I noticed that the first XYItemEntity is never recognized when i move the mouse over (or click on) the first item. It happens only for the first item of the series and only on Step chart .
never equal Item 0
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The bug report contains very little information. I checked a simple XYPlot with a XYStepRenderer and there seem to be no problems. Tooltips work for the first, the last and the datapoints in between.
If you still feel this is a bug, please reopen and provide more information or a working demo that shows the problem.