void gdk_disable_multidevice ( void )
Disables multidevice support in GDK. This call must happen prior
gtk_init_check() in order to take effect.
Most common GTK+ applications won’t ever need to call this. Only applications that do mixed GDK/Xlib calls could want to disable multidevice support if such Xlib code deals with input devices in any way and doesn’t observe the presence of XInput 2.