code: func WmHintsSet(xu *xgbutil.XUtil, win xproto.Window, mh *Hints) error {
  	raw := []uint{mh.Flags, mh.Function, mh.Decoration, mh.Input, mh.Status}
  	return xprop.ChangeProp32(xu, win, "_MOTIF_WM_HINTS", "_MOTIF_WM_HINTS",
  		raw...)
  }
docs: // _MOTIF_WM_HINTS set