Data labels in pie chart won't wrap

When I add data to pie chart with long label the label won't wrap to several lines but labels are cut instead. Same problem occurs with legend. How I can fix this? See code below and attached screenshot.

I'm using Vaadin 6.8.15 and Vaadin Charts 1.1.9

public class TestWindow extends Window {

  private static final long serialVersionUID = 1L;

  public TestWindow() {
    super();
    setWidth(400, UNITS_PIXELS);

    final Chart chart = new Chart();
    chart.setSizeFull();
    final Configuration conf = chart.getConfiguration();
    conf.getChart().setType(ChartType.PIE);

    final DataSeries series = new DataSeries();
    series.add(new DataSeriesItem("Item with not so long title", 0.4f));
    series.add(new DataSeriesItem("Item with also not so long title", 0.6f));
    conf.setSeries(series);

    addComponent(chart);
  }
}