FadeForwards page transition performance by justinmc · Pull Request #13161 · flutter/packages

justinmc · 2026-10-07T23:34:11Z

There's an old performance regression (flutter/flutter#177016) that happened when we changed the default Android page transition to FadeForwards from Zoom. I dismissed it as minor at first, but I think the root problem is that Zoom snapshots itself and FadeForwards doesn't. This PR adds snapshotting to FadeForwards and achieves a 37% speedup on my Pixel 9.

Zoom (old)	FadeForwards (new)

Benchmarking results

Snapshotting reduced raster time by 37% for my Pixel 9 (Impeller on Vulkan) and 22% for my Pixel 2XL (Impeller on OpenGL ES). I ran the transitions_perf test with the following command:

flutter drive --profile --trace-startup -t test_driver/transitions_perf.dart

Pixel 9 raster (ms)	baseline (master)	snapshot	snapshot off
avg	2.61 [2.45–2.67]	1.64 [1.49–1.67] (−37%)	2.68
p90	3.91 [3.77–3.95]	2.99 [2.75–3.01] (−24%)	3.95
p99	8.00 [7.45–8.16]	5.70 [5.53–5.74] (−29%)	7.62
worst	33.2 [29.3–38.2]	19.3 [17.5–21.0] (−42%)	29.6
missed raster budget	8.5	2.5	12
total raster ms	10,460	6,591 (−37%)	10,696

Pixel 2 XL raster time (ms)	baseline (master)	snapshot	snapshot_off
avg	15.6 [15.0–16.0]	12.3 [12.1–12.6] (−22%)	15.6
p90	20.4 [20.0–20.7]	18.6 [18.4–18.8] (−9%)	20.5
p99	68.6 [67.6–71.3]	35.5 [35.1–36.1] (−48%)	70.6
worst	103 [100–109]	44 [41–45] (−57%)	104
missed raster budget	777	543 (−30%)	759
frames rendered	1863	1967 (+6%)	1859
total raster ms	29,056	24,223 (−17%)	28,885

Fixes flutter/flutter#177016

gemini-code-assist

Code Review

This pull request introduces snapshotting to FadeForwardsPageTransitionsBuilder to improve performance during page transitions by rendering a snapshot of the entering and exiting routes instead of the live child. It adds the allowSnapshotting property to control this behavior and includes corresponding tests. A critical issue was identified where widget.animation.isAnimating is used, which will cause a compilation error because the Animation class does not have an isAnimating property. The reviewer suggested checking the animation status instead.

gemini-code-assist · 2026-10-08T22:43:54Z

+  }
+
+  void _updateSnapshotting() {
+    _controller.allowSnapshotting = _useSnapshot && widget.animation.isAnimating;


The Animation class does not have an isAnimating property. Using widget.animation.isAnimating will result in a compilation error. Instead, you should check if the animation status is currently forward or reverse.

_controller.allowSnapshotting = _useSnapshot && (widget.animation.status == AnimationStatus.forward || widget.animation.status == AnimationStatus.reverse);

Animation.isAnimating does indeed exist https://api.flutter.dev/flutter/animation/Animation/isAnimating.html

Renzo-Olivares

LGTM overall! Nice find regarding snapshotting in the zoom transition.

Just left a couple of non-blocking questions/nits.

Renzo-Olivares · 2026-10-08T23:52:16Z

+// This means that animations inside of the child (e.g. ink splashes or
+// progress indicators) are frozen for the duration of the transition, which is
+// the same tradeoff made by [ZoomPageTransitionsBuilder]. If the child contains
+// a platform view, the live child is painted instead (see
+// [SnapshotMode.permissive]).


nit: It might be worth mentioning this tradeoff in the public dartdoc on FadeForwardsPageTransitionsBuilder as well (and linking to [PageRoute.allowSnapshotting] in its See also: section, similar to ZoomPageTransitionsBuilder), so developers who notice frozen ink splashes or progress indicators during transitions know why it happens and how to opt out.

