Add a hook for adding new menu settings

[stewarty]

I would like to add a setting to a menu (alongside the Theme locations or Auto add pages settings). A hook in nav-menu.php would allow for the addition of settings here.

The 'wp_update_nav_menu' hook already exists in wp-admin/includes/nav-menu.php for processing the incoming data (see how 'auto-add-pages' is processed.

Worth starting simply as a single hook and then filter by menu_id as well?

[DrewAPicture]

Duplicate of #18584.

[briandichiara]

I think this might actually be a duplicate of #19464