GNU bug report logs - #41441
26.3; mhtml misbehaving font-lock extend region can cause Emacs to hang

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Message #23 received at 41441 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Tom Tromey <tom <at> tromey.com>, Anders Lindgren <andlind <at> gmail.com>
Cc: 41441 <at> debbugs.gnu.org
Subject: Re: bug#41441: 26.3; mhtml misbehaving font-lock extend region can
 cause Emacs to hang
Date: Thu, 28 May 2020 21:40:03 +0300

On 28.05.2020 19:13, Tom Tromey wrote:
> You can enlarge (or even reduce) the region to refontify by setting
> the following variable:

This is about font-lock-extend-after-change-region-function, though, 
isn't it?

And since that variable is not a hook (or a list), it wouldn't be 
subject to inflooping problems. Though I wouldn't like this semantics 
for it either, given the name.

> I don't remember the test case.  Not sure if the self-tests cover this;
> maybe it's archived in a bug somewhere though.

Someone should take a look.

If we don't find good examples, though, and if we agree that the design 
seems sound, we can turn it off on master and see if anyone complains.

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