Add an initial "Using feature flags" doc for the team. #170767
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| - **Allow experimental access** to features not ready for broad or unguarded | ||
| use. | ||
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| We do not consider it a breaking change to modify or remove experimental flags |
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We do not consider changes guarded by experimental flags to be breaking either. These features are experimental - we are seeking feedback.
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+1, this is a major point that I hope our users will be aware of. The APIs guarded by a feature flag can change at any time and any breakages caused will not be treated as a breaking change.
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Also as a nit on the wording here, I think removing an experimental flag could be a breaking change in the context of launching a feature and removing its experimental status and thus the flag. I agree that removing a flag and its feature should not be considered breaking.
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Done, tweaked language - PTAL.
jtmcdole
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Jun 17, 2025
| ); | ||
| ``` | ||
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| ### Removing a flag |
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Do we want to have guidance around the lifetime of the flag:
- File an issue describing the flagged experiment
- Track when the flags are getting promoted (maybe labels that we could automate)
- Track when a flag should be removed
Its also a place for any reports to link back to if they are filed.
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We don't have that process today, so I'd prefer not to write about a process that doesn't exist.
(This doc is intending to reflect the current state)
In general +1 having such a process, let's just not conflate it with this code review :)
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LGTM 👍 A bunch of nits and a few questions but overall this looks great. Thanks for writing a guide for this.
docs/contributing/Feature-flags.md
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| Feature flags allow conditionally, consistently, and covenentiantly change | ||
| behavior. |
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I think a word is missing here.
Also, spelling on "conveniently".
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Tweaked, I meant changing.
| - **Allow experimental access** to features not ready for broad or unguarded | ||
| use. | ||
|
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| We do not consider it a breaking change to modify or remove experimental flags |
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+1, this is a major point that I hope our users will be aware of. The APIs guarded by a feature flag can change at any time and any breakages caused will not be treated as a breaking change.
| - **Allow experimental access** to features not ready for broad or unguarded | ||
| use. | ||
|
|
||
| We do not consider it a breaking change to modify or remove experimental flags |
Contributor
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Also as a nit on the wording here, I think removing an experimental flag could be a breaking change in the context of launching a feature and removing its experimental status and thus the flag. I agree that removing a flag and its feature should not be considered breaking.
docs/contributing/Feature-flags.md
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| Additional parameters are required to make the flag configurable outside of | ||
| a unit test. |
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What is this in reference to? Is it really possible to use a feature flag in a unit test without using flutter config or pubspec.yaml?
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Ok I see it in the next section. Maybe reference the next section here? Not necessary, though.
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Added a (#tests) link to make it a bit more clear.
docs/contributing/Feature-flags.md
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| } | ||
| ``` | ||
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| 1. Add an implement the same getter in [`FlutterFeatureFlagsIsEnabled`][]: |
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Changed to just Implement the...
docs/contributing/Feature-flags.md
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| Once a flag is ready to be enabled by default, once again it can be configured | ||
| on a per-channel basis. | ||
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| For example, enabled on `master` by default, but disabled elsewhere: |
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Nit: "disabled elsewhere" => "disabled by default elsewhere"
docs/contributing/Feature-flags.md
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| refactored and removed from the codebase, and there is less of a possibility of | ||
| conflicting flags. | ||
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| To a remove a flag, follow the opposite steps of |
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| class WebDevices extends PollingDeviceDiscovery { | ||
| WebDevices({required FeatureFlags featureFlags}) : _featureFlags = featureFlags; |
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Is this example intending to show that WebDevices itself is the new experimental user-facing feature, and any user wanting to use it needs to use the "globals" pattern mentioned below in order to pass in FeatureFlags? If the feature flag is off then WebDevices does nothing?
Or maybe I'm thrown off by this being in the tool.
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No, the intent is that larger-scoped features (like discovery of web devices) might be better suited to take a FeatureFlags instance instead of relying on the global scope. I can make that a bit more clear.
docs/contributing/Feature-flags.md
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| ### Tool | ||
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| Feature flags can be accessed either by adding (and providing) an explicit |
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Nit: Maybe be redundant here and say "In the Flutter tool, feature flags...". I'm thinking to avoid people skimming this and copying this code to the wrong place.
Same for below in the framework section.
