Update ordered_multimap.py

ordered_multimap.py

@@ -16,11 +16,8 @@ class OrderedMultiIndexMapWeakRef:
         else:
             return [self.data[i][1] for i in self.keyless_values]
 
-    def items(self):
-        result = defaultdict(list)
-        for key, value in self.data:
-            result[key].append(value)
-        return result.items()
+    def all_titles(self):
+        return self.index_list
 
     def all_texts(self):
         return self.data