From ca40be3124a40ac9ce8d259d00dc53813951bc3e Mon Sep 17 00:00:00 2001
From: Benjamin Stover <bstover@mozilla.com>
Date: Wed, 13 Apr 2011 10:45:00 -0700
Subject: [PATCH] Bug 649666 Do not create container layers for scrollboxes
 with (0, 0) scrollRange r=roc

---
 layout/generic/nsGfxScrollFrame.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
index fa4dd392d6b..8d97771df43 100644
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -1983,6 +1983,8 @@ nsGfxScrollFrameInner::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
      (XRE_GetProcessType() == GeckoProcessType_Content &&
      (styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN ||
       styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN) &&
+     (scrollRange.width > 0 ||
+      scrollRange.height > 0) &&
      (!mIsRoot || !mOuter->PresContext()->IsRootContentDocument()));
 
   if (ShouldBuildLayer()) {