Update fake_codec.dart to use Future.value instead of SynchronousFuture #152182
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact "@test-exemption-reviewer" in the #hackers channel in Chat (don't just cc them here, they won't see it! Use Discord!). 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. |
github-actions
bot
added
the
framework
nate-thegrate
approved these changes
Jul 24, 2024
Contributor
nate-thegrate
left a comment
nate-thegrate
left a comment
There was a problem hiding this comment.
LGTM!
Hopefully we can have a smooth transition to the next Dart Dev Compiler version 🤞
yjbanov
reviewed
Jul 24, 2024
| final SynchronousFuture<ui.FrameInfo> result = | ||
| SynchronousFuture<ui.FrameInfo>(_frameInfos[_nextFrame]); | ||
| final Future<ui.FrameInfo> result = | ||
| Future<ui.FrameInfo>.value(_frameInfos[_nextFrame]); |
Contributor
There was a problem hiding this comment.
Is SynchronousFuture broken, or does it simply not suitable for this use-case because it's too eager to call the then callback? (or something else?)
Contributor
Author
There was a problem hiding this comment.
There's actually some active discussion going on about SynchronousFuture here:
#151579 (comment)
I personally don't know the history of why SynchronousFuture was added in the first place. It provides a very different behavior than a normal Future and doesn't really conform to the Dart spec.
I don't know that its "broken" though... it does what it seems like it was designed to do. But in this specific case it definitely causes an incorrect render order given a fully valid implementation of Dart's async semantics. This same bug would also occur if the test were run with dart2js.
yjbanov
added
the
autosubmit
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 25, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 25, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 25, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 25, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 25, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 26, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 26, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 26, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 26, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 27, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 27, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 28, 2024
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jul 28, 2024
auto-submit bot
pushed a commit
to flutter/packages
that referenced
this pull request
Jul 29, 2024
Roll Flutter from 7d5c1c0 to 031dc3d (97 revisions) flutter/flutter@7d5c1c0...031dc3d 2024-07-26 [email protected] Roll Flutter Engine from 342a42547822 to 354abf2800a0 (7 revisions) (flutter/flutter#152385) 2024-07-26 [email protected] Use more CORS headers for flutter run server (flutter/flutter#152249) 2024-07-26 [email protected] Manual roll Flutter Engine from 8714b54a87c0 to 342a42547822 (6 revisions) (flutter/flutter#152379) 2024-07-26 [email protected] feat: Add drag handle size to be configurable based on given size (flutter/flutter#152085) 2024-07-26 [email protected] Add and use an integration test with native(ADB) screenshots (flutter/flutter#152326) 2024-07-26 [email protected] Roll Packages from 19daf6f to 3d358d9 (4 revisions) (flutter/flutter#152372) 2024-07-26 [email protected] Add test for range_slider.0.dart (flutter/flutter#152152) 2024-07-26 [email protected] Introduce `TabBar.indicatorAnimation` to customize tab indicator animation (flutter/flutter#151746) 2024-07-26 [email protected] Roll Flutter Engine from 21629ece8b72 to 8714b54a87c0 (3 revisions) (flutter/flutter#152351) 2024-07-26 [email protected] Cleanup examples/api web load logic to latest (flutter/flutter#152349) 2024-07-26 [email protected] Adds a call to the `PlatformDispatcher` whenever the focus changes (flutter/flutter#151268) 2024-07-26 [email protected] Roll Flutter Engine from d665bf82dc32 to 21629ece8b72 (4 revisions) (flutter/flutter#152344) 2024-07-25 [email protected] `docImport`s for the widgets library (flutter/flutter#152339) 2024-07-25 [email protected] Set dart defines properly while in debug mode. (flutter/flutter#152262) 2024-07-25 49699333+dependabot[bot]@users.noreply.github.com Bump github/codeql-action from 3.25.13 to 3.25.14 (flutter/flutter#152342) 2024-07-25 [email protected] Roll Flutter Engine from 74785a771ae6 to d665bf82dc32 (2 revisions) (flutter/flutter#152340) 2024-07-25 [email protected] Cleanup InputDecoration.collapsed constructor (flutter/flutter#152165) 2024-07-25 [email protected] Add test for expansion_panel_list.expansion_panel_list_radio.0_test.dart (flutter/flutter#151730) 2024-07-25 [email protected] Roll Flutter Engine from f862a620cee4 to 74785a771ae6 (2 revisions) (flutter/flutter#152333) 2024-07-25 [email protected] Roll Packages from 1c319ac to 19daf6f (3 revisions) (flutter/flutter#152327) 2024-07-25 [email protected] Add a more typical / concrete example to IntrinsicHeight / IntrinsicWidth (flutter/flutter#152246) 2024-07-25 [email protected] Roll Flutter Engine from f47b4d8e145a to f862a620cee4 (1 revision) (flutter/flutter#152320) 2024-07-25 [email protected] Roll Flutter Engine from 74737820a8ee to f47b4d8e145a (7 revisions) (flutter/flutter#152314) 2024-07-25 [email protected] Flutter Web App: adds a11y semantic attributes to slider (flutter/flutter#151985) 2024-07-25 [email protected] Manual roll Flutter Engine from eb8fac2b1703 to 74737820a8ee (8 revisions) (flutter/flutter#152305) 2024-07-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Roll Flutter Engine