hg revert should revert to parent, not to tip

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

hg revert should revert to parent, not to tip

manifest hash: b6b622d0316f9f7ef60e500fb73844a4b0ad7b69
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (GNU/Linux)

iD8DBQFCx27VywK+sNU5EO8RAnpHAKC1H3GAPC5wYlgpJG7Z7rWPl+vblQCeKVsz
UCjkaDw40evLbltWoY24xQs=
=dmvS
-----END PGP SIGNATURE-----

mercurial/commands.py

@@ -735,8 +735,10 b' def remove(ui, repo, file, *files):'
 
 def revert(ui, repo, *names, **opts):
     """revert modified files or dirs back to their unmodified states"""
-    node = opts['rev'] and repo.lookup(opts['rev']) or repo.changelog.tip()
+    node = opts['rev'] and repo.lookup(opts['rev']) or \
+           repo.dirstate.parents()[0]
     root = os.path.realpath(repo.root)
+
     def trimpath(p):
         p = os.path.realpath(p)
         if p.startswith(root):
@@ -746,8 +748,10 b' def revert(ui, repo, *names, **opts):'
             if p.startswith(os.sep):
                 return rest[1:]
             return p
+
     relnames = map(trimpath, names or [os.getcwd()])
     chosen = {}
+
     def choose(name):
         def body(name):
             for r in relnames: