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

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Message #727 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 56682 <at> debbugs.gnu.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: Tue, 02 Aug 2022 17:51:41 -0400

> And even if one sets font-lock-dont-widen to nil, mode authors are
> completely free to ignore that setting (assuming they're aware it exists).

Hmm... `font-lock-dont-widen` is not about telling the major modes's
font-lock code to refrain from narrowing.  It's there so a major mode
(like mmm-mode) can tell font-lock.el to refrain from widening.

The major-mode's own font-lock rules should never need to widen
(because font-lock itself does it, normally).  If they do, it's a bug.


        Stefan

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