Hello. I recently noticed that Bazaar's unified_diff() was emiting ---/+++ lines with a trailing whitespace if fromfiledate/tofiledate were the empty string. (Which was bad because a program to detect spurious trailing whitespace in diffs would flag them as errors.) A patch [1] was committed recently in their tree. During the discussion, it was pointed out that the affected function was a copy of Python's own unified_diff() in difflib, which suffered the same problem. [1]: http://bazaar.launchpad.net/~bzr/bzr/trunk/revision/3923 I'm now attaching a patch to fix this issue in Python. It'd be great if you'd consider applying it. (It seems that the correct character to separate dates is a tab and not a space; if you feel changing this is breaking backwards compatibility, feel free to s/\t/ / in my patch.) Thanks.
