fix(pro:search): segment input mousedown doesn't change selection

[sallerli1]

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What is the current behavior?

通过左键将光标移动到输入的起始位置之后，鼠标点击到其他地方，退格键不起作用

原因是mouseDown事件回调没有同步光标位置的数据

What is the new behavior?

修复以上问题

Other information

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[codecov]

Codecov Report

Merging #1612 (b0b9ce2) into main (fdda882) will not change coverage.
The diff coverage is n/a.

❗ Current head b0b9ce2 differs from pull request most recent head 91696db. Consider uploading reports for the commit 91696db to get more accurate results

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  Hits        29198    29198           
  Misses       2344     2344