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

[Eli Zaretskii]

> Date: Thu, 04 Aug 2022 09:24:00 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: dgutov@yandex.ru, gerd.moellmann@gmail.com, 56682@debbugs.gnu.org, 
>     monnier@iro.umontreal.ca
> 
> I just pushed an improvement for Bidi.  I did not do so earlier because I 
> was trying to improve it further, but somehow I'm hitting a brick wall 
> here.  Could you please check, and tell me if what I already did is okay?

Will do, thanks.

> > If you for some reason prefer to keep that branch active, can you please 
> > merge the current master to it, so that the changes in narrow-to-region 
> > will be on the branch?
> 
> Is that feasible?  Non fast forwards are not allowed in the Emacs 
> repository, so rebasing a feature branch is not possible (without using 
> the workaround of deleting and recreating the branch).

I didn't mean a rebase, I meant a merge.  A merge from master to a
feature branch will work exactly as a merge from emacs-28 to master
or, indeed, a merge from a feature branch to master.  There are no
problems here.