From 091d06b43b294390a96106e57a7462f6303107a3 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Fri, 17 Apr 2020 05:26:58 -0400
Subject: Bug 1363481 - Add the old attribute value as a parameter to
 Element::AfterSetAttr

Tag #1375
---
 dom/base/nsMappedAttributes.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'dom/base/nsMappedAttributes.cpp')

diff --git a/dom/base/nsMappedAttributes.cpp b/dom/base/nsMappedAttributes.cpp
index 9e80c94df..05ad42310 100644
--- a/dom/base/nsMappedAttributes.cpp
+++ b/dom/base/nsMappedAttributes.cpp
@@ -85,15 +85,16 @@ NS_IMPL_ISUPPORTS(nsMappedAttributes,
                   nsIStyleRule)
 
 void
-nsMappedAttributes::SetAndTakeAttr(nsIAtom* aAttrName, nsAttrValue& aValue)
+nsMappedAttributes::SetAndSwapAttr(nsIAtom* aAttrName, nsAttrValue& aValue,
+                                   bool* aValueWasSet)
 {
   NS_PRECONDITION(aAttrName, "null name");
-
+  *aValueWasSet = false;
   uint32_t i;
   for (i = 0; i < mAttrCount && !Attrs()[i].mName.IsSmaller(aAttrName); ++i) {
     if (Attrs()[i].mName.Equals(aAttrName)) {
-      Attrs()[i].mValue.Reset();
       Attrs()[i].mValue.SwapValueWith(aValue);
+      *aValueWasSet = true;
       return;
     }
   }
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