MAX_QUEUED_CONTINUATIONS feature not working in EventGenerator class

Since OAK-1422 the Continuation created in fullQueue() is put to the front of the List. This causes it to be taken right off the list again on the next call to generate() instead of first continuing with the rest of the list allowing it to shrink. As a result the list may grow up to 2 x MAX_QUEUED_CONTINUATIONS instead of 1 + MAX_QUEUED_CONTINUATIONS as anticipated.