corruption: backout changeset 49fd21f32695 (issue6528) inverting the parent is masking copy information leading to bad content being fetched and bad status result. Since 49fd21f32695, exchange can actively swap these parent corrupting existing changesets and triggering the corruption. Data corruption are considered critical so backing this out and doing and unscheduled release seems in order. Differential Revision: https://phab.mercurial-scm.org/D10995

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Test issue2761

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  $ hg init

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  $ touch to-be-deleted

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  $ hg add

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  adding to-be-deleted

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  $ hg ci -m first

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  $ echo a > to-be-deleted

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  $ hg ci -m second

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  $ rm to-be-deleted

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  $ hg diff -r 0

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Same issue, different code path

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  $ hg up -C

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ touch does-not-exist-in-1

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  $ hg add

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  adding does-not-exist-in-1

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  $ hg ci -m third

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  $ rm does-not-exist-in-1

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  $ hg diff -r 1