Function folderExists

app/src/DataModel/ProjectModel.cpp:71–75

 */
template<typename Folder>
static bool folderExists(const std::vector<Folder>& folders, int id)
{
  return std::any_of(
    folders.begin(), folders.end(), [id](const auto& f) { return f.folderId == id; });
}

/**
 * @brief Returns true when @p candidate is @p folderId or sits inside its subtree.