The IPlotterRegion.clear() method is not implemented in PlotterRegion. Once the state of the region is torn down in that method, it should be possible to then add another plot which is then plotted properly. This should have a proper test case.
The InteractivePlotterRegionTest calls show() and clear() and then adds a new plot. It seems to work fine. The plotter's methods for clearing should also be checked. Closing as fixed.
The IPlotterRegion.clear() method is not implemented in PlotterRegion. Once the state of the region is torn down in that method, it should be possible to then add another plot which is then plotted properly. This should have a proper test case.