code: func WmStrutGet(xu *xgbutil.XUtil, win xproto.Window) (*WmStrut, error) {
  	struts, err := xprop.PropValNums(xprop.GetProperty(xu, win,
  		"_NET_WM_STRUT"))
  	if err != nil {
  		return nil, err
  	}
  
  	return &WmStrut{
  		Left:   struts[0],
  		Right:  struts[1],
  		Top:    struts[2],
  		Bottom: struts[3],
  	}, nil
  }
docs: // _NET_WM_STRUT get