code: func WmFullscreenMonitorsReqExtra(xu *xgbutil.XUtil, win xproto.Window,
  	edges *WmFullscreenMonitors, source int) error {
  
  	return ClientEvent(xu, win, "_NET_WM_FULLSCREEN_MONITORS",
  		edges.Top, edges.Bottom, edges.Left, edges.Right, source)
  }
docs: // _NET_WM_FULLSCREEN_MONITORS req extra