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[flutter_tools] Fix test flakiness in widget_preview_detection_test.dart#188922

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Jul 6, 2026
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[flutter_tools] Fix test flakiness in widget_preview_detection_test.dart#188922
auto-submit[bot] merged 2 commits into
flutter:masterfrom
bkonyi:subagent-Builder-Agent-self-5dae62ca

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@bkonyi bkonyi commented Jul 2, 2026

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Moves the stream.listen setup and Completer initialization BEFORE the filesystem modifications (e.g. deleteSync(), writeAsStringSync(), createSync()) in all test cases to prevent race conditions during the reload detection. Also adds a !completer.isCompleted guard when completing.

Fixes #185991

…dart`

Moves the `stream.listen` setup and `Completer` initialization BEFORE the filesystem modifications (e.g. `deleteSync()`, `writeAsStringSync()`, `createSync()`) in all test cases to prevent race conditions during the reload detection. Also adds a `!completer.isCompleted` guard when completing.

Fixes flutter#185991
@github-actions github-actions Bot added the tool Affects the "flutter" command-line tool. See also t: labels. label Jul 2, 2026
@bkonyi bkonyi added the CICD Run CI/CD label Jul 2, 2026
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bkonyi requested a review from srawlins July 2, 2026 16:23
@bkonyi
bkonyi marked this pull request as ready for review July 2, 2026 16:23

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Code Review

This pull request modifies 'widget_preview_detection_test.dart' to initialize reload completers and stream subscriptions before performing file operations, and adds checks to ensure completers are not completed multiple times. The review feedback highlights that the created StreamSubscription instances are never cancelled, which can lead to memory leaks and test flakiness. It is recommended to cancel these subscriptions within their listener callbacks once the reload event is detected.

srawlins
srawlins previously approved these changes Jul 2, 2026
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
@bkonyi bkonyi added the autosubmit Merge PR when tree becomes green via auto submit App label Jul 6, 2026
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auto-submit Bot added this pull request to the merge queue Jul 6, 2026
Merged via the queue into flutter:master with commit 9e76f5b Jul 6, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jul 6, 2026
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jul 8, 2026
…12137)

Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions)

Manual roll requested by [email protected]

