obshistory: omit keyword arguments with default values in patch.diffui() calls d4c9eebdd72d made that function not take "relroot" and "prefix" anymore, and instead expect "pathfn". These two chunks of code in this patch simply generate patches for obslog -p and they broke because they tried to provide default values for "prefix" and "relroot" for no apparent reason (and also for "changes"). Let's instead rely on defaults of patch.diffui().

#!/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 extensions
cat >> $HGRCPATH << EOF
[experimental]
evolution=createmarkers,exchange

[extensions]
rebase=
topic=
EOF