Commits on Mar 25, 2021

1. Add experiment to ensure ASCollectionView's range controller updates … …

   …on changeset updates
   
   This experiment makes sure a ASCollectionView's `rangeController` updates when
   a changeset WITH updates is applied. Currently it is possible for nodes
   inserted into the preload range to not get preloaded when performing a batch
   update.
   
   For example, suppose a collection node has:
   - Tuning parameters with a preload range of 1 screenful for the given range
     mode.
   - Nodes A and B where A is visible and B is off screen.
   Currently if node B is deleted and a new node C is inserted in its place, node
   C will not get preloaded until the collection node is scrolled. This is because
   the preloading mechanism relies on a `setNeedsUpdate` call on the range
   controller as part of the `-collectionView:willDisplayCell:forItemAtIndexPath:`
   delegate method when the batch update is submitted. However, in the example
   outlined above, this sometimes doesn't happen automtically, causing the range
   update to be delayed until the next the view scrolls.

   

   rqueue committed Mar 25, 2021
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