os x: mouse-down for menu bar should stay in flight until after on-demand is called (to avoid getting the menu event handler stuck)
os x: mouse-down for menu bar should stay in flight until after on-demand is called (to avoid getting the menu event handler stuck)

svn: r4948

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket