GNU bug report logs - #56682
Fix the long lines font locking related slowdowns

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: gerd.moellmann <at> gmail.com, 56682 <at> debbugs.gnu.org, monnier <at> iro.umontreal.ca
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 26 Jul 2022 14:37:26 +0300

> Date: Mon, 25 Jul 2022 21:47:55 +0000
> From: Gregory Heytings <gregory <at> heytings.org>
> cc: Gerd Möllmann <gerd.moellmann <at> gmail.com>, 
>     56682 <at> debbugs.gnu.org, monnier <at> iro.umontreal.ca
> 
> > And I've found a serious sink of CPU cycles under truncate-lines, and 
> > installed a fix on the feature branch.  Gerd, if you have time to 
> > eyeball the fix and comment on it, I'd appreciate.  It's commit 350e97d 
> > on the branch.  (I can post a more detailed explanation of what I did 
> > and why, if that would help, because the code and the functions it calls 
> > are somewhat tricky.)
> 
> Hmmm...  After 350e97d78e, Isearch locks Emacs with toggle-truncate-lines. 
> Recipe:
> 
> C-x C-f long-line.xml
> C-x x t
> C-s </
> 
> You have to kill Emacs, C-g does not work.

I see the same on master, where that change is not yet installed.

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