private @NotNull Set<VcsRoot> scanForDirectory(@NotNull VirtualFile dirToScan) {
    if (!VcsRootChecker.EXTENSION_POINT_NAME.hasAnyExtensions()) {
      return Collections.emptySet();
    }

    Set<VcsRoot> detectedRoots = new HashSet<>();
    Map<VirtualFile, Boolean> scannedDirs = new HashMap<>();

    detectedRoots.addAll(scanForRootsInsideDir(myProject, dirToScan, null, scannedDirs));
    detectedRoots.addAll(scanForRootsAboveDirs(Collections.singletonList(dirToScan), scannedDirs, detectedRoots));
    return detectedRoots;
  }
private @NotNull Set<VcsRoot> scanForDirectory(@NotNull VirtualFile dirToScan)