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Fix LagTrackerRead() for timeline increments

Bug was masked by error in running 004_timeline_switch.pl that wasfixed recently in7d68f22.Detective work by Alvaro Herrera and Tom LaneAuthor: Thomas Munro

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src/backend/replication
- walsender.c

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`‎src/backend/replication/walsender.c`

Lines changed: 10 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -3328,7 +3328,16 @@ LagTrackerRead(int head, XLogRecPtr lsn, TimestampTz now)`
`3328`	`3328`	`WalTimeSampleprev=LagTracker.last_read[head];`
`3329`	`3329`	`WalTimeSamplenext=LagTracker.buffer[LagTracker.read_heads[head]];`
`3330`	`3330`
`3331`		`-Assert(lsn >=prev.lsn);`
	`3331`	`+if (lsn<prev.lsn)`
	`3332`	`+{`
	`3333`	`+/*`
	`3334`	`+ * Reported LSNs shouldn't normally go backwards, but it's`
	`3335`	`+ * possible when there is a timeline change. Treat as not`
	`3336`	`+ * found.`
	`3337`	`+ */`
	`3338`	`+return-1;`
	`3339`	`+}`
	`3340`	`+`
`3332`	`3341`	`Assert(prev.lsn<next.lsn);`
`3333`	`3342`
`3334`	`3343`	`if (prev.time>next.time)`

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Commit8463880

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`‎src/backend/replication/walsender.c`

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