@Override
  public boolean isPartOfPackagePrefix(@NotNull String packageName) {
    final Collection<String> packagePrefixes = myFileManager.getNonTrivialPackagePrefixes();
    for (final String subpackageName : packagePrefixes) {
      if (PsiNameHelper.isSubpackageOf(subpackageName, packageName)) return true;
    }
    return false;
  }
@Override
  public boolean isPartOfPackagePrefix(@NotNull String packageName)