_callHandlerIfNeeded(reactAppResponse, event, key, eventType) {
    if (!contains([EventResponse.ignored, EventResponse.handled], reactAppResponse)) {
      this._callHandlerIfExists(event, key, eventType);
    }
  }
If the key event has not been seen by the React application, we ensure that
it's not still waiting for it. This occurs when action handlers bound to keydown
move the focus outside of the react app before it can record the keypress or
keyup