message: Persist breadcrumb state between sessions
  Fixes
diff: @@ -35,14 +35,32 @@ export default class RoomBreadcrumbs extends React.Component {
  componentWillMount() {
  this._dispatcherRef = dis.register(this.onAction);
  +
  + const roomStr = localStorage.getItem("mx_breadcrumb_rooms");
  + if (roomStr) {
  + try {
  + const roomIds = JSON.parse(roomStr);
  + this.setState({
  + rooms: roomIds.map((r) => {
  + return {
  + room: MatrixClientPeg.get().getRoom(r),
  + animated: false,
  + };
  + }).filter((r) => r.room),
  + });
  + } catch (e) {
  + console.error("Failed to parse breadcrumbs:", e);
  + }
  + }
  }
  componentWillUnmount() {
  dis.unregister(this._dispatcherRef);
  }
  - componentDidUpdate() {
  + componentDidUpdate(props, state) {
  const rooms = this.state.rooms.slice();
  +
  if (rooms.length) {
  const {room, animated} = rooms[0];
  if (!animated) {
  @@ -50,6 +68,9 @@ export default class RoomBreadcrumbs extends React.Component {
  setTimeout(() => this.setState({rooms}), 0);
  }
  }
  +
  + const roomStr = JSON.stringify(rooms.map((r) => r.room.roomId));
  + localStorage.setItem("mx_breadcrumb_rooms", roomStr);
  }
  onAction(payload) {
  