2. Evaluate the following code to make the mini-buffer becomes multi-line.

;; https://github.com/gempesaw/ido-vertical-mode.el/blob/master/ido-vertical-mode.el#L45
(setq ido-decorations
      '("\n-> " ; left bracket around prospect list
    "" ; right bracket around prospect list
    "\n " ; separator between prospects, depends on `ido-separator`
    "\n ..." ; inserted at the end of a truncated list of prospects
    "[" ; left bracket around common match string
    "]" ; right bracket around common match string
    " [No match]"
    " [Matched]"
    " [Not readable]"
    " [Too big]"
    " [Confirm]"
    "\n-> " ; left bracket around the sole remaining completion
    "" ; right bracket around the sole remaining completion
    ))
(ido-mode 1)
(global-linum-mode 1)