* lisp/vc/vc-hooks.el (vc-use-short-revision): New variable.
(vc-short-revision): New function.
* lisp/vc/vc-annotate.el (vc-annotate-use-short-revision): New
option...
(vc-annotate): ... use it.
* lisp/vc/vc-git.el (vc-git--rev-parse): Consult
'vc-use-short-revision'.
* etc/NEWS: Announce this change (bug#67062).