Bug 313882 [Regression]pageoverflow plus pagebreakinternal shows different pdf pages in web viewer and preview
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/nLayout/area/impl/ContainerArea.java
* @return
	 */
	public int getAllocatedHeight( )
	{
		if ( hasStyle )
		{
			return height + localProperties.getMarginBottom( )
					+ localProperties.getMarginTop( );
		}
		else
		{
			return height;
		}
	}
	public int getCurrentMaxContentWidth( )
	{
		return maxAvaWidth - currentIP;
	}
	public boolean isEmpty( )
	{
		return children.size( ) == 0;
	}
	public abstract void update( AbstractArea area ) throws BirtException;
	public abstract void add( AbstractArea area );
	protected boolean checkPageBreak( ) throws BirtException
	{
		boolean ret = false;
		if ( !isInInlineStacking && context.isAutoPageBreak( ) )
		{
			int aHeight = getAllocatedHeight( );