Debugger sometimes get stuck in "running" state even though it's paused

Moving from https://github.com/dart-lang/sdk/issues/40725.

If you run this:

void main() {
  var steps = 0;
  while (true) {
    steps++; // Breakpoint here
    print('Has run $steps steps');
  }
}

Then keep pressing F5, you’ll quickly end up in a state where VS Code thinks the app is running (it has a Pause button) but it is stopped at the breakpoint.

The issue seems to be that we process the response to the resume command sent to the VM after the PauseBreakpoint event, resulting in the UI being left in the “running” state when it’s actually paused.

The events in the log are in the correct order (suggesting they came from the VM in the correct order):

[shyndman]

So far so good 😃

[shyndman]

Amazing! I’ll use it for the day and report back.