index 58be0f7..36444a3 100644
--- a/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.ts
+++ b/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../shared/gr-autocomplete/gr-autocomplete';
 import '../../shared/gr-button/gr-button';
-import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/gr-form-styles';
 import '../../../styles/shared-styles';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
@@ -83,7 +82,7 @@
   }
 
   save() {
-    let deletePromise;
+    let deletePromise: Promise<Response | undefined>;
     if (this._projectsToRemove.length) {
       deletePromise = this.restApiService.deleteWatchedProjects(
         this._projectsToRemove
diff --git a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts
index 65bf55d3d..8ff7a3a 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.ts
@@ -17,7 +17,6 @@
 import '../gr-account-link/gr-account-link';
 import '../gr-button/gr-button';
 import '../gr-icons/gr-icons';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.ts b/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.ts
index 925480f..2562a1a 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.ts
@@ -16,7 +16,6 @@
  */
 import '../../../styles/shared-styles';
 import '../gr-autocomplete/gr-autocomplete';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts
index b37645e..a6c4201 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.ts
@@ -18,7 +18,6 @@
 import '../../../styles/shared-styles';
 import '../gr-avatar/gr-avatar';
 import '../gr-hovercard-account/gr-hovercard-account';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
@@ -30,6 +29,7 @@
 import {ReportingService} from '../../../services/gr-reporting/gr-reporting';
 import {ChangeInfo, AccountInfo, ServerInfo} from '../../../types/common';
 import {hasOwnProperty} from '../../../utils/common-util';
+import {fireEvent} from '../../../utils/event-util';
 
 @customElement('gr-account-label')
 export class GrAccountLabel extends GestureEventListeners(
@@ -235,9 +235,7 @@
         reason
       )
       .then(() => {
-        this.dispatchEvent(
-          new CustomEvent('hide-alert', {bubbles: true, composed: true})
-        );
+        fireEvent(this, 'hide-alert');
       });
   }
 
diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.ts b/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.ts
index b7c7b69..aff6d50 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.ts
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.ts
@@ -27,6 +27,7 @@
 import {customElement, property, observe} from '@polymer/decorators';
 import {IronFitBehavior} from '@polymer/iron-fit-behavior/iron-fit-behavior';
 import {GrCursorManager} from '../gr-cursor-manager/gr-cursor-manager';
+import {fireEvent} from '../../../utils/event-util';
 
 export interface GrAutocompleteDropdown {
   $: {
@@ -204,12 +205,7 @@
   }
 
   _fireClose() {
-    this.dispatchEvent(
-      new CustomEvent('dropdown-closed', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'dropdown-closed');
   }
 
   getCursorTarget() {
diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts
index 06555a7..6151a1d9 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.ts
@@ -30,6 +30,7 @@
 import {GrCursorManager} from '../gr-cursor-manager/gr-cursor-manager';
 import {PaperInputElementExt} from '../../../types/types';
 import {CustomKeyboardEvent} from '../../../types/events';
+import {fireEvent} from '../../../utils/event-util';
 
 const TOKENIZE_REGEX = /(?:[^\s"]+|"[^"]*")+/g;
 const DEBOUNCE_WAIT_MS = 200;
@@ -404,12 +405,7 @@
     if (this._suggestions.length) {
       this.set('_suggestions', []);
     } else {
-      this.dispatchEvent(
-        new CustomEvent('cancel', {
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireEvent(this, 'cancel');
     }
   }
 
diff --git a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts
index f8042a5..38f5196 100644
--- a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts
+++ b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts
@@ -16,7 +16,6 @@
  */
 import '../../../styles/shared-styles';
 import '../gr-js-api-interface/gr-js-api-interface';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
diff --git a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.ts b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.ts
index 44ec4f5..d83ca49 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.ts
+++ b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-tooltip-content/gr-tooltip-content';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
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 30f7ff2..dd48556 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
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 import '../../../styles/shared-styles';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-storage/gr-storage';
 import '../gr-comment/gr-comment';
 import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
@@ -173,6 +172,9 @@
   showFileName = true;
 
   @property({type: Boolean})
+  showPortedComment = false;
+
+  @property({type: Boolean})
   showPatchset = true;
 
   get keyBindings() {
@@ -243,20 +245,24 @@
     );
   }
 
-  _getDiffUrlForPath(path: string) {
-    if (!this.changeNum) throw new Error('changeNum is missing');
-    if (!this.projectName) throw new Error('projectName is missing');
+  _getDiffUrlForPath(
+    projectName?: RepoName,
+    changeNum?: NumericChangeId,
+    path?: string,
+    patchNum?: PatchSetNum
+  ) {
+    if (!changeNum || !projectName || !path) return undefined;
     if (isDraft(this.comments[0])) {
       return GerritNav.getUrlForDiffById(
-        this.changeNum,
-        this.projectName,
+        changeNum,
+        projectName,
         path,
-        this.patchNum
+        patchNum
       );
     }
     const id = this.comments[0].id;
     if (!id) throw new Error('A published comment is missing the id.');
-    return GerritNav.getUrlForComment(this.changeNum, this.projectName, id);
+    return GerritNav.getUrlForComment(changeNum, projectName, id);
   }
 
   _getDiffUrlForComment(
@@ -288,6 +294,11 @@
     return path === SpecialFilePath.PATCHSET_LEVEL_COMMENTS;
   }
 
+  _computeShowPortedComment(comment: UIComment) {
+    if (this._orderedComments.length === 0) return false;
+    return this.showPortedComment && comment.id === this._orderedComments[0].id;
+  }
+
   _computeDisplayPath(path: string) {
     const displayPath = computeDisplayPath(path);
     if (displayPath === SpecialFilePath.PATCHSET_LEVEL_COMMENTS) {
@@ -401,15 +412,6 @@
     if (!id) throw new Error('Cannot reply to comment without id.');
     const reply = this._newReply(id, content, unresolved);
 
-    // If there is currently a comment in an editing state, add an attribute
-    // so that the gr-comment knows not to populate the draft text.
-    for (let i = 0; i < this.comments.length; i++) {
-      if (this.comments[i].__editing) {
-        reply.__otherEditing = true;
-        break;
-      }
-    }
-
     if (isEditing) {
       reply.__editing = true;
     }
@@ -508,7 +510,6 @@
       if (rootComment.patch_set !== undefined)
         d.patch_set = rootComment.patch_set;
       if (rootComment.side !== undefined) d.side = rootComment.side;
-      if (rootComment.diffSide !== undefined) d.diffSide = rootComment.diffSide;
       if (rootComment.line !== undefined) d.line = rootComment.line;
       if (rootComment.range !== undefined) d.range = rootComment.range;
       if (rootComment.parent !== undefined) d.parent = rootComment.parent;
@@ -517,7 +518,6 @@
       d.path = this.path;
       d.patch_set = this.patchNum;
       d.side = this._getSide(this.isOnParent);
-      d.diffSide = this.diffSide;
 
       if (lineNum && lineNum !== FILE) {
         d.line = lineNum;
@@ -568,7 +568,7 @@
     // Check to see if there are any other open comments getting edited and
     // set the local storage value to its message value.
     for (const changeComment of this.comments) {
-      if (changeComment.__editing) {
+      if (isDraft(changeComment) && changeComment.__editing) {
         const commentLocation: StorageLocation = {
           changeNum: this.changeNum,
           patchNum: this.patchNum,
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 cd274fb..dd9f9e8 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
@@ -83,7 +83,9 @@
           <span> [[_computeDisplayPath(path)]] </span>
         </template>
         <template is="dom-if" if="[[!_isPatchsetLevelComment(path)]]">
-          <a href$="[[_getDiffUrlForPath(path)]]">
+          <a
+            href$="[[_getDiffUrlForPath(projectName, changeNum, path, patchNum)]]"
+          >
             [[_computeDisplayPath(path)]]
           </a>
         </template>
@@ -113,11 +115,12 @@
         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]]"
-        diff-side="[[comment.diffSide]]"
+        show-ported-comment="[[_computeShowPortedComment(comment)]]"
         side="[[comment.side]]"
         project-config="[[_projectConfig]]"
         on-create-fix-comment="_handleCommentFix"
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 a6ead90..c8409fa 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
@@ -44,6 +44,7 @@
   tap,
   pressAndReleaseKeyOn,
 } from '@polymer/iron-test-helpers/mock-interactions';
+import {html} from '@polymer/polymer/lib/utils/html-tag.js';
 
 const basicFixture = fixtureFromElement('gr-comment-thread');
 
@@ -66,6 +67,14 @@
       flush();
     });
 
+    test('renders without patchNum and changeNum', async () => {
+      const fixture = fixtureFromTemplate(
+        html`<gr-comment-thread show-file-path="" path="path/to/file"></gr-change-metadata>`
+      );
+      fixture.instantiate();
+      await flush();
+    });
+
     test('comments are sorted correctly', () => {
       const comments: UIComment[] = [
         {
@@ -348,7 +357,6 @@
         path: '/path/to/file.txt',
         unresolved: true,
         patch_set: 3 as PatchSetNum,
-        diffSide: Side.LEFT,
       },
     ];
     flush();
@@ -606,31 +614,6 @@
     );
   });
 
-  test('first editing comment does not add __otherEditing attribute', () => {
-    element.comments = [
-      {
-        author: {
-          name: 'Mr. Peanutbutter',
-          email: ('tenn1sballchaser@aol.com' as EmailAddress) as EmailAddress,
-        },
-        id: 'baf0414d_60047215' as UrlEncodedCommentId,
-        line: 5,
-        path: 'test',
-        message: 'is this a crossover episode!?',
-        updated: '2015-12-08 19:48:33.843000000' as Timestamp,
-        __draft: true,
-      },
-    ];
-
-    const replyBtn = element.$.replyBtn;
-    tap(replyBtn);
-    flush();
-
-    const editing = element._orderedComments.filter(c => c.__editing === true);
-    assert.equal(editing.length, 1);
-    assert.equal(!!editing[0].__otherEditing, false);
-  });
-
   test(
     'When not editing other comments, local storage not set' + ' after discard',
     done => {
@@ -833,7 +816,6 @@
 
   test('_newDraft with root', () => {
     const draft = element._newDraft();
-    assert.equal(draft.diffSide, Side.LEFT);
     assert.equal(draft.patch_set, 3 as PatchSetNum);
   });
 
@@ -842,7 +824,6 @@
     element.diffSide = Side.RIGHT;
     element.patchNum = 2 as PatchSetNum;
     const draft = element._newDraft();
-    assert.equal(draft.diffSide, Side.RIGHT);
     assert.equal(draft.patch_set, 2 as PatchSetNum);
   });
 
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index 129f85f..3dd851e 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -24,7 +24,6 @@
 import '../gr-formatted-text/gr-formatted-text';
 import '../gr-icons/gr-icons';
 import '../gr-overlay/gr-overlay';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-storage/gr-storage';
 import '../gr-textarea/gr-textarea';
 import '../gr-tooltip-content/gr-tooltip-content';
@@ -39,6 +38,7 @@
 import {getRootElement} from '../../../scripts/rootElement';
 import {appContext} from '../../../services/app-context';
 import {customElement, observe, property} from '@polymer/decorators';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation';
 import {GrTextarea} from '../gr-textarea/gr-textarea';
 import {GrStorage, StorageLocation} from '../gr-storage/gr-storage';
 import {GrOverlay} from '../gr-overlay/gr-overlay';
@@ -47,11 +47,11 @@
   NumericChangeId,
   ConfigInfo,
   PatchSetNum,
+  RepoName,
 } from '../../../types/common';
 import {GrButton} from '../gr-button/gr-button';
 import {GrConfirmDeleteCommentDialog} from '../gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog';
 import {GrDialog} from '../gr-dialog/gr-dialog';
-import {Side} from '../../../constants/constants';
 import {
   isDraft,
   UIComment,
@@ -60,13 +60,11 @@
 } from '../../../utils/comment-util';
 import {OpenFixPreviewEventDetail} from '../../../types/events';
 import {fireAlert} from '../../../utils/event-util';
+import {pluralize} from '../../../utils/string-util';
 
 const STORAGE_DEBOUNCE_INTERVAL = 400;
 const TOAST_DEBOUNCE_INTERVAL = 200;
 
-const SAVING_MESSAGE = 'Saving';
-const DRAFT_SINGULAR = 'draft...';
-const DRAFT_PLURAL = 'drafts...';
 const SAVED_MESSAGE = 'All changes saved';
 const UNSAVED_MESSAGE = 'Unable to save draft';
 
@@ -156,11 +154,14 @@
   @property({type: Number})
   changeNum?: NumericChangeId;
 
+  @property({type: String})
+  projectName?: RepoName;
+
   @property({type: Object, notify: true, observer: '_commentChanged'})
-  comment?: UIComment | UIRobot;
+  comment?: UIComment;
 
   @property({type: Array})
-  comments?: (UIComment | UIRobot)[];
+  comments?: UIComment[];
 
   @property({type: Boolean, reflectToAttribute: true})
   isRobotComment = false;
@@ -219,9 +220,6 @@
   _messageText = '';
 
   @property({type: String})
-  diffSide?: Side;
-
-  @property({type: String})
   side?: string;
 
   @property({type: Boolean})
@@ -261,6 +259,9 @@
   @property({type: Object})
   _selfAccount?: AccountDetailInfo;
 
+  @property({type: Boolean})
+  showPortedComment = false;
+
   get keyBindings() {
     return {
       'ctrl+enter meta+enter ctrl+s meta+s': '_handleSaveKey',
@@ -301,6 +302,16 @@
     return comment.author || this._selfAccount;
   }
 
+  _getUrlForComment(comment: UIComment) {
+    if (!this.changeNum || !this.projectName) return '';
+    if (!comment.id) throw new Error('comment must have an id');
+    return GerritNav.getUrlForComment(
+      this.changeNum as NumericChangeId,
+      this.projectName,
+      comment.id
+    );
+  }
+
   @observe('editing')
   _onEditingChange(editing?: boolean) {
     this.dispatchEvent(
@@ -450,7 +461,6 @@
           if (this.comment?.__draftID) {
             resComment.__draftID = this.comment.__draftID;
           }
-          resComment.diffSide = this.diffSide;
           this.comment = resComment;
           this._fireSave();
           return obj;
@@ -483,7 +493,7 @@
   }
 
   _commentChanged(comment: UIComment) {
-    this.editing = !!comment.__editing;
+    this.editing = isDraft(comment) && !!comment.__editing;
     this.resolved = !comment.unresolved;
     if (this.editing) {
       // It's a new draft/reply, notify.
@@ -553,7 +563,7 @@
         cancelButton.hidden = !editing;
       }
     }
-    if (this.comment) {
+    if (isDraft(this.comment)) {
       this.comment.__editing = this.editing;
     }
     if (!!editing !== !!previousValue) {
@@ -815,11 +825,7 @@
     if (numPending === 0) {
       return SAVED_MESSAGE;
     }
-    return [
-      SAVING_MESSAGE,
-      numPending,
-      numPending === 1 ? DRAFT_SINGULAR : DRAFT_PLURAL,
-    ].join(' ');
+    return `Saving ${pluralize(numPending, 'draft')}...`;
   }
 
   _showStartRequest() {
@@ -927,17 +933,7 @@
 
     // Only apply local drafts to comments that haven't been saved
     // remotely, and haven't been given a default message already.
-    //
-    // Don't get local draft if there is another comment that is currently
-    // in an editing state.
-    if (
-      !comment ||
-      comment.id ||
-      comment.message ||
-      comment.__otherEditing ||
-      !comment.path
-    ) {
-      if (comment) delete comment.__otherEditing;
+    if (!comment || comment.id || comment.message || !comment.path) {
       return;
     }
 
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
index 64f0be1..d9a3187 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
@@ -245,6 +245,9 @@
     .draft gr-account-label {
       width: unset;
     }
+    .portedMessage {
+      margin: 0 var(--spacing-m);
+    }
   </style>
   <div id="container" class="container">
     <div class="header" id="header" on-click="_handleToggleCollapsed">
@@ -260,6 +263,13 @@
           >
           </gr-account-label>
         </template>
+        <template is="dom-if" if="[[showPortedComment]]">
+          <a href="[[_getUrlForComment(comment)]]">
+            <span class="portedMessage">
+              Ported from patchset [[comment.patch_set]]
+            </span>
+          </a>
+        </template>
         <gr-tooltip-content
           class="draftTooltip"
           has-tooltip=""
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.js b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.js
index fa092f1..cc89a7e 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_test.js
@@ -129,7 +129,6 @@
           email: 'tenn1sballchaser@aol.com',
         },
         line: 5,
-        __otherEditing: true,
       };
       flush(() => {
         assert.isTrue(loadSpy.called);
@@ -732,7 +731,7 @@
         path: SpecialFilePath.PATCHSET_LEVEL_COMMENTS, line: undefined,
         range: undefined};
       element.comment = comment;
-      flushAsynchronousOperations();
+      flush();
       MockInteractions.tap(element.shadowRoot
           .querySelector('.edit'));
       assert.isTrue(element.editing);
@@ -910,7 +909,6 @@
 
         assert.deepEqual(dispatchEventStub.lastCall.args[0].detail, {
           comment: {
-            diffSide: Side.RIGHT,
             __draft: true,
             __draftID: 'temp_draft_id',
             id: 'baf0414d_40572e03',
@@ -1265,7 +1263,7 @@
       element = draftFixture.instantiate();
       // fake random
       element.getRandomNum = () => 0;
-      element.comment = {__editing: true};
+      element.comment = {__editing: true, __draft: true};
       flush(() => {
         assert.isTrue(respectfulGetStub.called);
         assert.isTrue(respectfulSetStub.called);
@@ -1288,7 +1286,7 @@
       element = draftFixture.instantiate();
       // fake random
       element.getRandomNum = () => 0;
-      element.comment = {__editing: true};
+      element.comment = {__editing: true, __draft: true};
       flush(() => {
         assert.isTrue(respectfulGetStub.called);
         assert.isTrue(respectfulSetStub.called);
@@ -1317,7 +1315,7 @@
       element = draftFixture.instantiate();
       // fake random
       element.getRandomNum = () => 3;
-      element.comment = {__editing: true};
+      element.comment = {__editing: true, __draft: true};
       flush(() => {
         assert.isTrue(respectfulGetStub.called);
         assert.isFalse(respectfulSetStub.called);
@@ -1372,7 +1370,7 @@
       element = draftFixture.instantiate();
       // fake random
       element.getRandomNum = () => 0;
-      element.comment = {__editing: true};
+      element.comment = {__editing: true, __draft: true};
       flush(() => {
         assert.isTrue(respectfulGetStub.called);
         assert.isFalse(respectfulSetStub.called);
diff --git a/polygerrit-ui/app/elements/shared/gr-count-string-formatter/gr-count-string-formatter.ts b/polygerrit-ui/app/elements/shared/gr-count-string-formatter/gr-count-string-formatter.ts
deleted file mode 100644
index bbbce16..0000000
--- a/polygerrit-ui/app/elements/shared/gr-count-string-formatter/gr-count-string-formatter.ts
+++ /dev/null
@@ -1,44 +0,0 @@
-/**
- * @license
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-export const GrCountStringFormatter = {
-  /**
-   * Returns a count plus string that is pluralized when necessary.
-   */
-  computePluralString(count: number, noun: string): string {
-    return this.computeString(count, noun) + (count > 1 ? 's' : '');
-  },
-
-  /**
-   * Returns a count plus string that is not pluralized.
-   */
-  computeString(count: number, noun: string): string {
-    if (count === 0) {
-      return '';
-    }
-    return `${count} ${noun}`;
-  },
-
-  /**
-   * Returns a count plus arbitrary text.
-   */
-  computeShortString(count: number, text: string): string {
-    if (count === 0) {
-      return '';
-    }
-    return `${count}${text}`;
-  },
-};
diff --git a/polygerrit-ui/app/elements/shared/gr-count-string-formatter/gr-count-string-formatter_test.js b/polygerrit-ui/app/elements/shared/gr-count-string-formatter/gr-count-string-formatter_test.js
deleted file mode 100644
index 36637ec..0000000
--- a/polygerrit-ui/app/elements/shared/gr-count-string-formatter/gr-count-string-formatter_test.js
+++ /dev/null
@@ -1,47 +0,0 @@
-/**
- * @license
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import '../../../test/common-test-setup-karma.js';
-import {GrCountStringFormatter} from './gr-count-string-formatter.js';
-
-suite('gr-count-string-formatter tests', () => {
-  test('computeString', () => {
-    const noun = 'unresolved';
-    assert.equal(GrCountStringFormatter.computeString(0, noun), '');
-    assert.equal(GrCountStringFormatter.computeString(1, noun),
-        '1 unresolved');
-    assert.equal(GrCountStringFormatter.computeString(2, noun),
-        '2 unresolved');
-  });
-
-  test('computeShortString', () => {
-    const noun = 'c';
-    assert.equal(GrCountStringFormatter.computeShortString(0, noun), '');
-    assert.equal(GrCountStringFormatter.computeShortString(1, noun), '1c');
-    assert.equal(GrCountStringFormatter.computeShortString(2, noun), '2c');
-  });
-
-  test('computePluralString', () => {
-    const noun = 'comment';
-    assert.equal(GrCountStringFormatter.computePluralString(0, noun), '');
-    assert.equal(GrCountStringFormatter.computePluralString(1, noun),
-        '1 comment');
-    assert.equal(GrCountStringFormatter.computePluralString(2, noun),
-        '2 comments');
-  });
-});
-
diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts
index a4e2a39..5bb4f4c 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.ts b/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.ts
index 9ede8cc..5810222 100644
--- a/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.ts
+++ b/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-input/iron-input';
 import '../../../styles/shared-styles';
 import '../gr-button/gr-button';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-select/gr-select';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts
index 34595cc..d2f003b7 100644
--- a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts
+++ b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.ts
@@ -16,7 +16,6 @@
  */
 import '@polymer/paper-tabs/paper-tabs';
 import '../gr-shell-command/gr-shell-command';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../../../styles/shared-styles';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts
index 2ea72ca..3fce16e 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.ts
@@ -21,6 +21,7 @@
 import '../gr-button/gr-button';
 import '../gr-date-formatter/gr-date-formatter';
 import '../gr-select/gr-select';
+import '../gr-file-status-chip/gr-file-status-chip';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
@@ -28,12 +29,7 @@
 import {customElement, property, observe} from '@polymer/decorators';
 import {IronDropdownElement} from '@polymer/iron-dropdown/iron-dropdown';
 import {Timestamp} from '../../../types/common';
-
-/**
- * fired when the selected value of the dropdown changes
- *
- * @event {change}
- */
+import {NormalizedFileInfo} from '../../change/gr-file-list/gr-file-list';
 
 /**
  * Requred values are text and value. mobileText and triggerText will
@@ -52,6 +48,7 @@
   mobileText?: string;
   date?: Timestamp;
   disabled?: boolean;
+  file?: NormalizedFileInfo;
 }
 
 export interface GrDropdownList {
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
index 26a6b3f..f313174 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
@@ -158,6 +158,9 @@
             <template is="dom-if" if="[[item.date]]">
               <gr-date-formatter date-str="[[item.date]]"></gr-date-formatter>
             </template>
+            <template is="dom-if" if="[[item.file]]">
+              <gr-file-status-chip file="[[item.file]]"></gr-file-status-chip>
+            </template>
           </div>
           <template is="dom-if" if="[[item.bottomText]]">
             <div class="bottomContent">
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.ts b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.ts
index d64b1c0..ae9bfd7 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.ts
@@ -17,7 +17,6 @@
 import '@polymer/iron-dropdown/iron-dropdown';
 import '../gr-button/gr-button';
 import '../gr-cursor-manager/gr-cursor-manager';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import '../gr-tooltip-content/gr-tooltip-content';
 import '../../../styles/shared-styles';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.ts b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.ts
index 9c9363b..10e8916 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.ts
@@ -24,7 +24,7 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {customElement, property} from '@polymer/decorators';
 import {htmlTemplate} from './gr-editable-content_html';
-import {fireAlert} from '../../../utils/event-util';
+import {fireAlert, fireEvent} from '../../../utils/event-util';
 
 const RESTORED_MESSAGE = 'Content restored from a previous edit.';
 const STORAGE_DEBOUNCE_INTERVAL_MS = 400;
@@ -188,11 +188,6 @@
   _handleCancel(e: Event) {
     e.preventDefault();
     this.editing = false;
-    this.dispatchEvent(
-      new CustomEvent('editable-content-cancel', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'editable-content-cancel');
   }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts
index 9e1a5bf..6f0e84a 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.ts
@@ -89,6 +89,9 @@
   @property({type: Number})
   readonly _verticalOffset = -30;
 
+  @property({type: Boolean})
+  showAsEditPencil = false;
+
   /** @override */
   ready() {
     super.ready();
@@ -133,7 +136,7 @@
     this._inputText = this.value;
     this.editing = true;
 
-    return new Promise(resolve => {
+    return new Promise<void>(resolve => {
       this._awaitOpen(resolve);
     });
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
index 5e36166..7700689 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
@@ -68,13 +68,32 @@
       }
       --paper-input-container-focus-color: var(--link-color);
     }
+    gr-button iron-icon {
+      color: inherit;
+      --iron-icon-height: 18px;
+      --iron-icon-width: 18px;
+    }
+    gr-button.new-change-summary-true {
+      --padding: 1px 4px;
+    }
   </style>
-  <label
-    class$="[[_computeLabelClass(readOnly, value, placeholder)]]"
-    title$="[[_computeLabel(value, placeholder)]]"
-    on-click="_showDropdown"
-    >[[_computeLabel(value, placeholder)]]</label
-  >
+  <template is="dom-if" if="[[!showAsEditPencil]]">
+    <label
+      class$="[[_computeLabelClass(readOnly, value, placeholder)]]"
+      title$="[[_computeLabel(value, placeholder)]]"
+      on-click="_showDropdown"
+      >[[_computeLabel(value, placeholder)]]</label
+    >
+  </template>
+  <template is="dom-if" if="[[showAsEditPencil]]">
+    <gr-button
+      link=""
+      class$="new-change-summary-true [[_computeLabelClass(readOnly, value, placeholder)]]"
+      on-click="_showDropdown"
+      title="[[_computeLabel(value, placeholder)]]"
+      ><iron-icon icon="gr-icons:edit"></iron-icon
+    ></gr-button>
+  </template>
   <iron-dropdown
     id="dropdown"
     vertical-align="auto"
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_test.js b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_test.js
index d8f085e..2bdc570 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_test.js
@@ -45,6 +45,7 @@
   setup(async () => {
     element = basicFixture.instantiate();
     elementNoPlaceholder = noPlaceholderFixture.instantiate();
+    flush();
     label = element.shadowRoot.querySelector('label');
 
     await flush();
@@ -178,6 +179,7 @@
 
     setup(() => {
       element = readOnlyFixture.instantiate();
+      flush();
       label = element.shadowRoot
           .querySelector('label');
     });
diff --git a/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts
new file mode 100644
index 0000000..9298fa3
--- /dev/null
+++ b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip.ts
@@ -0,0 +1,90 @@
+/**
+ * @license
+ * Copyright (C) 2015 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 '../../../styles/shared-styles';
+import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
+import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
+import {htmlTemplate} from './gr-file-status-chip_html';
+import {customElement, property} from '@polymer/decorators';
+import {PolymerElement} from '@polymer/polymer/polymer-element';
+import {SpecialFilePath} from '../../../constants/constants';
+import {NormalizedFileInfo} from '../../change/gr-file-list/gr-file-list';
+import {hasOwnProperty} from '../../../utils/common-util';
+
+const FileStatus = {
+  A: 'Added',
+  C: 'Copied',
+  D: 'Deleted',
+  M: 'Modified',
+  R: 'Renamed',
+  W: 'Rewritten',
+  U: 'Unchanged',
+};
+
+@customElement('gr-file-status-chip')
+export class GrFileStatusChip extends GestureEventListeners(
+  LegacyElementMixin(PolymerElement)
+) {
+  static get template() {
+    return htmlTemplate;
+  }
+
+  @property({type: Object})
+  file?: NormalizedFileInfo;
+
+  /**
+   * Get a descriptive label for use in the status indicator's tooltip and
+   * ARIA label.
+   */
+  _computeFileStatusLabel(status?: keyof typeof FileStatus) {
+    const statusCode = this._computeFileStatus(status);
+    return hasOwnProperty(FileStatus, statusCode)
+      ? FileStatus[statusCode]
+      : 'Status Unknown';
+  }
+
+  _computeClass(baseClass?: string, path?: string) {
+    const classes = [];
+    if (baseClass) {
+      classes.push(baseClass);
+    }
+    if (
+      path === SpecialFilePath.COMMIT_MESSAGE ||
+      path === SpecialFilePath.MERGE_LIST
+    ) {
+      classes.push('invisible');
+    }
+    return classes.join(' ');
+  }
+
+  _computeFileStatus(
+    status?: keyof typeof FileStatus
+  ): keyof typeof FileStatus {
+    return status || 'M';
+  }
+
+  _computeStatusClass(file?: NormalizedFileInfo) {
+    if (!file) return '';
+    const classStr = this._computeClass('status', file.__path);
+    return `${classStr} ${this._computeFileStatus(file.status)}`;
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    'gr-file-status-chip': GrFileStatusChip;
+  }
+}
diff --git a/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip_html.ts b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip_html.ts
new file mode 100644
index 0000000..9e49868
--- /dev/null
+++ b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip_html.ts
@@ -0,0 +1,51 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {html} from '@polymer/polymer/lib/utils/html-tag';
+
+export const htmlTemplate = html`
+  <style include="shared-styles">
+    .status {
+      display: inline-block;
+      border-radius: var(--border-radius);
+      margin-left: var(--spacing-s);
+      padding: 0 var(--spacing-m);
+      color: var(--primary-text-color);
+      font-size: var(--font-size-small);
+      background-color: var(--dark-add-highlight-color);
+    }
+    .status.invisible,
+    .status.M {
+      display: none;
+    }
+    .status.D,
+    .status.R,
+    .status.W {
+      background-color: var(--dark-remove-highlight-color);
+    }
+    .status.U {
+      background-color: var(--comment-background-color);
+    }
+  </style>
+  <span
+    class$="[[_computeStatusClass(file)]]"
+    tabindex="0"
+    title$="[[_computeFileStatusLabel(file.status)]]"
+    aria-label$="[[_computeFileStatusLabel(file.status)]]"
+  >
+    [[_computeFileStatusLabel(file.status)]]
+  </span>
+`;
diff --git a/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip_test.ts b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip_test.ts
new file mode 100644
index 0000000..0abc85f
--- /dev/null
+++ b/polygerrit-ui/app/elements/shared/gr-file-status-chip/gr-file-status-chip_test.ts
@@ -0,0 +1,46 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import '../../../test/common-test-setup-karma';
+import './gr-file-status-chip';
+import {GrFileStatusChip} from './gr-file-status-chip';
+
+const fixture = fixtureFromElement('gr-file-status-chip');
+
+suite('gr-file-status-chip tests', () => {
+  let element: GrFileStatusChip;
+
+  setup(() => {
+    element = fixture.instantiate();
+  });
+
+  test('computed properties', () => {
+    assert.equal(element._computeFileStatus('A'), 'A');
+    assert.equal(element._computeFileStatus(undefined), 'M');
+
+    assert.equal(element._computeClass('clazz', '/foo/bar/baz'), 'clazz');
+    assert.equal(
+      element._computeClass('clazz', '/COMMIT_MSG'),
+      'clazz invisible'
+    );
+  });
+
+  test('_computeFileStatusLabel', () => {
+    assert.equal(element._computeFileStatusLabel('A'), 'Added');
+    assert.equal(element._computeFileStatusLabel('M'), 'Modified');
+  });
+});
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 9764c59..761e670 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
@@ -19,7 +19,6 @@
 import '../../../styles/shared-styles';
 import '../gr-avatar/gr-avatar';
 import '../gr-button/gr-button';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import {hovercardBehaviorMixin} from '../gr-hovercard/gr-hovercard-behavior';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts
index 0cb628c..a493e51 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-context.ts
@@ -18,6 +18,7 @@
 import {GrAnnotation} from '../../diff/gr-diff-highlight/gr-annotation';
 import {GrStyleObject} from '../../plugins/gr-styles-api/gr-styles-api';
 import {GrDiffLine} from '../../diff/gr-diff/gr-diff-line';
+import {appContext} from '../../../services/app-context';
 
 /**
  * Used to create a context for GrAnnotationActionsInterface.
@@ -42,6 +43,8 @@
 
   changeNum: number;
 
+  private readonly reporting = appContext.reportingService;
+
   constructor(
     contentEl: HTMLElement,
     lineNumberEl: HTMLElement,
@@ -56,8 +59,8 @@
     this.path = path;
     this.changeNum = Number(changeNum);
     if (isNaN(this.changeNum)) {
-      console.error(
-        `GrAnnotationActionsContext: Invalid changeNum: ${changeNum}`
+      this.reporting.error(
+        new Error(`GrAnnotationActionsContext: Invalid changeNum: ${changeNum}`)
       );
     }
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
index e069f8b..f160807 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
@@ -24,6 +24,7 @@
 import {Side} from '../../../constants/constants';
 import {PluginApi} from '../../plugins/gr-plugin-types';
 import {ChangeInfo, NumericChangeId} from '../../../types/common';
+import {appContext} from '../../../services/app-context';
 
 type AddLayerFunc = (ctx: GrAnnotationActionsContext) => void;
 
@@ -52,6 +53,8 @@
   // Default impl is a no-op.
   private addLayerFunc: AddLayerFunc = () => {};
 
