Set pause_isolates_on_start flag if --start-paused #169392

srujzs · 2025-05-23T20:58:35Z

This enables breakpoint management for hot restart and hot reload. --start-paused is passed by VS code.

Also fixes a small issue where we're not passing the isolate ID when hot reloading. It doesn't matter what we pass as there's only one isolate, but we should keep consistent and use the isolate ID that already exists.

dart-lang/sdk#60186

Pre-launch Checklist

I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
I read the [Tree Hygiene] wiki page, which explains my responsibilities.
I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
I signed the [CLA].
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is [test-exempt].
I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
All existing and new tests are passing.

This enables breakpoint management for hot restart and hot reload. --start-paused is passed by VS code. Also fixes a small issue where we're not passing the isolate ID when hot reloading. It doesn't matter what we pass as there's only one isolate, but we should keep consistent and use the isolate ID that already exists.

flutter-dashboard · 2025-05-23T20:58:38Z

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

nshahan

Changes looks reasonable to me but your description mentions that vscode will pass --start-paused. I'm hoping that intellij does as well?

srujzs · 2025-05-24T00:20:05Z

I'm not really sure where the IntelliJ code lives unfortunately, but it would need to in order to make breakpoints and such work.

packages/flutter_tools/lib/src/vmservice.dart

packages/flutter_tools/lib/src/isolated/resident_web_runner.dart

packages/flutter_tools/test/general.shard/resident_web_runner_test.dart

…/flutter#169392)

