message: [contour] Fixes false warning on superfluous config key, `on_mouse_select`.
diff: @@ -1429,6 +1429,7 @@ void loadConfigFromFile(Config& _config, FileSystem::path const& _fileName)
  if (doc["on_mouse_select"].IsDefined())
  {
  + usedKeys.emplace("on_mouse_select");
  auto const value = toUpper(doc["on_mouse_select"].as<string>());
  auto constexpr mappings = array {
  pair { "COPYTOCLIPBOARD", SelectionAction::CopyToClipboard },
  