[vala] libwnck-1.0: Fix WnckScreen::active_*_changed signals

[Jürg Billeter <juergbi src gnome org>]

commit 86437bee47de9bc42fa0255ded14f950063435f2
Author: Evan Nemerson <evan polussystems com>
Date:   Wed Jul 8 14:21:20 2009 -0700

    libwnck-1.0: Fix WnckScreen::active_*_changed signals
    
    Fixes part of bug 555566.

 vapi/libwnck-1.0.vapi                          |    4 ++--
 vapi/packages/libwnck-1.0/libwnck-1.0.metadata |    2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/vapi/libwnck-1.0.vapi b/vapi/libwnck-1.0.vapi
index 1d3ed75..8664fc3 100644
--- a/vapi/libwnck-1.0.vapi
+++ b/vapi/libwnck-1.0.vapi
@@ -144,8 +144,8 @@ namespace Wnck {
 		public void release_workspace_layout (int current_token);
 		public void toggle_showing_desktop (bool show);
 		public int try_set_workspace_layout (int current_token, int rows, int columns);
-		public virtual signal void active_window_changed (Wnck.Window previous_window);
-		public virtual signal void active_workspace_changed (Wnck.Workspace previous_workspace);
+		public virtual signal void active_window_changed (Wnck.Window? previous_window);
+		public virtual signal void active_workspace_changed (Wnck.Workspace? previous_workspace);
 		public virtual signal void application_closed (Wnck.Application app);
 		public virtual signal void application_opened (Wnck.Application app);
 		public virtual signal void background_changed ();
diff --git a/vapi/packages/libwnck-1.0/libwnck-1.0.metadata b/vapi/packages/libwnck-1.0/libwnck-1.0.metadata
index df73971..06045dd 100644
--- a/vapi/packages/libwnck-1.0/libwnck-1.0.metadata
+++ b/vapi/packages/libwnck-1.0/libwnck-1.0.metadata
@@ -1,2 +1,4 @@
 Wnck cheader_filename="libwnck/libwnck.h"
 
+WnckScreen::active_window_changed.previous_window nullable="1"
+WnckScreen::active_workspace_changed.previous_workspace nullable="1"
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