Reorder BoxLayout padding property.

kivy/uix/boxlayout.py

@@ -76,16 +76,11 @@ class BoxLayout(Layout):
     '''
 
     padding = VariableListProperty([0, 0, 0, 0])
-    '''Padding between layout box and children, in pixels.
+    '''Padding between layout box and children: [padding_left, padding_top,
+    padding_right, padding_bottom].
 
-    padding[0] represents the top padding, padding[1] the right padding,
-    padding[2] the bottom padding and padding[3] the left padding.
-
-    If padding is given only two arguments, the first will represent top and
-    bottom padding, and the second left and right padding.
-
-    If padding is given only one argument, it will represent all four
-    directions.
+    padding also accepts a two argument form [padding_horizontal,
+    padding_vertical] and a one argument form [padding].
 
     .. versionchanged:: 1.7.0
 
@@ -123,10 +118,10 @@ class BoxLayout(Layout):
         selfy = self.y
         selfw = self.width
         selfh = self.height
-        padding_top = self.padding[0]
-        padding_right = self.padding[1]
-        padding_bottom = self.padding[2]
-        padding_left = self.padding[3]
+        padding_left = self.padding[0]
+        padding_top = self.padding[1]
+        padding_right = self.padding[2]
+        padding_bottom = self.padding[3]
         spacing = self.spacing
         orientation = self.orientation
         padding_x = padding_left + padding_right