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bug#56682: Fix the long lines font locking related slowdowns


From: Dmitry Gutov
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 16 Aug 2022 17:39:15 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1

On 16.08.2022 17:10, Eli Zaretskii wrote:
Date: Tue, 16 Aug 2022 17:00:18 +0300
Cc: 56682@debbugs.gnu.org, gregory@heytings.org, monnier@iro.umontreal.ca
From: Dmitry Gutov <dgutov@yandex.ru>

It's a buffer without long lines. Simply a large file.

??? Are we talking about long-line.xml, or are we talking about
some other file?  We did nothing to change the behavior in large files
without long lines.

I'm talking about a 20 MB file I created manually with some simple
contents. Just no long lines.

That's a different problem, one we didn't try to fix yet.

If you are saying that 'recenter' takes too long in some file, and
therefore delays M-> for too long, it is probably a separate issue, so
please report that as a separate bug, preferably with the file that
causes it.

It seems pertinent to me since ultimately the decision to narrow in
handle_fontified_prop is driven by the idea that font-lock in large
files ends up being a problem anyway. And here we have a large file
where this doesn't help.

Because it's a different problem, with likely a different solution.

But I can file it separately, of course.

Yes, please.

Bug#57245. Thanks.





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