Previously, turning the screen off with the panel expanded would
run one time through panelExpansionChanged, leaving the background
in an intermediate state.
This has probably been around for a while, only uncovered now
that we can see it (if the status bar is translucent).
Bug:11357145
Change-Id: I55b768696c8791f82265a61d2c0f665503ad8bb0
c19418e3f5