An attempt to fix the build documentation workflow that's failing on main.

### Description

Hotfix to fix mistakenly broken editing capabilities for inserting or deleting new lines.

Updates the layout pass to correctly detect new lines, and if a new one is laid out, continues to layout lines after that line.

Eg:
```
1
2 <- Insert "\n"
3
```
Before:
```
[visible text]
1
2 <- Layout invalidated
3 <- Layout _NOT_ invalidated, missing new line.
```
Now:
```
[visible text]
1
2 <- Layout invalidated
  <- Layout invalidated
3 <- Layout invalidated
```

Adds a new test case for this.

### Related Issues

### Checklist

- [x] I read and understood the [contributing guide](https://github.com/CodeEditApp/CodeEdit/blob/main/CONTRIBUTING.md) as well as the [code of conduct](https://github.com/CodeEditApp/CodeEdit/blob/main/CODE_OF_CONDUCT.md)
- [x] The issues this PR addresses are related to each other
- [x] My changes generate no new warnings
- [x] My code builds and runs on my machine
- [x] My changes are all related to the related issue above
- [x] I documented my code

### Screenshots