fix: AutoComplete search bug (#2752 #2748)

[lyj0309]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

#2752 #2748

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	fix search panel show
🇨🇳 Chinese	修复搜索时弹列表有时候不显示

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

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

[github-actions]

[codecov]

Codecov Report

Base: 41.59% // Head: 41.59% // No change to project coverage 👍

Coverage data is based on head (1ef8c61) compared to base (bed2028).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2793   +/-   ##
=======================================
  Coverage   41.59%   41.59%           
=======================================
  Files         544      544           
  Lines       25712    25712           
  Branches      260      260           
=======================================
  Hits        10694    10694           
  Misses      14978    14978           
  Partials       40       40           

Impacted Files	Coverage Δ
components/auto-complete/AutoComplete.razor.cs	0.00% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[lyj0309]

@ElderJames 测试过了，并不会出现 “当输入框失去焦点时，下拉菜单无法关闭。”的问题，上次（#2753）是因为这个（#2783）bug没有修复

[ElderJames]

@lyj0309 Thank you, I will review it soon.