(resize-minibuffer-frame-exactly): make default t.
(resize-minibuffer-frame-original-height): New variable.
(resize-minibuffer-setup): Set it locally in the minibuffer.
(resize-minibuffer-frame): Use it instead of minibuffer-frame-alist's
height.
(resize-minibuffer-setup): Append resize-minibuffer-window and
resize-minibuffer-frame to the end of post-command-hook, don't insert on
the front.
(resize-minibuffer-window-restore): New function.
(resize-minibuffer-setup): Put it on minibuffer-exit-hook.