public InputStream getDefaults( Class<?> lafClass ) {
		Class<?> addonClass = this.getClass();
		String propertiesName = '/' + addonClass.getPackage().getName().replace( '.', '/' )
			+ '/' + UIDefaultsLoader.simpleClassName( lafClass ) + ".properties";
		return addonClass.getResourceAsStream( propertiesName );
	}
Finds an addon .properties file for the given LaF class and returns
it as input stream. Or {@code null} if not found.
<p>
This default implementation finds addon .properties file for the given LaF class
in the same package as the subclass.
<p>
Override this method to load addon .properties files from other locations.
flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDefaultsAddon.java