Dart DevTools automatically resumes when opening the tool

[jensjoha]

Say I have this file t.dart:

import "dart:developer";

void main() {
  int i = 42;
  debugger();
  print(i);
}

and I run it like this:

out/ReleaseX64/dart --enable-vm-service t.dart

I'll be told something like

The Dart VM service is listening on http://127.0.0.1:8181/QHkuXd4SI-g=/
The Dart DevTools debugger and profiler is available at: http://127.0.0.1:8181/QHkuXd4SI-g=/devtools/?uri=ws://127.0.0.1:8181/QHkuXd4SI-g=/ws

Going to either address will take me to a webpage that after a while says "Disconnected":

At the same time the script will have finished in the terminal:

$ out/ReleaseX64/dart --enable-vm-service t.dart
The Dart VM service is listening on http://127.0.0.1:8181/QHkuXd4SI-g=/
The Dart DevTools debugger and profiler is available at: http://127.0.0.1:8181/QHkuXd4SI-g=/devtools/?uri=ws://127.0.0.1:8181/QHkuXd4SI-g=/ws
42
$ echo $?
0

It seems that it has automatically resumed without me asking it to. Indeed adding another debugger() call and it doesn't happen:

import "dart:developer";

void main() {
  int i = 42;
  print("Will wait");
  debugger();

  print("Will wait again");
  debugger();

  print(i);
}

after opening the tool the output in the terminal is now

$ out/ReleaseX64/dart --enable-vm-service t.dart
Will wait
The Dart VM service is listening on http://127.0.0.1:8181/6pwtMho6irY=/
The Dart DevTools debugger and profiler is available at: http://127.0.0.1:8181/6pwtMho6irY=/devtools/?uri=ws://127.0.0.1:8181/6pwtMho6irY=/ws
Will wait again

Is this the intended behavior, and if it is, why? If not can we have it fixed?

This started to happen with adfbcc7657248be8a64ad1313c15f7a58cf15e23