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

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Message #1690 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, Eli Zaretskii <eliz <at> gnu.org>, gregory <at> heytings.org,
 dgutov <at> yandex.ru
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 16 Aug 2022 09:26:15 -0400

> Also, regarding most of the lines being invisible. Unless I miss
> something, jit-lock actually tries to trigger fontification in the
> invisible lines when we have something like:
> -- <window top>
> * headline
> <Mbs of invisible text hidden using 'invisible text property>
> * another headline
> -- <window bottom>

Normally, jit-lock does not fontify invisible text except as a side
effect of fontifying visible text (because the fontification is made in
chunks of about 1kB, plus rounding up to wholelines and such).

So it's normal that it fontifies a couple kB of that MB of invisible
text, but if it fontifies all those MBs I'd consider it as a bug.


        Stefan

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