mq: explicitly updatedir() even if patch() fails It already works that way in practice, and we intend to merge updatedir() into patch().

mq: allow to qpop/push with a dirty working copy (issue2780) It's safe to do so if the sets of changed files in the working copy and patches are disjoint.

patch: introduce changedfiles returns the set of all changed files in a given patch

debugindex: change output for generaldelta revlogs For generaldelta revlogs, reporting the deltaparent instead of the chain base makes more sense, since that's what's actually stored in the revlog.