Linus Torvalds [off-list ref] writes:
Ouch. I thought that commit wasn't _supposed_ to make any difference.
If it does, then that sounds like a bad bug. Junio?
It already has been reverted.
I haven't really looked at the issue yet, but for one thing it seemed to
break synthesis of the virtual common tree inside merge-recursive for some
reason, and ends up producing a lot more diffs than necessary between the
common and the tips being merged.