Returns the restore token for this session or NULL if none exists.
This token can be passed to [method@InputCaptureSession.set_restore_token] for a future session to restore this session, possibly skipping interactive permission dialogs.
This method only returns a token for a session created with [method@Portal.create_input_capture_session2] and only once [ method@InputCaptureSession.start_finish] has completed.
The token may change with every session.
| this |
a [class@InputCaptureSession] |
|
the restore token or NULL |