fix crash on floating windows

sway/input/seat.c

@@ -671,8 +671,10 @@ void seat_set_focus_warp(struct sway_seat *seat,
 	// This must happen for both the pending and current children lists.
 	if (container_is_floating(container)) {
 		list_move_to_end(container->parent->children, container);
+		if (container_has_ancestor(container, container->current.parent)) {
 			list_move_to_end(container->parent->current.children, container);
 		}
+	}
 
 	// clean up unfocused empty workspace on new output
 	if (new_output_last_ws) {