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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Message #2172 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 56682 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>,
 Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#56682: feature/improved-locked-narrowing 9dee6df39c:
 Reworked locked narrowing.
Date: Tue, 31 Jan 2023 16:46:11 -0500

> Speaking of additional slowdowns, though, at least in theory -- both
> syntax-ppss and tree-sitter drop their current parse result when point-min
> changes.

FWIW, `syntax-ppss` keeps 2 caches: one for point-min=1 and one for the
other cases.  So narrowing doesn't quite "drop the current parse", it
just temporarily ignores it, but recovers it when we exit the narrowing.


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

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