private static String toString( Border b, boolean classHierarchy ) {
		if( b == null )
			return "null";

		String s = toString( b.getClass(), classHierarchy );

		if( b instanceof EmptyBorder ) {
			String borderInsets = " (" + toString( ((EmptyBorder)b).getBorderInsets() ) + ')';
			int brIndex = s.indexOf( "<br>" );
			if( brIndex >= 0 )
				s = s.substring( 0, brIndex ) + borderInsets + s.substring( brIndex );
			else
				s += borderInsets;
		}

		return s;
	}
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