code: func (v *View) clearRunes() {
  	maxX, maxY := v.Size()
  	for x := 0; x < maxX; x++ {
  		for y := 0; y < maxY; y++ {
  			termbox.SetCell(v.x0+x+1, v.y0+y+1, ' ',
  				termbox.Attribute(v.FgColor), termbox.Attribute(v.BgColor))
  		}
  	}
  }
docs: // clearRunes erases all the cells in the view.