Doing SidewaysArgumentTextobjA multiple times results in weirdness in a JavaScript file

Given code:

``` javascript
fun(foo, bar, baz)
```

Doing outer argument first on `baz` and then again without moving the selection results in:
![](https://s3.amazonaws.com/f.cl.ly/items/3q0p141Y150U34370o0Q/Screen%20Shot%202014-01-21%20at%202.29.06%20PM.png)
