Commits on Feb 8, 2021

1. Don't shift interleaved updates to separate lane …

   Now that interleaved updates are added to a special queue, we no longer
   need to shift them into their own lane. We can add to a lane that's
   already in the middle of rendering without risk of tearing.
   
   See facebook#20615 for more background.
   
   I've only changed this in the new fork, and only behind the
   enableTransitionEntanglements flag.
   
   Most of this commit involves updating tests. The "shift-to-a-new" lane
   trick was intentionally used in a handful of tests where two or more
   updates need to be scheduled in different lanes. Most of these tests
   were written before `startTransition` existed, and all of them were
   written before transitions were assigned arbitrary lanes.
   
   So I ported these tests to use `startTransition` instead, which is the
   idiomatic way to mark an update as parallel.
   
   I didn't change the old fork at all. Writing these tests in such a way
   that they also pass in the old fork actually revealed a few flaws in the
   current implementation regarding interrupting a suspended refresh
   transition early, which is a good reminder that we should be writing our
   tests using idiomatic patterns as much as we possibly can.

   

   acdlite committed Feb 8, 2021
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