From 056ffa4abb1480830b9887d1a73b6fdbc87747eb Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Fri, 26 Mar 2021 19:35:54 +0100
Subject: [PATCH] LibWeb: Call requestAnimationFrame() callback with undefined
 this value

We were leaking an empty value via the callback's this value:

    requestAnimationFrame(function () {
        this; // <-- empty value
    });
---
 Userland/Libraries/LibWeb/DOM/Window.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibWeb/DOM/Window.cpp b/Userland/Libraries/LibWeb/DOM/Window.cpp
index 62c327fd75..52607e2ab8 100644
--- a/Userland/Libraries/LibWeb/DOM/Window.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Window.cpp
@@ -140,7 +140,7 @@ i32 Window::request_animation_frame(JS::Function& callback)
         auto& function = const_cast<JS::Function&>(static_cast<const JS::Function&>(*handle.cell()));
         auto& vm = function.vm();
         fake_timestamp += 10;
-        [[maybe_unused]] auto rc = vm.call(function, {}, JS::Value(fake_timestamp));
+        [[maybe_unused]] auto rc = vm.call(function, JS::js_undefined(), JS::Value(fake_timestamp));
         if (vm.exception())
             vm.clear_exception();
         GUI::DisplayLink::unregister_callback(link_id);