Follow up to bug 2195678. This was one of the reprocussions that
I was worried about with respect to that bug, so I'm counting
Dr. No on that change as the one for this one.
Bug 2195678
We had all this stuff there to keep the notification view
around so it doesn't need to be reconstructed each time,
and we weren't using it. This fixes that, and it looks
much better now.
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.
Now we have a 5-second time after home is pressed, during which
only the home app (and the status bar) can switch to another app.
After that time, any start activity requests that occurred will
be executed, to allow things like alarms to be displayed. Also
if during that time the user launches another app, the pending
starts will be executed without resuming their activities and
the one they started placed at the top and executed.
