paintOutsidePlot method
A second paint pass, running after every series and decoration has painted — e.g. an endpoint badge that must sit above other series, not just above its own. Default: nothing.
This is an ordering hook, not an escape from a clip: paint is already free to draw beyond the plot rectangle. Axis label widgets are painted after this pass and therefore still cover it.
Implementation
void paintOutsidePlot(
ChartPaintContext context,
SeriesRenderSnapshot snapshot,
) {}