message: Fix share dialog correctly
  componentDidMount fires too late for this dialog, so we need to set ourselves up in the constructor.
  Fixes
diff: @@ -70,9 +70,16 @@ export default class ShareDialog extends React.Component {
  this.onCopyClick = this.onCopyClick.bind(this);
  this.onLinkSpecificEventCheckboxClick = this.onLinkSpecificEventCheckboxClick.bind(this);
  + let permalinkCreator: RoomPermalinkCreator = null;
  + if (props.target instanceof Room) {
  + permalinkCreator = new RoomPermalinkCreator(props.target);
  + permalinkCreator.load();
  + }
  +
  this.state = {
  // MatrixEvent defaults to share linkSpecificEvent
  linkSpecificEvent: this.props.target instanceof MatrixEvent,
  + permalinkCreator,
  };
  this._link = createRef();
  @@ -121,14 +128,6 @@ export default class ShareDialog extends React.Component {
  });
  }
  - componentDidMount() {
  - if (this.props.target instanceof Room) {
  - const permalinkCreator = new RoomPermalinkCreator(this.props.target);
  - permalinkCreator.load();
  - this.setState({permalinkCreator});
  - }
  - }
  -
  componentWillUnmount() {
  // if the Copied tooltip is open then get rid of it, there are ways to close the modal which wouldn't close
  // the tooltip otherwise, such as pressing Escape or clicking X really quickly
  