Add assertion for ASDisplayNode is layer backed if using ASInterfaceStateForDisplayNode

AsyncDisplayKit/ASCollectionView.mm

@@ -1137,7 +1137,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
     [node __exitHierarchy];
   }
 
-  // Updating the visible node index paths only for range managed nodes. Not range managed nodes will get their
+  // Updating the visible node index paths only for not range managed nodes. Range managed nodes will get their
   // their update in the layout pass
   if (![node supportsRangeManagedInterfaceState]) {
     [_rangeController visibleNodeIndexPathsDidChangeWithScrollDirection:self.scrollDirection];

AsyncDisplayKit/ASDisplayNodeExtras.mm

@@ -12,8 +12,11 @@
 
 extern ASInterfaceState ASInterfaceStateForDisplayNode(ASDisplayNode *displayNode, UIWindow *window)
 {
+    ASDisplayNodeCAssert(![displayNode isLayerBacked], @"displayNode must not be layer backed as it may have a nil window");
     if (displayNode && [displayNode supportsRangeManagedInterfaceState]) {
-        // Only use the interfaceState of nodes that are range managed
+        // Directly clear the visible bit if we are not in a window. This means that the interface state is,
+        // if not already, about to be set to invisible as it is not possible for an element to be visible
+        // while outside of a window.
         ASInterfaceState interfaceState = displayNode.interfaceState;
         return (window == nil ? (interfaceState &= (~ASInterfaceStateVisible)) : interfaceState);
     } else {

AsyncDisplayKit/ASTableView.mm

@@ -1069,7 +1069,7 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
     [node __exitHierarchy];
   }
 
-  // Updating the visible node index paths only for range managed nodes. Not range managed nodes will get their
+  // Updating the visible node index paths only for not range managed nodes. Range managed nodes will get their
   // their update in the layout pass
   if (![node supportsRangeManagedInterfaceState]) {
     [_rangeController visibleNodeIndexPathsDidChangeWithScrollDirection:self.scrollDirection];

AsyncDisplayKit/Details/ASRangeControllerUpdateRangeProtocol+Beta.h

@@ -12,20 +12,6 @@
 #import "ASCollectionNode.h"
 #import "ASTableNode.h"
 
-/**
- * Update the range mode for a range controller to a explicitly set range mode until the node that contains the range
- * controller becomes visible again
- *
- * Logic for the automatic range mode:
- * 1. If there are no visible node paths available nothing is to be done and no range update will happen
- * 2. The initial range update if the range controller is visible always will be ASLayoutRangeModeCount
- *    (ASLayoutRangeModeMinimum) as it's the initial fetch
- * 3. The range mode set explicitly via updateCurrentRangeWithMode: will last at least one range update. After that it
-      the range controller will use the explicit set range mode until it becomes visible and a new range update was
-      triggered or a new range mode via updateCurrentRangeWithMode: is set
- * 4. If range mode is not explicitly set the range mode is variying based if the range controller is visible or not
- */
-
 
 @protocol ASRangeControllerUpdateRangeProtocol <NSObject>
 
@@ -48,7 +34,19 @@
 
 @interface ASRangeController (ASRangeControllerUpdateRangeProtocol) <ASRangeControllerUpdateRangeProtocol>
 
-/// This is a way for a one way update of range with a given mode.
+/**
+ * Update the range mode for a range controller to a explicitly set mode until the node that contains the range
+ * controller becomes visible again
+ *
+ * Logic for the automatic range mode:
+ * 1. If there are no visible node paths available nothing is to be done and no range update will happen
+ * 2. The initial range update if the range controller is visible always will be ASLayoutRangeModeCount
+ *    (ASLayoutRangeModeMinimum) as it's the initial fetch
+ * 3. The range mode set explicitly via updateCurrentRangeWithMode: will last at least one range update. After that it
+      the range controller will use the explicit set range mode until it becomes visible and a new range update was
+      triggered or a new range mode via updateCurrentRangeWithMode: is set
+ * 4. If range mode is not explicitly set the range mode is variying based if the range controller is visible or not
+ */
 - (void)updateCurrentRangeWithMode:(ASLayoutRangeMode)rangeMode;
 
 @end