a #GAsyncResult
a #gboolean, returns whether the loaded icon was a symbolic one and whether the @fg color was applied to it.
Return: the rendered icon; this may be a newly created icon or a new reference to an internal icon, so you must not modify the icon. Use g_object_unref() to release your reference to the icon.
GException on failure.
3.8
Finishes an async icon load, see gtk_icon_info_load_symbolic_for_context_async().