Request information for a number of files from the enumerator asynchronously.
When all i/o for the operation is finished the
callback will be called with
the requested information.
gFileEnumeratorNextFilesAsync(object, num.files, io.priority = 0, cancellable = NULL, callback, user.data = NULL)
The callback can be called with less than
num.files files in case of error
or at the end of the enumerator. In case of a partial error the callback will
be called with any succeeding items and no error, and on the next request the
error will be reported. If a request is cancelled the callback will be called
During an async request no other sync and async calls are allowed, and will
Any outstanding i/o request with higher priority (lower numerical value) will
be executed before an outstanding request with lower priority. Default