Wraps [method@Gio.
File.load_partial_contents_async].
| file |
a [iface@Gio.File] |
| read_more_callback |
callback to determine if more bytes should be loaded |
| read_more_callback_data |
user data for |
| read_more_callback_data_destroy |
destroys |
|
a [class@Dex.Future] that resolves to a [struct@GLib.Bytes] or rejects with error. |