view CONTRIBUTING @ 33725:86ea201eaeb9

repair: move manifest strip to a separate function

This moves manifest stripping to a separate function so implementations of the
manifest that don't support stripping can replace this function with a no-op.

I considered adding a strip api to the manifestlog, so other implementations
could make it a no-op there, but it seems like strip might be unique to the
revlog implementation, and therefore shouldn't be present on the generic api.

Differential Revision: https://phab.mercurial-scm.org/D292

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