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

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From: Juri Linkov <juri <at> linkov.net>
To: 56682 <at> debbugs.gnu.org
Cc: eliz <at> gnu.org, gregory <at> heytings.org, monnier <at> iro.umontreal.ca, akrl <at> sdf.org
Subject: bug#56682: feature/improved-locked-narrowing 9dee6df39c: Reworked locked narrowing.
Date: Thu, 09 Feb 2023 19:57:31 +0200

>>> A function/macro to check that could indeed be added, its body would be:
>>> 
>>> (save-restriction (widen) (buffer-narrowed-p))
>>
>> We should add it and document it, but I'm surprised that there's no
>> easier way.  One problem with the above is that it could cause a more
>> thorough redisplay because it fiddles with buffer restrictions.
>
> Seeing how `buffer-narrowed-p` is not used very often, I'm not
> too worried.  Even more so given that the redisplay does try to notice
> when the restriction has been modified temporarily but "reset" to its
> original value since then.

It caused a problem in easy-mmode-define-navigation reported in bug#61215.

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