fix: remove min height calc logic for SelectPanel

[KirankumarAmbati]

Closes #6220

Changelog

New

Changed

Removed

• Min height calculation logic for SelectPanel

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

Testing & Reviewing

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)

[changeset-bot]

🦋 Changeset detected

Latest commit: f4387ab

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

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[KirankumarAmbati]

@francinelucca Tagging you here as we are already discussing reg this 🙇

[Copilot]

Pull Request Overview

This PR removes the dynamic min-height calculation for the SelectPanel component, simplifying its sizing behavior and dropping the heightMap dependency.

• Deleted the heightMap import from Overlay
• Removed the --max-height inline style that set panel height based on overlayProps.maxHeight

Files not reviewed (1)

• packages/react/src/SelectPanel/SelectPanel.module.css: Language not supported

Comments suppressed due to low confidence (2)

packages/react/src/SelectPanel/SelectPanel.tsx:23

• With the removal of heightMap and --max-height logic, please update the SelectPanel documentation (PropTable and website docs) to reflect that maxHeight is no longer used for sizing.

import {announce, announceFromElement} from '@primer/live-region-element'

packages/react/src/SelectPanel/SelectPanel.tsx:722

• Add or update unit/visual regression tests to verify that SelectPanel renders correctly with default sizing and that removing the --max-height style doesn’t introduce layout regressions.

          style: {

[francinelucca]

👍