Ticket #10729: 10729.patch

wp-admin/post.php

@@ -147 +147 @@
                 $last_user_name = $last_user ? $last_user->display_name : __('Somebody');
                 $message = sprintf( __( 'Warning: %s is currently editing this post' ), esc_html( $last_user_name ) );
                 $message = str_replace( "'", "\'", "<div class='error'><p>$message</p></div>" );
-                add_action('admin_notices', create_function( '', "echo '$message';" ) );
+                add_action('admin_notices', create_function( "\$html = '$message'", 'echo $html;' ) );
         } else {
                 wp_set_post_lock( $post->ID );
                 wp_enqueue_script('autosave');