[Messenger] DispatchAfterCurrentBusMiddleware does not cancel messages from delayed handlers #32497
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This is a fix for #32370. There is no need for anything sophisticated. There is no recursion or fancy stuff going on, just a queue of message handled sequentially. A simple variable is enough to keep track of the queue state.
Thanks @Nyholm for the test, it would clearly have been the hardest part of the job.