from eb8fac2b1703 to a57655cccb55 (6 revisions) (#152293)" (flutter/flutter#152304) 2024-07-25 [email protected] Roll Flutter Engine from eb8fac2b1703 to a57655cccb55 (6 revisions) (flutter/flutter#152293) 2024-07-25 [email protected] Modify stepping integration test to accommodate new DDC async semantics. (flutter/flutter#152204) 2024-07-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Roll Flutter Engine from eb8fac2b1703 to e1259b86ba02 (2 revisions) (#152285)" (flutter/flutter#152289) 2024-07-25 [email protected] Update fake_codec.dart to use Future.value instead of SynchronousFuture (flutter/flutter#152182) 2024-07-25 [email protected] Roll Flutter Engine from eb8fac2b1703 to e1259b86ba02 (2 revisions) (flutter/flutter#152285) 2024-07-25 [email protected] Roll Flutter Engine from 4b952093cb99 to eb8fac2b1703 (3 revisions) (flutter/flutter#152278) 2024-07-24 [email protected] [CupertinoAlertDialog] Rewrite (flutter/flutter#150410) 2024-07-24 [email protected] Revert "Make `CupertinoRadio`'s `mouseCursor` a `WidgetStateProperty`" (flutter/flutter#152254) 2024-07-24 [email protected] Fix: A selectable's selection under the active selection should not be cleared on right-click (flutter/flutter#151851) 2024-07-24 [email protected] Marks Mac channels_integration_test to be flaky (flutter/flutter#151882) 2024-07-24 [email protected] Roll Flutter Engine from c2f489d783d6 to 4b952093cb99 (3 revisions) (flutter/flutter#152264) 2024-07-24 [email protected] added Semantics label to TextField with InputDecoration to let user k� (flutter/flutter#151996) 2024-07-24 [email protected] feat: Add alignmentOffset to DropdownMenu (flutter/flutter#151731) 2024-07-24 [email protected] Roll Flutter Engine from 490576daf810 to c2f489d783d6 (6 revisions) (flutter/flutter#152260) 2024-07-24 [email protected] Scaffolding for `NativeDriver` and `AndroidNativeDriver` for taking screenshots using `adb`. (flutter/flutter#152194) 2024-07-24 [email protected] `widgets` docImport (flutter/flutter#152146) 2024-07-24 [email protected] Roll Flutter Engine from 3078f6a90e71 to 490576daf810 (1 revision) (flutter/flutter#152239) 2024-07-24 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Use more CORS headers for `flutter run` server (#152048)" (flutter/flutter#152248) 2024-07-24 [email protected] Use more CORS headers for `flutter run` server (flutter/flutter#152048) 2024-07-24 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Enable Swift Package Manager by default on master channel (#152049)" (flutter/flutter#152243) ...
TytaniumDev
pushed a commit
to TytaniumDev/flutter
that referenced
this pull request
Aug 7, 2024
…re (flutter#152182) Upcoming changes to DDC change the async semantics of code produced by the compiler. The changes will bring the semantics more in line with those of dart2js and fix several bugs in the old semantics. However in landing those changes I experienced a test failure in [obscured_animated_image_test](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/obscured_animated_image_test.dart). Some debugging uncovered that this is due to the use of `SynchronousFuture` in this `FakeCodec`. The old DDC async semantics forced an async gap when that future was [awaited](https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/painting/image_stream.dart#L1064). The new async semantics do not create an async gap here. This changes the render ordering of the widget tree created in the test leading to the test failure. `Future.value` should be a reasonable substitute here and should achieve what the test was trying to achieve while also preserving the correct render ordering given the new DDC semantics.
Buchimi
pushed a commit
to Buchimi/flutter
that referenced
this pull request
Sep 2, 2024
…re (flutter#152182) Upcoming changes to DDC change the async semantics of code produced by the compiler. The changes will bring the semantics more in line with those of dart2js and fix several bugs in the old semantics. However in landing those changes I experienced a test failure in [obscured_animated_image_test](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/obscured_animated_image_test.dart). Some debugging uncovered that this is due to the use of `SynchronousFuture` in this `FakeCodec`. The old DDC async semantics forced an async gap when that future was [awaited](https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/painting/image_stream.dart#L1064). The new async semantics do not create an async gap here. This changes the render ordering of the widget tree created in the test leading to the test failure. `Future.value` should be a reasonable substitute here and should achieve what the test was trying to achieve while also preserving the correct render ordering given the new DDC semantics.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Upcoming changes to DDC change the async semantics of code produced by the compiler. The changes will bring the semantics more in line with those of dart2js and fix several bugs in the old semantics. However in landing those changes I experienced a test failure in obscured_animated_image_test.
Some debugging uncovered that this is due to the use of
SynchronousFuturein thisFakeCodec. The old DDC async semantics forced an async gap when that future was awaited. The new async semantics do not create an async gap here. This changes the render ordering of the widget tree created in the test leading to the test failure.Future.valueshould be a reasonable substitute here and should achieve what the test was trying to achieve while also preserving the correct render ordering given the new DDC semantics.