Bug 125272 [Viewers] AbstractTreeViewer needs remove(Object parentElement, Object[] childElements)
There is an add(Object parentElement, Object[] childElements) but no corresponding remove(). Without this method, if you have an element that appears under multiple parents, the only way to get model and viewer in sync after removing the element from just one of its parents is calling refresh().
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
return new TreePath(segments.toArray());
	}
	/**
	 * This implementation of getSelection() returns an instance of
	 * ITreeSelection.
	 * 
	 * @since 3.2
	 */
	public ISelection getSelection() {
		Control control = getControl();
		if (control == null || control.isDisposed()) {
			return TreeSelection.EMPTY;
		}
		Widget[] items = getSelection(getControl());
		ArrayList list = new ArrayList(items.length);
		for (int i = 0; i < items.length; i++) {
			Widget item = items[i];
			if (item.getData() != null) {
				list.add(getTreePathFromItem((Item) item));
			}
		}
		return new TreeSelection((TreePath[]) list.toArray(new TreePath[list
				.size()]), getComparer());
	}
	
	protected void setSelectionToWidget(ISelection selection, boolean reveal) {
		if(selection instanceof ITreeSelection) {
			ITreeSelection treeSelection = (ITreeSelection) selection;
			setSelectionToWidget(Arrays.asList(treeSelection.getPaths()), reveal);
		} else {