Like a lot of window managers, Kwin lets you move windows by holding Alt and dragging them with button 1 on your mouse. This is really great... Until you're in Virtualbox and you try to move a guest window and accidentally de-fullscreen Virtualbox and mess up all your icons on your desktop.
It's annoying. Is there a way to selectively turn it off? The Kwin actions dialogue doesn't seem to have anything for advanced settings.
Perhaps there's a way to make Virtualbox "eat" the Alt key when the mouse is over it? I'd be just as happy with a Virtualbox specific answer because that's the only scenario that really causes me grief.