ivaynberg/select2 — pull request #300 by egeste (2012-08-06 18:59:35+00:00)
Title: Round the css top and left values for the dropdown

In Chrome 21.0.1180.57, the dropdown appears one pixel too low or offset left/right from the container if the result of this.container.offset() produces offsets that are not whole numbers.
This fix rounds the css top attribute down to a whole number.
This fix also rounds the left attribute to the nearest whole number.