RangeSlider - high thumb & rangeBar missing

[qtran]

There is a bug in RangeSlider that when you change the tick marks / labels visibility the high thumb & rangeBar missing
How to reproduce:

public class TestApplication extends Application {

    public static void main(final String[] args) {
	launch(args);
    }

    @Override
    public void start(final Stage primaryStage) {
	primaryStage.setTitle("TestApplication");

	final RangeSlider slider = new RangeSlider(0, 10, 2, 8);
	final Button btn = new Button();
	btn.setText("Toggle show tick labels'");
	btn.setOnAction(event -> slider.setShowTickLabels(!slider.isShowTickLabels()));

	final VBox root = new VBox(20);
	root.getChildren().addAll(slider, btn);
	root.setAlignment(Pos.CENTER);

	primaryStage.setScene(new Scene(root, 300, 250));
	primaryStage.show();
    }
}

Tested with 11.1.2