Relative line numbers

[Opisek]

Would it be possible to add an option to make the line numbers relative? Assuming In the following example that I'm at line 5, it would look like this:

1 Example
2
3 Normal line numbers
4
5 I'm here right now
6
7

  4 Example
  3
  2 Relative line numbers
  1
5   I'm here right now
  1
  2

If you feel like this would be a nice addition but prefer not to implement it yourself, I could look into opening a pull request.

[FelisDiligens]

Joplin uses CodeMirror 5. (5.65.9)
There's a closed issue with relevant code, that I found here: codemirror/codemirror5#4116
Perhaps we could start with that? I'm busy at the moment, so if you want to take a shot at it, I'd be happy to merge a PR.

[FelisDiligens]

I added relative line numbers in v1.1.0

[Opisek]

Works great, thanks a lot!