Bold and Italic style get stuck when applied on a selection having content with mixed editability

LayoutTests/editing/editing.js

Index: LayoutTests/editing/editing.js
diff --git a/LayoutTests/editing/editing.js b/LayoutTests/editing/editing.js
index 14af90572c54f5167d3dd93551b4ba1a8781ffd7..8f4e3d22b0709ed720a2c2a5c93af1690a25b439 100644
--- a/LayoutTests/editing/editing.js
+++ b/LayoutTests/editing/editing.js
@@ -904,7 +904,7 @@ function runEditingTest() {
 }
 
 var dumpAsText = false;
-var markupResultList = document.createElement('ol');
+var elementsForDumpingMarkupList = [document.createElement('ol')];
 
 function runDumpAsTextEditingTest(enableCallbacks) {
     if (window.testRunner) {
@@ -920,17 +920,26 @@ function runDumpAsTextEditingTest(enableCallbacks) {
     selection.setPosition(elem, 0);
     editingTest();
 
-    document.body.appendChild(markupResultList);
+    for (var i = 0; i < elementsForDumpingMarkupList.length; i++)
+        document.body.appendChild(elementsForDumpingMarkupList[i]);
 }
 
 function debugForDumpAsText(name) {
     if (dumpAsText && document.getElementById("root")) {
         var newItem = document.createElement('li');
         newItem.appendChild(document.createTextNode(name+": "+document.getElementById("root").innerHTML));
-        markupResultList.appendChild(newItem);
+        elementsForDumpingMarkupList[elementsForDumpingMarkupList.length - 1].appendChild(newItem);
     }
 }
 
+function startNewMarkupGroup(label) {
+    if (!elementsForDumpingMarkupList[elementsForDumpingMarkupList.length - 1].hasChildNodes())
+        elementsForDumpingMarkupList.pop();
+    elementsForDumpingMarkupList.push(document.createElement('br'));
+    elementsForDumpingMarkupList.push(document.createTextNode(label));
+    elementsForDumpingMarkupList.push(document.createElement('ol'));
+}
+
 //-------------------------------------------------------------------------------------------------------