bug#58193: 29.0.50; Screen flickers on with-locale-environment

[Eli Zaretskii]

> Cc: 58193@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Fri, 30 Sep 2022 16:14:49 +0200
> 
> Pedro Andres Aranda Gutierrez <paaguti@gmail.com> writes:
> 
> > Include the following code in *scratch*
> >
> > (with-locale-environment "C"
> >   (insert (format-time-string ";; %a, %d %b %Y %H:%m:%S %z")))
> >
> > Evaluate with C-c C-e and experience a screen flicker
> 
> I think I've now fixed this -- can you test?  (I don't see the flicker
> myself.)

I'd rather leave the decision whether to redraw or not to the caller.
I don't see how we can safely assume that the caller never wants to
actually use the locale's settings for something display-oriented.