Added new Point property, dataGroup, that holds information of what raw data points are included in a grouped point.
5 BUGFIXESEXPANDCOLLAPSE
Fixed #3477, range selector did not update axis extremes after pressing enter in IE.
Fixed #4747, gapSize did not apply to each series independently.
Fixed #5041, scroller.zoomedMin was bigger than zoomedMax, which caused error due to negative width.
Fixed #5165, space was reserved for the exporting button even when disabled.
Fixed #5172, scroller threw error with empty series data and an X axis minimum setting.
HIGHCHARTS CORE v4.2.4 CHANGES
These core changes also apply to this moduleEXPANDCOLLAPSE
Added support for polar columnrange series.
Added e.originalEvent to drilldown event in order to catch modifier keys and other properties. Closes #5113.
Added new drilldown event, chart.events.drillupall, that is triggered after multiple single drillup events. Closes #5158. Closes #5159.
Added new option, chart.options3d.fitToPlot to fit 3D charts into the available plotting area. This may affect the layout of existing 3D charts if the layout was adjusted by chart.margin. The chart.margin setting can now normally be removed. Closes #4933.
Added new option, lang.shortWeekdays, to specify short weekdays other than the first three letters of the weekday.