Pick the right observatory when multiple are available

[xster]

Sometimes when I attach to the selected device, I get

But theoretically, VSCode should know what the currently open project's app id should be and should just send it along.

[DanTup]

How do you get into the state where this happens?

Where do these IDs come from? Are they the same for each version of the app, or different for each platform?

VS Code doesn't currently know anything about the file structure of the native apps, so if they're in there I don't think we should go fishing for them. Maybe it would be better if there was a JSON version of this error (in --machine mode) that lets the editor present the options to the user and have them click them.

@jonahwilliams what do you think?

We already have some daemon-to-client requests (for expose-url) so we could potentially do something like that too (rather than terminating, just ask the client to make a choice and then continue when it responds).

[xster]

I think it was just from running one Flutter app, not closing the app (such as launching from CLI then detach). Repeat for a second app. Then go to VSCode for one of the projects and attach to Flutter on device.

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[DanTup]

Perhaps another simpler option here would be for flutter attach to automatically use the "current app" if it's been executed from within a project folder (or have a flag to do so)? That way the editor still doesn't need to know any of the platform-specific stuff, and Flutter presumably has easy access and knowledge to get the ID for the project?

[jonahwilliams]

The tool could try and determine whether their is a usable identifier in the current project.

If a terminal attached, we could prompt with the default being the detected project if found. If there is no terminal we can select the detected project, or exit if no project was detected.

WDUT?

[DanTup]

Yeah, that sounds good to me. I'm not sure how to do it though - I'm guessing this is iOS-only (from searching for the error) and probably starts with passing flutterProject in to here? I couldn't see an obvious way to find the ID for the project though (if it'd by easier for you to do it than explain, feel free 😄).