ivaynberg/select2 — pull request #1891 by jfisheratwork (2013-11-07 21:29:13+00:00)
Title: Fix for collision detection regarding enoughRoomOnRight and css border top for drop-auto-width

- collision detection was not moving the drop left based on the
difference between viewport and relative location of box (dropleft +
dropwidth)
- .select2-drop-active was overriding the .select2-drop-auto-width
making the shifted dropbox look a bit wierd