docs: public void updateTreeContent(List<CmsGalleryTreeEntry> galleryTreeEntries, List<String> selectedGalleries) {
  
          clearList();
          m_selectedGalleries = selectedGalleries;
          if (!galleryTreeEntries.isEmpty()) {
              m_itemIterator = new TreeItemGenerator(galleryTreeEntries);
              loadMoreItems();
          } else {
              showIsEmptyLabel();
          }
          onContentChange();
      }