Update <select> when any of its <option> children has "display: none"

Source/core/html/HTMLOptGroupElement.cpp

Index: Source/core/html/HTMLOptGroupElement.cpp
diff --git a/Source/core/html/HTMLOptGroupElement.cpp b/Source/core/html/HTMLOptGroupElement.cpp
index d9f835b0faf0c1bed924df7183c59ed7dc6dc81b..8725226c8a996c4f7b75e7df904d4e99b0279fe3 100644
--- a/Source/core/html/HTMLOptGroupElement.cpp
+++ b/Source/core/html/HTMLOptGroupElement.cpp
@@ -96,7 +96,12 @@ void HTMLOptGroupElement::detach(const AttachContext& context)
 
 void HTMLOptGroupElement::updateNonRenderStyle()
 {
+    bool oldDisplayNoneStatus = isDisplayNone();
     m_style = originalStyleForRenderer();
+    if (oldDisplayNoneStatus != isDisplayNone()) {
+        if (HTMLSelectElement* select = ownerSelectElement())
+            select->updateListOnRenderer();
+    }
 }
 
 RenderStyle* HTMLOptGroupElement::nonRendererStyle() const
@@ -135,4 +140,10 @@ void HTMLOptGroupElement::accessKeyAction(bool)
         select->accessKeyAction(false);
 }
 
+bool HTMLOptGroupElement::isDisplayNone() const
+{
+    RenderStyle* style = nonRendererStyle();
+    return style && style->display() == NONE;
+}
+
 } // namespace