Bug on CategoryStyler generating Area type charts

[MMottaR]

Description
According to the charts offered by the library, when generating one of the Area type, the expected result does not match the one generated.

The issue is reproducible in:
Module Version: xchart.3.8.1
OS Version etc: Ubuntu 20.04.4 LTS

The steps to reproduce are:
Define a new CategoryChart
Set the CategorySeriesRenderStyle as an Area type.

final CategoryChart chart = new CategoryChartBuilder().width(chartWrapper.chartDimensions.get(1))
              .height(chartWrapper.chartDimensions.get(0)).build();
...
chart.getStyler().setPlotGridLinesColor(Color.GRAY);
chart.getStyler().setYAxisDecimalPattern(PATTERN);
chart.getStyler().setDefaultSeriesRenderStyle(CategorySeries.CategorySeriesRenderStyle.Area);

The expected result is:

Show a chart with the area below the boundary colored
The actual results is:

It does not generate any error other than the visible one, a solution found is presented in the Plot_Category class as indicated by the attached .txt
xchart_3_8_1.txt

I've searched for any related issues and avoided creating a duplicate issue, thanks.

[mccartney]

Instead of attaching a patch file, I suggest you create a Pull Request toward the repository.

[timmolter]

i fixed this in a different way