From 100696b5c1ce14ed29fd622a588ec732c0e6eaa0 Mon Sep 17 00:00:00 2001
From: Alan McGovern <alan@xamarin.com>
Date: Mon, 25 Feb 2013 13:29:07 +0000
Subject: [PATCH] gdk: It is valid to pass a null gdk_event sometimes

For example gtk_drag_start allows a null Gdk.Event so we need to marshal
it to IntPtr.Zero instead of throwing a NullReferenceException

Cherry-picked from the gtk-sharp-2.12 branch.
---
 gdk/gdk-symbols.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdk/gdk-symbols.xml b/gdk/gdk-symbols.xml
index 963247bd0..831f4651d 100644
--- a/gdk/gdk-symbols.xml
+++ b/gdk/gdk-symbols.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <api>
   <symbol type="alias" cname="Window" name="gulong" />
-  <symbol type="marshal" cname="GdkEvent" name="Gdk.Event" marshal_type="IntPtr" call_fmt="{0}.Handle" from_fmt="Gdk.Event.GetEvent ({0})"/>
+  <symbol type="marshal" cname="GdkEvent" name="Gdk.Event" marshal_type="IntPtr" call_fmt="{0} == null ? IntPtr.Zero : {0}.Handle" from_fmt="Gdk.Event.GetEvent ({0})"/>
   <symbol type="marshal" cname="GdkEventAny" name="Gdk.Event" marshal_type="IntPtr" call_fmt="{0}.Handle" from_fmt="Gdk.Event.GetEvent ({0})"/>
   <symbol type="manual" cname="GdkEventButton" name="Gdk.EventButton"/>
   <symbol type="manual" cname="GdkEventClient" name="Gdk.EventClient"/>