XYSeries.hovered() doesn't behave as documented

According to the documentation for the 'hovered(point point, bool state)' signal for XYSeries, "This signal is emitted when a mouse is hovered over the point point in the chart. When the mouse moves over the point, state turns true, and when the mouse moves away again, it turns false."

This does not seem to behave as documented. If two points (or their respective targets for the hovered() signal) overlap, the signal is only emitted when hovering over the first point, but no signals are emitted when moving from the first to the second point - according to the documentation we should receive two signals (one for leaving the first point and one for entering the second point). The signal with state == false is only emitted once both points are left.

This behavior makes it impossible to use the signal to present a data tool tip for densely populated data (e.g., a series of more or less continuous points).