Modifiers don't apply to multi-element views correctly.

Comparing the following snippet between Mac and Linux, Mac shows a border around each child, while on Linux a single border is drawn around them together:

```swift
VStack {
    ForEach(1..<5) { i in
        Text("Child \(i)")
    }.border(Color.red)
}
```

The same can be observed when using a view that has multiple top-level children in its `body`.