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WidgetStatesConstraint as a mixin#181704

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nate-thegrate:widget-state-mixin
Feb 26, 2026
Merged

WidgetStatesConstraint as a mixin#181704
auto-submit[bot] merged 2 commits into
flutter:masterfrom
nate-thegrate:widget-state-mixin

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@nate-thegrate

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This PR removes the WidgetStateOperators extension, per the style guide.

Should be a non-breaking change.

@github-actions github-actions Bot added framework flutter/packages/flutter repository. See also f: labels. d: api docs Issues with https://api.flutter.dev/ d: examples Sample code and demos labels Jan 30, 2026
@nate-thegrate nate-thegrate marked this pull request as ready for review January 30, 2026 04:11

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Code Review

This pull request refactors WidgetStatesConstraint from an abstract interface class to a mixin, moving operator logic from the WidgetStateOperators extension directly into the mixin. This change aligns with the Flutter style guide's recommendation to avoid extensions on base types. All implementing classes are updated to use the mixin, and a new test is added to validate the change. The refactoring is well-executed and achieves its goal.

@justinmc

justinmc commented Feb 3, 2026

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@nate-thegrate Would you mind looking up the PR that added this change so we can see why this was done in the first place?

@nate-thegrate

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Here's the PR that added this change:


Originally, I had an abstract interface class and a mixin, and WidgetState was a subtype of both. But it led to these weird Google Testing failures that seemed impossible to debug, so I switched over to extension methods and got everything working.

A few months back I realized that it could have just been a single mixin, which I feel is much better in terms of readability and reducing the amount of types we export in the widgets library.

@loic-sharma

loic-sharma commented Feb 5, 2026

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FYI, I'll be doing a Dash Forum tomorrow that proposes loosing our extension method restrictions: flutter.dev/go/flutter-style-updates.

The new guidance - if accepted - will allow extension methods with guardrails that nudge folks towards instance methods. You can see my draft of the new guidance here: #181934

Anywho, this change looks good to me regardless. Thanks for the contribution!

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LGTM 👍 . Thank you for the explanation and for coming back to clean this up!

Comment thread examples/api/test/widgets/widget_state/widget_state_property.0_test.dart Outdated
@justinmc justinmc added the autosubmit Merge PR when tree becomes green via auto submit App label Feb 25, 2026
@auto-submit auto-submit Bot added this pull request to the merge queue Feb 25, 2026
Merged via the queue into flutter:master with commit 486d116 Feb 26, 2026
73 of 74 checks passed
@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Feb 26, 2026
@nate-thegrate nate-thegrate deleted the widget-state-mixin branch February 26, 2026 02:13
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Feb 26, 2026
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Feb 26, 2026
ahmedsameha1 pushed a commit to ahmedsameha1/flutter that referenced this pull request Feb 27, 2026
This PR removes the `WidgetStateOperators` extension, per the [style
guide](https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md#avoid-using-extension).

Should be a non-breaking change.
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Feb 27, 2026
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Feb 27, 2026
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Feb 27, 2026
Roll Flutter from b31548feb941 to 1141b2bdce66 (56 revisions)

