Notify user when the Dart SDK differs from the one bundled with Flutter

[pq]

It may be confusing to users if the default SDK defined in the Dart Plugin and the one bundled with Flutter disagree. An easy mitigation would be to define an inspection that detects this case and notifies the user. They may choose to correct it or ignore it.

Two places where this might make sense:

• in Flutter SDK configuration
• as an inspection that generates an editor notification

In both places the warning should be dismissible.

cc @devoncarew

[eseidelGoogle]

See also flutter/flutter#3449

[sethladd]

It will definitely be confusing :)

Please override whatever Dart SDK is configured by the user over in the dart plugin, and use whatever Dart SDK is vendored by Flutter when editing a Flutter app.

Also, consider allowing each project to have a Flutter SDK setting. A global setting, for all projects across the IDE, makes it hard to have project A using Flutter 1.2.3 and project B using Flutter 2.1.1.

[pq]

A global setting, for all projects across the IDE, makes it hard to have project A using Flutter 1.2.3 and project B using Flutter 2.1.1.

Right. This brings up the larger issue which is that the Dart Plugin currently does not support per-project SDKs....

cc @jwren for some background.

[sethladd]

To be clear, Flutter isn't released in a way that makes this super easy. But, we'll get there before we know it. And as long as we're talking about configurations, I'd like us to think about how to do per-project SDK configurations.

[eseidelGoogle]

This is a large issue, see flutter/flutter#3770 for more context. Our current focus is internal where this doesn't occur, but as Seth notes, external deployments are going to sneak up on us soon. So we definitely need to design for a world where folks can have multiple flutter projects not all of which use the same versions of flutter (and thus Dart). Not sure what the entire solution looks like, but please do plan for such a world. :)

[pq]

Added a separate tracking bug for the per-project SDKs ask (#56). Thanks for all the input! :)

[pq]

An editor notification (in progress), that nags if the SDKs are not the same.

@sethladd : wordsmithing appreciated!

[jwren]

Great progress Phil!