Tells the feedback server to provide proper feedback for the give event to the user.
This is the sync version of [method@LfbEvent.trigger_feedback].
| this |
The event to trigger feedback for. |
| cancellable |
A Cancellable to cancel the operation or null. |
| callback |
A TaskReadyCallback to call when the request is satisfied or null. |
| user_data |
User data to pass to |