anchor.diff:      assert(_yRadius != null);
     }
   
  -  /// The radius of the rounded corners in the horizontal direction
  +  /// The radius of the rounded corners in the horizontal direction in logical pixels
     ///
     /// Values are clamped to be between zero and half the width of the render
     /// object.
  
positive.code: ///
  /// The width of this render object is the largest width permited by the layout
  /// constraints. The height of the render object is determined by applying the
  /// given aspect ratio to the width.
  ///
  /// The aspect ratio is expressed as a ratio of width to height. For example,
  /// a 16:9 width:height aspect ratio would have a value of 16.0/9.0.
  class RenderAspectRatio extends RenderProxyBox {
    RenderAspectRatio({
      RenderBox child,
  
negative.code:     markNeedsPaint();
    }
  
    /// The radius of the rounded corners in the vertical direction in logical pixels
    ///
    /// Values are clamped to be between zero and half the height of the render
    /// object.
  