icomplete-vertical above prompt

[Gregory Heytings]

> I wonder how easy would be to improve Icomplete to display completions 
> in the standard buffer *Completions* instead of the minibuffer? Then 
> both use cases will be covered:
>
> 1. icomplete-vertical-mode for users who prefer vertical completions in 
> the minibuffer;
>
> 2. vertical completions in *Completions* for users who don't like when 
> the mode-line jumps up and down when completing.

Note that this doesn't happen with the default resize-mini-windows value, 
which is grow-only.  It jumps up once, and will not jump down until the 
end of the completion.

> In this case the same icomplete keys could be used to navigate 
> completions in the *Completions* buffer from the minibuffer with 
> icomplete-forward-completions and icomplete-backward-completions, and 
> icomplete-force-complete-and-exit to accept the selected completion.

By popular demand (Stefan M asked for something similar some time ago 
IIRC), here is a patch that does what you want, but not exactly how you 
described it.  It displays completion candidates above the prompt instead 
of below the prompt, and you can navigate them from the minibuffer.

Add-option-to-display-candidates-above-prompt-with-i.patch
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