introduce 'groupsearch' for group menu search; matches on either group

number/shortcut and/or name.

search.c

@@ -137,6 +137,16 @@ search_print_cmd(struct menu *mi, int i)
 	    (special) ? "[%s]" : "%s", cmd->name);
 }
 
+void
+search_print_group(struct menu *mi, int i)
+{
+	struct group_ctx	*gc = (struct group_ctx *)mi->ctx;
+
+	(void)snprintf(mi->print, sizeof(mi->print),
+	    (group_holds_only_hidden(gc)) ? "%d: [%s]" : "%d: %s",
+	    gc->num, gc->name);
+}
+
 void
 search_print_client(struct menu *mi, int list)
 {