mFrameState = aPresShell->GetDocument()->GetLayoutHistoryState();
nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell,                                                 nsIFrame*     aFixedContainingBlock,                                                 nsIFrame*     aAbsoluteContainingBlock,                                                 nsIFrame*     aFloatContainingBlock)  : mPresContext(aPresShell->GetPresContext()),    mPresShell(aPresShell),    mFrameManager(aPresShell->FrameManager()),    mFixedItems(aFixedContainingBlock),    mAbsoluteItems(aAbsoluteContainingBlock),    mFloatedItems(aFloatContainingBlock),    mFirstLetterStyle(PR_FALSE),    mFirstLineStyle(PR_FALSE),    mPseudoFrames(),    mAnonymousCreator(nsnull),    mInsertionContent(nsnull),    mCreatorIsBlock(PR_FALSE){  mFrameState = aPresShell->GetDocument()->GetLayoutHistoryState();}