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
if (prefixPath != null) {
				fPrefixField.setText(prefixPath.toString());
			}
		} else if (field == fJavaDocField) {
			URL jdocURL= chooseJavaDocLocation();
			if (jdocURL != null) {
				fJavaDocField.setText(jdocURL.toExternalForm());
			}
		}			
	}
	
	
	private void attachmentDialogFieldChanged(DialogField field) {
		if (field == fFileNameField) {
			fNameStatus= updateFileNameStatus();
		} else if (field == fInternalButtonField) {
			IPath jarFilePath= chooseInternalJarFile(fFileNameField.getText());
			if (jarFilePath != null) {
				fFileNameField.setText(jarFilePath.toString());
			}
			return;
		} else if (field == fPrefixField) {
			fPrefixStatus= updatePrefixStatus();
		} else if (field == fJavaDocField) {
			fJavaDocStatus= updateJavaDocLocationStatus();
		}
		doStatusLineUpdate();
	}	
		
	private void doStatusLineUpdate() {