Commits on Oct 17, 2023

1. Prerendering support for useDeferredValue …

   Revealing a prerendered tree (hidden -> visible) is considered the same
   as mounting a brand new tree. So, when an initialValue argument is
   passed to useDeferredValue, and it's prerendered inside a hidden tree,
   we should first prerender the initial value.
   
   After the initial value has been prerendered, we switch to prerendering
   the final one. This is the same sequence that we use when mounting new
   visible tree. Depending on how much prerendering work has been finished
   by the time the tree is revealed, we may or may not be able to skip all
   the way to the final value.
   
   This means we get the benefits of both prerendering and preview states:
   if we have enough resources to prerender the whole thing, we do that.
   If we don't, we have a preview state to show for immediate feedback.

   

   acdlite committed Oct 17, 2023
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