This filter is documented in wp-admin/includes/nav-menu.php
wp_edit_nav_menu_walker
Filters the Walker class used when adding nav menu items.
do_meta_boxes
This action is documented in wp-admin/includes/meta-boxes.php
add_meta_boxes
Fires after all built-in meta boxes have been added.
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Walker_Nav_Menu
Core class used to implement an HTML list of nav menu items.
revoke_super_admin
Revokes Super Admin privileges.
grant_super_admin
Grants Super Admin privileges.
is_super_admin
Determine if user is a site admin.
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get_super_admins
Retrieve a list of super admins.
current_user_can_for_blog
Whether the current user has a specific capability for a given site.
get_the_author_link
Retrieve either author’s link or author’s name.
_add_themes_utility_last
Adds the (theme) ‘Editor’ link to the bottom of the Appearance menu.
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install_global_terms
Install global terms.
upgrade_network
Executes network-level upgrade routines.
convert_to_screen
Convert a screen string to a screen object