[vala] gtk+-3.0: Fix ListBoxUpdateHeaderFunc while making "before" nullable

[Rico Tzschichholz <ricotz src gnome org>]

commit 6463ee079a9aad4cd548a41c903e8e272a444370
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Oct 31 22:26:54 2015 +0100

    gtk+-3.0: Fix ListBoxUpdateHeaderFunc while making "before" nullable

 vapi/gtk+-3.0.vapi                       |    2 +-
 vapi/packages/gtk+-3.0/gtk+-3.0.metadata |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/vapi/gtk+-3.0.vapi b/vapi/gtk+-3.0.vapi
index acbf235..0fcab5b 100644
--- a/vapi/gtk+-3.0.vapi
+++ b/vapi/gtk+-3.0.vapi
@@ -8855,7 +8855,7 @@ namespace Gtk {
        [CCode (cheader_filename = "gtk/gtk.h")]
        public delegate int ListBoxSortFunc (Gtk.ListBoxRow row1, Gtk.ListBoxRow row2);
        [CCode (cheader_filename = "gtk/gtk.h")]
-       public delegate void ListBoxUpdateHeaderFunc (Gtk.ListBoxRow row, Gtk.ListBoxRow before);
+       public delegate void ListBoxUpdateHeaderFunc (Gtk.ListBoxRow row, Gtk.ListBoxRow? before);
        [CCode (cheader_filename = "gtk/gtk.h", has_target = false)]
        public delegate void MenuDetachFunc (Gtk.Widget attach_widget, Gtk.Menu menu);
        [CCode (cheader_filename = "gtk/gtk.h")]
diff --git a/vapi/packages/gtk+-3.0/gtk+-3.0.metadata b/vapi/packages/gtk+-3.0/gtk+-3.0.metadata
index 3a92910..36bc291 100644
--- a/vapi/packages/gtk+-3.0/gtk+-3.0.metadata
+++ b/vapi/packages/gtk+-3.0/gtk+-3.0.metadata
@@ -679,6 +679,7 @@ GtkListBox::row_selected.row nullable="1"
 GtkListBox::unselect_all has_emitter="1"
 GtkListBoxCreateWidgetFunc transfer_ownership="1"
 GtkListBoxCreateWidgetFunc.item type_name="GLib.Object"
+GtkListBoxUpdateHeaderFunc.before nullable="1"
 gtk_list_store_new ellipsis="1" sentinel="-1"
 gtk_list_store_newv.n_columns hidden="1"
 gtk_list_store_newv.types array_length_pos="0.9"