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I am going to submit this as a draft, and get that |
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Roll Flutter from 8303a96a0a99 to 85a9b4f38906 (93 revisions) flutter/flutter@8303a96...85a9b4f 2025-06-19 [email protected] Roll Skia from af242598f14d to 794936b23812 (2 revisions) (flutter/flutter#170875) 2025-06-19 [email protected] Drop support for 21/22 Lollipop (flutter/flutter#170748) 2025-06-19 [email protected] Roll Dart SDK from 6020126c10e8 to bce9abe03175 (1 revision) (flutter/flutter#170872) 2025-06-19 [email protected] Roll Skia from df97f7f407db to af242598f14d (4 revisions) (flutter/flutter#170867) 2025-06-19 [email protected] Roll Skia from 1d8f7ebd23cc to df97f7f407db (5 revisions) (flutter/flutter#170864) 2025-06-19 [email protected] Roll Dart SDK from 4ab716b09e9d to 6020126c10e8 (1 revision) (flutter/flutter#170862) 2025-06-19 [email protected] Roll Skia from 291d41414fa7 to 1d8f7ebd23cc (2 revisions) (flutter/flutter#170857) 2025-06-19 [email protected] Roll Dart SDK from b32559bca3cc to 4ab716b09e9d (9 revisions) (flutter/flutter#170855) 2025-06-19 [email protected] remove --start-paused flag by default and set useDwdsWebSocketConnect… (flutter/flutter#170612) 2025-06-18 [email protected] Engine builders no longer require `is_fusion` (flutter/flutter#170849) 2025-06-18 [email protected] Roll Skia from 5f110d5f48a3 to 291d41414fa7 (2 revisions) (flutter/flutter#170836) 2025-06-18 [email protected] Use a shared vertex buffer for rendering layers. (flutter/flutter#170717) 2025-06-18 [email protected] fixes deeplinking in uiscenedelegate migrated projects (flutter/flutter#170452) 2025-06-18 [email protected] [Impeller] fix array uniforms on GLES backend. (flutter/flutter#170710) 2025-06-18 [email protected] [Impeller] Update README to add section about custom embedders. (flutter/flutter#170077) 2025-06-18 [email protected] Escape the forbidden strings in the regex used to check test command output (flutter/flutter#170702) 2025-06-18 [email protected] License cpp jun16 (flutter/flutter#170716) 2025-06-18 [email protected] Work around newer compilers requiring the satisfaction of three-way comparison of EncodableValue. (flutter/flutter#170822) 2025-06-18 [email protected] Update didUnmountRenderObject text description (flutter/flutter#169628) 2025-06-18 [email protected] Roll Skia from 297dbc32a6c7 to 5f110d5f48a3 (2 revisions) (flutter/flutter#170821) 2025-06-18 [email protected] Add an initial "Using feature flags" doc for the team. (flutter/flutter#170767) 2025-06-18 [email protected] Feat: Add mouse cursor for CupertinoDialogAction (flutter/flutter#169051) 2025-06-18 [email protected] Update `Engine-artifacts.md` to reflect flutter/cocoon/4785 (flutter/flutter#170751) 2025-06-18 [email protected] `CupertinoPicker` new onChanged behaviour (flutter/flutter#170202) 2025-06-18 [email protected] Rename `entryPointBaseUrl` to `entrypointBaseUrl` (flutter/flutter#170166) 2025-06-18 [email protected] Roll Skia from 1cb13a21b547 to 297dbc32a6c7 (4 revisions) (flutter/flutter#170809) 2025-06-18 [email protected] Roll Packages from 25d4fa4 to 715a0a5 (2 revisions) (flutter/flutter#170808) 2025-06-18 [email protected] Roll Skia from 0a106c038cd0 to 1cb13a21b547 (1 revision) (flutter/flutter#170801) 2025-06-18 [email protected] Add `--profile-microtasks` switch (flutter/flutter#170690) 2025-06-18 [email protected] Roll Skia from ff7fffa5dac5 to 0a106c038cd0 (3 revisions) (flutter/flutter#170795) 2025-06-18 [email protected] Add example for CupertinoExpansionTile transition modes (flutter/flutter#170335) 2025-06-18 [email protected] feat: Add radius to DividerThemeData. (flutter/flutter#169739) 2025-06-18 [email protected] Roll Skia from 75af9450b121 to ff7fffa5dac5 (3 revisions) (flutter/flutter#170772) 2025-06-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "add run_gradle_lock_files_check.dart for new PR's that modify gradle files (#169245)" (flutter/flutter#170770) 2025-06-17 [email protected] Started bridging the scene delegate to the lifecycle delegate for shortcuts (flutter/flutter#170180) 2025-06-17 [email protected] [ui] npot display_list allocation. (flutter/flutter#170447) 2025-06-17 [email protected] Prefer .of over .from (flutter/flutter#170750) 2025-06-17 [email protected] Fix RawGestureDetector semantics (flutter/flutter#170549) 2025-06-17 [email protected] Use correct type for filterIdentifier (flutter/flutter#170343) 2025-06-17 [email protected] Remove and inline `license_header.txt` (flutter/flutter#170475) 2025-06-17 [email protected] add run_gradle_lock_files_check.dart for new PR's that modify gradle files (flutter/flutter#169245) 2025-06-17 [email protected] Roll Dart SDK from 4fad61257b29 to b32559bca3cc (3 revisions) (flutter/flutter#170746) 2025-06-17 [email protected] [release] Sync stable changelog to master (flutter/flutter#170691) 2025-06-17 [email protected] Roll Packages from 03a6abb to 25d4fa4 (5 revisions) (flutter/flutter#170743) 2025-06-17 [email protected] [ Widget Preview ] Remove support for synthetic package:flutter_gen (flutter/flutter#170602) 2025-06-17 [email protected] Roll Skia from 8879db3b3319 to 75af9450b121 (4 revisions) (flutter/flutter#170739) ...
