Docs(ActionList): focus last selected li on group clear in mixed selection story

[francinelucca]

Closes https://github.com/github/primer/issues/3558

Fixes focus issue in ActionList Mixed Selections story where focus would be lost when group clear button is activated.

Changelog

New

• uses ref in ActionList Mixed Selections story to find and focus last selected item when group clear button is activated.

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Docs (storybook) only update

Testing & Reviewing

Verify keyboard navigation on deployed ActionList - Mixed Selections story. Notice focus does not get lost when group clear button is activated.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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Latest commit: 813f85f

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[francinelucca]

Opted to focus the last previously-selected item here after clear, but can update it to be the first/last element or whatever other element is preferred. Wondering if @primer/design-reviewers have any input here CC: @maximedegreve

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	97.09 KB (0%)
packages/react/dist/browser.umd.js	97.33 KB (0%)