Bug 28398 New Java Project Wizard: no source folder after using "Back"
Build 20021213 1. Start the new Java Project wizard 2. Enter "JUnix" 3. Press "Next" - see: there's a source folder 4. Press "Back" 5. Change project name to "JUnit" 6. Press "Next" ==> no source folder
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceContainerWorkbookPage.java
buttonLabels= new String[] { 
			 NewWizardMessages.getString("SourceContainerWorkbookPage.folders.add.button"), 
			 null,
			 NewWizardMessages.getString("SourceContainerWorkbookPage.folders.edit.button"), 
			 NewWizardMessages.getString("SourceContainerWorkbookPage.folders.remove.button") 
		};
		removeIndex= IDX_REMOVE;
		
		fFoldersList= new TreeListDialogField(adapter, buttonLabels, new CPListLabelProvider());
		fFoldersList.setDialogFieldListener(adapter);
		fFoldersList.setLabelText(NewWizardMessages.getString("SourceContainerWorkbookPage.folders.label")); 
		fFoldersList.setRemoveButtonIndex(removeIndex);
		
		fFoldersList.setViewerSorter(new CPListElementSorter());
		fFoldersList.enableButton(IDX_EDIT, false);
		
		fUseFolderOutputs= new SelectionButtonDialogField(SWT.CHECK);
		fUseFolderOutputs.setSelection(false);
		fUseFolderOutputs.setLabelText(NewWizardMessages.getString("SourceContainerWorkbookPage.folders.check"));
		fUseFolderOutputs.setDialogFieldListener(adapter);
	}
	
	public void init(IJavaProject jproject) {
		fCurrJProject= jproject;
		fProjPath= fCurrJProject.getProject().getFullPath();	
		updateFoldersList();
	}
	
	private void updateFoldersList() {	
		fFoldersList.removeAllElements();