t / t4101 / diff.1-2on commit diffcore-rename: don't consider unmerged path as source (d7c9bf2)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,3 +1,2 @@
   4 a
   5-b
   6-c
   7+b
   8\ No newline at end of file