anchor.diff:          _textTheme.body1,
           [new PlainTextSpan("${gridline.value}")]
         );
  -      gridline.labelPainter = new ParagraphPainter(text)
  +      gridline.labelPainter = new TextPainter(text)
           ..maxWidth = _rect.width
           ..layout();
         _horizontalGridlines.add(gridline);
  
positive.code: class Indicator {
    Point start;
    Point end;
    ParagraphPainter labelPainter;
    Point labelPosition;
  }
  
  class ChartPainter {
    ChartPainter(ChartData data) : _data = data;
  
    ChartData _data;
    ChartData get data => _data;
  
negative.code: 
  class Gridline {
    double value;
    TextPainter labelPainter;
    Point labelPosition;
    Point start;
    Point end;
  