[merge][#109520] gc of LockableFiles should not warn or unlock

[Aaron Bentley]

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Andrew Bennetts wrote:
> (I hope putting a patch in this email doesn't override your patch in
> BundleBuggy, even if people don't like my patch yours should still be merged
> IMO.)

The supersede mechanism completely ignores threading.  It is based on
revision ancestry.  If a merge request comes in that includes merging
the heads of other merge requests, those requests are considered superseded.

Including patches is incredibly safe.

Aaron
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