Bug 191005 PDF preview hangs up with attached xtab.[1102]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFLineAreaLM.java
implements
			ILineStackingLayoutManager
{
	/**
	 * the base-level of the line created by this layout mangaer. each LineArea
	 * has a fixed base-level.
	 */
	
	/**
	 * line counter
	 */
	protected int lineCount = 0;
	/**
	 * current position in current line
	 */
	protected int currentPosition = 0;
	protected boolean breakAfterRelayout = false;
	protected boolean lineFinished = true;
	protected HashMap positionMap = new HashMap( );
	protected ContainerArea last = null;
	
	protected int expectedIP = 0;