merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

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+git-gui(1)
+==========
+
+NAME
+----
+git-gui - A portable graphical interface to Git
+
+SYNOPSIS
+--------
+[verse]
+'git gui' [<command>] [arguments]
+
+DESCRIPTION
+-----------
+A Tcl/Tk based graphical user interface to Git.  'git gui' focuses
+on allowing users to make changes to their repository by making
+new commits, amending existing ones, creating branches, performing
+local merges, and fetching/pushing to remote repositories.
+
+Unlike 'gitk', 'git gui' focuses on commit generation
+and single file annotation and does not show project history.
+It does however supply menu actions to start a 'gitk' session from
+within 'git gui'.
+
+'git gui' is known to work on all popular UNIX systems, Mac OS X,
+and Windows (under both Cygwin and MSYS).  To the extent possible
+OS specific user interface guidelines are followed, making 'git gui'
+a fairly native interface for users.
+
+COMMANDS
+--------
+blame::
+	Start a blame viewer on the specified file on the given
+	version (or working directory if not specified).
+
+browser::
+	Start a tree browser showing all files in the specified
+	commit.  Files selected through the
+	browser are opened in the blame viewer.
+
+citool::
+	Start 'git gui' and arrange to make exactly one commit before
+	exiting and returning to the shell.  The interface is limited
+	to only commit actions, slightly reducing the application's
+	startup time and simplifying the menubar.
+
+version::
+	Display the currently running version of 'git gui'.
+
+
+Examples
+--------
+`git gui blame Makefile`::
+
+	Show the contents of the file 'Makefile' in the current
+	working directory, and provide annotations for both the
+	original author of each line, and who moved the line to its
+	current location.  The uncommitted file is annotated, and
+	uncommitted changes (if any) are explicitly attributed to
+	'Not Yet Committed'.
+
+`git gui blame v0.99.8 Makefile`::
+
+	Show the contents of 'Makefile' in revision 'v0.99.8'
+	and provide annotations for each line.  Unlike the above
+	example the file is read from the object database and not
+	the working directory.
+
+`git gui blame --line=100 Makefile`::
+
+	Loads annotations as described above and automatically
+	scrolls the view to center on line '100'.
+
+`git gui citool`::
+
+	Make one commit and return to the shell when it is complete.
+	This command returns a non-zero exit code if the window was
+	closed in any way other than by making a commit.
+
+`git gui citool --amend`::
+
+	Automatically enter the 'Amend Last Commit' mode of
+	the interface.
+
+`git gui citool --nocommit`::
+
+	Behave as normal citool, but instead of making a commit
+	simply terminate with a zero exit code. It still checks
+	that the index does not contain any unmerged entries, so
+	you can use it as a GUI version of linkgit:git-mergetool[1]
+
+`git citool`::
+
+	Same as `git gui citool` (above).
+
+`git gui browser maint`::
+
+	Show a browser for the tree of the 'maint' branch.  Files
+	selected in the browser can be viewed with the internal
+	blame viewer.
+
+SEE ALSO
+--------
+linkgit:gitk[1]::
+	The Git repository browser.  Shows branches, commit history
+	and file differences.  gitk is the utility started by
+	'git gui''s Repository Visualize actions.
+
+Other
+-----
+'git gui' is actually maintained as an independent project, but stable
+versions are distributed as part of the Git suite for the convenience
+of end users.
+
+A 'git gui' development repository can be obtained from:
+
+  git clone git://repo.or.cz/git-gui.git
+
+or
+
+  git clone http://repo.or.cz/r/git-gui.git
+
+or browsed online at http://repo.or.cz/w/git-gui.git/[].
+
+GIT
+---
+Part of the linkgit:git[1] suite