Merge changes I7216e8d8,I99a4cf9c,I7a05807d into stable-3.4

* changes:
  Add a section on reducing the impacts of Git gc
  Add a section about the impacts of Git gc
  Add a repository-maintenance doc
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 1052c8e..5f2ea09 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -604,7 +604,14 @@
 By default this is set to `LDAP` when link:#auth.type[`auth.type`] is `LDAP`
 and `OAUTH` when link:#auth.type[`auth.type`] is `OAUTH`.
 Otherwise, the default value is `HTTP`.
-
++
+When gitBasicAuthPolicy is set to `LDAP` or `HTTP_LDAP` and the user
+is authenticating with the LDAP username/password, the Git client config
+needs to have `http.cookieFile` set to a local file, otherwise every
+single call would trigger a full LDAP authentication and groups resolution
+which could introduce a noticeable latency on the overall execution
+and produce unwanted load to the LDAP server.
++
 [[auth.gitOAuthProvider]]auth.gitOAuthProvider::
 +
 Selects the OAuth 2 provider to authenticate git over HTTP traffic with.
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--- a/Documentation/images/user-review-ui-change-screen-quick-approve.png
+++ b/Documentation/images/user-review-ui-change-screen-quick-approve.png
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index b599f6d..0000000
--- a/Documentation/images/user-review-ui-side-by-side-diff-screen-column.png
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index ea14a21..1eb7665 100644
--- a/Documentation/images/user-review-ui-side-by-side-diff-screen-expand-skipped-lines.png
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index 8406ce8..66c46b7 100644
--- a/Documentation/images/user-review-ui-side-by-side-diff-screen-file-level-comment.png
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diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
index 06c5ab7..156ea02 100644
--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -12,7 +12,7 @@
 The change screen shows the details of a single change and provides
 various actions on it.
 
-image::images/user-review-ui-change-screen.png[width=800, link="images/user-review-ui-change-screen.png"]
+image::images/gwt-user-review-ui-change-screen.png[width=800, link="images/gwt-user-review-ui-change-screen.png"]
 
 [[commit-message]]
 === Commit Message Block
@@ -21,14 +21,14 @@
 the most important information about a change. The numeric change ID
 and the change status are displayed right above the commit message.
 
-image::images/user-review-ui-change-screen-commit-message.png[width=800, link="images/user-review-ui-change-screen-commit-message.png"]
+image::images/gwt-user-review-ui-change-screen-commit-message.png[width=800, link="images/gwt-user-review-ui-change-screen-commit-message.png"]
 
 [[permalink]]
 The numeric change ID is a link to the change and clicking on it
 refreshes the change screen. By copying the link location you can get
 the permalink of the change.
 
-image::images/user-review-ui-change-screen-permalink.png[width=800, link="images/user-review-ui-change-screen-permalink.png"]
+image::images/gwt-user-review-ui-change-screen-permalink.png[width=800, link="images/gwt-user-review-ui-change-screen-permalink.png"]
 
 [[change-status]]
 The change status shows the state of the change:
@@ -79,11 +79,11 @@
 If a Git web browser, such as gitweb or Gitiles, is configured, there
 is also a link to the commit in the Git web browser.
 
-image::images/user-review-ui-change-screen-commit-info.png[width=800, link="images/user-review-ui-change-screen-commit-info.png"]
+image::images/gwt-user-review-ui-change-screen-commit-info.png[width=800, link="images/gwt-user-review-ui-change-screen-commit-info.png"]
 
 If a merge commit is viewed this is highlighted by an icon.
 
-image::images/user-review-ui-change-screen-commit-info-merge-commit.png[width=800, link="images/user-review-ui-change-screen-commit-info-merge-commit.png"]
+image::images/gwt-user-review-ui-change-screen-commit-info-merge-commit.png[width=800, link="images/gwt-user-review-ui-change-screen-commit-info-merge-commit.png"]
 
 [[change-info]]
 === Change Info Block
@@ -91,14 +91,7 @@
 The change info block contains detailed information about the change
 and offers actions on the change.
 
-image::images/user-review-ui-change-screen-change-info.png[width=800, link="images/user-review-ui-change-screen-change-info.png"]
-
-- [[change-owner]]Change Owner:
-+
-The owner of the change is displayed as a link to a list of the owner's
-changes that have the same status as the currently viewed change.
-+
-image::images/user-review-ui-change-screen-change-info-owner.png[width=800, link="images/user-review-ui-change-screen-change-info-owner.png"]
+image::images/gwt-user-review-ui-change-screen-change-info.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info.png"]
 
 - [[reviewers]]Reviewers:
 +
@@ -126,7 +119,7 @@
    and Gerrit administrators may remove anyone.
 
 +
-image::images/user-review-ui-change-screen-change-info-reviewers.png[width=800, link="images/user-review-ui-change-screen-change-info-reviewers.png"]
+image::images/gwt-user-review-ui-change-screen-change-info-reviewers.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info-reviewers.png"]
 
 - [[project-branch-topic]]Project / Branch / Topic:
 +
@@ -148,7 +141,7 @@
 access right. To be able to set a topic on a closed change, the
 `Edit Topic Name` must be assigned with the `force` flag.
 +
-image::images/user-review-ui-change-screen-change-info-project-branch-topic.png[width=800, link="images/user-review-ui-change-screen-change-info-project-branch-topic.png"]
+image::images/gwt-user-review-ui-change-screen-change-info-project-branch-topic.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info-project-branch-topic.png"]
 
 - [[submit-strategy]]Submit Strategy:
 +
@@ -156,16 +149,12 @@
 used to submit the change. The submit strategy is only displayed for
 open changes.
 +
-image::images/user-review-ui-change-screen-change-info-submit-strategy.png[width=800, link="images/user-review-ui-change-screen-change-info-submit-strategy.png"]
+image::images/gwt-user-review-ui-change-screen-change-info-submit-strategy.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info-submit-strategy.png"]
 +
 If a change cannot be merged due to path conflicts this is highlighted
 by a bold red `Cannot Merge` label.
 +
-image::images/user-review-ui-change-screen-change-info-cannot-merge.png[width=800, link="images/user-review-ui-change-screen-change-info-cannot-merge.png"]
-
-- [[update-time]]Time of Last Update:
-+
-image::images/user-review-ui-change-screen-change-info-last-update.png[width=800, link="images/user-review-ui-change-screen-change-info-last-update.png"]
+image::images/gwt-user-review-ui-change-screen-change-info-cannot-merge.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info-cannot-merge.png"]
 
 - [[actions]]Actions:
 +
@@ -266,13 +255,13 @@
 ** [[plugin-actions]]Further actions may be available if plugins are installed.
 
 +
-image::images/user-review-ui-change-screen-change-info-actions.png[width=800, link="images/user-review-ui-change-screen-change-info-actions.png"]
+image::images/gwt-user-review-ui-change-screen-change-info-actions.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info-actions.png"]
 
 - [[labels]]Labels & Votes:
 +
 Approving votes are colored green; veto votes are colored red.
 +
-image::images/user-review-ui-change-screen-change-info-labels.png[width=800, link="images/user-review-ui-change-screen-change-info-labels.png"]
+image::images/gwt-user-review-ui-change-screen-change-info-labels.png[width=800, link="images/gwt-user-review-ui-change-screen-change-info-labels.png"]
 
 [[files]]
 === File List
@@ -280,7 +269,7 @@
 The file list shows the files that are modified in the currently viewed
 patch set.
 
-image::images/user-review-ui-change-screen-file-list.png[width=800, link="images/user-review-ui-change-screen-file-list.png"]
+image::images/gwt-user-review-ui-change-screen-file-list.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list.png"]
 
 [[magic-files]]
 In addition to the modified files the file list contains magic files
@@ -302,7 +291,7 @@
 [[change-screen-mark-reviewed]]
 The checkboxes in front of the file names allow files to be marked as reviewed.
 
