bug#51883: 29.0.50; Command to get accidentally deleted frames back

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: gregory@heytings.org,  51883@debbugs.gnu.org,  juri@linkov.net
> Date: Sat, 27 Nov 2021 14:22:11 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > You want to make "C-x 5 u" and "C-u 1 C-x 5 u" mean the same?
> 
> Yes, I think that would be the simplest solution.
> 
> >  It's possible, but we also have commands/functions that work like
> > above, no?
> 
> I'm not sure.  I didn't find one quickly.
> 
> In my opinion in this case it would not make much sense conceptionally,
> numbering the last killed frames starting with 1 is more natural than
> counting zero based.  Making it zero based would be an annoying detail
> one has to remember without much gain.  Just my personal opinion without
> having meditated long over the matter, of course.

Fine with me.

Gregory, please do it this way, to avoid future rework due to my own
idiosyncrasies.