Scaffold out preloading

lib/compat/wordpress-6.3/navigation-block-preloading.php

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Adds the preload paths registered in Core (`edit-form-blocks.php`).
+ *
+ * @param array                   $preload_paths    Preload paths to be filtered.
+ * @param WP_Block_Editor_Context $context The current block editor context.
+ * @return array
+ */
+function gutenberg_preload_navigation_permissions( $preload_paths, $context ) {
+
+    $preload_paths[] = array( rest_get_route_for_post_type_items( 'wp_navigation' ), 'OPTIONS' );
+
+	$preload_paths[] = rest_get_route_for_post_type_items( 'wp_navigation' );
+	// add /wp/v2/navigation?context=edit&per_page=-1&status%5B0%5D=publish&status%5B1%5D=draft to preload paths array
+	$preload_paths[] = array(
+		rest_get_route_for_post_type_items(
+			'wp_navigation',
+		),
+		array(
+			'context'  => 'edit',
+			'per_page' => '-1',
+			'status'   => array( 'publish, draft' ),
+		),
+
+	);
+
+	// add /wp/v2/navigation?_locale=user&context=edit&per_page=100&status%5B0%5D=publish&status%5B1%5D=draft to preload paths array
+	$preload_paths[] = array(
+		rest_get_route_for_post_type_items(
+			'wp_navigation',
+		),
+		array(
+			'_locale'  => 'user',
+			'context'  => 'edit',
+			'per_page' => '100',
+			'status'   => array( 'publish, draft' ),
+		),
+
+	);
+
+	echo '<pre>';
+	var_dump( $preload_paths );
+	echo '</pre>';
+
+	return $preload_paths;
+}
+add_filter( 'block_editor_rest_api_preload_paths', 'gutenberg_preload_navigation_permissions', 10, 2 );

lib/load.php

@@ -52,6 +52,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 	require_once __DIR__ . '/compat/wordpress-6.3/class-gutenberg-rest-pattern-directory-controller-6-3.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/class-gutenberg-rest-templates-controller-6-3.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/rest-api.php';
+	require_once __DIR__ . '/compat/wordpress-6.3/navigation-block-preloading.php';
 
 	// Experimental.
 	if ( ! class_exists( 'WP_Rest_Customizer_Nonces' ) ) {