t / t4101 / diff.1-3on commit t3200: Add test demonstrating minor regression in 41c21f2 (62d94a3)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,3 +1,3 @@
   4 a
   5-b
   6 c
   7+b
   8\ No newline at end of file