cleartrace(s)
{
        local h;

        if (argc < 1)
        {
                s = refwindow(w0);
        }

        if (length(s) > 0)
        {
                /* get line handles placed for editing */
                h = findhandle(s, "tag", "editline");

                if (length(h) > 0)
                {
                        deletehandle(h);
                }
        }
}