[1.1.X] Fixed #12879: Declaring the same JS file multiple times in a single Media instance now only includes that file once. Backport of [12663] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12664 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 3 insertions, 1 deletions

diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 36018979b8..ffab039829 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -80,7 +80,9 @@ class Media(StrAndUnicode):
 
     def add_js(self, data):
         if data:
-            self._js.extend([path for path in data if path not in self._js])
+            for path in data:
+                if path not in self._js:
+                    self._js.append(path)
 
     def add_css(self, data):
         if data: