int lastLine = firstLine + textArea.getVisibleLines();
int lastLine = firstLine + (getHeight() / lineHeight);
	protected void paintCustomHighlights(Graphics gfx)	{		int lineHeight = textArea.getPainter().getFontMetrics()			.getHeight();		int firstLine = textArea.getFirstLine();		int lastLine = firstLine + textArea.getVisibleLines();		int y = 0;		for (int line = firstLine; line < lastLine;			line++, y += lineHeight)		{			highlights.paintHighlight(gfx, line, y);		}	}