def add_conversation_tab(self, conv_id, switch=False):
        """Add conversation tab if not present, and optionally switch to it."""
        conv_widget = self.get_conv_widget(conv_id)
        self._tabbed_window.set_tab(conv_widget, switch=switch,
                                    title=conv_widget.title)
Add conversation tab if not present, and optionally switch to it.
hangups/ui/__main__.py