Reference: bnc#874594
When the 'Power on virtual machine' button is double clicked,
virt-manager issues two start commands to start the VM which
results in a failure. There is code elsewhere to desensitize the
button but this patch does it earlier.
Index: virt-manager-2.1.0/virtManager/details.py
===================================================================
--- virt-manager-2.1.0.orig/virtManager/details.py
+++ virt-manager-2.1.0/virtManager/details.py
@@ -1505,6 +1505,9 @@ class vmmDetails(vmmGObjectUI):
     def control_vm_run(self, src_ignore):
         if self.has_unapplied_changes(self.get_hw_row()):
             return
+        # De-sensitize widget so a double click on the icon won't attempt to
+        # start the VM twice
+        self.widget("control-run").set_sensitive(False)
         vmmenu.VMActionUI.run(self, self.vm)
 
     def control_vm_shutdown(self, src_ignore):