Bug 98242 [Viewers] [Javadoc] clarify that StructuredViewer does not update sort order if null properties are given
Despite the specification of StructuredViewer.update(Object element, String[] properties) that specifiying null properties forces full update including sort order, the implementation in 3.1M6 calls internalUpdate() which inits needsRefilter to false if no properties are given. Thus a change to a relevant sort attribute of the element does not maintain sort order (e.g. on TreeViewer). Suggested fix: protected void internalUpdate(Widget widget, Object element, String[] properties) { boolean needsRefilter = true; if (properties != null) { needsRefilter = false; for (int i = 0; i < properties.length; ++i) { needsRefilter = needsRefilter(element,properties[i]);
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
*            the element
	 * @param item the item to unmap
	 * @since 2.0
	 */
	protected void unmapElement(Object element, Widget item) {
		
		
		if (elementMap != null) {
			Object widgetOrWidgets = elementMap.get(element);
			if (widgetOrWidgets == null) {
				
				return;
			} else if (widgetOrWidgets instanceof Widget) {
				if (item == widgetOrWidgets) {
					elementMap.remove(element);
				}
			} else {
				Widget[] widgets = (Widget[]) widgetOrWidgets;
				int indexOfItem = Arrays.asList(widgets).indexOf(item);
				if (indexOfItem == -1) {
					return;
				}
				int length = widgets.length;
				if (indexOfItem == 0) {
					if(length == 1) {
						elementMap.remove(element);
					} else {
						Widget[] updatedWidgets = new Widget[length - 1];
						System.arraycopy(widgets, 1, updatedWidgets, 0, length -1 );
						elementMap.put(element, updatedWidgets);