Bug 158778 [Viewers] request for remove(parent, index) API on tree viewer
3.3 It would be helpful to have a 'remove(Object parent, int index)' method on the tree viewer to complement that 'replace(...)' and 'setChildCount(...)' APIs. The debug platform requires such a method to implement filtering in virtual tree views. Rather than performing a 'replace/remove' based on elements, the content provider can make one atomic call to remove an element at a specific index.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
items[i].dispose();
		}
		
		
		
		
		
		
		
		for (int i = 0; i < min; ++i) {
			Item item = items[i];
			Object oldElement = item.getData();
			if (oldElement != null) {
				Object newElement = elementChildren[i];
				if (newElement != oldElement) {
					if (equals(newElement, oldElement)) {
						
						
						
						
						Object data = item.getData();
						if (data != null) {
							unmapElement(data, item);
						}
						item.setData(newElement);
						mapElement(newElement, item);
					} else {
						disassociate(item);
						
						item.setImage(null);