// code of WorldEdit expects it
String[] split = new String[args.length + 1];
System.arraycopy(args, 0, split, 1, args.length);
split[0] = cmd.getName();
CommandSuggestionEvent event = new CommandSuggestionEvent(wrapCommandSender(sender), Joiner.on(" ").join(split));
getWorldEdit().getEventBus().post(event);
return event.getSuggestions();
}