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
nSelected--;				
			}
		}
		return false;
	}
	/**
	* Returns the selected elements.
	*/
	public List getSelectedElements() {
		ArrayList result= new ArrayList();
		if (fTree != null) {
			ISelection selection= fTree.getSelection();
			if (selection instanceof IStructuredSelection) {
				Iterator iter= ((IStructuredSelection)selection).iterator();
				while (iter.hasNext()) {
					result.add(iter.next());
				}
			}
		}
		return result;
	}
	
	public void expandElement(Object element, int level) {
		if (fTree != null) {
			fTree.expandToLevel(element, level);
		}
	}
	
	
	private class TreeViewerAdapter implements ITreeContentProvider, ISelectionChangedListener, IDoubleClickListener {