[gnome-2048] Fix window size saving.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 949a4294a3ccb28159dd8ce264a70e8ae08ab58f
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Feb 17 15:44:13 2016 +0100

    Fix window size saving.

 src/application.vala |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)
---
diff --git a/src/application.vala b/src/application.vala
index cf33ab7..bf72139 100644
--- a/src/application.vala
+++ b/src/application.vala
@@ -185,7 +185,7 @@ public class Application : Gtk.Application
 
     _window.set_events (_window.get_events () | Gdk.EventMask.STRUCTURE_MASK | Gdk.EventMask.KEY_PRESS_MASK 
| Gdk.EventMask.KEY_RELEASE_MASK);
     _window.key_press_event.connect (key_press_event_cb);
-    _window.configure_event.connect (window_configure_event_cb);
+    _window.size_allocate.connect (window_size_allocate_cb);
     _window.window_state_event.connect (window_state_event_cb);
 
     Gdk.Geometry geom = Gdk.Geometry ();
@@ -394,14 +394,11 @@ public class Application : Gtk.Application
     return _game.key_pressed (event);
   }
 
-  private bool window_configure_event_cb (Gdk.EventConfigure event)
+  private void window_size_allocate_cb ()
   {
-    if (!_window_maximized) {
-      _window_width = event.width;
-      _window_height = event.height;
-    }
-
-    return false;
+    if (_window_maximized)
+      return;
+    _window.get_size (out _window_width, out _window_height);
   }
 
   private bool window_state_event_cb (Gdk.EventWindowState event)