bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Eli Zaretskii]

> Cc: 55863@debbugs.gnu.org, Lars Ingebrigtsen <larsi@gnus.org>
> From: Juri Linkov <juri@linkov.net>
> Date: Thu, 09 Jun 2022 19:58:33 +0300
> 
> > (let ((debug-on-error t))
> >   (error "No chads please."))
> >
> > Then type "q", "C-x C-b", and note the empty lurker *Backtrace*.
> >
> > Apparently I'm the only one irked by this recurring bugaboo.
> 
> A better question is why *Backtrace* is erased?
> Often I accidentally quit the backtrace, then
> try to switch to the *Backtrace* buffer to check
> the backtrace again, but to no avail.

Happened to me as well, indeed.