commit a566b0ee5db11e242fff5a433b71f214cf8054af
Author: Oskar Schöldström <public@oxy.fi>
Date:   Sat Sep 1 17:00:05 2012 +0300

    Issue 675446-108

diff --git a/core/misc/autocomplete.js b/core/misc/autocomplete.js
index f0e3323..51de595 100644
--- a/core/misc/autocomplete.js
+++ b/core/misc/autocomplete.js
@@ -13,14 +13,7 @@ var autocomplete;
  */
 function autocompleteSplitValues(value) {
   // We will match the value against comma-seperated, quoted terms.
-  var arr = value.match(/("[^"]+")|(\b\w+\b)/g);
-  // The toSource function, when available, will return an array of split terms.
-  if (typeof arr.toSource == "function") {
-    return arr.toSource();
-  }
-  else {
-    return arr;
-  }
+  return value.match(/("[^"]+")|(\b\w+\b)/g) || [];
 }
 
 
@@ -64,8 +57,6 @@ function sourceData(request, response) {
    * @param {Object} data
    */
   function sourceCallbackHandler(data) {
-    autocomplete.cache[term] = data;
-
     // Drupal returns an object, we need an array.
     var terms = [];
     for (var i in data) {
@@ -73,6 +64,8 @@ function sourceData(request, response) {
         terms.push(data[i]);
       }
     }
+    autocomplete.cache[term] = terms;
+
     // Send the new string array of terms to the jQuery UI list.
     response(terms);
   }
@@ -131,20 +124,15 @@ Drupal.behaviors.autocomplete = {
     // Act on textfields with the "form-autocomplete" class.
     var $autocomplete = $(context).find('input.form-autocomplete').once('autocomplete');
     if ($autocomplete.length) {
-      $autocomplete.each(function () {
-        // Use jQuery UI Autocomplete on the textfield.
-        $(this).autocomplete(autocomplete.options);
-      });
+      // Use jQuery UI Autocomplete on the textfield.
+      $autocomplete.autocomplete(autocomplete.options);
     }
   },
   detach: function (context, settings, trigger) {
     if (trigger === 'unload') {
-      var $autocomplete = $(context).find('input.form-autocomplete').removeOnce('autocomplete');
-      if ($autocomplete.length) {
-        $autocomplete.each(function () {
-          $(this).autocomplete('destroy');
-        });
-      }
+      $(context).find('input.form-autocomplete')
+        .removeOnce('autocomplete')
+        .autocomplete('destroy');
     }
   }
 };