[gnome-boxes/gnome-3-12] wizard: Do a more thorough cleanup

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 0a7a9dc86a7f31da7b0871495e5bdc382174ef49
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Mar 25 15:17:33 2014 +0000

    wizard: Do a more thorough cleanup
    
    Clean-up all state in cleanup() method.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=726967

 src/wizard-source.vala |    7 +++++++
 src/wizard.vala        |    3 +++
 2 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index 9eae31a..a228d97 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -169,6 +169,13 @@ private class Boxes.WizardSource: Gtk.Stack {
         transition_type = Gtk.StackTransitionType.SLIDE_LEFT_RIGHT; // FIXME: Why this won't work from .ui 
file?
     }
 
+    public void cleanup () {
+        install_media = null;
+        libvirt_sys_import = false;
+        selected = null;
+        uri = "";
+    }
+
     [GtkCallback]
     private void on_enter_url_button_clicked () {
         page = SourcePage.URL;
diff --git a/src/wizard.vala b/src/wizard.vala
index 0af06cd..fe48f0a 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -191,6 +191,9 @@ private class Boxes.Wizard: Gtk.Stack, Boxes.UI {
 
     public void cleanup () {
         destroy_machine ();
+        vm_creator = null;
+        source = null;
+        wizard_source.cleanup ();
     }
 
     private async bool create () {