bug#54636: dired fails to update subdirs when files are created/deleted/renamed

[Eli Zaretskii]

> From: Tassilo Horn <tsdh@gnu.org>
> Cc: 54636@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> Date: Wed, 30 Mar 2022 14:43:22 +0200
> 
> Andreas Schwab <schwab@linux-m68k.org> writes:
> 
> > Broken by 7b50ed553f Ask if dir and subdir dired buffers be killed
> > when deleting dir.

Thanks for the bisection, Andreas, it made finding the culprit very
easy.

> Oh, sorry, I'll look into it ASAP.  I guess this is to be corrected in
> emacs-28?

Yes.

I think I just fixed it there, please take a look.