Update ordered_multimap.py

ordered_multimap.py

@@ -1,6 +1,11 @@
 from weakref import WeakValueDictionary
 from collections import defaultdict
 
+class StringWrapper:
+    def __init__(self, s):
+        self.s = s
+
+
 class OrderedMultiIndexMapWeakRef:
     def __init__(self):
         self.data = []
@@ -9,9 +14,9 @@ class OrderedMultiIndexMapWeakRef:
     def insert(self, id, text, title: str = None, sub_title: str = None):
         self.data.append(text)
         if (title is not None) and (sub_title is not None):
-            self.index_list.append((id, WeakValueDictionary({'title': title, 'sub_title': sub_title})))
+            self.index_list.append((id, WeakValueDictionary({'title': StringWrapper(title), 'sub_title': StringWrapper(sub_title)})))
         elif (title is not None) and (sub_title is None):
-            self.index_list.append((id, WeakValueDictionary({'title': title})))
+            self.index_list.append((id, WeakValueDictionary({'title': StringWrapper(title)})))
         else:
             self.index_list.append(id)