In pipeline mode after queuing a message to be sent we would flush the buffer if the size of the buffer passed some threshold. The only message type that we didn't do that for was the Flush message. This addresses that oversight.
I noticed this discrepancy while reviewing the PQsendSyncMessage/PQpipelinePutSync patchset.
v1-0001-Call-pqPipelineFlush-from-PQsendFlushRequest.patch
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