Comment 2 for bug 337394

I believe that I can confirm this defect, which is still listed as New. If you take the documented sample that is supposed to show the "correct" way to use append notification, and add a second copy of the notification bubble, you will see that instead of merging the two bubbles, they are independently queued.

--- append-hint-example.py.original 2009-03-26 10:12:06.000000000 +0100
+++ append-hint-example.py 2009-03-26 10:13:00.000000000 +0100
@@ -136,6 +136,15 @@
      "Phil owned the place like no one before him!",
      "notification-message-IM")
   n.show ()
+ n = pynotify.Notification ("Cole Raby",
+ "Hey Bro Coly!",
+ "notification-message-IM")
+ n.set_hint_string ("x-canonical-append", "allowed");
+ n.show ()
+ n.update ("Cole Raby",
+ "Phil owned the place like no one before him!",
+ "notification-message-IM")
+ n.show ()
  else:
   print "The daemon does not support the append-hint!"