private void highlight( Component c ) {
		if( highlightFigure == null ) {
			highlightFigure = createHighlightFigure();
			rootPane.getLayeredPane().add( highlightFigure, HIGHLIGHT_LAYER );
		}

		highlightFigure.setVisible( c != null );

		if( c != null ) {
			Insets insets = rootPane.getInsets();
			highlightFigure.setBounds( new Rectangle(
				SwingUtilities.convertPoint( c, -insets.left, -insets.top, rootPane ),
				c.getSize() ) );
		}
	}
Installs a key listener into the application that allows enabling and disabling
the UI inspector with the given keystroke (e.g. "ctrl shift alt X").

@param activationKeys a keystroke (e.g. "ctrl shift alt X"), or {@code null} to use "ctrl shift alt X"
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatInspector.java