[gnome-boxes] Only make force shutdown button sensitive if vm is running

[Alexander Larsson <alexl src gnome org>]

commit f7a74d88c85152b88beaf0c925c55a8750eb1790
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Oct 26 11:27:44 2012 +0200

    Only make force shutdown button sensitive if vm is running
    
    https://bugzilla.gnome.org/show_bug.cgi?id=677714

 src/properties.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/properties.vala b/src/properties.vala
index 14a0a6e..6889c57 100644
--- a/src/properties.vala
+++ b/src/properties.vala
@@ -143,8 +143,9 @@ private class Boxes.Properties: Boxes.UI {
             notebook.remove_page (-1);
 
         var machine = App.app.current_item as Machine;
+        var libvirt_machine = App.app.current_item as LibvirtMachine;
 
-        shutdown_button.sensitive = machine != null && machine is LibvirtMachine;
+        shutdown_button.sensitive = libvirt_machine != null && libvirt_machine.is_running ();
 
         if (machine == null)
             return;
@@ -160,7 +161,6 @@ private class Boxes.Properties: Boxes.UI {
 
         PropertiesPage current_page;
 
-        var libvirt_machine = machine as LibvirtMachine;
         if (libvirt_machine != null) {
             stats_id = libvirt_machine.stats_updated.connect (() => {
                 cpu.points = libvirt_machine.cpu_stats;