bug#45898: 27.1; wedged in redisplay again

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Gerd Möllmann <gerd.moellmann@gmail.com>,
>   larsi@gnus.org,
>   psainty@orcon.net.nz,  Emacs-hacker2018@jovi.net,  45898@debbugs.gnu.org
> Date: Wed, 29 Jun 2022 12:18:47 -0400
> 
> Eli Zaretskii [2022-06-24 10:57:30] wrote:
> >> Yes, that's exactly what I'm proposing in the paragraph you quoted.
> >> I think it makes sense to bound the growth of the region due to
> >> `font-lock-extend-region-functions`.  We could bound it where we handle
> >> `font-lock-extend-region-functions`, or we could bound it just inside
> >> `font-lock-extend-region-wholelines`.
> >
> > I hope this will be done soon.
> 
> How 'bout the patch below?

Thanks.

> It doesn't seem to make much difference on the `medium_line.json`
> example from Phil, tho :-(

In what case does it make much difference?

And how did you test whether it makes a difference?