t / t4135 / diff-with backslash.diffon commit refs: use `size_t` indexes when iterating over ref transaction updates (43a2dfd)
   1--- post\image.txt.orig 2010-08-18 20:13:31.680002255 -0500
   2+++ post\image.txt      2010-08-18 20:13:31.680002255 -0500
   3@@ -1 +1 @@
   4-preimage
   5+postimage