Fixed #17515 -- Added ability to override the template of custom admin FilterSpec classes. Thanks, saxix and Julien Phalip.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17483 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_views/models.py

@@ -105,6 +105,10 @@ class Color(models.Model):
     def __unicode__(self):
         return self.value
 
+# we replicate Color to register with another ModelAdmin
+class Color2(Color):
+    class Meta:
+        proxy = True
 
 class Thing(models.Model):
     title = models.CharField(max_length=20)