private void repaintAreaBelowTable() {
			Container viewport = SwingUtilities.getUnwrappedParent( table );
			if( viewport instanceof JViewport ) {
				int viewportHeight = viewport.getHeight();
				int tableHeight = table.getHeight();
				if( tableHeight < viewportHeight )
					HiDPIUtils.repaint( viewport, 0, tableHeight, viewport.getWidth(), viewportHeight - tableHeight );
			}
		}
Used if table auto-resize-mode is off to repaint outside alternate rows
when table width changed (column resized) or component orientation changed.
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableUI.java