anchor.diff:            <%= datetime_format(subfolder.updated_at) %>
           </td>
   
  +        <% if (can? :manage, Material) && not(subfolder.is_virtual) %>
           <td>
  -          <% if (can? :manage, Material) && not(subfolder.is_virtual) %>
               <%= link_to course_edit_material_folder_path(@course, subfolder), class: 'btn' do %>
                 <i class="icon-edit"></i>
               <% end %>
  
positive.code:               class: 'btn btn-danger' do %>
                  <i class="icon-trash"></i>
              <% end %>
            <% else %>
              &nbsp;
            <% end %>
          </td>
  
        </tr>
      <% end %>
  
negative.code:           <%= datetime_format(material.updated_at) %>
          </td>
  
          <% if (can? :manage, Material) && not(material.is_virtual) %>
          <td>
              <%= link_to edit_course_material_path(@course, material), class: 'btn' do %>
                <i class="icon-edit"></i>
              <% end %>
  