[ASRangeController] Ensure that even if the collection view layout is inconsistent, it is impossible for a visible item to not be in the display range.

AsyncDisplayKit/AsyncDisplayKit+Debug.h

@@ -6,9 +6,19 @@
 //  Copyright © 2016 Facebook. All rights reserved.
 //
 
-#import <Foundation/Foundation.h>
+#import "ASControlNode.h"
 #import "ASImageNode.h"
 
+@interface ASControlNode (Debugging)
+
+/**
+ Class method to enable a visualization overlay of the tapable area on the ASControlNode. For app debugging purposes only.
+ @param enable Specify YES to make this debug feature enabled when messaging the ASControlNode class.
+ */
++ (void)setEnableHitTestDebug:(BOOL)enable;
+
+@end
+
 @interface ASImageNode (Debugging)
 
 /**
@@ -20,4 +30,4 @@
 + (void)setShouldShowImageScalingOverlay:(BOOL)show;
 + (BOOL)shouldShowImageScalingOverlay;
 
-@end
+@end