+  reporting = appContext.reportingService;
+
   constructor(private readonly plugin: PluginApi) {
     // Return this instance when there is an annotatediff event.
     plugin.on('annotatediff', this);
@@ -134,12 +137,14 @@
   ) {
     this.plugin.hook('annotation-toggler').onAttached(element => {
       if (!element.content) {
-        console.error('plugin endpoint without content.');
+        this.reporting.error(new Error('plugin endpoint without content.'));
         return;
       }
       if (!element.content.hidden) {
-        console.error(
-          element.content.id + ' is already enabled. Cannot re-enable.'
+        this.reporting.error(
+          new Error(
+            `${element.content.id} is already enabled. Cannot re-enable.`
+          )
         );
         return;
       }
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api_test.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api_test.js
index 8b3f501..7ae34cf 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api_test.js
@@ -133,12 +133,9 @@
     // Assert that error is shown if we try to enable checkbox again.
     onAttachedFuncCalled = false;
     annotationActions.enableToggleCheckbox('test label2', onAttachedFunc);
-    const errorStub = sinon.stub(
-        console, 'error').callsFake((msg, err) => undefined);
+    const errorStub = sinon.stub(annotationActions.reporting, 'error');
     emulateAttached();
-    assert.isTrue(
-        errorStub.calledWith(
-            'annotation-span is already enabled. Cannot re-enable.'));
+    assert.isTrue(errorStub.called);
     // Assert that onAttachedFunc is not called and the label has not changed.
     assert.isFalse(onAttachedFuncCalled);
     assert.equal(document.getElementById('annotation-label').textContent,
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts
index 1bcf190..ae6e155 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface-element.ts
@@ -36,6 +36,7 @@
 import {EventType, TargetElement} from '../../plugins/gr-plugin-types';
 import {DiffLayer, HighlightJS} from '../../../types/types';
 import {ParsedChangeInfo} from '../gr-rest-api-interface/gr-reviewer-updates-parser';
+import {appContext} from '../../../services/app-context';
 
 const elements: {[key: string]: HTMLElement} = {};
 const eventCallbacks: {[key: string]: EventCallback[]} = {};
@@ -44,6 +45,8 @@
 export class GrJsApiInterface
   extends GestureEventListeners(LegacyElementMixin(PolymerElement))
   implements JsApiService {
+  private readonly reporting = appContext.reportingService;
+
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   handleEvent(type: EventType, detail: any) {
     getPluginLoader()
@@ -99,7 +102,7 @@
       try {
         return callback(change, revision) === false;
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
       return false;
     });
@@ -120,7 +123,7 @@
       try {
         cb(detail.path);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -161,7 +164,7 @@
       try {
         cb(change, revision, info);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -174,7 +177,7 @@
       try {
         cb(detail.revisionActions, detail.change);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -184,7 +187,7 @@
       try {
         cb(change, msg);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -195,7 +198,7 @@
       try {
         cb(detail.node);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -205,7 +208,7 @@
       try {
         cb(detail.change);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -215,7 +218,7 @@
       try {
         cb(detail.hljs);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -225,7 +228,7 @@
       try {
         revertMsg = cb(change, revertMsg, origMsg) as string;
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
     return revertMsg;
@@ -244,7 +247,7 @@
           origMsg
         ) as string;
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
     return revertSubmissionMsg;
@@ -258,7 +261,7 @@
         const layer = annotationApi.getLayer(path, changeNum);
         layers.push(layer);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
     return layers;
@@ -270,7 +273,7 @@
         const annotationApi = (cb as unknown) as GrAnnotationActionsInterface;
         annotationApi.disposeLayer(path);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
   }
@@ -311,7 +314,7 @@
       try {
         labels = cb(change);
       } catch (err) {
-        console.error(err);
+        this.reporting.error(err);
       }
     }
     return labels;
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.ts
index b9a6ff4..a05e7e1 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.ts
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import './gr-js-api-interface-element';
 import './gr-public-js-api';
 import './gr-gerrit';
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js
index b5c4e48..1481c2d 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.js
@@ -24,6 +24,7 @@
 import {getPluginLoader} from './gr-plugin-loader.js';
 import {_testOnly_initGerritPluginApi} from './gr-gerrit.js';
 import {stubBaseUrl} from '../../../test/test-utils.js';
+import sinon from 'sinon/pkg/sinon-esm';
 
 const basicFixture = fixtureFromElement('gr-js-api-interface');
 
@@ -57,7 +58,7 @@
       },
     });
     element = basicFixture.instantiate();
-    errorStub = sinon.stub(console, 'error');
+    errorStub = sinon.stub(element.reporting, 'error');
     pluginApi.install(p => { plugin = p; }, '0.1',
         'http://test.com/plugins/testplugin/static/test.js');
     getPluginLoader().loadPlugins([]);
@@ -404,6 +405,7 @@
 
   suite('popup', () => {
     test('popup(element) is deprecated', () => {
+      sinon.stub(console, 'error');
       plugin.popup(document.createElement('div'));
       assert.isTrue(console.error.calledOnce);
     });
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
index 19430ac..b725d3b 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
@@ -340,6 +340,7 @@
     const urlWithAP = this._urlFor(pluginUrl, window.ASSETS_PATH);
     const urlWithoutAP = this._urlFor(pluginUrl);
     let onerror = undefined;
+    this._getReporting().reportExecution('html-plugin', {pluginUrl});
     if (urlWithAP !== urlWithoutAP) {
       onerror = () => this._loadHtmlPlugin(urlWithoutAP, opts.sync);
     }
@@ -429,7 +430,7 @@
       // and the return type is NodeJS.Timeout object
       let timerId: number;
       this._loadingPromise = Promise.race([
-        new Promise(resolve => (this._loadingResolver = resolve)),
+        new Promise<void>(resolve => (this._loadingResolver = resolve)),
         new Promise(
           (_, reject) =>
             (timerId = window.setTimeout(() => {
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts
index 00b2963..eb63a77 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-rest-api.ts
@@ -120,14 +120,28 @@
     errFn?: ErrorCallback,
     contentType?: string
   ) {
+    // Plugins typically don't want Gerrit to show error dialogs for failed
+    // requests. So we are defining a default errFn here, even if it is not
+    // explicitly set by the caller.
+    // TODO: We are soon getting rid of the `errFn` altogether. There are only
+    // 2 known usages of errFn in plugins: delete-project and verify-status.
+    errFn =
+      errFn ??
+      ((response: Response | null | undefined, error?: Error) => {
+        if (error) throw error;
+        if (response) throw new Error(`${response.status}`);
+        throw new Error('Generic REST API error.');
+      });
     return this.fetch(method, url, payload, errFn, contentType).then(
       response => {
+        // Will typically not happen. The response can only be unset, if the
+        // errFn handles the error and then returns void or undefined or null.
+        // But the errFn above always throws.
         if (!response) {
-          // TODO(TS): Fix method definition
-          // If errFn exists and doesn't throw an exception, the fetch method
-          // returns empty response
-          throw new Error('errFn must throw an exception');
+          throw new Error('plugin rest-api call failed');
         }
+        // Will typically not happen. errFn will have dealt with that and the
+        // caller will get a rejected promise already.
         if (response.status < 200 || response.status >= 300) {
           return response.text().then(text => {
             if (text) {
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 332aa51..70f68ae 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
@@ -21,7 +21,6 @@
 import '../gr-button/gr-button';
 import '../gr-icons/gr-icons';
 import '../gr-label/gr-label';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 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';
diff --git a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts
index dbb8725..fa244f6 100644
--- a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts
+++ b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.ts
@@ -24,6 +24,7 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {customElement, property} from '@polymer/decorators';
 import {htmlTemplate} from './gr-linked-chip_html';
+import {fireEvent} from '../../../utils/event-util';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -64,11 +65,6 @@
 
   _handleRemoveTap(e: Event) {
     e.preventDefault();
-    this.dispatchEvent(
-      new CustomEvent('remove', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'remove');
   }
 }
diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
index 3403e87..97b45ac 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
@@ -25,6 +25,7 @@
 import {encodeURL, getBaseUrl} from '../../../utils/url-util';
 import {page} from '../../../utils/page-wrapper-utils';
 import {property, customElement} from '@polymer/decorators';
+import {fireEvent} from '../../../utils/event-util';
 
 const REQUEST_DEBOUNCE_INTERVAL_MS = 200;
 
@@ -96,12 +97,7 @@
   }
 
   _createNewItem() {
-    this.dispatchEvent(
-      new CustomEvent('create-clicked', {
-        composed: true,
-        bubbles: true,
-      })
-    );
+    fireEvent(this, 'create-clicked');
   }
 
   _computeNavLink(
diff --git a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
index 026cb3a..d29cba7 100644
--- a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
+++ b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.ts
@@ -20,9 +20,10 @@
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-overlay_html';
 import {IronOverlayMixin} from '../../../mixins/iron-overlay-mixin/iron-overlay-mixin';
-import {customElement, property} from '@polymer/decorators';
+import {customElement} from '@polymer/decorators';
 import {IronOverlayBehavior} from '@polymer/iron-overlay-behavior/iron-overlay-behavior';
 import {findActiveElement} from '../../../utils/dom-util';
+import {fireEvent} from '../../../utils/event-util';
 
 const AWAIT_MAX_ITERS = 10;
 const AWAIT_STEP = 5;
@@ -55,7 +56,6 @@
    * @event fullscreen-overlay-opened
    */
 
-  @property({type: Boolean})
   private _fullScreenOpen = false;
 
   private _boundHandleClose: () => void = () => super.close();
@@ -95,15 +95,10 @@
   open() {
     this.returnFocusTo = findActiveElement(document, true) ?? undefined;
     window.addEventListener('popstate', this._boundHandleClose);
-    return new Promise((resolve, reject) => {
+    return new Promise<void>((resolve, reject) => {
       super.open.apply(this);
       if (this._isMobile()) {
-        this.dispatchEvent(
-          new CustomEvent('fullscreen-overlay-opened', {
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireEvent(this, 'fullscreen-overlay-opened');
         this._fullScreenOpen = true;
       }
       this._awaitOpen(resolve, reject);
@@ -118,12 +113,7 @@
   _overlayClosed() {
     window.removeEventListener('popstate', this._boundHandleClose);
     if (this._fullScreenOpen) {
-      this.dispatchEvent(
-        new CustomEvent('fullscreen-overlay-closed', {
-          composed: true,
-          bubbles: true,
-        })
-      );
+      fireEvent(this, 'fullscreen-overlay-closed');
       this._fullScreenOpen = false;
     }
     if (this.returnFocusTo) {
diff --git a/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.ts b/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.ts
index 48c2253..6db1925 100644
--- a/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.ts
+++ b/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.ts
@@ -18,7 +18,6 @@
 import '../../../styles/shared-styles';
 import '../gr-icons/gr-icons';
 import '../gr-labeled-autocomplete/gr-labeled-autocomplete';
-import '../gr-rest-api-interface/gr-rest-api-interface';
 import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
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 edb0113..078e07f 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
@@ -157,7 +157,7 @@
   HttpMethod,
   ReviewerState,
 } from '../../../constants/constants';
-import {firePageError} from '../../../utils/event-util';
+import {firePageError, fireServerError} from '../../../utils/event-util';
 
 const JSON_PREFIX = ")]}'";
 const MAX_PROJECT_RESULTS = 25;
@@ -408,19 +408,7 @@
     }) as Promise<DashboardInfo[] | undefined>;
   }
 
-  saveRepoConfig(repo: RepoName, config: ConfigInput): Promise<Response>;
-
-  saveRepoConfig(
-    repo: RepoName,
-    config: ConfigInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  saveRepoConfig(
-    repo: RepoName,
-    config: ConfigInput,
-    errFn?: ErrorCallback
-  ): Promise<Response | undefined> {
+  saveRepoConfig(repo: RepoName, config: ConfigInput): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const url = `/projects/${encodeURIComponent(repo)}/config`;
@@ -429,23 +417,11 @@
       method: HttpMethod.PUT,
       url,
       body: config,
-      errFn,
       anonymizedUrl: '/projects/*/config',
     });
   }
 
-  runRepoGC(repo: RepoName): Promise<Response>;
-
-  runRepoGC(
-    repo: RepoName,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  runRepoGC(repo: RepoName, errFn?: ErrorCallback) {
-    if (!repo) {
-      // TODO(TS): fix return value
-      return '';
-    }
+  runRepoGC(repo: RepoName): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const encodeName = encodeURIComponent(repo);
@@ -453,23 +429,11 @@
       method: HttpMethod.POST,
       url: `/projects/${encodeName}/gc`,
       body: '',
-      errFn,
       anonymizedUrl: '/projects/*/gc',
     });
   }
 
-  createRepo(config: ProjectInput & {name: RepoName}): Promise<Response>;
-
-  createRepo(
-    config: ProjectInput & {name: RepoName},
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  createRepo(config: ProjectInput, errFn?: ErrorCallback) {
-    if (!config.name) {
-      // TODO(TS): Fix return value
-      return '';
-    }
+  createRepo(config: ProjectInput & {name: RepoName}): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const encodeName = encodeURIComponent(config.name);
@@ -477,29 +441,16 @@
       method: HttpMethod.PUT,
       url: `/projects/${encodeName}`,
       body: config,
-      errFn,
       anonymizedUrl: '/projects/*',
     });
   }
 
-  createGroup(config: GroupInput & {name: string}): Promise<Response>;
-
-  createGroup(
-    config: GroupInput & {name: string},
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  createGroup(config: GroupInput, errFn?: ErrorCallback) {
-    if (!config.name) {
-      // TODO(TS): Fix return value
-      return '';
-    }
+  createGroup(config: GroupInput & {name: string}): Promise<Response> {
     const encodeName = encodeURIComponent(config.name);
     return this._restApiHelper.send({
       method: HttpMethod.PUT,
       url: `/groups/${encodeName}`,
       body: config,
-      errFn,
       anonymizedUrl: '/groups/*',
     });
   }
@@ -515,19 +466,7 @@
     }) as Promise<GroupInfo | undefined>;
   }
 
-  deleteRepoBranches(repo: RepoName, ref: GitRef): Promise<Response>;
-
-  deleteRepoBranches(
-    repo: RepoName,
-    ref: GitRef,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  deleteRepoBranches(repo: RepoName, ref: GitRef, errFn?: ErrorCallback) {
-    if (!repo || !ref) {
-      // TODO(TS): fix return value
-      return '';
-    }
+  deleteRepoBranches(repo: RepoName, ref: GitRef): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const encodeName = encodeURIComponent(repo);
@@ -536,24 +475,11 @@
       method: HttpMethod.DELETE,
       url: `/projects/${encodeName}/branches/${encodeRef}`,
       body: '',
-      errFn,
       anonymizedUrl: '/projects/*/branches/*',
     });
   }
 
-  deleteRepoTags(repo: RepoName, ref: GitRef): Promise<Response>;
-
-  deleteRepoTags(
-    repo: RepoName,
-    ref: GitRef,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  deleteRepoTags(repo: RepoName, ref: GitRef, errFn?: ErrorCallback) {
-    if (!repo || !ref) {
-      // TODO(TS): fix return type
-      return '';
-    }
+  deleteRepoTags(repo: RepoName, ref: GitRef): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const encodeName = encodeURIComponent(repo);
@@ -562,7 +488,6 @@
       method: HttpMethod.DELETE,
       url: `/projects/${encodeName}/tags/${encodeRef}`,
       body: '',
-      errFn,
       anonymizedUrl: '/projects/*/tags/*',
     });
   }
@@ -571,25 +496,7 @@
     name: RepoName,
     branch: BranchName,
     revision: BranchInput
-  ): Promise<Response>;
-
-  createRepoBranch(
-    name: RepoName,
-    branch: BranchName,
-    revision: BranchInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  createRepoBranch(
-    name: RepoName,
-    branch: BranchName,
-    revision: BranchInput,
-    errFn?: ErrorCallback
-  ) {
-    if (!name || !branch || !revision) {
-      // TODO(TS) fix return type
-      return '';
-    }
+  ): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const encodeName = encodeURIComponent(name);
@@ -598,7 +505,6 @@
       method: HttpMethod.PUT,
       url: `/projects/${encodeName}/branches/${encodeBranch}`,
       body: revision,
-      errFn,
       anonymizedUrl: '/projects/*/branches/*',
     });
   }
@@ -607,25 +513,7 @@
     name: RepoName,
     tag: string,
     revision: TagInput
-  ): Promise<Response>;
-
-  createRepoTag(
-    name: RepoName,
-    tag: string,
-    revision: TagInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  createRepoTag(
-    name: RepoName,
-    tag: string,
-    revision: TagInput,
-    errFn?: ErrorCallback
-  ) {
-    if (!name || !tag || !revision) {
-      // TODO(TS): Fix return value
-      return '';
-    }
+  ): Promise<Response> {
     // TODO(kaspern): Rename rest api from /projects/ to /repos/ once backend
     // supports it.
     const encodeName = encodeURIComponent(name);
@@ -634,7 +522,6 @@
       method: HttpMethod.PUT,
       url: `/projects/${encodeName}/tags/${encodeTag}`,
       body: revision,
-      errFn,
       anonymizedUrl: '/projects/*/tags/*',
     });
   }
@@ -650,16 +537,12 @@
     );
   }
 
-  getGroupMembers(
-    groupName: GroupId | GroupName,
-    errFn?: ErrorCallback
-  ): Promise<AccountInfo[] | undefined> {
+  getGroupMembers(groupName: GroupId | GroupName): Promise<AccountInfo[]> {
     const encodeName = encodeURIComponent(groupName);
-    return this._restApiHelper.fetchJSON({
+    return (this._restApiHelper.fetchJSON({
       url: `/groups/${encodeName}/members/`,
-      errFn,
       anonymizedUrl: '/groups/*/members',
-    }) as Promise<AccountInfo[] | undefined>;
+    }) as unknown) as Promise<AccountInfo[]>;
   }
 
   getIncludedGroup(
@@ -865,14 +748,7 @@
     });
   }
 
-  savePreferences(prefs: PreferencesInput): Promise<Response>;
-
-  savePreferences(
-    prefs: PreferencesInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  savePreferences(prefs: PreferencesInput, errFn?: ErrorCallback) {
+  savePreferences(prefs: PreferencesInput): Promise<Response> {
     // Note (Issue 5142): normalize the download scheme with lower case before
     // saving.
     if (prefs.download_scheme) {
@@ -883,45 +759,28 @@
       method: HttpMethod.PUT,
       url: '/accounts/self/preferences',
       body: prefs,
-      errFn,
       reportUrlAsIs: true,
     });
   }
 
-  saveDiffPreferences(prefs: DiffPreferenceInput): Promise<Response>;
-
-  saveDiffPreferences(
-    prefs: DiffPreferenceInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  saveDiffPreferences(prefs: DiffPreferenceInput, errFn?: ErrorCallback) {
+  saveDiffPreferences(prefs: DiffPreferenceInput): Promise<Response> {
     // Invalidate the cache.
     this._cache.delete('/accounts/self/preferences.diff');
     return this._restApiHelper.send({
       method: HttpMethod.PUT,
       url: '/accounts/self/preferences.diff',
       body: prefs,
-      errFn,
       reportUrlAsIs: true,
     });
   }
 
-  saveEditPreferences(prefs: EditPreferencesInfo): Promise<Response>;
-
-  saveEditPreferences(
-    prefs: EditPreferencesInfo,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  saveEditPreferences(prefs: EditPreferencesInfo, errFn?: ErrorCallback) {
+  saveEditPreferences(prefs: EditPreferencesInfo): Promise<Response> {
     // Invalidate the cache.
     this._cache.delete('/accounts/self/preferences.edit');
     return this._restApiHelper.send({
       method: HttpMethod.PUT,
       url: '/accounts/self/preferences.edit',
       body: prefs,
-      errFn,
       reportUrlAsIs: true,
     });
   }
@@ -981,48 +840,28 @@
     }) as Promise<EmailInfo[] | undefined>;
   }
 
-  addAccountEmail(email: string): Promise<Response>;
-
-  addAccountEmail(
-    email: string,
-    errFn?: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  addAccountEmail(email: string, errFn?: ErrorCallback) {
+  addAccountEmail(email: string): Promise<Response> {
     return this._restApiHelper.send({
       method: HttpMethod.PUT,
       url: '/accounts/self/emails/' + encodeURIComponent(email),
-      errFn,
       anonymizedUrl: '/account/self/emails/*',
     });
   }
 
-  deleteAccountEmail(email: string): Promise<Response>;
-
-  deleteAccountEmail(
-    email: string,
-    errFn?: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  deleteAccountEmail(email: string, errFn?: ErrorCallback) {
+  deleteAccountEmail(email: string): Promise<Response> {
     return this._restApiHelper.send({
       method: HttpMethod.DELETE,
       url: '/accounts/self/emails/' + encodeURIComponent(email),
-      errFn,
       anonymizedUrl: '/accounts/self/email/*',
     });
   }
 
-  setPreferredAccountEmail(
-    email: string,
-    errFn?: ErrorCallback
-  ): Promise<void> {
+  setPreferredAccountEmail(email: string): Promise<void> {
     // TODO(TS): add correct error handling
     const encodedEmail = encodeURIComponent(email);
     const req = {
       method: HttpMethod.PUT,
       url: `/accounts/self/emails/${encodedEmail}/preferred`,
-      errFn,
       anonymizedUrl: '/accounts/self/emails/*/preferred',
     };
     return this._restApiHelper.send(req).then(() => {
@@ -1052,13 +891,12 @@
     }
   }
 
-  setAccountName(name: string, errFn?: ErrorCallback): Promise<void> {
+  setAccountName(name: string): Promise<void> {
     // TODO(TS): add correct error handling
     const req: SendJSONRequest = {
       method: HttpMethod.PUT,
       url: '/accounts/self/name',
       body: {name},
-      errFn,
       parseResponse: true,
       reportUrlAsIs: true,
     };
@@ -1069,13 +907,12 @@
       );
   }
 
-  setAccountUsername(username: string, errFn?: ErrorCallback): Promise<void> {
+  setAccountUsername(username: string): Promise<void> {
     // TODO(TS): add correct error handling
     const req: SendJSONRequest = {
       method: HttpMethod.PUT,
       url: '/accounts/self/username',
       body: {username},
-      errFn,
       parseResponse: true,
       reportUrlAsIs: true,
     };
@@ -1086,16 +923,12 @@
       );
   }
 
-  setAccountDisplayName(
-    displayName: string,
-    errFn?: ErrorCallback
-  ): Promise<void> {
+  setAccountDisplayName(displayName: string): Promise<void> {
     // TODO(TS): add correct error handling
     const req: SendJSONRequest = {
       method: HttpMethod.PUT,
       url: '/accounts/self/displayname',
       body: {display_name: displayName},
-      errFn,
       parseResponse: true,
       reportUrlAsIs: true,
     };
@@ -1106,13 +939,12 @@
     );
   }
 
-  setAccountStatus(status: string, errFn?: ErrorCallback): Promise<void> {
+  setAccountStatus(status: string): Promise<void> {
     // TODO(TS): add correct error handling
     const req: SendJSONRequest = {
       method: HttpMethod.PUT,
       url: '/accounts/self/status',
       body: {status},
-      errFn,
       parseResponse: true,
       reportUrlAsIs: true,
     };
@@ -1237,34 +1069,22 @@
   }
 
   saveWatchedProjects(
-    projects: ProjectWatchInfo[],
-    errFn?: ErrorCallback
+    projects: ProjectWatchInfo[]
   ): Promise<ProjectWatchInfo[]> {
     return (this._restApiHelper.send({
       method: HttpMethod.POST,
       url: '/accounts/self/watched.projects',
       body: projects,
-      errFn,
       parseResponse: true,
       reportUrlAsIs: true,
     }) as unknown) as Promise<ProjectWatchInfo[]>;
   }
 
-  deleteWatchedProjects(
-    projects: ProjectWatchInfo[]
-  ): Promise<Response | undefined>;
-
-  deleteWatchedProjects(
-    projects: ProjectWatchInfo[],
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  deleteWatchedProjects(projects: ProjectWatchInfo[], errFn?: ErrorCallback) {
+  deleteWatchedProjects(projects: ProjectWatchInfo[]): Promise<Response> {
     return this._restApiHelper.send({
       method: HttpMethod.POST,
       url: '/accounts/self/watched.projects:delete',
       body: projects,
-      errFn,
       reportUrlAsIs: true,
     });
   }
@@ -1443,11 +1263,7 @@
     return listChangesOptionsToHex(...options);
   }
 
-  getDiffChangeDetail(
-    changeNum: NumericChangeId,
-    errFn?: ErrorCallback,
-    cancelCondition?: CancelConditionCallback
-  ) {
+  getDiffChangeDetail(changeNum: NumericChangeId) {
     let optionsHex = '';
     if (window.DEFAULT_DETAIL_HEXES?.diffPage) {
       optionsHex = window.DEFAULT_DETAIL_HEXES.diffPage;
@@ -1458,7 +1274,7 @@
         ListChangesOption.SKIP_DIFFSTAT
       );
     }
-    return this._getChangeDetail(changeNum, optionsHex, errFn, cancelCondition);
+    return this._getChangeDetail(changeNum, optionsHex);
   }
 
   /**
@@ -1494,13 +1310,7 @@
             if (errFn) {
               errFn.call(null, response);
             } else {
-              document.dispatchEvent(
-                new CustomEvent('server-error', {
-                  detail: {request: req, response},
-                  composed: true,
-                  bubbles: true,
-                })
-              );
+              fireServerError(response, req);
             }
             return undefined;
           }
@@ -1614,37 +1424,22 @@
     >;
   }
 
-  getChangeSuggestedReviewers(
-    changeNum: NumericChangeId,
-    inputVal: string,
-    errFn?: ErrorCallback
-  ) {
+  getChangeSuggestedReviewers(changeNum: NumericChangeId, inputVal: string) {
     return this._getChangeSuggestedGroup(
       ReviewerState.REVIEWER,
       changeNum,
-      inputVal,
-      errFn
+      inputVal
     );
   }
 
-  getChangeSuggestedCCs(
-    changeNum: NumericChangeId,
-    inputVal: string,
-    errFn?: ErrorCallback
-  ) {
-    return this._getChangeSuggestedGroup(
-      ReviewerState.CC,
-      changeNum,
-      inputVal,
-      errFn
-    );
+  getChangeSuggestedCCs(changeNum: NumericChangeId, inputVal: string) {
+    return this._getChangeSuggestedGroup(ReviewerState.CC, changeNum, inputVal);
   }
 
   _getChangeSuggestedGroup(
     reviewerState: ReviewerState,
     changeNum: NumericChangeId,
-    inputVal: string,
-    errFn?: ErrorCallback
+    inputVal: string
   ): Promise<SuggestedReviewerInfo[] | undefined> {
     // More suggestions may obscure content underneath in the reply dialog,
     // see issue 10793.
@@ -1658,7 +1453,6 @@
     return this._getChangeURLAndFetch({
       changeNum,
       endpoint: '/suggest_reviewers',
-      errFn,
       params,
       reportEndpointAsIs: true,
     }) as Promise<SuggestedReviewerInfo[] | undefined>;
@@ -1879,8 +1673,7 @@
 
   getSuggestedGroups(
     inputVal: string,
-    n?: number,
-    errFn?: ErrorCallback
+    n?: number
   ): Promise<GroupNameToGroupInfoMap | undefined> {
     const params: QueryGroupsParams = {s: inputVal};
     if (n) {
@@ -1888,7 +1681,6 @@
     }
     return this._restApiHelper.fetchJSON({
       url: '/groups/',
-      errFn,
       params,
       reportUrlAsIs: true,
     }) as Promise<GroupNameToGroupInfoMap | undefined>;
@@ -1896,8 +1688,7 @@
 
   getSuggestedProjects(
     inputVal: string,
-    n?: number,
-    errFn?: ErrorCallback
+    n?: number
   ): Promise<NameToProjectInfoMap | undefined> {
     const params = {
       m: inputVal,
@@ -1909,7 +1700,6 @@
     }
     return this._restApiHelper.fetchJSON({
       url: '/projects/',
-      errFn,
       params,
       reportUrlAsIs: true,
     });
@@ -1917,8 +1707,7 @@
 
   getSuggestedAccounts(
     inputVal: string,
-    n?: number,
-    errFn?: ErrorCallback
+    n?: number
   ): Promise<AccountInfo[] | undefined> {
     if (!inputVal) {
       return Promise.resolve([]);
@@ -1929,7 +1718,6 @@
     }
     return this._restApiHelper.fetchJSON({
       url: '/accounts/',
-      errFn,
       params,
       anonymizedUrl: '/accounts/?n=*',
     }) as Promise<AccountInfo[] | undefined>;
@@ -2090,29 +1878,12 @@
     patchNum: PatchSetNum,
     path: string,
     reviewed: boolean
-  ): Promise<Response>;
-
-  saveFileReviewed(
-    changeNum: NumericChangeId,
-    patchNum: PatchSetNum,
-    path: string,
-    reviewed: boolean,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  saveFileReviewed(
-    changeNum: NumericChangeId,
-    patchNum: PatchSetNum,
-    path: string,
-    reviewed: boolean,
-    errFn?: ErrorCallback
-  ) {
+  ): Promise<Response> {
     return this._getChangeURLAndSend({
       changeNum,
       method: reviewed ? HttpMethod.PUT : HttpMethod.DELETE,
       patchNum,
       endpoint: `/files/${encodeURIComponent(path)}/reviewed`,
-      errFn,
       anonymizedEndpoint: '/files/*/reviewed',
     });
   }
@@ -2207,14 +1978,8 @@
     // 404s indicate the file does not exist yet in the revision, so suppress
     // them.
     const suppress404s: ErrorCallback = res => {
-      if (res?.status !== 404) {
-        document.dispatchEvent(
-          new CustomEvent('server-error', {
-            detail: {res},
-            composed: true,
-            bubbles: true,
-          })
-        );
+      if (res && res?.status !== 404) {
+        fireServerError(res);
       }
       return res;
     };
@@ -3238,10 +3003,9 @@
     }) as Promise<CapabilityInfoMap | undefined>;
   }
 
-  getTopMenus(errFn?: ErrorCallback): Promise<TopMenuEntryInfo[] | undefined> {
+  getTopMenus(): Promise<TopMenuEntryInfo[] | undefined> {
     return this._fetchSharedCacheURL({
       url: '/config/server/top-menus',
-      errFn,
       reportUrlAsIs: true,
     }) as Promise<TopMenuEntryInfo[] | undefined>;
   }
@@ -3295,21 +3059,6 @@
     });
   }
 
-  startReview(
-    changeNum: NumericChangeId,
-    body?: RequestPayload,
-    errFn?: ErrorCallback
-  ) {
-    return this._getChangeURLAndSend({
-      changeNum,
-      method: HttpMethod.POST,
-      endpoint: '/ready',
-      body,
-      errFn,
-      reportUrlAsIs: true,
-    });
-  }
-
   deleteComment(
     changeNum: NumericChangeId,
     patchNum: PatchSetNum,
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 bd2818c..717fe54 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
@@ -649,19 +649,6 @@
         {message: 'revising...'});
   });
 
-  test('startReview', () => {
-    const sendStub = sinon.stub(element, '_getChangeURLAndSend')
-        .returns(Promise.resolve({}));
-    element.startReview('42', {message: 'Please review.'});
-    assert.isTrue(sendStub.calledOnce);
-    assert.equal(sendStub.lastCall.args[0].changeNum, '42');
-    assert.equal(sendStub.lastCall.args[0].method, 'POST');
-    assert.isNotOk(sendStub.lastCall.args[0].patchNum);
-    assert.equal(sendStub.lastCall.args[0].endpoint, '/ready');
-    assert.deepEqual(sendStub.lastCall.args[0].body,
-        {message: 'Please review.'});
-  });
-
   test('deleteComment', () => {
     const sendStub = sinon.stub(element, '_getChangeURLAndSend')
         .returns(Promise.resolve('some response'));
@@ -1294,7 +1281,7 @@
         })
         .then(() => {
           assert.isTrue(spy.called);
-          assert.notEqual(spy.lastCall.args[0].detail.res.status, 404);
+          assert.notEqual(spy.lastCall.args[0].detail.response.status, 404);
         });
   });
 
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts
index fadd9f3..43a6af4 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-apis/gr-rest-api-helper.ts
@@ -32,6 +32,8 @@
 } from '../../../../types/common';
 import {HttpMethod} from '../../../../constants/constants';
 import {RpcLogEventDetail} from '../../../../types/events';
+import {fireNetworkError, fireServerError} from '../../../../utils/event-util';
+import {FetchRequest} from '../../../../types/types';
 
 const JSON_PREFIX = ")]}'";
 
@@ -188,12 +190,6 @@
 
 export type SendRequest = SendRawRequest | SendJSONRequest;
 
-export interface FetchRequest {
-  url: string;
-  fetchOptions?: AuthRequestInit;
-  anonymizedUrl?: string;
-}
-
 export interface FetchJSONRequest extends FetchRequest {
   reportUrlAsIs?: boolean;
   params?: FetchParams;
@@ -315,13 +311,7 @@
         if (req.errFn) {
           req.errFn.call(undefined, null, err);
         } else {
-          document.dispatchEvent(
-            new CustomEvent('network-error', {
-              detail: {error: err},
-              composed: true,
-              bubbles: true,
-            })
-          );
+          fireNetworkError(err);
         }
         throw err;
       });
@@ -350,13 +340,7 @@
           req.errFn.call(null, response);
           return;
         }
-        document.dispatchEvent(
-          new CustomEvent('server-error', {
-            detail: {request: req, response},
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireServerError(response, req);
         return;
       }
       return this.getResponseObject(response);
@@ -509,35 +493,23 @@
       anonymizedUrl: req.reportUrlAsIs ? url : req.anonymizedUrl,
     };
     const xhr = this.fetch(fetchReq)
-      .then(response => {
-        if (!response.ok) {
-          if (req.errFn) {
-            req.errFn.call(undefined, response);
-            return;
-          }
-          document.dispatchEvent(
-            new CustomEvent('server-error', {
-              detail: {request: fetchReq, response},
-              composed: true,
-              bubbles: true,
-            })
-          );
-        }
-        return response;
-      })
       .catch(err => {
-        document.dispatchEvent(
-          new CustomEvent('network-error', {
-            detail: {error: err},
-            composed: true,
-            bubbles: true,
-          })
-        );
+        fireNetworkError(err);
         if (req.errFn) {
           return req.errFn.call(undefined, null, err);
         } else {
           throw err;
         }
+      })
+      .then(response => {
+        if (response && !response.ok) {
+          if (req.errFn) {
+            req.errFn.call(undefined, response);
+            return;
+          }
+          fireServerError(response, fetchReq);
+        }
+        return response;
       });
 
     if (req.parseResponse) {
diff --git a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts b/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts
index abbcbc8..28b7a50a 100644
--- a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts
+++ b/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin.ts
@@ -48,14 +48,6 @@
         'Size',
       ];
 
-      /**
-       * Returns the complement to the given column array
-       *
-       */
-      getComplementColumns(columns: string[]) {
-        return this.columnNames.filter(column => !columns.includes(column));
-      }
-
       isColumnHidden(columnToCheck?: string, columnsToDisplay?: string[]) {
         if (!columnsToDisplay || !columnToCheck) {
           return false;
@@ -103,7 +95,7 @@
        * @return If the column was renamed, returns a new array
        * with the corrected name. Otherwise, it returns the original param.
        */
-      getVisibleColumns(columns: string[]) {
+      renameProjectToRepoColumn(columns: string[]) {
         const projectIndex = columns.indexOf('Project');
         if (projectIndex === -1) {
           return columns;
@@ -120,7 +112,6 @@
 
 export interface ChangeTableMixinInterface {
   readonly columnNames: string[];
-  getComplementColumns(columns: string[]): string[];
   isColumnHidden(columnToCheck?: string, columnsToDisplay?: string[]): boolean;
   isColumnEnabled(
     column: string,
@@ -132,5 +123,5 @@
     config: ServerInfo,
     experiments: string[]
   ): string[];
-  getVisibleColumns(columns: string[]): string[];
+  renameProjectToRepoColumn(columns: string[]): string[];
 }
diff --git a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js b/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js
index daf10ce..0d6b4ad 100644
--- a/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js
+++ b/polygerrit-ui/app/mixins/gr-change-table-mixin/gr-change-table-mixin_test.js
@@ -37,35 +37,6 @@
     element = basicFixture.instantiate();
   });
 
-  test('getComplementColumns', () => {
-    let columns = [
-      'Subject',
-      'Status',
-      'Owner',
-      'Assignee',
-      'Reviewers',
-      'Comments',
-      'Repo',
-      'Branch',
-      'Updated',
-      'Size',
-    ];
-    assert.deepEqual(element.getComplementColumns(columns), []);
-
-    columns = [
-      'Subject',
-      'Status',
-      'Assignee',
-      'Reviewers',
-      'Comments',
-      'Repo',
-      'Branch',
-      'Size',
-    ];
-    assert.deepEqual(element.getComplementColumns(columns),
-        ['Owner', 'Updated']);
-  });
-
   test('isColumnHidden', () => {
     const columnToCheck = 'Repo';
     let columnsToDisplay = [
@@ -92,15 +63,16 @@
     assert.isTrue(element.isColumnHidden(columnToCheck, columnsToDisplay));
   });
 
