Bug 8808 Class folder: Must use create to add an existing folder
Build I20020129 "Add Folders..." does not show the project itself. I have to do the following trick to add an existing folder as class folder: Press "Create folder" Enter the name of the existing folder (hopfully it's in the project root :-) Voila BTW: I can't do this a second time - the UI tells me it already exists - which is OK. To be consistent with other dialogs "Create Folder" should always warn about existing projects.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
elementsToAdd.add(curr);
					addAttachmentsFromExistingLibs(curr);
				}
			}
			fLibrariesList.addElements(elementsToAdd);
			fLibrariesList.postSetSelection(new StructuredSelection(libentries));
		}
	}
	
	private void libaryPageSelectionChanged(DialogField field) {
		List selElements= fLibrariesList.getSelectedElements();
		fLibrariesList.enableButton(6, canDoSourceAttachment(selElements));
	}
	
	private void libaryPageDialogFieldChanged(DialogField field) {
		if (fCurrJProject != null) {
			
			updateClasspathList();
		}
	}	
	
	private boolean canDoSourceAttachment(List selElements) {
		if (selElements != null && selElements.size() == 1) {
			CPListElement elem= (CPListElement) selElements.get(0);
			return (!(elem.getResource() instanceof IFolder));
		}
		return false;
	}		
	
	private void updateClasspathList() {