Cleans up how the items in the list view of the filter-manager are refreshed, modifies the Signal class as it didn't connect a signal on a controller (BackupFilterCtrl) with an instance-method on a QListViewItem which seemed to have had to do with the fact that the Signal kept its handlers in a set(). When adding a handler to the set, code execution on that branch just stopped, w/o/ an exception, resulting in the list item not being initialized properly.