@Override
	protected void paintVerticalLine( Graphics g, JComponent c, int x, int top, int bottom ) {
		((Graphics2D)g).fill( new Rectangle2D.Float( x, top, UIScale.scale( 1f ), bottom - top ) );
	}
Similar to super.paintRow(), but supports wide selection and uses
inactive selection background/foreground if tree is not focused.
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTreeUI.java