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feat(table): Add new 'single' table mode (#15672 )

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closes #15381

# Description
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Adds a new table mode called `single`, it looks like the `heavy` mode,
but the key difference is that it uses thinner lines. I decided on the
name `single` because it's one of the border styles Neovim uses, and
they look practically the same.

# User-Facing Changes
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New config option:

```nushell
$env.config.table.mode = 'single'
```

# Tests + Formatting
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Added new tests in `crates/nu-table/tests/style.rs` to cover the single
table mode.

# After Submitting
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2025-05-01 15:30:57 -05:00

examples

nu-table/ 1 refactoring + a few optimizations + small fix (#15653 )

2025-05-01 09:43:30 -05:00

src

feat(table): Add new 'single' table mode (#15672 )

2025-05-01 15:30:57 -05:00

tests

feat(table): Add new 'single' table mode (#15672 )

2025-05-01 15:30:57 -05:00

.gitignore

Remove old nushell/merge engine-q