highslide-software/highcharts.com — pull request #956 by sranck (2012-05-11 18:32:43+00:00)
Title: Fix for issue #68

Fix for issue #68 - it checks to see if chart.hoverSeries.isCartesian before hiding the tooltip when the mouse is outside of the plot area. This allows tooltips to work on pie charts that are outside of the plot area.