Bug 212238 [Regression] Pagebreak on chart does not work when preview in PDF/PPT/PostScritp.
Description: Pagebreak on chart does not work when preview in PDF/PPT/PostScritp. build version: 2.3.0 v20071207-0800. steps to reproduce: 1. New a report. 2. Insert a label in layout. 3. Insert a chart in layout. 4. Add pagebreak: Before Always on chart. 5. Preview in PDF/PPT/Postscript. Expected result: The chart should be displayed on the second page. Actual result: The chart is displayed on the first page.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFAbstractLM.java
IStyle style = content.getStyle( );
		String pageBreak = style.getPageBreakAfter( );
		handlePageBreakAfterAvoid(pageBreak);
		if ( canPageBreak( ) )
		{
			return needPageBreakAfter(pageBreak );
		}
		return false;
	}
	protected void handlePageBreakBeforeAvoid(String pageBreak)
	{
		if(parent instanceof PDFBlockStackingLM)
		{
			((PDFBlockStackingLM)parent).setKeepWithNext(IStyle.CSS_AVOID_VALUE == pageBreak);
		}
	}
	
	protected void handlePageBreakAfterAvoid(String pageBreak)
	{
		if(IStyle.CSS_AVOID_VALUE == pageBreak)
		{
			if(parent instanceof PDFBlockStackingLM)
			{
				((PDFBlockStackingLM)parent).setKeepWithNext(true);
			}
		}
		
	}
	protected boolean canPageBreak( )
	{