From f82da789c8fad81f2e565512cb024ad287280a88 Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Sat, 22 Dec 2018 14:35:26 +0100
Subject: [PATCH] Fix singed/unsigned type confusion for intersection
 threshold.

Tag #249
---
 dom/base/DOMIntersectionObserver.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dom/base/DOMIntersectionObserver.cpp b/dom/base/DOMIntersectionObserver.cpp
index f5e59c2b9d..650ec83cdb 100644
--- a/dom/base/DOMIntersectionObserver.cpp
+++ b/dom/base/DOMIntersectionObserver.cpp
@@ -424,15 +424,15 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
       intersectionRatio = intersectionRect.isSome() ? 1.0 : 0.0;
     }
 
-    size_t threshold = -1;
+    int32_t threshold = -1;
     if (intersectionRatio > 0.0) {
       if (intersectionRatio >= 1.0) {
         intersectionRatio = 1.0;
-        threshold = mThresholds.Length();
+        threshold = (int32_t)mThresholds.Length();
       } else {
         for (size_t k = 0; k < mThresholds.Length(); ++k) {
           if (mThresholds[k] <= intersectionRatio) {
-            threshold = k + 1;
+            threshold = (int32_t)k + 1;
           } else {
             break;
           }