twbs/bootstrap — pull request #9453 by jharbert (2013-08-14 02:44:04+00:00)
Title: Navbar Collapse Issue - dropdown-menu hidden on navbar uncollapse

Small fix to set the overflow-y to visible when navbar is uncollapsed. Otherwise, if you collapse a navbar, click a dropdown, then uncollapse the menu, the dropdown-menu is hidden inside of the navbar.

You can see this issue by replicating the steps steps described above here: http://getbootstrap.com/components/#navbar