- Patch #1415828 by BJ___, patrickd, nod_, damiankloip: made Tabledrag a library.

core/includes/common.inc

@@ -4901,8 +4901,7 @@ function drupal_add_tabledrag($table_id, $action, $relationship, $group, $subgro
     // Add the table drag JavaScript to the page before the module JavaScript
     // to ensure that table drag behaviors are registered before any module
     // uses it.
-    drupal_add_library('system', 'jquery.cookie');
-    drupal_add_js('core/misc/tabledrag.js', array('weight' => -1));
+    drupal_add_library('system', 'drupal.tabledrag');
     $js_added = TRUE;
   }
 

core/modules/system/system.module

@@ -1218,6 +1218,18 @@ function system_library_info() {
     ),
   );
 
+  // Drupal's tabledrag library.
+  $libraries['drupal.tabledrag'] = array(
+    'title' => 'Drupal tabledrag',
+    'version' => VERSION,
+    'js' => array(
+      'core/misc/tabledrag.js' => array('group' => JS_LIBRARY, 'weight' => -1),
+    ),
+    'dependencies' => array(
+      array('system', 'jquery.cookie'),
+    ),
+  );
+
   // Drupal's collapsible fieldset.
   $libraries['drupal.collapse'] = array(
     'title' => 'Drupal collapsible fieldset',