From b78362ef9723d7be2eb48d70b714a200b7c57f37 Mon Sep 17 00:00:00 2001
From: James H <jh.dev0@gmail.com>
Date: Thu, 13 Sep 2012 21:31:53 -0400
Subject: [PATCH] Bug 610713 - Fix popup menus leaving behind artifacts when
 using hardware acceleration and a basic Windows theme. r=jmathies

---
 widget/windows/nsWindow.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
index e86eea3e94f..de54b64b828 100644
--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -481,8 +481,13 @@ nsWindow::Create(nsIWidget *aParent,
   DWORD extendedStyle = WindowExStyle();
 
   if (mWindowType == eWindowType_popup) {
-    if (!aParent)
+    if (!aParent) {
       parent = NULL;
+    }
+
+    if (mPopupType == ePopupTypeMenu && aInitData->mDropShadow) {
+      extendedStyle |= WS_EX_COMPOSITED;
+    }
 
     if (aInitData->mIsDragPopup) {
       // This flag makes the window transparent to mouse events