editor: relax copyfrom dir checks to avoid extra missing entries When renaming a branch you get something like: D /branch/bar A /branch/foo (from /branch/foo:42) Unfortunately, the branch layout for the revision being converted is computed before starting to convert it. It means the copyfrom path supplied in the add_directory() for /branch/foo will be be considered invalid, be added to missing and fetched the slow way despite being in the repository history. Avoid that by checking the path looks like a branch path and matching it with the filemap. It will be resolved afterwards anyway.