message: Fix merging content of INI files into the config
diff: @@ -169,8 +169,13 @@ void ini_consumer::key(std::string name) {
  void ini_consumer::value_impl(config_value&& x) {
  auto dict = get_if<config_value::dictionary>(&x);
  - if (dict != nullptr && !dict->empty())
  - cfg_.emplace(std::move(current_key), std::move(*dict));
  + if (dict != nullptr && !dict->empty()) {
  + // We need to "merge" values into the destination, because it can already
  + // contain any number of unrelated entries.
  + auto& dst = cfg_[current_key];
  + for (auto& entry : *dict)
  + dst.insert_or_assign(entry.first, std::move(entry.second));
  + }
  }
  } // namespace detail
  