flutter/flutter@6995038...91939cc

2026-07-07 [email protected] Roll Skia from 80ae1deed9ed to 075fbe4778d9 (6 revisions) (flutter/flutter#189067)
2026-07-07 [email protected] Bump customer testing version for new registrants (flutter/flutter#189070)
2026-07-07 [email protected] Roll Packages from fc00ceb to 92525f5 (2 revisions) (flutter/flutter#189069)
2026-07-07 [email protected] fix android semantics integration test hangs due to postframe callback (flutter/flutter#189043)
2026-07-07 [email protected] Bump goldctl (flutter/flutter#189030)
2026-07-07 [email protected] Roll Skia from 71db7c06c5fe to 80ae1deed9ed (2 revisions) (flutter/flutter#189060)
2026-07-07 [email protected] Collect analytics on AI agent usage (flutter/flutter#187630)
2026-07-07 [email protected] Roll Skia from 125a76cc4cf3 to 71db7c06c5fe (4 revisions) (flutter/flutter#189054)
2026-07-07 [email protected] Roll Dart SDK from 70577d6f2bba to c648e3429d76 (1 revision) (flutter/flutter#189052)
2026-07-07 [email protected] Fix RenderSliverPadding setter assertion (flutter/flutter#187353)
2026-07-07 [email protected] Roll Skia from 2dde156aec3e to 125a76cc4cf3 (3 revisions) (flutter/flutter#189037)
2026-07-07 [email protected] Explain asynchronous causes in the setState() called after dispose() error (flutter/flutter#187294)
2026-07-07 [email protected] Roll Skia from 7dccd1e79a5b to 2dde156aec3e (2 revisions) (flutter/flutter#189035)
2026-07-07 [email protected] Add `STRING_CATALOG_GENERATE_SYMBOLS = YES;` (flutter/flutter#188163)
2026-07-07 [email protected] Print warnings on Intel Macs / targeting Intel Macs (flutter/flutter#188835)
2026-07-07 [email protected] Roll Dart SDK from 4c03f64b19f6 to 70577d6f2bba (1 revision) (flutter/flutter#189031)
2026-07-07 [email protected] Roll Fuchsia Linux SDK from n1Lm2Z4DZkfC3bwj5... to 7RjQJBW3m-3Jl-7jr... (flutter/flutter#189032)
2026-07-06 [email protected] Recommend `OverlayPortal.overlayChildLayoutBuilder` over Target-Follower (flutter/flutter#188894)
2026-07-06 [email protected] Sync CHANGELOG.md from stable (flutter/flutter#189025)
2026-07-06 [email protected] Rename preferredSize to size and preferredConstraints to constraints in the windowing API (flutter/flutter#189017)
2026-07-06 [email protected] Skip locked issues in no-response check (flutter/flutter#188950)
2026-07-06 [email protected] Fix potential race condtion in android_semantics_integration_test (flutter/flutter#188830)
2026-07-06 [email protected] ci: udpate wait-for-engine-build composite action to cocoon (flutter/flutter#189020)
2026-07-06 [email protected] Roll Skia from 2b55eed5500d to 7dccd1e79a5b (3 revisions) (flutter/flutter#189021)
2026-07-06 [email protected] [AGP 9] Update Flutter Template Versions (flutter/flutter#188762)
2026-07-06 [email protected] fix(engine/windows): keep tooltip position rect alive - fix use after free (flutter/flutter#188476)
2026-07-06 [email protected] [Tool] Fix null check operator crash in currentPackageConfig (flutter/flutter#188454)
2026-07-06 [email protected] [Tool] Gracefully handle WDAC/AppLocker blocks for impellerc (flutter/flutter#188452)
2026-07-06 [email protected] [flutter_tools] Throw DaemonException if app fails to start early (flutter/flutter#188921)
2026-07-06 [email protected] Roll Dart SDK from ce7a2567eb59 to 4c03f64b19f6 (2 revisions) (flutter/flutter#189015)
2026-07-06 [email protected] [flutter_tools, engine] Add --disable-service-origin-check option to disable VM service origin checks (flutter/flutter#188745)
2026-07-06 [email protected] [flutter_tools] Fix test flakiness in widget_preview_detection_test.dart (flutter/flutter#188922)
2026-07-06 [email protected] Roll pub packages (flutter/flutter#189009)
2026-07-06 [email protected] Roll Skia from c0e2b9667d91 to 2b55eed5500d (1 revision) (flutter/flutter#189006)
2026-07-06 [email protected] Roll Packages from 2fbe873 to fc00ceb (1 revision) (flutter/flutter#189007)
2026-07-06 [email protected] Roll Skia from b68567542f81 to c0e2b9667d91 (1 revision) (flutter/flutter#189004)
2026-07-06 [email protected] Fixing multiline GetBoxesForRange (flutter/flutter#188803)
2026-07-06 [email protected] Roll Skia from e15ea7a4b927 to b68567542f81 (4 revisions) (flutter/flutter#189000)
2026-07-06 [email protected] Roll Skia from 79806692425f to e15ea7a4b927 (2 revisions) (flutter/flutter#188992)
2026-07-06 [email protected] Roll Skia from 2826ae6dc649 to 79806692425f (1 revision) (flutter/flutter#188991)
2026-07-06 [email protected] Roll Skia from 7f99eee20fd6 to 2826ae6dc649 (1 revision) (flutter/flutter#188990)
2026-07-06 [email protected] Add debugPaintFocusBoxes (flutter/flutter#188288)
2026-07-05 [email protected] Roll Fuchsia Linux SDK from bkK6BLiZDRnE7AQQj... to n1Lm2Z4DZkfC3bwj5... (flutter/flutter#188989)
2026-07-05 [email protected] Roll Skia from 75a4bf6706bd to 7f99eee20fd6 (2 revisions) (flutter/flutter#188988)
...
kalyujniy pushed a commit to brickit-app/camera that referenced this pull request Jul 8, 2026
…lutter#12137)

Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions)

Manual roll requested by [email protected]

