Pasting in verbatim string doesn't properly escape double quotes

Paste the following in a verbatim string:

```csharp
var lambda = [SuppressMessage("", "CA2013")] () => Object.ReferenceEquals(1, 2);
```

It gets pasted as:

```csharp
var lambda = [SuppressMessage(", ""CA2013"")] () => Object.ReferenceEquals(1, 2);
```

Expected:

```csharp
var lambda = [SuppressMessage("""", ""CA2013"")] () => Object.ReferenceEquals(1, 2);
```