nsFocusIterator::Last()
nsFrameIterator::Last()
nsFocusIterator::Last(){  nsIFrame* result;  nsIFrame* parent = getCurrent();  while (!IsRootFrame(parent) && (result = GetParentFrame(parent)))    parent = result;  while ((result = GetFirstChild(parent))) {    parent = result;    while ((result = GetNextSibling(parent)))      parent = result;  }  setCurrent(parent);  if (!parent)    setOffEdge(1);  return NS_OK;}