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