Stopping a Dart CLI debug session during a test run while at a breakpoint when using SDK DAPs does not work

[DanTup]

Using the branch here, running the .solo() test times out during cleanup:

https://github.com/Dart-Code/Dart-Code/tree/bug-repro
5099a4d

It seems that the initial terminateRequest never completes, with just "Waiting for current test to finish".

We're supposed to unpause when we try to shutdown, so the tests should complete quite quickly, and then termination should complete normally. That doesn't seem to be happening though.

[DanTup]

Reproducible outside of the DC tests:

import 'package:test/test.dart';

void main() {
  group('group', () {
    test('test', () {
      expect(1, 2); // Hit breakpoint here then press Stop
    });
  });
}

[DanTup]

Fixed by dart-lang/sdk@53319cf.