Ticket #22636: meta-boxes.php.diff

meta-boxes.php

@@ -1104 +1104 @@
         $thumbnail_id   = get_post_meta( $post->ID, '_thumbnail_id', true );
         $thumbnail_size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : 'medium';
         $thumbnail_html = wp_get_attachment_image( $thumbnail_id, $thumbnail_size );
+        $thumbnail_html = apply_filters( 'admin_post_thumbnail_meta_box_html', $thumbnail_html, $post->ID );
 
         $classes = empty( $thumbnail_id ) ? '' : 'has-featured-image';