-image::images/user-review-ui-change-screen-file-list-mark-as-reviewed.png[width=800, link="images/user-review-ui-change-screen-file-list-mark-as-reviewed.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-mark-as-reviewed.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-mark-as-reviewed.png"]
 
 [[modification-type]]
 The type of a file modification is indicated by the character in front
@@ -335,18 +324,18 @@
 comments on at least one of the sides. Otherwise unchanged files are
 filtered out.
 
-image::images/user-review-ui-change-screen-file-list-modification-type.png[width=800, link="images/user-review-ui-change-screen-file-list-modification-type.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-modification-type.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-modification-type.png"]
 
 [[rename-or-copy]]
 If a file is renamed or copied, the name of the original file is
 displayed in gray below the file name.
 
-image::images/user-review-ui-change-screen-file-list-rename.png[width=800, link="images/user-review-ui-change-screen-file-list-rename.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-rename.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-rename.png"]
 
 [[repeating-path-segments]]
 Repeating path segments are grayed out.
 
-image::images/user-review-ui-change-screen-file-list-repeating-paths.png[width=800, link="images/user-review-ui-change-screen-file-list-repeating-paths.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-repeating-paths.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-repeating-paths.png"]
 
 [[inline-comments-column]]
 Inline comments on a file are shown in the `Comments` column.
@@ -357,7 +346,7 @@
 New comments from other users, that were published after the current
 user last reviewed this change, are highlighted in bold.
 
-image::images/user-review-ui-change-screen-file-list-comments.png[width=800, link="images/user-review-ui-change-screen-file-list-comments.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-comments.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-comments.png"]
 
 [[size]]
 The size of the modifications in the files can be seen in the `Size` column. The
@@ -380,7 +369,7 @@
 shows the total number of lines in the new file. No size is shown for binary
 files and deleted files.
 
-image::images/user-review-ui-change-screen-file-list-size.png[width=800, link="images/user-review-ui-change-screen-file-list-size.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-size.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-size.png"]
 
 [[diff-against]]
 In the header of the file list, the `Diff Against` selection can be
@@ -392,7 +381,7 @@
 The file list header also provides an `Open All` button that opens the
 diff views for all files in the file list.
 
-image::images/user-review-ui-change-screen-file-list-header.png[width=800, link="images/user-review-ui-change-screen-file-list-header.png"]
+image::images/gwt-user-review-ui-change-screen-file-list-header.png[width=800, link="images/gwt-user-review-ui-change-screen-file-list-header.png"]
 
 [[patch-sets]]
 === Patch Sets
@@ -407,11 +396,11 @@
 link:#not-current[Not Current] change state. Please note that some
 operations are only available on the current patch set.
 
-image::images/user-review-ui-change-screen-patch-sets.png[width=800, link="images/user-review-ui-change-screen-patch-sets.png"]
+image::images/gwt-user-review-ui-change-screen-patch-sets.png[width=800, link="images/gwt-user-review-ui-change-screen-patch-sets.png"]
 
 Another indication is a highlighted drop-down label.
 
-image::images/user-review-ui-change-screen-not-current.png[width=800, link="images/user-review-ui-change-screen-not-current.png"]
+image::images/gwt-user-review-ui-change-screen-not-current.png[width=800, link="images/gwt-user-review-ui-change-screen-not-current.png"]
 
 [[patch-set-drop-down]]
 The patch set drop-down list shows the list of patch sets and allows to
@@ -420,7 +409,7 @@
 
 Draft patch sets are marked with `DRAFT`.
 
-image::images/user-review-ui-change-screen-patch-set-list.png[width=800, link="images/user-review-ui-change-screen-patch-set-list.png"]
+image::images/gwt-user-review-ui-change-screen-patch-set-list.png[width=800, link="images/gwt-user-review-ui-change-screen-patch-set-list.png"]
 
 [[download]]
 === Download
@@ -428,7 +417,7 @@
 The `Download` drop-down panel in the change header offers commands and
 links for downloading the currently viewed patch set.
 
-image::images/user-review-ui-change-screen-download-commands.png[width=800, link="images/user-review-ui-change-screen-download-commands.png"]
+image::images/gwt-user-review-ui-change-screen-download-commands.png[width=800, link="images/gwt-user-review-ui-change-screen-download-commands.png"]
 
 The available download commands depend on the installed Gerrit plugins.
 The most popular plugin for download commands, the
@@ -455,7 +444,7 @@
 formats (e.g. tar and tbz2); which formats are available depends on the
 configuration of the server.
 
-image::images/user-review-ui-change-screen-download-commands-list.png[width=800, link="images/user-review-ui-change-screen-download-commands-list.png"]
+image::images/gwt-user-review-ui-change-screen-download-commands-list.png[width=800, link="images/gwt-user-review-ui-change-screen-download-commands-list.png"]
 
 [[included-in]]
 === Included In
@@ -463,14 +452,14 @@
 For merged changes the `Included In` drop-down panel is available in
 the change header.
 
-image::images/user-review-ui-change-screen-included-in.png[width=800, link="images/user-review-ui-change-screen-included-in.png"]
+image::images/gwt-user-review-ui-change-screen-included-in.png[width=800, link="images/gwt-user-review-ui-change-screen-included-in.png"]
 
 The `Included In` drop-down panel shows the branches and tags in which
 the change is included. E.g. if a change fixes a bug, this allows to
 quickly see in which released versions the bug-fix is contained
 (assuming that every release is tagged).
 
-image::images/user-review-ui-change-screen-included-in-list.png[width=800, link="images/user-review-ui-change-screen-included-in-list.png"]
+image::images/gwt-user-review-ui-change-screen-included-in-list.png[width=800, link="images/gwt-user-review-ui-change-screen-included-in-list.png"]
 
 [[star]]
 === Star Change
@@ -478,7 +467,7 @@
 The star icon in the change header allows to mark the change as a
 favorite. Clicking on the star icon again, unstars the change.
 
-image::images/user-review-ui-change-screen-star.png[width=800, link="images/user-review-ui-change-screen-star.png"]
+image::images/gwt-user-review-ui-change-screen-star.png[width=800, link="images/gwt-user-review-ui-change-screen-star.png"]
 
 Starring a change turns on email notifications for this change.
 
@@ -513,7 +502,7 @@
 For merged changes this tab is only shown if there are open
 descendants.
 +
-image::images/user-review-ui-change-screen-related-changes.png[width=800, link="images/user-review-ui-change-screen-related-changes.png"]
+image::images/gwt-user-review-ui-change-screen-related-changes.png[width=800, link="images/gwt-user-review-ui-change-screen-related-changes.png"]
 +
 Related changes may be decorated with an icon to signify dependencies
 on outdated patch sets, or commits that are not associated to changes
@@ -560,7 +549,7 @@
 through.
 
