[alexus37]

Closes #8608

Moves ActionMenu trigger-label capture out of passive effects and into the open interaction, where React batches it with the existing open update. This avoids an extra commit when closed menus mount while preserving the accessible name on first open.

Adds focused regression coverage for closed-mount render count, first-open labeling, Escape, Tab, selection, and focus restoration. No visual changes are expected.

Changelog

New

• None.

Changed

• ActionMenu no longer schedules an avoidable follow-up render to publish its trigger label after mount.
• ActionMenu retains trigger-derived accessible labeling and existing close/focus behavior.

Removed

• None.

Rollout strategy

• No changes needed in github/github-ui
• Needs changes in github/github-ui
• Ships with feature flag(s)
• Not sure
• None

Testing & Reviewing

• npm test -- packages/react/src/ActionMenu/ActionMenu.test.tsx — passed (59 tests)
• npm run build — passed
• npm test — passed (160 files; 2,902 passed, 3 skipped, 10 todo)
• npm run type-check — passed
• npm run lint — passed
• npm run lint:css — passed
• npm run format:diff — passed
• STORYBOOK_URL=http://localhost:6006 npx playwright test --grep @avt — passed (8 tests)

Review the focused tests for the first-open accessible name and the different close/focus paths. The mount profiler assertion should remain at zero update commits after effects flush.

[changeset-bot]

🦋 Changeset detected

Latest commit: 21ee8c6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.

[Copilot]

🟡 Changes recommended

With native CSS anchor positioning enabled, first-open focus can enter the menu before its accessible label is available.

1 open issue

• Resolve trigger label before focusing initially opened menu · New

What changed in this PR

This PR addresses #8608 by avoiding label-state updates when closed ActionMenus mount, with regression coverage for labeling and focus behavior.

Changes:

• Restricts trigger-label capture to a passive effect while the menu is open.
• Adds closed-mount render-count, controlled-labeling, and close/focus tests.
• Adds a patch changeset for @primer/react.

File	Description
packages/​react/​src/​ActionMenu/​ActionMenu.tsx	Gates trigger-label updates on the open state.
packages/​react/​src/​ActionMenu/​ActionMenu.test.tsx	Adds render-count, labeling, and focus regression coverage.
.changeset/​quiet-action-menu-labels.md	Documents the closed-mount rendering improvement.

_{Review effort: Balanced}

[primer-integration]

⚠️ Integration PR Outdated

This integration PR does not have the latest commit from the primer/react PR.

Integration PR references: e6416ac07a4d521944a3e015542df668b5502e56
Latest commit on primer/react PR: 21ee8c6c363fff45b22155d32a612ff6a134e4ad

Please update the integration PR to reference the latest commit from the primer/react PR before reviewing workflow results.