public String revertPath(String path) {
    if (Paths.equals(getPath(), getOldPath())) return path;

    String relative = Paths.relativeIfUnder(path, myPath);
    if (relative == null) return path;
    if (relative.isEmpty()) return getOldPath();
    return Paths.appended(getOldPath(), relative);
  }
public String revertPath(String path)