bug#55687: 29.0.50; make-frame chid frame crash/regression from dfa3e6f424

[Eli Zaretskii]

merge 55687 55684
thanks

> Cc: acm@muc.de
> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Fri, 27 May 2022 23:40:13 -0400
> 
> After dfa3e6f424, the following crashes/hangs Emacs (on my machine it
> actually causes a debug window to pop up, Emacs to become unresponsive,
> and a sound to play continually)
> 
> (make-frame `((minibuffer . only) (parent-frame . ,(selected-frame))))

Looks like Emacs tries to enter the Lisp debugger, and gets stuck in
some loop.

Alan, this also affects the release branch, so please fix it there
first.

The patch Stefan posted earlier in bug#55684 fixes this problem as
well, AFAICT.

Thanks.