Consumer with no credit can cause messages not to be seen by other consumers on 
that queue
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                 Key: QPID-1660
                 URL: https://issues.apache.org/jira/browse/QPID-1660
             Project: Qpid
          Issue Type: Bug
          Components: C++ Broker
    Affects Versions: M4
            Reporter: Gordon Sim
            Assignee: Gordon Sim
             Fix For: M5


Create a queue and publish one message to it. Then start a consumer 
(pre-acquiring subscription), with credit for one message. When the message is 
delivered, sleep for a short while and start a new consumer on the same queue. 
Then have the first consumer release the message.

The released message is now available for redelivery. Unfortunately the first 
consumer is picked as the consumer to be notified of this. That consumers 
connection then attempts to deliver the message but finds it has insufficient 
credit. The second consumer however is not notified and the broker does not 
attempt to dispatch the message.

(This is a bug introduced by the change in r721685  which was intended to fix 
QPID-1280).

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