flutter/flutter@6995038...91939cc

2026-07-07 [email protected] Roll Skia from 80ae1deed9ed to 075fbe4778d9 (6 revisions) (flutter/flutter#189067)
2026-07-07 [email protected] Bump customer testing version for new registrants (flutter/flutter#189070)
2026-07-07 [email protected] Roll Packages from fc00ceb to 92525f5 (2 revisions) (flutter/flutter#189069)
2026-07-07 [email protected] fix android semantics integration test hangs due to postframe callback (flutter/flutter#189043)
2026-07-07 [email protected] Bump goldctl (flutter/flutter#189030)
2026-07-07 [email protected] Roll Skia from 71db7c06c5fe to 80ae1deed9ed (2 revisions) (flutter/flutter#189060)
2026-07-07 [email protected] Collect analytics on AI agent usage (flutter/flutter#187630)
2026-07-07 [email protected] Roll Skia from 125a76cc4cf3 to 71db7c06c5fe (4 revisions) (flutter/flutter#189054)
2026-07-07 [email protected] Roll Dart SDK from 70577d6f2bba to c648e3429d76 (1 revision) (flutter/flutter#189052)
2026-07-07 [email protected] Fix RenderSliverPadding setter assertion (flutter/flutter#187353)
2026-07-07 [email protected] Roll Skia from 2dde156aec3e to 125a76cc4cf3 (3 revisions) (flutter/flutter#189037)
2026-07-07 [email protected] Explain asynchronous causes in the setState() called after dispose() error (flutter/flutter#187294)
2026-07-07 [email protected] Roll Skia from 7dccd1e79a5b to 2dde156aec3e (2 revisions) (flutter/flutter#189035)
2026-07-07 [email protected] Add `STRING_CATALOG_GENERATE_SYMBOLS = YES;` (flutter/flutter#188163)
2026-07-07 [email protected] Print warnings on Intel Macs / targeting Intel Macs (flutter/flutter#188835)
2026-07-07 [email protected] Roll Dart SDK from 4c03f64b19f6 to 70577d6f2bba (1 revision) (flutter/flutter#189031)
2026-07-07 [email protected] Roll Fuchsia Linux SDK from n1Lm2Z4DZkfC3bwj5... to 7RjQJBW3m-3Jl-7jr... (flutter/flutter#189032)
2026-07-06 [email protected] Recommend `OverlayPortal.overlayChildLayoutBuilder` over Target-Follower (flutter/flutter#188894)
2026-07-06 [email protected] Sync CHANGELOG.md from stable (flutter/flutter#189025)
2026-07-06 [email protected] Rename preferredSize to size and preferredConstraints to constraints in the windowing API (flutter/flutter#189017)
2026-07-06 [email protected] Skip locked issues in no-response check (flutter/flutter#188950)
2026-07-06 [email protected] Fix potential race condtion in android_semantics_integration_test (flutter/flutter#188830)
2026-07-06 [email protected] ci: udpate wait-for-engine-build composite action to cocoon (flutter/flutter#189020)
2026-07-06 [email protected] Roll Skia from 2b55eed5500d to 7dccd1e79a5b (3 revisions) (flutter/flutter#189021)
2026-07-06 [email protected] [AGP 9] Update Flutter Template Versions (flutter/flutter#188762)
2026-07-06 [email protected] fix(engine/windows): keep tooltip position rect alive - fix use after free (flutter/flutter#188476)
2026-07-06 [email protected] [Tool] Fix null check operator crash in currentPackageConfig (flutter/flutter#188454)
2026-07-06 [email protected] [Tool] Gracefully handle WDAC/AppLocker blocks for impellerc (flutter/flutter#188452)
2026-07-06 [email protected] [flutter_tools] Throw DaemonException if app fails to start early (flutter/flutter#188921)
2026-07-06 [email protected] Roll Dart SDK from ce7a2567eb59 to 4c03f64b19f6 (2 revisions) (flutter/flutter#189015)
2026-07-06 [email protected] [flutter_tools, engine] Add --disable-service-origin-check option to disable VM service origin checks (flutter/flutter#188745)
2026-07-06 [email protected] [flutter_tools] Fix test flakiness in widget_preview_detection_test.dart (flutter/flutter#188922)
2026-07-06 [email protected] Roll pub packages (flutter/flutter#189009)
2026-07-06 [email protected] Roll Skia from c0e2b9667d91 to 2b55eed5500d (1 revision) (flutter/flutter#189006)
2026-07-06 [email protected] Roll Packages from 2fbe873 to fc00ceb (1 revision) (flutter/flutter#189007)
2026-07-06 [email protected] Roll Skia from b68567542f81 to c0e2b9667d91 (1 revision) (flutter/flutter#189004)
2026-07-06 [email protected] Fixing multiline GetBoxesForRange (flutter/flutter#188803)
2026-07-06 [email protected] Roll Skia from e15ea7a4b927 to b68567542f81 (4 revisions) (flutter/flutter#189000)
2026-07-06 [email protected] Roll Skia from 79806692425f to e15ea7a4b927 (2 revisions) (flutter/flutter#188992)
2026-07-06 [email protected] Roll Skia from 2826ae6dc649 to 79806692425f (1 revision) (flutter/flutter#188991)
2026-07-06 [email protected] Roll Skia from 7f99eee20fd6 to 2826ae6dc649 (1 revision) (flutter/flutter#188990)
2026-07-06 [email protected] Add debugPaintFocusBoxes (flutter/flutter#188288)
2026-07-05 [email protected] Roll Fuchsia Linux SDK from bkK6BLiZDRnE7AQQj... to n1Lm2Z4DZkfC3bwj5... (flutter/flutter#188989)
2026-07-05 [email protected] Roll Skia from 75a4bf6706bd to 7f99eee20fd6 (2 revisions) (flutter/flutter#188988)
...
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widget_preview_detection_test test: Timed out waiting for deletion reload message in Remove test!

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