REGRESSION(r99076): WebKit pastes the trailing newline into a single-line text field

LayoutTests/resources/dump-as-markup.js

 /**
  * There are three basic use cases of dumpAsMarkup
  *
  * 1. Dump the entire DOM when the page is loaded
  *    When this script is included but no method of Markup is called,
  *    it dumps the DOM of each frame loaded.
  *
  * 2. Dump the content of a specific element when the page is loaded
  *    When Markup.setNodeToDump is called with some element or the id of some element,
  *    it dumps the content of the specified element as supposed to the entire DOM tree.
@@ skipping 108 matching lines @@
         layoutTestController.notifyDone();
 }
 
 Markup.useHTML5libOutputFormat = function()
 {
     Markup._useHTML5libOutputFormat = true;
 }
 
 Markup.get = function(node)
 {
+    var markup = Markup._getShadowHostIfPossible(node, 0);
+    if (markup)
+        return markup.substring(1);
+
     if (!node.firstChild)
         return '| ';
 
     // Don't print any markup for the root node.
-    var markup = '';
-    for (var i = 0, len = node.childNodes.length; i < len; i++) {
+    for (var i = 0, len = node.childNodes.length; i < len; i++)
         markup += Markup._get(node.childNodes[i], 0);
-    }
     return markup.substring(1);
 }
 
 // Returns the markup for the given node. To be used for cases where a test needs
 // to get the markup but not clobber the whole page.
 Markup._get = function(node, depth)
 {
     var str = Markup._indent(depth);
 
     switch (node.nodeType) {
@@ skipping 73 matching lines @@
     }
 
     for (var i = 0, len = node.childNodes.length; i < len; i++) {
         var selection = Markup._getSelectionMarker(node, i);
         if (selection)
             str += Markup._indent(depth + 1) + selection;
 
         str += Markup._get(node.childNodes[i], depth + 1);
     }
 
-    if (!Markup._useHTML5libOutputFormat && node.nodeType == Node.ELEMENT_NODE && window.internals) {
-        var root = window.internals.shadowRoot(node);
-        if (root)
-            str += Markup._get(root, depth + 1);
-    }
+    str += Markup._getShadowHostIfPossible(node, depth);
     
     var selection = Markup._getSelectionMarker(node, i);
     if (selection)
         str += Markup._indent(depth + 1) + selection;
 
     return str;
 }
 
+Markup._getShadowHostIfPossible = function (node, depth)
+{
+    if (!Markup._useHTML5libOutputFormat && node.nodeType == Node.ELEMENT_NODE && window.internals) {
+        var root = window.internals.shadowRoot(node);
+        if (root)
+            return Markup._get(root, depth + 1);
+    }
+    return '';
+}
+
 Markup._namespace = function(node)
 {
     if (Markup._NAMESPACE_URI_MAP[node.namespaceURI])
         return Markup._NAMESPACE_URI_MAP[node.namespaceURI] + ' ';
     return '';
 }
 
 Markup._dumpCalls = 0
 
 Markup._indent = function(depth)
@@ skipping 89 matching lines @@
             return Markup._SELECTION_CARET;
         else
             return Markup._SELECTION_ANCHOR;
     } else if (index == sel.focusOffset && node == sel.focusNode)
         return Markup._SELECTION_FOCUS;
 
     return '';
 }
 
 window.addEventListener('load', Markup.notifyDone, false);