(setq ido-max-window-height 0.75)
(ido-vertical-mode 1)
(setq ido-vertical-define-keys 'C-n-and-C-p-only)
(require 'flx-ido)
(ido-mode 1)
(ido-everywhere 1)
(flx-ido-mode 1)
;; disable ido faces to see flx highlights.
(setq ido-enable-flex-matching t)
(setq ido-use-faces nil)