From 2e2f297290a0930094f38998b17dd9e1d2e33b24 Mon Sep 17 00:00:00 2001
From: "erik%netscape.com" <erik%netscape.com>
Date: Sun, 13 Feb 2000 18:05:36 +0000
Subject: [PATCH] bug 27543 and bug 27566; crashing in profile manager; need to
 unregister pref callback when destroying device context; r=none

---
 gfx/src/windows/nsDeviceContextWin.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gfx/src/windows/nsDeviceContextWin.cpp b/gfx/src/windows/nsDeviceContextWin.cpp
index d7529595c98..7070eb595a1 100644
--- a/gfx/src/windows/nsDeviceContextWin.cpp
+++ b/gfx/src/windows/nsDeviceContextWin.cpp
@@ -82,6 +82,12 @@ nsDeviceContextWin :: ~nsDeviceContextWin()
   }
 
   NS_IF_RELEASE(mSpec);
+
+  nsresult res = NS_ERROR_FAILURE;
+  NS_WITH_SERVICE(nsIPref, prefs, kPrefCID, &res);
+  if (NS_SUCCEEDED(res)) {
+    prefs->UnregisterCallback(nav4rounding, PrefChanged, this);
+  }
 }
 
 NS_IMETHODIMP nsDeviceContextWin :: Init(nsNativeWidget aWidget)