[gnome-boxes] app-window: Add a workaround to a crash

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 56dfff5c95efe48d5f3be717684af11542214806
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Aug 3 16:16:02 2014 +0200

    app-window: Add a workaround to a crash
    
    Use 'this.window' to refer to Topbar's AppWindow in a closure to
    avoid a (likely Vala) bug (734877) while destroying the closure.
    
    This is needed to make multiple windows possible.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=734486

 src/topbar.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/topbar.vala b/src/topbar.vala
index 1875589..9b26013 100644
--- a/src/topbar.vala
+++ b/src/topbar.vala
@@ -101,7 +101,8 @@ private class Boxes.Topbar: Gtk.Stack, Boxes.UI {
         this.window = window;
 
         window.notify["selection-mode"].connect (() => {
-            page = window.selection_mode ?
+            // FIXME: Usage of 'this' is a work around for https://bugzilla.gnome.org/show_bug.cgi?id=734877
+            page = this.window.selection_mode ?
                 TopbarPage.SELECTION : page = TopbarPage.COLLECTION;
         });