Mid-argument newlines result in unexpected whitespace

Before:

``` python
self.assertEqual(a or
b)
```

After:

``` python
assert a or \
b)
```

The code still parses, so the bug is simply that the whitespace looks a bit funny. Would likely prefer

``` python
assert a or \
b
```

Start by reproducing the Python examples in the issue and inspect the conversion path that produces the shown assertion formatting. Done means mid-argument newlines no longer leave unexpected indentation, while the converted code remains valid and matches the preferred layout.

Written by the indexing model from the issue text.