public MainWindowViewModel(IViewServiceProvider viewServiceProvider, string startupFileName)
{
_viewService = viewServiceProvider;
_errorMessages.CollectionChanged += (_, __) => HasErrorMessages = _errorMessages.Count > 0;
_host = new CsvEditSharpApi();
Workspace = new CsvEditSharpWorkspace(_host, _errorMessages);
ConfigurationDoc = new TextDocument(StringTextSource.Empty);
QueryDoc = new TextDocument(new StringTextSource("api.Query<FieldData>( records => records.Where(row => true).OrderBy(row => row) );"));
CurrentFilePath = string.Empty;
CurrentFileName = "(Empty)";
CurrentConfigName = "(Empty)";
SelectedTab = 0;
_startupFilePath = startupFileName;
}