bug#58175: 29.0.50; M-x window-swap-states during an active mark leaves behind a region overlay

[Eli Zaretskii]

> Date: Tue, 4 Oct 2022 10:23:49 +0200
> Cc: 58175@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
> From: martin rudalics <rudalics@gmx.at>
> 
>  > Looks like the internal-region-overlay window parameter, which is
>  > important for correct workings of region-highlight, isn't copied
>  > correctly to the other window as part of swapping state, because its
>  > value ends up as "overlay N in no buffer", i.e. the overlay's buffer
>  > is lost in transition.
> 
> If you want a window parameter to get copied when swapping window states,
> you have to explicitly mark it as "persistent".  For example with:
> 
> (push '(internal-region-overlay . t) window-persistent-parameters)

Thanks.  Does this affect only window-swap-states, or does this affect
anything else?  If the former, I guess the above should be done
globally when Emacs is dumped?