Propagates an error from within the simple asynchronous result to
a given destination.
If the GCancellable given to a prior call to
g_simple_async_result_set_check_cancellable() is cancelled then this
function will return TRUE with dest set appropriately.
Propagates an error from within the simple asynchronous result to a given destination. If the GCancellable given to a prior call to g_simple_async_result_set_check_cancellable() is cancelled then this function will return TRUE with dest set appropriately.