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: Mon, 01 Aug 2022 13:30:44 +0000

>>> Which means, for example, that tests like this:
>>>
>>>  if (current_buffer->long_line_optimizations_p)
>>>    {
>>>      if (!it->narrowed_begv  <<<<<<<<<<<<<<<<<<<<<<<<<<
>>>         || ((pos.charpos < it->narrowed_begv || pos.charpos > it->narrowed_zv)
>>>             && (!redisplaying_p || it->line_wrap == TRUNCATE)))
>>>
>>> are not necessarily reliable, because we never initialize 
>>> narrowed_begv to zero, AFAICT.  Right?
>>
>> Indeed.  That wasn't a problem with the previous code in which 
>> narrowed_begv was unconditionally assigned.  Now it is.  I think the 
>> following change should be enough to fix this.  Agreed?
>
> Yes, of course.
>

Thanks; now pushed.

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