bug#57325: 27.1; functions in ff-other-file-alist

[Eli Zaretskii <eliz@gnu.org>]

> From: Felician Nemeth <felician.nemeth@gmail.com>
> Cc: 57325@debbugs.gnu.org
> Date: Sun, 21 Aug 2022 21:37:31 +0200
> 
> I got confused because if I remove the
> (setq uniquify-buffer-name-style nil) line from bug.el, then
> ff-find-related-file will open the parent directory of xref.el, which
> feels correct.  However, with that line setting
> uniquify-buffer-name-style, ff-find-related-file selects /tmp/dir/1234,
> which feels wrong because that buffer has nothing to do with xref.el.
> 
> In my case, a file can contain a link to another file (a .toml file to a
> schema file).  I wasn't sure what to do when the original file did not
> contain a link.  Maybe my-find-related-file should ask the user what to
> do in this case, or just do a (user-error "There's no related file.").

OK, I will look closer at this specific use case and see whether
there's some problem in find-file.el in that case.