Bug 54737 Libraries dialog doesn't remember status of items in library tree
Preferences > Java > Build Path > User Libraries: The dialog does not seem to correctly remember the status of the items in the "Defined user libraries" tree. When I leave the dialog I close (un-cascade) all items. When I open the dialog again, most of the items are open (cascaded) again. This is disturbing because I cannot overview the items. It's like opening the Windows explorer with not only the drives shown but all folders being open.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/dialogfields/TreeListDialogField.java
protected TreeViewer fTree;
	protected ILabelProvider fLabelProvider;
	protected TreeViewerAdapter fTreeViewerAdapter;
	protected List fElements;
	protected ViewerSorter fViewerSorter;
	protected String[] fButtonLabels;
	private Button[] fButtonControls;
	private boolean[] fButtonsEnabled;
	private int fRemoveButtonIndex;
	private int fUpButtonIndex;
	private int fDownButtonIndex;
	private Label fLastSeparator;
	private Tree fTreeControl;
	private Composite fButtonsControl;
	private ISelection fSelectionWhenEnabled;
	private ITreeListAdapter fTreeAdapter;
	private Object fParentElement;