It is intended for use in customizing Ido for interoperation
with other packages. For instance:
- (add-hook 'ido-minibuffer-setup-hook
+ (add-hook \\='ido-minibuffer-setup-hook
(lambda () (setq-local max-mini-window-height 3)))
will constrain Emacs to a maximum minibuffer height of 3 lines when