twitter/bootstrap — pull request #7375 by thomas-mcdonald (2013-03-23 19:26:38+00:00)
Title: Fix horizontal-three-colors to a horizontal filter gradient

While playing with a preview Sass conversion of 3 I noticed that both horizontal-three-colors and vertical-three-colors had the same filter type. This fixes horizontal-three-colors so that a horizontal gradient is rendered in IE9 and below.