quartz: filter out button press events on the window frame
quartz: filter out button press events on the window frame

Don't try to handle button press events on the window frame, they
have out-of-window coordinates. Also, break grabs on such events
so popup menus go away.
Patch from Kristian Rietveld, fixes bug 684419.

johne53/MB3Gtk-2,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk,Distrotech/gtk