bug#56423: 29.0.50; Hi-lock in dired broken by toggling wdired-mode

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: 56423@debbugs.gnu.org
> Date: Fri, 08 Jul 2022 14:57:34 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > You mean, the display will no longer match the actual situation on
> > disk?  Then I think an unwind-protect or condition-case form that
> > resyncs the display in case of a signal is in order, since preventing
> > the user from aborting in that place would be wrong -- what if the
> > user realizes, too late, that some of the changes mean trouble?
> 
> The question is how to unwind.  I guess the only sensible action would
> be to revert the dired buffer, since we can't revert partial file
> changes, and the situation could look differently in many different
> ways.

Yes, I think reverting is TRT here, since (AFAIU) the display will
then reflect what was actually changed and what wasn't.