Bug 172019 [Viewers] Plus sign doesn't disappear when using deferred content providers
3.3 M4 Use a tree viewer with a content provider using IDeferredWorkbenchAdapter and DeferredTreeContentManager. When fetchDeferredChildren is call and no elements are reported to the element collector the plus sign of the node doesn't disappear. This work without problems under Windows and Mac/OS (e.g. the plus sign disappears).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
} else {
				max = mid - 1;
			}
		}
		return min;
	}
	/**
	 * Return the tree path that should be used as the parent path for the given
	 * widget and sorter. A <code>null</code> is returned if either the sorter
	 * is not a {@link TreePathViewerSorter} or if the parent widget is not an
	 * {@link Item} (i.e. is the root of the tree).
	 * 
	 * @param parent
	 *            the parent widget
	 * @param comparator
	 *            the sorter
	 * @return the tree path that should be used as the parent path for the
	 *         given widget and sorter
	 */
	private TreePath internalGetSorterParentPath(Widget parent,
			ViewerComparator comparator) {
		TreePath path;
		if (comparator instanceof TreePathViewerSorter
				&& parent instanceof Item) {
			Item item = (Item) parent;
			path = getTreePathFromItem(item);
		} else {
			path = null;
		}
		return path;