Conflict with Contemplate - incorrect trail is set

when editing templates for a content type in Contemplate,
the menu trail is set based on the node used by Contemplate for variable example.

i.e. if node #27 is used as the example of available variables in Contemplate,
the menu trail is set to the same as viewing page node/27.

the below code add a simple detection for Contemplate in hook_nodeapi to solve the issue:

function menutrails_nodeapi(&$node, $op, $a3 = NULL, $page = FALSE) {
  if ($op == 'view' && $page == TRUE) {
    $menu_item = menu_get_item();
    if ($menu_item['page_callback'] == 'contemplate_edit_type') {
      return;
    }
    $item = menutrails_node_location($node);
    if ($item) {
      menu_set_item(NULL, $item);
      if (variable_get('menutrails_breadcrumbs', 1)) {
        drupal_set_breadcrumb(menutrails_get_breadcrumbs());
      }
    }
  }
}