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

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Package: emacs;

Reported by: Gregory Heytings <gregory <at> heytings.org>

Date: Thu, 21 Jul 2022 18:01:01 UTC

Severity: normal

Done: Gregory Heytings <gregory <at> heytings.org>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 56682 <at> debbugs.gnu.org, gregory <at> heytings.org, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 02 Aug 2022 17:46:49 -0400

>> So ideally font-lock is either called with undo-able narrowing, or is 
>> simply passed a range of positions, and shouldn't fontify too far from them.
> Many major-modes do widen the buffer, though.

Actually, IIUC this should be considered a bug (it breaks the use of
that major in mmm-mode and friends).

[ And `grep` suggests that less than half of progmodes/*.el use `widen`.  ]


        Stefan
This bug report was last modified 2 years and 8 days ago.

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