twitter/bootstrap — pull request #5205 by code0100fun (2012-09-20 05:19:10+00:00)
Title: Fixed nav menu bug in IE7 and IE8 caused by fe3ed43

Fixed bug in v2.1.1 Navbar. Menu is hidden in IE8 and IE7.

This was caused by removing
`overflow: visible \9;`
for the collapse class from less/component-animations.less in commit fe3ed43

The commit(fe3ed43) removed a nasty hack for IE7 and IE8 that broke collapsables, but had an unintended side effect on navbar menus.