Created by: pat270
The active state should also be reflected when using collapse plugin inside nav-pills.
Latest v4-dev branch doesn't work like the current docs site http://v4-alpha.getbootstrap.com/components/navs/#pills-with-dropdowns. I think it was introduced at https://github.com/twbs/bootstrap/commit/91b62941afb7115807fc2925398ebccfc68f5377.
Fixes #23482 (closed).