Fix issue #5144065: Tap on Music icon from Home screen...

... a different app opens

In some cases when reparenting activities we could end up with a reply
chain that crosses task boundaries, so if an activity below that needs
to be reparented we pull that and the activities above it up into the
new task.

Change-Id: Ia4fa041ab7069e39dac162ddbf5b8e1de98675b9