code: func RedirectKeyEvents(xu *xgbutil.XUtil, wid xproto.Window) {
  	xu.KeyRedirect = wid
  }
docs: // RedirectKeyEvents, when set to a window id (greater than 0), will force
  // *all* Key{Press,Release} to callbacks attached to the specified window.
  // This is close to emulating a Keyboard grab without the racing.
  // To stop redirecting key events, use window identifier '0'.