Problem with DragAndDropWrapper and dragging

Hi there,

I’ve just tried to experiment a bit with DragAndDropWrapper and it works well in general except this case:

I have a vertical layout contains a top padding (another small vertical layout) served as a “drag handle” and a table below it.
I can drag by clicking on “drag handle” as expected.
What is un-expected is that, when I click (single-click) on scrollbar of the table, whole component start dragging as when I drag from “drag handle”.
Does it sound like a bug or I just missed some settings?

Below is my content of my window class:

public class DragAndDropPlaygroundWindow extends Window {
	public DragAndDropPlaygroundWindow() {
		VerticalLayout mainLayout = new VerticalLayout();
		mainLayout.setSizeFull();
		setContent(mainLayout);
		
		VerticalLayout dragPane = new VerticalLayout();
		dragPane.setSizeFull();
		DragAndDropWrapper dragBox = new DragAndDropWrapper(dragPane);
		dragBox.setDragStartMode(DragStartMode.WRAPPER);
		dragBox.setSizeFull();
		mainLayout.addComponent(dragBox);
		mainLayout.setExpandRatio(dragBox, 1.0f);
		
		VerticalLayout padding = new VerticalLayout();
		padding.setHeight("15px");
		dragPane.addComponent(padding);
		
		Table table = ArticleUtils.createArticleListTable(200);
		table.setSizeFull();
		dragPane.addComponent(table);
		dragPane.setExpandRatio(table, 1.0f);
	}
}