From 52f4e2b161b72af04e4870ec55692a3454d57fec Mon Sep 17 00:00:00 2001
From: Dmitry Gorbachev <gorbachev@reactos.org>
Date: Thu, 9 Jul 2009 14:56:59 +0000
Subject: [PATCH] Add an assertion. Bug #4670.

svn path=/trunk/; revision=41831
---
 reactos/subsystems/win32/win32k/ntuser/winpos.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/reactos/subsystems/win32/win32k/ntuser/winpos.c b/reactos/subsystems/win32/win32k/ntuser/winpos.c
index cca1c449b5e..e5b278d73d1 100644
--- a/reactos/subsystems/win32/win32k/ntuser/winpos.c
+++ b/reactos/subsystems/win32/win32k/ntuser/winpos.c
@@ -733,6 +733,8 @@ WinPosInternalMoveWindow(PWINDOW_OBJECT Window, INT MoveX, INT MoveY)
 {
    PWINDOW_OBJECT Child;
 
+   ASSERT(Window != Window->FirstChild);
+
    Window->Wnd->WindowRect.left += MoveX;
    Window->Wnd->WindowRect.right += MoveX;
    Window->Wnd->WindowRect.top += MoveY;