Bug 28510 java build path inconsistency [build path]
20021216 select rt.jar in the package explorer open properties it allows you to set the javadoc location but for source attachment you are sent somewhere else it's inconsistent - on the java build path they both look sort of the same (they sit under the same node in the tree)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceContainerWorkbookPage.java
CPListElement existing= (CPListElement) fFoldersList.getElement(0);
						if (existing.getResource() instanceof IProject) {
							askForChangingBuildPathDialog(existing);
						}
					}
					HashSet modifiedElements= new HashSet();
					askForAddingExclusionPatternsDialog(elementsToAdd, modifiedElements);
					
					fFoldersList.addElements(elementsToAdd);
					fFoldersList.postSetSelection(new StructuredSelection(elementsToAdd));
					
					if (!modifiedElements.isEmpty()) {
						for (Iterator iter= modifiedElements.iterator(); iter.hasNext();) {
							Object elem= iter.next();
							fFoldersList.refresh(elem);
							fFoldersList.expandElement(elem, 3);
						}
					}
				}				
			} else if (index == IDX_EDIT) {
				editEntry();
			}
		}
	}
	private void editEntry() {
		List selElements= fFoldersList.getSelectedElements();
		if (selElements.size() != 1) {
			return;
		}
		Object elem= selElements.get(0);