flutter/flutter@b31548f...1141b2b

2026-02-27 maxime.pontoire@me.com flutter#182361 Fix delegate copy on plugins init (flutter/flutter#182362)
2026-02-27 engine-flutter-autoroll@skia.org Roll Dart SDK from 8b036b3e63cb to 1cdb7dfd913e (1 revision) (flutter/flutter#183004)
2026-02-27 vegorov@google.com Manual roll Dart SDK to 3.12.0-192.0.dev (flutter/flutter#182883)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from e2062707b0c0 to ed220c490eea (1 revision) (flutter/flutter#182992)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from e5aa1ab5c59c to e2062707b0c0 (3 revisions) (flutter/flutter#182989)
2026-02-27 oss@simonbinder.eu Linux build hooks: Read compiler config from CMakeCache.txt (flutter/flutter#181004)
2026-02-27 engine-flutter-autoroll@skia.org Roll ICU from a86a32e67b8d to 7971660ba630 (3 revisions) (flutter/flutter#182986)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from 49c2de95384e to e5aa1ab5c59c (2 revisions) (flutter/flutter#182980)
2026-02-27 flar@google.com [Impeller] Remove shared rendering data from TextFrame (flutter/flutter#182886)
2026-02-27 robert.ancell@canonical.com Add fl_view_new_sized_to_content() (flutter/flutter#182924)
2026-02-27 737941+loic-sharma@users.noreply.github.com [Shortcuts] Improve focus node debug labels (flutter/flutter#181834)
2026-02-27 34871572+gmackall@users.noreply.github.com Add a cli flag for toggling HCPP use, and enable it (flutter/flutter#182516)
2026-02-27 nate.w5687@gmail.com `SizedBox.square()` (flutter/flutter#182731)
2026-02-27 1961493+harryterkelsen@users.noreply.github.com [web] Fix stack corruption in Skwasm and harden withStackScope API (flutter/flutter#182912)
2026-02-26 jason-simmons@users.noreply.github.com Roll zlib to 7eda07b1e067 (flutter/flutter#182692)
2026-02-26 bkonyi@google.com [ CI ] Don't crash analysis when ktlint isn't on PATH (flutter/flutter#181854)
2026-02-26 34871572+gmackall@users.noreply.github.com Add calls to await `flutterDriver.waitUntilFirstFrameRasterized()` for all `android_engine_test` screenshot tests (flutter/flutter#182961)
2026-02-26 engine-flutter-autoroll@skia.org Roll Skia from f44d7db68805 to 49c2de95384e (30 revisions) (flutter/flutter#182957)
2026-02-26 robert.ancell@canonical.com Support sending window constraints in metrics events (flutter/flutter#182921)
2026-02-26 34465683+rkishan516@users.noreply.github.com Reland: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182891)
2026-02-26 116356835+AbdeMohlbi@users.noreply.github.com Remove some instances of useMaterial3: true (flutter/flutter#182944)
2026-02-26 serhatguler@hotmail.de [Impeller] Use bilinear filtering for non-uniform scaled text (flutter/flutter#182224)
2026-02-26 chingjun@google.com Add a ResidentCompilerFactory to create ResidentCompiler instances. (flutter/flutter#182930)
2026-02-26 chingjun@google.com Add a getter in run.dart to access use-application-binary flag. (flutter/flutter#182931)
2026-02-26 mdebbar@google.com [web] Roll Firefox to 148 (flutter/flutter#182859)
2026-02-26 engine-flutter-autoroll@skia.org Roll Packages from acd9adb to e1d0169 (8 revisions) (flutter/flutter#182946)
2026-02-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from XI0Ax7fbtYE4XKYAQ... to G1GwOdVt5bM7GjMSY... (flutter/flutter#182942)
2026-02-26 robert.ancell@canonical.com Add test for WindowPositioner.toString (flutter/flutter#182906)
2026-02-26 robert.ancell@canonical.com Remove unused function prototype (flutter/flutter#182915)
2026-02-26 ahmedsameha1@gmail.com Resolve inconsistency with SchedulerBinding.scheduleTask usage recomm… (flutter/flutter#182531)
2026-02-26 51901607+O-Hannonen@users.noreply.github.com Fix false positives for hit test misses in flutter_test (flutter/flutter#180856)
2026-02-26 116356835+AbdeMohlbi@users.noreply.github.com Replace an instance of flutter/engine with flutter/flutter (flutter/flutter#182655)
2026-02-26 146823759+brahim-guaali@users.noreply.github.com Use null-aware elements in widgets/routes.dart (flutter/flutter#181242)
2026-02-26 37593616+itsAdityaRathore@users.noreply.github.com Fix typos in method names across multiple files (flutter/flutter#182584)
2026-02-26 brunocorona.alcantar@gmail.com Fix RawAutocomplete crash when options are hidden (flutter/flutter#182785)
2026-02-26 flar@google.com Describe implications of tree-status and Google Testing for PRs (flutter/flutter#182916)
2026-02-26 ahmedsameha1@gmail.com Make sure that a StretchingOverscrollIndicator doesn't crash when it … (flutter/flutter#182499)
2026-02-26 srawlins@google.com framework: Use a super-parameter in several missed cases (flutter/flutter#182580)
2026-02-25 nate.w5687@gmail.com `WidgetStatesConstraint` as a mixin (flutter/flutter#181704)
2026-02-25 Rusino@users.noreply.github.com Paint the paragraph as a single image (flutter/flutter#181206)
2026-02-25 rmolivares@renzo-olivares.dev Remove `ExtendSelectionByPageIntent` (flutter/flutter#182642)
2026-02-25 34465683+rkishan516@users.noreply.github.com feat: add few required properties to test widgets app (flutter/flutter#182805)
2026-02-25 prbillingsley89@gmail.com Updates MenuAnchor to respect software keyboard (flutter/flutter#180975)
2026-02-25 jason-simmons@users.noreply.github.com Roll ImGui to v1.92.6-docking (flutter/flutter#182799)
2026-02-25 jason-simmons@users.noreply.github.com Roll GoogleTest to e9907112b472 (flutter/flutter#182795)
2026-02-25 Veselblu@yandex.ru Make positionInlineChildren assert much clearer (flutter/flutter#182093)
...
xxxOVALxxx pushed a commit to xxxOVALxxx/flutter that referenced this pull request Mar 10, 2026
This PR removes the `WidgetStateOperators` extension, per the [style
guide](https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md#avoid-using-extension).

