Fix bug 406596 (Link/anchor elements are focused within an contentEditable element) for designMode. r/sr=jst.

git-svn-id: svn://10.0.0.236/trunk@246526 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/html/content/src/nsGenericHTMLElement.cpp

@@ -3111,6 +3111,16 @@ nsGenericHTMLElement::RemoveFocus(nsPresContext *aPresContext)
 PRBool
 nsGenericHTMLElement::IsFocusable(PRInt32 *aTabIndex)
 {
+  nsIDocument *doc = GetCurrentDoc();
+  if (!doc || doc->HasFlag(NODE_IS_EDITABLE)) {
+    // In designMode documents we only allow focusing the document.
+    if (aTabIndex) {
+      *aTabIndex = -1;
+    }
+
+    return PR_FALSE;
+  }
+
   PRInt32 tabIndex = 0;   // Default value for non HTML elements with -moz-user-focus
   GetTabIndex(&tabIndex);