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treemanifests: store whether a lazydirs entry needs copied after materializing
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Authored by spectral on Oct 3 2018, 6:22 PM.

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Summary

Due to the way that things like manifestlog.get caches its values, without
making a copy (if necessary) after calling readsubtree(), we might end up
adjusting the state of the same object on different contexts, breaking things
like dirty state tracking (and probably other things).

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