@Override
		protected ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
			ArrayList<Class<?>> lafClasses = UIDefaultsLoader.getLafClassesForDefaultsLoading( getClass() );
			lafClasses.add( 1, theme.dark ? FlatDarkLaf.class : FlatLightLaf.class );
			lafClasses.add( 2, theme.dark ? FlatDarculaLaf.class : FlatIntelliJLaf.class );
			return lafClasses;
		}
Copy UI default keys (value --> key).
flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java