Fixed #11404. Added `FormSet.has_changed, for consistancy with Form.has_changed`. Thanks to michelts for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16773 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/formsets.py

@@ -300,6 +300,12 @@ class BaseFormSet(StrAndUnicode):
         """
         pass
 
+    def has_changed(self):
+        """
+        Returns true if data in any form differs from initial.
+        """
+        return any(form.has_changed() for form in self)
+
     def add_fields(self, form, index):
         """A hook for adding extra fields on to each form instance."""
         if self.can_order: