# Objective

Fixes #57850 

NBSP, NNBSP, and NBH characters were causing breaks when text is wrapped
in editor when they should instead be non-breaking.

## Solution

I looked for an official spec and found [Unicode Line Breaking
Algorithm](https://www.unicode.org/reports/tr14/) which has these
characters listed under the non-breaking ("glue") section. I opted to
add these characters in manually within the logic that checks if a
character is a 'word' character or not, following the pattern for how
other groups of unicode characters are checked.

## Testing

- Tests were added under `test_is_word_char` and `test_wrap_line`
sections, and the expected behavior was verified by building zed and
using these characters in the editor.
- I don't think anything else needs testing now. In the future, it could
make sense to make sure the entire unicode spec is followed for line
breaking, as I imagine there are other obscure characters that could
have this same issue. (a `unicode-linebreak` crate is imported elsewhere
in the codebase but not used here)
- Changes can be tested by building this commit and following the
original instructions outlined in the related issue.
- Tested on linux

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments (**no unsafe
blocks**)
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

## Showcase

<details>
  <summary>Before/After</summary>

### Before
<img width="449" height="443" alt="before"
src="https://github.com/user-attachments/assets/4d438966-1bab-46e4-a018-cd648395a1ca"
/>

### After
<img width="448" height="445" alt="after"
src="https://github.com/user-attachments/assets/c7ce7166-9c22-4083-850f-8d8acfc42b56"
/>


</details>

---

Release Notes:

- N/A