title: JavaFX - move window with effect
body: <p>I have undecorated non-fullscreen window, which I like to move outside screen boundaries when mouse leaves it's area, but do so smoothly. I found some JavaFX functionality to do so - Timeline, but KeyValue for that Timeline doesn't supports stage.xProperty - because this property is readonlyProperty. Is there way to move my window smoothly using JavaFX functions?  </p>