Best to just run the attached demo. Coordinates are computed from the upper left corner of the whole JFreeChart panel/frame, instead of the particular chart. So when you, in the attached demo, hover on the left side of the first bin, events are actually fired for the first bin when they should not. Best to run the demo and just mouse-hovering over bins. It's very visible.
It's a regression, in 1.0.13 it works. In /branches/jfreechart-1.0.x-branch it doesn't.
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