STR:

• Set ENABLE_FLUTTER_DESKTOP to true in dart.env
• Clone https://github.com/google/flutter-desktop-embedding.git
• Open flutter-desktop-embedding/example in VS Code
• From a terminal, flutter run in flutter-desktop-embedding/example to launch the process outside of VS Code
• Attempt to attach with Debug: Attach to Flutter Process

The desired behavior in this case is to prompt for a URI, but instead it goes directly into a mode where it waits for a connection (based on previous discussion, it sounds like it's scanning for a log message that's never going to arrive).

I have tested with a launch.json config using the URI (using 2.26b1) and it works fine, but that's a fairly painful process now that the auth token system prevents just hard-coding an observatory URI in both the app and the config and leaving it alone; every new run requires editing the launch.json again.