From 144d8ddf923091f70fc95ef3fe1e3d71aa9969e1 Mon Sep 17 00:00:00 2001
From: Timothy Nikkel <tnikkel@gmail.com>
Date: Mon, 6 Apr 2020 18:25:28 +0000
Subject: [PATCH] Bug 1627505. Use WS_EX_LAYERED on the compositor window to
 prevent Direct Manipulation from finding it. r=sotaro

Differential Revision: https://phabricator.services.mozilla.com/D69765

--HG--
extra : moz-landing-system : lando
---
 widget/windows/WinCompositorWindowThread.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/widget/windows/WinCompositorWindowThread.cpp b/widget/windows/WinCompositorWindowThread.cpp
index b1337df3c317..0443e9c6189a 100644
--- a/widget/windows/WinCompositorWindowThread.cpp
+++ b/widget/windows/WinCompositorWindowThread.cpp
@@ -159,7 +159,7 @@ WinCompositorWnds WinCompositorWindowThread::CreateCompositorWindow() {
                              nullptr, 0, GetModuleHandle(nullptr), 0);
 
         compositorWnd = ::CreateWindowEx(
-            WS_EX_NOPARENTNOTIFY | WS_EX_NOREDIRECTIONBITMAP,
+            WS_EX_LAYERED | WS_EX_NOPARENTNOTIFY | WS_EX_NOREDIRECTIONBITMAP,
             kClassNameCompositor, nullptr,
             WS_CHILDWINDOW | WS_DISABLED | WS_VISIBLE, 0, 0, 1, 1,
             initialParentWnd, 0, GetModuleHandle(nullptr), 0);