return aFrame;
return parentFrame;
GetIBContainingBlockFor(nsIFrame* aFrame){  // Get the first "normal" ancestor of the target frame.  NS_PRECONDITION(IsFrameSpecial(aFrame),                  "GetIBContainingBlockFor() should only be called on known IB frames");  nsIFrame* parentFrame;  do {    aFrame->GetParent(&parentFrame);    if (!parentFrame || !IsFrameSpecial(parentFrame))      break;    aFrame = parentFrame;  } while (1);  return aFrame;}