GNU bug report logs - #22466
25.0.50; disable-theme apparently forces a redisplay and causes a screen flash

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From: Mauro Aranda <maurooaranda <at> gmail.com>
To: 22466 <at> debbugs.gnu.org
Cc: Eli Zaretskii <eliz <at> gnu.org>, Artur Malabarba <bruce.connor.am <at> gmail.com>
Subject: bug#22466: 25.0.50; disable-theme apparently forces a redisplay and causes a screen flash
Date: Fri, 7 Mar 2025 08:53:25 -0300

[Message part 1 (text/plain, inline)]

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Artur Malabarba <bruce.connor.am <at> gmail.com>
>> Cc: 22466 <at> debbugs.gnu.org
>> Date: Wed, 27 Jan 2016 20:20:43 +0000
>>
>> > Then it would make sense to find a way of switching a theme without
>> > changing the frame's background color, if that's possible (i.e. if the
>> > new theme keeps the same background color).  If there's a function
>> > missing for that, I'd suggest to add one.
>>
>> How about just running that form only when necessary (i.e., only if the
>> disabled theme actually sets the frame `background-color')?
>
> Yes, something like that.  Or maybe add a new switch-theme API that
> receives both the old and a new theme, and changes the background
> color only if the new theme sets a different one.

With the provided recipe, I only see a flash at the scroll-bar
position, unlike in older versions.

I'll be testing the attached patch for a while, which introduces a
new switch-theme command.

[0001-New-command-switch-theme.patch (text/x-patch, attachment)]

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