bug#56682: Fix the long lines font locking related slowdowns

[Eli Zaretskii]

> Date: Mon, 15 Aug 2022 18:42:08 +0300
> Cc: 56682@debbugs.gnu.org, gregory@heytings.org, monnier@iro.umontreal.ca
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> On 15.08.2022 17:06, Eli Zaretskii wrote:
> >> Date: Sun, 14 Aug 2022 23:46:13 +0300
> >> Cc: 56682@debbugs.gnu.org, gregory@heytings.org, monnier@iro.umontreal.ca
> >> From: Dmitry Gutov <dgutov@yandex.ru>
> >>
> >> I've also run this test on master now, and M-> is not instant there
> >> either.
> > 
> > It's instantaneous here, so I'm not sure why you see something
> > different.
> 
> No idea. Size of file, or even the contents might the reason.
> 
> Here's the profiler output anyway:
> 
>          1067  85% - command-execute
>          1067  85%  - call-interactively
>          1023  82%   - funcall-interactively
>          1012  81%    - end-of-buffer
>          1008  81%     - recenter
>          1008  81%      - jit-lock-function

When did you last resync from Git?  'recenter' got "optimized"
yesterday for buffers with long lines.