if (aFrameList) { mFrames.AppendFrames(this, aFrameList); return ChildListChanged(nsIDOMMutationEvent::ADDITION); } return NS_OK; }
  AppendFrames(nsPresContext* aPresContext,               nsIPresShell&   aPresShell,               nsIAtom*        aListName,               nsIFrame*       aFrameList)  {    nsresult rv = nsBlockFrame::AppendFrames(aPresContext, aPresShell, aListName, aFrameList);    nsMathMLContainerFrame::ReLayoutChildren(aPresContext, this);    return rv;  }