Resurected code from the punted RootlessPaintBackground/Border and added it conditionally to miPaintWindow (cherry picked from commit cf2e3312cff3f341e9edba8c321a4ca7ffd8748e)
Resurected code from the punted RootlessPaintBackground/Border and added it conditionally to miPaintWindow (cherry picked from commit cf2e3312cff3f341e9edba8c321a4ca7ffd8748e)