Merge branch 'nd/fix-untracked-cache-invalidation'

Some bugs around "untracked cache" feature have been fixed. * nd/fix-untracked-cache-invalidation: dir.c: ignore paths containing .git when invalidating untracked cache dir.c: stop ignoring opendir() error in open_cached_dir() dir.c: fix missing dir invalidation in untracked code dir.c: avoid stat() in valid_cached_dir() status: add a failing test showing a core.untrackedCache bug