Site Editor: preload settings requests

lib/compat/wordpress-6.8/preload.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Preload necessary resources for the editors.
+ *
+ * @param array                   $paths   REST API paths to preload.
+ * @param WP_Block_Editor_Context $context Current block editor context
+ *
+ * @return array Filtered preload paths.
+ */
+function gutenberg_block_editor_preload_paths_6_8( $paths, $context ) {
+	if ( 'core/edit-site' === $context->name ) {
+		$paths[] = '/wp/v2/settings';
+		$paths[] = array( '/wp/v2/settings', 'OPTIONS' );
+		// Append a pseudo context value to allow preloading twice. `canUser`
+		// uses the same path. Ideally the raw result is cached and used by both
+		// `canUser` and `loadSiteEntity`.
+		$paths[] = array( '/wp/v2/settings?context=schema', 'OPTIONS' );
+	}
+	return $paths;
+}
+add_filter( 'block_editor_rest_api_preload_paths', 'gutenberg_block_editor_preload_paths_6_8', 10, 2 );

lib/load.php

@@ -116,6 +116,9 @@ function gutenberg_is_experiment_enabled( $name ) {
 require __DIR__ . '/compat/wordpress-6.7/compat.php';
 require __DIR__ . '/compat/wordpress-6.7/post-formats.php';
 
+// WordPress 6.8 compat.
+require __DIR__ . '/compat/wordpress-6.8/preload.php';
+
 // Experimental features.
 require __DIR__ . '/experimental/block-editor-settings-mobile.php';
 require __DIR__ . '/experimental/blocks.php';

packages/core-data/src/entities.js

@@ -418,7 +418,10 @@ async function loadSiteEntity() {
 	};
 
 	const site = await apiFetch( {
-		path: entity.baseURL,
+		// Append a pseudo context value to allow preloading twice. `canUser`
+		// uses the same path. Ideally the raw result is cached and used by both
+		// `canUser` and `loadSiteEntity`.
+		path: entity.baseURL + '?context=schema',
 		method: 'OPTIONS',
 	} );