From 5898cbcbdf0d45ed260198f2bc35ded0f2d55dbf Mon Sep 17 00:00:00 2001
From: shindli <shindli@mozilla.com>
Date: Mon, 16 Apr 2018 20:15:19 +0300
Subject: [PATCH] Backed out changeset b584ff6f5afa (bug 1453668) for R
 failures in
 file:///C:/Users/task_1523893739/build/tests/reftest/tests/layout/reftests/display-list/retained-dl-style-change-stacking-context-1.html
 on a CLOSED TREE

---
 layout/painting/RetainedDisplayListBuilder.cpp                 | 3 +--
 .../retained-dl-style-change-stacking-context-1.html           | 3 +++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/layout/painting/RetainedDisplayListBuilder.cpp b/layout/painting/RetainedDisplayListBuilder.cpp
index 40ccdb7d2c82..7d10c180a303 100644
--- a/layout/painting/RetainedDisplayListBuilder.cpp
+++ b/layout/painting/RetainedDisplayListBuilder.cpp
@@ -752,8 +752,7 @@ ProcessFrame(nsIFrame* aFrame, nsDisplayListBuilder& aBuilder,
     }
 
     if (currentFrame != aBuilder.RootReferenceFrame() &&
-        currentFrame->IsStackingContext() &&
-        currentFrame->IsFixedPosContainingBlock()) {
+        currentFrame->IsStackingContext()) {
       CRR_LOG("Frame belongs to stacking context frame %p\n", currentFrame);
       // If we found an intermediate stacking context with an existing display item
       // then we can store the dirty rect there and stop. If we couldn't find one then
diff --git a/layout/reftests/display-list/retained-dl-style-change-stacking-context-1.html b/layout/reftests/display-list/retained-dl-style-change-stacking-context-1.html
index e05e6c2a582c..f02e52e80051 100644
--- a/layout/reftests/display-list/retained-dl-style-change-stacking-context-1.html
+++ b/layout/reftests/display-list/retained-dl-style-change-stacking-context-1.html
@@ -17,6 +17,9 @@
   <div style="transform:translateZ(1px)">
     <div id="second" style="background-color:red"></div>
   </div>
+  <div style="position:fixed; left:100px">
+    <div id="third" style="background-color:red"></div>
+  </div>
 </body>
 <script>
 function doTest() {