GNU bug report logs - #57804
An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Paul Pogonyshev <pogonyshev <at> gmail.com>
Cc: 57804 <at> debbugs.gnu.org
Subject: bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely
Date: Wed, 14 Sep 2022 19:25:49 +0200

Paul Pogonyshev <pogonyshev <at> gmail.com> writes:

>> For instance, if the user hits `C-g' three times (and Emacs doesn't idle
>> in between), then we disable font-lock in that buffer.
>
> That sounds much better. I know that `C-g' is what to press when Emacs
> is stuck.

A single `C-g' wouldn't be quite the right thing, because the user may
hit `C-g' by accident while font-lock happens to run (and it's not
hanging), which is why I though a special key sequence like `C-g C-g
C-g' might make sense.

>> There's also `max-redisplay-ticks' -- but I'm not sure that would have
>> helped here?
>
> If I add `(setf max-redisplay-ticks 100)' right after entering
> `buggy-mode', it seems to have some effect, but not exactly what I'd
> hope on. I suggest you try and see for yourself, hard to describe
> them.

Doesn't seem to have any effect here...

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