GNU bug report logs - #56393
Actually fix the long lines display bug

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Ihor Radchenko <yantar92 <at> gmail.com>
Cc: gerd.moellmann <at> gmail.com, gregory <at> heytings.org, larsi <at> gnus.org, 56393 <at> debbugs.gnu.org
Subject: bug#56393: Actually fix the long lines display bug
Date: Sat, 09 Jul 2022 15:37:22 +0300

> From: Ihor Radchenko <yantar92 <at> gmail.com>
> Cc: Gregory Heytings <gregory <at> heytings.org>,  gerd.moellmann <at> gmail.com,
>   larsi <at> gnus.org,  56393 <at> debbugs.gnu.org
> Date: Sat, 09 Jul 2022 20:09:42 +0800
> 
> I am not sure if it is related, but I do observe a slowdown when moving
> across fontified buffer. This happens in really large buffers when
> moving across invisible text. AFAIU, line-move-1 uses
> next-single-property-change loop, which could be costly when the region
> has a large number of discontinuous text properties.

Invisible text is a different matter altogether.  The problem there is
that the amount of text on the screen is very different from what's
actually in the buffer, and moving through such a buffer needs to skip
the invisible text, which isn't free.

Face properties don't have such an effect.

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