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 14:59:43 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Probably.  But that doesn't tell what to do with "C-u 0", does it?
> 
> I would want C-u 1 be like M-1 or no prefix arg and C-u 0 produce an
> error because number 0 is invalid.

It is maybe better to ignore an argument of zero, i.e. behave as if
there was no argument.