code: func WmIconGeometryGet(xu *xgbutil.XUtil,
  	win xproto.Window) (*WmIconGeometry, error) {
  
  	geom, err := xprop.PropValNums(xprop.GetProperty(xu, win,
  		"_NET_WM_ICON_GEOMETRY"))
  	if err != nil {
  		return nil, err
  	}
  
  	return &WmIconGeometry{
  		X:      int(geom[0]),
  		Y:      int(geom[1]),
  		Width:  geom[2],
  		Height: geom[3],
  	}, nil
  }
docs: // _NET_WM_ICON_GEOMETRY get