fixup! fix: fix tab-space mix with tab indenation and continuation_align_style=SPACE

Author: spaceone

yapf/yapflib/format_token.py

@@ -77,7 +77,7 @@ def _TabbedContinuationAlignPadding(spaces, align_style, tab_width):
     if spaces > 0:
       return '\t' * int((spaces + tab_width - 1) / tab_width)
     return ''
-  if spaces % tab_width == 0:
+  if tab_width > 1 and spaces % tab_width == 0:
     return '\t' * (spaces // tab_width)
   return ' ' * spaces  # TODO: add a comment why we indent with spaces in a tab area?
 

yapftests/yapf_test.py

@@ -1268,8 +1268,8 @@ def f():
     expected_formatted_code = """\
 def f():
 	return [
-		'hello',
-		'world',
+	    'hello',
+	    'world',
 	]
 """
     style_contents = u"""\