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

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From: Eli Zaretskii <eliz <at> gnu.org>
To: gregory <at> heytings.org, gerd.moellmann <at> gmail.com
Cc: 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 16:58:35 +0300

> Cc: gerd.moellmann <at> gmail.com, 56682-done <at> debbugs.gnu.org, larsi <at> gnus.org,
>  monnier <at> iro.umontreal.ca
> Date: Fri, 29 Jul 2022 16:27:50 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> Hmm...  I'm bothered by this code in handle_fontified_prop:
> 
>       if (it->narrowed_begv)
> 	Fnarrow_to_region (make_fixnum (it->narrowed_begv),
> 			   make_fixnum (it->narrowed_zv), Qt);
> 

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.

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