match: introduce badmatch() to eliminate long callback chains with subrepos Various bit of code replace the bad method on matchers, and then delegate to the original bad method after doing some custom processing. At least some of these forget to restore the original method when the need has passed, and then when the matcher is passed to the next subrepo (even a sibling), another layer is added such that the chain looks like: bad2 -> bad1 -> original At best, this is a waste of processing, but sometimes spurious messages can be emitted (e.g. ccb1623266eb). The trick with this copy of the matcher is to make sure it is *not* passed to any subrepo- the original must be passed instead.