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
item.setText("");
					}
				}
			}
		}
		for (int i = 0; i < min; ++i) {
			Item item = items[i];
			Object newElement = elementChildren[i];
			if (item.getData() == null) {
				
				associate(newElement, item);
				updatePlus(item, newElement);
				updateItem(item, newElement);
			} else {
				
				updatePlus(item, newElement);
				if (updateLabels) {
					updateItem(item, newElement);
				}
			}
		}
		
		
		
		
		
		
		for (int i = 0; i < min; ++i) {
			Item item = items[i];
			Object newElement = elementChildren[i];