Re: Highly inconsistent diff UI

Junio C Hamano wrote:

Yeah, I am not strongly opposed to have something like that, and
having a shorter (but not a single letter) option name might make it
more attractive than A...B at least to new users.

I'm not married to the single character or tilde.  What I'm saying is
that we should make it a rev spec, not a command-line option.

Which by the way is nothing new.  "A" means the entire history
leading to the commit "A" in the context of specifying a range, and
the same "A" means a single commit "A" in the context of specifying
a revision.

Exactly.  And I'm introducing a third context: "when specifying two
trees to diff".  Changing meaning in different contexts is not a
problem, as long as it is consistent and properly documented.