Remap "o" to behave more like going to a new line in insert-mode

[tim-hilt]

This might be a vim anti-pattern, but I think it could still be very useful:

Imagine writing a bullet-list in a Markdown-document. You write a few bullet-points. When going to a new line by hitting enter the document looks like this:

- Some previous text
- | # <- this is my cursor now

Now you jump to a different location in the document, jump back to the bullet-list and (still in normal-mode) insert a new line to add another bullet point. In regular vim-fashion you hit o to insert a new line. The Markdown-document now looks like this:

- Some previous text
| # <- this is my cursor now

Wouldn't it be great, if o also inserted the dash? Basically o should be equivalent to A<CR> (go to end of line, enter insert mode, add new line). When I manually execute the sequence I get the desired behavior. However mapping the sequence to o just behaves as before.

  "vim.normalModeKeyBindings": [
    {
      "before": ["o"],
      "after": ["A", "<CR>"]
    }
  ]

Why does that not work as expected?