getClip method
Returns a description of the clip given that the render object being clipped is of the given size.
Implementation
@override
Path getClip(Size size) => Path()
..moveTo(0, 0)
..lineTo(0, size.height)
..lineTo(0 + depth, size.height + depth)
..lineTo(size.width + depth, size.height + depth)
..lineTo(size.width, size.height)
..lineTo(size.width, 0)
..close();