zurb/foundation — pull request #4617 by alandaguegreene (2014-03-07 00:49:45+00:00)
Title: Limit legacy visibility classes to legacy breakpoints

When enabled, generating legacy visibility classes only uses small, medium, and large breakpoints. Since those were the only breakpoints that existed in Foundation 4, there is no need to generate visibility classes for any breakpoints beyond those three.

This addresses what I believe was an incomplete merge of #4345, where an older version of _visibility.scss was used.