 +
-image::images/user-review-ui-change-screen-related-changes-indicators.png[width=800, link="images/user-review-ui-change-screen-related-changes-indicators.png"]
+image::images/gwt-user-review-ui-change-screen-related-changes-indicators.png[width=800, link="images/gwt-user-review-ui-change-screen-related-changes-indicators.png"]
 
 - [[conflicts-with]]`Conflicts With`:
 +
@@ -572,14 +561,14 @@
 conflicts and must be rebased. The rebase of the other changes with the
 conflict resolution must then be done manually.
 +
-image::images/user-review-ui-change-screen-conflicts-with.png[width=800, link="images/user-review-ui-change-screen-conflicts-with.png"]
+image::images/gwt-user-review-ui-change-screen-conflicts-with.png[width=800, link="images/gwt-user-review-ui-change-screen-conflicts-with.png"]
 
 - [[same-topic]]`Same Topic`:
 +
 This tab page shows changes that have the same topic as the current
 change. Only open changes are included in the list.
 +
-image::images/user-review-ui-change-screen-same-topic.png[width=800, link="images/user-review-ui-change-screen-same-topic.png"]
+image::images/gwt-user-review-ui-change-screen-same-topic.png[width=800, link="images/gwt-user-review-ui-change-screen-same-topic.png"]
 
 - [[submitted-together]]`Submitted Together`:
 +
@@ -602,7 +591,7 @@
 For each change in this list the destination branch is shown as a
 prefix in front of the change subject.
 +
-image::images/user-review-ui-change-screen-cherry-picks.png[width=800, link="images/user-review-ui-change-screen-cherry-picks.png"]
+image::images/gwt-user-review-ui-change-screen-cherry-picks.png[width=800, link="images/gwt-user-review-ui-change-screen-cherry-picks.png"]
 
 If there are no related changes for a tab, the tab is not displayed.
 
@@ -613,7 +602,7 @@
 currently viewed patch set; one can add a summary comment, publish
 inline draft comments, and vote on the labels.
 
-image::images/user-review-ui-change-screen-reply.png[width=800, link="images/user-review-ui-change-screen-reply.png"]
+image::images/gwt-user-review-ui-change-screen-reply.png[width=800, link="images/gwt-user-review-ui-change-screen-reply.png"]
 
 Clicking on the `Reply...` button opens a popup panel.
 
@@ -639,7 +628,7 @@
 
 The `Post` button publishes the comments and the votes.
 
-image::images/user-review-ui-change-screen-replying.png[width=800, link="images/user-review-ui-change-screen-replying.png"]
+image::images/gwt-user-review-ui-change-screen-replying.png[width=800, link="images/gwt-user-review-ui-change-screen-replying.png"]
 
 [[quick-approve]]
 If a user can approve a label that is still required, a quick approve
@@ -658,7 +647,7 @@
 comments; a summary comment is only added if the reply popup panel is
 open when the quick approve button is clicked.
 
-image::images/user-review-ui-change-screen-quick-approve.png[width=800, link="images/user-review-ui-change-screen-quick-approve.png"]
+image::images/user-review-ui-change-screen-quick-approve.png[width=800, link="images/gwt-user-review-ui-change-screen-quick-approve.png"]
 
 [[history]]
 === History
@@ -672,7 +661,7 @@
 Messages with new comments from other users, that were published after
 the current user last reviewed this change, are automatically expanded.
 
-image::images/user-review-ui-change-screen-history.png[width=800, link="images/user-review-ui-change-screen-history.png"]
+image::images/gwt-user-review-ui-change-screen-history.png[width=800, link="images/gwt-user-review-ui-change-screen-history.png"]
 
 [[reply-to-message]]
 It is possible to directly reply to a change message by clicking on the
@@ -683,13 +672,13 @@
 Please note that for a correct rendering it is important to leave a blank
 line between a quoted block and the reply to it.
 
-image::images/user-review-ui-change-screen-reply-to-comment.png[width=800, link="images/user-review-ui-change-screen-reply-to-comment.png"]
+image::images/gwt-user-review-ui-change-screen-reply-to-comment.png[width=800, link="images/gwt-user-review-ui-change-screen-reply-to-comment.png"]
 
 [[inline-comments-in-history]]
 Inline comments are directly displayed in the change history and there
 are links to navigate to the inline comments.
 
-image::images/user-review-ui-change-screen-inline-comments.png[width=800, link="images/user-review-ui-change-screen-inline-comments.png"]
+image::images/gwt-user-review-ui-change-screen-inline-comments.png[width=800, link="images/gwt-user-review-ui-change-screen-inline-comments.png"]
 
 [[expand-all]]
 The `Expand All` button expands all messages; the `Collapse All` button
@@ -706,7 +695,7 @@
 it is 30 seconds. Polling may also be completely disabled by the
 administrator.
 
-image::images/user-review-ui-change-screen-change-update.png[width=800, link="images/user-review-ui-change-screen-change-update.png"]
+image::images/gwt-user-review-ui-change-screen-change-update.png[width=800, link="images/gwt-user-review-ui-change-screen-change-update.png"]
 
 [[plugin-extensions]]
 === Plugin Extensions
@@ -715,7 +704,7 @@
 additional actions to the change info block and display arbitrary UI
 controls below the change info block.
 
-image::images/user-review-ui-change-screen-plugin-extensions.png[width=800, link="images/user-review-ui-change-screen-plugin-extensions.png"]
+image::images/gwt-user-review-ui-change-screen-plugin-extensions.png[width=800, link="images/gwt-user-review-ui-change-screen-plugin-extensions.png"]
 
 [[side-by-side]]
 == Side-by-Side Diff Screen
@@ -726,7 +715,7 @@
 
 This screen allows to review a patch and to comment on it.
 
-image::images/user-review-ui-side-by-side-diff-screen.png[width=800, link="images/user-review-ui-side-by-side-diff-screen.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen.png"]
 
 [[side-by-side-header]]
 In the screen header the project name and the name of the viewed patch
@@ -736,31 +725,15 @@
 the file path are displayed as links to the project and the folder in
 the Git web browser.
 
-image::images/user-review-ui-side-by-side-diff-screen-project-and-file.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-project-and-file.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-project-and-file.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-project-and-file.png"]
 
 [[side-by-side-mark-reviewed]]
-The checkbox in front of the project name and the file name allows the
+The checkbox in front of the file name allows the
 patch to be marked as reviewed. The link:#mark-reviewed[Mark Reviewed]
 diff preference allows to control whether the files should be
 automatically marked as reviewed when they are viewed.
 
-image::images/user-review-ui-side-by-side-diff-screen-reviewed.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-reviewed.png"]
-
-[[scrollbar]]
-The scrollbar shows patch diffs and inline comments as annotations.
-This provides a good overview of the lines in the patch that are
-relevant for reviewing. By clicking on an annotation one can quickly
-navigate to the corresponding line in the patch.
-
-image::images/user-review-ui-side-by-side-diff-screen-scrollbar.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-scrollbar.png"]
-
-[[gaps]]
-A gap between lines in the file content that is caused by aligning the
-left and right side or by displaying inline comments is shown as a
-vertical red bar in the line number column. This prevents a gap from
-being mistaken for blank lines in the file
-
-image::images/user-review-ui-side-by-side-diff-screen-red-bar.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-red-bar.png"]
+image::images/user-review-ui-side-by-side-diff-screen-reviewed.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-reviewed.png"]
 
 [[patch-set-selection]]
 In the header, on each side, the list of patch sets is shown. Clicking
@@ -780,7 +753,7 @@
 version before, may see what has changed since that version by
 comparing the old patch against the current patch.
 
-image::images/user-review-ui-side-by-side-diff-screen-patch-sets.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-patch-sets.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-patch-sets.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-patch-sets.png"]
 
 [[download-file]]
 The download icon next to the patch set list allows to download the
@@ -791,14 +764,14 @@
 If the compared patches are identical, this is highlighted by a red
 `No Differences` label in the screen header.
 
-image::images/user-review-ui-side-by-side-diff-screen-no-differences.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-no-differences.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-no-differences.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-no-differences.png"]
 
 [[side-by-side-rename]]
 If a file was renamed, the old and new file paths are shown in the
 header together with a similarity index that shows how much of the file
 content is unmodified.
 
-image::images/user-review-ui-side-by-side-diff-screen-rename.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-rename.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-rename.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-rename.png"]
 
 [[navigation]]
 For navigating between the patches in a patch set there are navigation
@@ -807,7 +780,7 @@
 the next patch. The arrow up button leads back to the change screen. In
 all cases the selection for the patch set comparison is kept.
 
