repo.changes: fix duplicate changes

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repo.changes: fix duplicate changes

We need to discard the changed and added lists from dirstate.changes
before adding to them when comparing manifests. Otherwise something
that changed from rev->parent->working dir will appear twice.

Bug spotted by Goffredo Baroncelli <[e-mail]>

manifest hash: 64c335e2fe6df6d1ce29d0903f16821c7566768f
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mercurial/hg.py

@@ -686,8 +686,7 b' class localrepository:'
         self.dirstate.forget(remove)
 
     def changes(self, node1, node2, files=None):
-        # changed, added, deleted, unknown
-        c, a, d, u, mf2 = [], [], [], [], None
+        mf2, u = None, []
 
         def fcmp(fn, mf):
             t1 = self.wfile(fn).read()
@@ -727,6 +726,9 b' class localrepository:'
             change = self.changelog.read(node2)
             mf2 = self.manifest.read(change[0])
 
+        # flush lists from dirstate before comparing manifests
+        c, a = [], []
+
         change = self.changelog.read(node1)
         mf1 = self.manifest.read(change[0]).copy()