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…r#9457) Roll Flutter from 8303a96a0a99 to 85a9b4f38906 (93 revisions) flutter/flutter@8303a96...85a9b4f 2025-06-19 [email protected] Roll Skia from af242598f14d to 794936b23812 (2 revisions) (flutter/flutter#170875) 2025-06-19 [email protected] Drop support for 21/22 Lollipop (flutter/flutter#170748) 2025-06-19 [email protected] Roll Dart SDK from 6020126c10e8 to bce9abe03175 (1 revision) (flutter/flutter#170872) 2025-06-19 [email protected] Roll Skia from df97f7f407db to af242598f14d (4 revisions) (flutter/flutter#170867) 2025-06-19 [email protected] Roll Skia from 1d8f7ebd23cc to df97f7f407db (5 revisions) (flutter/flutter#170864) 2025-06-19 [email protected] Roll Dart SDK from 4ab716b09e9d to 6020126c10e8 (1 revision) (flutter/flutter#170862) 2025-06-19 [email protected] Roll Skia from 291d41414fa7 to 1d8f7ebd23cc (2 revisions) (flutter/flutter#170857) 2025-06-19 [email protected] Roll Dart SDK from b32559bca3cc to 4ab716b09e9d (9 revisions) (flutter/flutter#170855) 2025-06-19 [email protected] remove --start-paused flag by default and set useDwdsWebSocketConnect… (flutter/flutter#170612) 2025-06-18 [email protected] Engine builders no longer require `is_fusion` (flutter/flutter#170849) 2025-06-18 [email protected] Roll Skia from 5f110d5f48a3 to 291d41414fa7 (2 revisions) (flutter/flutter#170836) 2025-06-18 [email protected] Use a shared vertex buffer for rendering layers. (flutter/flutter#170717) 2025-06-18 [email protected] fixes deeplinking in uiscenedelegate migrated projects (flutter/flutter#170452) 2025-06-18 [email protected] [Impeller] fix array uniforms on GLES backend. (flutter/flutter#170710) 2025-06-18 [email protected] [Impeller] Update README to add section about custom embedders. (flutter/flutter#170077) 2025-06-18 [email protected] Escape the forbidden strings in the regex used to check test command output (flutter/flutter#170702) 2025-06-18 [email protected] License cpp jun16 (flutter/flutter#170716) 2025-06-18 [email protected] Work around newer compilers requiring the satisfaction of three-way comparison of EncodableValue. (flutter/flutter#170822) 2025-06-18 [email protected] Update didUnmountRenderObject text description (flutter/flutter#169628) 2025-06-18 [email protected] Roll Skia from 297dbc32a6c7 to 5f110d5f48a3 (2 revisions) (flutter/flutter#170821) 2025-06-18 [email protected] Add an initial "Using feature flags" doc for the team. (flutter/flutter#170767) 2025-06-18 [email protected] Feat: Add mouse cursor for CupertinoDialogAction (flutter/flutter#169051) 2025-06-18 [email protected] Update `Engine-artifacts.md` to reflect flutter/cocoon/4785 (flutter/flutter#170751) 2025-06-18 [email protected] `CupertinoPicker` new onChanged behaviour (flutter/flutter#170202) 2025-06-18 [email protected] Rename `entryPointBaseUrl` to `entrypointBaseUrl` (flutter/flutter#170166) 2025-06-18 [email protected] Roll Skia from 1cb13a21b547 to 297dbc32a6c7 (4 revisions) (flutter/flutter#170809) 2025-06-18 [email protected] Roll Packages from 25d4fa4 to 715a0a5 (2 revisions) (flutter/flutter#170808) 2025-06-18 [email protected] Roll Skia from 0a106c038cd0 to 1cb13a21b547 (1 revision) (flutter/flutter#170801) 2025-06-18 [email protected] Add `--profile-microtasks` switch (flutter/flutter#170690) 2025-06-18 [email protected] Roll Skia from ff7fffa5dac5 to 0a106c038cd0 (3 revisions) (flutter/flutter#170795) 2025-06-18 [email protected] Add example for CupertinoExpansionTile transition modes (flutter/flutter#170335) 2025-06-18 [email protected] feat: Add radius to DividerThemeData. (flutter/flutter#169739) 2025-06-18 [email protected] Roll Skia from 75af9450b121 to ff7fffa5dac5 (3 revisions) (flutter/flutter#170772) 2025-06-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "add run_gradle_lock_files_check.dart for new PR's that modify gradle files (#169245)" (flutter/flutter#170770) 2025-06-17 [email protected] Started bridging the scene delegate to the lifecycle delegate for shortcuts (flutter/flutter#170180) 2025-06-17 [email protected] [ui] npot display_list allocation. (flutter/flutter#170447) 2025-06-17 [email protected] Prefer .of over .from (flutter/flutter#170750) 2025-06-17 [email protected] Fix RawGestureDetector semantics (flutter/flutter#170549) 2025-06-17 [email protected] Use correct type for filterIdentifier (flutter/flutter#170343) 2025-06-17 [email protected] Remove and inline `license_header.txt` (flutter/flutter#170475) 2025-06-17 [email protected] add run_gradle_lock_files_check.dart for new PR's that modify gradle files (flutter/flutter#169245) 2025-06-17 [email protected] Roll Dart SDK from 4fad61257b29 to b32559bca3cc (3 revisions) (flutter/flutter#170746) 2025-06-17 [email protected] [release] Sync stable changelog to master (flutter/flutter#170691) 2025-06-17 [email protected] Roll Packages from 03a6abb to 25d4fa4 (5 revisions) (flutter/flutter#170743) 2025-06-17 [email protected] [ Widget Preview ] Remove support for synthetic package:flutter_gen (flutter/flutter#170602) 2025-06-17 [email protected] Roll Skia from 8879db3b3319 to 75af9450b121 (4 revisions) (flutter/flutter#170739) ...
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Closes flutter#170456. There are still some TODOs I'd like to address, but in follow-up PRs: - Update the `# Framework` sub-sections after flutter#168437 merges - Add known limitations (i.e. embedder/engine) - Add best practices (using a feature flag versus just using a parameter, named constructor, etc)
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…r#9457) Roll Flutter from 8303a96a0a99 to 85a9b4f38906 (93 revisions) flutter/flutter@8303a96...85a9b4f 2025-06-19 [email protected] Roll Skia from af242598f14d to 794936b23812 (2 revisions) (flutter/flutter#170875) 2025-06-19 [email protected] Drop support for 21/22 Lollipop (flutter/flutter#170748) 2025-06-19 [email protected] Roll Dart SDK from 6020126c10e8 to bce9abe03175 (1 revision) (flutter/flutter#170872) 2025-06-19 [email protected] Roll Skia from df97f7f407db to af242598f14d (4 revisions) (flutter/flutter#170867) 2025-06-19 [email protected] Roll Skia from 1d8f7ebd23cc to df97f7f407db (5 revisions) (flutter/flutter#170864) 2025-06-19 [email protected] Roll Dart SDK from 4ab716b09e9d to 6020126c10e8 (1 revision) (flutter/flutter#170862) 2025-06-19 [email protected] Roll Skia from 291d41414fa7 to 1d8f7ebd23cc (2 revisions) (flutter/flutter#170857) 2025-06-19 [email protected] Roll Dart SDK from b32559bca3cc to 4ab716b09e9d (9 revisions) (flutter/flutter#170855) 2025-06-19 [email protected] remove --start-paused flag by default and set useDwdsWebSocketConnect… (flutter/flutter#170612) 2025-06-18 [email protected] Engine builders no longer require `is_fusion` (flutter/flutter#170849) 2025-06-18 [email protected] Roll Skia from 5f110d5f48a3 to 291d41414fa7 (2 revisions) (flutter/flutter#170836) 2025-06-18 [email protected] Use a shared vertex buffer for rendering layers. (flutter/flutter#170717) 2025-06-18 [email protected] fixes deeplinking in uiscenedelegate migrated projects (flutter/flutter#170452) 2025-06-18 [email protected] [Impeller] fix array uniforms on GLES backend. (flutter/flutter#170710) 2025-06-18 [email protected] [Impeller] Update README to add