Renzo-Olivares · 2026-10-08T23:52:16Z

+      allowSnapshotting:
+          !ZoomPageTransitionsBuilder._kProfileForceDisableSnapshotting &&
+          (route?.allowSnapshotting ?? true),


ZoomPageTransitionsBuilder also exposes allowSnapshotting (and allowEnterRouteSnapshotting) on the builder itself so users can opt out globally at the PageTransitionsTheme level without setting allowSnapshotting: false on every PageRoute (e.g., flutter/flutter#122019 / flutter/flutter#118086).

Do we want to keep FadeForwardsPageTransitionsBuilder (and PredictiveBackPageTransitionsBuilder) without those parameters for now to avoid expanding the public API surface until requested, or should we add allowSnapshotting = true for parity?

Ok I added both allowSnapshotting and allowEnterRouteSnapshotting to both FadeForwardsPageTransitionsBuilder and PredictiveBackPageTransitionsBuilder for parity. The double-boolean API is not great as I mentioned in another comment, but I feel like any breaking cleanup should be done separately, at which point we might as well clean up both, rather than choosing a different API here.

I'm assuming that these two parameters are useful based on the Zoom transition and PR flutter/flutter#118086 which added the "EnterRoute" one. I'm interested in what you think though @Renzo-Olivares .

I'm assuming that these two parameters are useful based on the Zoom transition and PR flutter/flutter#118086 which added the "EnterRoute" one. I'm interested in what you think though @Renzo-Olivares .

Yeah that was my thinking as well. One interesting caveat is that allowEnterRouteSnapshotting is not being used internally at the moment so the original use-case that motivated that API is no longer present. I wouldn't be opposed to deferring allowEnterRouteSnapshotting until requested and going with only allowSnapshotting.

Ah you're right about the internal use being gone. I'll omit it on FadeForwards for now.

gaaclarke

Nice, thanks for following up. I just have a few questions.

gaaclarke · 2026-10-09T22:13:59Z

+  /// See also:
+  ///
+  ///  * [_allowSnapshotting], which is the same but for both routes.
+  final bool _allowEnterRouteSnapshotting;


Do we really need this fine level of control? Is _allowSnapshotting sufficient?

I almost omitted this, but I decided to include it since ZoomPageTransition has it. It was added in flutter/flutter#118086. @Renzo-Olivares do you have any thoughts?

Wrote a reply https://github.com/flutter/packages/pull/13161/changes/BASE..2fb11b9332031d09baf4b19bc208bd0a6690a11e#r4262631515 . But generally i'd be okay with deferring allowEnterRouteSnapshotting until requested/needed.

gaaclarke · 2026-10-09T22:14:25Z

+  /// not be snapshotted.
+  /// See also:
+  ///
+  ///  * [_allowSnapshotting], which is the same but for both routes.


It's worth mentioning the logic used since they are AND'd which isn't clear from the API.

gaaclarke · 2026-10-09T22:16:14Z

+  ///    transition.
+  ///  * [_allowEnterRouteSnapshotting], which is the same but only for the
+  ///    entering route.
+  final bool _allowSnapshotting;


The word "allow" is not a definitive command, should this be "_useSnapshotting"?

I agree this is not the best API, but I'm mirroring the existing ZoomPageTransitionBuilder.allowSnapshotting. The fact that there are 2 booleans that kind of overlap in scope also bothers me a bit (allowEnterRouteSnapshotting).

Since it would be a breaking change to rename the existing allowSnapshotting, I think we should probably use the same name for now, and if we ever get around to making the breaking change, we should rename them both at the same time in the future.

Renzo-Olivares · 2026-10-13T18:44:01Z

+      allowSnapshotting:
+          !ZoomPageTransitionsBuilder._kProfileForceDisableSnapshotting &&
+          (route?.allowSnapshotting ?? true),


I'm assuming that these two parameters are useful based on the Zoom transition and PR flutter/flutter#118086 which added the "EnterRoute" one. I'm interested in what you think though @Renzo-Olivares .

Yeah that was my thinking as well. One interesting caveat is that allowEnterRouteSnapshotting is not being used internally at the moment so the original use-case that motivated that API is no longer present. I wouldn't be opposed to deferring allowEnterRouteSnapshotting until requested and going with only allowSnapshotting.

