[ASRangeController] Don't bother asking UIKit for the visible index paths if view is zero-sized, as it triggers a reloadData.

AsyncDisplayKit/ASCollectionView.mm

@@ -867,7 +867,10 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
 - (NSArray *)visibleNodeIndexPathsForRangeController:(ASRangeController *)rangeController
 {
   ASDisplayNodeAssertMainThread();
-  return [self indexPathsForVisibleItems];
+  // Calling visibleNodeIndexPathsForRangeController: will trigger UIKit to call reloadData if it never has, which can result
+  // in incorrect layout if performed at zero size.  We can use the fact that nothing can be visible at zero size to return fast.
+  BOOL isZeroSized = CGRectEqualToRect(self.bounds, CGRectZero);
+  return isZeroSized ? @[] : [self indexPathsForVisibleItems];
 }
 
 - (CGSize)viewportSizeForRangeController:(ASRangeController *)rangeController

AsyncDisplayKit/ASTableView.mm

@@ -718,6 +718,12 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
 {
   ASDisplayNodeAssertMainThread();
   
+  // Calling indexPathsForVisibleRows will trigger UIKit to call reloadData if it never has, which can result
+  // in incorrect layout if performed at zero size.  We can use the fact that nothing can be visible at zero size to return fast.
+  if (CGRectEqualToRect(self.bounds, CGRectZero)) {
+    return @[];
+  }
+  
   NSArray *visibleIndexPaths = self.indexPathsForVisibleRows;
   
   if (_pendingVisibleIndexPath) {

AsyncDisplayKit/Details/ASRangeController.mm

@@ -149,6 +149,17 @@ static UIApplicationState __ApplicationState = UIApplicationStateActive;
     return;
   }
   
+  // allNodes is a 2D array: it contains arrays for each section, each containing nodes.
+  NSArray<NSArray *> *allNodes = [_dataSource completedNodes];
+  NSUInteger numberOfSections = [allNodes count];
+  
+  if (_allPreviousIndexPaths.count == 0 && allNodes.count == 0) {
+    // In certain cases, such as on app suspend, an update may be triggered before we've loaded anything.
+    // For example, an ASCollectionNode inside another scrollable area will not load content until it has entered
+    // the display range, but the object may have been allocated by a cell and added to the set of active range controllers.
+    return;
+  }
+  
   // TODO: Consider if we need to use this codepath, or can rely on something more similar to the data & display ranges
   // Example: ... = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeVisible];
   NSArray<NSIndexPath *> *visibleNodePaths = [_dataSource visibleNodeIndexPathsForRangeController:self];
@@ -165,10 +176,6 @@ static UIApplicationState __ApplicationState = UIApplicationStateActive;
     [_layoutController setVisibleNodeIndexPaths:visibleNodePaths];
   }
   
-  // allNodes is a 2D array: it contains arrays for each section, each containing nodes.
-  NSArray<NSArray *> *allNodes = [_dataSource completedNodes];
-  NSUInteger numberOfSections = [allNodes count];
-  
   NSArray<ASDisplayNode *> *currentSectionNodes = nil;
   NSInteger currentSectionIndex = -1; // Set to -1 so we don't match any indexPath.section on the first iteration.
   NSUInteger numberOfNodesInSection = 0;