multifield_field_widget_form should call hook_field_attach_fields

+++ b/multifield.field.inc
@@ -421,12 +420,40 @@ function multifield_field_widget_form(&$form, &$form_state, $field, $instance, $
+  //$form['#bundle'] = $bundle;

When I create a field group on a multifield, it stores the bundle and entity name that the fieldgroups are assigned to, in this case is the machine name of the multifield and 'multifield'.

So, in order to get field groups to load up the proper field group information, we'll have to uncomment this $bundle line.

But since we're passing in the $element by reference to _multifield_field_attach_form(), that would change it in the calling function, and we still want the bundle in that context to reflect the bundle that the multifield is attached to. So I still think we need to stash the bundle, change it to the multifield machine name, call hook_field_attach_form, and then restore it.