[gnome-chess] Ensure preferences dialog is transient for main window

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b5788f2f5bb9baad13f06139a8bc7cc4375a2c72
Author: Michael I Doherty <michael i doherty intel com>
Date:   Mon Aug 12 11:00:00 2013 +0100

    Ensure preferences dialog is transient for main window
    
    Presenting preferences dialog in full-screen mode makes the main window
    disappear from view, as it is not transient for the main window
    
    https://bugzilla.gnome.org/show_bug.cgi?id=705823

 src/gnome-chess.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 7ac84b9..8d0c64e 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -1387,6 +1387,7 @@ public class Application : Gtk.Application
             warning ("Could not load preferences UI: %s", e.message);
         }
         preferences_dialog = (Gtk.Dialog) preferences_builder.get_object ("preferences");
+        preferences_dialog.transient_for = window;
         
         settings.bind ("show-numbering", preferences_builder.get_object ("show_numbering_check"),
                        "active", SettingsBindFlags.DEFAULT);