message: unrelated fix: rerender hidden event tile when decrypted
  to get accurate type
diff: @@ -32,6 +32,13 @@ export default class ViewSourceEvent extends React.PureComponent {
  };
  }
  + componentDidMount() {
  + const {mxEvent} = this.props;
  + if (mxEvent.isBeingDecrypted()) {
  + mxEvent.once("Event.decrypted", () => this.forceUpdate());
  + }
  + }
  +
  onToggle = (ev) => {
  ev.preventDefault();
  const { expanded } = this.state;
  