Bug 156658 Error occour when previewing a text with a style set word-spacing 20cm in PDF
Description: Error occour when previewing a text with a style set word-spacing 20cm Steps to reproduce: 1.new a text and input some text like "actuate great" 2.new a style and set word-spacing 20cm then apply it to the text 3.Preview in PDF Expected: No error occour Actual: Error occour Error log: org.eclipse.birt.report.service.api.ReportServiceException: Error happened while running the report
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTextLM.java
* vestigeIndex saves the position of the vestige relative to 
		 * the text in chunk. 
		 */
		private int vestigeIndex = -1;
		private int vestigeLength = 0;
		
		private int currentPos = 0;
		private int areaStartPos = 0;
		
		private int letterSpacing = 0;
		private int wordSpacing = 0;
		
		private int maxLineSpace = 0;
		private IWordRecognizer wr = null;
		
		/** 
		 * The flag to indicate whether the current TextArea needs to be added
		 * into the line by force. 
		 */ 
		private boolean addByForce = false;
		
		/**
		 * The flag to indicate whether we need to split off the first character next time. 
		 */
		private boolean nothingSplitted = false;
		
		private int leftMargin;
		private int leftBorder;
		private int leftPadding;
		private int rightMargin;