## Summary
Closes#53570
- `o` and `O` in normal mode were unconditionally copying the current
line's indentation into the new line, ignoring the `auto_indent` setting
entirely
- When `auto_indent: "none"` is set, new lines created by `o`/`O` now
start at column 0 as expected
- When `auto_indent` is `preserve_indent` or `syntax_aware`, behavior is
unchanged
The fix reads `language_settings_at` for the relevant row and splits
edits into two paths: `editor.edit()` (no autoindent) for `None`, and
`editor.edit_with_autoindent()` for everything else — mirroring the
approach already used by the non-vim `Newline` action.
## Test plan
- Added `test_o_auto_indent_none`: verifies `o`/`O` produce column-0
lines with `auto_indent: "none"`, including edge cases (first line,
empty line)
- Added `test_o_preserve_indent`: verifies `o`/`O` copy the current
line's indentation with `auto_indent: "preserve_indent"` (regression
guard)
- Existing neovim-backed tests (`test_o`, `test_insert_line_above`,
`test_o_comment`) continue to pass
Release Notes:
- Fixed vim `o`/`O` commands ignoring the `auto_indent: "none"` setting,
causing new lines to inherit indentation instead of starting at column 0