additional background default alignment to 'right top' (from 'left top') (#9239)

src/olympia/versions/tests/test_utils.py

@@ -68,11 +68,12 @@ def test_additional_background_split_alignment(alignment, alignments_tuple):
         ('top', 'repeat-x', 120, 92, 280, 0),
         ('center', 'repeat-y', 680, 450, 280, -179),
         ('left top', 'repeat', 120, 450, 0, 0),
-        # alignment=None is 'left top'
-        (None, 'repeat', 120, 450, 0, 0),
+        # alignment=None is 'right top'
+        (None, 'repeat', 120, 450, 560, 0),
         # tiling=None is 'no-repeat'
         ('center', None, 680, 92, 280, -179),
-        (None, None, 680, 92, 0, 0),
+        # so this is alignment='right top'; tiling='no-repeat'
+        (None, None, 680, 92, 560, 0),
     )
 )
 def test_additional_background(encode_header_image, alignment, tiling,

src/olympia/versions/utils.py

@@ -77,7 +77,7 @@ class AdditionalBackground(object):
     def __init__(self, path, alignment, tiling, header_root):
         # If there an unequal number of alignments or tiling to srcs the value
         # will be None so use defaults.
-        self.alignment = (alignment or 'left top').lower()
+        self.alignment = (alignment or 'right top').lower()
         self.tiling = (tiling or 'no-repeat').lower()
         self.src, self.width, self.height = encode_header_image(
             os.path.join(header_root, path))