bug#61667: 29.0.60; Failure to redisplay

[Eli Zaretskii]

> Date: Tue, 21 Feb 2023 17:43:46 +0200
> Cc: 61667@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> > Does it help to disable double buffering?
> 
> Looks like it does:
> 
>    emacs --eval "(modify-frame-parameters nil 
> '((inhibit-double-buffering . t)))"
> 
> That "fixes" the scenario. :-(

Po Lu, can you look into this, assuming double-buffering indeed has
something to do with this?  Some recent changes in this area in the
last month or so, perhaps?