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
if ( !context.allowPageBreak( ) )
		{
			return false;
		}
		
		PDFAbstractLM p = parent;
		while ( p != null )
		{
			if ( !p.allowPageBreak( ) )
			{
				return false;
			}
			p = p.getParent( );
		}
		return true;
	}
	protected boolean needPageBreakBefore(String pageBreak )
	{
		boolean ret = hasMasterPageChanged( );
		if ( IStyle.CSS_ALWAYS_VALUE == pageBreak
				|| IStyle.CSS_LEFT_VALUE == pageBreak
				|| IStyle.CSS_RIGHT_VALUE == pageBreak
				|| IStyle.CSS_SOFT_VALUE == pageBreak)
		{
			return true;
		}
		return ret;
	}
	protected boolean needPageBreakAfter(String pageBreak )
	{