public LookupImpl(Project project, Editor editor, @NotNull LookupArranger arranger) {
    super(new JPanel(new BorderLayout()));
    setForceShowAsPopup(true);
    setCancelOnClickOutside(false);
    setResizable(true);
    AbstractPopup.suppressMacCornerFor(getComponent());

    myProject = project;
    myEditor = editor;
    myArranger = arranger;
    myPresentableArranger = arranger;

    myCellRenderer = new LookupCellRenderer(this);
    myList.setCellRenderer(myCellRenderer);

    myList.setFocusable(false);
    myList.setFixedCellWidth(50);

    myList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    myList.setBackground(LookupCellRenderer.BACKGROUND_COLOR);

    myList.getExpandableItemsHandler();

    myAdComponent = new Advertiser();

    myOffsets = new LookupOffsets(editor);

    final CollectionListModel<LookupElement> model = getListModel();
    addEmptyItem(model);
    updateListHeight(model);

    addListeners();
  }
  private boolean updateList(boolean onExplicitAction, boolean reused) {
    if (!ApplicationManager.getApplication().isUnitTestMode()) {
      ApplicationManager.getApplication().assertIsDispatchThread();
    }
    checkValid();

    CollectionListModel<LookupElement> listModel = getListModel();

    Pair<List<LookupElement>, Integer> pair;
    synchronized (myList) {
      pair = myPresentableArranger.arrangeItems(this, onExplicitAction || reused);
    }

    List<LookupElement> items = pair.first;
    Integer toSelect = pair.second;
    if (toSelect == null || toSelect < 0 || items.size() > 0 && toSelect >= items.size()) {
      LOG.error(
          "Arranger "
              + myPresentableArranger
              + " returned invalid selection index="
              + toSelect
              + "; items="
              + items);
      toSelect = 0;
    }

    myOffsets.checkMinPrefixLengthChanges(items, this);
    List<LookupElement> oldModel = listModel.toList();

    listModel.removeAll();
    if (!items.isEmpty()) {
      listModel.add(items);
    } else {
      addEmptyItem(listModel);
    }

    updateListHeight(listModel);

    myList.setSelectedIndex(toSelect);
    return !ContainerUtil.equalsIdentity(oldModel, items);
  }