bug#13623: 24.3.50; Redisplay issue with transient-mark-mode

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Dmitry Antipov <dmantipov@yandex.ru>,  wence@gmx.li,  
> 13623@debbugs.gnu.org
> One case where I notice performance sucks is when the minibuffer is in
> use (in my minibuffer-only frame), and I switch to another frame and try
> to work there.

I suggest to create a new bug report with a recipe to reproduce this.