-  test('getVisibleColumns maps Project to Repo', () => {
+  test('renameProjectToRepoColumn maps Project to Repo', () => {
     const columns = [
       'Subject',
       'Status',
       'Owner',
     ];
-    assert.deepEqual(element.getVisibleColumns(columns), columns.slice(0));
+    assert.deepEqual(element.renameProjectToRepoColumn(columns),
+        columns.slice(0));
     assert.deepEqual(
-        element.getVisibleColumns(columns.concat(['Project'])),
+        element.renameProjectToRepoColumn(columns.concat(['Project'])),
         columns.slice(0).concat(['Repo']));
   });
 });
diff --git a/polygerrit-ui/app/rollup.config.js b/polygerrit-ui/app/rollup.config.js
index c8e9baa..d93b5ea 100644
--- a/polygerrit-ui/app/rollup.config.js
+++ b/polygerrit-ui/app/rollup.config.js
@@ -69,7 +69,13 @@
   output: {
     format: 'iife',
     compact: true,
-    plugins: [terser()]
+    plugins: [
+      terser({
+        output: {
+          comments: false
+        }
+      })
+    ]
   },
   //Context must be set to window to correctly processing global variables
   context: 'window',
diff --git a/polygerrit-ui/app/services/app-context-init.ts b/polygerrit-ui/app/services/app-context-init.ts
index cb389bd4..13a9c76 100644
--- a/polygerrit-ui/app/services/app-context-init.ts
+++ b/polygerrit-ui/app/services/app-context-init.ts
@@ -20,6 +20,8 @@
 import {EventEmitter} from './gr-event-interface/gr-event-interface_impl';
 import {Auth} from './gr-auth/gr-auth_impl';
 import {GrRestApiInterface} from '../elements/shared/gr-rest-api-interface/gr-rest-api-interface';
+import {ChangeService} from './change/change-service';
+import {ChecksService} from './checks/checks-service';
 
 type ServiceName = keyof AppContext;
 type ServiceCreator<T> = () => T;
@@ -67,5 +69,7 @@
     eventEmitter: () => new EventEmitter(),
     authService: () => new Auth(appContext.eventEmitter),
     restApiService: () => new GrRestApiInterface(appContext.authService),
+    changeService: () => new ChangeService(appContext.restApiService),
+    checksService: () => new ChecksService(),
   });
 }
diff --git a/polygerrit-ui/app/services/app-context.ts b/polygerrit-ui/app/services/app-context.ts
index 720e489..bd14506 100644
--- a/polygerrit-ui/app/services/app-context.ts
+++ b/polygerrit-ui/app/services/app-context.ts
@@ -19,6 +19,8 @@
 import {ReportingService} from './gr-reporting/gr-reporting';
 import {AuthService} from './gr-auth/gr-auth';
 import {RestApiService} from './services/gr-rest-api/gr-rest-api';
+import {ChangeService} from './change/change-service';
+import {ChecksService} from './checks/checks-service';
 
 export interface AppContext {
   flagsService: FlagsService;
@@ -26,6 +28,8 @@
   eventEmitter: EventEmitterService;
   authService: AuthService;
   restApiService: RestApiService;
+  changeService: ChangeService;
+  checksService: ChecksService;
 }
 
 /**
diff --git a/polygerrit-ui/app/services/change/change-model.ts b/polygerrit-ui/app/services/change/change-model.ts
new file mode 100644
index 0000000..d02535c
--- /dev/null
+++ b/polygerrit-ui/app/services/change/change-model.ts
@@ -0,0 +1,106 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {PatchSetNum} from '../../types/common';
+import {BehaviorSubject, combineLatest, Observable} from 'rxjs';
+import {
+  map,
+  filter,
+  withLatestFrom,
+  distinctUntilChanged,
+} from 'rxjs/operators';
+import {routerPatchNum$, routerState$} from '../router/router-model';
+import {
+  computeAllPatchSets,
+  computeLatestPatchNum,
+} from '../../utils/patch-set-util';
+import {ParsedChangeInfo} from '../../elements/shared/gr-rest-api-interface/gr-reviewer-updates-parser';
+
+interface ChangeState {
+  change?: ParsedChangeInfo;
+}
+
+// TODO: Figure out how to best enforce immutability of all states. Use Immer?
+// Use DeepReadOnly?
+const initialState: ChangeState = {};
+
+const privateState$ = new BehaviorSubject(initialState);
+
+// Re-exporting as Observable so that you can only subscribe, but not emit.
+export const changeState$: Observable<ChangeState> = privateState$;
+
+// Must only be used by the change service or whatever is in control of this
+// model.
+export function updateState(change?: ParsedChangeInfo) {
+  privateState$.next({
+    ...privateState$.getValue(),
+    change,
+  });
+}
+
+/**
+ * If you depend on both, router and change state, then you want to filter out
+ * inconsistent state, e.g. router changeNum already updated, change not yet
+ * reset to undefined.
+ */
+export const changeAndRouterConsistent$ = combineLatest([
+  routerState$,
+  changeState$,
+]).pipe(
+  filter(([routerState, changeState]) => {
+    const changeNum = changeState.change?._number;
+    const routerChangeNum = routerState.changeNum;
+    return changeNum === undefined || changeNum === routerChangeNum;
+  }),
+  distinctUntilChanged()
+);
+
+export const change$ = changeState$.pipe(
+  map(changeState => changeState.change),
+  distinctUntilChanged()
+);
+
+export const changeNum$ = change$.pipe(
+  map(change => change?._number),
+  distinctUntilChanged()
+);
+
+export const latestPatchNum$ = change$.pipe(
+  map(change => computeLatestPatchNum(computeAllPatchSets(change))),
+  distinctUntilChanged()
+);
+
+/**
+ * Emits the current patchset number. If the route does not define the current
+ * patchset num, then this selector waits for the change to be defined and
+ * returns the number of the latest patchset.
+ *
+ * Note that this selector can emit a patchNum without the change being
+ * available!
+ *
+ * TODO: It would be good to assert/enforce somehow that currentPatchNum$ cannot
+ * emit 'PARENT'.
+ */
+export const currentPatchNum$: Observable<
+  PatchSetNum | undefined
+> = changeAndRouterConsistent$.pipe(
+  withLatestFrom(routerPatchNum$, latestPatchNum$),
+  map(([_, routerPatchNum, latestPatchNum]) => {
+    return routerPatchNum || latestPatchNum;
+  }),
+  distinctUntilChanged()
+);
diff --git a/polygerrit-ui/app/services/change/change-service.ts b/polygerrit-ui/app/services/change/change-service.ts
new file mode 100644
index 0000000..a510855
--- /dev/null
+++ b/polygerrit-ui/app/services/change/change-service.ts
@@ -0,0 +1,41 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {routerChangeNum$} from '../router/router-model';
+import {updateState} from './change-model';
+import {RestApiService} from '../services/gr-rest-api/gr-rest-api';
+import {switchMap, tap} from 'rxjs/operators';
+import {of, from} from 'rxjs';
+
+export class ChangeService {
+  private routerChangeNumEffect = routerChangeNum$.pipe(
+    switchMap(changeNum => {
+      if (!changeNum) return of(undefined);
+      return from(this.restApiService.getChangeDetail(changeNum));
+    }),
+    tap(change => {
+      updateState(change ?? undefined);
+    })
+  );
+
+  constructor(private readonly restApiService: RestApiService) {
+    this.routerChangeNumEffect.subscribe();
+  }
+
+  // TODO: Remove.
+  dontDoAnything() {}
+}
diff --git a/polygerrit-ui/app/services/checks/checks-model.ts b/polygerrit-ui/app/services/checks/checks-model.ts
new file mode 100644
index 0000000..f7ee179
--- /dev/null
+++ b/polygerrit-ui/app/services/checks/checks-model.ts
@@ -0,0 +1,95 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {BehaviorSubject, Observable} from 'rxjs';
+import {
+  CheckResult,
+  CheckRun,
+  ChecksApiConfig,
+} from '../../elements/plugins/gr-checks-api/gr-checks-api-types';
+import {map} from 'rxjs/operators';
+
+interface ChecksProviderState {
+  pluginName: string;
+  config?: ChecksApiConfig;
+  runs: CheckRun[];
+}
+
+interface ChecksState {
+  [name: string]: ChecksProviderState;
+}
+
+const initialState: ChecksState = {};
+
+const privateState$ = new BehaviorSubject(initialState);
+
+// Re-exporting as Observable so that you can only subscribe, but not emit.
+export const checksState$: Observable<ChecksState> = privateState$;
+
+export const allRuns$ = checksState$.pipe(
+  map(state => {
+    return Object.values(state).reduce(
+      (allRuns: CheckRun[], providerState: ChecksProviderState) => [
+        ...allRuns,
+        ...providerState.runs,
+      ],
+      []
+    );
+  })
+);
+
+export const allResults$ = checksState$.pipe(
+  map(state => {
+    return Object.values(state)
+      .reduce(
+        (allResults: CheckResult[], providerState: ChecksProviderState) => [
+          ...allResults,
+          ...providerState.runs.reduce(
+            (results: CheckResult[], run: CheckRun) =>
+              results.concat(run.results),
+            []
+          ),
+        ],
+        []
+      )
+      .filter(r => r !== undefined);
+  })
+);
+
+// Must only be used by the checks service or whatever is in control of this
+// model.
+export function updateStateSetProvider(
+  pluginName: string,
+  config?: ChecksApiConfig
+) {
+  const nextState = {...privateState$.getValue()};
+  nextState[pluginName] = {
+    pluginName,
+    config,
+    runs: [],
+  };
+  privateState$.next(nextState);
+}
+
+export function updateStateSetResults(pluginName: string, runs: CheckRun[]) {
+  const nextState = {...privateState$.getValue()};
+  nextState[pluginName] = {
+    ...nextState[pluginName],
+    runs,
+  };
+  privateState$.next(nextState);
+}
diff --git a/polygerrit-ui/app/services/checks/checks-service.ts b/polygerrit-ui/app/services/checks/checks-service.ts
new file mode 100644
index 0000000..7447798
--- /dev/null
+++ b/polygerrit-ui/app/services/checks/checks-service.ts
@@ -0,0 +1,81 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {switchMap, takeWhile, tap, withLatestFrom} from 'rxjs/operators';
+import {
+  ChecksApiConfig,
+  ChecksProvider,
+  FetchResponse,
+  ResponseCode,
+} from '../../elements/plugins/gr-checks-api/gr-checks-api-types';
+import {change$, currentPatchNum$} from '../change/change-model';
+import {updateStateSetProvider, updateStateSetResults} from './checks-model';
+import {
+  BehaviorSubject,
+  combineLatest,
+  from,
+  Observable,
+  of,
+  Subject,
+} from 'rxjs';
+
+export class ChecksService {
+  private readonly providers: {[name: string]: ChecksProvider} = {};
+
+  private readonly anouncementSubjects: {[name: string]: Subject<void>} = {};
+
+  private changeAndPatchNum$ = change$.pipe(withLatestFrom(currentPatchNum$));
+
+  announceUpdate(pluginName: string) {
+    this.anouncementSubjects[pluginName].next();
+  }
+
+  register(
+    pluginName: string,
+    provider: ChecksProvider,
+    config: ChecksApiConfig
+  ) {
+    this.providers[pluginName] = provider;
+    this.anouncementSubjects[pluginName] = new BehaviorSubject<void>(undefined);
+    updateStateSetProvider(pluginName, config);
+    // Both, changed numbers and and announceUpdate request should trigger.
+    combineLatest([
+      this.changeAndPatchNum$,
+      this.anouncementSubjects[pluginName],
+    ])
+      .pipe(
+        takeWhile(_ => !!this.providers[pluginName]),
+        switchMap(
+          ([[change, patchNum], _]): Observable<FetchResponse> => {
+            if (!change || !patchNum || typeof patchNum !== 'number') {
+              return of({
+                responseCode: ResponseCode.OK,
+                runs: [],
+              });
+            }
+            return from(
+              this.providers[pluginName].fetch(change._number, patchNum)
+            );
+          }
+        ),
+        tap(response => {
+          updateStateSetResults(pluginName, response.runs ?? []);
+        })
+      )
+      .subscribe(() => {});
+  }
+}
diff --git a/polygerrit-ui/app/services/flags/flags.ts b/polygerrit-ui/app/services/flags/flags.ts
index ba33954..d2b7166 100644
--- a/polygerrit-ui/app/services/flags/flags.ts
+++ b/polygerrit-ui/app/services/flags/flags.ts
@@ -24,8 +24,8 @@
  * @desc Experiment ids used in Gerrit.
  */
 export enum KnownExperimentId {
-  PATCHSET_COMMENTS = 'UiFeature__patchset_comments',
   NEW_CONTEXT_CONTROLS = 'UiFeature__new_context_controls',
   CI_REBOOT_CHECKS = 'UiFeature__ci_reboot_checks',
   NEW_CHANGE_SUMMARY_UI = 'UiFeature__new_change_summary_ui',
+  PORTING_COMMENTS = 'UiFeature__porting_comments',
 }
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
index c47f3e2..08952f6 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting.ts
@@ -21,10 +21,6 @@
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 export type EventDetails = any;
 
-export const PORTING_COMMENTS_DIFF_LATENCY_LABEL = 'PortingCommentsDiffLatency';
-export const PORTING_COMMENTS_CHANGE_LATENCY_LABEL =
-  'PortingCommentsChangeLatency';
-
 export interface Timer {
   reset(): this;
   end(): this;
@@ -55,6 +51,7 @@
   reportExtension(name: string): void;
   pluginLoaded(name: string): void;
   pluginsLoaded(pluginsList?: string[]): void;
+  error(err: unknown, reporter?: string, details?: EventDetails): void;
   /**
    * Reset named timer.
    */
@@ -91,6 +88,16 @@
    */
   reportRpcTiming(anonymizedUrl: string, elapsed: number): void;
   reportLifeCycle(eventName: string, details?: EventDetails): void;
+
+  /**
+   * Use this method, if you want to check/count how often a certain code path
+   * is executed. For example you can use this method to prove that certain code
+   * paths are dead: Add reportExecution(), check the logs a week later, then
+   * safely remove the coe.
+   *
+   * Every execution is only reported once per session.
+   */
+  reportExecution(id: string, details: EventDetails): void;
   reportInteraction(eventName: string, details?: EventDetails): void;
   /**
    * A draft interaction was started. Update the time-betweeen-draft-actions
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
index 668834e..1b0bf45 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting_impl.ts
@@ -44,6 +44,7 @@
     EXTENSION_DETECTED: 'Extension detected',
     PLUGINS_INSTALLED: 'Plugins installed',
     VISIBILITY: 'Visibility',
+    EXECUTION: 'Execution',
   },
 };
 
@@ -114,7 +115,22 @@
 
 export function initErrorReporter(appContext: AppContext) {
   const reportingService = appContext.reportingService;
-  // TODO(dmfilippo): TS-fix-any oldOnError - define correct type
+
+  const normalizeError = (err: Error | unknown) => {
+    if (err instanceof Error) {
+      return err;
+    }
+    let msg = '';
+    if (typeof err === 'string') {
+      msg += err;
+    } else {
+      msg += JSON.stringify(err);
+    }
+    const error = new Error(msg);
+    error.stack = 'unknown';
+    return error;
+  };
+  // TODO(dmfilippov): TS-fix-any oldOnError - define correct type
   const onError = function (
     oldOnError: Function,
     msg: Event | string,
@@ -127,29 +143,15 @@
       oldOnError(msg, url, line, column, error);
     }
     if (error) {
-      line = line || error.lineNumber;
-      column = column || error.columnNumber;
-      let shortenedErrorStack = msg;
-      if (error.stack) {
-        const errorStackLines = error.stack.split('\n');
-        shortenedErrorStack = errorStackLines
-          .slice(0, Math.min(3, errorStackLines.length))
-          .join('\n');
-      }
-      msg = shortenedErrorStack || error.toString();
+      line = line ?? error.lineNumber;
+      column = column ?? error.columnNumber;
     }
-    const payload = {
-      url,
+    reportingService.error(normalizeError(error), 'onError', {
       line,
       column,
-      error,
-    };
-    reportingService.reporter(
-      ERROR.TYPE,
-      ERROR.CATEGORY.EXCEPTION,
-      `${msg}`,
-      payload
-    );
+      url,
+      msg,
+    });
     return true;
   };
   // TODO(dmfilippov): TS-fix-any unclear what is context
@@ -169,16 +171,7 @@
     context.addEventListener(
       'unhandledrejection',
       (e: PromiseRejectionEvent) => {
-        const msg = e.reason.message;
-        const payload = {
-          error: e.reason,
-        };
-        reportingService.reporter(
-          ERROR.TYPE,
-          ERROR.CATEGORY.EXCEPTION,
-          msg,
-          payload
-        );
+        reportingService.error(normalizeError(e.reason), 'unhandledrejection');
       }
     );
   };
@@ -311,6 +304,12 @@
 
   private _slowRpcList: SlowRpcCall[] = [];
 
+  /**
+   * Keeps track of which ids were already reported to have been executed.
+   * Execution ids should only be reported once per session.
+   */
+  private executionReported = new Set<string>();
+
   public readonly hiddenDurationTimer = new HiddenDurationTimer();
 
   constructor(flagsService: FlagsService) {
@@ -788,6 +787,19 @@
     );
   }
 
+  reportExecution(id: string, details: EventDetails) {
+    if (this.executionReported.has(id)) return;
+    this.executionReported.add(id);
+    this.reporter(
+      LIFECYCLE.TYPE,
+      LIFECYCLE.CATEGORY.EXECUTION,
+      id,
+      undefined,
+      details,
+      false
+    );
+  }
+
   /**
    * A draft interaction was started. Update the time-betweeen-draft-actions
    * timer.
@@ -809,6 +821,19 @@
     timer.end().reset();
   }
 
+  error(error: Error, errorSource?: string, details?: EventDetails) {
+    const eventDetails = details ?? {};
+    const message = `${errorSource ? errorSource + ': ' : ''}${error.message}`;
+
+    this.reporter(
+      ERROR.TYPE,
+      ERROR.CATEGORY.EXCEPTION,
+      message,
+      {error},
+      {...eventDetails, stack: error.stack}
+    );
+  }
+
   reportErrorDialog(message: string) {
     this.reporter(
       ERROR.TYPE,
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts b/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts
index 924ddd9..1e75d88 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting_mock.ts
@@ -50,6 +50,8 @@
   recordDraftInteraction: () => {},
   reporter: () => {},
   reportErrorDialog: () => {},
+  error: () => {},
+  reportExecution: () => {},
   reportExtension: () => {},
   reportInteraction: () => {},
   reportLifeCycle: () => {},
diff --git a/polygerrit-ui/app/services/gr-reporting/gr-reporting_test.js b/polygerrit-ui/app/services/gr-reporting/gr-reporting_test.js
index 08e4a55..6e56ab1 100644
--- a/polygerrit-ui/app/services/gr-reporting/gr-reporting_test.js
+++ b/polygerrit-ui/app/services/gr-reporting/gr-reporting_test.js
@@ -463,23 +463,14 @@
       const error = new Error('bar');
       error.stack = undefined;
       emulateThrow('bar', 'http://url', 4, 2, error);
-      assert.isTrue(reporter.calledWith('error', 'exception', 'bar'));
-      const payload = reporter.lastCall.args[3];
-      assert.deepEqual(payload, {
-        url: 'http://url',
-        line: 4,
-        column: 2,
-        error,
-      });
+      assert.isTrue(reporter.calledWith('error', 'exception', 'onError: bar'));
     });
 
-    test('is reported with 3 lines of stack', () => {
+    test('is reported with stack', () => {
       const error = new Error('bar');
       emulateThrow('bar', 'http://url', 4, 2, error);
-      const expectedStack = error.stack.split('\n').slice(0, 3)
-          .join('\n');
-      assert.isTrue(reporter.calledWith('error', 'exception',
-          expectedStack));
+      const eventDetails = reporter.lastCall.args[4];
+      assert.equal(error.stack, eventDetails.stack);
     });
 
     test('prevent default event handler', () => {
@@ -487,12 +478,10 @@
     });
 
     test('unhandled rejection', () => {
-      fakeWindow.handlers['unhandledrejection']({
-        reason: {
-          message: 'bar',
-        },
-      });
-      assert.isTrue(reporter.calledWith('error', 'exception', 'bar'));
+      const newError = new Error('bar');
+      fakeWindow.handlers['unhandledrejection']({reason: newError});
+      assert.isTrue(reporter.calledWith('error', 'exception',
+          'unhandledrejection: bar'));
     });
   });
 });
diff --git a/polygerrit-ui/app/services/router/router-model.ts b/polygerrit-ui/app/services/router/router-model.ts
new file mode 100644
index 0000000..201cb3f
--- /dev/null
+++ b/polygerrit-ui/app/services/router/router-model.ts
@@ -0,0 +1,76 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {NumericChangeId, PatchSetNum} from '../../types/common';
+import {BehaviorSubject, Observable} from 'rxjs';
+import {distinctUntilChanged, map} from 'rxjs/operators';
+
+export enum GerritView {
+  ADMIN = 'admin',
+  AGREEMENTS = 'agreements',
+  CHANGE = 'change',
+  DASHBOARD = 'dashboard',
+  DIFF = 'diff',
+  DOCUMENTATION_SEARCH = 'documentation-search',
+  EDIT = 'edit',
+  GROUP = 'group',
+  PLUGIN_SCREEN = 'plugin-screen',
+  REPO = 'repo',
+  ROOT = 'root',
+  SEARCH = 'search',
+  SETTINGS = 'settings',
+}
+
+export interface RouterState {
+  view?: GerritView;
+  changeNum?: NumericChangeId;
+  patchNum?: PatchSetNum;
+}
+
+// TODO: Figure out how to best enforce immutability of all states. Use Immer?
+// Use DeepReadOnly?
+const initialState: RouterState = {};
+
+const privateState$ = new BehaviorSubject<RouterState>(initialState);
+
+// Re-exporting as Observable so that you can only subscribe, but not emit.
+export const routerState$: Observable<RouterState> = privateState$;
+
+// Must only be used by the router service or whatever is in control of this
+// model.
+export function updateState(
+  view?: GerritView,
+  changeNum?: NumericChangeId,
+  patchNum?: PatchSetNum
+) {
+  privateState$.next({
+    ...privateState$.getValue(),
+    view,
+    changeNum,
+    patchNum,
+  });
+}
+
+export const routerChangeNum$ = routerState$.pipe(
+  map(state => state.changeNum),
+  distinctUntilChanged()
+);
+
+export const routerPatchNum$ = routerState$.pipe(
+  map(state => state.patchNum),
+  distinctUntilChanged()
+);
diff --git a/polygerrit-ui/app/services/services/gr-rest-api/gr-rest-api.ts b/polygerrit-ui/app/services/services/gr-rest-api/gr-rest-api.ts
index cf064c1..f556af0 100644
--- a/polygerrit-ui/app/services/services/gr-rest-api/gr-rest-api.ts
+++ b/polygerrit-ui/app/services/services/gr-rest-api/gr-rest-api.ts
@@ -182,23 +182,19 @@
 
   getChangeSuggestedReviewers(
     changeNum: NumericChangeId,
-    input: string,
-    errFn?: ErrorCallback
+    input: string
   ): Promise<SuggestedReviewerInfo[] | undefined>;
   getChangeSuggestedCCs(
     changeNum: NumericChangeId,
-    input: string,
-    errFn?: ErrorCallback
+    input: string
   ): Promise<SuggestedReviewerInfo[] | undefined>;
   getSuggestedAccounts(
     input: string,
-    n?: number,
-    errFn?: ErrorCallback
+    n?: number
   ): Promise<AccountInfo[] | undefined>;
   getSuggestedGroups(
     input: string,
-    n?: number,
-    errFn?: ErrorCallback
+    n?: number
   ): Promise<GroupNameToGroupInfoMap | undefined>;
   executeChangeAction(
     changeNum: NumericChangeId,
@@ -232,30 +228,14 @@
   getDiffPreferences(): Promise<DiffPreferencesInfo | undefined>;
 
   saveDiffPreferences(prefs: DiffPreferenceInput): Promise<Response>;
-  saveDiffPreferences(
-    prefs: DiffPreferenceInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-  saveDiffPreferences(
-    prefs: DiffPreferenceInput,
-    errFn?: ErrorCallback
-  ): Promise<Response>;
 
   getEditPreferences(): Promise<EditPreferencesInfo | undefined>;
 
   saveEditPreferences(prefs: EditPreferencesInfo): Promise<Response>;
-  saveEditPreferences(
-    prefs: EditPreferencesInfo,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-  saveEditPreferences(
-    prefs: EditPreferencesInfo,
-    errFn?: ErrorCallback
-  ): Promise<Response>;
 
   getAccountEmails(): Promise<EmailInfo[] | undefined>;
   deleteAccountEmail(email: string): Promise<Response>;
-  setPreferredAccountEmail(email: string, errFn?: ErrorCallback): Promise<void>;
+  setPreferredAccountEmail(email: string): Promise<void>;
 
   getAccountSSHKeys(): Promise<SshKeyInfo[] | undefined>;
   deleteAccountSSHKey(key: string): void;
@@ -267,25 +247,11 @@
     revision: BranchInput
   ): Promise<Response>;
 
-  createRepoBranch(
-    name: RepoName,
-    branch: BranchName,
-    revision: BranchInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
   createRepoTag(
     name: RepoName,
     tag: string,
     revision: TagInput
   ): Promise<Response>;
-
-  createRepoTag(
-    name: RepoName,
-    tag: string,
-    revision: TagInput,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
   addAccountGPGKey(key: GpgKeysInput): Promise<Record<string, GpgKeyInfo>>;
   deleteAccountGPGKey(id: GpgKeyId): Promise<Response>;
   getAccountGPGKeys(): Promise<Record<string, GpgKeyInfo>>;
@@ -325,11 +291,6 @@
   ): Promise<ProjectAccessInfo | undefined>;
 
   createRepo(config: ProjectInput & {name: RepoName}): Promise<Response>;
-  createRepo(
-    config: ProjectInput & {name: RepoName},
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-  createRepo(config: ProjectInput, errFn?: ErrorCallback): Promise<Response>;
 
   getRepo(
     repo: RepoName,
@@ -452,9 +413,7 @@
   ): Promise<Response>;
 
   getDiffChangeDetail(
-    changeNum: NumericChangeId,
-    errFn?: ErrorCallback,
-    cancelCondition?: CancelConditionCallback
+    changeNum: NumericChangeId
   ): Promise<ChangeInfo | undefined | null>;
 
   getPortedComments(
@@ -522,11 +481,6 @@
     | Promise<PathToCommentsInfoMap | undefined>;
 
   createGroup(config: GroupInput & {name: string}): Promise<Response>;
-  createGroup(
-    config: GroupInput & {name: string},
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-  createGroup(config: GroupInput, errFn?: ErrorCallback): Promise<Response>;
 
   getPlugins(
     filter: string,
@@ -574,33 +528,21 @@
 
   generateAccountHttpPassword(): Promise<Password>;
 
-  setAccountName(name: string, errFn?: ErrorCallback): Promise<void>;
+  setAccountName(name: string): Promise<void>;
 
-  setAccountUsername(username: string, errFn?: ErrorCallback): Promise<void>;
+  setAccountUsername(username: string): Promise<void>;
 
   getWatchedProjects(): Promise<ProjectWatchInfo[] | undefined>;
 
   saveWatchedProjects(
-    projects: ProjectWatchInfo[],
-    errFn?: ErrorCallback
+    projects: ProjectWatchInfo[]
   ): Promise<ProjectWatchInfo[]>;
 
-  deleteWatchedProjects(
-    projects: ProjectWatchInfo[]
-  ): Promise<Response | undefined>;
-  deleteWatchedProjects(
-    projects: ProjectWatchInfo[],
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-  deleteWatchedProjects(
-    projects: ProjectWatchInfo[],
-    errFn?: ErrorCallback
-  ): Promise<Response | undefined>;
+  deleteWatchedProjects(projects: ProjectWatchInfo[]): Promise<Response>;
 
   getSuggestedProjects(
     inputVal: string,
-    n?: number,
-    errFn?: ErrorCallback
+    n?: number
   ): Promise<NameToProjectInfoMap | undefined>;
 
   invalidateGroupsCache(): void;
@@ -616,11 +558,8 @@
     user: AccountId | undefined | null,
     reason: string
   ): Promise<Response>;
-  setAccountDisplayName(
-    displayName: string,
-    errFn?: ErrorCallback
-  ): Promise<void>;
-  setAccountStatus(status: string, errFn?: ErrorCallback): Promise<void>;
+  setAccountDisplayName(displayName: string): Promise<void>;
+  setAccountStatus(status: string): Promise<void>;
   getAvatarChangeUrl(): Promise<string | undefined>;
   setDescription(
     changeNum: NumericChangeId,
@@ -660,10 +599,7 @@
     errFn?: ErrorCallback
   ): Promise<GroupAuditEventInfo[] | undefined>;
 
-  getGroupMembers(
-    groupName: GroupId | GroupName,
-    errFn?: ErrorCallback
-  ): Promise<AccountInfo[] | undefined>;
+  getGroupMembers(groupName: GroupId | GroupName): Promise<AccountInfo[]>;
 
   getIncludedGroup(
     groupName: GroupId | GroupName
@@ -690,10 +626,7 @@
     includedGroup: GroupId
   ): Promise<Response>;
 
-  runRepoGC(
-    repo: RepoName,
-    errFn?: ErrorCallback
-  ): Promise<Response | undefined>;
+  runRepoGC(repo: RepoName): Promise<Response>;
   getFileContent(
     changeNum: NumericChangeId,
     path: string,
@@ -790,11 +723,6 @@
 
   addAccountEmail(email: string): Promise<Response>;
 
-  addAccountEmail(
-    email: string,
-    errFn?: ErrorCallback
-  ): Promise<Response | undefined>;
-
   saveChangeReviewed(
     changeNum: NumericChangeId,
     reviewed: boolean
@@ -849,15 +777,7 @@
     reviewed: boolean
   ): Promise<Response>;
 
-  saveFileReviewed(
-    changeNum: NumericChangeId,
-    patchNum: PatchSetNum,
-    path: string,
-    reviewed: boolean,
-    errFn: ErrorCallback
-  ): Promise<Response | undefined>;
-
-  getTopMenus(errFn?: ErrorCallback): Promise<TopMenuEntryInfo[] | undefined>;
+  getTopMenus(): Promise<TopMenuEntryInfo[] | undefined>;
 
   setInProjectLookup(changeNum: NumericChangeId, project: RepoName): void;
   getMergeable(changeNum: NumericChangeId): Promise<MergeableInfo | undefined>;
diff --git a/polygerrit-ui/app/styles/shared-styles.ts b/polygerrit-ui/app/styles/shared-styles.ts
index 695ae24..c2baaa9 100644
--- a/polygerrit-ui/app/styles/shared-styles.ts
+++ b/polygerrit-ui/app/styles/shared-styles.ts
@@ -15,6 +15,8 @@
  * limitations under the License.
  */
 
+import {css} from 'lit-element';
+
 // Mark the file as a module. Otherwise typescript assumes this is a script
 // and $_documentContainer is a global variable.
 // See: https://www.typescriptlang.org/docs/handbook/modules.html
@@ -22,189 +24,276 @@
 
 const $_documentContainer = document.createElement('template');
 
