bug fix : expand all leaf nodes in root level

[wkmyws]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
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🔗 Related issue link

#47552

💡 Background and solution

使用DirectoryTree且multiple = true的时候，当treeData的isLeaf都为true，defaultExpandAll为false，按住shift连续多选会报错

因为initExpandedKeys在这个情况下是undefined，而事实上，对于第一层的叶子节点（root leaf nodes），应该把它们的key加入到initExpandedKeys列表中

📝 Changelog

Language	Changelog
🇺🇸 English	Fix the issue of holding down shift and continuously selecting multiple errors when using DirectoryTree
🇨🇳 Chinese	修复使用DirectoryTree时，按住shift连续多选报错的问题

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[github-actions]

👁 Visual Regression Report for PR #47567 Passed ✅

🎯 Target branch: master (53b0106)
📖 View Full Report ↗︎

🎊 Congrats! No visual-regression diff found.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 99.98%. Comparing base (cebe217) to head (2e56862).

❗ Current head 2e56862 differs from pull request most recent head 25ec3f8. Consider uploading reports for the commit 25ec3f8 to get more accurate results

Files	Patch %	Lines
components/tree/DirectoryTree.tsx	77.77%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master   #47567      +/-   ##
===========================================
- Coverage   100.00%   99.98%   -0.02%     
===========================================
  Files          734      734              
  Lines        12890    12600     -290     
  Branches      3440     3299     -141     
===========================================
- Hits         12890    12598     -292     
- Misses           0        2       +2     

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[yoyo837]

我加的fix不对吗？这个PR不能修复那个问题？

[wkmyws]

我加的fix不对吗？这个PR不能修复那个问题？

额，你加的fix在哪，有链接我看看吗

[yoyo837]

[wkmyws]

懂你意思了，我一开始以为你已经提了一个pr。

因为我直接基于第一个版本加了change log，没注意你后来加了文字"fix"，抱歉，你再加上去吧😊

[yoyo837]

我加到这里一样的

[yoyo837]

请添加测试用例

[wkmyws]

请添加测试用例

已添加测试用例

[github-actions]

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