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

[Eli Zaretskii]

> From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
> Cc: 51016@debbugs.gnu.org,  larsi@gnus.org,  orontee@gmail.com,
>   juri@linkov.net
> Date: Fri, 17 Dec 2021 22:27:59 +0100
> 
> Right, that covers issue (1); do you have an opinion on issue (2)?

It shouldn't be changed by default and unconditionally, IMO.

> (Also FWIW, I'm not surprised such radical-sounding changes are
> surfacing today; given how often outline-mode has made the headlines
> (heh) in NEWS, my impression is that there's been a recent renewal of
> interest in this mode which had not seen much love for the past… however
> long it's been since it has been introduced[1].

>From my POV, there's too much of a tendency to convert Outline to be
Org, and that I cannot support.  People who want to use Org should
just use it; there's no reason to make Outline do the same.