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   2. drupal7

Find the depth limit for items in the parent select.

Code

modules/book/book.module, line 750

<?php
function _book_parent_depth_limit($book_link) {
  return MENU_MAX_DEPTH - 1 - (($book_link['mlid'] && $book_link['has_children']) ? menu_link_children_relative_depth($book_link) : 0);
}
?>