-image::images/user-review-ui-side-by-side-diff-screen-navigation.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-navigation.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-navigation.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-navigation.png"]
 
 [[inline-comments]]
 === Inline Comments
@@ -833,7 +806,7 @@
 If the diff preference link:#expand-all-comments[Expand All Comments]
 is set to `Expand`, all inline comments will be automatically expanded.
 
-image::images/user-review-ui-side-by-side-diff-screen-inline-comments.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-inline-comments.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-inline-comments.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-inline-comments.png"]
 
 [[comment]]
 In the header of the comment box, the name of the comment author and
@@ -842,7 +815,7 @@
 top left corner. Below the actual comment there are buttons to reply to
 the comment.
 
-image::images/user-review-ui-side-by-side-diff-screen-comment-box.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-comment-box.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-comment-box.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-comment-box.png"]
 
 [[reply-inline-comment]]
 Clicking on the `Reply` button opens an editor to type the reply.
@@ -861,7 +834,7 @@
 
 Clicking on the `Discard` button deletes the inline draft comment.
 
-image::images/user-review-ui-side-by-side-diff-screen-comment-reply.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-comment-reply.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-comment-reply.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-comment-reply.png"]
 
 [[draft-inline-comment]]
 Draft comments are marked by the text "Draft" in the header in the
@@ -870,14 +843,14 @@
 A draft comment can be edited by clicking on the `Edit` button, or
 deleted by clicking on the `Discard` button.
 
-image::images/user-review-ui-side-by-side-diff-screen-comment-edit.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-comment-edit.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-comment-edit.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-comment-edit.png"]
 
 [[done]]
 Clicking on the `Done` button is a quick way to reply with "Done" to a
 comment. This is used to mark a comment as addressed by a follow-up
 patch set.
 
-image::images/user-review-ui-side-by-side-diff-screen-replied-done.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-replied-done.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-replied-done.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-replied-done.png"]
 
 [[add-inline-comment]]
 To add a new inline comment there are several possibilities:
@@ -903,7 +876,7 @@
 ** press 'V' + arrow keys (or 'j', 'k') to select a code block line-wise
 ** type 'bvw' to select a word
 
-image::images/user-review-ui-side-by-side-diff-screen-comment.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-comment.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-comment.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-comment.png"]
 
 For typing the new comment, a new comment box is shown under the code
 that is commented.
@@ -914,57 +887,15 @@
 
 Clicking on the `Discard` button deletes the new comment.
 
-image::images/user-review-ui-side-by-side-diff-screen-commented.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-commented.png"]
+image::images/gwt-user-review-ui-side-by-side-diff-screen-commented.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-commented.png"]
 
 [[file-level-comments]]
 === File Level Comments
 
-Comments that apply to a whole file can be added on file level.
+File level comments are added by clicking the 'File' header at the top
+of the file.
 
-File level comments are added by clicking on the comment icon in the
-header above the file.
-
-image::images/user-review-ui-side-by-side-diff-screen-file-level-comment.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-file-level-comment.png"]
-
-Clicking on the comment icon opens a comment box for typing the file
-level comment.
-
-image::images/user-review-ui-side-by-side-diff-screen-file-level-commented.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-file-level-commented.png"]
-
-[[search]]
-=== Search
-
-For searching within a patch file, a Vim-like search is supported.
-Typing `/` opens the search box. Typing in the search box immediately
-highlights matches in the patch file with a yellow background. Using
-JavaScript regular expressions in the search term is supported. The
-search is case insensitive. After confirming the search by `ENTER` one
-can navigate between the matches by `n` / `N` to go to the next /
-previous match. Skipped lines are automatically expanded if they
-contain a match and one navigates to it.
-
-For additional possibilities to search please check the
-link:http://www.vim.org/docs.php[Vim documentation,role=external,window=_blank]. There are other
-useful ways to search, e.g. while the cursor is on a word, pressing `*`
-or `#` searches for the next or previous occurrence of the word.
-
-Searching by `Ctrl-F` finds matches only in the visible area of the
-screen unless the link:#render[Render] diff preference is set to `Slow`.
-
-image::images/user-review-ui-side-by-side-diff-screen-search.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-search.png"]
-
-[[key-navigation]]
-=== Key Navigation
-
-Vim-like commands can be used to navigate within a patch file:
-
-- `h` / `j` / `k` / `l` moves the cursor left / down / up / right
-- `0` / `$` moves the cursor to the start / end of the line
-- `gg` / `G` moves to cursor to the start / end of the file
-- `Ctrl-D` / `Ctrl-U` scrolls downwards / upwards
-
-Please check the link:http://www.vim.org/docs.php[Vim documentation,role=external,window=_blank]
-for further information.
+image::images/user-review-ui-side-by-side-diff-screen-file-level-comment.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-file-level-comment.png"]
 
 [[diff-preferences]]
 === Diff Preferences
@@ -974,27 +905,10 @@
 preferences. The diff preferences can be accessed by clicking on the
 settings icon in the screen header.
 
-image::images/user-review-ui-side-by-side-diff-screen-preferences.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-preferences.png"]
-
-The diff preferences popup allows to change the diff preferences.
-By clicking on the `Save` button changes to the diff preferences are
-saved permanently. Clicking on the `Apply` button applies the new
-diff preferences to the current screen, but they are discarded when the
-screen is refreshed. The `Save` button is only available if the user is
-signed in.
-
-image::images/user-review-ui-side-by-side-diff-screen-preferences-popup.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-preferences-popup.png"]
+image::images/user-review-ui-side-by-side-diff-screen-preferences.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-preferences.png"]
 
 The following diff preferences can be configured:
 
-- [[theme]]`Theme`:
-+
-Controls the theme that is used to render the file content.
-+
-E.g. users could choose to work with a dark theme.
-+
-image::images/user-review-ui-side-by-side-diff-screen-dark-theme.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-dark-theme.png"]
-
 - [[ignore-whitespace]]`Ignore Whitespace`:
 +
 Controls whether differences in whitespace should be ignored or not.
@@ -1003,11 +917,11 @@
 +
 All differences in whitespace are highlighted.
 +
-** `At Line End`:
+** `Trailing`:
 +
 Whitespace differences at the end of lines are ignored.
 +
-** `Leading, At Line End`:
+** `Leading, Trailing`:
 +
 Whitespace differences at the beginning and end of lines are ignored.
 +
@@ -1021,11 +935,7 @@
 
 - [[columns]]`Columns`:
 +
-Sets the preferred line length. At this position a vertical dashed line
-is displayed so that one can easily detect lines the exceed the
-preferred line length.
-+
-image::images/user-review-ui-side-by-side-diff-screen-column.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-column.png"]
+Sets the preferred line length. At this position, lines are wrapped.
 
 - [[lines-of-context]]`Lines Of Context`:
 +
@@ -1042,134 +952,42 @@
 If many lines are skipped there are additional links to expand the
 context by ten lines before and after the skipped block.
 +
-image::images/user-review-ui-side-by-side-diff-screen-expand-skipped-lines.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-expand-skipped-lines.png"]
-
-- [[intraline-difference]]`Intraline Difference`:
-+
-Controls whether intraline differences should be highlighted.
-+
-image::images/user-review-ui-side-by-side-diff-screen-intraline-difference.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-intraline-difference.png"]
+image::images/user-review-ui-side-by-side-diff-screen-expand-skipped-lines.png[width=800, link="images/gwt-user-review-ui-side-by-side-diff-screen-expand-skipped-lines.png"]
 
 - [[syntax-highlighting]]`Syntax Highlighting`:
 +
 Controls whether syntax highlighting should be enabled.
 +
 The language for the syntax highlighting is automatically detected from
-the file extension. The language can also be set manually by selecting
-it from the `Language` drop-down list.
-+
-image::images/user-review-ui-side-by-side-diff-screen-syntax-coloring.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-syntax-coloring.png"]
+the file extension.
 
