[rickyzhangca]

Adds selection checkboxes to collapsible groups when rowSelection is enabled. Each checkbox selects the group's selectable rows on the current page, including collapsed members, and reflects mixed or disabled states.

Context: row selection handoff.

Before	After

Same data and viewport; before uses the current main implementation.

Changelog

• Add controlled selection, selectionDisabled, and onToggleSelect props to Table.Group.
• Align checkboxes and group/member labels, tighten disclosure spacing, and restore normal row height while keeping the 24px disclosure target.
• Update the existing collapsible story; no additional story.

Rollout strategy

• No changes needed in github/github-ui

Testing & Reviewing

• 92 component tests passed, including selection scope, disabled/mixed states, controlled updates, and LTR/RTL alignment at all three densities.
• Keyboard/focus and axe browser test passed; TypeScript, ESLint, and formatting checks passed.
• Linux visual snapshots will be updated by the repository's update snapshots workflow.
• Manual screen-reader verification remains pending.

[changeset-bot]

🦋 Changeset detected

Latest commit: b9081ba

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	Minor

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.

[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[Copilot]

🟡 Changes recommended

Two tests target a primer/css checkbox in unchanged stories that still render strapi, causing both clicks to time out and preventing the tests from completing.

2 open issues

• Restore original checkbox name for mixed-state visual test · New
• Restore original checkbox name for unchanged keyboard sorting story · New

What changed in this PR

Adds group-level selection to Primer React’s collapsible DataTable groups, allowing users to select current-page members even while a group is collapsed.

Changes:

• Adds group checkboxes with mixed and disabled states, plus controlled selection props for Table.Group.
• Aligns group and row controls and updates the existing collapsible-groups story.
• Adds selection coverage and updates accessibility guidance, API documentation, and release notes.

File	Description
packages/​react/​src/​DataTable/​useTable.ts	Computes group selection state and toggles selectable members.
packages/​react/​src/​DataTable/​TableGroup.tsx	Adds controlled group checkboxes and header structure.
packages/​react/​src/​DataTable/​Table.module.css	Aligns controls and labels and adjusts disclosure spacing.
packages/​react/​src/​DataTable/​DataTable.tsx	Connects group checkboxes to selection actions.
packages/​react/​src/​DataTable/​DataTable.features.stories.tsx	Updates the collapsible-groups example.
packages/​react/​src/​DataTable/​DataTable.docs.json	Documents group selection props and behavior.
packages/​react/​src/​DataTable/​DataTable.accessibility.md	Describes checkbox scope, states, and keyboard order.
packages/​react/​src/​DataTable/​__tests__/​DataTableGroupSelection.test.tsx	Covers selection scope, disabled groups, and controlled updates.
packages/​react/​src/​DataTable/​__tests__/​DataTableExpansion.test.tsx	Updates alignment checks across directions and densities.
e2e/​components/​DataTable.test.ts	Updates group-selection interactions and checkbox locators.
.changeset/​tidy-groups-select.md	Records the feature as a minor release.

_{Review effort: Balanced}

[primer-integration]

Integration test results from github/github-ui PR:

  Changes Waiting
  CI Passed
  VRT Waiting
  Projects Waiting