bug#17000: setup ido keymaps only once

[Stefan Monnier]

> Currently the ido keymaps are hard to modify because they are recreated
> every time `ido-completing-read' is used.

Indeed, this is wrong.

> I believe it is safe for the "base" ido keymaps to set the value when
> the variable is defined, instead of delaying this until ido is actually
> used, and then redoing that work whenever `ido-completing-read' is
> called.

Agreed.

> -(defvar ido-common-completion-map nil
> +(defvar ido-common-completion-map
> +  (let ((map (make-sparse-keymap)))
[...]
> +    (set-keymap-parent map minibuffer-local-map)
> +    (setq ido-common-completion-map map))

This last line should just be "map)".  Same for the other maps.

Looks good.  Please apply after the trunk re-opens.


        Stefan "Beware: I don't use IDO and don't know its code"