fix: backfill should not affected by mouse

[zombieJ]

resolve ant-design/ant-design#26773

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/react-component/select/doewy5oyn
✅ Preview: https://select-git-fix-backfill.react-component.vercel.app

[codecov]

Codecov Report

Merging #549 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #549   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files          20       20           
  Lines         956      957    +1     
  Branches      311      324   +13     
=======================================
+ Hits          950      951    +1     
  Misses          5        5           
  Partials        1        1           

Impacted Files	Coverage Δ
src/OptionList.tsx	99.16% <100.00%> (+<0.01%)	⬆️
src/generate.tsx	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5bb7de6...8ec2a47. Read the comment docs.