486fdb5596
This thing needs to be rewritten. It's grown too complicated for what it's doing, and I don't like the physics anyway. Also, this leaves the bug where if you press back while it's animating down, the animation is ignored. However it no longer jumps down all the way, it just essentially ignores the back key. Also, this makes the collapse get executed on the back key up event, so it works with the swipe on the soft keys at the bottom of the screen.