clfilter: prevent unwanted warning about filtered parents as unknown...
clfilter: prevent unwanted warning about filtered parents as unknown
During changectx __init__ the dirstate's parents MAY be checked. If
the repo is filtered, this check will complain "working directory has
unknown parents" even if the parents are perfectly known.
This may happen when the repo is used for serving and the dirstate has
parents that are secret, as those secret changesets will be filtered.