details: Teach it about our faux description hotplug

src/virtManager/details.py

@@ -2034,6 +2034,16 @@ class vmmDetails(vmmGObjectUI):
             desc = desc_widget.get_buffer().get_property("text") or ""
             add_define(self.vm.define_description, desc)
 
+            # Hack so that we don't get a warning that
+            # 'changes take effect after reboot'
+            # We already fake hotplug like behavior, by reading the
+            # description from the inactive XML from a running VM
+            #
+            # libvirt since 0.9.10 provides a SetMetadata API that provides
+            # actual <description> 'hotplug', but using that means checking
+            # for support, version, etc, so let's stick with the easy way
+            add_hotplug(lambda d: d, desc)
+
         return self._change_config_helper(df, da, hf, ha)
 
     # CPUs