+export const sharedStyles = css`
+  /* CSS reset */
+
+  html,
+  body,
+  button,
+  div,
+  span,
+  applet,
+  object,
+  iframe,
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6,
+  p,
+  blockquote,
+  pre,
+  a,
+  abbr,
+  acronym,
+  address,
+  big,
+  cite,
+  code,
+  del,
+  dfn,
+  em,
+  img,
+  ins,
+  kbd,
+  q,
+  s,
+  samp,
+  small,
+  strike,
+  strong,
+  sub,
+  sup,
+  tt,
+  var,
+  b,
+  u,
+  i,
+  center,
+  dl,
+  dt,
+  dd,
+  ol,
+  ul,
+  li,
+  fieldset,
+  form,
+  label,
+  legend,
+  table,
+  caption,
+  tbody,
+  tfoot,
+  thead,
+  tr,
+  th,
+  td,
+  article,
+  aside,
+  canvas,
+  details,
+  embed,
+  figure,
+  figcaption,
+  footer,
+  header,
+  hgroup,
+  main,
+  menu,
+  nav,
+  output,
+  ruby,
+  section,
+  summary,
+  time,
+  mark,
+  audio,
+  video {
+    border: 0;
+    box-sizing: border-box;
+    font-size: 100%;
+    font: inherit;
+    margin: 0;
+    padding: 0;
+    vertical-align: baseline;
+  }
+  *::after,
+  *::before {
+    box-sizing: border-box;
+  }
+  input {
+    background-color: var(--background-color-primary);
+    border: 1px solid var(--border-color);
+    border-radius: var(--border-radius);
+    box-sizing: border-box;
+    color: var(--primary-text-color);
+    margin: 0;
+    padding: var(--spacing-s);
+  }
+  iron-autogrow-textarea {
+    background-color: inherit;
+    color: var(--primary-text-color);
+    border: 1px solid var(--border-color);
+    border-radius: var(--border-radius);
+    padding: 0;
+    box-sizing: border-box;
+    /* iron-autogrow-textarea has a "-webkit-appearance: textarea" :host
+        css rule, which prevents overriding the border color. Clear that. */
+    -webkit-appearance: none;
+
+    --iron-autogrow-textarea: {
+      box-sizing: border-box;
+      padding: var(--spacing-s);
+    }
+  }
+  a {
+    color: var(--link-color);
+  }
+  input,
+  textarea,
+  select,
+  button {
+    font: inherit;
+  }
+  ol,
+  ul {
+    list-style: none;
+  }
+  blockquote,
+  q {
+    quotes: none;
+  }
+  blockquote:before,
+  blockquote:after,
+  q:before,
+  q:after {
+    content: '';
+    content: none;
+  }
+  table {
+    border-collapse: collapse;
+    border-spacing: 0;
+  }
+
+  /* Fonts */
+
+  .font-normal {
+    font-size: var(--font-size-normal);
+    font-weight: var(--font-weight-normal);
+    line-height: var(--line-height-normal);
+  }
+  .font-small {
+    font-size: var(--font-size-small);
+    font-weight: var(--font-weight-normal);
+    line-height: var(--line-height-small);
+  }
+  .heading-1 {
+    font-family: var(--header-font-family);
+    font-size: var(--font-size-h1);
+    font-weight: var(--font-weight-h1);
+    line-height: var(--line-height-h1);
+  }
+  .heading-2 {
+    font-family: var(--header-font-family);
+    font-size: var(--font-size-h2);
+    font-weight: var(--font-weight-h2);
+    line-height: var(--line-height-h2);
+  }
+  .heading-3 {
+    font-family: var(--header-font-family);
+    font-size: var(--font-size-h3);
+    font-weight: var(--font-weight-h3);
+    line-height: var(--line-height-h3);
+  }
+  iron-icon {
+    color: var(--deemphasized-text-color);
+    --iron-icon-height: 20px;
+    --iron-icon-width: 20px;
+  }
+
+  /* Stopgap solution until we remove hidden$ attributes. */
+
+  :host([hidden]),
+  [hidden] {
+    display: none !important;
+  }
+  .separator {
+    border-left: 1px solid var(--border-color);
+    height: 20px;
+    margin: 0 8px;
+  }
+  .separator.transparent {
+    border-color: transparent;
+  }
+  paper-toggle-button {
+    --paper-toggle-button-checked-bar-color: var(--link-color);
+    --paper-toggle-button-checked-button-color: var(--link-color);
+  }
+  paper-tabs {
+    font-size: var(--font-size-h3);
+    font-weight: var(--font-weight-h3);
+    line-height: var(--line-height-h3);
+    --paper-font-common-base: {
+      font-family: var(--header-font-family);
+      -webkit-font-smoothing: initial;
+    }
+    --paper-tab-content-focused: {
+      /* paper-tabs uses 700 here, which can look awkward */
+      font-weight: var(--font-weight-h3);
+    }
+    --paper-tab-content-unselected: {
+      /* paper-tabs uses 0.8 here, but we want to control the color directly */
+      opacity: 1;
+      color: var(--deemphasized-text-color);
+    }
+  }
+  iron-autogrow-textarea {
+    /** This is needed for firefox */
+    --iron-autogrow-textarea_-_white-space: pre-wrap;
+  }
+  strong {
+    font-weight: var(--font-weight-bold);
+  }
+
+  .assistive-tech-only {
+    user-select: none;
+    clip: rect(1px, 1px, 1px, 1px);
+    height: 1px;
+    margin: 0;
+    overflow: hidden;
+    padding: 0;
+    position: absolute;
+    white-space: nowrap;
+    width: 1px;
+    z-index: -1000;
+  }
+
+  /** BEGIN: loading spiner */
+  .loadingSpin {
+    border: 2px solid var(--disabled-button-background-color);
+    border-top: 2px solid var(--primary-button-background-color);
+    border-radius: 50%;
+    width: 10px;
+    height: 10px;
+    animation: spin 2s linear infinite;
+    margin-right: var(--spacing-s);
+  }
+  @keyframes spin {
+    0% {
+      transform: rotate(0deg);
+    }
+    100% {
+      transform: rotate(360deg);
+    }
+  }
+  /** END: loading spiner */
+`;
+
 $_documentContainer.innerHTML = `<dom-module id="shared-styles">
   <template>
     <style>
-
-      /* CSS reset */
-
-      html, body, button, div, span, applet, object, iframe, h1, h2, h3,
-      h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite,
-      code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub,
-      sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form,
-      label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article,
-      aside, canvas, details, embed, figure, figcaption, footer, header, hgroup,
-      main, menu, nav, output, ruby, section, summary, time, mark, audio, video {
-        border: 0;
-        box-sizing: border-box;
-        font-size: 100%;
-        font: inherit;
-        margin: 0;
-        padding: 0;
-        vertical-align: baseline;
-      }
-      *::after,
-      *::before {
-        box-sizing: border-box;
-      }
-      input {
-        background-color: var(--background-color-primary);
-        border: 1px solid var(--border-color);
-        border-radius: var(--border-radius);
-        box-sizing: border-box;
-        color: var(--primary-text-color);
-        margin: 0;
-        padding: var(--spacing-s);
-      }
-      iron-autogrow-textarea {
-        background-color: inherit;
-        color: var(--primary-text-color);
-        border: 1px solid var(--border-color);
-        border-radius: var(--border-radius);
-        padding: 0;
-        box-sizing: border-box;
-        /* iron-autogrow-textarea has a "-webkit-appearance: textarea" :host
-           css rule, which prevents overriding the border color. Clear that. */
-        -webkit-appearance: none;
-
-        --iron-autogrow-textarea: {
-          box-sizing: border-box;
-          padding: var(--spacing-s);
-        };
-      }
-      a {
-        color: var(--link-color);
-      }
-      input,
-      textarea,
-      select,
-      button {
-        font: inherit;
-      }
-      ol, ul {
-        list-style: none;
-      }
-      blockquote, q {
-        quotes: none;
-      }
-      blockquote:before, blockquote:after,
-      q:before, q:after {
-        content: '';
-        content: none;
-      }
-      table {
-        border-collapse: collapse;
-        border-spacing: 0;
-      }
-
-      /* Fonts */
-
-      .font-normal {
-        font-size: var(--font-size-normal);
-        font-weight: var(--font-weight-normal);
-        line-height: var(--line-height-normal);
-      }
-      .font-small {
-        font-size: var(--font-size-small);
-        font-weight: var(--font-weight-normal);
-        line-height: var(--line-height-small);
-      }
-      .heading-1 {
-        font-family: var(--header-font-family);
-        font-size: var(--font-size-h1);
-        font-weight: var(--font-weight-h1);
-        line-height: var(--line-height-h1);
-      }
-      .heading-2 {
-        font-family: var(--header-font-family);
-        font-size: var(--font-size-h2);
-        font-weight: var(--font-weight-h2);
-        line-height: var(--line-height-h2);
-      }
-      .heading-3 {
-        font-family: var(--header-font-family);
-        font-size: var(--font-size-h3);
-        font-weight: var(--font-weight-h3);
-        line-height: var(--line-height-h3);
-      }
-      iron-icon {
-        color: var(--deemphasized-text-color);
-        --iron-icon-height: 20px;
-        --iron-icon-width: 20px;
-      }
-
-      /* Stopgap solution until we remove hidden$ attributes. */
-
-      :host([hidden]),
-      [hidden] {
-        display: none !important;
-      }
-      .separator {
-        border-left: 1px solid var(--border-color);
-        height: 20px;
-        margin: 0 8px;
-      }
-      .separator.transparent {
-        border-color: transparent;
-      }
-      paper-toggle-button {
-        --paper-toggle-button-checked-bar-color: var(--link-color);
-        --paper-toggle-button-checked-button-color: var(--link-color);
-      }
-      paper-tabs {
-        font-size: var(--font-size-h3);
-        font-weight: var(--font-weight-h3);
-        line-height: var(--line-height-h3);
-        --paper-font-common-base: {
-          font-family: var(--header-font-family);
-          -webkit-font-smoothing: initial;
-        };
-        --paper-tab-content-focused: {
-          /* paper-tabs uses 700 here, which can look awkward */
-          font-weight: var(--font-weight-h3);
-        };
-        --paper-tab-content-unselected: {
-          /* paper-tabs uses 0.8 here, but we want to control the color directly */
-          opacity: 1;
-          color: var(--deemphasized-text-color);
-        };
-      }
-      iron-autogrow-textarea {
-        /** This is needed for firefox */
-        --iron-autogrow-textarea_-_white-space: pre-wrap;
-      }
-      strong {
-        font-weight: var(--font-weight-bold);
-      }
-
-      .assistive-tech-only {
-        user-select: none;
-        clip: rect(1px, 1px, 1px, 1px);
-        height: 1px;
-        margin: 0;
-        overflow: hidden;
-        padding: 0;
-        position: absolute;
-        white-space: nowrap;
-        width: 1px;
-        z-index: -1000;
-      }
-
-      /** BEGIN: loading spiner */
-      .loadingSpin {
-        border: 2px solid var(--disabled-button-background-color);
-        border-top: 2px solid var(--primary-button-background-color);
-        border-radius: 50%;
-        width: 10px;
-        height: 10px;
-        animation: spin 2s linear infinite;
-        margin-right: var(--spacing-s);
-      }
-      @keyframes spin {
-        0% { transform: rotate(0deg); }
-        100% { transform: rotate(360deg); }
-      }
-      /** END: loading spiner */
+    ${sharedStyles.cssText}
     </style>
   </template>
 </dom-module>`;
diff --git a/polygerrit-ui/app/test/test-data-generators.ts b/polygerrit-ui/app/test/test-data-generators.ts
index 248e937..444d0bf 100644
--- a/polygerrit-ui/app/test/test-data-generators.ts
+++ b/polygerrit-ui/app/test/test-data-generators.ts
@@ -60,6 +60,7 @@
   AccountDetailInfo,
   Requirement,
   RequirementType,
+  UrlEncodedCommentId,
 } from '../types/common';
 import {
   AccountsVisibility,
@@ -77,17 +78,20 @@
   SubmitType,
   TimeFormat,
   RequirementStatus,
+  CommentSide,
 } from '../constants/constants';
 import {formatDate} from '../utils/date-util';
 import {GetDiffCommentsOutput} from '../services/services/gr-rest-api/gr-rest-api';
 import {AppElementChangeViewParams} from '../elements/gr-app-types';
-import {GerritView} from '../elements/core/gr-navigation/gr-navigation';
 import {
   EditRevisionInfo,
   ParsedChangeInfo,
 } from '../elements/shared/gr-rest-api-interface/gr-reviewer-updates-parser';
 import {CommitInfoWithRequiredCommit} from '../elements/change/gr-change-metadata/gr-change-metadata';
 import {WebLinkInfo} from '../types/diff';
+import {UIComment, UIDraft, createCommentThreads} from '../utils/comment-util';
+import {GerritView} from '../services/router/router-model';
+import {ChangeComments} from '../elements/diff/gr-comment-api/gr-comment-api';
 
 export function dateToTimestamp(date: Date): Timestamp {
   const nanosecondSuffix = '.000000000';
@@ -441,3 +445,135 @@
     image_url: 'gitiles.jpg',
   };
 }
+
+export function createComment(): UIComment {
+  return {
+    patch_set: 1 as PatchSetNum,
+    id: '12345' as UrlEncodedCommentId,
+    side: CommentSide.REVISION,
+    line: 1,
+    message: 'hello world',
+    updated: '2018-02-13 22:48:48.018000000' as Timestamp,
+    unresolved: false,
+  };
+}
+
+export function createDraft(): UIDraft {
+  return {
+    ...createComment(),
+    collapsed: false,
+    __draft: true,
+    __editing: false,
+  };
+}
+
+export function createChangeComments(): ChangeComments {
+  const comments = {
+    '/COMMIT_MSG': [
+      {
+        ...createComment(),
+        message: 'Done',
+        updated: '2017-02-08 16:40:49' as Timestamp,
+        id: '1' as UrlEncodedCommentId,
+      },
+      {
+        ...createComment(),
+        message: 'oh hay',
+        updated: '2017-02-09 16:40:49' as Timestamp,
+        id: '2' as UrlEncodedCommentId,
+      },
+      {
+        ...createComment(),
+        patch_set: 2 as PatchSetNum,
+        message: 'hello',
+        updated: '2017-02-10 16:40:49' as Timestamp,
+        id: '3' as UrlEncodedCommentId,
+      },
+    ],
+    'myfile.txt': [
+      {
+        ...createComment(),
+        message: 'good news!',
+        updated: '2017-02-08 16:40:49' as Timestamp,
+        id: '4' as UrlEncodedCommentId,
+      },
+      {
+        ...createComment(),
+        patch_set: 2 as PatchSetNum,
+        message: 'wat!?',
+        updated: '2017-02-09 16:40:49' as Timestamp,
+        id: '5' as UrlEncodedCommentId,
+      },
+      {
+        ...createComment(),
+        patch_set: 2 as PatchSetNum,
+        message: 'hi',
+        updated: '2017-02-10 16:40:49' as Timestamp,
+        id: '6' as UrlEncodedCommentId,
+      },
+    ],
+    'unresolved.file': [
+      {
+        ...createComment(),
+        patch_set: 2 as PatchSetNum,
+        message: 'wat!?',
+        updated: '2017-02-09 16:40:49' as Timestamp,
+        id: '7' as UrlEncodedCommentId,
+        unresolved: true,
+      },
+      {
+        ...createComment(),
+        patch_set: 2 as PatchSetNum,
+        message: 'hi',
+        updated: '2017-02-10 16:40:49' as Timestamp,
+        id: '8' as UrlEncodedCommentId,
+        in_reply_to: '7' as UrlEncodedCommentId,
+        unresolved: false,
+      },
+      {
+        ...createComment(),
+        patch_set: 2 as PatchSetNum,
+        message: 'good news!',
+        updated: '2017-02-08 16:40:49' as Timestamp,
+        id: '9' as UrlEncodedCommentId,
+        unresolved: true,
+      },
+    ],
+  };
+  const drafts = {
+    '/COMMIT_MSG': [
+      {
+        ...createDraft(),
+        message: 'hi',
+        updated: '2017-02-15 16:40:49' as Timestamp,
+        id: '10' as UrlEncodedCommentId,
+        unresolved: true,
+      },
+      {
+        ...createDraft(),
+        message: 'fyi',
+        updated: '2017-02-15 16:40:49' as Timestamp,
+        id: '11' as UrlEncodedCommentId,
+        unresolved: false,
+      },
+    ],
+    'unresolved.file': [
+      {
+        ...createDraft(),
+        message: 'hi',
+        updated: '2017-02-11 16:40:49' as Timestamp,
+        id: '12' as UrlEncodedCommentId,
+        unresolved: false,
+      },
+    ],
+  };
+  return new ChangeComments(comments, {}, drafts, {}, {});
+}
+
+export function createCommentThread(comments: UIComment[]) {
+  comments = comments.map(comment => {
+    return {...createComment(), ...comment};
+  });
+  const threads = createCommentThreads(comments);
+  return threads.length > 0 ? threads[0] : {};
+}
diff --git a/polygerrit-ui/app/test/test-utils.ts b/polygerrit-ui/app/test/test-utils.ts
index cccba5d..97c220d 100644
--- a/polygerrit-ui/app/test/test-utils.ts
+++ b/polygerrit-ui/app/test/test-utils.ts
@@ -105,6 +105,25 @@
   cleanups.push(cleanupCallback);
 }
 
+export function addListenerForTest(
+  el: EventTarget,
+  type: string,
+  listener: EventListenerOrEventListenerObject
+) {
+  el.addEventListener(type, listener);
+  registerListenerCleanup(el, type, listener);
+}
+
+export function registerListenerCleanup(
+  el: EventTarget,
+  type: string,
+  listener: EventListenerOrEventListenerObject
+) {
+  registerTestCleanup(() => {
+    el.removeEventListener(type, listener);
+  });
+}
+
 export function cleanupTestUtils() {
   cleanups.forEach(cleanup => cleanup());
   cleanups.splice(0);
@@ -142,7 +161,7 @@
  *   ...
  */
 export function listenOnce(el: EventTarget, eventType: string) {
-  return new Promise(resolve => {
+  return new Promise<void>(resolve => {
     const listener = () => {
       removeEventListener();
       resolve();
diff --git a/polygerrit-ui/app/types/common.ts b/polygerrit-ui/app/types/common.ts
index b454b6e..5574add 100644
--- a/polygerrit-ui/app/types/common.ts
+++ b/polygerrit-ui/app/types/common.ts
@@ -262,7 +262,6 @@
   deletions: number; // Number of deleted lines
   total_comment_count?: number;
   unresolved_comment_count?: number;
-  // TODO(TS): Use changed_id everywhere in code instead of (legacy) _number
   _number: NumericChangeId;
   owner: AccountInfo;
   actions?: ActionNameToActionInfoMap;
@@ -1175,11 +1174,6 @@
 
 export type PathToCommentsInfoMap = {[path: string]: CommentInfo[]};
 
-export type PortedCommentsAndDrafts = {
-  portedComments?: PathToCommentsInfoMap;
-  portedDrafts?: PathToCommentsInfoMap;
-};
-
 /**
  * The CommentRange entity describes the range of an inline comment.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#comment-range
diff --git a/polygerrit-ui/app/types/events.ts b/polygerrit-ui/app/types/events.ts
index f136045..2398a66 100644
--- a/polygerrit-ui/app/types/events.ts
+++ b/polygerrit-ui/app/types/events.ts
@@ -15,10 +15,11 @@
  * limitations under the License.
  */
 import {EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
-import {PatchSetNum} from './common';
+import {PatchSetNum, UrlEncodedCommentId} from './common';
 import {UIComment} from '../utils/comment-util';
 import {Side} from '../constants/constants';
 import {LineNumber} from '../elements/diff/gr-diff/gr-diff-line';
+import {FetchRequest} from './types';
 
 export interface TitleChangeEventDetail {
   title: string;
@@ -44,6 +45,31 @@
   }
 }
 
+export interface ServerErrorEventDetail {
+  request?: FetchRequest;
+  response: Response;
+}
+
+export type ServerErrorEvent = CustomEvent<ServerErrorEventDetail>;
+
+declare global {
+  interface DocumentEventMap {
+    'server-error': ServerErrorEvent;
+  }
+}
+
+export interface NetworkErrorEventDetail {
+  error: Error;
+}
+
+export type NetworkErrorEvent = CustomEvent<NetworkErrorEventDetail>;
+
+declare global {
+  interface DocumentEventMap {
+    'network-error': NetworkErrorEvent;
+  }
+}
+
 export interface LocationChangeEventDetail {
   hash: string;
   pathname: string;
@@ -153,7 +179,8 @@
 
 declare global {
   interface HTMLElementEventMap {
-    reload: ReloadEvent;
+    /* prettier-ignore */
+    'reload': ReloadEvent;
   }
 }
 
@@ -187,3 +214,16 @@
   readonly keyCode: number;
   readonly repeat: boolean;
 }
+
+export interface ThreadListModifiedDetail {
+  rootId: UrlEncodedCommentId;
+  path: string;
+}
+
+export type ThreadListModifiedEvent = CustomEvent<ThreadListModifiedDetail>;
+
+declare global {
+  interface HTMLElementEventMap {
+    'thread-list-modified': ThreadListModifiedEvent;
+  }
+}
diff --git a/polygerrit-ui/app/types/types.ts b/polygerrit-ui/app/types/types.ts
index b40d618..232e204 100644
--- a/polygerrit-ui/app/types/types.ts
+++ b/polygerrit-ui/app/types/types.ts
@@ -27,6 +27,7 @@
   PatchSetNum,
 } from './common';
 import {PolymerSpliceChange} from '@polymer/polymer/interfaces';
+import {AuthRequestInit} from '../services/gr-auth/gr-auth';
 
 export function notUndefined<T>(x: T | undefined): x is T {
   return x !== undefined;
@@ -237,3 +238,9 @@
 >(x: T | PolymerSpliceChange<U>): x is PolymerSpliceChange<U> {
   return (x as PolymerSpliceChange<U>).indexSplices !== undefined;
 }
+
+export interface FetchRequest {
+  url: string;
+  fetchOptions?: AuthRequestInit;
+  anonymizedUrl?: string;
+}
diff --git a/polygerrit-ui/app/utils/admin-nav-util.ts b/polygerrit-ui/app/utils/admin-nav-util.ts
index 06f4e3a..b144313 100644
--- a/polygerrit-ui/app/utils/admin-nav-util.ts
+++ b/polygerrit-ui/app/utils/admin-nav-util.ts
@@ -16,7 +16,6 @@
  */
 import {
   GerritNav,
-  GerritView,
   RepoDetailView,
   GroupDetailView,
 } from '../elements/core/gr-navigation/gr-navigation';
@@ -28,6 +27,7 @@
 } from '../types/common';
 import {MenuLink} from '../elements/plugins/gr-admin-api/gr-admin-api';
 import {hasOwnProperty} from './common-util';
+import {GerritView} from '../services/router/router-model';
 
 const ADMIN_LINKS: NavLink[] = [
   {
diff --git a/polygerrit-ui/app/utils/attention-set-util.ts b/polygerrit-ui/app/utils/attention-set-util.ts
index b0aefcb..5b2762c 100644
--- a/polygerrit-ui/app/utils/attention-set-util.ts
+++ b/polygerrit-ui/app/utils/attention-set-util.ts
@@ -17,6 +17,7 @@
 
 import {AccountInfo, ChangeInfo} from '../types/common';
 import {isServiceUser} from './account-util';
+import {hasOwnProperty} from './common-util';
 
 // You would typically use a ServerInfo here, but this utility does not care
 // about all the other parameters in that object.
@@ -46,7 +47,8 @@
   return (
     isAttentionSetEnabled(config) &&
     canHaveAttention(account) &&
-    !!change?.attention_set?.hasOwnProperty(account!._account_id!)
+    !!change?.attention_set &&
+    hasOwnProperty(change?.attention_set, account!._account_id!)
   );
 }
 
diff --git a/polygerrit-ui/app/utils/comment-util.ts b/polygerrit-ui/app/utils/comment-util.ts
index c338b00..5d8ea37 100644
--- a/polygerrit-ui/app/utils/comment-util.ts
+++ b/polygerrit-ui/app/utils/comment-util.ts
@@ -22,11 +22,14 @@
   Timestamp,
   UrlEncodedCommentId,
   CommentRange,
+  PatchRange,
+  ParentPatchSetNum,
 } 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, patchNumEquals} from './patch-set-util';
 
 export interface DraftCommentProps {
   __draft?: boolean;
@@ -42,16 +45,14 @@
 export type Comment = DraftInfo | CommentInfo | RobotCommentInfo;
 
 export interface UIStateCommentProps {
-  // diffSide is used by gr-diff to decide which side(left/right) to show
-  // the comment
-  diffSide?: Side;
   collapsed?: boolean;
-  // TODO(TS): Consider allowing this only for drafts.
-  __editing?: boolean;
-  __otherEditing?: boolean;
 }
 
-export type UIDraft = DraftInfo & UIStateCommentProps;
+export interface UIStateDraftProps {
+  __editing?: boolean;
+}
+
+export type UIDraft = DraftInfo & UIStateCommentProps & UIStateDraftProps;
 
 export type UIHuman = CommentInfo & UIStateCommentProps;
 
@@ -97,7 +98,10 @@
   });
 }
 
-export function createCommentThreads(comments: UIComment[]) {
+export function createCommentThreads(
+  comments: UIComment[],
+  patchRange?: PatchRange
+) {
   const sortedComments = sortComments(comments);
   const threads: CommentThread[] = [];
   const idThreadMap: CommentIdToCommentThreadMap = {};
@@ -126,8 +130,14 @@
       line: comment.line,
       range: comment.range,
       rootId: comment.id,
-      diffSide: comment.diffSide,
     };
+    if (patchRange) {
+      if (isInBaseOfPatchRange(comment, patchRange))
+        newThread.diffSide = Side.LEFT;
+      else if (isInRevisionOfPatchRange(comment, patchRange))
+        newThread.diffSide = Side.RIGHT;
+      else throw new Error('comment does not belong in given patchrange');
+    }
     if (!comment.line && !comment.range) {
       newThread.line = 'FILE';
     }
@@ -148,6 +158,7 @@
   rootId?: UrlEncodedCommentId;
   diffSide?: Side;
   range?: CommentRange;
+  ported?: boolean; // is the comment ported over from a previous patchset
 }
 
 export function getLastComment(thread?: CommentThread): UIComment | undefined {
@@ -162,3 +173,89 @@
 export function isDraftThread(thread?: CommentThread): boolean {
   return isDraft(getLastComment(thread));
 }
+
+/**
+ * Whether the given comment should be included in the base side of the
+ * given patch range.
+ */
+export function isInBaseOfPatchRange(
+  comment: CommentBasics,
+  range: PatchRange
+) {
+  // If the base of the patch range is a parent of a merge, and the comment
+  // appears on a specific parent then only show the comment if the parent
+  // index of the comment matches that of the range.
+  if (comment.parent && comment.side === CommentSide.PARENT) {
+    return (
+      isMergeParent(range.basePatchNum) &&
+      comment.parent === getParentIndex(range.basePatchNum)
+    );
+  }
+
+  // If the base of the range is the parent of the patch:
+  if (
+    range.basePatchNum === ParentPatchSetNum &&
+    comment.side === CommentSide.PARENT &&
+    patchNumEquals(comment.patch_set, range.patchNum)
+  ) {
+    return true;
+  }
+  // If the base of the range is not the parent of the patch:
+  return (
+    range.basePatchNum !== ParentPatchSetNum &&
+    comment.side !== CommentSide.PARENT &&
+    patchNumEquals(comment.patch_set, range.basePatchNum)
+  );
+}
+
+/**
+ * Whether the given comment should be included in the revision side of the
+ * given patch range.
+ */
+export function isInRevisionOfPatchRange(
+  comment: CommentBasics,
+  range: PatchRange
+) {
+  return (
+    comment.side !== CommentSide.PARENT &&
+    patchNumEquals(comment.patch_set, range.patchNum)
+  );
+}
+
+/**
+ * Whether the given comment should be included in the given patch range.
+ */
+export function isInPatchRange(
+  comment: CommentBasics,
+  range: PatchRange
+): boolean {
+  return (
+    isInBaseOfPatchRange(comment, range) ||
+    isInRevisionOfPatchRange(comment, range)
+  );
+}
+
+export function getPatchRangeForCommentUrl(
+  comment: UIComment,
+  latestPatchNum: PatchSetNum
+) {
+  if (!comment.patch_set) throw new Error('Missing comment.patch_set');
+
+  // TODO(dhruvsri): Add handling for comment left on parents of merge commits
+  if (comment.side === CommentSide.PARENT) {
+    return {
+      patchNum: comment.patch_set,
+      basePatchNum: ParentPatchSetNum,
+    };
+  } else if (patchNumEquals(latestPatchNum, comment.patch_set)) {
+    return {
+      patchNum: latestPatchNum,
+      basePatchNum: ParentPatchSetNum,
+    };
+  } else {
+    return {
+      patchNum: latestPatchNum,
+      basePatchNum: comment.patch_set,
+    };
+  }
+}
diff --git a/polygerrit-ui/app/utils/comment-util_test.js b/polygerrit-ui/app/utils/comment-util_test.js
index ad19974..3b1c090 100644
--- a/polygerrit-ui/app/utils/comment-util_test.js
+++ b/polygerrit-ui/app/utils/comment-util_test.js
@@ -17,8 +17,11 @@
 
 import '../test/common-test-setup-karma.js';
 import {
-  isUnresolved,
+  isUnresolved, getPatchRangeForCommentUrl,
 } from './comment-util.js';
+import {createComment} from '../test/test-data-generators.js';
+import {CommentSide} from '../constants/constants.js';
+import {ParentPatchSetNum} from '../types/common.js';
 
 suite('comment-util', () => {
   test('isUnresolved', () => {
@@ -31,4 +34,22 @@
     assert.isFalse(isUnresolved(
         {comments: [{unresolved: true}, {unresolved: false}]}));
   });
+
+  test('getPatchRangeForCommentUrl', () => {
+    test('comment created with side=PARENT does not navigate to latest ps',
+        () => {
+          const comment = {
+            ...createComment(),
+            id: 'c4',
+            line: 10,
+            patch_set: 4,
+            side: CommentSide.PARENT,
+            path: '/COMMIT_MSG',
+          };
+          assert.deepEqual(getPatchRangeForCommentUrl(comment, 11), {
+            basePatchNum: ParentPatchSetNum,
+            patchNum: 4,
+          });
+        });
+  });
 });
diff --git a/polygerrit-ui/app/utils/event-util.ts b/polygerrit-ui/app/utils/event-util.ts
index 0af8fe2..5e1ff44 100644
--- a/polygerrit-ui/app/utils/event-util.ts
+++ b/polygerrit-ui/app/utils/event-util.ts
@@ -15,10 +15,25 @@
  * limitations under the License.
  */
 
+import {UrlEncodedCommentId} from '../types/common';
+import {FetchRequest} from '../types/types';
+
 export enum EventType {
   SHOW_ALERT = 'show-alert',
   PAGE_ERROR = 'page-error',
+  SERVER_ERROR = 'server-error',
+  NETWORK_ERROR = 'network-error',
   TITLE_CHANGE = 'title-change',
+  THREAD_LIST_MODIFIED = 'thread-list-modified',
+}
+
+export function fireEvent(target: EventTarget, type: string) {
+  target.dispatchEvent(
+    new CustomEvent(type, {
+      composed: true,
+      bubbles: true,
+    })
+  );
 }
 
 export function fireAlert(target: EventTarget, message: string) {
@@ -41,6 +56,26 @@
   );
 }
 
+export function fireServerError(response: Response, request?: FetchRequest) {
+  document.dispatchEvent(
+    new CustomEvent(EventType.SERVER_ERROR, {
+      detail: {response, request},
+      composed: true,
+      bubbles: true,
+    })
+  );
+}
+
+export function fireNetworkError(error: Error) {
+  document.dispatchEvent(
+    new CustomEvent(EventType.NETWORK_ERROR, {
+      detail: {error},
+      composed: true,
+      bubbles: true,
+    })
+  );
+}
+
 export function fireTitleChange(target: EventTarget, title: string) {
   target.dispatchEvent(
     new CustomEvent(EventType.TITLE_CHANGE, {
@@ -50,3 +85,17 @@
     })
   );
 }
+
+export function fireThreadListModifiedEvent(
+  target: EventTarget,
+  rootId: UrlEncodedCommentId,
+  path: string
+) {
+  target.dispatchEvent(
+    new CustomEvent(EventType.THREAD_LIST_MODIFIED, {
+      detail: {rootId, path},
+      composed: true,
+      bubbles: true,
+    })
+  );
+}
diff --git a/polygerrit-ui/app/utils/label-util.ts b/polygerrit-ui/app/utils/label-util.ts
index 4313745..fc83d77 100644
--- a/polygerrit-ui/app/utils/label-util.ts
+++ b/polygerrit-ui/app/utils/label-util.ts
@@ -15,7 +15,9 @@
  * limitations under the License.
  */
 import {
+  AccountInfo,
   ApprovalInfo,
+  DetailedLabelInfo,
   isDetailedLabelInfo,
   LabelInfo,
   VotingRangeInfo,
@@ -42,3 +44,10 @@
   const votingRange = getVotingRangeOrDefault(label);
   return label.all.filter(account => account.value === votingRange.max);
 }
+
+export function getApprovalInfo(
+  label: DetailedLabelInfo,
+  account: AccountInfo
+): ApprovalInfo | undefined {
+  return label.all?.filter(x => x._account_id === account._account_id)[0];
+}
diff --git a/polygerrit-ui/app/utils/label-util_test.js b/polygerrit-ui/app/utils/label-util_test.js
index d6f7b3e..6a2f768 100644
--- a/polygerrit-ui/app/utils/label-util_test.js
+++ b/polygerrit-ui/app/utils/label-util_test.js
@@ -20,6 +20,7 @@
   getVotingRange,
   getVotingRangeOrDefault,
   getMaxAccounts,
+  getApprovalInfo,
 } from './label-util.js';
 
 const VALUES_1 = {
@@ -87,4 +88,29 @@
     assert.isEmpty(getMaxAccounts({}));
     assert.isEmpty(getMaxAccounts({values: VALUES_2}));
   });
+
+  test('getApprovalInfo', () => {
+    const myAccountInfo = {_account_id: 314};
+    const myApprovalInfo = {value: 2, _account_id: 314};
+    const label = {
+      values: VALUES_2,
+      all: [myApprovalInfo, {value: 1, _account_id: 777}],
+    };
+    assert.equal(
+        getApprovalInfo(label, myAccountInfo),
+        myApprovalInfo
+    );
+  });
+
+  test('getApprovalInfo no approval for user', () => {
+    const myAccountInfo = {_account_id: 123};
+    const label = {
+      values: VALUES_2,
+      all: [
+        {value: 2, _account_id: 314},
+        {value: 1, _account_id: 777},
+      ],
+    };
+    assert.isUndefined(getApprovalInfo(label, myAccountInfo));
+  });
 });
diff --git a/polygerrit-ui/app/utils/patch-set-util.ts b/polygerrit-ui/app/utils/patch-set-util.ts
index d063168..fda302b 100644
--- a/polygerrit-ui/app/utils/patch-set-util.ts
+++ b/polygerrit-ui/app/utils/patch-set-util.ts
@@ -198,11 +198,9 @@
  *     above
  */
 export function computeAllPatchSets(
-  change: ChangeInfo | ParsedChangeInfo
+  change: ChangeInfo | ParsedChangeInfo | undefined
 ): PatchSet[] {
-  if (!change) {
-    return [];
-  }
+  if (!change) return [];
 
   let patchNums: PatchSet[] = [];
   if (change.revisions && Object.keys(change.revisions).length) {
diff --git a/polygerrit-ui/app/utils/string-util.ts b/polygerrit-ui/app/utils/string-util.ts
new file mode 100644
index 0000000..36050ca
--- /dev/null
+++ b/polygerrit-ui/app/utils/string-util.ts
@@ -0,0 +1,24 @@
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Returns a count plus string that is pluralized when necessary.
+ */
+export function pluralize(count: number, noun: string): string {
+  if (count === 0) return '';
+  return `${count} ${noun}` + (count > 1 ? 's' : '');
+}
diff --git a/polygerrit-ui/app/utils/string-util_test.ts b/polygerrit-ui/app/utils/string-util_test.ts
new file mode 100644
index 0000000..9297d90
--- /dev/null
+++ b/polygerrit-ui/app/utils/string-util_test.ts
@@ -0,0 +1,28 @@
+/**
+ * @license
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import '../test/common-test-setup-karma.js';
+import {pluralize} from './string-util.js';
+
+suite('formatter util tests', () => {
+  test('pluralize', () => {
+    const noun = 'comment';
+    assert.equal(pluralize(0, noun), '');
+    assert.equal(pluralize(1, noun), '1 comment');
+    assert.equal(pluralize(2, noun), '2 comments');
+  });
+});
diff --git a/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy b/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
index 000f4e2..31ea7d2 100644
--- a/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
+++ b/resources/com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy
@@ -171,5 +171,5 @@
 
   // Load gr-app.js after <gr-app ...> tag because gr-router expects that
   // <gr-app ...> already exists in the document when script is executed.
-  <script src="{$staticResourcePath}/elements/gr-app.js"></script>{\n}
+  <script src="{$staticResourcePath}/elements/gr-app.js" crossorigin="anonymous"></script>{\n}
 {/template}
diff --git a/tools/bzl/maven_jar.bzl b/tools/bzl/maven_jar.bzl
index 9908ee8..15b1797 100644
--- a/tools/bzl/maven_jar.bzl
+++ b/tools/bzl/maven_jar.bzl
@@ -126,18 +126,6 @@
 """.format(srcjar = srcjar)
     ctx.file("%s/BUILD" % ctx.path("jar"), contents, False)
 
-    # Compatibility layer for java_import_external from rules_closure
-    contents = """
-{header}
-package(default_visibility = ['//visibility:public'])
-
-alias(
-    name = "{rule_name}",
-    actual = "@{rule_name}//jar",
-)
-\n""".format(rule_name = ctx.name, header = header)
-    ctx.file("BUILD", contents, False)
-
 def _maven_jar_impl(ctx):
     """rule to download a Maven archive."""
     coordinates = _create_coordinates(ctx.attr.artifact)
diff --git a/tools/coverage.sh b/tools/coverage.sh
index c92d5cf..3582d22 100755
--- a/tools/coverage.sh
+++ b/tools/coverage.sh
@@ -33,15 +33,24 @@
 cp -r {java,javatests}/* ${destdir}/java
 
 mkdir -p ${destdir}/plugins
-for plugin in `find plugins/ -maxdepth 1 -type d`
+for plugin in `find plugins/ -mindepth 1 -maxdepth 1 -type d`
 do
   mkdir -p ${destdir}/${plugin}/java
-  cp -r plugins/*/{java,javatests}/* ${destdir}/${plugin}/java
+  if [ -e ${plugin}/java/ ]
+    then cp -r ${plugin}/java/* ${destdir}/${plugin}/java
+  fi
+  if [ -e ${plugin}/javatests/ ]
+    then cp -r ${plugin}/javatests/* ${destdir}/${plugin}/java
+  fi
 