section about custom embedders. (flutter/flutter#170077) 2025-06-18 [email protected] Escape the forbidden strings in the regex used to check test command output (flutter/flutter#170702) 2025-06-18 [email protected] License cpp jun16 (flutter/flutter#170716) 2025-06-18 [email protected] Work around newer compilers requiring the satisfaction of three-way comparison of EncodableValue. (flutter/flutter#170822) 2025-06-18 [email protected] Update didUnmountRenderObject text description (flutter/flutter#169628) 2025-06-18 [email protected] Roll Skia from 297dbc32a6c7 to 5f110d5f48a3 (2 revisions) (flutter/flutter#170821) 2025-06-18 [email protected] Add an initial "Using feature flags" doc for the team. (flutter/flutter#170767) 2025-06-18 [email protected] Feat: Add mouse cursor for CupertinoDialogAction (flutter/flutter#169051) 2025-06-18 [email protected] Update `Engine-artifacts.md` to reflect flutter/cocoon/4785 (flutter/flutter#170751) 2025-06-18 [email protected] `CupertinoPicker` new onChanged behaviour (flutter/flutter#170202) 2025-06-18 [email protected] Rename `entryPointBaseUrl` to `entrypointBaseUrl` (flutter/flutter#170166) 2025-06-18 [email protected] Roll Skia from 1cb13a21b547 to 297dbc32a6c7 (4 revisions) (flutter/flutter#170809) 2025-06-18 [email protected] Roll Packages from 25d4fa4 to 715a0a5 (2 revisions) (flutter/flutter#170808) 2025-06-18 [email protected] Roll Skia from 0a106c038cd0 to 1cb13a21b547 (1 revision) (flutter/flutter#170801) 2025-06-18 [email protected] Add `--profile-microtasks` switch (flutter/flutter#170690) 2025-06-18 [email protected] Roll Skia from ff7fffa5dac5 to 0a106c038cd0 (3 revisions) (flutter/flutter#170795) 2025-06-18 [email protected] Add example for CupertinoExpansionTile transition modes (flutter/flutter#170335) 2025-06-18 [email protected] feat: Add radius to DividerThemeData. (flutter/flutter#169739) 2025-06-18 [email protected] Roll Skia from 75af9450b121 to ff7fffa5dac5 (3 revisions) (flutter/flutter#170772) 2025-06-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "add run_gradle_lock_files_check.dart for new PR's that modify gradle files (#169245)" (flutter/flutter#170770) 2025-06-17 [email protected] Started bridging the scene delegate to the lifecycle delegate for shortcuts (flutter/flutter#170180) 2025-06-17 [email protected] [ui] npot display_list allocation. (flutter/flutter#170447) 2025-06-17 [email protected] Prefer .of over .from (flutter/flutter#170750) 2025-06-17 [email protected] Fix RawGestureDetector semantics (flutter/flutter#170549) 2025-06-17 [email protected] Use correct type for filterIdentifier (flutter/flutter#170343) 2025-06-17 [email protected] Remove and inline `license_header.txt` (flutter/flutter#170475) 2025-06-17 [email protected] add run_gradle_lock_files_check.dart for new PR's that modify gradle files (flutter/flutter#169245) 2025-06-17 [email protected] Roll Dart SDK from 4fad61257b29 to b32559bca3cc (3 revisions) (flutter/flutter#170746) 2025-06-17 [email protected] [release] Sync stable changelog to master (flutter/flutter#170691) 2025-06-17 [email protected] Roll Packages from 03a6abb to 25d4fa4 (5 revisions) (flutter/flutter#170743) 2025-06-17 [email protected] [ Widget Preview ] Remove support for synthetic package:flutter_gen (flutter/flutter#170602) 2025-06-17 [email protected] Roll Skia from 8879db3b3319 to 75af9450b121 (4 revisions) (flutter/flutter#170739) ...
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Closes #170456.
There are still some TODOs I'd like to address, but in follow-up PRs:
# Frameworksub-sections after Add feature flags to the framework #168437 merges