HBox does not show all ChartViewer instances

[briemla]

Wrapping several ChartViewer instances directly in a HBox shows only some of them. The ChartViewer instances are too big. Taking a look with ScenicView at the UI reveals, that each viewer instance uses n times the size which should be needed. When the ChartViewer gets wrapped into a StackPane, it works like expected.

The code at gist.github.com shows the effect and also a possible workaround. Use numberOfCharts and showBug to change the number of visible charts and to activate the workaround. The used chart and the data are taken from the BarChartFXDemo1.

[briemla]

This looks like a duplicate of #3