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actions: introduce function to calculate downgrades
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Authored by pulkit on Dec 16 2020, 5:14 AM.

Details

Summary

An ugrade operation can also downgrade/remove some format variants. Before this
patch there was no clean way to find out all such variants which will be
removed. This patch adds a function for that.

It will be used in next patch.

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Repository
rHG Mercurial
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Unit
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