This patch fixed the a part of the bug [ 2392215 ] Foregroundalpha webfilled. For the spider web chart the Webfilled setting can now display some spider filled and other not filled.
Using the same logic as setSeriesPaint(0, Color.green) the setWebFilled(0) sets the first series to be filled.
By default if this method is not called all webs will be filled.
The first part of the bug cannot be replicated. I am able to set the foregroundalpha with the setter available.