6/9 Without var_DelCallBack: gui/macosx/intf.m
var_AddCallback( p_playlist, "fullscreen", FullscreenChanged, self);
var_AddCallback( p_intf->p_libvlc, "intf-toggle-fscontrol", ShowController, self);
var_AddCallback( p_input, "intf-event", InputEvent, [VLCMain sharedInstance] );