twbs/bootstrap — pull request #14092 by JelteF (2014-07-08 21:52:23+00:00)
Title: Remove transitions from button when using it as a form-control

This [stack overflow post](http://stackoverflow.com/a/19777742/2570866) suggests that the `form-control` class should be used if you want a full-width button in your form. This sounds reasonable, but because of the focus glow in normal `.form-control` elements it pressing of the button gets an added transition.
This pull request disables that transition.