@Override
	public void update( Graphics g, JComponent c ) {
		oldRenderingHints = FlatUIUtils.setRenderingHints( g );

		super.update( g, c );

		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
		oldRenderingHints = null;
	}
The content border insets are used to create a separator between tabs and content.
If client property JTabbedPane.hasFullBorder is true, then the content border insets
are also used for the border.
flatlaf-jide-oss/src/main/java/com/formdev/flatlaf/jideoss/ui/FlatJideTabbedPaneUI.java