t / t4135 / diff-with spaces.diffon commit rebase -i: do not invent onelines when expanding/collapsing SHA-1s (1f4044a)
   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