Should be a non-breaking change.
okorohelijah pushed a commit to okorohelijah/packages that referenced this pull request Mar 26, 2026
…r#11137)

Roll Flutter from b31548feb941 to 1141b2bdce66 (56 revisions)

flutter/flutter@b31548f...1141b2b

2026-02-27 maxime.pontoire@me.com flutter#182361 Fix delegate copy on plugins init (flutter/flutter#182362)
2026-02-27 engine-flutter-autoroll@skia.org Roll Dart SDK from 8b036b3e63cb to 1cdb7dfd913e (1 revision) (flutter/flutter#183004)
2026-02-27 vegorov@google.com Manual roll Dart SDK to 3.12.0-192.0.dev (flutter/flutter#182883)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from e2062707b0c0 to ed220c490eea (1 revision) (flutter/flutter#182992)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from e5aa1ab5c59c to e2062707b0c0 (3 revisions) (flutter/flutter#182989)
2026-02-27 oss@simonbinder.eu Linux build hooks: Read compiler config from CMakeCache.txt (flutter/flutter#181004)
2026-02-27 engine-flutter-autoroll@skia.org Roll ICU from a86a32e67b8d to 7971660ba630 (3 revisions) (flutter/flutter#182986)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from 49c2de95384e to e5aa1ab5c59c (2 revisions) (flutter/flutter#182980)
2026-02-27 flar@google.com [Impeller] Remove shared rendering data from TextFrame (flutter/flutter#182886)
2026-02-27 robert.ancell@canonical.com Add fl_view_new_sized_to_content() (flutter/flutter#182924)
2026-02-27 737941+loic-sharma@users.noreply.github.com [Shortcuts] Improve focus node debug labels (flutter/flutter#181834)
2026-02-27 34871572+gmackall@users.noreply.github.com Add a cli flag for toggling HCPP use, and enable it (flutter/flutter#182516)
2026-02-27 nate.w5687@gmail.com `SizedBox.square()` (flutter/flutter#182731)
2026-02-27 1961493+harryterkelsen@users.noreply.github.com [web] Fix stack corruption in Skwasm and harden withStackScope API (flutter/flutter#182912)
2026-02-26 jason-simmons@users.noreply.github.com Roll zlib to 7eda07b1e067 (flutter/flutter#182692)
2026-02-26 bkonyi@google.com [ CI ] Don't crash analysis when ktlint isn't on PATH (flutter/flutter#181854)
2026-02-26 34871572+gmackall@users.noreply.github.com Add calls to await `flutterDriver.waitUntilFirstFrameRasterized()` for all `android_engine_test` screenshot tests (flutter/flutter#182961)
2026-02-26 engine-flutter-autoroll@skia.org Roll Skia from f44d7db68805 to 49c2de95384e (30 revisions) (flutter/flutter#182957)
2026-02-26 robert.ancell@canonical.com Support sending window constraints in metrics events (flutter/flutter#182921)
2026-02-26 34465683+rkishan516@users.noreply.github.com Reland: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182891)
2026-02-26 116356835+AbdeMohlbi@users.noreply.github.com Remove some instances of useMaterial3: true (flutter/flutter#182944)
2026-02-26 serhatguler@hotmail.de [Impeller] Use bilinear filtering for non-uniform scaled text (flutter/flutter#182224)
2026-02-26 chingjun@google.com Add a ResidentCompilerFactory to create ResidentCompiler instances. (flutter/flutter#182930)
2026-02-26 chingjun@google.com Add a getter in run.dart to access use-application-binary flag. (flutter/flutter#182931)
2026-02-26 mdebbar@google.com [web] Roll Firefox to 148 (flutter/flutter#182859)
2026-02-26 engine-flutter-autoroll@skia.org Roll Packages from acd9adb to e1d0169 (8 revisions) (flutter/flutter#182946)
2026-02-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from XI0Ax7fbtYE4XKYAQ... to G1GwOdVt5bM7GjMSY... (flutter/flutter#182942)
2026-02-26 robert.ancell@canonical.com Add test for WindowPositioner.toString (flutter/flutter#182906)
2026-02-26 robert.ancell@canonical.com Remove unused function prototype (flutter/flutter#182915)
2026-02-26 ahmedsameha1@gmail.com Resolve inconsistency with SchedulerBinding.scheduleTask usage recomm… (flutter/flutter#182531)
2026-02-26 51901607+O-Hannonen@users.noreply.github.com Fix false positives for hit test misses in flutter_test (flutter/flutter#180856)
2026-02-26 116356835+AbdeMohlbi@users.noreply.github.com Replace an instance of flutter/engine with flutter/flutter (flutter/flutter#182655)
2026-02-26 146823759+brahim-guaali@users.noreply.github.com Use null-aware elements in widgets/routes.dart (flutter/flutter#181242)
2026-02-26 37593616+itsAdityaRathore@users.noreply.github.com Fix typos in method names across multiple files (flutter/flutter#182584)
2026-02-26 brunocorona.alcantar@gmail.com Fix RawAutocomplete crash when options are hidden (flutter/flutter#182785)
2026-02-26 flar@google.com Describe implications of tree-status and Google Testing for PRs (flutter/flutter#182916)
2026-02-26 ahmedsameha1@gmail.com Make sure that a StretchingOverscrollIndicator doesn't crash when it … (flutter/flutter#182499)
2026-02-26 srawlins@google.com framework: Use a super-parameter in several missed cases (flutter/flutter#182580)
2026-02-25 nate.w5687@gmail.com `WidgetStatesConstraint` as a mixin (flutter/flutter#181704)
2026-02-25 Rusino@users.noreply.github.com Paint the paragraph as a single image (flutter/flutter#181206)
2026-02-25 rmolivares@renzo-olivares.dev Remove `ExtendSelectionByPageIntent` (flutter/flutter#182642)
2026-02-25 34465683+rkishan516@users.noreply.github.com feat: add few required properties to test widgets app (flutter/flutter#182805)
2026-02-25 prbillingsley89@gmail.com Updates MenuAnchor to respect software keyboard (flutter/flutter#180975)
2026-02-25 jason-simmons@users.noreply.github.com Roll ImGui to v1.92.6-docking (flutter/flutter#182799)
2026-02-25 jason-simmons@users.noreply.github.com Roll GoogleTest to e9907112b472 (flutter/flutter#182795)
2026-02-25 Veselblu@yandex.ru Make positionInlineChildren assert much clearer (flutter/flutter#182093)
...
mboetger pushed a commit to mboetger/flutter that referenced this pull request Mar 26, 2026
This PR removes the `WidgetStateOperators` extension, per the [style
guide](https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md#avoid-using-extension).

