fix(combobox): initialize virtualized options on open

[waleedlatif1]

Summary

• Initialize virtualized combobox options when the popover scroll container mounts.
• Add regression coverage for large lists, portals, reopening, keyboard selection, scrolling, and filtering.

Type of Change

• Bug fix

Testing

• Confirmed six new cases fail before the fix and pass afterward.
• Shared-component suite: 185 tests passed; TypeScript passed.
• Real-browser fixture with production component/CSS: first open, reopen, last-row scrolling/selection, filtering, and editable keyboard selection passed.
• Cleanup review, lint, all 45 repository audits, API validation, and docs manifest checks passed.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 3, 2026 8:08pm UTC

[greptile-apps]

Greptile Summary

The PR replaces the combobox’s mutable scroll-area ref with state so the virtualizer is updated when the popover’s scroll container mounts.

• Initializes virtualized options on first open and reopening, with and without a portal.
• Adds coverage for keyboard selection, scrolling beyond the initial window, and filtering across the virtualization threshold.
• Adds deterministic JSDOM element dimensions for virtualizer testing.

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, or test-isolation issues identified.

The mounted scroll element now causes the virtualizer to reconfigure, while regression tests cover portal behavior, reopening, keyboard interaction, scrolling, and filtering; existing cleanup restores the added prototype spies after every test.

Important Files Changed

Filename	Overview
packages/emcn/src/components/combobox/combobox.tsx	Replaces the scroll-area ref with state and supplies the mounted element to the virtualizer; no actionable defect was identified.
packages/emcn/src/components/combobox/combobox.dom.test.tsx	Adds focused virtualized-combobox regression coverage with prototype mocks that are restored by the existing test cleanup.

_{Reviews (1): Last reviewed commit: "fix(combobox): initialize virtualized op..." | Re-trigger Greptile}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}