bug#19045: 25.0.50; [PATCH] vc-git-print-log use --follow

[Eli Zaretskii <eliz@gnu.org>]

> From: Juri Linkov <juri@linkov.net>
> Date: Sun, 04 Feb 2018 23:58:53 +0200
> 
> > Too bad that a new useful customizable variable
> > vc-git-print-log-follow is not mentioned in NEWS.26.
> >
> > It works quite well, but only with the following fix
> > that puts more restrictions - it checks not only
> > for a directory, but also if it is a single file.
> >
> > The whole patch is intended for the emacs-26 branch:
> 
> Pushed to the emacs-26 branch.

Please don't push anything to the release branch without John's or
mine explicit approval.  As things are, I'm very busy these days, and
didn't yet have time to review the patch thoroughly, so I'm not sure
I'm happy with its being pushed.

> diff --git a/lisp/vc/vc-dispatcher.el b/lisp/vc/vc-dispatcher.el
> index b0d2221..efdd29e 100644
> --- a/lisp/vc/vc-dispatcher.el
> +++ b/lisp/vc/vc-dispatcher.el
> @@ -313,6 +313,8 @@ vc-do-command
>  	    (status 0))
>  	(when files
>  	  (setq squeezed (nconc squeezed files)))
> +        (let ((inhibit-message t))
> +          (message "Running %s %s" command (vc-delistify squeezed)))
>  	(let (;; Since some functions need to parse the output
>  	      ;; from external commands, set LC_MESSAGES to C.
>  	      (process-environment (cons "LC_MESSAGES=C" process-environment))

I don't understand why would we want to hard-code the fact that these
commands are not shown in the echo area.