nsLineData* lastLine = mLines;   if (nsnull != lastLine) { while (nsnull != lastLine->mNextLine) { lastLine = lastLine->mNextLine;
if (nsnull != aLine) { while (nsnull != aLine->mNext) { aLine = aLine->mNext;
nsLineData* nsBlockFrame::LastLine(){  nsLineData* lastLine = mLines;  // Get the last line  if (nsnull != lastLine) {    while (nsnull != lastLine->mNextLine) {      lastLine = lastLine->mNextLine;    }  }  return lastLine;}