GNU bug report logs - #57150
29.0.50; [PATCH] Add test coverage for overlay modification hooks

Previous Next

Full log

Message #38 received at 57150 <at> debbugs.gnu.org (full text, mbox):

From: Richard Stallman <rms <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: matt <at> rfc20.org, yantar92 <at> gmail.com, 57150 <at> debbugs.gnu.org
Subject: Re: bug#57150: 29.0.50;
 [PATCH] Add test coverage for overlay modification hooks
Date: Tue, 16 Aug 2022 22:50:38 -0400

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > 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?

Are they using many overlays to highlight many potential matches in a
long buffer?  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.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.