[gnome-boxes] app-window: Explicitly unbind from Machine.status

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit ebb7f5d3db1d6596331a420d35c58ee0bba507c8
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Fri Jan 30 16:31:08 2015 +0000

    app-window: Explicitly unbind from Machine.status
    
    Although removing our only reference to the binding should take care of
    destroying the binding, it doesn't seem to currently be happening. This
    somehow leads to memory corruptions 'open_three_new_windows' test
    scenario.
    
    Lets explicitly unbind, at least until we figure out and get the actual
    issue fixed. Likely a Vala bug.

 src/app-window.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/app-window.vala b/src/app-window.vala
index ccfa4c7..dd10ebf 100644
--- a/src/app-window.vala
+++ b/src/app-window.vala
@@ -183,7 +183,10 @@ private class Boxes.AppWindow: Gtk.ApplicationWindow, Boxes.UI {
             fullscreened = false;
             view.visible = true;
 
-            status_bind = null;
+            if (status_bind != null) {
+                status_bind.unbind ();  // FIXME: We shouldn't neeed to explicitly unbind (Vala bug?)
+                status_bind = null;
+            }
             topbar.status = _("Boxes");
             if (current_item is Machine) {
                 var machine = current_item as Machine;