79a80,86> def _index(self, refChild):> if self._index_cache>= 0 and self._index_cache < len(self.childNodes) \> and self.childNodes[self._index_cache] == refChild:> return self._index_cache> self._index_cache = self.childNodes.index(refChild)> return self._index_cache> 95c102 < index = self.childNodes.index(refChild) ---> index = self._index(refChild) 100a108> self._index_cache += 1 142c150 < index = self.childNodes.index(oldChild) ---> index = self._index(oldChild) 332a341> self._index_cache = -1 649a659> self._index_cache = -1 1308a1319> self._index_cache = -1 1501a1513> self._index_cache = -1