static bool shouldfocusclients();

	/* Nothing else to do? */

	/* Put the new client atop the focus stack and select its monitor */
	if (c) {
		wl_list_remove(&c->flink);
		wl_list_insert(&fstack, &c->flink);
		selmon = c->mon;
	}

		/* If an overlay is focused, don't focus or activate the client,
		 * but only update its position in fstack to render its border with focuscolor
		 * and focus it after the overlay is closed.
		 * It's probably pointless to check if old is a layer surface
		 * since it can't be anything else at this point. */
		else if (wlr_surface_is_layer_surface(old)) {
			struct wlr_layer_surface_v1 *wlr_layer_surface =
				wlr_layer_surface_v1_from_wlr_surface(old);
			if (wlr_layer_surface->mapped && (
						wlr_layer_surface->current.layer == ZWLR_LAYER_SHELL_V1_LAYER_TOP ||
						wlr_layer_surface->current.layer == ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY
						))
				return;
		}

	/* Update wlroots' keyboard focus */

	if (shouldfocusclients(c->mon))
		wlr_seat_keyboard_notify_enter(seat, WLR_SURFACE(c),
				kb->keycodes, kb->num_keycodes, &kb->modifiers);

	wlr_seat_keyboard_notify_enter(seat, WLR_SURFACE(c),
			kb->keycodes, kb->num_keycodes, &kb->modifiers);

	/* Put the new client atop the focus stack and select its monitor */
	wl_list_remove(&c->flink);
	wl_list_insert(&fstack, &c->flink);
	selmon = c->mon;

bool
shouldfocusclients(Monitor *m)
{
	LayerSurface *layersurface;
	uint32_t layers_above_shell[] = {
		ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY,
		ZWLR_LAYER_SHELL_V1_LAYER_TOP,
	};
	for (size_t i = 0; i < LENGTH(layers_above_shell); ++i)
		wl_list_for_each(layersurface, &m->layers[layers_above_shell[i]], link)
			if (layersurface->layer_surface->current.keyboard_interactive &&
					layersurface->layer_surface->mapped)
				return false;
	return true;
}