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Calling `setData` on a chart with `xAxis.type = category` strips dataLabels from chart #5768
The category labels are removed and replaced with the index of the series.
Live demo with steps to reproduce
Click the button, the dataLabels will change to the index of the point rather than the name of the point.
This broke in 4.2.7, Highcharts 4.2.6 behavior here: http://jsfiddle.net/fu6xabxw/1/