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

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, dgutov <at> yandex.ru
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Thu, 04 Aug 2022 18:35:36 -0400

>> The wholelines problem did not kick in because of PPS nor `syntax-ppss`
>> but because of font-lock (which then called `syntax-ppss` which then
>> called PPS).
> If it's font-lock that forces syntax-ppss to examine the whole huge
> line, then what is your proposal for avoiding that which doesn't
> involve some more-or-less arbitrary restrictions on the part of the
> buffer that can be examined by syntax-ppss?

The use of `syntax-wholeline-max` in
`font-lock-extend-region-wholelines` supposedly fixed this problem since
it changed `font-lock` so it doesn't ask `syntax-ppss` to compute the
whole line/buffer.


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

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