Renzo-Olivares · 2026-10-13T18:45:09Z

+  /// See also:
+  ///
+  ///  * [_allowSnapshotting], which is the same but for both routes.
+  final bool _allowEnterRouteSnapshotting;


Wrote a reply https://github.com/flutter/packages/pull/13161/changes/BASE..2fb11b9332031d09baf4b19bc208bd0a6690a11e#r4262631515 . But generally i'd be okay with deferring allowEnterRouteSnapshotting until requested/needed.

Renzo-Olivares · 2026-10-13T19:02:15Z

  const _FadeForwardsPageTransition({
    required this.animation,
    required this.secondaryAnimation,
+    required this._allowSnapshotting,


Any reason that these are private named parameters instead of public. I don't really have a preference but I think dart docs are not generated for private named parameters so things like hovering over this._allowSnapshotting would not display any relevant dart docs.

I will make them public in this PR but then start a discussion about this. I was so excited to use this language feature to make private properties, but you're right about the docs. I made an effort to document the parameters in the constructor, but we should make an official decision here about whether we want to do that or keep things as they are.

Roll Packages from a1ed23c to da40eaf (33 revisions) flutter/packages@a1ed23c...da40eaf 2026-10-15 tarrinneal@gmail.com [pigeon]add support for sealed classes in native interop (flutter/packages#13175) 2026-10-15 tarrinneal@gmail.com [pigeon] Replace full JNI bindings with stubs for API classes that aren't needed (flutter/packages#13173) 2026-10-14 ksanaullah383.khan@gmail.com [material_ui] Fix self-comparison and assert bugs in semantics_tester (flutter/packages#12722) 2026-10-14 magder@google.com [camera_avfoundation] Replace the deprecated 'videoOrientation' with 'videoRotationAngle' on iOS 17+ (flutter/packages#13247) 2026-10-14 zengyan@88.com [material_ui] Fix GridTile crash when the incoming constraints are unbounded (flutter/packages#12586) 2026-10-14 magder@google.com [in_app_purchase_storekit] Remove unused and deprecated "SKDownload" hosted content (flutter/packages#13222) 2026-10-14 55765052+MohanadAbdallah-mv@users.noreply.github.com [material_ui] Add supportingTextPadding to InputDecorator (flutter/packages#12769) 2026-10-14 37883572+edwin-hollen@users.noreply.github.com [vector_graphics_codec] Add support for encoding and decoding paint blur commands (flutter/packages#13148) 2026-10-14 ketulm8@gmail.com [go_router] Fix redirect zone async error handling (flutter/packages#12836) 2026-10-14 fluttergithubbot@gmail.com Sync release-go_router-18.1.0 to main (flutter/packages#13260) 2026-10-14 fluttergithubbot@gmail.com Sync release-cupertino_ui-1.1.3 to main (flutter/packages#13258) 2026-10-14 lsaudon@gmail.com [material_ui] add enableInlinePrediction parameter to TextFormField (flutter/packages#12793) 2026-10-14 fluttergithubbot@gmail.com Sync release-material_ui-1.7.0 to main (flutter/packages#13259) 2026-10-14 sokolovskyi.konstantin@gmail.com [material_ui] Add the Material shapes. (flutter/packages#12771) 2026-10-14 64028623+Ahtsham0715@users.noreply.github.com [material_ui] Add tertiary tap callbacks to InkResponse and InkWell (flutter/packages#12676) 2026-10-14 engine-flutter-autoroll@skia.org Roll Flutter from 4249ccb to 426be96 (44 revisions) (flutter/packages#13256) 2026-10-14 47866232+chunhtai@users.noreply.github.com [material_ui] fixes expanded state in the a11y_assessment home page dropdown (flutter/packages#13219) 2026-10-14 zhongliu88889@gmail.com [VPAT] Fix semantics in a11y_assessments drawer, radio, and rail demos (flutter/packages#13159) 2026-10-14 5684363+tenninebt@users.noreply.github.com [google_maps_flutter] Add onPointOfInterestTap (flutter/packages#11872) 2026-10-14 Gornivv@gmail.com [go_router] Fix shell route key collisions and dynamic branch updates (flutter/packages#12549) 2026-10-14 engine-flutter-autoroll@skia.org Manual roll Flutter from d03768e to 4249ccb (158 revisions) (flutter/packages#13220) 2026-10-14 okorohelijah@google.com [image_picker_ios] Require Flutter 3.47 / iOS 15 and drop deprecated kUTType code paths (flutter/packages#13224) 2026-10-13 louisehsu@google.com [in_app_purchase_storekit] Fixes Storekit 2 flaky tests (flutter/packages#13213) 2026-10-13 stuartmorgan@google.com [local_auth] Convert Android to new Pigeon suspend support (flutter/packages#12894) 2026-10-13 50643541+Mairramer@users.noreply.github.com [material_ui] Add enabled parameter to DropdownButtonFormField (flutter/packages#12610) 2026-10-13 molchanovia.dev@gmail.com [go_router] Link ShellRoute docs to StatefulShellRoute (flutter/packages#13120) 2026-10-13 jmccandless@google.com FadeForwards page transition performance (flutter/packages#13161) 2026-10-13 101952451+eszter-varga@users.noreply.github.com [in_app_purchase_android] Guard async billing callbacks against duplicate listener responses (flutter/packages#12640) 2026-10-13 victor.orozco@cloudsufi.com [google_sign_in] Remove the Objective-C exception catcher (flutter/packages#13156) 2026-10-13 magder@google.com [camera_avfoundation] Remove availability checks below the package minimum iOS 13 (flutter/packages#13214) 2026-10-13 magder@google.com [google_maps_flutter_ios] Remove iOS 14 availability check from example UI tests (flutter/packages#13218) 2026-10-13 stuartmorgan@google.com [google_sign_in] Convert implementation to Kotlin (flutter/packages#13005) 2026-10-13 victor.orozco@cloudsufi.com [image_picker_ios] PR 2/5 Add a PHImageManager image-data seam and migrate plugin native tests to Swift Testing (flutter/packages#13079) If this roll has caused a breakage, revert this CL and set the roller to dry run mode using the controls here: https://autoroll.skia.org/r/flutter-packages-flutter-autoroll Please CC flutter-ecosystem@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: 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: ...

