@SuppressWarnings("unused")
  // for future custom additional patch reader implementation
  public boolean isMqPatch(@NotNull File file) {
    return DvcsUtil.tryLoadFileOrReturn(file, "").startsWith(HG_PATCH_PREFIX);
  }
@SuppressWarnings("unused")
  // for future custom additional patch reader implementation
  public boolean isMqPatch(@NotNull File file)