Function on_unblocked 

pub fn on_unblocked(
    child: impl IntoUiNode,
    handler: Box<dyn FnMut(&()) -> HandlerResult + Send>,
) -> UiNode

Widget interactions now unblocked.

Note that the widget may still be disabled.

See on_blocked_changed for a more general event.

Route

This event property uses a direct route, that is, it cannot be intercepted in parent widgets.