Update test_posttraverse to match expanding order

test/test_rendertileset.py

@@ -144,46 +144,46 @@ class RendertileSetTest(unittest.TestCase):
         """Test a post-traversal of the tree's dirty tiles"""
         # Expect these results in this proper order.
         expected_list = [
-            (0,0,0),
+            (0,0,3),
             (0,0,1),
             (0,0,2),
-            (0,0,3),
+            (0,0,0),
             (0,0),
             (0,),
 
+            (1,2,0),
+            (1,2),
+
             (1,0,3),
             (1,0),
 
             (1,1,3),
             (1,1),
-
-            (1,2,0),
-            (1,2),
             (1,),
 
-            (2,0,0),
-            (2,0,1),
-            (2,0,2),
-            (2,0,3),
-            (2,0),
-
-            (2,1,0),
             (2,1,1),
-            (2,1,2),
+            (2,1,0),
             (2,1,3),
+            (2,1,2),
             (2,1),
 
-            (2,2,0),
-            (2,2,1),
-            (2,2,2),
-            (2,2,3),
-            (2,2),
+            (2,0,1),
+            (2,0,3),
+            (2,0,0),
+            (2,0,2),
+            (2,0),
 
-            (2,3,0),
             (2,3,1),
-            (2,3,2),
+            (2,3,0),
             (2,3,3),
+            (2,3,2),
             (2,3),
+
+            (2,2,1),
+            (2,2,0),
+            (2,2,3),
+            (2,2,2),
+            (2,2),
             (2,),
 
             # We should expect the root tile to need rendering too.