changegroupsubset(): ancestors() is not inclusive, we need to remove the "heads"

mercurial/localrepo.py

@@ -1398,6 +1398,8 b' class localrepository(repo.repository):'
                 clnode = cl.node(revlog.linkrev(revlog.rev(n)))
                 if clnode in has_cl_set:
                     hasset.add(n)
+            for n in hasset:
+                missingnodes.pop(n, None)
             for r in revlog.ancestors(*[revlog.rev(n) for n in hasset]):
                 missingnodes.pop(revlog.node(r), None)