Commits on Jul 1, 2021

1. Replace unbatchedUpdates with flushSync …

   There's a weird quirk leftover from the old Stack (pre-Fiber)
   implementation where the initial mount of a leagcy (ReactDOM.render)
   root is flushed synchronously even inside `batchedUpdates`.
   
   The original workaround for this was an internal method called
   `unbatchedUpdates`. We've since added another API that works almost the
   same way, `flushSync`.
   
   The only difference is that `unbatchedUpdates` would not cause other
   pending updates to flush too, only the newly mounted root. `flushSync`
   flushes all pending sync work across all roots. This was to preserve
   the exact behavior of the Stack implementation.
   
   But since it's close enough, let's just use `flushSync`. It's unlikely
   anyone's app accidentally relies on this subtle difference, and the
   legacy API is deprecated in 18, anyway.

   

   acdlite committed Jul 1, 2021
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