mutt_error ("Threading is not enabled.");
mutt_error _("Threading is not enabled.");
int _mutt_aside_thread (HEADER *hdr, short dir, short subthreads){  HEADER *tmp;  if ((Sort & SORT_MASK) != SORT_THREADS)  {    mutt_error ("Threading is not enabled.");    return (hdr->virtual);  }  if (!subthreads)  {    while (hdr->parent)      hdr = hdr->parent;  }  else  {    if ((dir != 0) ^ ((Sort & SORT_REVERSE) != 0))    {      while (!hdr->next && hdr->parent)	hdr = hdr->parent;    }    else    {      while (!hdr->prev && hdr->parent)	hdr = hdr->parent;    }  }  if ((dir != 0) ^ ((Sort & SORT_REVERSE) != 0))  {    do    { 	hdr = hdr->next;	if (!hdr)	  return (-1);	tmp = find_virtual (hdr);    } while (!tmp);  }  else  {    do    { 	hdr = hdr->prev;	if (!hdr)	  return (-1);	tmp = find_virtual (hdr);    } while (!tmp);  }  return (tmp->virtual);}