message: check if verifier sasEvent was already set on mount
  this allow the verification panel to fully recover
  the UI state from an on-going verification request
diff: @@ -258,7 +258,11 @@ export default class VerificationPanel extends React.PureComponent {
  };
  componentDidMount() {
  - this.props.request.on("change", this._onRequestChange);
  + const {request} = this.props;
  + request.on("change", this._onRequestChange);
  + if (request.verifier) {
  + this.setState({sasEvent: request.verifier.sasEvent});
  + }
  this._onRequestChange();
  }
  