default Insets getClientPropertyInsets( Object key, String defaultValueKey ) {
		Object value = getClientProperty( key );
		return (value instanceof Insets) ? (Insets) value : UIManager.getInsets( defaultValueKey );
	}
Overrides {@link JComponent#putClientProperty(Object, Object)}.
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatComponentExtension.java