Better vertical-ness in ido-mode?

[Steven Degutis <sbdegutis@gmail.com>]

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Currently I use this code on emacswiki (
http://emacswiki.org/emacs/InteractivelyDoThings#toc20) for making ido-mode
vertical. It's much easier to visually parse than horizontal mode. But ido
wasn't meant to be done vertically, so some things are a bit strange.

For example, if you've typed enough to narrow it down to one candidate, it
shows up on the same line as what you're typing, instead of the line below
it like it would if there were at least two candidates. Changing the 5th
element of ido-decorations to show up on the next line isn't a legitimate
solution because sometimes that's used to visually wrap around a partial
match, which ends up looking very confusing and strange on the next line.

How hard would it be to change/edit/hack ido-mode to work more naturally
when showing results vertically, maybe as an official option of ido-mode,
or a fork?

I've tried helm, and it's way too overkill for this small task. It's much
too heavyweight, uses buffers and leaves them sitting around, and does way
too many things. Now ido-mode is *almost* perfect for completion and
narrowing when used vertically. It just has a few quirks because it was
never imagined to be used this way by the developers.

-Steven

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