Active menu item for Variations

When a user is forwarded to a A/B/N Variation they can still click any links in a menu to the original and be consistently forwarded to the same variation which is great. The problem is Drupal doesn't know what the variation should still have the same active menu or menu trail.

This can be as little as a top level menu item like "Home" not being styled as as selected because it's missing it's .active class - to - a whole sub menu not appearing.

I might be able to do some development resources towards fixing this but first wanted to find out how other people are dealing with the problem or any suggestions on how a solution could work.