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Fix pg_recvlogical avoidance of superfluous Standby Status Update.
The defect suppressed a Standby Status Update message when bytes flushed to disk had changed but bytes received had not changed. If pg_recvlogical then exited with no intervening Standby Status Update, the next pg_recvlogical repeated already-flushed records. The defect could also cause superfluous messages, which are functionally harmless. Back-patch to 9.5 (all supported versions). Discussion: https://postgr.es/m/20200502221647.GA3941274@rfd.leadboat.com
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@ -121,7 +121,7 @@ sendFeedback(PGconn *conn, int64 now, bool force, bool replyRequested)
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*/
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if (!force &&
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last_written_lsn == output_written_lsn &&
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last_fsync_lsn != output_fsync_lsn)
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last_fsync_lsn == output_fsync_lsn)
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return true;
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if (verbose)
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