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
fFileNameField.setLabelText(NewWizardMessages.getString("SourceAttachmentBlock.filename.varlabel")); 
			fFileNameField.setButtonLabel(NewWizardMessages.getString("SourceAttachmentBlock.filename.external.varbutton")); 
			((VariablePathDialogField)fFileNameField).setVariableButtonLabel(NewWizardMessages.getString("SourceAttachmentBlock.filename.variable.button")); 
		
			fPrefixField= new VariablePathDialogField(adapter);
			fPrefixField.setDialogFieldListener(adapter);
			fPrefixField.setLabelText(NewWizardMessages.getString("SourceAttachmentBlock.prefix.varlabel")); 
			fPrefixField.setButtonLabel(NewWizardMessages.getString("SourceAttachmentBlock.prefix.varbutton"));			 
			((VariablePathDialogField)fPrefixField).setVariableButtonLabel(NewWizardMessages.getString("SourceAttachmentBlock.prefix.variable.button")); 
			
		} else {
			fFileNameField= new StringButtonDialogField(adapter);
			fFileNameField.setDialogFieldListener(adapter);
			fFileNameField.setLabelText(NewWizardMessages.getString("SourceAttachmentBlock.filename.label")); 
			fFileNameField.setButtonLabel(NewWizardMessages.getString("SourceAttachmentBlock.filename.external.button")); 
		
			fInternalButtonField= new SelectionButtonDialogField(SWT.PUSH);
			fInternalButtonField.setDialogFieldListener(adapter);
			fInternalButtonField.setLabelText(NewWizardMessages.getString("SourceAttachmentBlock.filename.internal.button")); 
			
			fPrefixField= new StringButtonDialogField(adapter);
			fPrefixField.setDialogFieldListener(adapter);
			fPrefixField.setLabelText(NewWizardMessages.getString("SourceAttachmentBlock.prefix.label")); 
			fPrefixField.setButtonLabel(NewWizardMessages.getString("SourceAttachmentBlock.prefix.button")); 
		}	
		
		
		fJavaDocField= new StringButtonDialogField(adapter);
		fJavaDocField.setDialogFieldListener(adapter);
		fJavaDocField.setLabelText(NewWizardMessages.getString("SourceAttachmentBlock.javadoc.label"));