Bug 43488 [typing] BadPositionCategoryException in LinkedPositionManager
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/link/contentassist/ContentAssistant2.java
private Thread fThread;
		private boolean fIsReset= false;
		private Object fMutex= new Object();
		private int fShowStyle;
		
		private final static int SHOW_PROPOSALS= 1;
		private final static int SHOW_CONTEXT_INFO= 2;
		
		protected AutoAssistListener() {
		}
		protected void start(int showStyle) {
			fShowStyle= showStyle;
			fThread= new Thread(this, JFaceTextMessages2.getString("ContentAssistant.assist_delay_timer_name")); 
			fThread.start();
		}
		public void run() {
			try {