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c492f97541
This is a follow up to https://github.com/facebook/react/pull/32069 In the prior change I updated Fizz to allow you to render Suspense boundaries at any level within a react-dom application by treating the document body as the default render scope. This change updates Fiber to provide similar semantics. Note that this update still does not deliver hydration so unifying the Fizz and Fiber implementations in a single App is not possible yet. The implementation required a rework of the getHostSibling and getHostParent algorithms. Now most HostSingletons are invisible from a host positioning perspective. Head is special in that it is a valid host scope so when you have Placements inside of it, it will act as the parent. But body, and html, will not directly participate in host positioning. Additionally to support flipping to a fallback html, head, and body tag in a Suspense fallback I updated the offscreen hiding/unhide logic to pierce through singletons when lookin for matching hidable nod boundaries anywhere (excluding hydration)