private static void enableDisableLafSync() {
		boolean enabled = !state.getBoolean( KEY_LAF_SYNC, false );
		state.putBoolean( KEY_LAF_SYNC, enabled );

		if( enabled )
			listenToLafChange();
		else if( thread != null) {
			thread.interrupt();
			thread = null;
		}
	}
register Alt+Shift+F1, F2, ... F12 keys to change system scale factor
flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoPrefs.java