[1.0.X] Fixed #9341: add another on ManyToManyFields with `raw_id_a…

…dmins` now works correctly. Backport of r10452 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10453 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/media/js/admin/RelatedObjectLookups.js

@@ -79,7 +79,11 @@ function dismissAddAnotherPopup(win, newId, newRepr) {
             elem.options[elem.options.length] = o;
             o.selected = true;
         } else if (elem.nodeName == 'INPUT') {
-            elem.value = newId;
+            if (elem.className.indexOf('vManyToManyRawIdAdminField') != -1 && elem.value) {
+                elem.value += ',' + newId;
+            } else {
+                elem.value = newId;
+            }
         }
     } else {
         var toId = name + "_to";