Ticket #37916: 37916.2.diff

src/wp-includes/class-wp-customize-nav-menus.php

@@ -764 +764 @@
                         wp_send_json_error( 'missing_params', 400 );
                 }
 
+                if ( ! apply_filters( 'customize_create_nav_menu_content', true ) ) {
+                        wp_send_json_error( 'nav_menu_creation_disabled', 400 );
+                }
+
                 $params = wp_array_slice_assoc(
                         array_merge(
                                 array(
@@ -941 +945 @@
                                         <div class="accordion-section-content">
                                                 <?php if ( 'post_type' === $available_item_type['type'] ) : ?>
                                                         <?php $post_type_obj = get_post_type_object( $available_item_type['object'] ); ?>
-                                                        <?php if ( current_user_can( $post_type_obj->cap->create_posts ) && current_user_can( $post_type_obj->cap->publish_posts ) ) : ?>
+                                                        <?php if ( current_user_can( $post_type_obj->cap->create_posts ) && current_user_can( $post_type_obj->cap->publish_posts ) && apply_filters( 'customize_create_nav_menu_content', true ) ) : ?>
                                                                 <div class="new-content-item">
                                                                         <input type="text" class="create-item-input" placeholder="<?php echo esc_attr( $post_type_obj->labels->add_new_item ); ?>">
                                                                         <button type="button" class="button add-content"><?php _e( 'Add' ); ?></button>