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

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 56682 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>, gregory <at> heytings.org
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 2 Aug 2022 17:08:01 +0300

On 02.08.2022 10:55, Stefan Monnier wrote:
>> only top and bottom of the buffer are fontified), with the caveat that
>> font-lock always tries to backtrack to BOL when fontifying the current
>> hunk. Which makes sense, of course, but could be tweaked for long lines to
>> avoid re-fontifying the whole buffer again and again.
> It has already been (recently) tweaked for this on `master`.

Sorry I missed that. Commit 15b2138719b34083967001c3903e7560d5e0947c, right?

Then, as long as redisplay avoids narrowing when running 
fontification-functions, everything should work well.

Or at least much better than before.

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