Fix Indent affecting lines incorrectly

### Which OS are you using?

Windows

### Expected Behaviour

Writing `local ret = Button:new(text, x, y)` and then putting in a new line before text, to change the arguments to a vertical list, un-indents at text. That is, the result is
```
Button:new(
text, x, y)
```

### Actual Behaviour

The result should be
```
Button:new(
text, x, y)
```

### Reproduction steps

- Write a function with an argument
- Break before the argument

### Additional Notes

The behaviour is as expected if Fix Indent is off. However I believe the point is for other cases like strings, to get
```
"I went to a function
the other day"
```

and not

```
"I went to a function
the other day"
```

I'm not exactly sure what the point of the option is. I assume it doesn't apply to every time vscode indents code, but I think the set it's supposed to apply to probably shouldn't apply to the function(arg) case.

### Log

_No response_

Start by reproducing the reported behavior in the VSCode Lua extension with Fix Indent enabled: break before an argument in a Lua function call and compare it with a multiline string. Trace the indentation handling entry point and add coverage for both cases; done means arguments remain indented while string continuation is not incorrectly indented.

Written by the indexing model from the issue text.