code: func (win *Window) LayoutSetWidth(width int) {
  	layout := win.layout
  	if layout.Row.Type != layoutStatic || len(layout.Row.WidthArr) > 0 {
  		panic(WrongLayoutErr)
  	}
  	layout.Row.Index2++
  	layout.Row.CalcMaxWidth = false
  	layout.Row.ItemWidth = win.ctx.scale(width)
  }
docs: // LayoutSetWidth adds a new column with the specified width to a static
  // layout.