Bug 130976 [Viewers] Error is calculation of parent path when calling TreePathViewerSorter
There is an error in the parent path calculation in AbstractTreeViewer#getSortedChildren. If the input of the viewer is passed, a tee path of length one is passed to the sorter but a null should be passed (as mentioned in the method spec). I will attach a patch.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
sorter.sort(this,filtered);
				}
			}
            createAddedElements(widget, filtered);
        }
	}
	/**
	 * Filter the children elements.
	 * @param parentElementOrTreePath the parent element or path
	 * @param elements the child elements
	 * @return the filter list of children
	 */
	private Object[] filter(Object parentElementOrTreePath, Object[] elements) {
		ViewerFilter[] filters = getFilters();
		if (filters != null) {
			ArrayList filtered = new ArrayList(elements.length);
			for (int i = 0; i < elements.length; i++) {
				boolean add = true;
				for (int j = 0; j < filters.length; j++) {
					add = filters[j].select(this, parentElementOrTreePath, elements[i]);
					if (!add) {
						break;
					}
				}
				if (add) {
					filtered.add(elements[i]);
				}
			}
			return filtered.toArray();
		}