overflow-y: hidden areas can still be scrolled vertically

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 66f69da739efb2b2e5f3a5767ab01d4d59e8b263..7a7de9483daff075984f9f5ad0f951f46cdecc54 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -731,7 +731,18 @@ bool RenderBox::canBeScrolledAndHasScrollableArea() const
 
 bool RenderBox::canBeProgramaticallyScrolled() const
 {
-    return (hasOverflowClip() && (scrollsOverflow() || (node() && node()->rendererIsEditable()))) || (node() && node()->isDocumentNode());
+    Node* node = this->node();
+    if (node && node->isDocumentNode())
+        return true;
+
+    if (!hasOverflowClip())
+        return false;
+
+    bool hasScrollableOverflow = hasScrollableOverflowX() || hasScrollableOverflowY();
+    if (scrollsOverflow() && hasScrollableOverflow)
+        return true;
+
+    return node && node->rendererIsEditable();
 }
 
 bool RenderBox::usesCompositedScrolling() const