Loads an icon asynchronously. To finish this function, see g_loadable_icon_load_finish(). For the synchronous, blocking version of this function, see g_loadable_icon_load().
an integer.
optional gio.Cancellable object, NULL to ignore.
a GAsyncReadyCallback to call when the request is satisfied
the data to pass to callback function
Loads an icon asynchronously. To finish this function, see g_loadable_icon_load_finish(). For the synchronous, blocking version of this function, see g_loadable_icon_load().