docs: public List<Item> getSelectedItems() {
  
          Collection<?> ids = (Collection<?>)m_fileTable.getValue();
          List<Item> items = new ArrayList<>();
          for (Object id : ids) {
              if (m_container.containsId(id)) {
                  items.add(m_container.getItem(id));
              }
          }
          return items;
      }