black window drawn on second display with 0 alpha blacks out Mission Control preview
This is an issue observed on Mac OS X versions 10.8 and 10.9
Steps to reproduce:
- Have a multi-monitor setup of at least two displays.
- Play a video and take it full screen. Primary display shows video. Secondary display gets black window overlay.
- Exit full screen. Everything looks normal. But black window on secondary display is still there with 0 alpha.
- Enter Mission Control. Mission Control preview of previously blacked-out space remains black, even though that space is actually not hidden by the 0 alpha black window.
The black window should not be left open covering the secondary display when out of full screen mode.