Move tab (tabs themselves have already been moved by the tabwidget)

def move_tab(self, index_from, index_to):
        """
        Move tab (tabs themselves have already been moved by the tabwidget)
        """
        filename = self.filenames.pop(index_from)
        client = self.clients.pop(index_from)
        self.filenames.insert(index_to, filename)
        self.clients.insert(index_to, client)
        self.update_tabs_text()
        self.sig_update_plugin_title.emit()