   # for backwards compatibility support plugins with old file structure
   mkdir -p ${destdir}/${plugin}/src/{main,test}/java
-  cp -r plugins/*/src/main/java/* ${destdir}/${plugin}/src/main/java
-  cp -r plugins/*/src/test/java/* ${destdir}/${plugin}/src/test/java
+  if [ -e ${plugin}/src/main/java/ ]
+    then cp -r ${plugin}/src/main/java/* ${destdir}/${plugin}/src/main/java/
+  fi
+  if [ -e ${plugin}/src/test/java/ ]
+    then cp -r ${plugin}/src/test/java/* ${destdir}/${plugin}/src/test/java/
+  fi
 done
 
 base=$(bazel info bazel-testlogs)
diff --git a/tools/js/BUILD b/tools/js/BUILD
index fedaf7f..1a272e2 100644
--- a/tools/js/BUILD
+++ b/tools/js/BUILD
@@ -1 +1 @@
-exports_files(["run_npm_binary.py"])
+exports_files(["run_npm_binary.py", "eslint-chdir.js"])
diff --git a/tools/js/eslint-chdir.js b/tools/js/eslint-chdir.js
new file mode 100644
index 0000000..5aea704
--- /dev/null
+++ b/tools/js/eslint-chdir.js
@@ -0,0 +1,30 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Eslint 7 introduced a breaking change - it uses the current workdir instead
+// of the configuration file directory for resolving relative paths:
+// https://eslint.org/docs/user-guide/migrating-to-7.0.0#base-path-change
+// This file is loaded before the eslint and sets the current directory
+// back to the location of configuration file.
+
+const path = require('path');
+const configParamIndex =
+    process.argv.findIndex(arg => arg === '-c' || arg === '---config');
+if (configParamIndex >= 0 && configParamIndex + 1 < process.argv.length) {
+  const dirName = path.dirname(process.argv[configParamIndex + 1]);
+  process.chdir(dirName);
+}
diff --git a/tools/js/eslint.bzl b/tools/js/eslint.bzl
index 586b1c5..b32e2bc 100644
--- a/tools/js/eslint.bzl
+++ b/tools/js/eslint.bzl
@@ -57,9 +57,11 @@
         config,
         ignore,
         "//tools/js/eslint-rules:eslint-rules-srcs",
+        "//tools/js:eslint-chdir.js",
         eslint_rules_toplevel_file,
     ] + plugins + data
     common_templated_args = [
+        "--node_options=--require=$$(rlocation $(rootpath //tools/js:eslint-chdir.js))",
         "--ext",
         ",".join(extensions),
         "-c",
@@ -85,7 +87,7 @@
             "*_test_require_patch.js",
             "--ignore-pattern",
             "*_test_loader.js",
-            native.package_name(),
+            "./", # Relative to the config file location
         ],
         # Should not run sandboxed.
         tags = [
diff --git a/tools/maven/gerrit-acceptance-framework_pom.xml b/tools/maven/gerrit-acceptance-framework_pom.xml
index 970a4a9..f6d1e3b 100644
--- a/tools/maven/gerrit-acceptance-framework_pom.xml
+++ b/tools/maven/gerrit-acceptance-framework_pom.xml
@@ -47,6 +47,9 @@
       <name>Joerg Zieren</name>
     </developer>
     <developer>
+      <name>Jacek Centkowski</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
diff --git a/tools/maven/gerrit-extension-api_pom.xml b/tools/maven/gerrit-extension-api_pom.xml
index 74c4769..daf8089 100644
--- a/tools/maven/gerrit-extension-api_pom.xml
+++ b/tools/maven/gerrit-extension-api_pom.xml
@@ -47,6 +47,9 @@
       <name>Joerg Zieren</name>
     </developer>
     <developer>
+      <name>Jacek Centkowski</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
diff --git a/tools/maven/gerrit-plugin-api_pom.xml b/tools/maven/gerrit-plugin-api_pom.xml
index e8fae82..07895a4 100644
--- a/tools/maven/gerrit-plugin-api_pom.xml
+++ b/tools/maven/gerrit-plugin-api_pom.xml
@@ -47,6 +47,9 @@
       <name>Joerg Zieren</name>
     </developer>
     <developer>
+      <name>Jacek Centkowski</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
diff --git a/tools/maven/gerrit-war_pom.xml b/tools/maven/gerrit-war_pom.xml
index be6688a..a28adea 100644
--- a/tools/maven/gerrit-war_pom.xml
+++ b/tools/maven/gerrit-war_pom.xml
@@ -47,6 +47,9 @@
       <name>Joerg Zieren</name>
     </developer>
     <developer>
+      <name>Jacek Centkowski</name>
+    </developer>
+    <developer>
       <name>Luca Milanesio</name>
     </developer>
     <developer>
diff --git a/tools/node_tools/node_modules_licenses/tsconfig.json b/tools/node_tools/node_modules_licenses/tsconfig.json
index 2046c394..cb7bb60 100644
--- a/tools/node_tools/node_modules_licenses/tsconfig.json
+++ b/tools/node_tools/node_modules_licenses/tsconfig.json
@@ -1,5 +1,13 @@
 {
   "compilerOptions": {
+    "plugins": [
+      {
+        "name": "@bazel/tsetse",
+        "disabledRules": [
+          "must-type-assert-json-parse"
+        ]
+      }
+    ],
     "target": "es6",
     "module": "commonjs",
     "allowSyntheticDefaultImports": true,
diff --git a/tools/node_tools/package.json b/tools/node_tools/package.json
index 36a10d3..fdada50 100644
--- a/tools/node_tools/package.json
+++ b/tools/node_tools/package.json
@@ -3,8 +3,8 @@
   "description": "Gerrit Build Tools",
   "browser": false,
   "dependencies": {
-    "@bazel/rollup": "^2.2.2",
-    "@bazel/typescript": "^2.2.2",
+    "@bazel/rollup": "^3.0.0-rc.1",
+    "@bazel/typescript": "^3.0.0-rc.1",
     "@types/node": "^10.17.12",
     "@types/parse5": "^4.0.0",
     "@types/parse5-html-rewriting-stream": "^5.1.2",
@@ -13,10 +13,10 @@
     "parse5-html-rewriting-stream": "^5.1.1",
     "polymer-bundler": "^4.0.10",
     "polymer-cli": "^1.9.11",
-    "rollup": "^1.27.5",
+    "rollup": "^2.3.4",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-terser": "^5.1.3",
-    "typescript": "3.9.5"
+    "typescript": "4.0.5"
   },
   "devDependencies": {},
   "license": "Apache-2.0",
diff --git a/tools/node_tools/yarn.lock b/tools/node_tools/yarn.lock
index 988deb7..338e490 100644
--- a/tools/node_tools/yarn.lock
+++ b/tools/node_tools/yarn.lock
@@ -492,15 +492,15 @@
     lodash "^4.17.13"
     to-fast-properties "^2.0.0"
 
-"@bazel/rollup@^2.2.2":
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/@bazel/rollup/-/rollup-2.2.2.tgz#1abfc5cbf5eb65db2aa145e584d225684d961055"
-  integrity sha512-z3sK0dt7pftjxlLuo66e3PMMGyjq6vD/8B+OEFN3LD3GjE34e8X0/KeRX5lXWs1ecVlrnTroiBxLCJSHwqBrEA==
+"@bazel/rollup@^3.0.0-rc.1":
+  version "3.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/@bazel/rollup/-/rollup-3.0.0-rc.1.tgz#153fb7ca556dfb0397aa3a86cbef71bcefb00733"
+  integrity sha512-O2WGfDw17aiQfUF6t5aL1kbVGeR6BnCImmtCOoFf1I8/Nw0dx+iE9x2qfqPyvSivZRuL2EBTI+xUcti42bpWgA==
 
-"@bazel/typescript@^2.2.2":
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/@bazel/typescript/-/typescript-2.2.2.tgz#c7cd49cb630ca3720c04c94046ba8ca4c0d5b0aa"
-  integrity sha512-hkx/7L3s8q5gIgaSFmkUZWPqdKmdJmQ04GaLnsI/YEp9EhPObqATSKnOHeDdT7bzqLO7giDAwAiXhEmsO1Smcw==
+"@bazel/typescript@^3.0.0-rc.1":
+  version "3.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/@bazel/typescript/-/typescript-3.0.0-rc.1.tgz#4a80682124475db63abc97b7da358caaadbd3077"
+  integrity sha512-KaGaCEbXjCKaRuwH/hLjW7aBuNyU8p/9yUe4KlP4KKoRqHAmjYISbUOw7VAksOW6BxXHgknOcZYaVF6PzE4CgQ==
   dependencies:
     protobufjs "6.8.8"
     semver "5.6.0"
@@ -3732,6 +3732,11 @@
     bindings "^1.5.0"
     nan "^2.12.1"
 
+fsevents@~2.1.2:
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.1.3.tgz#fb738703ae8d2f9fe900c33836ddebee8b97f23e"
+  integrity sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==
+
 function-bind@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
@@ -6827,7 +6832,7 @@
   dependencies:
     estree-walker "^0.6.1"
 
-rollup@^1.27.5, rollup@^1.3.0:
+rollup@^1.3.0:
   version "1.30.0"
   resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.30.0.tgz#ae9c893804e8eaa8f8f74b0aaf7e7fb4374a9d01"
   integrity sha512-ANcmfaSQwpcJtZUTA0ZMNBtFcQ1B4A5FldlNqEK0WdWm9sHSKu93ffa2KV1ux8HA/yKIV/ZARV28m7rNdXJgEw==
@@ -6836,6 +6841,13 @@
     "@types/node" "*"
     acorn "^7.1.0"
 
+rollup@^2.3.4:
+  version "2.35.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.35.1.tgz#e6bc8d10893556a638066f89e8c97f422d03968c"
+  integrity sha512-q5KxEyWpprAIcainhVy6HfRttD9kutQpHbeqDTWnqAFNJotiojetK6uqmcydNMymBEtC4I8bCYR+J3mTMqeaUA==
+  optionalDependencies:
+    fsevents "~2.1.2"
+
 run-async@^2.0.0, run-async@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/run-async/-/run-async-2.3.0.tgz#0371ab4ae0bdd720d4166d7dfda64ff7a445a6c0"
@@ -7881,10 +7893,10 @@
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@3.9.5:
-  version "3.9.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.5.tgz#586f0dba300cde8be52dd1ac4f7e1009c1b13f36"
-  integrity sha512-hSAifV3k+i6lEoCJ2k6R2Z/rp/H3+8sdmcn5NrS3/3kE7+RyZXm9aqvxWqjEXHAd8b0pShatpcdMTvEdvAJltQ==
+typescript@4.0.5:
+  version "4.0.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.5.tgz#ae9dddfd1069f1cb5beb3ef3b2170dd7c1332389"
+  integrity sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==
 
 typical@^2.6.0, typical@^2.6.1:
   version "2.6.1"
diff --git a/tools/nongoogle.bzl b/tools/nongoogle.bzl
index 4c65588..4279183 100644
--- a/tools/nongoogle.bzl
+++ b/tools/nongoogle.bzl
@@ -1,4 +1,5 @@
 load("//tools/bzl:maven_jar.bzl", "maven_jar")
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_file")
 
 GUAVA_VERSION = "29.0-jre"
 GUAVA_BIN_SHA1 = "801142b4c3d0f0770dd29abea50906cacfddd447"
@@ -97,7 +98,8 @@
     )
 
     # When upgrading elasticsearch-rest-client, also upgrade httpcore-nio
-    # and httpasyncclient as necessary.
+    # and httpasyncclient as necessary. Consider also the other
+    # org.apache.httpcomponents dependencies in ../WORKSPACE.
     maven_jar(
         name = "elasticsearch-rest-client",
         artifact = "org.elasticsearch.client:elasticsearch-rest-client:7.8.1",
@@ -106,8 +108,14 @@
 
     maven_jar(
         name = "jackson-core",
-        artifact = "com.fasterxml.jackson.core:jackson-core:2.11.3",
-        sha1 = "c2351800432bdbdd8284c3f5a7f0782a352aa84a",
+        artifact = "com.fasterxml.jackson.core:jackson-core:2.12.0",
+        sha1 = "afe52c6947d9939170da7989612cef544115511a",
+    )
+
+    maven_jar(
+        name = "commons-io",
+        artifact = "commons-io:commons-io:2.4",
+        sha1 = "b1b6ea3b7e4aa4f492509a4952029cd8e48019ad",
     )
 
     # Google internal dependencies: these are developed at Google, so there is
@@ -139,6 +147,36 @@
         sha1 = GUAVA_BIN_SHA1,
     )
 
+    GUICE_VERS = "4.2.3"
+
+    GUICE_LIBRARY_SHA256 = "5168f5e7383f978c1b4154ac777b78edd8ac214bb9f9afdb92921c8d156483d3"
+
+    http_file(
+        name = "guice-library-no-aop",
+        canonical_id = "guice-library-no-aop-" + GUICE_VERS + ".jar-" + GUICE_LIBRARY_SHA256,
+        downloaded_file_path = "guice-library-no-aop.jar",
+        sha256 = GUICE_LIBRARY_SHA256,
+        urls = [
+            "https://repo1.maven.org/maven2/com/google/inject/guice/" +
+            GUICE_VERS +
+            "/guice-" +
+            GUICE_VERS +
+            "-no_aop.jar",
+        ],
+    )
+
+    maven_jar(
+        name = "guice-assistedinject",
+        artifact = "com.google.inject.extensions:guice-assistedinject:" + GUICE_VERS,
+        sha1 = "acbfddc556ee9496293ed1df250cc378f331d854",
+    )
+
+    maven_jar(
+        name = "guice-servlet",
+        artifact = "com.google.inject.extensions:guice-servlet:" + GUICE_VERS,
+        sha1 = "8d6e7e35eac4fb5e7df19c55b3bc23fa51b10a11",
+    )
+
     # Test-only dependencies below.
 
     maven_jar(
@@ -153,21 +191,21 @@
         sha1 = "dc13ae4faca6df981fc7aeb5a522d9db446d5d50",
     )
 
-    DOCKER_JAVA_VERS = "3.2.5"
+    DOCKER_JAVA_VERS = "3.2.7"
 
     maven_jar(
         name = "docker-java-api",
         artifact = "com.github.docker-java:docker-java-api:" + DOCKER_JAVA_VERS,
-        sha1 = "8fe5c5e39f940ce58620e77cedc0a2a52d76f9d8",
+        sha1 = "81408fc988c229ea11354fee9902c47842343f04",
     )
 
     maven_jar(
         name = "docker-java-transport",
         artifact = "com.github.docker-java:docker-java-transport:" + DOCKER_JAVA_VERS,
-        sha1 = "27af0ee7ebc2f5672e23ea64769497b5d55ce3ac",
+        sha1 = "315903a129f530422747efc163dd255f0fa2555e",
     )
 
-    # https://github.com/docker-java/docker-java/blob/3.2.5/pom.xml#L61
+    # https://github.com/docker-java/docker-java/blob/3.2.7/pom.xml#L61
     # <=> DOCKER_JAVA_VERS
     maven_jar(
         name = "jackson-annotations",
@@ -175,18 +213,18 @@
         sha1 = "0f63b3b1da563767d04d2e4d3fc1ae0cdeffebe7",
     )
 
-    TESTCONTAINERS_VERSION = "1.15.0"
+    TESTCONTAINERS_VERSION = "1.15.1"
 
     maven_jar(
         name = "testcontainers",
         artifact = "org.testcontainers:testcontainers:" + TESTCONTAINERS_VERSION,
-        sha1 = "b627535b444d88e7b14953bb953d80d9b7b3bd76",
+        sha1 = "91e6dfab8f141f77c6a0dd147a94bd186993a22c",
     )
 
     maven_jar(
         name = "testcontainers-elasticsearch",
         artifact = "org.testcontainers:elasticsearch:" + TESTCONTAINERS_VERSION,
-        sha1 = "2bd79fd915e5c7bcf9b5d86cd8e0b7a0fff4b8ce",
+        sha1 = "6b778a270b7529fcb9b7a6f62f3ae9d38544ce2f",
     )
 
     maven_jar(
diff --git a/tools/remote-bazelrc b/tools/remote-bazelrc
index 13c498e..0aeb8d5 100644
--- a/tools/remote-bazelrc
+++ b/tools/remote-bazelrc
@@ -30,36 +30,20 @@
 
 # Set several flags related to specifying the platform, toolchain and java
 # properties.
-# These flags are duplicated rather than imported from (for example)
-# %workspace%/configs/ubuntu16_04_clang/1.2/toolchain.bazelrc to make this
-# bazelrc a standalone file that can be copied more easily.
-# These flags should only be used as is for the rbe-ubuntu16-04 container
-# and need to be adapted to work with other toolchain containers.
-build:remote --host_javabase=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:jdk8
-build:remote --javabase=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:jdk8
-build:remote --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8
-build:remote --java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8
-build:remote --crosstool_top=@bazel_toolchains//configs/ubuntu16_04_clang/1.2/bazel_0.25.0/default:toolchain
+build:remote --host_javabase=@rbe_jdk11//java:jdk
+build:remote --javabase=@rbe_jdk11//java:jdk
+build:remote --crosstool_top=@rbe_jdk11//cc:toolchain
+build:remote --extra_toolchains=@rbe_jdk11//config:cc-toolchain
+build:remote --extra_execution_platforms=@rbe_jdk11//config:platform
+build:remote --host_platform=@rbe_jdk11//config:platform
+build:remote --platforms=@rbe_jdk11//config:platform
 build:remote --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
-# Platform flags:
-# The toolchain container used for execution is defined in the target indicated
-# by "extra_execution_platforms", "host_platform" and "platforms".
-# If you are using your own toolchain container, you need to create a platform
-# target with "constraint_values" that allow for the toolchain specified with
-# "extra_toolchains" to be selected (given constraints defined in
-# "exec_compatible_with").
-# More about platforms: https://docs.bazel.build/versions/master/platforms.html
-build:remote --extra_toolchains=@bazel_toolchains//configs/ubuntu16_04_clang/1.2/bazel_0.25.0/cpp:cc-toolchain-clang-x86_64-default
-build:remote --extra_execution_platforms=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:rbe_ubuntu1604
-build:remote --host_platform=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:rbe_ubuntu1604
-build:remote --platforms=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:rbe_ubuntu1604
 
 # Set various strategies so that all actions execute remotely. Mixing remote
 # and local execution will lead to errors unless the toolchain and remote
 # machine exactly match the host machine.
 build:remote --spawn_strategy=remote,sandboxed
 build:remote --strategy=Javac=remote
-build:remote --strategy=Closure=remote
 build:remote --strategy=Genrule=remote
 build:remote --define=EXECUTOR=remote
 
@@ -78,20 +62,6 @@
 # account credential instead.
 build:remote --auth_enabled=true
 
-# The following flags are only necessary for local docker sandboxing
-# with the rbe-ubuntu16-04 container. Use of these flags is still experimental.
-build:docker-sandbox --host_javabase=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:jdk8
-build:docker-sandbox --javabase=@bazel_toolchains//configs/ubuntu16_04_clang/1.2:jdk8
-build:docker-sandbox --crosstool_top=@bazel_toolchains//configs/ubuntu16_04_clang/1.2/bazel_0.25.0/default:toolchain
-build:docker-sandbox --experimental_docker_image=gcr.io/cloud-marketplace/google/rbe-ubuntu16-04@sha256:da0f21c71abce3bbb92c3a0c44c3737f007a82b60f8bd2930abc55fe64fc2729
-build:docker-sandbox --spawn_strategy=docker
-build:docker-sandbox --strategy=Javac=docker
-build:docker-sandbox --strategy=Closure=docker
-build:docker-sandbox --strategy=Genrule=docker
-build:docker-sandbox --define=EXECUTOR=remote
-build:docker-sandbox --experimental_docker_verbose
-build:docker-sandbox --experimental_enable_docker_sandbox
-
 # The following flags enable the remote cache so action results can be shared
 # across machines, developers, and workspaces.
 build:remote-cache --remote_cache=remotebuildexecution.googleapis.com
@@ -100,5 +70,4 @@
 build:remote-cache --auth_enabled=true
 build:remote-cache --spawn_strategy=standalone
 build:remote-cache --strategy=Javac=standalone
-build:remote-cache --strategy=Closure=standalone
 build:remote-cache --strategy=Genrule=standalone
diff --git a/yarn.lock b/yarn.lock
index 34f761f..3653ee5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -485,26 +485,42 @@
     lodash "^4.17.11"
     to-fast-properties "^2.0.0"
 
-"@bazel/rollup@^2.2.2":
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/@bazel/rollup/-/rollup-2.2.2.tgz#1abfc5cbf5eb65db2aa145e584d225684d961055"
-  integrity sha512-z3sK0dt7pftjxlLuo66e3PMMGyjq6vD/8B+OEFN3LD3GjE34e8X0/KeRX5lXWs1ecVlrnTroiBxLCJSHwqBrEA==
+"@bazel/rollup@^3.0.0-rc.1":
+  version "3.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/@bazel/rollup/-/rollup-3.0.0-rc.1.tgz#153fb7ca556dfb0397aa3a86cbef71bcefb00733"
+  integrity sha512-O2WGfDw17aiQfUF6t5aL1kbVGeR6BnCImmtCOoFf1I8/Nw0dx+iE9x2qfqPyvSivZRuL2EBTI+xUcti42bpWgA==
 
-"@bazel/terser@^2.2.2":
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/@bazel/terser/-/terser-2.2.2.tgz#2a72b739de8a12ab9ca1cfe60c6c118215acc10f"
-  integrity sha512-pPhNr21g8PN0jGhzQHOIL9pOicMgU1Jfrh+liI4PVBfSFrJbTjJw3iNRDX0skYAlsR0WG433kn8CkEjY4IvJVw==
+"@bazel/terser@^3.0.0-rc.1":
+  version "3.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/@bazel/terser/-/terser-3.0.0-rc.1.tgz#62398c1702d3eecbc41764c9ef24a6a232abb1b3"
+  integrity sha512-iaJTYl/oUBqLFG6MFYODwqBWGTshFFdVCClTmpZwdnwnAkcGf7kU1noX2vz3VcwOOHoJseBG/dhluvRmFerJ3g==
 
-"@bazel/typescript@^2.2.2":
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/@bazel/typescript/-/typescript-2.2.2.tgz#c7cd49cb630ca3720c04c94046ba8ca4c0d5b0aa"
-  integrity sha512-hkx/7L3s8q5gIgaSFmkUZWPqdKmdJmQ04GaLnsI/YEp9EhPObqATSKnOHeDdT7bzqLO7giDAwAiXhEmsO1Smcw==
+"@bazel/typescript@^3.0.0-rc.1":
+  version "3.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/@bazel/typescript/-/typescript-3.0.0-rc.1.tgz#4a80682124475db63abc97b7da358caaadbd3077"
+  integrity sha512-KaGaCEbXjCKaRuwH/hLjW7aBuNyU8p/9yUe4KlP4KKoRqHAmjYISbUOw7VAksOW6BxXHgknOcZYaVF6PzE4CgQ==
   dependencies:
     protobufjs "6.8.8"
     semver "5.6.0"
     source-map-support "0.5.9"
     tsutils "2.27.2"
 
+"@eslint/eslintrc@^0.2.2":
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-0.2.2.tgz#d01fc791e2fc33e88a29d6f3dc7e93d0cd784b76"
+  integrity sha512-EfB5OHNYp1F4px/LI/FEnGylop7nOqkQ1LRzCM0KccA2U8tvV8w01KBv37LbO7nW4H+YhKyo2LcJhRwjjV17QQ==
+  dependencies:
+    ajv "^6.12.4"
+    debug "^4.1.1"
+    espree "^7.3.0"
+    globals "^12.1.0"
+    ignore "^4.0.6"
+    import-fresh "^3.2.1"
+    js-yaml "^3.13.1"
+    lodash "^4.17.19"
+    minimatch "^3.0.4"
+    strip-json-comments "^3.1.1"
+
 "@mrmlnc/readdir-enhanced@^2.2.1":
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz#524af240d1a360527b730475ecfa1344aa540dde"
@@ -513,11 +529,32 @@
     call-me-maybe "^1.0.1"
     glob-to-regexp "^0.3.0"
 
+"@nodelib/fs.scandir@2.1.3":
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz#3a582bdb53804c6ba6d146579c46e52130cf4a3b"
+  integrity sha512-eGmwYQn3gxo4r7jdQnkrrN6bY478C3P+a/y72IJukF8LjB6ZHeB3c+Ehacj3sYeSmUXGlnA67/PmbM9CVwL7Dw==
+  dependencies:
+    "@nodelib/fs.stat" "2.0.3"
+    run-parallel "^1.1.9"
+
+"@nodelib/fs.stat@2.0.3", "@nodelib/fs.stat@^2.0.2":
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.3.tgz#34dc5f4cabbc720f4e60f75a747e7ecd6c175bd3"
+  integrity sha512-bQBFruR2TAwoevBEd/NWMoAAtNGzTRgdrqnYCc7dhzfoNvqPzLyqlEQnzZ3kVnNrSp25iyxE00/3h2fqGAGArA==
+
 "@nodelib/fs.stat@^1.1.2":
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz#2b5a3ab3f918cca48a8c754c08168e3f03eba61b"
   integrity sha512-shAmDyaQC4H92APFoIaVDHCx5bStIocgvbwQyxPRrbUY20V1EYTbSDchWbuwlMG3V17cprZhA6+78JfB+3DTPw==
 
+"@nodelib/fs.walk@^1.2.3":
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.walk/-/fs.walk-1.2.4.tgz#011b9202a70a6366e436ca5c065844528ab04976"
+  integrity sha512-1V9XOY4rDW0rehzbrcqAmHnz8e7SKvX27gh8Gt2WgB0+pdzdiLV83p72kZPU+jvMbS1qU5mauP2iOvO8rhmurQ==
+  dependencies:
+    "@nodelib/fs.scandir" "2.1.3"
+    fastq "^1.6.0"
+
 "@octokit/endpoint@^5.1.0":
   version "5.2.1"
   resolved "https://registry.yarnpkg.com/@octokit/endpoint/-/endpoint-5.2.1.tgz#e5ef98bc4a41fad62b17e71af1a1710f6076b8df"
@@ -769,11 +806,6 @@
   resolved "https://registry.yarnpkg.com/@types/escape-html/-/escape-html-0.0.20.tgz#cae698714dd61ebee5ab3f2aeb9a34ba1011735a"
   integrity sha512-6dhZJLbA7aOwkYB2GDGdIqJ20wmHnkDzaxV9PJXe7O02I2dSFTERzRB6JrX6cWKaS+VqhhY7cQUMCbO5kloFUw==
 
-"@types/eslint-visitor-keys@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
-  integrity sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==
-
 "@types/estree@0.0.39":
   version "0.0.39"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
@@ -884,6 +916,11 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.5.tgz#dcce4430e64b443ba8945f0290fb564ad5bac6dd"
   integrity sha512-7+2BITlgjgDhH0vvwZU/HZJVyk+2XUlvxXe8dFMedNX/aMkaOq++rMAFXc0tM7ij15QaWlbdQASBR9dihi+bDQ==
 
+"@types/json5@^0.0.29":
+  version "0.0.29"
+  resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
+  integrity sha1-7ihweulOEdK4J7y+UnC86n8+ce4=
+
 "@types/launchpad@^0.6.0":
   version "0.6.0"
   resolved "https://registry.yarnpkg.com/@types/launchpad/-/launchpad-0.6.0.tgz#37296109b7f277f6e6c5fd7e0c0706bc918fbb51"
@@ -912,9 +949,9 @@
   integrity sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==
 
 "@types/minimist@^1.2.0":
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/@types/minimist/-/minimist-1.2.0.tgz#69a23a3ad29caf0097f06eda59b361ee2f0639f6"
-  integrity sha1-aaI6OtKcrwCX8G7aWbNh7i8GOfY=
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/@types/minimist/-/minimist-1.2.1.tgz#283f669ff76d7b8260df8ab7a4262cc83d988256"
+  integrity sha512-fZQQafSREFyuZcdWFAExYjBiCL7AUCdgsk80iO0q4yihYYdcIiH28CcuPTGFgLOCC8RlW49GSQxdHwZP+I7CNg==
 
 "@types/mz@0.0.29":
   version "0.0.29"
@@ -937,9 +974,9 @@
   integrity sha512-rp7La3m845mSESCgsJePNL/JQyhkOJA6G4vcwvVgkDAwHhGdq5GCumxmPjEk1MZf+8p5ZQAUE7tqgQRQTXN7uQ==
 
 "@types/node@^10.1.0":
-  version "10.17.42"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.17.42.tgz#90dd71b26fe4f4e2929df6b07e72ef2e9648a173"
-  integrity sha512-HElxYF7C/MSkuvlaHB2c+82zhXiuO49Cq056Dol8AQuTph7oJtduo2n6J8rFa+YhJyNgQ/Lm20ZaxqD0vxU0+Q==
+  version "10.17.49"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.17.49.tgz#ecf0b67bab4b84d0ec9b0709db4aac3824a51c4a"
+  integrity sha512-PGaJNs5IZz5XgzwJvL/1zRfZB7iaJ5BydZ8/Picm+lUNYoNO9iVTQkVy5eUh0dZDrx3rBOIs3GCbCRmMuYyqwg==
 
 "@types/node@^4.0.30":
   version "4.9.3"
@@ -1225,49 +1262,76 @@
     "@types/events" "*"
     "@types/inquirer" "*"
 
-"@typescript-eslint/eslint-plugin@2.31.0":
-  version "2.31.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.31.0.tgz#942c921fec5e200b79593c71fafb1e3f57aa2e36"
-  integrity sha512-iIC0Pb8qDaoit+m80Ln/aaeu9zKQdOLF4SHcGLarSeY1gurW6aU4JsOPMjKQwXlw70MvWKZQc6S2NamA8SJ/gg==
+"@typescript-eslint/eslint-plugin@^4.11.0", "@typescript-eslint/eslint-plugin@^4.2.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.11.0.tgz#bc6c1e4175c0cf42083da4314f7931ad12f731cc"
+  integrity sha512-x4arJMXBxyD6aBXLm3W7mSDZRiABzy+2PCLJbL7OPqlp53VXhaA1HKK7R2rTee5OlRhnUgnp8lZyVIqjnyPT6g==
   dependencies:
-    "@typescript-eslint/experimental-utils" "2.31.0"
+    "@typescript-eslint/experimental-utils" "4.11.0"
+    "@typescript-eslint/scope-manager" "4.11.0"
+    debug "^4.1.1"
     functional-red-black-tree "^1.0.1"
     regexpp "^3.0.0"
+    semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/experimental-utils@2.31.0":
-  version "2.31.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-2.31.0.tgz#a9ec514bf7fd5e5e82bc10dcb6a86d58baae9508"
-  integrity sha512-MI6IWkutLYQYTQgZ48IVnRXmLR/0Q6oAyJgiOror74arUMh7EWjJkADfirZhRsUMHeLJ85U2iySDwHTSnNi9vA==
+"@typescript-eslint/experimental-utils@4.11.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.11.0.tgz#d1a47cc6cfe1c080ce4ead79267574b9881a1565"
+  integrity sha512-1VC6mSbYwl1FguKt8OgPs8xxaJgtqFpjY/UzUYDBKq4pfQ5lBvN2WVeqYkzf7evW42axUHYl2jm9tNyFsb8oLg==
   dependencies:
     "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/typescript-estree" "2.31.0"
+    "@typescript-eslint/scope-manager" "4.11.0"
+    "@typescript-eslint/types" "4.11.0"
+    "@typescript-eslint/typescript-estree" "4.11.0"
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
-"@typescript-eslint/parser@2.31.0":
-  version "2.31.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-2.31.0.tgz#beddd4e8efe64995108b229b2862cd5752d40d6f"
-  integrity sha512-uph+w6xUOlyV2DLSC6o+fBDzZ5i7+3/TxAsH4h3eC64tlga57oMb96vVlXoMwjR/nN+xyWlsnxtbDkB46M2EPQ==
+"@typescript-eslint/parser@^4.2.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.11.0.tgz#1dd3d7e42708c10ce9f3aa64c63c0ab99868b4e2"
+  integrity sha512-NBTtKCC7ZtuxEV5CrHUO4Pg2s784pvavc3cnz6V+oJvVbK4tH9135f/RBP6eUA2KHiFKAollSrgSctQGmHbqJQ==
   dependencies:
-    "@types/eslint-visitor-keys" "^1.0.0"
-    "@typescript-eslint/experimental-utils" "2.31.0"
-    "@typescript-eslint/typescript-estree" "2.31.0"
-    eslint-visitor-keys "^1.1.0"
-
-"@typescript-eslint/typescript-estree@2.31.0":
-  version "2.31.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-2.31.0.tgz#ac536c2d46672aa1f27ba0ec2140d53670635cfd"
-  integrity sha512-vxW149bXFXXuBrAak0eKHOzbcu9cvi6iNcJDzEtOkRwGHxJG15chiAQAwhLOsk+86p9GTr/TziYvw+H9kMaIgA==
-  dependencies:
+    "@typescript-eslint/scope-manager" "4.11.0"
+    "@typescript-eslint/types" "4.11.0"
+    "@typescript-eslint/typescript-estree" "4.11.0"
     debug "^4.1.1"
-    eslint-visitor-keys "^1.1.0"
-    glob "^7.1.6"
+
+"@typescript-eslint/scope-manager@4.11.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.11.0.tgz#2d906537db8a3a946721699e4fc0833810490254"
+  integrity sha512-6VSTm/4vC2dHM3ySDW9Kl48en+yLNfVV6LECU8jodBHQOhO8adAVizaZ1fV0QGZnLQjQ/y0aBj5/KXPp2hBTjA==
+  dependencies:
+    "@typescript-eslint/types" "4.11.0"
+    "@typescript-eslint/visitor-keys" "4.11.0"
+
+"@typescript-eslint/types@4.11.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.11.0.tgz#86cf95e7eac4ccfd183f9fcf1480cece7caf4ca4"
+  integrity sha512-XXOdt/NPX++txOQHM1kUMgJUS43KSlXGdR/aDyEwuAEETwuPt02Nc7v+s57PzuSqMbNLclblQdv3YcWOdXhQ7g==
+
+"@typescript-eslint/typescript-estree@4.11.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.11.0.tgz#1144d145841e5987d61c4c845442a24b24165a4b"
+  integrity sha512-eA6sT5dE5RHAFhtcC+b5WDlUIGwnO9b0yrfGa1mIOIAjqwSQCpXbLiFmKTdRbQN/xH2EZkGqqLDrKUuYOZ0+Hg==
+  dependencies:
+    "@typescript-eslint/types" "4.11.0"
+    "@typescript-eslint/visitor-keys" "4.11.0"
+    debug "^4.1.1"
+    globby "^11.0.1"
     is-glob "^4.0.1"
     lodash "^4.17.15"
-    semver "^6.3.0"
+    semver "^7.3.2"
     tsutils "^3.17.1"
 
+"@typescript-eslint/visitor-keys@4.11.0":
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.11.0.tgz#906669a50f06aa744378bb84c7d5c4fdbc5b7d51"
+  integrity sha512-tRYKyY0i7cMk6v4UIOCjl1LhuepC/pc6adQqJk4Is3YcC6k46HvsV9Wl7vQoLbm9qADgeujiT7KdLrylvFIQ+A==
+  dependencies:
+    "@typescript-eslint/types" "4.11.0"
+    eslint-visitor-keys "^2.0.0"
+
 "@webcomponents/webcomponentsjs@^1.0.7":
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/@webcomponents/webcomponentsjs/-/webcomponentsjs-1.3.3.tgz#5bb82a0d3210c836bd4623e13a4a93145cb9dc27"
@@ -1298,10 +1362,10 @@
   dependencies:
     acorn "^3.0.4"
 
-acorn-jsx@^5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.1.0.tgz#294adb71b57398b0680015f0a38c563ee1db5384"
-  integrity sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==
+acorn-jsx@^5.3.1:
+  version "5.3.1"
+  resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.1.tgz#fc8661e11b7ac1539c47dbfea2e72b3af34d267b"
+  integrity sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==
 
 acorn@^3.0.4:
   version "3.3.0"
@@ -1318,10 +1382,10 @@
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.2.0.tgz#67f0da2fc339d6cfb5d6fb244fd449f33cd8bbe3"
   integrity sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==
 
-acorn@^7.1.0:
-  version "7.1.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.0.tgz#949d36f2c292535da602283586c2477c57eb2d6c"
-  integrity sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==
+acorn@^7.4.0:
+  version "7.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.4.1.tgz#feaed255973d2e77555b83dbc08851a6c63520fa"
+  integrity sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==
 
 adm-zip@~0.4.3:
   version "0.4.13"
@@ -1340,7 +1404,7 @@
   dependencies:
     es6-promisify "^5.0.0"
 
