Don't generate git patches that rename a file to multiple destinations
With this patch, instead of generating N renames, we'll generate
1 rename and N-1 copies.
Ideally the rename should come after the copies instead of before
them, but that'd be harder to do.
abort: edit failed: false exited with status 1
transaction abort!
rollback completed
abort: edit failed: false exited with status 1
transaction abort!
rollback completed