Bug 6672 jar no longer exported after attach source
1206 1. Create a project test. 2. Add a jar (say resources.jar) to the classpath and export the entry 3. Attach source (say resourcessrc.zip) to the jar. Notice, the jar is no longer exported - this information is discarded during the attach source process.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceAttachmentBlock.java
private IStatusChangeListener fContext;
	
	private StringButtonDialogField fFileNameField;
	private SelectionButtonDialogField fInternalButtonField;
	
	private StringButtonDialogField fPrefixField;
	private StringButtonDialogField fJavaDocField;
	
	private boolean fIsVariableEntry;
	
	private IStatus fNameStatus;
	private IStatus fPrefixStatus;
	private IStatus fJavaDocStatus;
		
	private IPath fJARPath;
	
	/**
	 * The file to which the archive path points to.
	 * Only set when the file exists.
	 */
	private File fResolvedFile; 
	/**
	 * The path to which the archive variable points.
	 * Null if invalid path or not resolvable. Must not exist.
	 */	
	private IPath fFileVariablePath;
	
	private URL fJavaDocLocation;