-- [[whitespace-errors]]`Whitespace Errors`:
+- [[whitespace-errors]]`Show trailing whitespace`:
 +
-Controls whether whitespace errors are highlighted.
+Controls whether trailing whitespace is highlighted.
 
 - [[show-tabs]]`Show Tabs`:
 +
 Controls whether tabs are highlighted.
 
-- [[line-numbers]]`Line Numbers`:
-+
-Controls whether line numbers are shown.
-
-- [[empty-pane]]`Empty Pane`:
-+
-Controls whether empty panes are shown or not. The Left pane is empty when a
-file was added; the right pane is empty when a file was deleted.
-
-- [[left-side]]`Left Side`:
-+
-Controls whether the left side is shown. This preference is not
-persistent and is ignored by the `Save` button. Every time a
-patch diff is opened, this preference is reset to `Show`.
-
-- [[top-menu]]`Top Menu`:
-+
-Controls whether the top menu is shown.
-
-- [[auto-hide-diff-table-header]]`Auto Hide Diff Table Header`:
-+
-Controls whether the diff table header should be automatically hidden
-when scrolling down more than half of a page.
-
 - [[mark-reviewed]]`Mark Reviewed`:
 +
 Controls whether the files of the patch set should be automatically
 marked as reviewed when they are viewed.
 
-- [[expand-all-comments]]`Expand All Comments`:
-+
-Controls whether all comments should be automatically expanded.
-
-- [[render]]`Render`:
-+
-Controls how patch files that exceed the screen size are rendered.
-+
-If `Fast` is selected file contents which are outside of the visible
-area are not attached to the browser's DOM tree. This makes the
-rendering fast, but searching by `Ctrl+F` only finds content which is
-in the visible area.
-+
-If `Slow` is selected all file contents are attached to the browser's
-DOM tree, which makes the rendering slow for large files. The advantage
-of this setting is that `Ctrl+F` can be used to search in the complete
-file.
-+
-Large files that exceed 4000 lines will not be fully rendered.
-
-- [[line-wrapping]]`Line Wrapping`:
-+
-Controls whether to enable line wrapping or not.
-+
-If `false` is selected then line wrapping is disabled.
-This is the default option.
-+
-If `true` is selected then line wrapping is enabled.
-
 [[keyboard-shortcuts]]
 == Keyboard Shortcuts
 
 Navigation within the review UI can be completely done by keys, and
 most actions can be controlled by keyboard shortcuts. Typing `?` opens
-a popup that shows a list of available keyboard shortcuts:
+a popup that shows a list of available keyboard shortcuts.
 
-- Change Screen
-+
-image::images/user-review-ui-change-screen-keyboard-shortcuts.png[width=800, link="images/user-review-ui-change-screen-keyboard-shortcuts.png"]
 
-- Side-by-Side Diff Screen
-+
-image::images/user-review-ui-side-by-side-diff-screen-keyboard-shortcuts.png[width=800, link="images/user-review-ui-side-by-side-diff-screen-keyboard-shortcuts.png"]
-+
+image::images/user-review-ui-change-screen-keyboard-shortcuts.png[width=800, link="images/gwt-user-review-ui-change-screen-keyboard-shortcuts.png"]
+
+
 In addition, Vim-like commands can be used to link:#key-navigation[
 navigate] and link:#search[search] within a patch file.
 
-[[new-vs-old]]
-== New Review UI vs. Old Review UI
-
-There are some important conceptual differences between the old and
-new review UIs:
-
-- The old change screen directly shows all patch sets of the change.
-  With the new change screen only a single patch set is displayed;
-  users can switch between the patch sets by choosing another patch
-  set from the link:#patch-sets[Patch Sets] drop down panel in the
-  screen header.
-- On the old side-by-side diff screen, new comments are inserted by
-  double-clicking on a line. With the new side-by-side diff screen
-  double-click is used to select a word for commenting on it; there
-  are link:#add-inline-comment[several ways to insert new comments],
-  e.g. by selecting a code block and clicking on the popup comment
-  icon.
-
-[[limitations]]
-Limitations of the new review UI:
-
-- The new side-by-side diff screen cannot render images.
-
-- The new side-by-side diff screen isn't able to highlight line
-  endings.
-
 GERRIT
 ------
 Part of link:index.html[Gerrit Code Review]
diff --git a/Documentation/user-upload.txt b/Documentation/user-upload.txt
index cdaf155..0670968 100644
--- a/Documentation/user-upload.txt
+++ b/Documentation/user-upload.txt
@@ -29,6 +29,13 @@
 * Both, the HTTP and the LDAP passwords (in this order) if `gitBasicAuthPolicy`
   is `HTTP_LDAP`.
 
+When gitBasicAuthPolicy is set to `LDAP` or `HTTP_LDAP` and the user
+is authenticating with the LDAP username/password, the Git client config
+needs to have `http.cookieFile` set to a local file, otherwise every
+single call would trigger a full LDAP authentication and groups resolution
+which could introduce a noticeable latency on the overall execution
+and produce unwanted load to the LDAP server.
+
 When gitBasicAuthPolicy is not `LDAP`, the user's HTTP credentials can
 be regenerated by going to `Settings`, and then accessing the `HTTP
 Password` tab. Revocation can effectively be done by regenerating the
diff --git a/java/com/google/gerrit/httpd/CacheBasedWebSession.java b/java/com/google/gerrit/httpd/CacheBasedWebSession.java
index a3a67e5..7212e3e 100644
--- a/java/com/google/gerrit/httpd/CacheBasedWebSession.java
+++ b/java/com/google/gerrit/httpd/CacheBasedWebSession.java
@@ -76,29 +76,27 @@
     this.identified = identified;
     this.byIdCache = byIdCache;
 
-    if (request.getRequestURI() == null || !GitSmartHttpTools.isGitClient(request)) {
-      String cookie = readCookie(request);
-      if (cookie != null) {
-        authFromCookie(cookie);
-      } else {
-        String token;
-        try {
-          token = ParameterParser.getQueryParams(request).accessToken();
-        } catch (BadRequestException e) {
-          token = null;
-        }
-        if (token != null) {
-          authFromQueryParameter(token);
-        }
+    String cookie = readCookie(request);
+    if (cookie != null) {
+      authFromCookie(cookie);
+    } else if (request.getRequestURI() == null || !GitSmartHttpTools.isGitClient(request)) {
+      String token;
+      try {
+        token = ParameterParser.getQueryParams(request).accessToken();
+      } catch (BadRequestException e) {
+        token = null;
       }
-      if (val != null && !checkAccountStatus(val.getAccountId())) {
-        val = null;
-        okPaths.clear();
+      if (token != null) {
+        authFromQueryParameter(token);
       }
-      if (val != null && val.needsCookieRefresh()) {
-        // Session is more than half old; update cache entry with new expiration date.
-        val = manager.createVal(key, val);
-      }
+    }
+    if (val != null && !checkAccountStatus(val.getAccountId())) {
+      val = null;
+      okPaths.clear();
+    }
+    if (val != null && val.needsCookieRefresh()) {
+      // Session is more than half old; update cache entry with new expiration date.
+      val = manager.createVal(key, val);
     }
   }
 
diff --git a/java/com/google/gerrit/httpd/ProjectBasicAuthFilter.java b/java/com/google/gerrit/httpd/ProjectBasicAuthFilter.java
index ca780d0..7fcd4f8 100644
--- a/java/com/google/gerrit/httpd/ProjectBasicAuthFilter.java
+++ b/java/com/google/gerrit/httpd/ProjectBasicAuthFilter.java
@@ -22,6 +22,7 @@
 import com.google.common.base.Strings;
 import com.google.common.flogger.FluentLogger;
 import com.google.common.io.BaseEncoding;
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.extensions.client.GitBasicAuthPolicy;
 import com.google.gerrit.extensions.registration.DynamicItem;
@@ -144,7 +145,7 @@
     if (gitBasicAuthPolicy == GitBasicAuthPolicy.HTTP
         || gitBasicAuthPolicy == GitBasicAuthPolicy.HTTP_LDAP) {
       if (PasswordVerifier.checkPassword(who.externalIds(), username, password)) {
-        return succeedAuthentication(who);
+        return succeedAuthentication(who, null);
       }
     }
 
