bug#51016: 28.0.50; 'diff-font-lock-prettify' breaks display of outline headers

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Thu, 16 Dec 2021 19:22:28 +0200
> Cc: 51016@debbugs.gnu.org, Matthias Meulien <orontee@gmail.com>
> 
> >> This begs the question: why outline-regexp includes ‘^L’?
> >
> > Yes, I wondered about that, too.
> 
> I guess no one will notice the absence of ^L because
> the default outline-regexp used by everyone in org-mode is
> "\\*+ "

Why are you talking about Org, when the proposed change is in
outline.el?

Please don't change the behavior of outline.el in
backward-incompatible ways.  This is used for NEWS and similar files,
and those do have ^L separators in them.