obsfate: fix changeset description diff computing
Mercurial core 8b6dd3922f70 changed the mdiff.unidiff API. Add a new compat
method for all supported Mercurial versions.
#!/bin/sh.$TESTDIR/testlib/pythonpath.sh# This file holds logic that is used in many tests.# It can be called in a test like this:# $ . "$TESTDIR/testlib/topic_setup.sh"# Enable obsolete markers and enable extensionscat>>$HGRCPATH<< EOF[experimental]evolution=createmarkers,exchange[extensions]rebase=topic=EOF