Stuck pop-up if maximize while pop-up shown.

[dadler]

On OSX Mavericks (and possibly other OSes) if I maximize with Command+Shift+F while a pop-up is displayed, the pop-up is 'stuck' visible. It doesn't pop-down when I move the cursor, press Esc, or even reload the page. The page continues to operate normally except for being partially hidden by the pop-up.

It seems to recover if you hit Command+Shift+F again the exit full-screen and then hover another thumb. Or close the window and then re-open it with Command+Shift+W.