Hi,
Currently, git-diff accepts
git-diff A..B
syntax, and the output seems to be equivalent of 'git-diff A B'.
IMHO, this conflicts with A..B semantics defined for git-log family of commands.
Consider following tree
O--X--Y--A1--A2 (a)
\
B1--B2 (b)
The command 'git log a..b' will show B1,B2, so I would find it
intuitive (and useful) to have 'git diff a..b' show B1+B2,
rather than -A2-A1+B1+B2.
So, I suggest to change semantics of 'git diff a..b'
to 'git diff `git-merge-base a b` b'.
I could contribute the documentation change if the idea is accepted and implemented.
Thanks a lot!
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