`material_ui` 1.8.0 (flutter/packages#13161) enabled route-transition raster snapshotting ([`allowSnapshotting = true`](https://github.com/flutter/packages/blob/623479c2ee9209316460eafb3f3cff61367127a0/packages/material_ui/lib/src/page_transitions_theme.dart#L590-L607)) in `FadeForwardsPageTransitionsBuilder`, causing `game_widget_lifecycle_test.dart` in `flame.test` to fail because `SnapshotWidget` reuses the cached route raster instead of calling `GameRenderBox.paint` a second time during the transition. Example CI failures: - https://ci.chromium.org/b/8667404745333857041 - https://ci.chromium.org/b/8667406041351366033 This temporarily disables `flame.test` to unblock the `flutter/flutter` tree while flame-engine/flame#4125 lands. Part of flutter/flutter#194883

Rolls `flutter/tests` to flutter/tests#508 (`1732eab79f73fe0b9b6ead6030437c74bebd1b2e`), which temporarily disables `registry/flame.test` after `material_ui` 1.8.0 (flutter/packages#13161) enabled route-transition raster snapshotting in `FadeForwardsPageTransitionsBuilder`. Example CI failures: - https://ci.chromium.org/b/8667404745333857041 - https://ci.chromium.org/b/8667406041351366033 Part of flutter#194883