-ajv@^6.10.0, ajv@^6.10.2:
+ajv@^6.10.0:
   version "6.10.2"
   resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.10.2.tgz#d3cea04d6b017b2894ad69040fec8b623eb4bd52"
   integrity sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==
@@ -1350,6 +1414,16 @@
     json-schema-traverse "^0.4.1"
     uri-js "^4.2.2"
 
+ajv@^6.12.4:
+  version "6.12.6"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.12.6.tgz#baf5a62e802b07d977034586f8c3baf5adf26df4"
+  integrity sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==
+  dependencies:
+    fast-deep-equal "^3.1.1"
+    fast-json-stable-stringify "^2.0.0"
+    json-schema-traverse "^0.4.1"
+    uri-js "^4.2.2"
+
 ajv@^6.5.5:
   version "6.10.1"
   resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.10.1.tgz#ebf8d3af22552df9dd049bfbe50cc2390e823593"
@@ -1381,6 +1455,11 @@
   dependencies:
     string-width "^3.0.0"
 
+ansi-colors@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/ansi-colors/-/ansi-colors-4.1.1.tgz#cbb9ae256bf750af1eab344f229aa27fe94ba348"
+  integrity sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==
+
 ansi-escapes@^1.1.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-1.4.0.tgz#d3a8a83b319aa67793662b13e761c7911422306e"
@@ -1392,11 +1471,11 @@
   integrity sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==
 
 ansi-escapes@^4.2.1:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-4.3.0.tgz#a4ce2b33d6b214b7950d8595c212f12ac9cc569d"
-  integrity sha512-EiYhwo0v255HUL6eDyuLrXEkTi7WwVCLAw+SeOQ7M7qdun1z1pum4DEm/nuqIVbPvi9RPPc9k9LbyBv6H0DwVg==
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-4.3.1.tgz#a5c47cc43181f1f38ffd7076837700d395522a61"
+  integrity sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==
   dependencies:
-    type-fest "^0.8.1"
+    type-fest "^0.11.0"
 
 ansi-regex@^2.0.0:
   version "2.1.1"
@@ -1423,13 +1502,20 @@
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
   integrity sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=
 
-ansi-styles@^3.2.0, ansi-styles@^3.2.1:
+ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
   integrity sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==
   dependencies:
     color-convert "^1.9.0"
 
+ansi-styles@^4.0.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.3.0.tgz#edd803628ae71c04c85ae7a0906edad34b648937"
+  integrity sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==
+  dependencies:
+    color-convert "^2.0.1"
+
 ansi-styles@^4.1.0:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.2.1.tgz#90ae75c424d008d2624c5bf29ead3177ebfcf359"
@@ -1559,13 +1645,15 @@
   resolved "https://registry.yarnpkg.com/array-flatten/-/array-flatten-1.1.1.tgz#9a5f699051b1e7073328f2a008968b64ea2955d2"
   integrity sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=
 
-array-includes@^3.0.3:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/array-includes/-/array-includes-3.1.1.tgz#cdd67e6852bdf9c1215460786732255ed2459348"
-  integrity sha512-c2VXaCHl7zPsvpkFsw4nxvFie4fh1ur9bpcgsVkIjqn0H/Xwdg+7fv3n2r/isyS8EBj5b06M9kHyZuIr4El6WQ==
+array-includes@^3.1.1:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/array-includes/-/array-includes-3.1.2.tgz#a8db03e0b88c8c6aeddc49cb132f9bcab4ebf9c8"
+  integrity sha512-w2GspexNQpx+PutG3QpT437/BenZBj0M/MZGn5mzv/MofYqo0xmRHzn4lFsoDlWJ+THYsGJmFlW68WlDFx7VRw==
   dependencies:
+    call-bind "^1.0.0"
     define-properties "^1.1.3"
-    es-abstract "^1.17.0"
+    es-abstract "^1.18.0-next.1"
+    get-intrinsic "^1.0.1"
     is-string "^1.0.5"
 
 array-union@^1.0.1:
@@ -1575,6 +1663,11 @@
   dependencies:
     array-uniq "^1.0.1"
 
+array-union@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/array-union/-/array-union-2.1.0.tgz#b798420adbeb1de828d84acd8a2e23d3efe85e8d"
+  integrity sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==
+
 array-uniq@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
@@ -1590,13 +1683,14 @@
   resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.3.2.tgz#a894b75d4bc4f6cd679ef3244a9fd8f46ae2d428"
   integrity sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=
 
-array.prototype.flat@^1.2.1:
-  version "1.2.3"
-  resolved "https://registry.yarnpkg.com/array.prototype.flat/-/array.prototype.flat-1.2.3.tgz#0de82b426b0318dbfdb940089e38b043d37f6c7b"
-  integrity sha512-gBlRZV0VSmfPIeWfuuy56XZMvbVfbEUnOXUvt3F/eUUUSyzlgLxhEX4YAEpxNAogRGehPSnfXyPtYyKAhkzQhQ==
+array.prototype.flat@^1.2.3:
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/array.prototype.flat/-/array.prototype.flat-1.2.4.tgz#6ef638b43312bd401b4c6199fdec7e2dc9e9a123"
+  integrity sha512-4470Xi3GAPAjZqFcljX2xzckv1qeKPizoNkiS0+O4IoPR2ZNpcjE0pkhdihlDouK+x6QOast26B4Q/O9DJnwSg==
   dependencies:
+    call-bind "^1.0.0"
     define-properties "^1.1.3"
-    es-abstract "^1.17.0-next.1"
+    es-abstract "^1.18.0-next.1"
 
 arraybuffer.slice@~0.0.7:
   version "0.0.7"
@@ -1608,11 +1702,6 @@
   resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
   integrity sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=
 
-arrify@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/arrify/-/arrify-2.0.1.tgz#c9655e9331e0abcd588d2a7cad7e9956f66701fa"
-  integrity sha512-3duEwti880xqi4eAMN8AyR4a0ByT90zoYdLlevfrvU43vb0YZwZVfxOgxWrLXXXpyugL0hNZc9G6BiB5B3nUug==
-
 asn1@~0.2.3:
   version "0.2.4"
   resolved "https://registry.yarnpkg.com/asn1/-/asn1-0.2.4.tgz#8d2475dfab553bb33e77b54e59e880bb8ce23136"
@@ -1630,10 +1719,10 @@
   resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
   integrity sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
 
-astral-regex@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-1.0.0.tgz#6c8c3fb827dd43ee3918f27b82782ab7658a6fd9"
-  integrity sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==
+astral-regex@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-2.0.0.tgz#483143c567aeed4785759c0865786dc77d7d2e31"
+  integrity sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==
 
 async-each@^1.0.0:
   version "1.0.3"
@@ -2183,6 +2272,13 @@
     split-string "^3.0.2"
     to-regex "^3.0.1"
 
+braces@^3.0.1:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/braces/-/braces-3.0.2.tgz#3454e1a462ee8d599e236df336cd9ea4f8afe107"
+  integrity sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==
+  dependencies:
+    fill-range "^7.0.1"
+
 browser-capabilities@^1.0.0:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/browser-capabilities/-/browser-capabilities-1.1.4.tgz#a6bd657a07a134532ad66c722b8949904478b973"
@@ -2292,6 +2388,14 @@
     normalize-url "^4.1.0"
     responselike "^1.0.2"
 
+call-bind@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/call-bind/-/call-bind-1.0.0.tgz#24127054bb3f9bdcb4b1fb82418186072f77b8ce"
+  integrity sha512-AEXsYIyyDY3MCzbwdhzG3Jx1R0J2wetQyUynn6dYHAO+bg8l1k7jwZtRv4ryryFs7EP+NDlikJlVe59jr0cM2w==
+  dependencies:
+    function-bind "^1.1.1"
+    get-intrinsic "^1.0.0"
+
 call-me-maybe@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/call-me-maybe/-/call-me-maybe-1.0.1.tgz#26d208ea89e37b5cbde60250a15f031c16a4d66b"
@@ -2342,16 +2446,11 @@
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
   integrity sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=
 
-camelcase@^5.0.0, camelcase@^5.3.1:
+camelcase@^5.3.1:
   version "5.3.1"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
   integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
 
-camelcase@^6.0.0:
-  version "6.0.0"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-6.0.0.tgz#5259f7c30e35e278f1bdc2a4d91230b37cad981e"
-  integrity sha512-8KMDF1Vz2gzOq54ONPJS65IvTUaB1cHJ2DMM7MbPmLZljDH1qpzzLsWdiN9pHh6qvkRVDTi/07+eNGch/oLU4w==
-
 cancel-token@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/cancel-token/-/cancel-token-0.1.1.tgz#c18197674bb1c84c1d6933ebf15d8d5a5ce79b4f"
@@ -2369,7 +2468,7 @@
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
   integrity sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
 
-chalk@*, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.0, chalk@^2.4.1, chalk@^2.4.2:
+chalk@*, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.3.0, chalk@^2.4.1, chalk@^2.4.2:
   version "2.4.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
   integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
@@ -2397,7 +2496,7 @@
     ansi-styles "^4.1.0"
     supports-color "^7.1.0"
 
-chalk@^4.0.0:
+chalk@^4.0.0, chalk@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.0.tgz#4e14870a618d9e2edd97dd8345fd9d9dc315646a"
   integrity sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==
@@ -2488,9 +2587,9 @@
   integrity sha1-T6kXw+WclKAEzWH47lCdplFocUM=
 
 cli-boxes@^2.2.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-2.2.0.tgz#538ecae8f9c6ca508e3c3c95b453fe93cb4c168d"
-  integrity sha512-gpaBrMAizVEANOpfZp/EEUixTXDyGt7DFzdK5hU+UbWt/J0lB0w20ncZj59Z9a93xHb9u12zF5BS6i9RKbtg4w==
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-2.2.1.tgz#ddd5035d25094fce220e9cab40a45840a440318f"
+  integrity sha512-y4coMcylgSCdVinjiDBuR8PCC2bLjyGTwEmPb9NHR/QaNU6EUOXcTY/s6VjGMD6ENSEaeQYHCY0GNGS5jfMwPw==
 
 cli-cursor@^1.0.1:
   version "1.0.2"
@@ -2525,6 +2624,11 @@
   resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-2.2.0.tgz#ff19ede8a9a5e579324147b0c11f0fbcbabed639"
   integrity sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=
 
+cli-width@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-3.0.0.tgz#a2f48437a2caa9a22436e794bf071ec9e61cedf6"
+  integrity sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw==
+
 clone-buffer@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/clone-buffer/-/clone-buffer-1.0.0.tgz#e3e25b207ac4e701af721e2cb5a16792cac3dc58"
@@ -2691,10 +2795,10 @@
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.19.0.tgz#f6198aa84e5b83c46054b94ddedbfed5ee9ff12a"
   integrity sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==
 
-comment-parser@^0.7.2:
-  version "0.7.2"
-  resolved "https://registry.yarnpkg.com/comment-parser/-/comment-parser-0.7.2.tgz#baf6d99b42038678b81096f15b630d18142f4b8a"
-  integrity sha512-4Rjb1FnxtOcv9qsfuaNuVsmmVn4ooVoBHzYfyKteiXwIU84PClyGA5jASoFMwPV93+FPh9spwueXauxFJZkGAg==
+comment-parser@^0.7.6:
+  version "0.7.6"
+  resolved "https://registry.yarnpkg.com/comment-parser/-/comment-parser-0.7.6.tgz#0e743a53c8e646c899a1323db31f6cd337b10f12"
+  integrity sha512-GKNxVA7/iuTnAqGADlTWX4tkhzxZKXp5fLJqKTlQLHkE65XDUKutZ3BHaJC5IGcper2tT3QRD1xr4o3jNpgXXg==
 
 commondir@^1.0.1:
   version "1.0.1"
@@ -2914,7 +3018,7 @@
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cross-spawn@^7.0.0:
+cross-spawn@^7.0.2, cross-spawn@^7.0.3:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
   integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
@@ -3004,6 +3108,13 @@
   dependencies:
     ms "^2.1.1"
 
+debug@^4.3.1:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.1.tgz#f0d229c505e0c6d8c49ac553d1b13dc183f6b2ee"
+  integrity sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==
+  dependencies:
+    ms "2.1.2"
+
 debug@~3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
@@ -3019,7 +3130,7 @@
     decamelize "^1.1.0"
     map-obj "^1.0.0"
 
-decamelize@^1.1.0, decamelize@^1.1.2, decamelize@^1.2.0:
+decamelize@^1.1.0, decamelize@^1.1.2:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
   integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
@@ -3046,7 +3157,7 @@
   resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
   integrity sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==
 
-deep-is@~0.1.3:
+deep-is@^0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
   integrity sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=
@@ -3196,6 +3307,13 @@
     arrify "^1.0.1"
     path-type "^3.0.0"
 
+dir-glob@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/dir-glob/-/dir-glob-3.0.1.tgz#56dbf73d992a4a93ba1584f4534063fd2e41717f"
+  integrity sha512-WkrWp9GR4KXfKGYzOLmTuGVi1UWFfws377n9cc55/tb6DuqyF6pcQ5AbiHEshaDpY9v6oaSr2XCDidGmMwdzIA==
+  dependencies:
+    path-type "^4.0.0"
+
 doctrine@1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-1.5.0.tgz#379dce730f6166f76cefa4e6707a159b02c5a6fa"
@@ -3218,12 +3336,13 @@
   dependencies:
     esutils "^2.0.2"
 
-dom-serializer@0:
-  version "0.2.2"
-  resolved "https://registry.yarnpkg.com/dom-serializer/-/dom-serializer-0.2.2.tgz#1afb81f533717175d478655debc5e332d9f9bb51"
-  integrity sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==
+dom-serializer@^1.0.1:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/dom-serializer/-/dom-serializer-1.2.0.tgz#3433d9136aeb3c627981daa385fc7f32d27c48f1"
+  integrity sha512-n6kZFH/KlCrqs/1GHMOd5i2fd/beQHuehKdWvNNffbGHTr/almdhuVvTVFb3V7fglz+nC50fFusu3lY33h12pA==
   dependencies:
     domelementtype "^2.0.1"
+    domhandler "^4.0.0"
     entities "^2.0.0"
 
 dom-urls@^1.1.0:
@@ -3242,30 +3361,33 @@
     clone "^2.1.0"
     parse5 "^4.0.0"
 
-domelementtype@1, domelementtype@^1.3.1:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-1.3.1.tgz#d048c44b37b0d10a7f2a3d5fee3f4333d790481f"
-  integrity sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w==
+domelementtype@^2.0.1, domelementtype@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-2.1.0.tgz#a851c080a6d1c3d94344aed151d99f669edf585e"
+  integrity sha512-LsTgx/L5VpD+Q8lmsXSHW2WpA+eBlZ9HPf3erD1IoPF00/3JKHZ3BknUVA2QGDNu69ZNmyFmCWBSO45XjYKC5w==
 
-domelementtype@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-2.0.1.tgz#1f8bdfe91f5a78063274e803b4bdcedf6e94f94d"
-  integrity sha512-5HOHUDsYZWV8FGWN0Njbr/Rn7f/eWSQi1v7+HsUVwXgn8nWWlL64zKDkS0n8ZmQ3mlWOMuXOnR+7Nx/5tMO5AQ==
-
-domhandler@^2.3.0:
-  version "2.4.2"
-  resolved "https://registry.yarnpkg.com/domhandler/-/domhandler-2.4.2.tgz#8805097e933d65e85546f726d60f5eb88b44f803"
-  integrity sha512-JiK04h0Ht5u/80fdLMCEmV4zkNh2BcoMFBmZ/91WtYZ8qVXSKjiw7fXMgFPnHcSZgOo3XdinHvmnDUeMf5R4wA==
+domhandler@^3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/domhandler/-/domhandler-3.3.0.tgz#6db7ea46e4617eb15cf875df68b2b8524ce0037a"
+  integrity sha512-J1C5rIANUbuYK+FuFL98650rihynUOEzRLxW+90bKZRWB6A1X1Tf82GxR1qAWLyfNPRvjqfip3Q5tdYlmAa9lA==
   dependencies:
-    domelementtype "1"
+    domelementtype "^2.0.1"
 
-domutils@^1.5.1:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/domutils/-/domutils-1.7.0.tgz#56ea341e834e06e6748af7a1cb25da67ea9f8c2a"
-  integrity sha512-Lgd2XcJ/NjEw+7tFvfKxOzCYKZsdct5lczQ2ZaQY8Djz7pfAD3Gbp8ySJWtreII/vDlMVmxwa6pHmdxIYgttDg==
+domhandler@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/domhandler/-/domhandler-4.0.0.tgz#01ea7821de996d85f69029e81fa873c21833098e"
+  integrity sha512-KPTbnGQ1JeEMQyO1iYXoagsI6so/C96HZiFyByU3T6iAzpXn8EGEvct6unm1ZGoed8ByO2oirxgwxBmqKF9haA==
   dependencies:
-    dom-serializer "0"
-    domelementtype "1"
+    domelementtype "^2.1.0"
+
+domutils@^2.4.2:
+  version "2.4.4"
+  resolved "https://registry.yarnpkg.com/domutils/-/domutils-2.4.4.tgz#282739c4b150d022d34699797369aad8d19bbbd3"
+  integrity sha512-jBC0vOsECI4OMdD0GC9mGn7NXPLb+Qt6KW1YDQzeQYRUFKmNG8lh7mO5HiELfr+lLQE7loDVI4QcAxV80HS+RA==
+  dependencies:
+    dom-serializer "^1.0.1"
+    domelementtype "^2.0.1"
+    domhandler "^4.0.0"
 
 dot-prop@^3.0.0:
   version "3.0.0"
@@ -3282,9 +3404,9 @@
     is-obj "^1.0.0"
 
 dot-prop@^5.2.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-5.2.0.tgz#c34ecc29556dc45f1f4c22697b6f4904e0cc4fcb"
-  integrity sha512-uEUyaDKoSQ1M4Oq8l45hSE26SnTxL6snNnqvK/VWx5wJhmff5z0FUVJDKDanor/6w3kzE3i7XZOk+7wC0EXr1A==
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-5.3.0.tgz#90ccce708cd9cd82cc4dc8c3ddd9abdd55b20e88"
+  integrity sha512-QM8q3zDe58hqUqjraQOmzZ1LIH9SWQJTlEKCH4kJ2oQvLZk7RbQXvtDM2XEq3fwkV9CCvvH4LA0AV+ogFsBM2Q==
   dependencies:
     is-obj "^2.0.0"
 
@@ -3422,15 +3544,17 @@
     engine.io-parser "~2.2.0"
     ws "^7.1.2"
 
-entities@^1.1.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/entities/-/entities-1.1.2.tgz#bdfa735299664dfafd34529ed4f8522a275fea56"
-  integrity sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w==
+enquirer@^2.3.5:
+  version "2.3.6"
+  resolved "https://registry.yarnpkg.com/enquirer/-/enquirer-2.3.6.tgz#2a7fe5dd634a1e4125a975ec994ff5456dc3734d"
+  integrity sha512-yjNnPr315/FjS4zIsUxYguYUPP2e1NK4d7E7ZOLiyYCcbFBiTMyID+2wvm2w6+pZ/odMA7cRkjhsPbltwBOrLg==
+  dependencies:
+    ansi-colors "^4.1.1"
 
 entities@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/entities/-/entities-2.0.0.tgz#68d6084cab1b079767540d80e56a39b423e4abf4"
-  integrity sha512-D9f7V0JSRwIxlRI2mjMqufDrRDnx8p+eEOz7aUM9SuvF8gsBzra0/6tbjl1m8eQHrZlYj6PxqE00hZ1SAIKPLw==
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/entities/-/entities-2.1.0.tgz#992d3129cf7df6870b96c57858c249a120f8b8b5"
+  integrity sha512-hCx1oky9PFrJ611mf0ifBLBRW8lUUVRlFolb5gWRfIELabBlbp9xZvrqZLZAs+NxFnbfQoeGd8wDkygjg7U85w==
 
 env-variable@0.0.x:
   version "0.0.5"
@@ -3459,22 +3583,23 @@
     string-template "~0.2.1"
     xtend "~4.0.0"
 
-es-abstract@^1.17.0, es-abstract@^1.17.0-next.1:
-  version "1.17.5"
-  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.17.5.tgz#d8c9d1d66c8981fb9200e2251d799eee92774ae9"
-  integrity sha512-BR9auzDbySxOcfog0tLECW8l28eRGpDpU3Dm3Hp4q/N+VtLTmyj4EUN088XZWQDW/hzj6sYRDXeOFsaAODKvpg==
+es-abstract@^1.18.0-next.1:
+  version "1.18.0-next.1"
+  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.18.0-next.1.tgz#6e3a0a4bda717e5023ab3b8e90bec36108d22c68"
+  integrity sha512-I4UGspA0wpZXWENrdA0uHbnhte683t3qT/1VFH9aX2dA5PPSf6QW5HHXf5HImaqPmjXaVeVk4RGWnaylmV7uAA==
   dependencies:
     es-to-primitive "^1.2.1"
     function-bind "^1.1.1"
     has "^1.0.3"
     has-symbols "^1.0.1"
-    is-callable "^1.1.5"
-    is-regex "^1.0.5"
-    object-inspect "^1.7.0"
+    is-callable "^1.2.2"
+    is-negative-zero "^2.0.0"
+    is-regex "^1.1.1"
+    object-inspect "^1.8.0"
     object-keys "^1.1.1"
-    object.assign "^4.1.0"
-    string.prototype.trimleft "^2.1.1"
-    string.prototype.trimright "^2.1.1"
+    object.assign "^4.1.1"
+    string.prototype.trimend "^1.0.1"
+    string.prototype.trimstart "^1.0.1"
 
 es-to-primitive@^1.2.1:
   version "1.2.1"
@@ -3517,30 +3642,30 @@
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
   integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
 
-eslint-config-google@^0.13.0:
-  version "0.13.0"
-  resolved "https://registry.yarnpkg.com/eslint-config-google/-/eslint-config-google-0.13.0.tgz#e277d16d2cb25c1ffd3fd13fb0035ad7421382fe"
-  integrity sha512-ELgMdOIpn0CFdsQS+FuxO+Ttu4p+aLaXHv9wA9yVnzqlUGV7oN/eRRnJekk7TCur6Cu2FXX0fqfIXRBaM14lpQ==
+eslint-config-google@^0.14.0:
+  version "0.14.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-google/-/eslint-config-google-0.14.0.tgz#4f5f8759ba6e11b424294a219dbfa18c508bcc1a"
+  integrity sha512-WsbX4WbjuMvTdeVL6+J3rK1RGhCTqjsFjX7UMSMgZiyxxaNLkoJENbrGExzERFeoTpGw3F3FypTiWAP9ZXzkEw==
 
-eslint-config-prettier@^6.10.1:
-  version "6.11.0"
-  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-6.11.0.tgz#f6d2238c1290d01c859a8b5c1f7d352a0b0da8b1"
-  integrity sha512-oB8cpLWSAjOVFEJhhyMZh6NOEOtBVziaqdDQ86+qhDHFbZXoRTM7pNSvFRfW/W/L/LrQ38C99J5CGuRBBzBsdA==
+eslint-config-prettier@^6.12.0:
+  version "6.15.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-6.15.0.tgz#7f93f6cb7d45a92f1537a70ecc06366e1ac6fed9"
+  integrity sha512-a1+kOYLR8wMGustcgAjdydMsQ2A/2ipRPwRKUmfYaSxc9ZPcrku080Ctl6zrZzZNs/U82MjSv+qKREkoq3bJaw==
   dependencies:
     get-stdin "^6.0.0"
 
-eslint-import-resolver-node@^0.3.2:
-  version "0.3.3"
-  resolved "https://registry.yarnpkg.com/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.3.tgz#dbaa52b6b2816b50bc6711af75422de808e98404"
-  integrity sha512-b8crLDo0M5RSe5YG8Pu2DYBj71tSB6OvXkfzwbJU2w7y8P4/yo0MyF8jU26IEuEuHF2K5/gcAJE3LhQGqBBbVg==
+eslint-import-resolver-node@^0.3.4:
+  version "0.3.4"
+  resolved "https://registry.yarnpkg.com/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.4.tgz#85ffa81942c25012d8231096ddf679c03042c717"
+  integrity sha512-ogtf+5AB/O+nM6DIeBUNr2fuT7ot9Qg/1harBfBtaP13ekEWFQEEMP94BCB7zaNW3gyY+8SHYF00rnqYwXKWOA==
   dependencies:
     debug "^2.6.9"
     resolve "^1.13.1"
 
-eslint-module-utils@^2.4.1:
-  version "2.5.2"
-  resolved "https://registry.yarnpkg.com/eslint-module-utils/-/eslint-module-utils-2.5.2.tgz#7878f7504824e1b857dd2505b59a8e5eda26a708"
-  integrity sha512-LGScZ/JSlqGKiT8OC+cYRxseMjyqt6QO54nl281CK93unD89ijSeRV6An8Ci/2nvWVKe8K/Tqdm75RQoIOCr+Q==
+eslint-module-utils@^2.6.0:
+  version "2.6.0"
+  resolved "https://registry.yarnpkg.com/eslint-module-utils/-/eslint-module-utils-2.6.0.tgz#579ebd094f56af7797d19c9866c9c9486629bfa6"
+  integrity sha512-6j9xxegbqe8/kZY8cYpcp0xhbK0EgJlg3g9mib3/miLaExuuwc3n5UEfSnU6hWMbT0FAYVvDbL9RrRgpUeQIvA==
   dependencies:
     debug "^2.6.9"
     pkg-dir "^2.0.0"
@@ -3553,44 +3678,44 @@
     eslint-utils "^2.0.0"
     regexpp "^3.0.0"
 
-eslint-plugin-html@^6.0.0:
-  version "6.0.0"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-html/-/eslint-plugin-html-6.0.0.tgz#28e5c3e71e6f612e07e73d7c215e469766628c13"
-  integrity sha512-PQcGippOHS+HTbQCStmH5MY1BF2MaU8qW/+Mvo/8xTa/ioeMXdSP+IiaBw2+nh0KEMfYQKuTz1Zo+vHynjwhbg==
+eslint-plugin-html@^6.1.1:
+  version "6.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-html/-/eslint-plugin-html-6.1.1.tgz#95aee151900b9bb2da5fa017b45cc64456a0a74e"
+  integrity sha512-JSe3ZDb7feKMnQM27XWGeoIjvP4oWQMJD9GZ6wW67J7/plVL87NK72RBwlvfc3tTZiYUchHhxAwtgEd1GdofDA==
   dependencies:
-    htmlparser2 "^3.10.1"
+    htmlparser2 "^5.0.1"
 
-eslint-plugin-import@^2.20.1:
-  version "2.20.1"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-import/-/eslint-plugin-import-2.20.1.tgz#802423196dcb11d9ce8435a5fc02a6d3b46939b3"
-  integrity sha512-qQHgFOTjguR+LnYRoToeZWT62XM55MBVXObHM6SKFd1VzDcX/vqT1kAz8ssqigh5eMj8qXcRoXXGZpPP6RfdCw==
+eslint-plugin-import@^2.22.1:
+  version "2.22.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-import/-/eslint-plugin-import-2.22.1.tgz#0896c7e6a0cf44109a2d97b95903c2bb689d7702"
+  integrity sha512-8K7JjINHOpH64ozkAhpT3sd+FswIZTfMZTjdx052pnWrgRCVfp8op9tbjpAk3DdUeI/Ba4C8OjdC0r90erHEOw==
   dependencies:
-    array-includes "^3.0.3"
-    array.prototype.flat "^1.2.1"
+    array-includes "^3.1.1"
+    array.prototype.flat "^1.2.3"
     contains-path "^0.1.0"
     debug "^2.6.9"
     doctrine "1.5.0"
-    eslint-import-resolver-node "^0.3.2"
-    eslint-module-utils "^2.4.1"
+    eslint-import-resolver-node "^0.3.4"
+    eslint-module-utils "^2.6.0"
     has "^1.0.3"
     minimatch "^3.0.4"
-    object.values "^1.1.0"
+    object.values "^1.1.1"
     read-pkg-up "^2.0.0"
-    resolve "^1.12.0"
+    resolve "^1.17.0"
+    tsconfig-paths "^3.9.0"
 
-eslint-plugin-jsdoc@^19.2.0:
-  version "19.2.0"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-19.2.0.tgz#f522b970878ae402b28ce62187305b33dfe2c834"
-  integrity sha512-QdNifBFLXCDGdy+26RXxcrqzEZarFWNybCZQVqJQYEYPlxd6lm+LPkrs6mCOhaGc2wqC6zqpedBQFX8nQJuKSw==
+eslint-plugin-jsdoc@^30.7.9:
+  version "30.7.9"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-30.7.9.tgz#b0a9881990edc1bc8a635467bad9edfae9ecbaaf"
+  integrity sha512-qMM0fNx7/6OCnIh3jRpIrEBAhTG1THNXXbr3yfJ8yqLrDbzJR98xsstX25xt9GCPlrjNc/bBpTHfJQOvn7nVMA==
   dependencies:
-    comment-parser "^0.7.2"
-    debug "^4.1.1"
-    jsdoctypeparser "^6.1.0"
-    lodash "^4.17.15"
-    object.entries-ponyfill "^1.0.1"
-    regextras "^0.7.0"
-    semver "^6.3.0"
-    spdx-expression-parse "^3.0.0"
+    comment-parser "^0.7.6"
+    debug "^4.3.1"
+    jsdoctypeparser "^9.0.0"
+    lodash "^4.17.20"
+    regextras "^0.7.1"
+    semver "^7.3.4"
+    spdx-expression-parse "^3.0.1"
 
 eslint-plugin-node@^11.1.0:
   version "11.1.0"
@@ -3604,17 +3729,10 @@
     resolve "^1.10.1"
     semver "^6.1.0"
 
-eslint-plugin-prettier@^3.1.2:
-  version "3.1.4"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-3.1.4.tgz#168ab43154e2ea57db992a2cd097c828171f75c2"
-  integrity sha512-jZDa8z76klRqo+TdGDTFJSavwbnWK2ZpqGKNZ+VvweMW516pDUMmQ2koXvxEE4JhzNvTv+radye/bWGBmA6jmg==
-  dependencies:
-    prettier-linter-helpers "^1.0.0"
-
-eslint-plugin-prettier@^3.1.3:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-3.1.3.tgz#ae116a0fc0e598fdae48743a4430903de5b4e6ca"
-  integrity sha512-+HG5jmu/dN3ZV3T6eCD7a4BlAySdN7mLIbJYo0z1cFQuI+r2DiTJEFeF68ots93PsnrMxbzIZ2S/ieX+mkrBeQ==
+eslint-plugin-prettier@^3.1.4, eslint-plugin-prettier@^3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-3.3.0.tgz#61e295349a65688ffac0b7808ef0a8244bdd8d40"
+  integrity sha512-tMTwO8iUWlSRZIwS9k7/E4vrTsfvsrcM5p1eftyuqWH25nKsz/o6/54I7jwQ/3zobISyC7wMy9ZsFwgTxOcOpQ==
   dependencies:
     prettier-linter-helpers "^1.0.0"
 
@@ -3626,14 +3744,15 @@
     esrecurse "^4.1.0"
     estraverse "^4.1.1"
 
-eslint-utils@^1.4.3:
-  version "1.4.3"
-  resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-1.4.3.tgz#74fec7c54d0776b6f67e0251040b5806564e981f"
-  integrity sha512-fbBN5W2xdY45KulGXmLHZ3c3FHfVYmKg0IrAKGOkT/464PQsx2UeIzfz1RmEci+KLm1bBaAzZAh8+/E+XAeZ8Q==
+eslint-scope@^5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-5.1.1.tgz#e786e59a66cb92b3f6c1fb0d508aab174848f48c"
+  integrity sha512-2NxwbF/hZ0KpepYN0cNbo+FN6XoK7GaHlQhgx/hIZl6Va0bF45RQOOwhLIy8lQDbuCiadSLCBnH2CFYquit5bw==
   dependencies:
-    eslint-visitor-keys "^1.1.0"
+    esrecurse "^4.3.0"
+    estraverse "^4.1.1"
 
-eslint-utils@^2.0.0:
+eslint-utils@^2.0.0, eslint-utils@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-2.1.0.tgz#d2de5e03424e707dc10c74068ddedae708741b27"
   integrity sha512-w94dQYoauyvlDc43XnGB8lU3Zt713vNChgt4EWwhXAP2XkBvndfxF0AgIqKOOasjPIPzj9JqgwkwbCYD0/V3Zg==
@@ -3645,46 +3764,56 @@
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz#e2a82cea84ff246ad6fb57f9bde5b46621459ec2"
   integrity sha512-8y9YjtM1JBJU/A9Kc+SbaOV4y29sSWckBwMHa+FGtVj5gN/sbnKDf6xJUl+8g7FAij9LVaP8C24DUiH/f/2Z9A==
 
-eslint@^6.6.0, eslint@^6.8.0:
-  version "6.8.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-6.8.0.tgz#62262d6729739f9275723824302fb227c8c93ffb"
-  integrity sha512-K+Iayyo2LtyYhDSYwz5D5QdWw0hCacNzyq1Y821Xna2xSJj7cijoLLYmLxTQgcgZ9mC61nryMy9S7GRbYpI5Ig==
+eslint-visitor-keys@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz#30ebd1ef7c2fdff01c3a4f151044af25fab0523e"
+  integrity sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==
+
+eslint-visitor-keys@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz#21fdc8fbcd9c795cc0321f0563702095751511a8"
+  integrity sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==
+
+eslint@^7.10.0, eslint@^7.16.0:
+  version "7.16.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-7.16.0.tgz#a761605bf9a7b32d24bb7cde59aeb0fd76f06092"
+  integrity sha512-iVWPS785RuDA4dWuhhgXTNrGxHHK3a8HLSMBgbbU59ruJDubUraXN8N5rn7kb8tG6sjg74eE0RA3YWT51eusEw==
   dependencies:
     "@babel/code-frame" "^7.0.0"
+    "@eslint/eslintrc" "^0.2.2"
     ajv "^6.10.0"
-    chalk "^2.1.0"
-    cross-spawn "^6.0.5"
+    chalk "^4.0.0"
+    cross-spawn "^7.0.2"
     debug "^4.0.1"
     doctrine "^3.0.0"
-    eslint-scope "^5.0.0"
-    eslint-utils "^1.4.3"
-    eslint-visitor-keys "^1.1.0"
-    espree "^6.1.2"
-    esquery "^1.0.1"
+    enquirer "^2.3.5"
+    eslint-scope "^5.1.1"
+    eslint-utils "^2.1.0"
+    eslint-visitor-keys "^2.0.0"
+    espree "^7.3.1"
+    esquery "^1.2.0"
     esutils "^2.0.2"
-    file-entry-cache "^5.0.1"
+    file-entry-cache "^6.0.0"
     functional-red-black-tree "^1.0.1"
     glob-parent "^5.0.0"
     globals "^12.1.0"
     ignore "^4.0.6"
     import-fresh "^3.0.0"
     imurmurhash "^0.1.4"
-    inquirer "^7.0.0"
     is-glob "^4.0.0"
     js-yaml "^3.13.1"
     json-stable-stringify-without-jsonify "^1.0.1"
-    levn "^0.3.0"
-    lodash "^4.17.14"
+    levn "^0.4.1"
+    lodash "^4.17.19"
     minimatch "^3.0.4"
-    mkdirp "^0.5.1"
     natural-compare "^1.4.0"
-    optionator "^0.8.3"
+    optionator "^0.9.1"
     progress "^2.0.0"
-    regexpp "^2.0.1"
-    semver "^6.1.2"
-    strip-ansi "^5.2.0"
-    strip-json-comments "^3.0.1"
-    table "^5.2.3"
+    regexpp "^3.1.0"
+    semver "^7.2.1"
+    strip-ansi "^6.0.0"
+    strip-json-comments "^3.1.0"
+    table "^6.0.4"
     text-table "^0.2.0"
     v8-compile-cache "^2.0.3"
 
