Copy to clipboard feature also adding line numbers

[megasanjay]

Describe the bug

This is an issue with the Vitepress alpha version. We have some code blocks with line numbers enabled in markdown. It would appear that using the copy to clipboard button is also somehow grabbing the line numbers along with it.

Reproduction

Attaching our docs link here: https://dev.fairdataihub.org/docs/README.html#tech-stack
You can click on the copy to clipboard button to try it out

Expected behavior

Only the code block content should be copied.

System Info

System:
    OS: Windows 10 10.0.22000
    CPU: (20) x64 Intel(R) Core(TM) i9-10900K CPU @ 3.70GHz
    Memory: 16.33 GB / 31.81 GB
  Binaries:
    Node: 16.14.2 - ~\anaconda3\envs\nuxt-env\node.EXE
    Yarn: 1.22.11 - ~\anaconda3\envs\nuxt-env\yarn.CMD
    npm: 8.12.2 - ~\Desktop\fairdataihub-docs\node_modules\.bin\npm.CMD
  Browsers:
    Edge: Spartan (44.22000.120.0), Chromium (103.0.1264.37)
    Internet Explorer: 11.0.22000.120
  npmPackages:
    vitepress: 1.0.0-alpha.4 => 1.0.0-alpha.4

Not sure if these are correct since I'm on windows 11...

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[megasanjay]

Added a PR that fixes this issue in #886