修复6.0二维码的bug

AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs

@@ -279,6 +279,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             StreamResourceInfo sri = Application.GetResourceStream(new Uri("pack://application:,,,/AIStudio.Wpf.DiagramDesigner;component/Images/FormatPainter.cur", UriKind.RelativeOrAbsolute));
             this.Cursor = new Cursor(sri.Stream);
+
             foreach (SelectableDesignerItemViewModelBase item in _viewModel.Items)
             {
                 item.IsHitTestVisible = false;