message: When selecting reply in thread on a thread response open existing thread
diff: @@ -232,8 +232,19 @@ export default class MessageActionBar extends React.PureComponent<IMessageAction
  action: Action.ViewUserSettings,
  initialTabId: UserTab.Labs,
  });
  + } else if (this.props.mxEvent.isThreadRelation) {
  + showThread({
  + rootEvent: this.props.mxEvent.getThread().rootEvent,
  + initialEvent: this.props.mxEvent,
  + scroll_into_view: true,
  + highlighted: true,
  + push: isCard,
  + });
  } else {
  - showThread({ rootEvent: this.props.mxEvent, push: isCard });
  + showThread({
  + rootEvent: this.props.mxEvent,
  + push: isCard,
  + });
  }
  };
  