bug#57804: An infinite loop in a `fontify-region' function causes Emacs to hang indefinitely

[Eli Zaretskii]

> Cc: Lars Ingebrigtsen <larsi@gnus.org>, 57804@debbugs.gnu.org
> Date: Thu, 15 Sep 2022 20:26:54 +0000
> From: Gregory Heytings <gregory@heytings.org>
> 
> > For you this long-line optimization is probably very important, maybe 
> > you often work with files that trigger this and make using Emacs a pain 
> > without it.
> 
> It isn't for me personally, no.  It is important for Emacs users.

Indeed, the complaints about Emacs behavior with very long lines are
abundantly seen on the Internet and in our bug database.