With prefix argument ARG, turn on if positive, otherwise off.
Returns non-nil if the new state is enabled."
:global t
+ ;; We'd like to use custom-initialize-set here so the setup is done
+ ;; before dumping, but at the point where the defcustom is evaluated,
+ ;; the corresponding function isn't defined yet, so
+ ;; custom-initialize-set signals an error.
+ :initialize 'custom-initialize-delay
:init-value t
:group 'minibuffer
:version "22.1"