twitter/bootstrap — pull request #5082 by smcguinness (2012-09-11 16:29:39+00:00)
Title: Update less/dropdowns.less

Adding font-size to .dropdown-menu to account for .input-append setting font-size to 0.

This issue is run into when a search form has .input-append for an appended button and the button is of dropdown type. The font-size 0 causes the drop down options to inherit that property.