bug#61667: 29.0.60; Failure to redisplay

[Eli Zaretskii]

> Date: Wed, 22 Feb 2023 18:24:43 +0200
> Cc: 61667@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> > Careful with printfs, since we know this problem goes away when there
> > are too many of them.  Use fputs whenever you can, since fprintf can
> > be much more expensive.
> 
> Indeed, I haven't managed to reproduce the problem even once when the 
> printing patch is applied.
> 
> I've  also tried this one, with the same lack of success:

Maybe instead of printing to stderr, we could display something in the
frame title, which is being updated in this scenario?  AFAIU, the
suggested printfs just show a couple of boolean flags?