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

[Lars Ingebrigtsen]

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.)