Finishes the async construction for the various g_async_initable_new calls, returning the created object or NULL on error. Since 2.22
the GAsyncResult from the callback
a newly created GObject, or NULL on error. Free with g_object_unref(). [type GObject.Object][transfer full]
GException on failure.
See Implementation
Finishes the async construction for the various g_async_initable_new calls, returning the created object or NULL on error. Since 2.22