largefiles: fix commit of a directory with no largefile changes (issue4330) When a directory is named in the commit file list, the previous behavior was to walk the list, and if no normal files in the directory were also named, add the corresponding standin for each largefile in that directory. The directory is then dropped from the list, so that committing a directory with no normal file changes works. It then added the corresponding standin directory for the first largefile seen, by prefixing it with '.hglf/'. The latter is unnecessary since each affected largefile is explicitly referenced by its standin in the list. It also caused an abort if there were no changed largefiles in the directory, because none of its standins changed: abort: .hglf/foo/bar: no match under directory! This list of files is used to tweak a matcher in lfutil.updatestandinsbymatch(), which is what is passed to commit(). The status() call that is ultimately done in the commit code with this matcher seems to have some OS specific differences. It is not necessary to append '.' for Windows to run the largefiles tests cleanly. But if '.' is not added to the list, the match function isn't called on Linux, so status() would miss any normal files that were also in a named directory. The commit then proceeds without those normal files, or says "nothing changed" if there were no changed largefiles in the directory. This is not filesystem specific, as VFAT on Linux had the same behavior as when run on ext4. It is also not an issue with lfilesrepo.status(), since that only calls the overridden implementation when paths are passed to commit. I dont have access to an OS X machine ATM to test there. Maybe there's a better way to do this. But since the standin directory for the first largefile was previously being added, and that caused the same walk in status(), there's no preformance change to this. There is no danger of erroneously committing files in '.', because the original match function is called, and if it fails, the lfutil.updatestandinsbymatch() tweaked matcher only indicates a match if the file is in the list of standins- and '.' never is. The added tests confirm this.