`material_ui` 1.8.0 (flutter/packages#13161) enabled route-transition raster snapshotting ([`allowSnapshotting = true`](https://github.com/flutter/packages/blob/623479c2ee9209316460eafb3f3cff61367127a0/packages/material_ui/lib/src/page_transitions_theme.dart#L590-L607)) in `FadeForwardsPageTransitionsBuilder` on Android, matching `ZoomPageTransitionsBuilder`. In `game_widget_lifecycle_test.dart`, when `tester.tap(find.text('Play'))` pumps a second frame 16ms into the `/game` route transition, `SnapshotWidget` reuses the raster snapshot captured on the first transition frame instead of calling `GameRenderBox.paint` a second time. Example CI failures: - https://ci.chromium.org/b/8667404745333857041 - https://ci.chromium.org/b/8667406041351366033 This disables route-transition snapshotting via `FadeForwardsPageTransitionsBuilder(allowSnapshotting: false)` in `_MyApp` so the game continues rendering live during the transition. Part of flutter/flutter#194883 --------- Co-authored-by: Lukas Klingsbo <me@lukas.fyi>

Rolls `flutter/tests` to flutter/tests#508 (`1732eab79f73fe0b9b6ead6030437c74bebd1b2e`), which temporarily disables `registry/flame.test` after `material_ui` 1.8.0 (flutter/packages#13161) enabled route-transition raster snapshotting in `FadeForwardsPageTransitionsBuilder`. Example CI failures: - https://ci.chromium.org/b/8667404745333857041 - https://ci.chromium.org/b/8667406041351366033 Part of flutter#194883

Roll Packages from a1ed23c to da40eaf (33 revisions) flutter/packages@a1ed23c...da40eaf 2026-10-15 tarrinneal@gmail.com [pigeon]add support for sealed classes in native interop (flutter/packages#13175) 2026-10-15 tarrinneal@gmail.com [pigeon] Replace full JNI bindings with stubs for API classes that aren't needed (flutter/packages#13173) 2026-10-14 ksanaullah383.khan@gmail.com [material_ui] Fix self-comparison and assert bugs in semantics_tester (flutter/packages#12722) 2026-10-14 magder@google.com [camera_avfoundation] Replace the deprecated 'videoOrientation' with 'videoRotationAngle' on iOS 17+ (flutter/packages#13247) 2026-10-14 zengyan@88.com [material_ui] Fix GridTile crash when the incoming constraints are unbounded (flutter/packages#12586) 2026-10-14 magder@google.com [in_app_purchase_storekit] Remove unused and deprecated "SKDownload" hosted content (flutter/packages#13222) 2026-10-14 55765052+MohanadAbdallah-mv@users.noreply.github.com [material_ui] Add supportingTextPadding to InputDecorator (flutter/packages#12769) 2026-10-14 37883572+edwin-hollen@users.noreply.github.com [vector_graphics_codec] Add support for encoding and decoding paint blur commands (flutter/packages#13148) 2026-10-14 ketulm8@gmail.com [go_router] Fix redirect zone async error handling (flutter/packages#12836) 2026-10-14 fluttergithubbot@gmail.com Sync release-go_router-18.1.0 to main (flutter/packages#13260) 2026-10-14 fluttergithubbot@gmail.com Sync release-cupertino_ui-1.1.3 to main (flutter/packages#13258) 2026-10-14 lsaudon@gmail.com [material_ui] add enableInlinePrediction parameter to TextFormField (flutter/packages#12793) 2026-10-14 fluttergithubbot@gmail.com Sync release-material_ui-1.7.0 to main (flutter/packages#13259) 2026-10-14 sokolovskyi.konstantin@gmail.com [material_ui] Add the Material shapes. (flutter/packages#12771) 2026-10-14 64028623+Ahtsham0715@users.noreply.github.com [material_ui] Add tertiary tap callbacks to InkResponse and InkWell (flutter/packages#12676) 2026-10-14 engine-flutter-autoroll@skia.org Roll Flutter from 4249ccb to 426be96 (44 revisions) (flutter/packages#13256) 2026-10-14 47866232+chunhtai@users.noreply.github.com [material_ui] fixes expanded state in the a11y_assessment home page dropdown (flutter/packages#13219) 2026-10-14 zhongliu88889@gmail.com [VPAT] Fix semantics in a11y_assessments drawer, radio, and rail demos (flutter/packages#13159) 2026-10-14 5684363+tenninebt@users.noreply.github.com [google_maps_flutter] Add onPointOfInterestTap (flutter/packages#11872) 2026-10-14 Gornivv@gmail.com [go_router] Fix shell route key collisions and dynamic branch updates (flutter/packages#12549) 2026-10-14 engine-flutter-autoroll@skia.org Manual roll Flutter from d03768e to 4249ccb (158 revisions) (flutter/packages#13220) 2026-10-14 okorohelijah@google.com [image_picker_ios] Require Flutter 3.47 / iOS 15 and drop deprecated kUTType code paths (flutter/packages#13224) 2026-10-13 louisehsu@google.com [in_app_purchase_storekit] Fixes Storekit 2 flaky tests (flutter/packages#13213) 2026-10-13 stuartmorgan@google.com [local_auth] Convert Android to new Pigeon suspend support (flutter/packages#12894) 2026-10-13 50643541+Mairramer@users.noreply.github.com [material_ui] Add enabled parameter to DropdownButtonFormField (flutter/packages#12610) 2026-10-13 molchanovia.dev@gmail.com [go_router] Link ShellRoute docs to StatefulShellRoute (flutter/packages#13120) 2026-10-13 jmccandless@google.com FadeForwards page transition performance (flutter/packages#13161) 2026-10-13 101952451+eszter-varga@users.noreply.github.com [in_app_purchase_android] Guard async billing callbacks against duplicate listener responses (flutter/packages#12640) 2026-10-13 victor.orozco@cloudsufi.com [google_sign_in] Remove the Objective-C exception catcher (flutter/packages#13156) 2026-10-13 magder@google.com [camera_avfoundation] Remove availability checks below the package minimum iOS 13 (flutter/packages#13214) 2026-10-13 magder@google.com [google_maps_flutter_ios] Remove iOS 14 availability check from example UI tests (flutter/packages#13218) 2026-10-13 stuartmorgan@google.com [google_sign_in] Convert implementation to Kotlin (flutter/packages#13005) 2026-10-13 victor.orozco@cloudsufi.com [image_picker_ios] PR 2/5 Add a PHImageManager image-data seam and migrate plugin native tests to Swift Testing (flutter/packages#13079) If this roll has caused a breakage, revert this CL and set the roller to dry run mode using the controls here: https://autoroll.skia.org/r/flutter-packages-flutter-autoroll Please CC flutter-ecosystem@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: 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: ...

