Plugin: Remove compat layers for WP 6.4 and 6.5

lib/block-supports/layout.php

@@ -1019,27 +1019,10 @@ function gutenberg_restore_group_inner_container( $block_content, $block ) {
 	$processor      = new WP_HTML_Tag_Processor( $block_content );
 
 	if ( $processor->next_tag( array( 'class_name' => 'wp-block-group' ) ) ) {
-		if ( method_exists( $processor, 'class_list' ) ) {
-			foreach ( $processor->class_list() as $class_name ) {
-				if ( str_contains( $class_name, 'layout' ) ) {
-					array_push( $layout_classes, $class_name );
-					$processor->remove_class( $class_name );
-				}
-			}
-		} else {
-			/*
-			* The class_list method was only added in 6.4 so this needs a temporary fallback.
-			* This fallback should be removed when the minimum supported version is 6.4.
-			*/
-			$classes = $processor->get_attribute( 'class' );
-			if ( $classes ) {
-				$classes = explode( ' ', $classes );
-				foreach ( $classes as $class_name ) {
-					if ( str_contains( $class_name, 'is-layout-' ) ) {
-						array_push( $layout_classes, $class_name );
-						$processor->remove_class( $class_name );
-					}
-				}
+		foreach ( $processor->class_list() as $class_name ) {
+			if ( str_contains( $class_name, 'layout' ) ) {
+				array_push( $layout_classes, $class_name );
+				$processor->remove_class( $class_name );
 			}
 		}
 	}

lib/compat/plugin/fonts.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * A special compat layer for legacy font files upload directory.
+ *
+ * @see https://github.com/WordPress/gutenberg/pull/57688#issuecomment-2259037546
+ *
+ * @package gutenberg
+ */
+
+// @core-merge: Do not merge this function, it is for deleting fonts from the wp-content/fonts directory only used in Gutenberg.
+/**
+ * Deletes associated font files from wp-content/fonts, when a font face is deleted.
+ *
+ * @param int     $post_id Post ID.
+ * @param WP_Post $post    Post object.
+ */
+function gutenberg_before_delete_font_face( $post_id, $post ) {
+	if ( 'wp_font_face' !== $post->post_type ) {
+		return;
+	}
+
+	$font_files = get_post_meta( $post_id, '_wp_font_face_file', false );
+
+	if ( empty( $font_files ) ) {
+		return;
+	}
+
+	$site_path = '';
+	if ( is_multisite() && ! ( is_main_network() && is_main_site() ) ) {
+		$site_path = '/sites/' . get_current_blog_id();
+	}
+
+	$font_dir = path_join( WP_CONTENT_DIR, 'fonts' ) . $site_path;
+
+	foreach ( $font_files as $font_file ) {
+		$font_path = $font_dir . '/' . $font_file;
+
+		if ( file_exists( $font_path ) ) {
+			wp_delete_file( $font_path );
+		}
+	}
+}
+add_action( 'before_delete_post', 'gutenberg_before_delete_font_face', 10, 2 );