bug#55039: [PATCH] Use VC-relative file names in ChangeLog entries

[Eli Zaretskii <eliz@gnu.org>]

> From: Philip Kaludercic <philipk@posteo.net>
> Cc: larsi@gnus.org,  55039@debbugs.gnu.org
> Date: Tue, 06 Sep 2022 20:11:57 +0000
> 
> >> Also, as the entire point of
> >> the patch was that emacs.git is using relative path names, should a
> >> .dir-locals.el variable be set to ensure this is done?
> >
> > I guess so, yes.  But what would happen to people who use Emacs
> > versions before 29?
> 
> It should have no effect.

Unfortunately, this is not true, at least not the way this was
implemented in our .dir-locals.el.  Now, whenever I visit _any_ file
in the repository, I get this warning pop up:

  The local variables list in d:/gnu/git/emacs/trunk/
  contains values that may not be safe (*).

  Do you want to apply it?  You can type
  y  -- to apply the local variables list.
  n  -- to ignore the local variables list.
  !  -- to apply the local variables list, and permanently mark these
	values (*) as safe (in the future, they will be set automatically.)
  i  -- to ignore the local variables list, and permanently mark these
	values (*) as ignored

      tab-width : 8
      sentence-end-double-space : t
      fill-column : 70
      emacs-lisp-docstring-fill-column : 65
      bug-reference-url-format : "https://debbugs.gnu.org/%s"
    * diff-add-log-use-relative-names : t
      indent-tabs-mode : nil
      electric-quote-comment : nil
      electric-quote-string : nil
      mode : bug-reference-prog

and I _must_ type a response.  If I answer !, Emacs will write to my
init file, which I'm not sure I like; if I type y, I will have to do
that for every file I visit.

This is the nuisance caused by immediately adding newly introduced
variables into file-local or directory-local settings to our
repository.  We should keep this in mind when introducing such stuff.