Breakpoints in Dart SDK code are not hit

I tried to put breakpoints in Dart SDK code but those breakpoints are ignored.

To reproduce this I setup an environment with :

• A fresh SDK installation : Dart SDK version: 2.15.0-68.0.dev (dev) (Wed Sep 1 05:51:32 2021 -0700) on "linux_x64"
• A fresh Dart project created from DartCode command Dart: New Project and selecting simple-console template
• Try to put a breakpoint in print source code

I used two ways to put this breakpoint : 1 - Using ‘Go to definition’ and add the breakpoint 2 - Launching a debug session and ‘Step into’ to reach Dart SDK source code and add the breakpoint

Two breakpoints were created with different paths, neither works :

DartCode debugging logs : Dart-Code-Log-2021-08-05 13-41-24.txt

Corresponding session in video : https://user-images.githubusercontent.com/840911/132003058-ce293e04-b9d7-4642-bc9e-2889701ea086.mp4

[DanTup]

This issue has been fixed for some upcoming releases. I tested it today using the current beta version of the Dart SDK (2.18.0), the pre-release v3.47.20220808 version of the Dart extension, and with the dart.previewSdkDaps: true setting.

When using all of these, the Dart SDK libraryes (such as dart:core) are not mapped back to your local SDK sources (the same ones you get to using Go-to-Definition in the editor), and breakpoints set in those files will be mapped over to dart:core by the debug adapter.

Some of these pieces are not released in stable releases yet, and the SDK DAPs will be a gradual roll out over the coming releases (although you can opt-in explicitly with the dart.previewSdkDaps: true setting).

Please file issues if you still have issues with this once you have confirmed you’re on:

• = v3.47.20220808 of the Dart extension

• = v2.18.0-271.8.beta of the Dart SDK (or a Flutter SDK that includes this version)

• The dart.previewSdkDaps setting set to true, or you have confirmed that you’ve been enabled automatically as part of the gradual rollout (this will include the text “Running SDK DAP” in the log opened by the Dart: Open Extension Log command).

[DanTup]

I noticed today that this fix does not entirely work when running Flutter apps - they return a different org-darlang-app:/// URI to the Dart SDK.

I’ve filed https://github.com/Dart-Code/Dart-Code/issues/4128 to track this, and https://github.com/dart-lang/sdk/issues/49863 to find out if it’s a bug, and if not exactly what the mapping rules are.