Function serializeFolders

app/src/DataModel/ProjectModel.cpp:147–154

 */
template<typename Folder>
static QJsonArray serializeFolders(const std::vector<Folder>& folders)
{
  QJsonArray arr;
  for (const auto& f : std::as_const(folders))
    arr.append(DataModel::serialize(f));

  return arr;
}

/**
 * @brief Returns a unique title for a duplicated item using a numbered " (N)" suffix.