From 7b21ea3e0fce99636e1eaa48e7b5dd8757facb58 Mon Sep 17 00:00:00 2001
From: "michaelp%netscape.com" <michaelp%netscape.com>
Date: Tue, 18 Aug 1998 22:03:34 +0000
Subject: [PATCH] when killing a window, we now set the GWL_USERDATA to NULL.
 this will basically kill the "parent" pointer.

---
 widget/src/windows/nsWindow.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/widget/src/windows/nsWindow.cpp b/widget/src/windows/nsWindow.cpp
index 53b4a47dd91..18c6ddd0055 100644
--- a/widget/src/windows/nsWindow.cpp
+++ b/widget/src/windows/nsWindow.cpp
@@ -1754,7 +1754,8 @@ void nsWindow::SubclassWindow(BOOL bState)
         ::SetWindowLong(mWnd, GWL_USERDATA, (LONG)this);
     } 
     else {
-        (void) ::SetWindowLong(mWnd, GWL_WNDPROC, (LONG)mPrevWndProc);
+        ::SetWindowLong(mWnd, GWL_WNDPROC, (LONG)mPrevWndProc);
+        ::SetWindowLong(mWnd, GWL_USERDATA, (LONG)NULL);
         mPrevWndProc = NULL;
     }
 }
@@ -1768,7 +1769,7 @@ void nsWindow::SubclassWindow(BOOL bState)
 void nsWindow::OnDestroy()
 {
     SubclassWindow(FALSE);
-    mWnd = 0;
+    mWnd = NULL;
 
     // free GDI objects
     if (mBrush) {