Rebuild "reorder" option

[PL-Antony]

1. I think, if developer use "reorder" options in nested modules with slugs, function should save a slug-path after change position -> then it make a sence [FUTURE]

2. If - for example - i delete a items in depth 2, (About Us (root depth) -> What (depth 1) My Picture (depth 2) page does't auto-refersh state and other saved depth dissapear and i can see only root depth. After manually-refresh page i can see saved depth

#675