private void refreshRevisionsOrder() {
    final List<VcsFileRevision> list = myHistorySession.getRevisionList();
    myRevisionsOrder.clear();

    int cnt = 0;
    for (VcsFileRevision revision : list) {
      myRevisionsOrder.put(revision.getRevisionNumber(), cnt);
      ++cnt;
    }
  }
private void refreshRevisionsOrder()