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Re: How the long-lines "optimisation" breaks font locking.

From: Dmitry Gutov
Subject: Re: How the long-lines "optimisation" breaks font locking.
Date: Sat, 6 Aug 2022 13:54:05 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1

On 06.08.2022 08:36, Eli Zaretskii wrote:
Date: Fri, 5 Aug 2022 22:50:07 +0300
Cc: acm@muc.de, larsi@gnus.org, emacs-devel@gnu.org, gregory@heytings.org
From: Dmitry Gutov <dgutov@yandex.ru>

On 05.08.2022 18:30, Eli Zaretskii wrote:
The slow part I'm referring to is not in font-lock's code, nor in CC
Mode's font-lock rules. So it can be "fixed" independently.
Then where is it?

Probably somewhere in the recent xdisp.c changes.

Very unlikely.  The recent changes in xdisp.c could not have possibly
slowed down the code there.

No, no. They fixed it.

That's why the advice to set long-line-threshold to nil (if one wants correct fontification) is not so great: it brings those issues back.

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