Font Library: Avoid running init functions when font library is avail…

…able in core. (#58793)

* add a conditional to initialize font library post types and rest routes only if the WP_Font_Library class is not available, for example when the plugin run on WordPress  < 6.5

* remove comment no longer needed  because the font library was already merged into core

* fix conditional

* format php

* update comment text

lib/compat/wordpress-6.5/fonts/fonts.php

@@ -90,7 +90,6 @@ function gutenberg_create_initial_post_types() {
  * @since 6.5
  */
 function gutenberg_create_initial_rest_routes() {
-	// @core-merge: This code will go into Core's `create_initial_rest_routes()`.
 	$font_collections_controller = new WP_REST_Font_Collections_Controller();
 	$font_collections_controller->register_routes();
 }
@@ -101,8 +100,13 @@ function gutenberg_create_initial_rest_routes() {
  * @since 6.5
  */
 function gutenberg_init_font_library() {
-	gutenberg_create_initial_post_types();
-	gutenberg_create_initial_rest_routes();
+	global $wp_version;
+
+	// Runs only if the Font Library is not available in core ( i.e. in core < 6.5-alpha ).
+	if ( version_compare( $wp_version, '6.5-alpha', '<' ) ) {
+		gutenberg_create_initial_post_types();
+		gutenberg_create_initial_rest_routes();
+	}
 }
 
 add_action( 'rest_api_init', 'gutenberg_init_font_library' );