#4455: IDLE failed to display the windows list when two windows have the same title.

Windows objects cannot be compared, and it's better to have a consistent order;
so We add the window unique ID to the sort key.

Reviewed by Benjamin Peterson.

Lib/idlelib/WindowList.py

@@ -26,9 +26,9 @@ def add_windows_to_menu(self,  menu):
                 title = window.get_title()
             except TclError:
                 continue
-            list.append((title, window))
+            list.append((title, key, window))
         list.sort()
-        for title, window in list:
+        for title, key, window in list:
             menu.add_command(label=title, command=window.wakeup)
 
     def register_callback(self, callback):

Misc/NEWS

@@ -24,6 +24,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #4455: IDLE failed to display the windows list when two windows have
+  the same title.
+
 - Issue #3741: DISTUTILS_USE_SDK set causes msvc9compiler.py to raise an
   exception.