diff -r 082d6929fd4d -r 47f00b0de337 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Fri Dec 21 17:19:52 2012 +0100
+++ b/mercurial/localrepo.py	Wed Jan 02 01:36:57 2013 +0100
@@ -652,8 +652,6 @@
 
     def branchmap(self):
         '''returns a dictionary {branch: [branchheads]}'''
-        if self.filtername and not self.changelog.filteredrevs:
-            return self.unfiltered().branchmap()
         branchmap.updatecache(self)
         return self._branchcaches[self.filtername]