Allow theming of the completion popup window.

[jordwalke]

I hear there is some special casing in Vico's code that tries to match the color scheme. (I'd love a link to that part of the code). Some might think that's a little too magical (and I agree) but I think most people would definitely settle for it to be controlled by a special colorscheme property. That might be easier as well.

[Shadowfiend]

The relevant code (commented out) is @ https://github.com/vicoapp/vico/blob/master/app/ViCompletionController.m#L64 . There's no clear indication as to why it was commented out, but I'm guessing it wasn't working quite as intended/complete.

Are you thinking a color scheme specifically for the controller, or are you thinking you could specify the colors in all color schemes with a set of properties for the color schemes?

I could go for the latter, where we would fall back on some default properties from the scheme when the special properties weren't present.

[jordwalke]

Yes, the latter (being able to specify them in color schemes) - special properties in the Textmate colorscheme file that no other editor pays regard to.

[Shadowfiend]

Sounds solid. I think it should be reasonably straightforward.