jzaefferer/jquery-validation — pull request #873 by patheard (2013-08-27 15:15:36+00:00)
Title: Fix require_from_group and skip_or_fill_minimum

Stops the require_from_group and skip_or_fill_minimum validation
methods from clearing previous validation rules on a form.

It does this by creating a cloned copy of the form's validator for
each group of conditionally required fields. This validator is then
used to validate the field group and is stored for re-use (fixes #412).