Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Display/Source/ScrollToTopProxyView.swift

@@ -0,0 +1,50 @@
+import UIKit
+import AsyncDisplayKit
+
+class ScrollToTopView: UIScrollView, UIScrollViewDelegate {
+    var action: (() -> Void)?
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        
+        self.isOpaque = false
+        self.backgroundColor = .clear
+        self.delegate = self
+        self.scrollsToTop = true
+        if #available(iOSApplicationExtension 11.0, iOS 11.0, *) {
+            self.contentInsetAdjustmentBehavior = .never
+        }
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override var frame: CGRect {
+        didSet {
+            let frame = self.frame
+            self.contentSize = CGSize(width: frame.width, height: frame.height + 1.0)
+            self.contentOffset = CGPoint(x: 0.0, y: 1.0)
+        }
+    }
+    
+    @objc func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
+        if let action = self.action {
+            action()
+        }
+        
+        return false
+    }
+}
+
+class ScrollToTopNode: ASDisplayNode {
+    init(action: @escaping () -> Void) {
+        super.init()
+        
+        self.setViewBlock({
+            let view = ScrollToTopView(frame: CGRect())
+            view.action = action
+            return view
+        })
+    }
+}