Перекомпилить xfwm4

switch (tile)
{
   case TILE_UP:
      tmp_h = full_h / 2;
      tmp_y = full_y;
      clientMaxSpace (screen_info, &full_x, &tmp_y, &full_w, &tmp_h);
      wc->y = tmp_y + frameTop (c);
      wc->height = tmp_h - frameTop (c) - frameBottom (c);
      break;

switch (tile)
{
   case TILE_UP:
      clientToggleMaximized (c, CLIENT_FLAG_MAXIMIZED_VERT, TRUE);
      break;