Change return value of getRootElement() from element with specific id to document.body element

[sungik-choi]

Self Checklist

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• I wrote a commit message in English.
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Related Issue

Fixes #1042, Fixes #773

Summary

getRootElement() 함수의 반환값을 특정 id를 가진 엘리먼트(e.g. main)에서 document.body 엘리먼트로 변경합니다.

Details

• Change return value of getRootElement() from element with specific id to document.body element #1042 를 참고해주세요.
• 로컬 빌드 후 데스크 어플리케이션에서 테스트해봤을 시 문제 없이 동작했습니다. (100% 검증되진 않음)

Breaking change or not (Yes/No)

Yes

References

없음

[changeset-bot]

🦋 Changeset detected

Latest commit: c11a611

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@channel.io/bezier-react	Minor
bezier-figma-plugin	Patch

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[codecov]

Codecov Report

Base: 71.20% // Head: 71.19% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (c11a611) compared to base (74ac5ed).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           next-v1    #1048      +/-   ##
===========================================
- Coverage    71.20%   71.19%   -0.01%     
===========================================
  Files          208      208              
  Lines         2980     2979       -1     
  Branches       823      822       -1     
===========================================
- Hits          2122     2121       -1     
  Misses         739      739              
  Partials       119      119              

Impacted Files	Coverage Δ
packages/bezier-react/src/utils/domUtils.ts	100.00% <100.00%> (ø)

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[github-actions]

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[Dogdriip]

👍 body가 없는 경우도 있을지 찾아보았는데 그런 상황은 거의 없을 것 같네요.

• https://developer.mozilla.org/en-US/docs/Web/API/Document/body
• https://html.spec.whatwg.org/multipage/dom.html#dom-document-body-dev