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/LibrariesWorkbookPage.java
private void libaryPageCustomButtonPressed(DialogField field, int index) {
		CPListElement[] libentries= null;
		switch (index) {
		case IDX_ADDJAR: 
			libentries= openJarFileDialog(null);
			break;
		case IDX_ADDEXT: 
			libentries= openExtJarFileDialog(null);
			break;
		case IDX_ADDVAR: 
			libentries= openVariableSelectionDialog(null);
			break;
		case IDX_ADDLIB: 
			libentries= openContainerSelectionDialog(null);
			break;
		case IDX_ADDFOL: 
			libentries= openClassFolderDialog(null);
			break;			
		case IDX_EDIT: 
			editEntry();
			return;
		}
		if (libentries != null) {
			int nElementsChosen= libentries.length;					
			
			List cplist= fLibrariesList.getElements();
			List elementsToAdd= new ArrayList(nElementsChosen);
			
			for (int i= 0; i < nElementsChosen; i++) {