Block Editor: Show privacy help notice on Privacy Policy page.

When editing a page set to be the Privacy Policy page, display a help notice
containing a link to the Privacy Policy guide.

This changeset ports this functionality to the new Block Editor.

Props desrosj.
Fixes #45057.



git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43920 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/admin-filters.php

@@ -144,7 +144,7 @@
 add_action( 'admin_init', array( 'WP_Privacy_Policy_Content', 'text_change_check' ), 100 );
 
 // Show a "postbox" with the text suggestions for a privacy policy.
-add_action( 'edit_form_after_title', array( 'WP_Privacy_Policy_Content', 'notice' ) );
+add_action( 'admin_notices', array( 'WP_Privacy_Policy_Content', 'notice' ) );
 
 // Add the suggested policy text from WordPress.
 add_action( 'admin_init', array( 'WP_Privacy_Policy_Content', 'add_suggested_content' ), 1 );

src/wp-admin/includes/misc.php

@@ -1540,10 +1540,13 @@ public static function get_suggested_policy_text() {
 	 * Add a notice with a link to the guide when editing the privacy policy page.
 	 *
 	 * @since 4.9.6
+	 * @since 5.0.0 The $post parameter is now optional.
 	 *
-	 * @param WP_Post $post The currently edited post.
+	 * @param WP_Post|null $post The currently edited post. Default null.
 	 */
-	public static function notice( $post ) {
+	public static function notice( $post = null ) {
+		$post = get_post( $post );
+
 		if ( ! ( $post instanceof WP_Post ) ) {
 			return;
 		}