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

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Message #1453 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Ihor Radchenko <yantar92 <at> gmail.com>
Cc: 56682 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>,
 Eli Zaretskii <eliz <at> gnu.org>, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Sun, 14 Aug 2022 21:52:27 -0400

Ihor Radchenko [2022-08-15 09:23:21] wrote:
> Dmitry Gutov <dgutov <at> yandex.ru> writes:
>> Do you have examples of such modes?
>> Calling 'widen' inside font-lock-keywords is a bug, and the bugs should 
>> be fixed at the source.
> widen inside save-restriction is likely used by Org mode (or will be).

Why?

> This is needed by Org parser to determine the syntax element at point.

But font-lock widens before using Org-mode's `font-lock-keywords`, so
there should be no need for Org-mode to widen in that case.


        Stefan


PS: Not sure if Org-mode qualifies as a mode that is likely to suffer
from the kinds of long-lines or large-file problems that Gregory has
tried to tackle, tho.  I've never seen an Org file with lines >10kB nor
an Org file larger than 10MB.

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