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

LayoutTests/resources/dump-as-markup.js

Index: LayoutTests/resources/dump-as-markup.js
===================================================================
--- LayoutTests/resources/dump-as-markup.js	(revision 109010)
+++ LayoutTests/resources/dump-as-markup.js	(working copy)
@@ -126,14 +126,16 @@
 
 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);
 }
 
@@ -227,11 +229,7 @@
         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)
@@ -240,6 +238,16 @@
     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])