Option Groups with display: none should not show the children option elements

Source/core/html/HTMLSelectElement.cpp

Index: Source/core/html/HTMLSelectElement.cpp
diff --git a/Source/core/html/HTMLSelectElement.cpp b/Source/core/html/HTMLSelectElement.cpp
index f6ecf4f839dcf973bdfd7731b2e537ae8f922f4f..4c5912ebe506342dc1fb009125e0644c41a929d8 100644
--- a/Source/core/html/HTMLSelectElement.cpp
+++ b/Source/core/html/HTMLSelectElement.cpp
@@ -36,6 +36,7 @@
 #include "core/dom/Attribute.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeListsNodeData.h"
+#include "core/dom/NodeRenderStyle.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/events/GestureEvent.h"
 #include "core/events/KeyboardEvent.h"
@@ -536,6 +537,10 @@ int HTMLSelectElement::nextValidIndex(int listIndex, SkipDirection direction, in
         HTMLElement* element = listItems[listIndex];
         if (!isHTMLOptionElement(*element))
             continue;
+        if (RenderStyle* style = element->renderStyle() ? element->renderStyle() : element->computedStyle()) {
+            if (style->display() == NONE)
+                continue;
+        }
         if (element->isDisabledFormControl())
             continue;
         if (!usesMenuList() && !element->renderer())