@Override
		public Graphics create() {
			return new RoundedSelectionGraphics( super.create(), alternateRowColor );
		}
Because selection painting is done in the cell renderer, it would be
necessary to require a FlatLaf specific renderer to implement rounded selection.
Using a LaF specific renderer was avoided because often a custom renderer is
already used in applications. Then either the rounded selection is not used,
or the application has to be changed to extend a FlatLaf renderer.
<p>
To solve this, a graphics proxy is used that paints rounded selection
if row/column/cell is selected and the renderer wants to fill the background.
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableUI.java