code: func WmIconGeometrySet(xu *xgbutil.XUtil, win xproto.Window,
  	geom *WmIconGeometry) error {
  
  	rawGeom := make([]uint, 4)
  	rawGeom[0] = uint(geom.X)
  	rawGeom[1] = uint(geom.Y)
  	rawGeom[2] = geom.Width
  	rawGeom[3] = geom.Height
  
  	return xprop.ChangeProp32(xu, win, "_NET_WM_ICON_GEOMETRY", "CARDINAL",
  		rawGeom...)
  }
docs: // _NET_WM_ICON_GEOMETRY set