private void freezeTopItems(LookupElementListPresenter lookup, LinkedHashSet<? extends LookupElement> model) {
    myFrozenItems.clear();
    if (lookup.isShown()) {
      myFrozenItems.addAll(model);
    }
  }
private void freezeTopItems(LookupElementListPresenter lookup, LinkedHashSet<? extends LookupElement> model)