flutter/flutter@4372bfb...0e536eb 2025-05-28 [email protected] Introduces FlutterPluginRegistrant protocol. (flutter/flutter#169399) 2025-05-28 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Initialize `default-flavor` in `FlutterCommand`, adds integration test. (#169298)" (flutter/flutter#169581) 2025-05-28 [email protected] Initialize `default-flavor` in `FlutterCommand`, adds integration test. (flutter/flutter#169298) 2025-05-28 [email protected] Update DEPS to add dart-lang/ai repo (flutter/flutter#169540) 2025-05-28 [email protected] Roll Skia from 92311f2ba0b7 to 82d326fc2148 (1 revision) (flutter/flutter#169552) 2025-05-28 [email protected] dev/bots: improve service worker test code (flutter/flutter#169231) 2025-05-28 [email protected] Make Android team platform view TESTOWNERS (flutter/flutter#169297) 2025-05-28 [email protected] Roll Skia from 044f58f78a73 to 92311f2ba0b7 (9 revisions) (flutter/flutter#169542) 2025-05-27 [email protected] Roll Skia from 443f5257f382 to 044f58f78a73 (16 revisions) (flutter/flutter#169530) 2025-05-27 [email protected] [web] Fix unresponsive input above SelectionArea in Safari and Firefox. (flutter/flutter#167275) 2025-05-27 [email protected] Set pause_isolates_on_start flag if --start-paused (flutter/flutter#169392) 2025-05-27 [email protected] Roll Packages from af0b9a9 to 6eebe72 (24 revisions) (flutter/flutter#169514) 2025-05-27 [email protected] Roll Fuchsia Linux SDK from 5mpmPsuD8rpeiJizT... to nC9hLWjYVlChDTEPh... (flutter/flutter#169498) 2025-05-27 [email protected] Split hint from label and expose it via aria-description or aria-describedby (flutter/flutter#169157) 2025-05-26 [email protected] 🐛 Normalize generated file paths for the l10n generator (flutter/flutter#169467) 2025-05-26 [email protected] Roll Dart SDK from d811152316e4 to 6aeb798bdbe2 (2 revisions) (flutter/flutter#169478) 2025-05-26 [email protected] [Cupertino] Apply RSuperellipse to most Cupertino widgets (flutter/flutter#167784) 2025-05-26 [email protected] Roll `package:dds` to 5.0.2 (flutter/flutter#169471) 2025-05-26 [email protected] Use `.flutter-plugins-dependencies` for crash reporting. (flutter/flutter#169319) 2025-05-26 [email protected] Remove now disabled code that would generate `.flutter-plugins`. (flutter/flutter#169320) 2025-05-26 [email protected] Roll Dart SDK from 7dab9bffe1f7 to d811152316e4 (1 revision) (flutter/flutter#169473) 2025-05-26 [email protected] Precise browser resizing with integration_test and driver (flutter/flutter#160678) 2025-05-26 [email protected] Add `/coverage/` to `.gitignore.tmp` (flutter/flutter#169387) 2025-05-26 [email protected] Make test output with encoded `dart-defines=...` human readable. (flutter/flutter#169353) 2025-05-26 [email protected] Use at most `PROC~/2` tasks to transform assets. (flutter/flutter#169386) 2025-05-26 [email protected] Forward exit code from dart test to flutter test (flutter/flutter#168604) 2025-05-26 [email protected] Fix warning when building for macOS desktop (flutter/flutter#165996) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…r#9334) flutter/flutter@4372bfb...0e536eb 2025-05-28 [email protected] Introduces FlutterPluginRegistrant protocol. (flutter/flutter#169399) 2025-05-28 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Initialize `default-flavor` in `FlutterCommand`, adds integration test. (#169298)" (flutter/flutter#169581) 2025-05-28 [email protected] Initialize `default-flavor` in `FlutterCommand`, adds integration test. (flutter/flutter#169298) 2025-05-28 [email protected] Update DEPS to add dart-lang/ai repo (flutter/flutter#169540) 2025-05-28 [email protected] Roll Skia from 92311f2ba0b7 to 82d326fc2148 (1 revision) (flutter/flutter#169552) 2025-05-28 [email protected] dev/bots: improve service worker test code (flutter/flutter#169231) 2025-05-28 [email protected] Make Android team platform view TESTOWNERS (flutter/flutter#169297) 2025-05-28 [email protected] Roll Skia from 044f58f78a73 to 92311f2ba0b7 (9 revisions) (flutter/flutter#169542) 2025-05-27 [email protected] Roll Skia from 443f5257f382 to 044f58f78a73 (16 revisions) (flutter/flutter#169530) 2025-05-27 [email protected] [web] Fix unresponsive input above SelectionArea in Safari and Firefox. (flutter/flutter#167275) 2025-05-27 [email protected] Set pause_isolates_on_start flag if --start-paused (flutter/flutter#169392) 2025-05-27 [email protected] Roll Packages from af0b9a9 to 6eebe72 (24 revisions) (flutter/flutter#169514) 2025-05-27 [email protected] Roll Fuchsia Linux SDK from 5mpmPsuD8rpeiJizT... to nC9hLWjYVlChDTEPh... (flutter/flutter#169498) 2025-05-27 [email protected] Split hint from label and expose it via aria-description or aria-describedby (flutter/flutter#169157) 2025-05-26 [email protected] 🐛 Normalize generated file paths for the l10n generator (flutter/flutter#169467) 2025-05-26 [email protected] Roll Dart SDK from d811152316e4 to 6aeb798bdbe2 (2 revisions) (flutter/flutter#169478) 2025-05-26 [email protected] [Cupertino] Apply RSuperellipse to most Cupertino widgets (flutter/flutter#167784) 2025-05-26 [email protected] Roll `package:dds` to 5.0.2 (flutter/flutter#169471) 2025-05-26 [email protected] Use `.flutter-plugins-dependencies` for crash reporting. (flutter/flutter#169319) 2025-05-26 [email protected] Remove now disabled code that would generate `.flutter-plugins`. (flutter/flutter#169320) 2025-05-26 [email protected] Roll Dart SDK from 7dab9bffe1f7 to d811152316e4 (1 revision) (flutter/flutter#169473) 2025-05-26 [email protected] Precise browser resizing with integration_test and driver (flutter/flutter#160678) 2025-05-26 [email protected] Add `/coverage/` to `.gitignore.tmp` (flutter/flutter#169387) 2025-05-26 [email protected] Make test output with encoded `dart-defines=...` human readable. (flutter/flutter#169353) 2025-05-26 [email protected] Use at most `PROC~/2` tasks to transform assets. (flutter/flutter#169386) 2025-05-26 [email protected] Forward exit code from dart test to flutter test (flutter/flutter#168604) 2025-05-26 [email protected] Fix warning when building for macOS desktop (flutter/flutter#165996) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…/flutter#169392)

srujzs requested review from bkonyi and nshahan May 23, 2025 20:58

github-actions bot added the tool Affects the "flutter" command-line tool. See also t: labels. label May 23, 2025

nshahan approved these changes May 23, 2025

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Fix expectations for tests and treat isolate id as nullable

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bkonyi reviewed May 26, 2025

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Address review comments

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srujzs added the autosubmit Merge PR when tree becomes green via auto submit App label May 27, 2025

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Merged via the queue into flutter:master with commit 9737016 May 27, 2025
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Roll Flutter from 4372bfbc6c23 to 973701688c46 (17 revisions) flutter/packages#9327

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Roll Flutter from 4372bfbc6c23 to 5d013c73baa7 (26 revisions) flutter/packages#9333

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973701688 Set pause_isolates_on_start flag if --start-paused (flutter…

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Roll Flutter from 4372bfbc6c23 to 0e536eb9fe4b (27 revisions) flutter/packages#9334

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…/flutter#169392)

engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 16, 2025

973701688 Set pause_isolates_on_start flag if --start-paused (flutter…

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