'Updates the client stack list
This is needed for third party tasklists and drag and drop of tabs in
chrome'

def update_client_list(self):

    windows = [wid for (wid, c) in self.windowMap.items() if c.group]
    self.root.set_property('_NET_CLIENT_LIST', windows)
    self.root.set_property('_NET_CLIENT_LIST_STACKING', windows)
