Jay Soffian [off-list ref] writes:
I actually think a better choice would be to remove commit_tree() from
merge and always have it run commit externally. I'm not seriously
suggesting that be done, but it would make git more consistent. But
I'm not going to send in a patch which makes the situation worse.
Think about it. What I suggested does no way make the situation
worse. Your patch _does_ make it worse by changing the hook behaviour
between "merge -m 'foo'" vs "merge -m 'foo' -e".