Reimplemented to refresh the namespacebrowser after kernel
        restarts

def _handle_status(self, msg):
        """
        Reimplemented to refresh the namespacebrowser after kernel
        restarts
        """
        state = msg['content'].get('execution_state', '')
        msg_type = msg['parent_header'].get('msg_type', '')
        if state == 'starting':
            # This is needed to show the time a kernel
            # has been alive in each console.
            self.ipyclient.t0 = time.monotonic()
            self.ipyclient.timer.timeout.connect(self.ipyclient.show_time)
            self.ipyclient.timer.start(1000)

            # This handles restarts when the kernel dies
            # unexpectedly
            if not self._kernel_is_starting:
                self._kernel_is_starting = True
        elif state == 'idle' and msg_type == 'shutdown_request':
            # This handles restarts asked by the user
            if self.namespacebrowser is not None:
                self.set_namespace_view_settings()
                self.refresh_namespacebrowser()
            self.ipyclient.t0 = time.monotonic()
        else:
            super(NamepaceBrowserWidget, self)._handle_status(msg)