鼠标在代码片段中选择代码，鼠标离开代码片段就反选

[allrobot]

Is there an existing issue for this?

• I have searched the existing issues

Can the issue be reproduced with the default theme (daylight/midnight)?

• I was able to reproduce the issue with the default theme

Could the issue be due to extensions?

• I've ruled out the possibility that the extension is causing the problem.

Describe the problem

选择代码的逻辑可能有问题，选择代码时，鼠标稍微离开代码片段就反选，用户必须小心翼翼选择

Expected result

Screenshot or screen recording presentation

预期选择代码时，不会反选，离开距离较大就全选鼠标选中点往上的全部文本

Version environment

- Version: latest
- Operating System: WIN10
- Browser (if used):

Log file

NO

More information

不知道是不是归于bug，还是功能改善的