Asynchronously copies a file and returns a [class@Dex.
Future] which can be observed for the result.
| source |
a [iface@Gio.File] |
| destination |
a [iface@Gio.File] |
| flags |
a set of [flags@Gio.FileCopyFlags] |
| io_priority |
the IO priority of the request |
|
a [class@Dex.Future] that resolves to true if successful otherwise rejects with error. |