@@ -157,11 +158,11 @@
 
     try {
       AuthResult whoAuthResult = accountManager.authenticate(whoAuth);
-      setUserIdentified(whoAuthResult.getAccountId());
+      setUserIdentified(whoAuthResult.getAccountId(), whoAuthResult);
       return true;
     } catch (NoSuchUserException e) {
       if (PasswordVerifier.checkPassword(who.externalIds(), username, password)) {
-        return succeedAuthentication(who);
+        return succeedAuthentication(who, null);
       }
       logger.atWarning().withCause(e).log(authenticationFailedMsg(username, req));
       rsp.sendError(SC_UNAUTHORIZED);
@@ -183,8 +184,8 @@
     }
   }
 
-  private boolean succeedAuthentication(AccountState who) {
-    setUserIdentified(who.account().id());
+  private boolean succeedAuthentication(AccountState who, @Nullable AuthResult whoAuthResult) {
+    setUserIdentified(who.account().id(), whoAuthResult);
     return true;
   }
 
@@ -201,11 +202,15 @@
     return String.format("Authentication from %s failed for %s", req.getRemoteAddr(), username);
   }
 
-  private void setUserIdentified(Account.Id id) {
+  private void setUserIdentified(Account.Id id, @Nullable AuthResult whoAuthResult) {
     WebSession ws = session.get();
     ws.setUserAccountId(id);
     ws.setAccessPathOk(AccessPath.GIT, true);
     ws.setAccessPathOk(AccessPath.REST_API, true);
+
+    if (whoAuthResult != null) {
+      ws.login(whoAuthResult, false);
+    }
   }
 
   private String encoding(HttpServletRequest req) {
diff --git a/java/com/google/gerrit/server/patch/FilePathAdapter.java b/java/com/google/gerrit/server/patch/FilePathAdapter.java
index 7f34cf1..ccd1466 100644
--- a/java/com/google/gerrit/server/patch/FilePathAdapter.java
+++ b/java/com/google/gerrit/server/patch/FilePathAdapter.java
@@ -1,3 +1,17 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package com.google.gerrit.server.patch;
 
 import com.google.gerrit.entities.Patch.ChangeType;
diff --git a/javatests/com/google/gerrit/httpd/BUILD b/javatests/com/google/gerrit/httpd/BUILD
index 75f005e..121cbc4 100644
--- a/javatests/com/google/gerrit/httpd/BUILD
+++ b/javatests/com/google/gerrit/httpd/BUILD
@@ -18,6 +18,7 @@
         "//lib:junit",
         "//lib:servlet-api-without-neverlink",
         "//lib:soy",
+        "//lib/bouncycastle:bcprov",
         "//lib/guice",
         "//lib/guice:guice-servlet",
         "//lib/mockito",
diff --git a/javatests/com/google/gerrit/httpd/ProjectBasicAuthFilterTest.java b/javatests/com/google/gerrit/httpd/ProjectBasicAuthFilterTest.java
index f7792ed..735abbf 100644
--- a/javatests/com/google/gerrit/httpd/ProjectBasicAuthFilterTest.java
+++ b/javatests/com/google/gerrit/httpd/ProjectBasicAuthFilterTest.java
@@ -19,12 +19,15 @@
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.eq;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
+import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.extensions.client.GitBasicAuthPolicy;
 import com.google.gerrit.extensions.registration.DynamicItem;
+import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.account.AccountCache;
 import com.google.gerrit.server.account.AccountException;
 import com.google.gerrit.server.account.AccountManager;
@@ -55,11 +58,17 @@
   private static final String AUTH_USER_B64 =
       B64_ENC.encodeToString(AUTH_USER.getBytes(StandardCharsets.UTF_8));
   private static final String AUTH_PASSWORD = "jd123";
+  private static final String GERRIT_COOKIE_KEY = "GerritAccount";
+  private static final String AUTH_COOKIE_VALUE = "gerritcookie";
+  private static final ExternalId AUTH_USER_PASSWORD_EXTERNAL_ID =
+      ExternalId.createWithPassword(
+          ExternalId.Key.create(ExternalId.SCHEME_USERNAME, AUTH_USER),
+          AUTH_ACCOUNT_ID,
+          null,
+          AUTH_PASSWORD);
 
   @Mock private DynamicItem<WebSession> webSessionItem;
 
-  @Mock private WebSession webSession;
-
   @Mock private AccountCache accountCache;
 
   @Mock private AccountState accountState;
@@ -74,21 +83,57 @@
 
   @Captor private ArgumentCaptor<HttpServletResponse> filterResponseCaptor;
 
+  @Mock private IdentifiedUser.RequestFactory userRequestFactory;
+
+  @Mock private WebSessionManager webSessionManager;
+
+  private WebSession webSession;
   private FakeHttpServletRequest req;
   private HttpServletResponse res;
+  private AuthResult authSuccessful;
 
   @Before
   public void setUp() throws Exception {
-    doReturn(webSession).when(webSessionItem).get();
-    doReturn(Optional.of(accountState)).when(accountCache).getByUsername(AUTH_USER);
-    doReturn(account).when(accountState).account();
-
     req = new FakeHttpServletRequest();
     res = new FakeHttpServletResponse();
+
+    authSuccessful =
+        new AuthResult(AUTH_ACCOUNT_ID, ExternalId.Key.create("username", AUTH_USER), false);
+    doReturn(Optional.of(accountState)).when(accountCache).getByUsername(AUTH_USER);
+    doReturn(Optional.of(accountState)).when(accountCache).get(AUTH_ACCOUNT_ID);
+    doReturn(account).when(accountState).account();
+    doReturn(ImmutableSet.builder().add(AUTH_USER_PASSWORD_EXTERNAL_ID).build())
+        .when(accountState)
+        .externalIds();
+
+    doReturn(new WebSessionManager.Key(AUTH_COOKIE_VALUE)).when(webSessionManager).createKey(any());
+    WebSessionManager.Val webSessionValue =
+        new WebSessionManager.Val(AUTH_ACCOUNT_ID, 0L, false, null, 0L, "", "");
+    doReturn(webSessionValue)
+        .when(webSessionManager)
+        .createVal(any(), any(), eq(false), any(), any(), any());
+  }
+
+  private void initWebSessionWithCookie(String cookie) {
+    req.addHeader("Cookie", cookie);
+    initWebSessionWithoutCookie();
+  }
+
+  private void initWebSessionWithoutCookie() {
+    webSession =
+        new CacheBasedWebSession(
+            req, res, webSessionManager, authConfig, null, userRequestFactory, accountCache) {};
+    doReturn(webSession).when(webSessionItem).get();
+  }
+
+  private void initMockedWebSession() {
+    webSession = mock(WebSession.class);
+    doReturn(webSession).when(webSessionItem).get();
   }
 
   @Test
   public void shouldAllowAnonymousRequest() throws Exception {
+    initMockedWebSession();
     res.setStatus(HttpServletResponse.SC_OK);
 
     ProjectBasicAuthFilter basicAuthFilter =
@@ -102,6 +147,7 @@
 
   @Test
   public void shouldRequestAuthenticationForBasicAuthRequest() throws Exception {
+    initMockedWebSession();
     req.addHeader("Authorization", "Basic " + AUTH_USER_B64);
     res.setStatus(HttpServletResponse.SC_OK);
 
