bug#56662: 29.0.50; Funny region highlights when highlight-nonselected-windows is t

[Eli Zaretskii <eliz@gnu.org>]

> From: Visuwesh <visuweshm@gmail.com>
> Cc: Kévin Le Gouguec <kevin.legouguec@gmail.com>,
>   56662@debbugs.gnu.org
> Date: Thu, 21 Jul 2022 16:52:06 +0530
> 
> [வியாழன் ஜூலை 21, 2022] Eli Zaretskii wrote:
> 
> >>     I kind of wish there was a third value for this user option;
> >>     e.g. (setq highlight-nonselected-windows 'lazy) to signify "keep
> >>     highlighting as-is when leaving the window, and never update it
> >>     until the window becomes current again"? 🤷
> >
> > How would that work, if you take into consideration that the region is
> > between the mark and point?
> 
> I can think of one way this could potentially work is by checking if the
> mark was made when window was active so making the mark "window-aware"?
> I.e., if two windows A and B show the same buffer and the user typed
> C-SPC when in window A, then the region would not show up in window B.
> Does this make sense?

So what happens if the user then types "C-x o" to switch to B?