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bug#56662: 29.0.50; Funny region highlights when highlight-nonselected-w


From: Visuwesh
Subject: bug#56662: 29.0.50; Funny region highlights when highlight-nonselected-windows is t
Date: Thu, 21 Jul 2022 18:02:32 +0530
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

[வியாழன் ஜூலை 21, 2022] Eli Zaretskii wrote:

>> 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?

Ideally, nothing.  Only the active window changes but the region
highlighting before and after should be the same.  Here's another
question: what about delete-selection-mode when the active window is B?
I think there is no satisfactory answer in this area and this bug should
be simply closed (but I'm interested to see an answer though).





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