GNU bug report logs - #30088
Rendering glitch with double buffering enabled

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From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 30088 <at> debbugs.gnu.org, npostavs <at> users.sourceforge.net, damien <at> cassou.me, dgutov <at> yandex.ru, charles <at> aurox.ch, Lars Ingebrigtsen <larsi <at> gnus.org>
Subject: bug#30088: Rendering glitch with double buffering enabled
Date: Tue, 22 Feb 2022 09:05:35 +0800

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

> I reverted that commit.
>
> PROBLEMS is special in that it describes issues with software other
> than Emacs.  Since we cannot control that external software, we
> usually cannot know whether and when those issues are resolved, nor
> whether old versions of that software are still being used by someone
> who happens to run a newer Emacs.  So the fact that Damien no longer
> sees the problem doesn't mean it cannot happen to someone else,
> because what fixed that for Damien could be upgrade of some software
> (other than Emacs) which other Emacs users don't necessarily share.
>
> For this reason, we almost never can positively know that a PROBLEMS
> entry is no longer relevant, and that is why we have there very old
> entries.  (It's possible that some of them can be removed, but the
> rationale should be that we can establish positively that the software
> causing problems is known to not be relevant anymore.)

Yes.  This particular bug also depends on the video driver and X server
to a larger degree than normal.  Damien could have upgraded his X
server, but other people might be running different versions (or
entirely different servers altogether.)

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