Grab a strong reference for asyncDataSource and asyncDelegate in ASCollectionView and ASTableView before executing the range update to be sure they are not going away while executing the range update. This can happen in range updates while going back in the view controller hierarchy
We don't nee CFRunLoopWakeUp as at this time are currently running in an observer callback, and after running all of the BeforeWaiting observers it must surely check for more sources / etc to run before determining if it will sleep
[ASDisplayNode] Placeholders should always be recreated if returning to cleared nodes, and remain until ASNetwork/MultiplexImageNode finish loading their image from the network.
Unclear why the framework target required these seemingly unrelated changes to Collection
classes, but I modeled them after related files and it seems cleaner now (passes tests & framework target)
If previously-displayed contents is gone (e.g. clearContents), and is not finished displaying
by the time the node is onscreen, recreate the placeholder immediately.
It is not guaranteed that the runloop will turn if it has no scheduled work, and this causes processing of the queue to stop. Attaching a custom loop source to the run loop and signal it if new work needs to be done
- Only update range mode if visibility changes if the node is not range controlled
- Only change explicitly set range mode if ASRangeController becomes visible
- Return interface state for range controller in ASCollectionView and ASTableView based on if the containing node is range managed
This should fix a deadlock in ASDisplayNode and it's caused by displayWillStart: and where one thread is recursing down the tree and another thread is recursing up the tree. We remove the lock in _pendingDisplayNodes for the property, but need to guarantee that we only modify the _pendingDisplayNodes state on the main thread.
Furthermore add documentation on what thread displayWillStart and displayDidFinish will be called
- optimized ASRecursivelyFindIndexPathsForMultidimensionalArray() to remove enumerateUsingBlock:
- replaced single project call to ASIndexPathsForMultidimensionalArray() in ASRangeController with ASIndexPathsForTwoDimensionalArray()
`ASRunLoopQueue` was added in #1341 and declared as a public header. However, it was not added to the umbrella header. As-is, when consumers integrate `1.9.7`, the framework will not compile with the error:
```
Umbrella header for module 'AsyncDisplayKit' does not include header 'ASDisplayNode+Beta.h'
```
