diff -r a29f071751df -r 64c1955a0461 mercurial/revset.py
--- a/mercurial/revset.py	Thu May 05 09:26:09 2016 +0000
+++ b/mercurial/revset.py	Tue May 03 12:36:44 2016 +0900
@@ -386,9 +386,7 @@
     r = fullreposet(repo)
     xs = reachableroots(repo, getset(repo, r, x), getset(repo, r, y),
                          includepath=True)
-    # XXX We should combine with subset first: 'subset & baseset(...)'. This is
-    # necessary to ensure we preserve the order in subset.
-    return xs & subset
+    return subset & xs
 
 def andset(repo, subset, x, y):
     return getset(repo, getset(repo, subset, x), y)