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
} else {
				if (floating != null) {
					res.add(floating);
				}
				floating= curr;
			}
		}
		if (floating != null) {
			res.add(floating);
		}
		return res;
	}
	private void moveUp(List toMoveUp) {
		if (toMoveUp.size() > 0) {
			setElements(moveUp(fElements, toMoveUp));
			fTree.reveal(toMoveUp.get(0));
		}
	}
	private void moveDown(List toMoveDown) {
		if (toMoveDown.size() > 0) {
			setElements(reverse(moveUp(reverse(fElements), toMoveDown)));
			fTree.reveal(toMoveDown.get(toMoveDown.size() - 1));
		}
	}
	private List reverse(List p) {
		List reverse= new ArrayList(p.size());
		for (int i= p.size() - 1; i >= 0; i--) {
			reverse.add(p.get(i));
		}
		return reverse;