[ListView] List with focusTraversable=false can get focus anyway

Unfocusable ListView can get focused by clicking on its scroll bar.

Code to reproduce the issue:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.stage.Stage;

public class ListViewFocus extends Application
{

@Override
public void start(final Stage stage) throws Exception
{
final ListView<String> listView = new ListView<>();
listView.setPrefHeight(150.0);
listView.getItems().addAll("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o");
listView.setFocusTraversable(false);

stage.setScene(new Scene(listView));
stage.show();
}

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

}

To see the problem, click on the ListView vertical scroll bar.