[bisq-network/bisq] UI: In OfferBook, show tooltip on data point hover (#4228)

[Petr Hejna]

@petrhejna commented on this pull request.



>          areaChart.getData().addAll(List.of(seriesBuy, seriesSell));
     }
 
+    /**
+     * A node which displays a label on hover, but is otherwise empty
+     *
+     * Based on https://gist.github.com/jewelsea/1422628
+     */
+    protected class HoveredLabelNode extends StackPane {

I would move this Node to the separate file and pass data via constructor (the price ->`xAxis.getTickLabelFormatter().toString(price)`. 

This file is quite long already and this is separable responsibility.

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