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/PDFLeafItemLM.java
{
	public PDFLeafItemLM( PDFLayoutEngineContext context, PDFStackingLM parent,
			IContent content, IReportItemExecutor executor )
	{
		super( context, parent, content,  executor );
	}
	protected void cancelChildren( )
	{
	}
	/**
	 * need overwrite this mothod to change default behavour.
	 * For inline leaf elements, page-break is handled by this layout manager.
	 * For block leaf elements. page-break is handled by it's block container
	 */
	protected boolean handlePageBreakBefore( )
	{
		if ( content != null )
		{
			if ( PropertyUtil.isInlineElement( content ) )
			{
				return super.handlePageBreakBefore( );
			}
		}
		return false;
	}
	/**
	 * need overwrite this mothod to change default behavour.