@@ -3696,26 +3825,26 @@
     acorn "^5.5.0"
     acorn-jsx "^3.0.0"
 
-espree@^6.1.2:
-  version "6.1.2"
-  resolved "https://registry.yarnpkg.com/espree/-/espree-6.1.2.tgz#6c272650932b4f91c3714e5e7b5f5e2ecf47262d"
-  integrity sha512-2iUPuuPP+yW1PZaMSDM9eyVf8D5P0Hi8h83YtZ5bPc/zHYjII5khoixIUTMO794NOY8F/ThF1Bo8ncZILarUTA==
+espree@^7.3.0, espree@^7.3.1:
+  version "7.3.1"
+  resolved "https://registry.yarnpkg.com/espree/-/espree-7.3.1.tgz#f2df330b752c6f55019f8bd89b7660039c1bbbb6"
+  integrity sha512-v3JCNCE64umkFpmkFGqzVKsOT0tN1Zr+ueqLZfpV1Ob8e+CEgPWa+OxCoGH3tnhimMKIaBm4m/vaRpJ/krRz2g==
   dependencies:
-    acorn "^7.1.0"
-    acorn-jsx "^5.1.0"
-    eslint-visitor-keys "^1.1.0"
+    acorn "^7.4.0"
+    acorn-jsx "^5.3.1"
+    eslint-visitor-keys "^1.3.0"
 
 esprima@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.1.tgz#13b04cdb3e6c5d19df91ab6987a8695619b0aa71"
   integrity sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==
 
-esquery@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/esquery/-/esquery-1.0.1.tgz#406c51658b1f5991a5f9b62b1dc25b00e3e5c708"
-  integrity sha512-SmiyZ5zIWH9VM+SRUReLS5Q8a7GxtRdxEBVZpm98rJM7Sb+A9DVCndXfkeFUd3byderg+EbDkfnevfCwynWaNA==
+esquery@^1.2.0:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/esquery/-/esquery-1.3.1.tgz#b78b5828aa8e214e29fb74c4d5b752e1c033da57"
+  integrity sha512-olpvt9QG0vniUBZspVRN6lwB7hOZoTRtT+jzR+tS4ffYx2mzbw+z0XCOk44aaLYKApNX5nMm+E+P6o25ip/DHQ==
   dependencies:
-    estraverse "^4.0.0"
+    estraverse "^5.1.0"
 
 esrecurse@^4.1.0:
   version "4.2.1"
@@ -3724,11 +3853,23 @@
   dependencies:
     estraverse "^4.1.0"
 
-estraverse@^4.0.0, estraverse@^4.1.0, estraverse@^4.1.1:
+esrecurse@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/esrecurse/-/esrecurse-4.3.0.tgz#7ad7964d679abb28bee72cec63758b1c5d2c9921"
+  integrity sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==
+  dependencies:
+    estraverse "^5.2.0"
+
+estraverse@^4.1.0, estraverse@^4.1.1:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-4.3.0.tgz#398ad3f3c5a24948be7725e83d11a7de28cdbd1d"
   integrity sha512-39nnKffWz8xN1BU/2c79n9nB9HDzo0niYUqx6xyqUnyoAnQyyWpOTdZEeiCch8BBu515t4wp9ZmgVfVhn9EBpw==
 
+estraverse@^5.1.0, estraverse@^5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-5.2.0.tgz#307df42547e6cc7324d3cf03c155d5cdb8c53880"
+  integrity sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ==
+
 esutils@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
@@ -3770,19 +3911,19 @@
     signal-exit "^3.0.0"
     strip-eof "^1.0.0"
 
-execa@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/execa/-/execa-4.0.2.tgz#ad87fb7b2d9d564f70d2b62d511bee41d5cbb240"
-  integrity sha512-QI2zLa6CjGWdiQsmSkZoGtDx2N+cQIGb3yNolGTdjSQzydzLgYYf8LRuagp7S7fPimjcrzUDSUFd/MgzELMi4Q==
+execa@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-5.0.0.tgz#4029b0007998a841fbd1032e5f4de86a3c1e3376"
+  integrity sha512-ov6w/2LCiuyO4RLYGdpFGjkcs0wMTgGE8PrkTHikeUy5iJekXyPIKUjifk5CsE0pt7sMCrMZ3YNqoCj6idQOnQ==
   dependencies:
-    cross-spawn "^7.0.0"
-    get-stream "^5.0.0"
-    human-signals "^1.1.1"
+    cross-spawn "^7.0.3"
+    get-stream "^6.0.0"
+    human-signals "^2.1.0"
     is-stream "^2.0.0"
     merge-stream "^2.0.0"
-    npm-run-path "^4.0.0"
-    onetime "^5.1.0"
-    signal-exit "^3.0.2"
+    npm-run-path "^4.0.1"
+    onetime "^5.1.2"
+    signal-exit "^3.0.3"
     strip-final-newline "^2.0.0"
 
 exit-hook@^1.0.0:
@@ -3953,6 +4094,11 @@
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
   integrity sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=
 
+fast-deep-equal@^3.1.1:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
+  integrity sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==
+
 fast-diff@^1.1.2:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/fast-diff/-/fast-diff-1.2.0.tgz#73ee11982d86caaf7959828d519cfe927fac5f03"
@@ -3970,12 +4116,24 @@
     merge2 "^1.2.3"
     micromatch "^3.1.10"
 
+fast-glob@^3.1.1:
+  version "3.2.4"
+  resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-3.2.4.tgz#d20aefbf99579383e7f3cc66529158c9b98554d3"
+  integrity sha512-kr/Oo6PX51265qeuCYsyGypiO5uJFgBS0jksyG7FUeCyQzNwYnzrNIMR1NXfkZXsMYXYLRAHgISHBz8gQcxKHQ==
+  dependencies:
+    "@nodelib/fs.stat" "^2.0.2"
+    "@nodelib/fs.walk" "^1.2.3"
+    glob-parent "^5.1.0"
+    merge2 "^1.3.0"
+    micromatch "^4.0.2"
+    picomatch "^2.2.1"
+
 fast-json-stable-stringify@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz#d5142c0caee6b1189f87d3a76111064f86c8bbf2"
   integrity sha1-1RQsDK7msRifh9OnYREGT4bIu/I=
 
-fast-levenshtein@^2.0.6, fast-levenshtein@~2.0.6:
+fast-levenshtein@^2.0.6:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
   integrity sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=
@@ -3985,6 +4143,13 @@
   resolved "https://registry.yarnpkg.com/fast-safe-stringify/-/fast-safe-stringify-2.0.6.tgz#04b26106cc56681f51a044cfc0d76cf0008ac2c2"
   integrity sha512-q8BZ89jjc+mz08rSxROs8VsrBBcn1SIw1kq9NjolL509tkABRk9io01RAjSaEv1Xb2uFLt8VtRiZbGp5H8iDtg==
 
+fastq@^1.6.0:
+  version "1.10.0"
+  resolved "https://registry.yarnpkg.com/fastq/-/fastq-1.10.0.tgz#74dbefccade964932cdf500473ef302719c652bb"
+  integrity sha512-NL2Qc5L3iQEsyYzweq7qfgy5OtXCmGzGvhElGEd/SoFWEMOEczNh5s5ocaF01HDetxz+p8ecjNPA6cZxxIHmzA==
+  dependencies:
+    reusify "^1.0.4"
+
 fd-slicer@~1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/fd-slicer/-/fd-slicer-1.1.0.tgz#25c7c89cb1f9077f8891bbe61d8f390eae256f1e"
@@ -4013,18 +4178,18 @@
     escape-string-regexp "^1.0.5"
 
 figures@^3.0.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/figures/-/figures-3.1.0.tgz#4b198dd07d8d71530642864af2d45dd9e459c4ec"
-  integrity sha512-ravh8VRXqHuMvZt/d8GblBeqDMkdJMBdv/2KntFH+ra5MXkO7nxNKpzQ3n6QD/2da1kH0aWmNISdvhM7gl2gVg==
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/figures/-/figures-3.2.0.tgz#625c18bd293c604dc4a8ddb2febf0c88341746af"
+  integrity sha512-yaduQFRKLXYOGgEn6AZau90j3ggSOyiqXU0F9JZfeXYhNa+Jk4X+s45A2zg5jns87GAFa34BBm2kXw4XpNcbdg==
   dependencies:
     escape-string-regexp "^1.0.5"
 
-file-entry-cache@^5.0.1:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-5.0.1.tgz#ca0f6efa6dd3d561333fb14515065c2fafdf439c"
-  integrity sha512-bCg29ictuBaKUwwArK4ouCaqDgLZcysCFLmM/Yn/FDoqndh/9vNuQfXRDvTuXKLxfD/JtZQGKFT8MGcJBK644g==
+file-entry-cache@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-6.0.0.tgz#7921a89c391c6d93efec2169ac6bf300c527ea0a"
+  integrity sha512-fqoO76jZ3ZnYrXLDRxBR1YvOvc0k844kcOg40bgsPrE25LAb/PDqTY+ho64Xh2c8ZXgIKldchCFHczG2UVRcWA==
   dependencies:
-    flat-cache "^2.0.1"
+    flat-cache "^3.0.4"
 
 filename-regex@^2.0.0:
   version "2.0.1"
@@ -4052,6 +4217,13 @@
     repeat-string "^1.6.1"
     to-regex-range "^2.1.0"
 
+fill-range@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-7.0.1.tgz#1919a6a7c75fe38b2c7c77e5198535da9acdda40"
+  integrity sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==
+  dependencies:
+    to-regex-range "^5.0.1"
+
 filled-array@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/filled-array/-/filled-array-1.1.0.tgz#c3c4f6c663b923459a9aa29912d2d031f1507f84"
@@ -4146,19 +4318,18 @@
   dependencies:
     readable-stream "^2.0.2"
 
-flat-cache@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-2.0.1.tgz#5d296d6f04bda44a4630a301413bdbc2ec085ec0"
-  integrity sha512-LoQe6yDuUMDzQAEH8sgmh4Md6oZnc/7PjtwjNFSzveXqSHt6ka9fPBuso7IGf9Rz4uqnSnWiFH2B/zj24a5ReA==
+flat-cache@^3.0.4:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-3.0.4.tgz#61b0338302b2fe9f957dcc32fc2a87f1c3048b11"
+  integrity sha512-dm9s5Pw7Jc0GvMYbshN6zchCA9RgQlzzEZX3vylR9IqFfS8XciblUXOKfW6SiuJ0e13eDYZoZV5wdrev7P3Nwg==
   dependencies:
-    flatted "^2.0.0"
-    rimraf "2.6.3"
-    write "1.0.3"
+    flatted "^3.1.0"
+    rimraf "^3.0.2"
 
-flatted@^2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.1.tgz#69e57caa8f0eacbc281d2e2cb458d46fdb449e08"
-  integrity sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==
+flatted@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.1.0.tgz#a5d06b4a8b01e3a63771daa5cb7a1903e2e57067"
+  integrity sha512-tW+UkmtNg/jv9CSofAKvgVcO7c2URjhTdW1ZTkcAritblu8tajiYy7YisnIflEwtKssCtOxpnBRoCB7iap0/TA==
 
 follow-redirects@^1.0.0:
   version "1.9.0"
@@ -4257,6 +4428,11 @@
     nan "^2.12.1"
     node-pre-gyp "^0.12.0"
 
+fsevents@~2.1.2:
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.1.3.tgz#fb738703ae8d2f9fe900c33836ddebee8b97f23e"
+  integrity sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==
+
 function-bind@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
@@ -4281,6 +4457,15 @@
     strip-ansi "^3.0.1"
     wide-align "^1.1.0"
 
+get-intrinsic@^1.0.0, get-intrinsic@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/get-intrinsic/-/get-intrinsic-1.0.2.tgz#6820da226e50b24894e08859469dc68361545d49"
+  integrity sha512-aeX0vrFm21ILl3+JpFFRNe9aUvp6VFZb2/CTbgLb8j75kOhvoNYjt9d8KA/tJG4gSo8nzEDedRl0h7vDmBYRVg==
+  dependencies:
+    function-bind "^1.1.1"
+    has "^1.0.3"
+    has-symbols "^1.0.1"
+
 get-stdin@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/get-stdin/-/get-stdin-4.0.1.tgz#b968c6b0a04384324902e8bf1a5df32579a450fe"
@@ -4303,13 +4488,18 @@
   dependencies:
     pump "^3.0.0"
 
-get-stream@^5.0.0, get-stream@^5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-5.1.0.tgz#01203cdc92597f9b909067c3e656cc1f4d3c4dc9"
-  integrity sha512-EXr1FOzrzTfGeL0gQdeFEvOMm2mzMOglyiOXSTpPC+iAjAKftbr3jpCMWynogwYnM+eSj9sHGc6wjIcDvYiygw==
+get-stream@^5.1.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-5.2.0.tgz#4966a1795ee5ace65e706c4b7beb71257d6e22d3"
+  integrity sha512-nBF+F1rAZVCu/p7rjzgA+Yb4lfYXrpl7a6VmJrU8wF9I1CKvP/QwPNZHnOlwbTkY6dvtFIzFMSyQXbLoTQPRpA==
   dependencies:
     pump "^3.0.0"
 
+get-stream@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-6.0.0.tgz#3e0012cb6827319da2706e601a1583e8629a6718"
+  integrity sha512-A1B3Bh1UmL0bidM/YX2NsCOTnGJePL9rO/M+Mw3m9f2gUpfokS0hi5Eah0WSUEWZdZhIZtMjkIYS7mDfOqNHbg==
+
 get-value@^2.0.3, get-value@^2.0.6:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/get-value/-/get-value-2.0.6.tgz#dc15ca1c672387ca76bd37ac0a395ba2042a2c28"
@@ -4367,6 +4557,13 @@
   dependencies:
     is-glob "^4.0.1"
 
+glob-parent@^5.1.0:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.1.tgz#b6c1ef417c4e5663ea498f1c45afac6916bbc229"
+  integrity sha512-FnI+VGOpnlGHWZxthPGR+QhR78fuiK0sNLkHQv+bL9fQi57lNNdquIbna/WrfROrolq8GK5Ek6BiMwqL/voRYQ==
+  dependencies:
+    is-glob "^4.0.1"
+
 glob-stream@^5.3.2:
   version "5.3.5"
   resolved "https://registry.yarnpkg.com/glob-stream/-/glob-stream-5.3.5.tgz#a55665a9a8ccdc41915a87c701e32d4e016fad22"
@@ -4420,7 +4617,7 @@
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
-glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
+glob@^7.1.3, glob@^7.1.4:
   version "7.1.6"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.6.tgz#141f33b81a7c2492e125594307480c46679278a6"
   integrity sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==
@@ -4440,11 +4637,11 @@
     ini "^1.3.4"
 
 global-dirs@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-2.0.1.tgz#acdf3bb6685bcd55cb35e8a052266569e9469201"
-  integrity sha512-5HqUqdhkEovj2Of/ms3IeS/EekcO54ytHRLV4PEY2rhRwrHXLQjeVEES0Lhka0xwNDtGYn58wyC4s5+MHsOO6A==
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-2.1.0.tgz#e9046a49c806ff04d6c1825e196c8f0091e8df4d"
+  integrity sha512-MG6kdOUh/xBnyo9cJFeIKkLEc1AyFq42QTU4XiX51i2NEdxLxLWXIjEjmqKeSuKR7pAZjTqUVoT2b2huxVLgYQ==
   dependencies:
-    ini "^1.3.5"
+    ini "1.3.7"
 
 global-modules@^0.2.3:
   version "0.2.3"
@@ -4501,6 +4698,18 @@
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
   integrity sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==
 
+globby@^11.0.1:
+  version "11.0.1"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-11.0.1.tgz#9a2bf107a068f3ffeabc49ad702c79ede8cfd357"
+  integrity sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==
+  dependencies:
+    array-union "^2.1.0"
+    dir-glob "^3.0.1"
+    fast-glob "^3.1.1"
+    ignore "^5.1.4"
+    merge2 "^1.3.0"
+    slash "^3.0.0"
+
 globby@^4.0.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/globby/-/globby-4.1.0.tgz#080f54549ec1b82a6c60e631fc82e1211dbe95f8"
@@ -4629,25 +4838,25 @@
   dependencies:
     lodash "^4.17.2"
 
-gts@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/gts/-/gts-2.0.2.tgz#b8b28de99361b5c5c24db30a375a0f546bbc04a4"
-  integrity sha512-SLytzl2IqKXf6kGULwr07XQ9lVsvjrzFD3OAA7DEfIQYuD+lKBPt/cZ/RYGxaWerY4PTfmnXT7KdxEr9Ec8uHQ==
+gts@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/gts/-/gts-3.0.3.tgz#36716d87680c2d1a0e02867c91bb7169cede9369"
+  integrity sha512-XHFGhDzoyaHDVHlhNfz369erxuSEIyVMtJoRAz8Dt2NpidG5pOJzI/44lWhsLVigph64TgAWPWBsBTQFCQ1mTw==
   dependencies:
-    "@typescript-eslint/eslint-plugin" "2.31.0"
-    "@typescript-eslint/parser" "2.31.0"
-    chalk "^4.0.0"
-    eslint "^6.8.0"
-    eslint-config-prettier "^6.10.1"
+    "@typescript-eslint/eslint-plugin" "^4.2.0"
+    "@typescript-eslint/parser" "^4.2.0"
+    chalk "^4.1.0"
+    eslint "^7.10.0"
+    eslint-config-prettier "^6.12.0"
     eslint-plugin-node "^11.1.0"
-    eslint-plugin-prettier "^3.1.2"
-    execa "^4.0.0"
-    inquirer "^7.1.0"
-    meow "^7.0.0"
+    eslint-plugin-prettier "^3.1.4"
+    execa "^5.0.0"
+    inquirer "^7.3.3"
+    meow "^8.0.0"
     ncp "^2.0.0"
-    prettier "^2.0.4"
+    prettier "^2.1.2"
     rimraf "^3.0.2"
-    update-notifier "^4.1.0"
+    update-notifier "^5.0.0"
     write-file-atomic "^3.0.3"
 
 gulp-if@^2.0.2:
@@ -4833,6 +5042,13 @@
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.7.1.tgz#97f236977bd6e125408930ff6de3eec6281ec047"
   integrity sha512-7T/BxH19zbcCTa8XkMlbK5lTo1WtgkFi3GvdWEyNuc4Vex7/9Dqbnpsf4JMydcfj9HCg4zUWFTL3Za6lapg5/w==
 
+hosted-git-info@^3.0.6:
+  version "3.0.7"
+  resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-3.0.7.tgz#a30727385ea85acfcee94e0aad9e368c792e036c"
+  integrity sha512-fWqc0IcuXs+BmE9orLDyVykAG9GJtGLGuZAAqgcckPgv5xad4AcXGIv8galtQvlwutxSlaMcdw7BUtq2EIvqCQ==
+  dependencies:
+    lru-cache "^6.0.0"
+
 hpack.js@^2.1.6:
   version "2.1.6"
   resolved "https://registry.yarnpkg.com/hpack.js/-/hpack.js-2.1.6.tgz#87774c0949e513f42e84575b3c45681fade2a0b2"
@@ -4856,17 +5072,15 @@
     relateurl "0.2.x"
     uglify-js "3.4.x"
 
-htmlparser2@^3.10.1:
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/htmlparser2/-/htmlparser2-3.10.1.tgz#bd679dc3f59897b6a34bb10749c855bb53a9392f"
-  integrity sha512-IgieNijUMbkDovyoKObU1DUhm1iwNYE/fuifEoEHfd1oZKZDaONBSkal7Y01shxsM49R4XaMdGez3WnF9UfiCQ==
+htmlparser2@^5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/htmlparser2/-/htmlparser2-5.0.1.tgz#7daa6fc3e35d6107ac95a4fc08781f091664f6e7"
+  integrity sha512-vKZZra6CSe9qsJzh0BjBGXo8dvzNsq/oGvsjfRdOrrryfeD9UOBEEQdeoqCRmKZchF5h2zOBMQ6YuQ0uRUmdbQ==
   dependencies:
-    domelementtype "^1.3.1"
-    domhandler "^2.3.0"
-    domutils "^1.5.1"
-    entities "^1.1.1"
-    inherits "^2.0.1"
-    readable-stream "^3.1.1"
+    domelementtype "^2.0.1"
+    domhandler "^3.3.0"
+    domutils "^2.4.2"
+    entities "^2.0.0"
 
 http-cache-semantics@^4.0.0:
   version "4.1.0"
@@ -4943,10 +5157,10 @@
     agent-base "^4.3.0"
     debug "^3.1.0"
 
-human-signals@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/human-signals/-/human-signals-1.1.1.tgz#c5b1cd14f50aeae09ab6c59fe63ba3395fe4dfa3"
-  integrity sha512-SEQu7vl8KjNL2eoGBLF3+wAjpsNfA9XMlXAYj/3EdaNfAlxKthD1xjEQfGOUhllCGGJVNY34bRr6lPINhNjyZw==
+human-signals@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/human-signals/-/human-signals-2.1.0.tgz#dc91fcba42e4d06e4abaed33b3e7a3c02f514ea0"
+  integrity sha512-B4FFZ6q/T2jhhksgkbEW3HBvWIfDW85snkQgawt07S7J5QXTk6BkNV+0yAeZrM5QpMAdYlocGoljn0sJ/WQkFw==
 
 iconv-lite@0.4.24, iconv-lite@^0.4.24, iconv-lite@^0.4.4:
   version "0.4.24"
@@ -4977,7 +5191,7 @@
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-4.0.6.tgz#750e3db5862087b4737ebac8207ffd1ef27b25fc"
   integrity sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==
 
-ignore@^5.1.1:
+ignore@^5.1.1, ignore@^5.1.4:
   version "5.1.8"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-5.1.8.tgz#f150a8b50a34289b33e22f5889abd4d8016f0e57"
   integrity sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw==
@@ -4990,6 +5204,14 @@
     parent-module "^1.0.0"
     resolve-from "^4.0.0"
 
+import-fresh@^3.2.1:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/import-fresh/-/import-fresh-3.3.0.tgz#37162c25fcb9ebaa2e6e53d5b4d88ce17d9e0c2b"
+  integrity sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==
+  dependencies:
+    parent-module "^1.0.0"
+    resolve-from "^4.0.0"
+
 import-lazy@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/import-lazy/-/import-lazy-2.1.0.tgz#05698e3d45c88e8d7e9d92cb0584e77f096f3e43"
@@ -5040,7 +5262,12 @@
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
   integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
 
-ini@^1.3.4, ini@^1.3.5, ini@~1.3.0:
+ini@1.3.7:
+  version "1.3.7"
+  resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.7.tgz#a09363e1911972ea16d7a8851005d84cf09a9a84"
+  integrity sha512-iKpRpXP+CrP2jyrxvg1kMUpXDyRUFDWurxbnVT1vQPx+Wz9uCYsMIqYuSBLV+PAaZG/d7kRLKRFc9oDMsH+mFQ==
+
+ini@^1.3.4, ini@~1.3.0:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
   integrity sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
@@ -5084,40 +5311,21 @@
     strip-ansi "^5.1.0"
     through "^2.3.6"
 
-inquirer@^7.0.0:
-  version "7.0.3"
-  resolved "https://registry.yarnpkg.com/inquirer/-/inquirer-7.0.3.tgz#f9b4cd2dff58b9f73e8d43759436ace15bed4567"
-  integrity sha512-+OiOVeVydu4hnCGLCSX+wedovR/Yzskv9BFqUNNKq9uU2qg7LCcCo3R86S2E7WLo0y/x2pnEZfZe1CoYnORUAw==
+inquirer@^7.3.3:
+  version "7.3.3"
+  resolved "https://registry.yarnpkg.com/inquirer/-/inquirer-7.3.3.tgz#04d176b2af04afc157a83fd7c100e98ee0aad003"
+  integrity sha512-JG3eIAj5V9CwcGvuOmoo6LB9kbAYT8HXffUl6memuszlwDC/qvFAJw49XJ5NROSFNPxp3iQg1GqkFhaY/CR0IA==
   dependencies:
     ansi-escapes "^4.2.1"
-    chalk "^2.4.2"
+    chalk "^4.1.0"
     cli-cursor "^3.1.0"
-    cli-width "^2.0.0"
+    cli-width "^3.0.0"
     external-editor "^3.0.3"
     figures "^3.0.0"
-    lodash "^4.17.15"
-    mute-stream "0.0.8"
-    run-async "^2.2.0"
-    rxjs "^6.5.3"
-    string-width "^4.1.0"
-    strip-ansi "^5.1.0"
-    through "^2.3.6"
-
-inquirer@^7.1.0:
-  version "7.2.0"
-  resolved "https://registry.yarnpkg.com/inquirer/-/inquirer-7.2.0.tgz#63ce99d823090de7eb420e4bb05e6f3449aa389a"
-  integrity sha512-E0c4rPwr9ByePfNlTIB8z51kK1s2n6jrHuJeEHENl/sbq2G/S1auvibgEwNR4uSyiU+PiYHqSwsgGiXjG8p5ZQ==
-  dependencies:
-    ansi-escapes "^4.2.1"
-    chalk "^3.0.0"
-    cli-cursor "^3.1.0"
-    cli-width "^2.0.0"
-    external-editor "^3.0.3"
-    figures "^3.0.0"
-    lodash "^4.17.15"
+    lodash "^4.17.19"
     mute-stream "0.0.8"
     run-async "^2.4.0"
-    rxjs "^6.5.3"
+    rxjs "^6.6.0"
     string-width "^4.1.0"
     strip-ansi "^6.0.0"
     through "^2.3.6"
@@ -5180,10 +5388,10 @@
   resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
   integrity sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w==
 
-is-callable@^1.1.4, is-callable@^1.1.5:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/is-callable/-/is-callable-1.1.5.tgz#f7e46b596890456db74e7f6e976cb3273d06faab"
-  integrity sha512-ESKv5sMCJB2jnHTWZ3O5itG+O128Hsus4K4Qh1h2/cgn2vbgnLSVqfV46AeJA9D5EeeLa9w81KUXMtn34zhX+Q==
+is-callable@^1.1.4, is-callable@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/is-callable/-/is-callable-1.2.2.tgz#c7c6715cd22d4ddb48d3e19970223aceabb080d9"
+  integrity sha512-dnMqspv5nU3LoewK2N/y7KLtxtakvTuaCsU9FU50/QDmdbHNy/4/JuRtMHqRU22o3q+W89YQndQEeCVwK+3qrA==
 
 is-ci@^1.0.10:
   version "1.2.1"
@@ -5199,6 +5407,13 @@
   dependencies:
     ci-info "^2.0.0"
 
+is-core-module@^2.1.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/is-core-module/-/is-core-module-2.2.0.tgz#97037ef3d52224d85163f5597b2b63d9afed981a"
+  integrity sha512-XRAfAdyyY5F5cOXn7hYQDqh2Xmii+DEfIcQGxK/uNwMHhIkPWO0g8msXcbzLe+MpGoR951MlqM/2iIlU4vKDdQ==
+  dependencies:
+    has "^1.0.3"
+
 is-data-descriptor@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz#0b5ee648388e2c860282e793f1856fec3f301b56"
@@ -5333,7 +5548,7 @@
     global-dirs "^0.1.0"
     is-path-inside "^1.0.0"
 
-is-installed-globally@^0.3.1:
+is-installed-globally@^0.3.2:
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/is-installed-globally/-/is-installed-globally-0.3.2.tgz#fd3efa79ee670d1187233182d5b0a1dd00313141"
   integrity sha512-wZ8x1js7Ia0kecP/CHM/3ABkAmujX7WPvQk6uu3Fly/Mk44pySulQpnHG46OMjHGXApINnV4QhY3SWnECO2z5g==
@@ -5341,15 +5556,20 @@
     global-dirs "^2.0.1"
     is-path-inside "^3.0.1"
 
+is-negative-zero@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/is-negative-zero/-/is-negative-zero-2.0.1.tgz#3de746c18dda2319241a53675908d8f766f11c24"
+  integrity sha512-2z6JzQvZRa9A2Y7xC6dQQm4FSTSTNWjKIYYTt4246eMTJmIo0Q+ZyOsU66X8lxK1AbB92dFeglPLrhwpeRKO6w==
+
 is-npm@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-npm/-/is-npm-1.0.0.tgz#f2fb63a65e4905b406c86072765a1a4dc793b9f4"
   integrity sha1-8vtjpl5JBbQGyGBydloaTceTufQ=
 
-is-npm@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/is-npm/-/is-npm-4.0.0.tgz#c90dd8380696df87a7a6d823c20d0b12bbe3c84d"
-  integrity sha512-96ECIfh9xtDDlPylNPXhzjsykHsMJZ18ASpaWzQyBr4YRTcVjUvzaHayDAES2oU/3KpljhHUjtSRNiDwi0F0ig==
+is-npm@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/is-npm/-/is-npm-5.0.0.tgz#43e8d65cc56e1b67f8d47262cf667099193f45a8"
+  integrity sha512-WW/rQLOazUq+ST/bCAVBp/2oMERWLsR7OrKyt052dNDk4DHcDE0/7QSXITlmi+VBcV13DfIbysG3tZJm5RfdBA==
 
 is-number@^2.1.0:
   version "2.1.0"
@@ -5370,6 +5590,11 @@
   resolved "https://registry.yarnpkg.com/is-number/-/is-number-4.0.0.tgz#0026e37f5454d73e356dfe6564699867c6a7f0ff"
   integrity sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==
 
+is-number@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-7.0.0.tgz#7535345b896734d5f80c4d06c50955527a14f12b"
+  integrity sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==
+
 is-obj@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-obj/-/is-obj-1.0.1.tgz#3e4729ac1f5fde025cd7d83a896dab9f4f67db0f"
@@ -5453,12 +5678,12 @@
   resolved "https://registry.yarnpkg.com/is-redirect/-/is-redirect-1.0.0.tgz#1d03dded53bd8db0f30c26e4f95d36fc7c87dc24"
   integrity sha1-HQPd7VO9jbDzDCbk+V02/HyH3CQ=
 
-is-regex@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.0.5.tgz#39d589a358bf18967f726967120b8fc1aed74eae"
-  integrity sha512-vlKW17SNq44owv5AQR3Cq0bQPEb8+kF3UKZ2fiZNOWtztYE5i0CzCZxFDwO58qAOWtxdBRVO/V5Qin1wjCqFYQ==
+is-regex@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.1.1.tgz#c6f98aacc546f6cec5468a07b7b153ab564a57b9"
+  integrity sha512-1+QkEcxiLlB7VEyFtyBg94e08OAsvq7FUBgApTq/w2ymCLyKJgDPsybBENVtA7XCQEgEXxKPonG+mvYRxh/LIg==
   dependencies:
-    has "^1.0.3"
+    has-symbols "^1.0.1"
 
 is-retry-allowed@^1.0.0:
   version "1.1.0"
@@ -5613,10 +5838,10 @@
   resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
   integrity sha1-peZUwuWi3rXyAdls77yoDA7y9RM=
 
-jsdoctypeparser@^6.1.0:
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/jsdoctypeparser/-/jsdoctypeparser-6.1.0.tgz#acfb936c26300d98f1405cb03e20b06748e512a8"
-  integrity sha512-UCQBZ3xCUBv/PLfwKAJhp6jmGOSLFNKzrotXGNgbKhWvz27wPsCsVeP7gIcHPElQw2agBmynAitXqhxR58XAmA==
+jsdoctypeparser@^9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/jsdoctypeparser/-/jsdoctypeparser-9.0.0.tgz#8c97e2fb69315eb274b0f01377eaa5c940bd7b26"
+  integrity sha512-jrTA2jJIL6/DAEILBEh2/w9QxCuwmvNXIry39Ay/HVfhE3o2yVV0U44blYkqdHA/OKloJEqvJy0xU+GSdE2SIw==
 
 jsesc@^1.3.0:
   version "1.3.0"
@@ -5643,6 +5868,11 @@
   resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
   integrity sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==
 
+json-parse-even-better-errors@^2.3.0:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz#7c47805a94319928e05777405dc12e1f7a4ee02d"
+  integrity sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w==
+
 json-schema-traverse@^0.4.1:
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz#69f6a87d9513ab8bb8fe63bdb0979c448e684660"
@@ -5663,6 +5893,13 @@
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
   integrity sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=
 
+json5@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/json5/-/json5-1.0.1.tgz#779fb0018604fa854eacbf6252180d83543e3dbe"
+  integrity sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==
+  dependencies:
+    minimist "^1.2.0"
+
 json5@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.0.tgz#e7a0c62c48285c628d20a10b85c89bb807c32850"
@@ -5742,7 +5979,7 @@
   dependencies:
     package-json "^4.0.0"
 
-latest-version@^5.0.0:
+latest-version@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/latest-version/-/latest-version-5.1.0.tgz#119dfe908fe38d15dfa43ecd13fa12ec8832face"
   integrity sha512-weT+r0kTkRQdCdYCNtkMwWXQTMEswKrFBkm4ckQOMVhhqhIMI1UT2hMj+1iigIhgSZm5gTmrRXBNoGUgaTY1xA==
@@ -5775,13 +6012,13 @@
   dependencies:
     readable-stream "^2.0.5"
 
-levn@^0.3.0, levn@~0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"
-  integrity sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=
+levn@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/levn/-/levn-0.4.1.tgz#ae4562c007473b932a6200d403268dd2fffc6ade"
+  integrity sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==
   dependencies:
-    prelude-ls "~1.1.2"
-    type-check "~0.3.2"
+    prelude-ls "^1.2.1"
+    type-check "~0.4.0"
 
 lines-and-columns@^1.1.6:
   version "1.1.6"
@@ -5942,6 +6179,11 @@
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.12.tgz#a712c74fdc31f7ecb20fe44f157d802d208097ef"
   integrity sha512-+CiwtLnsJhX03p20mwXuvhoebatoh5B3tt+VvYlrPgZC1g36y+RRbkufX95Xa+X4I59aWEacDFYwnJZiyBh9gA==
 
+lodash@^4.17.19, lodash@^4.17.20:
+  version "4.17.20"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
+  integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
+
 log-symbols@^1.0.0, log-symbols@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/log-symbols/-/log-symbols-1.0.2.tgz#376ff7b58ea3086a0f09facc74617eca501e1a18"
@@ -6026,6 +6268,13 @@
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
+lru-cache@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-6.0.0.tgz#6d6fe6570ebd96aaf90fcad1dafa3b2566db3a94"
+  integrity sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==
+  dependencies:
+    yallist "^4.0.0"
+
 macos-release@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/macos-release/-/macos-release-2.3.0.tgz#eb1930b036c0800adebccd5f17bc4c12de8bb71f"
@@ -6142,24 +6391,22 @@
     redent "^1.0.0"
     trim-newlines "^1.0.0"
 
