Ticket #22491: 22491.diff

wp-admin/post-new.php

@@ -43 +43 @@
 if ( ! wp_next_scheduled( 'wp_scheduled_auto_draft_delete' ) )
         wp_schedule_event( time(), 'daily', 'wp_scheduled_auto_draft_delete' );
 
-wp_enqueue_script('autosave');
+if ( 'attachment' !== $post_type )
+        wp_enqueue_script('autosave');
 
 // Show post form.
 $post = get_default_post_to_edit( $post_type, true );

wp-admin/post.php

@@ -169 +169 @@
                 add_action('admin_notices', '_admin_notice_post_locked' );
         } else {
                 $active_post_lock = wp_set_post_lock( $post->ID );
-                wp_enqueue_script('autosave');
+
+                if ( 'attachment' !== $post_type )
+                        wp_enqueue_script('autosave');
         }
 
         $title = $post_type_object->labels->edit_item;