code: private Shape decodeInterior(int width, int height) {
          path.reset();
          path.moveTo(1, 1);
          path.lineTo(width - 2, 1);
          path.lineTo(width - 2, height - 3);
          path.lineTo(width - 3, height - 2);
          path.lineTo(3, height - 2);
          path.lineTo(2, height - 3);
          path.closePath();
  
          return path;
      }
docs: Create the button interior shape
  
  @param  width  the width.
  @param  height the height.
  
  @return the shape of the button interior.