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

[Eli Zaretskii]

> Date: Thu, 04 Aug 2022 12:05:14 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Dmitry Gutov <dgutov@yandex.ru>, gerd.moellmann@gmail.com, 
>     56682@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>, 
>     monnier@iro.umontreal.ca
> 
> >> Feel free to enlarge long-line-threshold in your init file.
> >
> > Just a curious question: How did we arrive at the current value of 
> > `long-line-threshold'?
> >
> 
> I took the same value that Stefan had chosen for syntax-wholeline-max.

And it isn't sacred in any way.  If we decide a different value
strikes a better balance, we will change it.