public @NlsSafe @Nullable String getRelativePath() {
    if (relativePath == null) {
      //For configuration like "d:/.hg" File.getParent method has minimal prefix length, so vcsRoot will be "d:", getParent will be "d:/".
      relativePath = FileUtil.getRelativePath(VfsUtilCore.virtualToIoFile(vcsRoot), file);
    }
    return relativePath;
  }
public @NlsSafe @Nullable String getRelativePath()