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

[Eli Zaretskii]

> Date: Fri, 29 Jul 2022 10:50:02 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: gerd.moellmann@gmail.com, 56682@debbugs.gnu.org, larsi@gnus.org, 
>     monnier@iro.umontreal.ca
> 
> 
> >> In this case, "arbitrarily large" contradicts the text that follows, 
> >> which describes the circumstances where that might not be true.
> >
> > I've carefully chosen the words of the title, and it doesn't contradict 
> > what follows, as far as I understand.  It says "Emacs is now capable of 
> > editing files with arbitrarily long lines", in which "capable" means 
> > that it can do it, but will not always do it.  The circumstances that 
> > are described in the text that follows tell the reader that the 
> > remaining cases in which Emacs would choke on such files are outside of 
> > Emacs' responsibility, they are the responsibility of major and minor 
> > mode writers.
> 
> I see that you've already reverted.  Sigh.

I didn't revert.  I've changed back only some parts of the changes you
made, and left others as you changed them.