From 34e2c4054fc597ab9ef3355470a7b1c2c20bbc84 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Fri, 17 Apr 2020 05:25:20 -0400
Subject: Bug 1360157 - Assert that a display: contents child always has a
 parent

Tag #1375
---
 layout/base/nsCSSFrameConstructor.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'layout/base/nsCSSFrameConstructor.cpp')

diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 866fa148b..bee9ed629 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -8296,6 +8296,7 @@ nsCSSFrameConstructor::ContentRemoved(nsIContent*  aContainer,
              "display:contents nodes shouldn't have a frame");
   if (!childFrame && GetDisplayContentsStyleFor(aChild)) {
     nsIContent* ancestor = aContainer;
+    MOZ_ASSERT(ancestor, "display: contents on the root?");
     while (!ancestor->GetPrimaryFrame()) {
       // FIXME(emilio): Should this use the flattened tree parent instead?
       ancestor = ancestor->GetParent();
-- 
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