Node count not correct when moving node in hierarchy from A to B (count of A is not updated).

in the "taxonomy_menu_node_presave($node)" function, the terms_old variable is not properly set. it should be the previous term set in the node, but actually, it's the new one, just because the $node var in the function is allready the new node.

A good way to fix it, it's just to load again the node from the database, with a simple node_load(). So the function could be :

/**
 * Implementation of hook_node_presave().
 */
function taxonomy_menu_node_presave($node) {
  $terms_old = &drupal_static('taxonomy_menu_terms_old');
  //get the terms from the database before the changes are made.
  //these will be used to update the menu item's name if needed
  //we go directly to the db to bypass any caches
  $node_old = node_load($node->nid);
  $terms_old = _taxonomy_menu_get_node_terms($node_old);
}

Fix this function will fix menu not disappear in the menu_taxonomy tree after node update. If the term has no node, it actually stays in the menu, resulting of an empty taxonomy page (issue http://drupal.org/node/1403332).