Macro rat_widget::event::flow

macro_rules! flow {
    (log $n:ident: $x:expr) => { ... };
    ($x:expr) => { ... };
}

Breaks the control-flow if the block returns a value for with ConsumedEvent::is_consumed is true.

It then does the classic into()-conversion and returns.

Special widget result-types are encourage to map down to Outcome as a baseline.

The difference to flow is that this one Ok-wraps the result.

Extras: If you add a marker as in flow_ok!(log ident: {...}); the result of the operation is written to the log.