Method code for $root.descendants_to()

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---

  1: arg checked, levels, maxlev;
  2: var c, list;
  3: 
  4: list = [this()];
  5: levels++;
  6: 
  7: // check parents
  8: if (!maxlev || maxlev != levels) {
  9:     for c in (.children()) {
 10:         list += [c.descendants_to(checked, levels, maxlev)];
 11:         checked = checked.setadd(c);
 12:     }
 13: }
 14: return list;

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