When files are unmerged they can show up as both unmerged and
modified in the output of `git diff --raw`. This causes
difftool's dir-diff to create filesystem entries for the same
path twice, which fails when it encounters a duplicate path.
Ensure that each worktree path is only processed once.
Add a test to demonstrate the breakage.
Reported-by: Jan Smets <jan@smets.cx> Signed-off-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>