QFileInfo::isWritable returns true for directories with read-only attribute

  QDir tTestDir("C:\\Temp\\TestDir");
  if (tTestDir.mkpath(tTestDir.absolutePath()))
  {
    QFile::setPermissions(tTestDir.absolutePath(),
                          QFile::ReadOwner | QFile::ExeOwner |
                          QFile::ReadGroup | QFile::ExeGroup |
                          QFile::ReadUser | QFile::ExeUser |
                          QFile::ReadOther | QFile::ExeOther);
    if (QFileInfo(tTestDir.absolutePath()).isWritable())
      std::cout << qPrintable(tTestDir.absolutePath()) << " is writable"
                << std::endl;
    else
      std::cout << qPrintable(tTestDir.absolutePath()) << " is not writable"
                << std::endl;
    tTestDir.rmpath(tTestDir.absolutePath());
  }