test: disable the new style rendering for "missing parent"
The style kicks in when we display a partial tree. Supporting test running both
3.7 and default with this is painful, we disable the new feature for now.
--- a/tests/test-topic.t Mon Mar 21 21:39:14 2016 -0700
+++ b/tests/test-topic.t Wed Mar 30 03:56:14 2016 -0700
@@ -6,6 +6,11 @@
> [phases]
> publish=false
> EOF
+ $ cat <<EOF >> $HGRCPATH
+ > [experimental]
+ > # disable the new graph style until we drop 3.7 support
+ > graphstyle.missing = |
+ > EOF
$ hg help topics
hg topics [TOPIC]