repoview: move changelog.parentrevs() override to filteredchangelog

Differential Revision: https://phab.mercurial-scm.org/D7246

mercurial/changelog.py

@@ -404,12 +404,6 b' class changelog(revlog.revlog):'
         self.filteredrevs = frozenset()
         self._copiesstorage = opener.options.get(b'copies-storage')
 
-    def parentrevs(self, rev):
-        """filtered version of revlog.parentrevs"""
-        if rev in self.filteredrevs:
-            raise error.FilteredIndexError(rev)
-        return super(changelog, self).parentrevs(rev)
-
     def flags(self, rev):
         """filtered version of revlog.flags"""
         if rev in self.filteredrevs:

mercurial/repoview.py

@@ -319,6 +319,12 b' def wrapchangelog(unfichangelog, filtere'
                 raise error.FilteredIndexError(rev)
             return super(filteredchangelog, self).linkrev(rev)
 
+        def parentrevs(self, rev):
+            """filtered version of revlog.parentrevs"""
+            if rev in self.filteredrevs:
+                raise error.FilteredIndexError(rev)
+            return super(filteredchangelog, self).parentrevs(rev)
+
     cl.__class__ = filteredchangelog
 
     return cl