fMustLeave= false;
	private void install(boolean canCoexist) {				if (!canCoexist){			LinkedPositionManager manager= (LinkedPositionManager) fgActiveManagers.get(fDocument);			if (manager != null)				manager.leave(true);			}				fgActiveManagers.put(fDocument, this);		fDocument.addPositionCategory(fPositionCategoryName);		fDocument.addPositionUpdater(this);				fDocument.addDocumentListener(this);	}	