if(!expanded) return;
	public final void invalidateLineRange(int firstLine, int lastLine)	{		if(!expanded)			return;		FontMetrics pfm = textArea.getPainter().getFontMetrics();		repaint(0,textArea.lineToY(firstLine) + pfm.getDescent() + pfm.getLeading(),			getWidth(),(lastLine - firstLine + 1) * pfm.getHeight());	}