fix(combobox): portal content inside Theme scope (#1100)

[kotAPI]

Summary

• Combobox portal targets ThemeContext refs instead of querySelector
• Keeps optional container prop support

Fixes #1100

Test plan

• npm test -- --testPathPatterns=Combobox

Summary by CodeRabbit

• Refactor
  • Enhanced combobox dropdown portal rendering to use theme context for root element detection, improving compatibility when rendering dropdowns in custom theme containers.

[changeset-bot]

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Latest commit: 14eb45d

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3ce1623f-0202-4e3c-8c39-3dfae8146d90

📥 Commits

Reviewing files that changed from the base of the PR and between fe87b36 and 14eb45d.

📒 Files selected for processing (1)

• src/core/primitives/Combobox/fragments/ComboboxPrimitivePortal.tsx

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📝 Walkthrough

Walkthrough

ComboboxPrimitivePortal replaces a static #rad-ui-theme-container DOM query and rootElementFound state with a ThemeContext-derived root ref (rootElementRef) and an isMounted flag. The portal now renders only after the effect resolves the root element and sets isMounted.

Changes

ComboboxPrimitivePortal Root Resolution

Layer / File(s)	Summary
Portal root resolution and render gate src/core/primitives/Combobox/fragments/ComboboxPrimitivePortal.tsx	Imports useRef and ThemeContext; replaces rootElementFound state and the #rad-ui-theme-container querySelector with rootElementRef assigned inside useEffect from container, then themeContext refs, then document.body, followed by setIsMounted(true); the render gate changes from !rootElementFound to !isMounted, and Floater.Portal receives root={rootElementRef.current}.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐇 No more hunting #rad-ui-theme-container by name,
The ThemeContext whispers, "I know the right frame!"
A ref holds the root, a flag says "I'm here,"
The portal blooms only once the path is clear.
Less querying DOM, more context in sight —
The rabbit hops on with everything right! 🌸

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing the combobox portal to render content within the Theme scope.
Linked Issues check	✅ Passed	The PR addresses issue #1100 by implementing context-based portal root resolution instead of querySelector, ensuring portals render within the Theme scope.
Out of Scope Changes check	✅ Passed	All changes are focused on the ComboboxPrimitivePortal component to resolve portal root via ThemeContext, directly addressing the linked issue requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-1100-combobox-portal-theme

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[github-actions]

Coverage

This report compares the PR with the base branch. "Δ" shows how the PR affects each metric.

Metric	PR	Δ
Statements	75.73%	+0.00%
Branches	59.18%	+0.01%
Functions	61.75%	+0.00%
Lines	77.27%	+0.01%

Coverage improved or stayed the same. Great job!

Run npm run coverage:ci locally for detailed reports and target untested areas to raise these numbers.

[kotAPI]

Code review

LGTM. Matches project patterns for portal Theme refs, Floating UI prop merge, controlled-switch/lazy-mount/RTL tests, or focused bug fixes. No changes requested.