Shadow for a top slider leads to visible artifacts on activity creation
It looks strange: when my Activity is shown for the first time, the top slider I have on the layout reveals a few pixels too much on top for a very short time. You can see that the shadow is added underneath the slider and then this gap is filled because the shadow "pushes" the content up. That looks awkward and not nice.
How can we prevent that the user sees how the shadow is added?
This problem is only visible for top sliders, not bottom. This first screenshot shows the layout at the moment of display - see the top slider's visible portion "Start: ...." and a small grey gap between it and the action bar.

Shortly after this is visible, the shadow appears below and pushes the visible portion up so you cannot see the gap any more:
