Method IsDirectoryCanBeOpened

ImGuiFileDialog.cpp:459–478

class FileSystemStd : public IGFD::IFileSystem {
public:
    bool IsDirectoryCanBeOpened(const std::string& vName) override {
        bool bExists = false;
        if (!vName.empty()) {
            namespace fs  = std::filesystem;
            auto pathName = stringToPath(vName);
            try {
                // interesting, in the case of a protected dir or for any reason the dir cant be opened
                // this func will work but will say nothing more . not like the dirent version
                bExists = fs::is_directory(pathName);
                // test if can be opened, this function can thrown an exception if there is an issue with this dir
                // here, the dir_iter is need else not exception is thrown..
                const auto dir_iter = fs::directory_iterator(pathName);
                (void)dir_iter;  // for avoid unused warnings
            } catch (const std::exception& /*ex*/) {
                // fail so this dir cant be opened
                bExists = false;
            }
        }
        return bExists;  // this is not a directory!
    }
    bool IsDirectoryExist(const std::string& vName) override {
        if (!vName.empty()) {
            namespace fs = std::filesystem;