Really fix keyevent_to_string.

qutebrowser/test/utils/test_utils.py

@@ -506,10 +506,10 @@ class KeyEventToStringTests(unittest.TestCase):
                                      Qt.MetaModifier | Qt.ShiftModifier))
         if sys.platform == 'darwin':
             self.assertEqual(utils.keyevent_to_string(evt),
-                            'Ctrl+Alt+Shift+A')
+                             'Ctrl+Alt+Shift+A')
         else:
             self.assertEqual(utils.keyevent_to_string(evt),
-                            'Ctrl+Alt+Meta+Shift+A')
+                             'Ctrl+Alt+Meta+Shift+A')
 
 
 class NormalizeTests(unittest.TestCase):

qutebrowser/utils/utils.py

@@ -442,7 +442,7 @@ def keyevent_to_string(e):
     mod = e.modifiers()
     parts = []
     for (mask, s) in modmask2str.items():
-        if mod & mask:
+        if mod & mask and s not in parts:
             parts.append(s)
     parts.append(key_to_string(e.key()))
     return '+'.join(parts)