Auto addition of #| messes code on "return"

[mcanouil]

This can also happen in other less reproducible situations on save.
Currently, the way #| is not really reliable and most of the time causes issues rather than the opposite.

#| should only be added at the beginning of a new line.

Screen.Recording.2024-04-26.at.17.56.41.mov

[juliasilge]

The handling for #| looks very complicated to me (although part of that is for autocompletion for the YAML options). Maybe some of that could be simplified to instead have an "OnEnter" rule in this file like:

{
    "beforeText": "^\\s*#+\\|",
    "action": { "indent": "none", "appendText": "#| " }
}

This rule results in behavior that is much better.