twitter/bootstrap — pull request #4994 by BellendSebastian (2012-09-05 16:12:18+00:00)
Title: Enable multiple lists to be updated by scrollspy

Changed scrollspy's behaviour to not remove all possible active classes and only remove the relevant list's active state, allowing for multiple lists in a single page.

Example:
http://codepen.io/BellendSebastian/pen/cfkDF