Space bar shortcut does not work when play panel window is in foreground
The label on the play button on the play panel says "Start or stop playback (Space)". However, nothing happens when the Space Bar is pressed when the Play Panel was the last window to have been clicked on. The bug is that the (Space) hint is incorrect since it does not work. Rather than removing the (Space) hint, a much more useful fix would be to honor the Space Bar event when the Play Panel is the active window.