fix: preserve zero-valued overflow indicators

[QDyanbing]

说明

• renderRest={0} 使用指定内容，不再回退到默认剩余项文案。
• 补充零值内容、返回零值的渲染函数及空值回退测试。

验证

• npm test -- --runInBand（43 项通过）
• npm run tsc
• 改动源码 ESLint 检查通过。

关联 ant-design/ant-design#59193

Summary by CodeRabbit

• Bug Fixes
  • 修正剩余项显示逻辑：renderRest 提供可渲染内容（包括 0）时会显示该内容；提供 false、null、undefined 或空字符串时则显示默认文本。
• Tests
  • 新增对上述剩余项显示行为的测试。

[vercel]

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[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: c0f5b895-bb50-4608-ab9a-1eed922accd1

📥 Commits

Reviewing files that changed from the base of the PR and between f1c801c and abe69ac.

📒 Files selected for processing (2)

• src/Overflow.tsx
• tests/renderability.spec.tsx

Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

Overflow 现在仅在 renderRest 是 React 可渲染值时使用该值；否则使用默认剩余项内容。新增测试覆盖 0、返回 0 的函数，以及其他指定值。

Changes

Overflow 剩余项渲染

Layer / File(s)	Summary
剩余项渲染选择 src/Overflow.tsx, tests/renderability.spec.tsx	mergedRenderRest 仅在 renderRest 是 React 可渲染值时使用它，否则使用默认值。测试验证 0 会被渲染，false、null、undefined 和空字符串会显示默认值。类型排版和类型断言写法也有调整。

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to abe69

The overflow indicator now preserves zero-valued content, and the reviewed cases retain the intended fallback behavior. No specific issue remains that should block merging.

Security Architecture Review

Security architecture risk: ⚪ Minimal · up to abe69

The public rendering behavior changes narrowly: a supplied zero now appears instead of the default overflow label. The review found no material security risk introduced by this change.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The changed behavior is bounded to the public Overflow component’s rest-content selection; the inspected render flow adds no sensitive sink.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题“fix: preserve zero-valued overflow indicators”准确概括了主要变更，即保留值为 0 的溢出指示器。标题简洁、具体，并与代码和测试变更一致。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Create a new PR

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_{小兔翻开代码页，
看见零值跳出来。
空值转身走向默认，
测试一行行排开。
新逻辑安稳落地，小兔蹦回草丛来。}

_{Comment @coderabbitai help to get the list of available commands.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (f1c801c) to head (abe69ac).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   97.05%   97.07%   +0.01%     
==========================================
  Files           7        7              
  Lines         340      342       +2     
  Branches      100      102       +2     
==========================================
+ Hits          330      332       +2     
  Misses         10       10              

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