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c73e1f236f
Given this snippet:
```jsx
TestRenderer.act(() => {
TestUtils.act(() => {
TestRenderer.create(<Effecty />);
});
});
```
We want to make sure that all work is only flushed on exiting the outermost act().
Now, naively doing this based on actingScopeDepth would work with a mocked scheduler, where flushAll() would flush all work across renderers.
This doesn't work without mocking the scheduler though; and where flushing work only works per renderer. So we disable this behaviour for a non-mocked scenario. This seems like an ok tradeoff.