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

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From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: gerd.moellmann <at> gmail.com, 56682 <at> debbugs.gnu.org, larsi <at> gnus.org, monnier <at> iro.umontreal.ca
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Fri, 29 Jul 2022 15:35:23 +0000

>
> And another thing: the condition on it->narrowed_begv being non-zero 
> means that as long as we are close enough to the beginning of a buffer, 
> we don't restrict fontification-functions from going as far as they want 
> into the buffer.
>
> So I think the condition should be the long_line_optimizations_p flag of 
> the buffer, and we should narrow the buffer even when we are at BOB, to 
> prevent fontification-functions from going too far.
>

That's correct, indeed, thanks.  Now fixed on master.

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