Should be a non-breaking change.
creatorpiyush pushed a commit to creatorpiyush/packages that referenced this pull request Jun 10, 2026
…r#11137)

Roll Flutter from b31548feb941 to 1141b2bdce66 (56 revisions)

flutter/flutter@b31548f...1141b2b

2026-02-27 maxime.pontoire@me.com flutter#182361 Fix delegate copy on plugins init (flutter/flutter#182362)
2026-02-27 engine-flutter-autoroll@skia.org Roll Dart SDK from 8b036b3e63cb to 1cdb7dfd913e (1 revision) (flutter/flutter#183004)
2026-02-27 vegorov@google.com Manual roll Dart SDK to 3.12.0-192.0.dev (flutter/flutter#182883)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from e2062707b0c0 to ed220c490eea (1 revision) (flutter/flutter#182992)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from e5aa1ab5c59c to e2062707b0c0 (3 revisions) (flutter/flutter#182989)
2026-02-27 oss@simonbinder.eu Linux build hooks: Read compiler config from CMakeCache.txt (flutter/flutter#181004)
2026-02-27 engine-flutter-autoroll@skia.org Roll ICU from a86a32e67b8d to 7971660ba630 (3 revisions) (flutter/flutter#182986)
2026-02-27 engine-flutter-autoroll@skia.org Roll Skia from 49c2de95384e to e5aa1ab5c59c (2 revisions) (flutter/flutter#182980)
2026-02-27 flar@google.com [Impeller] Remove shared rendering data from TextFrame (flutter/flutter#182886)
2026-02-27 robert.ancell@canonical.com Add fl_view_new_sized_to_content() (flutter/flutter#182924)
2026-02-27 737941+loic-sharma@users.noreply.github.com [Shortcuts] Improve focus node debug labels (flutter/flutter#181834)
2026-02-27 34871572+gmackall@users.noreply.github.com Add a cli flag for toggling HCPP use, and enable it (flutter/flutter#182516)
2026-02-27 nate.w5687@gmail.com `SizedBox.square()` (flutter/flutter#182731)
2026-02-27 1961493+harryterkelsen@users.noreply.github.com [web] Fix stack corruption in Skwasm and harden withStackScope API (flutter/flutter#182912)
2026-02-26 jason-simmons@users.noreply.github.com Roll zlib to 7eda07b1e067 (flutter/flutter#182692)
2026-02-26 bkonyi@google.com [ CI ] Don't crash analysis when ktlint isn't on PATH (flutter/flutter#181854)
2026-02-26 34871572+gmackall@users.noreply.github.com Add calls to await `flutterDriver.waitUntilFirstFrameRasterized()` for all `android_engine_test` screenshot tests (flutter/flutter#182961)
2026-02-26 engine-flutter-autoroll@skia.org Roll Skia from f44d7db68805 to 49c2de95384e (30 revisions) (flutter/flutter#182957)
2026-02-26 robert.ancell@canonical.com Support sending window constraints in metrics events (flutter/flutter#182921)
2026-02-26 34465683+rkishan516@users.noreply.github.com Reland: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182891)
2026-02-26 116356835+AbdeMohlbi@users.noreply.github.com Remove some instances of useMaterial3: true (flutter/flutter#182944)
2026-02-26 serhatguler@hotmail.de [Impeller] Use bilinear filtering for non-uniform scaled text (flutter/flutter#182224)
2026-02-26 chingjun@google.com Add a ResidentCompilerFactory to create ResidentCompiler instances. (flutter/flutter#182930)
2026-02-26 chingjun@google.com Add a getter in run.dart to access use-application-binary flag. (flutter/flutter#182931)
2026-02-26 mdebbar@google.com [web] Roll Firefox to 148 (flutter/flutter#182859)
2026-02-26 engine-flutter-autoroll@skia.org Roll Packages from acd9adb to e1d0169 (8 revisions) (flutter/flutter#182946)
2026-02-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from XI0Ax7fbtYE4XKYAQ... to G1GwOdVt5bM7GjMSY... (flutter/flutter#182942)
2026-02-26 robert.ancell@canonical.com Add test for WindowPositioner.toString (flutter/flutter#182906)
2026-02-26 robert.ancell@canonical.com Remove unused function prototype (flutter/flutter#182915)
2026-02-26 ahmedsameha1@gmail.com Resolve inconsistency with SchedulerBinding.scheduleTask usage recomm… (flutter/flutter#182531)
2026-02-26 51901607+O-Hannonen@users.noreply.github.com Fix false positives for hit test misses in flutter_test (flutter/flutter#180856)
2026-02-26 116356835+AbdeMohlbi@users.noreply.github.com Replace an instance of flutter/engine with flutter/flutter (flutter/flutter#182655)
2026-02-26 146823759+brahim-guaali@users.noreply.github.com Use null-aware elements in widgets/routes.dart (flutter/flutter#181242)
2026-02-26 37593616+itsAdityaRathore@users.noreply.github.com Fix typos in method names across multiple files (flutter/flutter#182584)
2026-02-26 brunocorona.alcantar@gmail.com Fix RawAutocomplete crash when options are hidden (flutter/flutter#182785)
2026-02-26 flar@google.com Describe implications of tree-status and Google Testing for PRs (flutter/flutter#182916)
2026-02-26 ahmedsameha1@gmail.com Make sure that a StretchingOverscrollIndicator doesn't crash when it … (flutter/flutter#182499)
2026-02-26 srawlins@google.com framework: Use a super-parameter in several missed cases (flutter/flutter#182580)
2026-02-25 nate.w5687@gmail.com `WidgetStatesConstraint` as a mixin (flutter/flutter#181704)
2026-02-25 Rusino@users.noreply.github.com Paint the paragraph as a single image (flutter/flutter#181206)
2026-02-25 rmolivares@renzo-olivares.dev Remove `ExtendSelectionByPageIntent` (flutter/flutter#182642)
2026-02-25 34465683+rkishan516@users.noreply.github.com feat: add few required properties to test widgets app (flutter/flutter#182805)
2026-02-25 prbillingsley89@gmail.com Updates MenuAnchor to respect software keyboard (flutter/flutter#180975)
2026-02-25 jason-simmons@users.noreply.github.com Roll ImGui to v1.92.6-docking (flutter/flutter#182799)
2026-02-25 jason-simmons@users.noreply.github.com Roll GoogleTest to e9907112b472 (flutter/flutter#182795)
2026-02-25 Veselblu@yandex.ru Make positionInlineChildren assert much clearer (flutter/flutter#182093)
...
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