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

Source/core/html/HTMLOptionElement.cpp

Index: Source/core/html/HTMLOptionElement.cpp
diff --git a/Source/core/html/HTMLOptionElement.cpp b/Source/core/html/HTMLOptionElement.cpp
index a02a889367e73b3afbc50809de3ccd44a1c21b21..d58b7a3bb95e55259dcc8ffebde2e38a130d9d21 100644
--- a/Source/core/html/HTMLOptionElement.cpp
+++ b/Source/core/html/HTMLOptionElement.cpp
@@ -286,6 +286,15 @@ void HTMLOptionElement::setLabel(const AtomicString& label)
 void HTMLOptionElement::updateNonRenderStyle()
 {
     m_style = originalStyleForRenderer();
+    if (m_style->display() != NONE) {
+        HTMLElement* parent = Traversal<HTMLElement>::firstAncestor(*this);
+        ASSERT(parent);
+        if (parent->hasTagName(optgroupTag)) {
+            RenderStyle* parentStyle = parent->renderStyle() ? parent->renderStyle() : parent->computedStyle();
+            if (parentStyle && parentStyle->display() == NONE)
+                m_style->setDisplay(NONE);
+        }
+    }
     if (HTMLSelectElement* select = ownerSelectElement())
         select->updateListOnRenderer();
 }