VC: New commands for cherry-picking (bug#79408)
* lisp/vc/diff-mode.el (diff-buffer-file-names): New function.
* lisp/vc/log-view.el (vc--pick-or-revert)
(vc--prompt-other-working-tree): Autoload.
(vc-parent-buffer-name, vc-log-short-style)
(vc-print-log-internal): Declare.
(log-view--pick-or-revert): New function.
(log-view-revision-cherry-pick, log-view-revision-revert): New
commands.
(log-view-mode-map, log-view-mode-menu): Bind them.
* lisp/vc/vc-dispatcher.el (vc-start-logentry): If
get-file-buffer returns nil, use the current buffer as the
parent buffer.
* lisp/vc/vc.el (diff-buffer-file-names, diff-reverse-direction):
Declare.
(vc--pick-or-revert): New function.
(vc-revision-cherry-pick, vc-revision-revert): New commands.
* lisp/vc/vc-hooks.el (vc-menu-map): Bind them.
* doc/emacs/maintaining.texi (VC Change Log, VC Undo)
(Copying Between Branches):
* etc/NEWS: Document the new commands.
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