Make textContent trigger single DOMSubtreeModified event

Source/core/dom/ContainerNode.cpp

Index: Source/core/dom/ContainerNode.cpp
diff --git a/Source/core/dom/ContainerNode.cpp b/Source/core/dom/ContainerNode.cpp
index e9864bcd16ca9fb5d54ccd980cf004b0762e994c..a32170921d2e808f9d7a662629e228bcad14a1cb 100644
--- a/Source/core/dom/ContainerNode.cpp
+++ b/Source/core/dom/ContainerNode.cpp
@@ -618,7 +618,7 @@ void ContainerNode::parserRemoveChild(Node& oldChild)
 
 // This differs from other remove functions because it forcibly removes all the children,
 // regardless of read-only status or event exceptions, e.g.
-void ContainerNode::removeChildren()
+void ContainerNode::removeChildren(bool sendModifiedEvent)
 {
     if (!m_firstChild)
         return;
@@ -674,7 +674,7 @@ void ContainerNode::removeChildren()
     // We don't fire the DOMSubtreeModified event for Attr Nodes. This matches the behavior

[sof, 2014/11/20 12:09:59]

Move this comment to Attr::setValue()

     // of IE and Firefox. This event is fired synchronously and is a source of trouble for
     // attributes as the JS callback could alter the attributes and leave us in a bad state.
-    if (!isAttributeNode())
+    if (sendModifiedEvent)
         dispatchSubtreeModifiedEvent();
 }