Mac using double click to toggle fullscreen mode not receive last release event

Whenever the visibility state of the application changes(enter or leave), the user must click in the window one more time before the window mode can change again, just like the application loses the mouse focus.

I tracked the mouse event of traditional widget, and found the problem: the double click event consisted of two click event(press-release-press-release), when the window state changd(fullscreen to normal or normal to fullscreen), the last RELEASE event will never be received UNLESS click one more time.

see this: http://stackoverflow.com/questions/30187575/qml-mac-fullscreen-mode-lose-mouse-focus