customization warnings 2

[jsirex]

Relates to #88

line 253:

(defcustom switch-window-shortcut-style 'quail
  "Use either keyboard layout or alphabet shortcut style."
  :type '(choice (const :tag "Alphabet" 'alphabet)
                 (const :tag "Keyboard Layout" 'quail)
                 (const :tag "Qwerty Homekeys Layout" 'qwerty))
  :group 'switch-window)