@@ -116,16 +162,11 @@
   }
 
   @Test
-  public void shouldAuthenticateSucessfullyAgainstRealm() throws Exception {
-    req.addHeader(
-        "Authorization",
-        "Basic "
-            + B64_ENC.encodeToString(
-                (AUTH_USER + ":" + AUTH_PASSWORD).getBytes(StandardCharsets.UTF_8)));
+  public void shouldAuthenticateSucessfullyAgainstRealmAndReturnCookie() throws Exception {
+    initWebSessionWithoutCookie();
+    requestBasicAuth(req);
     res.setStatus(HttpServletResponse.SC_OK);
 
-    AuthResult authSuccessful =
-        new AuthResult(AUTH_ACCOUNT_ID, ExternalId.Key.create("username", AUTH_USER), false);
     doReturn(true).when(account).isActive();
     doReturn(authSuccessful).when(accountManager).authenticate(any());
     doReturn(GitBasicAuthPolicy.LDAP).when(authConfig).getGitBasicAuthPolicy();
@@ -139,18 +180,51 @@
 
     verify(chain).doFilter(eq(req), any());
     assertThat(res.getStatus()).isEqualTo(HttpServletResponse.SC_OK);
+    assertThat(res.getHeader("Set-Cookie")).contains(GERRIT_COOKIE_KEY);
+  }
+
+  @Test
+  public void shouldValidateUserPasswordAndNotReturnCookie() throws Exception {
+    initWebSessionWithoutCookie();
+    requestBasicAuth(req);
+    res.setStatus(HttpServletResponse.SC_OK);
+
+    doReturn(true).when(account).isActive();
+    doReturn(GitBasicAuthPolicy.HTTP).when(authConfig).getGitBasicAuthPolicy();
+
+    ProjectBasicAuthFilter basicAuthFilter =
+        new ProjectBasicAuthFilter(webSessionItem, accountCache, accountManager, authConfig);
+
+    basicAuthFilter.doFilter(req, res, chain);
+
+    verify(accountManager, never()).authenticate(any());
+
+    verify(chain).doFilter(eq(req), any());
+    assertThat(res.getStatus()).isEqualTo(HttpServletResponse.SC_OK);
+    assertThat(res.getHeader("Set-Cookie")).isNull();
   }
 
   @Test
   public void shouldNotReauthenticateIfAlreadySignedIn() throws Exception {
-    req.addHeader(
-        "Authorization",
-        "Basic "
-            + B64_ENC.encodeToString(
-                (AUTH_USER + ":" + AUTH_PASSWORD).getBytes(StandardCharsets.UTF_8)));
+    initMockedWebSession();
+    doReturn(true).when(webSession).isSignedIn();
+    requestBasicAuth(req);
     res.setStatus(HttpServletResponse.SC_OK);
 
-    doReturn(true).when(webSession).isSignedIn();
+    ProjectBasicAuthFilter basicAuthFilter =
+        new ProjectBasicAuthFilter(webSessionItem, accountCache, accountManager, authConfig);
+
+    basicAuthFilter.doFilter(req, res, chain);
+
+    verify(accountManager, never()).authenticate(any());
+    verify(chain).doFilter(eq(req), any());
+    assertThat(res.getStatus()).isEqualTo(HttpServletResponse.SC_OK);
+  }
+
+  @Test
+  public void shouldNotReauthenticateIfHasExistingCookie() throws Exception {
+    initWebSessionWithCookie("GerritAccount=" + AUTH_COOKIE_VALUE);
+    res.setStatus(HttpServletResponse.SC_OK);
 
     ProjectBasicAuthFilter basicAuthFilter =
         new ProjectBasicAuthFilter(webSessionItem, accountCache, accountManager, authConfig);
@@ -164,11 +238,8 @@
 
   @Test
   public void shouldFailedAuthenticationAgainstRealm() throws Exception {
-    req.addHeader(
-        "Authorization",
-        "Basic "
-            + B64_ENC.encodeToString(
-                (AUTH_USER + ":" + AUTH_PASSWORD).getBytes(StandardCharsets.UTF_8)));
+    initMockedWebSession();
+    requestBasicAuth(req);
 
     doReturn(true).when(account).isActive();
     doThrow(new AccountException("Authentication error")).when(accountManager).authenticate(any());
@@ -184,4 +255,12 @@
     verify(chain, never()).doFilter(any(), any());
     assertThat(res.getStatus()).isEqualTo(HttpServletResponse.SC_UNAUTHORIZED);
   }
+
+  private void requestBasicAuth(FakeHttpServletRequest fakeReq) {
+    fakeReq.addHeader(
+        "Authorization",
+        "Basic "
+            + B64_ENC.encodeToString(
+                (AUTH_USER + ":" + AUTH_PASSWORD).getBytes(StandardCharsets.UTF_8)));
+  }
 }
diff --git a/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletRequest.java b/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletRequest.java
index a4175e3..2efa94b 100644
--- a/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletRequest.java
+++ b/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletRequest.java
@@ -17,6 +17,7 @@
 import static com.google.common.base.Preconditions.checkArgument;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Objects.requireNonNull;
+import static java.util.stream.Collectors.toList;
 
 import com.google.common.base.Splitter;
 import com.google.common.base.Strings;
@@ -257,7 +258,15 @@
 
   @Override
   public Cookie[] getCookies() {
-    return new Cookie[0];
+    return Splitter.on(";").splitToList(Strings.nullToEmpty(getHeader("Cookie"))).stream()
+        .filter(s -> !s.isEmpty())
+        .map(
+            (String cookieValue) -> {
+              String[] kv = cookieValue.split("=");
+              return new Cookie(kv[0], kv[1]);
+            })
+        .collect(toList())
+        .toArray(new Cookie[0]);
   }
 
   @Override
diff --git a/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletResponse.java b/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletResponse.java
index 9a98ecd..f39b875 100644
--- a/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletResponse.java
+++ b/javatests/com/google/gerrit/util/http/testutil/FakeHttpServletResponse.java
@@ -161,7 +161,7 @@
 
   @Override
   public void addCookie(Cookie cookie) {
-    throw new UnsupportedOperationException();
+    addHeader("Set-Cookie", cookie.getName() + "=" + cookie.getValue());
   }
 
   @Override
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 8c8a886..ed38d6f 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
@@ -153,7 +153,14 @@
     <section
       class$="[[_computeDisplayState(_showAllSections, change, _SECTION.UPDATED)]]"
     >
-      <span class="title">Updated</span>
+      <span class="title">
+        <gr-tooltip-content
+          has-tooltip=""
+          title="Last update of (meta)data for this change."
+        >
+          Updated
+        </gr-tooltip-content>
+      </span>
       <span class="value">
         <gr-date-formatter
           has-tooltip=""
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 874f572..eb943f7 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
@@ -345,7 +345,8 @@
         contextGroups,
         showAbove,
         showBelow,
-        numLines
+        numLines,
+        viewMode
       )
     );
     if (showBelow) {
@@ -364,19 +365,36 @@
     contextGroups: GrDiffGroup[],
     showAbove: boolean,
     showBelow: boolean,
-    numLines: number
+    numLines: number,
+    viewMode: DiffViewMode
   ): HTMLElement {
-    const row = this._createElement('tr', 'contextDivider');
-    if (!(showAbove && showBelow)) {
-      row.classList.add('collapsed');
+    const row = this._createElement('tr', 'dividerRow');
+    if (showAbove && !showBelow) {
+      row.classList.add('showAboveOnly');
+    } else if (!showAbove && showBelow) {
+      row.classList.add('showBelowOnly');
+    } else {
+      // Note that !showAbove && !showBelow also intentionally creates
+      // "showBoth". This means the file is completely collapsed, which is
+      // unusual, but at least happens in one test.
+      row.classList.add('showBoth');
     }
 
