It doesn't flicker... but it doesn't seem to change the locale either... 
I tried

(message                                                                     
 (with-locale-environment "es_ES.utf8"                                                
   (format-time-string ";; %a, %d %b %Y %H:%m:%S %z"))) 

and

(message                                                                     
 (with-locale-environment "C"                                                
   (format-time-string ";; %a, %d %b %Y %H:%m:%S %z"))) 

And in both cases I get the "C" locale :(
Before the strings were correctly generated

Thanks for the patience, /PA

On Fri, 30 Sept 2022 at 16:14, Lars Ingebrigtsen <larsi@gnus.org> wrote:
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.)


--
Fragen sind nicht da um beantwortet zu werden,
Fragen sind da um gestellt zu werden
Georg Kreisler

Headaches with a Juju log:
unit-basic-16: 09:17:36 WARNING juju.worker.uniter.operation we should run a leader-deposed hook here, but we can't yet