bug#53158: 28.0.90; TAB, RET key behave differently for Git-Log-View, Outline View mode

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  53158@debbugs.gnu.org
> Date: Mon, 10 Jan 2022 21:52:44 +0200
> 
> Then you can choose: when point is at the beginning of the outline heading,
> TAB can expand and collapse outlines, when point is not at the line beginning,
> TAB moves to the next hunk.

FWIW, I consider this not a good UI.  Having point one column to the
left or to the right of where you want to be is quite frequent, so
making a key sequence produce a very different effect depending on
that is far from being the best idea, IMO.

To me, this tells that these two modes, and the user expectations and
habits to go with them, are simply incompatible, and we shouldn't try
mixing them.  If someone wants a diff-mode-like outline mode, let's
make such a mode, and leave the original diff-mode alone.