#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.
diff --git a/Misc/NEWS b/Misc/NEWS
index fe5d84c..8c80bc2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -24,6 +24,9 @@
 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.