bug#45898: 27.1; wedged in redisplay again

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Emacs-hacker2018@jovi.net,  45898@debbugs.gnu.org
> Date: Thu, 09 Jun 2022 12:48:18 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I also think that activating a mode is not TRT in these cases.  I'm
> > trying to think about something better, like mark the offending window
> > as "not for display" or somesuch.
> 
> Yes, that sounds promising.  But it has to be displayed ... a little
> bit, at least.  :-)

Why?