[gnome-boxes] Make UI.previous_ui_state public readable

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 6ff0bd8b85cca881e3e1d9c907a8e744e8a036a0
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Mon Mar 25 17:48:08 2013 +0200

    Make UI.previous_ui_state public readable
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696399

 src/ui.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ui.vala b/src/ui.vala
index 2c56f5b..7aca918 100644
--- a/src/ui.vala
+++ b/src/ui.vala
@@ -13,7 +13,7 @@ private enum Boxes.UIState {
 private abstract class Boxes.UI: GLib.Object {
     public abstract Clutter.Actor actor { get; }
 
-    protected UIState previous_ui_state;
+    public UIState previous_ui_state { get; protected set; }
     private UIState _ui_state;
     [CCode (notify = false)]
     public UIState ui_state {