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
lastInsertion, element, parentPath);
				
				
				if (lastInsertion == items.length) {
					index = -1;
				} else {
					while (lastInsertion < items.length
							&& internalCompare(comparator, parentPath, element,
									items[lastInsertion].getData()) == 0) {
						
						
						
						
						if (items[lastInsertion].getData().equals(element)) {
							
							refresh(element);
							newItem = false;
						}
						lastInsertion++;
					}
					
					if (lastInsertion == items.length) {
						index = -1;
					} else {
						index = lastInsertion + i; 
													
					}
				}
			}
			if (newItem) {