From c9d920e9c630fd8b99b863e034742fd3b38e12d3 Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Sat, 22 Dec 2018 02:15:50 +0100
Subject: Revise lifetime management of IntersectionObservers.

Tag #249
---
 dom/base/DOMIntersectionObserver.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'dom/base/DOMIntersectionObserver.h')

diff --git a/dom/base/DOMIntersectionObserver.h b/dom/base/DOMIntersectionObserver.h
index 8144fc5c5..c290002ea 100644
--- a/dom/base/DOMIntersectionObserver.h
+++ b/dom/base/DOMIntersectionObserver.h
@@ -106,7 +106,10 @@ class DOMIntersectionObserver final : public nsISupports,
 public:
   DOMIntersectionObserver(already_AddRefed<nsPIDOMWindowInner>&& aOwner,
                           mozilla::dom::IntersectionCallback& aCb)
-  : mOwner(aOwner), mCallback(&aCb), mConnected(false)
+  : mOwner(aOwner)
+  , mDocument(mOwner->GetExtantDoc())
+  , mCallback(&aCb)
+  , mConnected(false)
   {
   }
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
@@ -164,6 +167,7 @@ protected:
                                       double aIntersectionRatio);
 
   nsCOMPtr<nsPIDOMWindowInner>                    mOwner;
+  RefPtr<nsIDocument>                             mDocument;
   RefPtr<mozilla::dom::IntersectionCallback>      mCallback;
   RefPtr<Element>                                 mRoot;
   nsCSSRect                                       mRootMargin;
-- 
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