twitter/bootstrap — pull request #7067 by JelteF (2013-02-26 01:34:04+00:00)
Title: Position of the page doesn't change anymore when switching from a short to a long page

When switching from a page without a scrollbar to a page with one or vice versa, the centre of the page changes. This causes a slight move to left or right. This easy fix makes sure a vertical scrollbar is always visible, even when it's not needed. This way no centre change happens and the page doesn't move slightly.