code: func CalcClipper(c Control) (int, int, int, int) {
  	w, h := c.Size()
  	x, y := c.Pos()
  	px, py := c.Paddings()
  
  	x = x + px
  	y = y + py
  	w = w - 2*px
  	h = h - 2*py
  
  	return x, y, w, h
  }
docs: // CalcClipper calculates the clipper size based on the control's size, position
  // and paddings