Merge "Avoid unnecessary WindowInfo copies" into main

}

Result<void> validateWindowInfosUpdate(const gui::WindowInfosUpdate& update) {

    struct HashFunction {

        size_t operator()(const WindowInfo& info) const { return info.id; }

    };

    std::unordered_set<WindowInfo, HashFunction> windowSet;

    std::unordered_set<int32_t> windowIds;

    for (const WindowInfo& info : update.windowInfos) {

        const auto [_, inserted] = windowSet.insert(info);

        const auto [_, inserted] = windowIds.insert(info.id);

        if (!inserted) {

            return Error() << "Duplicate entry for " << info;

        }