BenchmarkApp crash

[Kyle-Ye]

Looks like this bug is happening after #373.

Confirmed to be introduced by #373.

_TestApp's ContentView will call AnyView(base.safeAreaInsets(.zero, next: nil))

And safeAreaInsets will use padding.

The _PaddingLayout used to be a terminal node and stop the later process.

After it was implemented, the bug was then exposed.

[Kyle-Ye]

The root cause is the same as #87 which is fixed recently.