[DYN-8055] Placement of UI pop up for input/output ports is not accurate (#16250)

Author: ivaylo-matov

src/DynamoCoreWpf/ViewModels/Core/PortViewModel.cs

@@ -402,6 +402,9 @@ private CustomPopupPlacement[] PlacePortContextMenu(Size popupSize, Size targetS
             var zoom = node.WorkspaceViewModel.Zoom;
             var dpiScale = GetDpiScale();
 
+            var source = PresentationSource.FromVisual(Application.Current.MainWindow);
+            var dpiScale = source?.CompositionTarget?.TransformToDevice.M22 ?? 1.0;
+
             double x;
             var scaledWidth = autocompletePopupSpacing * targetSize.Width / node.ActualWidth;