preview in wallpaper dialog

[Ivan Čukić]

> Apart for the idea of removing the dialog on which the user is operating, I

+1

> think this is a good idea. It probably overlaps a little with the "apply"
> button, but it's much faster and doesn't require clicks.

This is how konsole does the themes - hover the theme and it is
temporarily applied. And although it can be irritating sometimes, it
really looks and feels nice.

Cheerio