VerticalLayoutContainer does not calculates own height properly.

VerticalLayoutContainer does not calculates own height properly if any margin specified. It seems that margins are not getting included into overall height.

Code:

    public void onModuleLoad() {
        VerticalLayoutContainer parentContainer = new VerticalLayoutContainer();
        RootPanel.get().add(parentContainer);
        
        VerticalLayoutContainer childContainer = new VerticalLayoutContainer();
        parentContainer.add(childContainer);
        // To make the containers boundries visible
        childContainer.getElement().getStyle().setBackgroundColor("red");
        
        TextField firstName = new TextField();
        childContainer.add(new FieldLabel(firstName, "First Name"), new VerticalLayoutData(-1, -1, new Margins(6)));
        
        TextField lastName = new TextField();
        childContainer.add(new FieldLabel(lastName, "Last Name"), new VerticalLayoutData(-1, -1, new Margins(6)));
    }

As you see contents are getting out of the container boundaries. This will make very hard to place something next/after to the container.

Output:

theproblem.jpg