private static int getExpandableHintIndex(@NotNull JComponent component) {
    if (component instanceof ComponentWithExpandableItems<?> c) {
      Collection<?> items = c.getExpandableItemsHandler().getExpandedItems();
      Object item = items.isEmpty() ? null : items.iterator().next();
      if (item instanceof Integer) return (Integer)item;
    }
    return -1;
  }
private static int getExpandableHintIndex(@NotNull JComponent component)