tor-browser

commit ec13ac623904dbf5da4006a3b1e827e07f9c3cb4
parent 99f1583c52aa8b8001b837d8c34cab1b5c8473cd
Author: Timothy Nikkel <tnikkel@gmail.com>
Date:   Tue, 11 Nov 2025 04:29:42 +0000

Bug 1998812. Make the same fix to OneStepInAsyncScrollableAncestorChain that bug 1995752 did for GetAsyncScrollableAncestorFrame. r=hiro

Differential Revision: https://phabricator.services.mozilla.com/D271695

Diffstat:
M
layout/base/DisplayPortUtils.cpp
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/layout/base/DisplayPortUtils.cpp b/layout/base/DisplayPortUtils.cpp
@@ -836,7 +836,9 @@ nsIFrame* DisplayPortUtils::OneStepInAsyncScrollableAncestorChain(
     nsIFrame* aFrame) {
   if (aFrame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
       nsLayoutUtils::IsReallyFixedPos(aFrame)) {
-    return aFrame->PresShell()->GetRootScrollContainerFrame();
+    if (nsIFrame* root = aFrame->PresShell()->GetRootScrollContainerFrame()) {
+      return root;
+    }
   }
   return nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
 }