rebase: drop unnecessary parentchange call We're calling localrepo.setparents here, not dirstate.setparents. localrepo.setparents calls dirstate.parentchange already.

hidden: remove unnecessary guard condition The "if visible" guard is now pretty pointless, because the function call it guards will do almost no work anyway when there are no visible revisions. We can also stop wrapping "visible" in a set since it just needs to be an iterable now.