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

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Message #739 received at 56682 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 56682 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Dmitry Gutov <dgutov <at> yandex.ru>
Subject: Re: bug#56682: Fix the long lines font locking related slowdowns
Date: Tue, 02 Aug 2022 18:26:51 -0400

> You're a mathematician, aren't you?  I'm not speaking of mathematical
> (i.e. absolute) necessity here, but of a practical necessity.

I agree with the practical necessity to narrow.
I strongly disagree with the necessity to make re-widening
technically impossible, I find it fundamentally incompatible with
Emacs's philosophy and can't see any practical justification here.
Just narrow and make sure jit-lock.el and font-lock.el don't
accidentally widen it.  Any other accidental widening should be
considered as a bug anyway (and we could even easily cook up some ad-hoc
advice to try and detect those cases for people like me who lke to run
their Emacs with lots of extra runtime debugging checks).


        Stefan

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