Rolls `flutter/tests` to flutter/tests#508 (`1732eab79f73fe0b9b6ead6030437c74bebd1b2e`), which temporarily disables `registry/flame.test` after `material_ui` 1.8.0 (flutter/packages#13161) enabled route-transition raster snapshotting in `FadeForwardsPageTransitionsBuilder`. Example CI failures: - https://ci.chromium.org/b/8667404745333857041 - https://ci.chromium.org/b/8667406041351366033 Part of flutter#194883

Snapshot pages during FadeForwards page transitions

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justinmc self-assigned this Oct 7, 2026

github-actions Bot added p: material_ui triage-design Should be looked at in design triage labels Oct 7, 2026

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justinmc added 2 commits October 8, 2026 15:12

forwardBuilder should be snapshotted too!

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No absolute page transition durations in tests.

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justinmc requested review from Renzo-Olivares and gaaclarke October 8, 2026 22:37

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Formatting.

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Changelog entry

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WIP add and pass through top level useSnapshotting parmeters

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allowSnapshotting and allowEnterRouteSnapshotting for fade forwards

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Tests for new allowSnapshotting and allowNextRouteSnapshotting

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Docs and formatting

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allowSnapshotting in PredictiveBack transition

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Tests for Predictive back params

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justinmc requested a review from Renzo-Olivares October 9, 2026 23:53

Explain logic of two allow parameters.

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No allowEnter

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No private properties for now

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This was referenced Oct 14, 2026

Roll Packages from a1ed23c8f760 to ac2db9cfeaf6 (12 revisions) flutter/flutter#194387

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Roll Packages from a1ed23c8f760 to da40eaf4548a (33 revisions) flutter/flutter#194459

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mdebbar mentioned this pull request Oct 20, 2026

Bump customer_testing to temporarily disable flame.test flutter/flutter#194886

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