-    const element = this._createElement('td', 'dividerCell');
-    row.appendChild(element);
+    row.appendChild(this._createBlameCell(0));
+    if (viewMode === DiffViewMode.SIDE_BY_SIDE) {
+      row.appendChild(this._createElement('td'));
+    }
+
+    const cell = this._createElement('td', 'dividerCell');
+    cell.setAttribute('colspan', '3');
+    row.appendChild(cell);
+    const verticalFlex = this._createElement('div', 'verticalFlex');
+    cell.appendChild(verticalFlex);
+    const horizontalFlex = this._createElement('div', 'horizontalFlex');
+    verticalFlex.appendChild(horizontalFlex);
 
     const showAllContainer = this._createElement('div', 'aboveBelowButtons');
-    element.appendChild(showAllContainer);
-
+    horizontalFlex.appendChild(showAllContainer);
     const showAllButton = this._createContextButton(
       ContextButtonType.ALL,
       section,
@@ -415,7 +433,7 @@
           )
         );
       }
-      element.appendChild(container);
+      horizontalFlex.appendChild(container);
     }
 
     return row;
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 a93d5b5..e254728 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
@@ -318,38 +318,64 @@
       height: calc(var(--line-height-normal) + var(--spacing-s));
     }
 
-    .contextDivider {
-      height: var(--divider-height);
-      /* Create a positioning context. */
-      transform: translateX(0px);
+    .dividerCell {
+      vertical-align: top;
     }
-    .contextDivider.collapsed {
-      /* Hide divider gap, but still show child elements (expansion buttons). */
+    .dividerRow.showBoth .dividerCell {
+      height: var(--divider-height);
+    }
+    .dividerRow.showAboveOnly .dividerCell,
+    .dividerRow.showBelowOnly .dividerCell {
       height: 0;
     }
-    .dividerCell {
-      width: 100%;
-      height: 100%;
+
+    .verticalFlex {
+      display: flex;
+      flex-direction: column;
+      position: relative;
+    }
+    .dividerRow.showBoth .verticalFlex {
+      justify-content: center;
+      margin-top: calc(0px - var(--line-height-normal) - var(--spacing-s));
+      margin-bottom: calc(0px - var(--line-height-normal) - var(--spacing-s));
+      height: calc(
+        2 * var(--line-height-normal) + 2 * var(--spacing-s) +
+          var(--divider-height) - 1px
+      );
+    }
+    .dividerRow.showAboveOnly .verticalFlex {
+      justify-content: flex-end;
+      /* margin-top has to make room for height+1px. */
+      margin-top: calc(-1px - var(--line-height-normal) - var(--spacing-s));
+      height: calc(var(--line-height-normal) + var(--spacing-s));
+    }
+    .dividerRow.showBelowOnly .verticalFlex {
+      justify-content: flex-start;
+      /* This just pushes the container down 1 pixel as to render below the
+         1px border-top of the padding row below. The same could be achieved
+         by position:relative; top:1px.*/
+      margin-top: 1px;
+      margin-bottom: calc(0px - var(--line-height-normal) - var(--spacing-s));
+    }
+
+    .horizontalFlex {
       display: flex;
       justify-content: center;
-      position: absolute;
-      top: 0;
-      left: 0;
+    }
+    .dividerRow.showBoth .horizontalFlex {
+      align-items: center;
+    }
+    .dividerRow.showAboveOnly .horizontalFlex {
+      align-items: end;
+    }
+    .dividerRow.showBelowOnly .horizontalFlex {
+      align-items: start;
     }
     .contextControlButton {
       background-color: var(--default-button-background-color);
       font: var(--context-control-button-font, inherit);
-      /* All position is relative to container, so ignore sibling buttons. */
-      position: absolute;
-    }
-    .contextControlButton:first-child {
-      /* First button needs to claim width to display without text wrapping. */
-      position: relative;
     }
     .centeredButton {
-      /* Center over divider. */
-      top: 50%;
-      transform: translateY(-50%);
       --gr-button: {
         color: var(--diff-context-control-color);
         border-style: solid;
@@ -368,15 +394,17 @@
     .aboveBelowButtons {
       display: flex;
       flex-direction: column;
+      justify-content: center;
       margin-left: var(--spacing-m);
-      position: relative;
     }
     .aboveBelowButtons:first-child {
       margin-left: 0;
     }
+    .dividerRow.showBoth .aboveButton {
+      /* The size of the gap between the above and below button. */
+      margin-bottom: calc(var(--divider-height) + 1px);
+    }
     .aboveButton {
-      /* Display over preceding content / background placeholder. */
-      transform: translateY(-100%);
       --gr-button: {
         color: var(--diff-context-control-color);
         border-style: solid;
@@ -393,8 +421,6 @@
       }
     }
     .belowButton {
-      /* Display over following content / background placeholder. */
-      top: calc(100% + var(--divider-border));
       --gr-button: {
         color: var(--diff-context-control-color);
         border-style: solid;
diff --git a/tools/maven/gerrit-acceptance-framework_pom.xml b/tools/maven/gerrit-acceptance-framework_pom.xml
index 8e47603..00aeb47 100644
--- a/tools/maven/gerrit-acceptance-framework_pom.xml
+++ b/tools/maven/gerrit-acceptance-framework_pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.gerrit</groupId>
   <artifactId>gerrit-acceptance-framework</artifactId>
-  <version>3.4.0-rc4</version>
+  <version>3.4.0-rc5</version>
   <packaging>jar</packaging>
   <name>Gerrit Code Review - Acceptance Test Framework</name>
   <description>Framework for Gerrit's acceptance tests</description>
diff --git a/tools/maven/gerrit-extension-api_pom.xml b/tools/maven/gerrit-extension-api_pom.xml
index 78767dd..2df031a 100644
--- a/tools/maven/gerrit-extension-api_pom.xml
+++ b/tools/maven/gerrit-extension-api_pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.gerrit</groupId>
   <artifactId>gerrit-extension-api</artifactId>
-  <version>3.4.0-rc4</version>
+  <version>3.4.0-rc5</version>
   <packaging>jar</packaging>
   <name>Gerrit Code Review - Extension API</name>
   <description>API for Gerrit Extensions</description>
diff --git a/tools/maven/gerrit-plugin-api_pom.xml b/tools/maven/gerrit-plugin-api_pom.xml
index 3ceda6f..95fc0bf 100644
--- a/tools/maven/gerrit-plugin-api_pom.xml
+++ b/tools/maven/gerrit-plugin-api_pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.gerrit</groupId>
   <artifactId>gerrit-plugin-api</artifactId>
-  <version>3.4.0-rc4</version>
+  <version>3.4.0-rc5</version>
   <packaging>jar</packaging>
   <name>Gerrit Code Review - Plugin API</name>
   <description>API for Gerrit Plugins</description>
diff --git a/tools/maven/gerrit-war_pom.xml b/tools/maven/gerrit-war_pom.xml
index c3a64c8..6ea6cbf 100644
--- a/tools/maven/gerrit-war_pom.xml
+++ b/tools/maven/gerrit-war_pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.gerrit</groupId>
   <artifactId>gerrit-war</artifactId>
-  <version>3.4.0-rc4</version>
+  <version>3.4.0-rc5</version>
   <packaging>war</packaging>
   <name>Gerrit Code Review - WAR</name>
   <description>Gerrit WAR</description>
diff --git a/version.bzl b/version.bzl
index 75804f8..f74b684 100644
--- a/version.bzl
+++ b/version.bzl
@@ -2,4 +2,4 @@
 # Used by :api_install and :api_deploy targets
 # when talking to the destination repository.
 #
-GERRIT_VERSION = "3.4.0-rc4"
+GERRIT_VERSION = "3.4.0-rc5"