anchor.diff:     authorized_data_files = DataFile.authorized_partial_asset_collection(data_files, 'view', current_user)
      authorized_data_file_ids = authorized_data_files.collect(&:id)
      authorized_matching_data_files = @matching_data_files.select { |mdf| authorized_data_file_ids.include?(mdf.primary_key.to_i) }
  -   hidden_items = data_files - authorized_data_files
  -   hidden_count = hidden_items.count
   
      limit ||= 19
      limit_matching_data_files = authorized_matching_data_files[0..limit]
  
positive.code:           -%>
          </li>
      <% end %>
  
      <% unless hidden_count < 1 %>
          <li class="matching_data_item">
             <%= render :partial => "assets/hidden_items", :object => hidden_items -%>
          </li>
      <% end %>
    </ul>
  </div>
negative.code: 
  <div class="show_basic">
    There are totally <span style="font-weight:bold"><%= @matching_data_files.count -%></span> data files matched,
    <span style="font-weight:bold"><%= @matching_data_files.count - authorized_matching_data_files.count %></span> are
    hidden
  
    <%= render :partial => "matching_data_item", :locals => {:matching_data_items => limit_matching_data_files} -%>
  