t / t4135 / diff-with spaces.diffon commit t/lib-submodule-update: fix "absorbing" test (e5d7e9f)
   1--- post image.txt.orig 2010-08-18 20:13:31.544002255 -0500
   2+++ post image.txt      2010-08-18 20:13:31.544002255 -0500
   3@@ -1 +1 @@
   4-preimage
   5+postimage