[super_drag_and_drop] desktop_multi_window - DropContext already exists for isolate IsolateId (error and not working)

[kojang74]

To apply the Drag & Drop function to multiple windows in a desktop environment(macOS, Windows),

I applied the DropRegion from the super_drag_and_drop package to the example in the desktop_multi_window package, but the Drop function does not work properly, with the following error occurring occasionally.

What should I do? Please help me.

Error message

[super_native_extensions::drop_manager] DropContext already exists for isolate IsolateId

Example

The DropRegion class was applied to the desktop_multi_window example program as follows.

https://github.com/MixinNetwork/flutter-plugins/blob/main/packages/desktop_multi_window/example/lib/windows/main_window.dart

class _ExampleMainWindowState extends State<ExampleMainWindow> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DropRegion(
        // Formats this region can accept.
        formats: Formats.standardFormats,
        hitTestBehavior: HitTestBehavior.opaque,
        onDropOver: (event) {
          print("===========> Main Window : onDropOver.........");
          return event.session.allowedOperations.firstOrNull ?? DropOperation.none;
        },
        onPerformDrop: (event) async {
          print("===========> Main Window : onPerformDrop.........");
        },
        child: Scaffold(
...

https://github.com/MixinNetwork/flutter-plugins/blob/main/packages/desktop_multi_window/example/lib/windows/sample_window.dart

class SampleWindow extends StatelessWidget {
  const SampleWindow({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DropRegion(
        // Formats this region can accept.
        formats: Formats.standardFormats,
        hitTestBehavior: HitTestBehavior.opaque,
        onDropOver: (event) {
          print("===========> Sample !!!! : onDropOver.........");
          return event.session.allowedOperations.firstOrNull ?? DropOperation.none;
        },
        onPerformDrop: (event) async {
          print("===========> Sample !!!! : onPerformDrop.........");
        },
        child: Scaffold(
...

[kojang74]

Additionally

When applied the ContextMenuWidget from the super_context_menu package to the example in the desktop_multi_window package, the App crashes with the following error message.

Error message

2026-04-24T01:59:39.680Z WARN [super_native_extensions::menu_manager] MenuContext already exists for isolate IsolateId(6134022432)

thread '' panicked at src/./darwin/macos/menu.rs:384:49:
called Option::unwrap() on a None value
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
Lost connection to device.

[corneliuspace]

Hi there try this
dependency_overrides:
irondash_message_channel:
git:
url: https://github.com/corneliuspace/irondash-fix-isolateId-duplication
ref: fix/same-isolate-id-desktop-multi-windows
path: message_channel/dart

you can check the repo to see the changes to not have anymore the same isolate id