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

[Kévin Le Gouguec]

Eli Zaretskii <eliz@gnu.org> writes:

>> (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.

"Org" is a lot of different things, most of them thoroughly unrelated to
outlining that have no business being integrated into outline-mode, so
thanks for keeping an eye on that tendency.

Personally, as an outline(-minor)-mode user, I'm still very happy that
core Emacs developers are attempting to "sideport" the small set of Org
features that pertains to outlining, e.g. TAB-cycling.  That instantly
enhances all major modes with support for outline-minor-mode, so these
are powerful quality-of-life improvements as far as I am concerned.

Whether these features should be enabled by default is a judgment call,
of course.  As a user, I still consider that Emacs tripping over form
feeds when I ask it to go to the next heading is a plain bug, but I
acknowledge that YMMV 🙃