Apply batched suggestions from code review

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Author: serhiy-storchaka

Lib/idlelib/editor.py

@@ -1194,7 +1194,7 @@ def apply_bindings(self, keydefs=None):
                 # the sequences with the other case too (gh-56596).
                 for keys in keylist:
                     other = _letter_key_re.sub(lambda m: m[0].swapcase(), keys)
-                    if other != keys:
+                    if other not in keylist:
                         text.event_add(event, other)
 
     def fill_menus(self, menudefs=None, keydefs=None):

Lib/idlelib/idle_test/test_editor.py

@@ -36,8 +36,8 @@ def test_apply_bindings_caps_lock(self):
         # sequences are bound with both cases.
         e = Editor(root=self.root)
         try:
-            e.apply_bindings({'<<spam>>': ['<Control-Key-s>', '<Key-F1>'],
-                              '<<eggs>>': ['<Control-Key-x><Alt-Shift-Key-S>']})
+            e.apply_bindings({'<<spam>>': ('<Control-Key-s>', '<Key-F1>'),
+                              '<<eggs>>': ('<Control-Key-x><Alt-Shift-Key-S>',)})
             self.assertEqual(set(e.text.event_info('<<spam>>')),
                              {'<Control-KeyPress-s>', '<Control-KeyPress-S>',
                               '<KeyPress-F1>'})