twbs/bootstrap — pull request #13851 by ahoereth (2014-06-18 17:08:40+00:00)
Title: Add white-space: nowrap; to .dropdown-header

Dropdowns adjust their width to the width of their containing a elements - which have no line breaks [[*](https://github.com/twbs/bootstrap/commit/f226463b057f945795661c3d19fbcabf63b931f7)]. Consistent to this dropdown-headers also should be prevent to contain line breaks.