-meow@^7.0.0:
-  version "7.0.1"
-  resolved "https://registry.yarnpkg.com/meow/-/meow-7.0.1.tgz#1ed4a0a50b3844b451369c48362eb0515f04c1dc"
-  integrity sha512-tBKIQqVrAHqwit0vfuFPY3LlzJYkEOFyKa3bPgxzNl6q/RtN8KQ+ALYEASYuFayzSAsjlhXj/JZ10rH85Q6TUw==
+meow@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/meow/-/meow-8.0.0.tgz#1aa10ee61046719e334ffdc038bb5069250ec99a"
+  integrity sha512-nbsTRz2fwniJBFgUkcdISq8y/q9n9VbiHYbfwklFh5V4V2uAcxtKQkDc0yCLPM/kP0d+inZBewn3zJqewHE7kg==
   dependencies:
     "@types/minimist" "^1.2.0"
-    arrify "^2.0.1"
-    camelcase "^6.0.0"
     camelcase-keys "^6.2.2"
     decamelize-keys "^1.1.0"
     hard-rejection "^2.1.0"
-    minimist-options "^4.0.2"
-    normalize-package-data "^2.5.0"
+    minimist-options "4.1.0"
+    normalize-package-data "^3.0.0"
     read-pkg-up "^7.0.1"
     redent "^3.0.0"
     trim-newlines "^3.0.0"
-    type-fest "^0.13.1"
-    yargs-parser "^18.1.3"
+    type-fest "^0.18.0"
+    yargs-parser "^20.2.3"
 
 merge-descriptors@1.0.1:
   version "1.0.1"
@@ -6183,6 +6430,11 @@
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.2.3.tgz#7ee99dbd69bb6481689253f018488a1b902b0ed5"
   integrity sha512-gdUU1Fwj5ep4kplwcmftruWofEFt6lfpkkr3h860CXbAB9c3hGb55EOL2ali0Td5oebvW0E1+3Sr+Ur7XfKpRA==
 
+merge2@^1.3.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.4.1.tgz#4368892f885e907455a6fd7dc55c0c9d404990ae"
+  integrity sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==
+
 methods@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
@@ -6226,6 +6478,14 @@
     snapdragon "^0.8.1"
     to-regex "^3.0.2"
 
+micromatch@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.2.tgz#4fcb0999bf9fbc2fcbdd212f6d629b9a56c39259"
+  integrity sha512-y7FpHSbMUMoyPbYUSzO6PaZ6FyRnQOpHuKwbo1G+Knck95XVU4QAiKdGEnj5wwoS7PlOgthX/09u5iFJ+aYf5Q==
+  dependencies:
+    braces "^3.0.1"
+    picomatch "^2.0.5"
+
 mime-db@1.40.0, mime-db@^1.28.0:
   version "1.40.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.40.0.tgz#a65057e998db090f732a68f6c276d387d4126c32"
@@ -6304,7 +6564,7 @@
   dependencies:
     brace-expansion "^1.1.7"
 
-minimist-options@^4.0.2:
+minimist-options@4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/minimist-options/-/minimist-options-4.1.0.tgz#c0655713c53a8a2ebd77ffa247d342c40f010619"
   integrity sha512-Q4r8ghd80yhO/0j1O3B2BjweX3fiHg9cdOwjJd2J76Q135c+NDxGCqdYKQ1SKBuFfgWbAUzBfvYjPUEeNgqN1A==
@@ -6368,7 +6628,7 @@
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
   integrity sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
 
-ms@^2.1.1:
+ms@2.1.2, ms@^2.1.1:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
   integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
@@ -6544,6 +6804,16 @@
     semver "2 || 3 || 4 || 5"
     validate-npm-package-license "^3.0.1"
 
+normalize-package-data@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-3.0.0.tgz#1f8a7c423b3d2e85eb36985eaf81de381d01301a"
+  integrity sha512-6lUjEI0d3v6kFrtgA/lOx4zHCWULXsFNIjHolnZCKCTLA6m/G625cdn3O7eNmT0iD3jfo6HZ9cdImGZwf21prw==
+  dependencies:
+    hosted-git-info "^3.0.6"
+    resolve "^1.17.0"
+    semver "^7.3.2"
+    validate-npm-package-license "^3.0.1"
+
 normalize-path@^2.0.0, normalize-path@^2.0.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-2.1.1.tgz#1ab28b556e198363a8c1a6f7e6fa20137fe6aed9"
@@ -6581,7 +6851,7 @@
   dependencies:
     path-key "^2.0.0"
 
-npm-run-path@^4.0.0:
+npm-run-path@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-4.0.1.tgz#b7ecd1e5ed53da8e37a55e1c2269e0b97ed748ea"
   integrity sha512-S48WzZW777zhNIrn7gxOlISNAqi9ZC/uQFnRdbeIHhZhCA6UqpkOT8T1G7BvfdgP4Er8gF4sUbaS0i7QvIfCWw==
@@ -6627,10 +6897,10 @@
     define-property "^0.2.5"
     kind-of "^3.0.3"
 
-object-inspect@^1.7.0:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.7.0.tgz#f4f6bd181ad77f006b5ece60bd0b6f398ff74a67"
-  integrity sha512-a7pEHdh1xKIAgTySUGgLMx/xwDZskN1Ud6egYYN3EdRW4ZMPNEDUTF+hwy2LUC+Bl+SyLXANnwz/jyh/qutKUw==
+object-inspect@^1.8.0:
+  version "1.9.0"
+  resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.9.0.tgz#c90521d74e1127b67266ded3394ad6116986533a"
+  integrity sha512-i3Bp9iTqwhaLZBxGkRfo5ZbE07BQRT7MGu8+nNgwW9ItGp1TzCTw2DLEoWwjClxBjOFI/hWljTAmYGCEwmtnOw==
 
 object-keys@^1.0.11, object-keys@^1.0.12, object-keys@^1.1.1:
   version "1.1.1"
@@ -6654,10 +6924,15 @@
     has-symbols "^1.0.0"
     object-keys "^1.0.11"
 
-object.entries-ponyfill@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/object.entries-ponyfill/-/object.entries-ponyfill-1.0.1.tgz#29abdf77cbfbd26566dd1aa24e9d88f65433d256"
-  integrity sha1-Kavfd8v70mVm3RqiTp2I9lQz0lY=
+object.assign@^4.1.1:
+  version "4.1.2"
+  resolved "https://registry.yarnpkg.com/object.assign/-/object.assign-4.1.2.tgz#0ed54a342eceb37b38ff76eb831a0e788cb63940"
+  integrity sha512-ixT2L5THXsApyiUPYKmW+2EHpXXe5Ii3M+f4e+aJFAHao5amFRW6J0OO6c/LU8Be47utCx2GL89hxGB6XSmKuQ==
+  dependencies:
+    call-bind "^1.0.0"
+    define-properties "^1.1.3"
+    has-symbols "^1.0.1"
+    object-keys "^1.1.1"
 
 object.omit@^2.0.0:
   version "2.0.1"
@@ -6674,14 +6949,14 @@
   dependencies:
     isobject "^3.0.1"
 
-object.values@^1.1.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/object.values/-/object.values-1.1.1.tgz#68a99ecde356b7e9295a3c5e0ce31dc8c953de5e"
-  integrity sha512-WTa54g2K8iu0kmS/us18jEmdv1a4Wi//BZ/DTVYEcH0XhLM5NYdpDHja3gt57VrZLcNAO2WGA+KpWsDBaHt6eA==
+object.values@^1.1.1:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/object.values/-/object.values-1.1.2.tgz#7a2015e06fcb0f546bd652486ce8583a4731c731"
+  integrity sha512-MYC0jvJopr8EK6dPBiO8Nb9mvjdypOachO5REGk6MXzujbBrAisKo3HmdEI6kZDL6fC31Mwee/5YbtMebixeag==
   dependencies:
+    call-bind "^1.0.0"
     define-properties "^1.1.3"
-    es-abstract "^1.17.0-next.1"
-    function-bind "^1.1.1"
+    es-abstract "^1.18.0-next.1"
     has "^1.0.3"
 
 obuf@^1.0.0, obuf@^1.1.1:
@@ -6730,10 +7005,10 @@
   dependencies:
     mimic-fn "^1.0.0"
 
-onetime@^5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/onetime/-/onetime-5.1.0.tgz#fff0f3c91617fe62bb50189636e99ac8a6df7be5"
-  integrity sha512-5NcSkPHhwTVFIQN+TUqXoS5+dlElHXdpAWu9I0HP20YOtIi+aZ0Ct82jdlILDxjLEAWwvm+qj1m6aEtsDVmm6Q==
+onetime@^5.1.0, onetime@^5.1.2:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/onetime/-/onetime-5.1.2.tgz#d0e96ebb56b07476df1dd9c4806e5237985ca45e"
+  integrity sha512-kbpaSSGJTWdAY5KPVeMOKXSrPtr8C8C7wodJbcsd51jRnmD+GZu8Y0VoU6Dm5Z4vWr0Ig/1NKuWRKf7j5aaYSg==
   dependencies:
     mimic-fn "^2.1.0"
 
@@ -6752,17 +7027,17 @@
     minimist "~0.0.1"
     wordwrap "~0.0.2"
 
-optionator@^0.8.3:
-  version "0.8.3"
-  resolved "https://registry.yarnpkg.com/optionator/-/optionator-0.8.3.tgz#84fa1d036fe9d3c7e21d99884b601167ec8fb495"
-  integrity sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==
+optionator@^0.9.1:
+  version "0.9.1"
+  resolved "https://registry.yarnpkg.com/optionator/-/optionator-0.9.1.tgz#4f236a6373dae0566a6d43e1326674f50c291499"
+  integrity sha512-74RlY5FCnhq4jRxVUPKDaRwrVNXMqsGsiW6AJw4XK8hmtm10wC0ypZBLw5IIp85NZMr91+qd1RvvENwg7jjRFw==
   dependencies:
-    deep-is "~0.1.3"
-    fast-levenshtein "~2.0.6"
-    levn "~0.3.0"
-    prelude-ls "~1.1.2"
-    type-check "~0.3.2"
-    word-wrap "~1.2.3"
+    deep-is "^0.1.3"
+    fast-levenshtein "^2.0.6"
+    levn "^0.4.1"
+    prelude-ls "^1.2.1"
+    type-check "^0.4.0"
+    word-wrap "^1.2.3"
 
 ordered-read-streams@^0.3.0:
   version "0.3.0"
@@ -6957,13 +7232,13 @@
     json-parse-better-errors "^1.0.1"
 
 parse-json@^5.0.0:
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-5.0.0.tgz#73e5114c986d143efa3712d4ea24db9a4266f60f"
-  integrity sha512-OOY5b7PAEFV0E2Fir1KOkxchnZNCdowAJgQ5NuxjpBKTRP3pQhwkrkxqQjeoKJ+fO7bCpmIZaogI4eZGDMEGOw==
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-5.1.0.tgz#f96088cdf24a8faa9aea9a009f2d9d942c999646"
+  integrity sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==
   dependencies:
     "@babel/code-frame" "^7.0.0"
     error-ex "^1.3.1"
-    json-parse-better-errors "^1.0.1"
+    json-parse-even-better-errors "^2.3.0"
     lines-and-columns "^1.1.6"
 
 parse-passwd@^1.0.0:
@@ -7089,6 +7364,11 @@
   dependencies:
     pify "^3.0.0"
 
+path-type@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
+  integrity sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==
+
 peek-stream@^1.1.0:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/peek-stream/-/peek-stream-1.1.3.tgz#3b35d84b7ccbbd262fff31dc10da56856ead6d67"
@@ -7118,6 +7398,11 @@
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
   integrity sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=
 
+picomatch@^2.0.5, picomatch@^2.2.1:
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.2.tgz#21f333e9b6b8eaff02468f5146ea406d345f4dad"
+  integrity sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==
+
 pify@^2.0.0, pify@^2.3.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
@@ -7441,10 +7726,10 @@
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
   integrity sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=
 
-prelude-ls@~1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
-  integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
+prelude-ls@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"
+  integrity sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==
 
 prepend-http@^1.0.1:
   version "1.0.4"
@@ -7468,11 +7753,16 @@
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@2.0.5, prettier@^2.0.4:
+prettier@2.0.5:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.5.tgz#d6d56282455243f2f92cc1716692c08aa31522d4"
   integrity sha512-7PtVymN48hGcO4fGjybyBSIWDsLU4H4XlvOHfq91pz9kkGlonzwTfYkaIEwiRg/dAJF9YlbsduBAgtYLi+8cFg==
 
+prettier@^2.1.2:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.2.1.tgz#795a1a78dd52f073da0cd42b21f9c91381923ff5"
+  integrity sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q==
+
 pretty-bytes@^4.0.2:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/pretty-bytes/-/pretty-bytes-4.0.2.tgz#b2bf82e7350d65c6c33aa95aaa5a4f6327f61cd9"
@@ -7578,10 +7868,10 @@
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
   integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
 
-pupa@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/pupa/-/pupa-2.0.1.tgz#dbdc9ff48ffbea4a26a069b6f9f7abb051008726"
-  integrity sha512-hEJH0s8PXLY/cdXh66tNEQGndDrIKNqNC5xmrysZy3i5C3oEoLna7YAOad+7u125+zH1HNXUmGEkrhb3c2VriA==
+pupa@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/pupa/-/pupa-2.1.1.tgz#f5e8fd4afc2c5d97828faa523549ed8744a20d62"
+  integrity sha512-l1jNAspIBSFqbT+y+5FosojNpVpF94nlI+wDUpqP9enwOTfHx9f0gh5nB96vl+6yTpsJsypeNrwfzPrKuHB41A==
   dependencies:
     escape-goat "^2.0.0"
 
@@ -7856,12 +8146,7 @@
     extend-shallow "^3.0.2"
     safe-regex "^1.1.0"
 
-regexpp@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-2.0.1.tgz#8d19d31cf632482b589049f8281f93dbcba4d07f"
-  integrity sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==
-
-regexpp@^3.0.0:
+regexpp@^3.0.0, regexpp@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.1.0.tgz#206d0ad0a5648cffbdb8ae46438f3dc51c9f78e2"
   integrity sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==
@@ -7878,10 +8163,10 @@
     unicode-match-property-ecmascript "^1.0.4"
     unicode-match-property-value-ecmascript "^1.1.0"
 
-regextras@^0.7.0:
-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/regextras/-/regextras-0.7.0.tgz#2298bef8cfb92b1b7e3b9b12aa8f69547b7d71e4"
-  integrity sha512-ds+fL+Vhl918gbAUb0k2gVKbTZLsg84Re3DI6p85Et0U0tYME3hyW4nMK8Px4dtDaBA2qNjvG5uWyW7eK5gfmw==
+regextras@^0.7.1:
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/regextras/-/regextras-0.7.1.tgz#be95719d5f43f9ef0b9fa07ad89b7c606995a3b2"
+  integrity sha512-9YXf6xtW+qzQ+hcMQXx95MOvfqXFgsKDZodX3qZB0x2n5Z94ioetIITsBtvJbiOyxa/6s9AtyweBLCdPmPko/w==
 
 registry-auth-token@^3.0.1:
   version "3.4.0"
@@ -7892,9 +8177,9 @@
     safe-buffer "^5.0.1"
 
 registry-auth-token@^4.0.0:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/registry-auth-token/-/registry-auth-token-4.1.1.tgz#40a33be1e82539460f94328b0f7f0f84c16d9479"
-  integrity sha512-9bKS7nTl9+/A1s7tnPeGrUpRcVY+LUh7bfFgzpndALdPfXQBfQV77rQVtqgUV3ti4vc/Ik81Ex8UJDWDQ12zQA==
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/registry-auth-token/-/registry-auth-token-4.2.1.tgz#6d7b4006441918972ccd5fedcd41dc322c79b250"
+  integrity sha512-6gkSb4U6aWJB4SF2ZvLb76yCBjcvufXBqvvEx1HbmKPkutswjW1xNVRY0+daljIYRbogN7O0etYSlbiaEQyMyw==
   dependencies:
     rc "^1.2.8"
 
@@ -8037,11 +8322,12 @@
   dependencies:
     path-parse "^1.0.6"
 
-resolve@^1.12.0, resolve@^1.13.1:
-  version "1.15.1"
-  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.15.1.tgz#27bdcdeffeaf2d6244b95bb0f9f4b4653451f3e8"
-  integrity sha512-84oo6ZTtoTUpjgNEr5SJyzQhzL72gaRodsSfyxC/AXRvwu0Yse9H8eF9IpGo7b8YetZhlI6v7ZQ6bKBFV/6S7w==
+resolve@^1.13.1, resolve@^1.17.0:
+  version "1.19.0"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.19.0.tgz#1af5bf630409734a067cae29318aac7fa29a267c"
+  integrity sha512-rArEXAgsBG4UgRGcynxWIWKFvh/XZCcS8UJdHhwy91zwAvCZIbcs+vAbflgBnNjYMs/i/i+/Ux6IZhML1yPvxg==
   dependencies:
+    is-core-module "^2.1.0"
     path-parse "^1.0.6"
 
 resolve@^1.5.0:
@@ -8087,7 +8373,12 @@
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
   integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
 
-rimraf@2.6.3, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@~2.6.2:
+reusify@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.0.4.tgz#90da382b1e126efc02146e90845a88db12925d76"
+  integrity sha512-U9nH88a3fc/ekCF1l0/UP1IosiuIjyTh7hBvXVMHYgVcfGvt897Xguj2UOLDeI5BG2m7/uwyaLVT6fbtCwTyzw==
+
+rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@~2.6.2:
   version "2.6.3"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.3.tgz#b2d104fe0d8fb27cf9e0a1cda8262dd3833c6cab"
   integrity sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==
@@ -8122,6 +8413,13 @@
     "@types/node" "^12.0.10"
     acorn "^6.1.1"
 
+rollup@^2.3.4:
+  version "2.35.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.35.1.tgz#e6bc8d10893556a638066f89e8c97f422d03968c"
+  integrity sha512-q5KxEyWpprAIcainhVy6HfRttD9kutQpHbeqDTWnqAFNJotiojetK6uqmcydNMymBEtC4I8bCYR+J3mTMqeaUA==
+  optionalDependencies:
+    fsevents "~2.1.2"
+
 run-async@^2.0.0, run-async@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/run-async/-/run-async-2.3.0.tgz#0371ab4ae0bdd720d4166d7dfda64ff7a445a6c0"
@@ -8134,6 +8432,11 @@
   resolved "https://registry.yarnpkg.com/run-async/-/run-async-2.4.1.tgz#8440eccf99ea3e70bd409d49aab88e10c189a455"
   integrity sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==
 
+run-parallel@^1.1.9:
+  version "1.1.10"
+  resolved "https://registry.yarnpkg.com/run-parallel/-/run-parallel-1.1.10.tgz#60a51b2ae836636c81377df16cb107351bcd13ef"
+  integrity sha512-zb/1OuZ6flOlH6tQyMPUrE3x3Ulxjlo9WIVXR4yVYi4H9UXQaeIsPbLn2R3O3vQCnDKkAl2qHiuocKKX4Tz/Sw==
+
 rx@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/rx/-/rx-4.1.0.tgz#a5f13ff79ef3b740fe30aa803fb09f98805d4782"
@@ -8146,10 +8449,10 @@
   dependencies:
     tslib "^1.9.0"
 
-rxjs@^6.5.3:
-  version "6.5.4"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.5.4.tgz#e0777fe0d184cec7872df147f303572d414e211c"
-  integrity sha512-naMQXcgEo3csAEGvw/NydRA0fuS2nDZJiw1YUWFKU7aPPAPGZEsD4Iimit96qwCieH6y614MCLYwdkrWx7z/7Q==
+rxjs@^6.6.0:
+  version "6.6.3"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.6.3.tgz#8ca84635c4daa900c0d3967a6ee7ac60271ee552"
+  integrity sha512-trsQc+xYYXZ3urjOiJOuCOa5N3jAZ3eiSpQB5hIT8zGlL2QfnHLJ2r7GMkBGuIausdJN1OneaI6gQlsqNHHmZQ==
   dependencies:
     tslib "^1.9.0"
 
@@ -8249,11 +8552,18 @@
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.6.0.tgz#7e74256fbaa49c75aa7c7a205cc22799cac80004"
   integrity sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==
 
-semver@^6.0.0, semver@^6.1.0, semver@^6.1.2, semver@^6.2.0, semver@^6.3.0:
+semver@^6.0.0, semver@^6.1.0, semver@^6.2.0, semver@^6.3.0:
   version "6.3.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
+semver@^7.2.1, semver@^7.3.2, semver@^7.3.4:
+  version "7.3.4"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.4.tgz#27aaa7d2e4ca76452f98d3add093a72c943edc97"
+  integrity sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==
+  dependencies:
+    lru-cache "^6.0.0"
+
 send@0.17.1:
   version "0.17.1"
   resolved "https://registry.yarnpkg.com/send/-/send-0.17.1.tgz#c1d8b059f7900f7466dd4938bdc44e11ddb376c8"
@@ -8380,6 +8690,11 @@
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
   integrity sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=
 
+signal-exit@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.3.tgz#a1410c2edd8f077b08b4e253c8eacfcaf057461c"
+  integrity sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==
+
 simple-swizzle@^0.2.2:
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/simple-swizzle/-/simple-swizzle-0.2.2.tgz#a4da6b635ffcccca33f70d17cb92592de95e557a"
@@ -8411,14 +8726,19 @@
   resolved "https://registry.yarnpkg.com/slash/-/slash-1.0.0.tgz#c41f2f6c39fc16d1cd17ad4b5d896114ae470d55"
   integrity sha1-xB8vbDn8FtHNF61LXYlhFK5HDVU=
 
-slice-ansi@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-2.1.0.tgz#cacd7693461a637a5788d92a7dd4fba068e81636"
-  integrity sha512-Qu+VC3EwYLldKa1fCxuuvULvSJOKEgk9pi8dZeCVK7TqBfUNTH4sFkk4joj8afVSfAYgJoSOetjx9QWOJ5mYoQ==
+slash@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"
+  integrity sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==
+
+slice-ansi@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-4.0.0.tgz#500e8dd0fd55b05815086255b3195adf2a45fe6b"
+  integrity sha512-qMCMfhY040cVHT43K9BFygqYbUPFZKHOg7K73mtTWJRb8pyP3fzf4Ixd5SzdEJQ6MRUg/WBnOLxghZtKKurENQ==
   dependencies:
-    ansi-styles "^3.2.0"
-    astral-regex "^1.0.0"
-    is-fullwidth-code-point "^2.0.0"
+    ansi-styles "^4.0.0"
+    astral-regex "^2.0.0"
+    is-fullwidth-code-point "^3.0.0"
 
 slide@^1.1.5:
   version "1.1.6"
@@ -8595,6 +8915,14 @@
     spdx-exceptions "^2.1.0"
     spdx-license-ids "^3.0.0"
 
+spdx-expression-parse@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/spdx-expression-parse/-/spdx-expression-parse-3.0.1.tgz#cf70f50482eefdc98e3ce0a6833e4a53ceeba679"
+  integrity sha512-cbqHunsQWnJNE6KhVSMsMeH5H/L9EpymbzqTQ3uLwNCLZ1Q481oWaofqH7nO6V07xlXwY6PhQdQ2IedWx/ZK4Q==
+  dependencies:
+    spdx-exceptions "^2.1.0"
+    spdx-license-ids "^3.0.0"
+
 spdx-license-ids@^3.0.0:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/spdx-license-ids/-/spdx-license-ids-3.0.4.tgz#75ecd1a88de8c184ef015eafb51b5b48bfd11bb1"
@@ -8736,7 +9064,7 @@
     is-fullwidth-code-point "^2.0.0"
     strip-ansi "^5.1.0"
 
-string-width@^4.0.0, string-width@^4.1.0:
+string-width@^4.0.0, string-width@^4.1.0, string-width@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/string-width/-/string-width-4.2.0.tgz#952182c46cc7b2c313d1596e623992bd163b72b5"
   integrity sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==
@@ -8745,21 +9073,21 @@
     is-fullwidth-code-point "^3.0.0"
     strip-ansi "^6.0.0"
 
-string.prototype.trimleft@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/string.prototype.trimleft/-/string.prototype.trimleft-2.1.1.tgz#9bdb8ac6abd6d602b17a4ed321870d2f8dcefc74"
-  integrity sha512-iu2AGd3PuP5Rp7x2kEZCrB2Nf41ehzh+goo8TV7z8/XDBbsvc6HQIlUl9RjkZ4oyrW1XM5UwlGl1oVEaDjg6Ag==
+string.prototype.trimend@^1.0.1:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/string.prototype.trimend/-/string.prototype.trimend-1.0.3.tgz#a22bd53cca5c7cf44d7c9d5c732118873d6cd18b"
+  integrity sha512-ayH0pB+uf0U28CtjlLvL7NaohvR1amUvVZk+y3DYb0Ey2PUV5zPkkKy9+U1ndVEIXO8hNg18eIv9Jntbii+dKw==
   dependencies:
+    call-bind "^1.0.0"
     define-properties "^1.1.3"
-    function-bind "^1.1.1"
 
-string.prototype.trimright@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/string.prototype.trimright/-/string.prototype.trimright-2.1.1.tgz#440314b15996c866ce8a0341894d45186200c5d9"
-  integrity sha512-qFvWL3/+QIgZXVmJBfpHmxLB7xsUXz6HsUmP8+5dRaC3Q7oKUv9Vo6aMCRZC1smrtyECFsIT30PqBJ1gTjAs+g==
+string.prototype.trimstart@^1.0.1:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/string.prototype.trimstart/-/string.prototype.trimstart-1.0.3.tgz#9b4cb590e123bb36564401d59824298de50fd5aa"
+  integrity sha512-oBIBUy5lea5tt0ovtOFiEQaBkoBBkyJhZXzJYrSmDo5IUUqbOPvVezuRs/agBIdZ2p2Eo1FD6bD9USyBLfl3xg==
   dependencies:
+    call-bind "^1.0.0"
     define-properties "^1.1.3"
-    function-bind "^1.1.1"
 
 string_decoder@^1.1.1:
   version "1.3.0"
@@ -8794,7 +9122,7 @@
   dependencies:
     ansi-regex "^3.0.0"
 
-strip-ansi@^5.1.0, strip-ansi@^5.2.0:
+strip-ansi@^5.1.0:
   version "5.2.0"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-5.2.0.tgz#8c9a536feb6afc962bdfa5b104a5091c1ad9c0ae"
   integrity sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==
@@ -8870,10 +9198,10 @@
   dependencies:
     min-indent "^1.0.0"
 
-strip-json-comments@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-3.0.1.tgz#85713975a91fb87bf1b305cca77395e40d2a64a7"
-  integrity sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==
+strip-json-comments@^3.1.0, strip-json-comments@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-3.1.1.tgz#31f1281b3832630434831c310c01cccda8cbe006"
+  integrity sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==
 
 strip-json-comments@~2.0.1:
   version "2.0.1"
@@ -8934,15 +9262,15 @@
     typical "^2.6.1"
     wordwrapjs "^3.0.0"
 
-table@^5.2.3:
-  version "5.4.6"
-  resolved "https://registry.yarnpkg.com/table/-/table-5.4.6.tgz#1292d19500ce3f86053b05f0e8e7e4a3bb21079e"
-  integrity sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==
+table@^6.0.4:
+  version "6.0.4"
+  resolved "https://registry.yarnpkg.com/table/-/table-6.0.4.tgz#c523dd182177e926c723eb20e1b341238188aa0d"
+  integrity sha512-sBT4xRLdALd+NFBvwOz8bw4b15htyythha+q+DVZqy2RS08PPC8O2sZFgJYEY7bJvbCFKccs+WIZ/cd+xxTWCw==
   dependencies:
-    ajv "^6.10.2"
-    lodash "^4.17.14"
-    slice-ansi "^2.1.0"
-    string-width "^3.0.0"
+    ajv "^6.12.4"
+    lodash "^4.17.20"
+    slice-ansi "^4.0.0"
+    string-width "^4.2.0"
 
 tar-fs@^1.12.0:
   version "1.16.3"
@@ -9025,9 +9353,9 @@
     execa "^0.7.0"
 
 term-size@^2.1.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/term-size/-/term-size-2.2.0.tgz#1f16adedfe9bdc18800e1776821734086fcc6753"
-  integrity sha512-a6sumDlzyHVJWb8+YofY4TW112G6p2FCPEAFk+59gIYHv3XHRhm9ltVQ9kli4hNWeQBwSpe8cRN25x0ROunMOw==
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/term-size/-/term-size-2.2.1.tgz#2a6a54840432c2fb6320fea0f415531e90189f54"
+  integrity sha512-wK0Ri4fOGjv/XPy8SBHZChl8CM7uMc5VML7SqiQ0zG7+J5Vr+RMQDoHa2CNT6KHUnTGIXH34UDMkPzAUyapBZg==
 
 ternary-stream@^2.0.1:
   version "2.0.1"
@@ -9197,6 +9525,13 @@
     is-number "^3.0.0"
     repeat-string "^1.6.1"
 
+to-regex-range@^5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/to-regex-range/-/to-regex-range-5.0.1.tgz#1648c44aae7c8d988a326018ed72f5b4dd0392e4"
+  integrity sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==
+  dependencies:
+    is-number "^7.0.0"
+
 to-regex@^3.0.1, to-regex@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/to-regex/-/to-regex-3.0.2.tgz#13cfdd9b336552f30b51f33a8ae1b42a7a7599ce"
@@ -9247,6 +9582,16 @@
   resolved "https://registry.yarnpkg.com/triple-beam/-/triple-beam-1.3.0.tgz#a595214c7298db8339eeeee083e4d10bd8cb8dd9"
   integrity sha512-XrHUvV5HpdLmIj4uVMxHggLbFSZYIn7HEWsqePZcI50pco+MPqJ50wMGY794X7AOOhxOBAjbkqfAbEe/QMp2Lw==
 
+tsconfig-paths@^3.9.0:
+  version "3.9.0"
+  resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz#098547a6c4448807e8fcb8eae081064ee9a3c90b"
+  integrity sha512-dRcuzokWhajtZWkQsDVKbWyY+jgcLC5sqJhg2PSgf4ZkH2aHPvaOY8YWGhmjb68b5qqTfasSsDO9k7RUiEmZAw==
+  dependencies:
+    "@types/json5" "^0.0.29"
+    json5 "^1.0.1"
+    minimist "^1.2.0"
+    strip-bom "^3.0.0"
+
 tslib@^1.8.1:
   version "1.13.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.13.0.tgz#c881e13cc7015894ed914862d276436fa9a47043"
@@ -9283,22 +9628,27 @@
   resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
   integrity sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=
 
-type-check@~0.3.2:
-  version "0.3.2"
-  resolved "https://registry.yarnpkg.com/type-check/-/type-check-0.3.2.tgz#5884cab512cf1d355e3fb784f30804b2b520db72"
-  integrity sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=
+type-check@^0.4.0, type-check@~0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/type-check/-/type-check-0.4.0.tgz#07b8203bfa7056c0657050e3ccd2c37730bab8f1"
+  integrity sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==
   dependencies:
-    prelude-ls "~1.1.2"
+    prelude-ls "^1.2.1"
 
 type-detect@^4.0.0:
   version "4.0.8"
   resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"
   integrity sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==
 
-type-fest@^0.13.1:
-  version "0.13.1"
-  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.13.1.tgz#0172cb5bce80b0bd542ea348db50c7e21834d934"
-  integrity sha512-34R7HTnG0XIJcBSn5XhDd7nNFPRcXYRZrBB2O2jdKqYODldSzBAqzsWoZYYvduky73toYS/ESqxPvkDf/F0XMg==
+type-fest@^0.11.0:
+  version "0.11.0"
+  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.11.0.tgz#97abf0872310fed88a5c466b25681576145e33f1"
+  integrity sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==
+
+type-fest@^0.18.0:
+  version "0.18.1"
+  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.18.1.tgz#db4bc151a4a2cf4eebf9add5db75508db6cc841f"
+  integrity sha512-OIAYXk8+ISY+qTOwkHtKqzAuxchoMiD9Udx+FSGQDuiRR+PJKJHc2NJAXlbhkGwTt/4/nKZxELY1w3ReWOL8mw==
 
 type-fest@^0.6.0:
   version "0.6.0"
@@ -9330,10 +9680,10 @@
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@3.9.5:
-  version "3.9.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.5.tgz#586f0dba300cde8be52dd1ac4f7e1009c1b13f36"
-  integrity sha512-hSAifV3k+i6lEoCJ2k6R2Z/rp/H3+8sdmcn5NrS3/3kE7+RyZXm9aqvxWqjEXHAd8b0pShatpcdMTvEdvAJltQ==
+typescript@4.0.5:
+  version "4.0.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.5.tgz#ae9dddfd1069f1cb5beb3ef3b2170dd7c1332389"
+  integrity sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==
 
 typical@^2.6.1:
   version "2.6.1"
@@ -9495,22 +9845,23 @@
     semver-diff "^2.0.0"
     xdg-basedir "^3.0.0"
 
-update-notifier@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/update-notifier/-/update-notifier-4.1.0.tgz#4866b98c3bc5b5473c020b1250583628f9a328f3"
-  integrity sha512-w3doE1qtI0/ZmgeoDoARmI5fjDoT93IfKgEGqm26dGUOh8oNpaSTsGNdYRN/SjOuo10jcJGwkEL3mroKzktkew==
+update-notifier@^5.0.0:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/update-notifier/-/update-notifier-5.0.1.tgz#1f92d45fb1f70b9e33880a72dd262bc12d22c20d"
+  integrity sha512-BuVpRdlwxeIOvmc32AGYvO1KVdPlsmqSh8KDDBxS6kDE5VR7R8OMP1d8MdhaVBvxl4H3551k9akXr0Y1iIB2Wg==
   dependencies:
     boxen "^4.2.0"
-    chalk "^3.0.0"
+    chalk "^4.1.0"
     configstore "^5.0.1"
     has-yarn "^2.1.0"
     import-lazy "^2.1.0"
     is-ci "^2.0.0"
-    is-installed-globally "^0.3.1"
-    is-npm "^4.0.0"
+    is-installed-globally "^0.3.2"
+    is-npm "^5.0.0"
     is-yarn-global "^0.3.0"
-    latest-version "^5.0.0"
-    pupa "^2.0.1"
+    latest-version "^5.1.0"
+    pupa "^2.1.1"
+    semver "^7.3.2"
     semver-diff "^3.1.1"
     xdg-basedir "^4.0.0"
 
@@ -9881,7 +10232,7 @@
     p-try "^2.1.0"
     pify "^4.0.1"
 
-word-wrap@~1.2.3:
+word-wrap@^1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/word-wrap/-/word-wrap-1.2.3.tgz#610636f6b1f703891bd34771ccb17fb93b47079c"
   integrity sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==
@@ -9932,13 +10283,6 @@
     signal-exit "^3.0.2"
     typedarray-to-buffer "^3.1.5"
 
-write@1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/write/-/write-1.0.3.tgz#0800e14523b923a387e415123c865616aae0f5c3"
-  integrity sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==
-  dependencies:
-    mkdirp "^0.5.1"
-
 ws@^7.1.2:
   version "7.2.1"
   resolved "https://registry.yarnpkg.com/ws/-/ws-7.2.1.tgz#03ed52423cd744084b2cf42ed197c8b65a936b8e"
@@ -9998,13 +10342,15 @@
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.3.tgz#b4b049e314be545e3ce802236d6cd22cd91c3de9"
   integrity sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==
 
-yargs-parser@^18.1.3:
-  version "18.1.3"
-  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-18.1.3.tgz#be68c4975c6b2abf469236b0c870362fab09a7b0"
-  integrity sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==
-  dependencies:
-    camelcase "^5.0.0"
-    decamelize "^1.2.0"
+yallist@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-4.0.0.tgz#9bb92790d9c0effec63be73519e11a35019a3a72"
+  integrity sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==
+
+yargs-parser@^20.2.3:
+  version "20.2.4"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-20.2.4.tgz#b42890f14566796f85ae8e3a25290d205f154a54"
+  integrity sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==
 
 yauzl@^2.10.0:
   version "2.10.0"