NickQiZhu/dc.js — pull request #322 by sclevine (2013-10-08 17:07:24+00:00)
Title: Fix graphical glitches in charts due to stale data

This should fix issue #296. We clear dataLayers in the GroupStack object each time we fill the chart with data from the crossfilter group. Using the `GroupStack::clear` method will also clear the GroupStack groups, which breaks stacks (which obviously isn't desirable, and causes many test failures).