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bug#57150: 29.0.50; [PATCH] Add test coverage for overlay modification h
From: |
Eli Zaretskii |
Subject: |
bug#57150: 29.0.50; [PATCH] Add test coverage for overlay modification hooks |
Date: |
Wed, 17 Aug 2022 14:51:26 +0300 |
> From: Richard Stallman <rms@gnu.org>
> Cc: yantar92@gmail.com, matt@rfc20.org, 57150@debbugs.gnu.org
> Date: Tue, 16 Aug 2022 22:50:38 -0400
>
> > The problems with overlays in Emacs are much wider than just Org. Our
> > performance sucks in many cases because of that. Just two examples
> > that were mentioned lately in the "long-line optimizations"
> > discussion: show-paren-mode and isearch-lazy-highlight -- each one of
> > these two is capable of literally bringing Emacs to its knees,
> > response-time wise.
>
> The first question is, should these use text properties instead of
> overlays?
Text properties are less convenient when used for ephemeral
highlighting.
> Are they using many overlays to highlight many potential matches in a
> long buffer?
isearch-lazy-highlight does.
> If so, would it make sense to show, at any time, only those
> that are near point? When you move to a far-away part of the buffer,
> it could add highlighting to the matches near there. But maybe it
> can avoid ever trying to highlight more than a few parts of the buffer.
isearch.el already attempts to do that, but its method of detecting
what's out of the window doesn't work under truncate-lines.
bug#57150: 29.0.50; [PATCH] Add test coverage for overlay modification hooks, Ihor Radchenko, 2022/08/13