Fix composite object implementation to also map properties for the initial properties passed to the factory

src/create-composite-object.js

@@ -17,6 +17,7 @@ function getPosition(object) {
 
 module.exports = function createCompositeObject(options) {
 	let mapProperties = createPropertyMapper(options.propertyMap);
+	let initialPropertySet = mapProperties(options);
 
 	let compositeObject = createObject(Object.assign({
 		onSet: function setCompositeProperties(properties) {
@@ -77,7 +78,7 @@ module.exports = function createCompositeObject(options) {
 				offsetY: y1
 			}
 		}
-	}, options));
+	}, initialPropertySet._));
 
 	Object.keys(compositeObject.objects).forEach((objectName) => {
 		compositeObject.objects[objectName].on("recalculatedSize", () => {
@@ -89,5 +90,6 @@ module.exports = function createCompositeObject(options) {
 		});
 	});
 
+	compositeObject.set(options);
 	return compositeObject;
 };