@Nullable
  private static Boolean decideOnShowRememberPasswordOption(@Nullable String password, boolean rememberByDefault) {
    // if password saving is disabled, don't show the checkbox.
    if (PasswordSafe.getInstance().isMemoryOnly()) {
      return null;
    }
    // if password is prefilled, it is expected to continue remembering it.
    if (!StringUtil.isEmptyOrSpaces(password)) {
      return true;
    }
    return rememberByDefault;
  }
@Nullable
  private static Boolean decideOnShowRememberPasswordOption(@Nullable String password, boolean rememberByDefault)