Fix for input/datalist failure when datalist is created outside document

Source/core/html/HTMLInputElement.cpp

Index: Source/core/html/HTMLInputElement.cpp
diff --git a/Source/core/html/HTMLInputElement.cpp b/Source/core/html/HTMLInputElement.cpp
index 9078c6e92d0555b5ccb433fdd73498f4ec333548..1e371767cbe90be9dddca634519ce910bddf26c9 100644
--- a/Source/core/html/HTMLInputElement.cpp
+++ b/Source/core/html/HTMLInputElement.cpp
@@ -1438,7 +1438,7 @@ Node::InsertionNotificationRequest HTMLInputElement::insertedInto(ContainerNode*
     if (insertionPoint->inDocument() && !form())
         addToRadioButtonGroup();
     resetListAttributeTargetObserver();
-    return InsertionDone;
+    return InsertionShouldCallDidNotifySubtreeInsertions;
 }
 
 void HTMLInputElement::removedFrom(ContainerNode* insertionPoint)
@@ -1886,4 +1886,9 @@ bool HTMLInputElement::shouldDispatchFormControlChangeEvent(String& oldValue, St
     return m_inputType->shouldDispatchFormControlChangeEvent(oldValue, newValue);
 }
 
+void HTMLInputElement::didNotifySubtreeInsertionsToDocument()
+{
+    listAttributeTargetChanged();
+}
+
 } // namespace