Bug 171649 [Viewers] AbstractTreeViewerisExpandable(elementOrTreePath) is not called when using a ITreePathContentProvider
Build ID: 3.3M3 More information: see AbstractTreeViewer.java, line 1974, the content provider hasChildren() should not be called directly
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
if (item instanceof Item) {
			if (expanded) {
				createChildren(item);
			}
			setExpanded((Item) item, expanded);
		}
	}
	/**
	 * Sets the selection to the given list of items.
	 * 
	 * @param items
	 *            list of items (element type:
	 *            <code>org.eclipse.swt.widgets.Item</code>)
	 */
	protected abstract void setSelection(List items);
	/**
	 * This implementation of setSelectionToWidget accepts a list of elements or
	 * a list of tree paths.
	 */
	protected void setSelectionToWidget(List v, boolean reveal) {
		if (v == null) {
			setSelection(new ArrayList(0));
			return;
		}
		int size = v.size();
		List newSelection = new ArrayList(size);
		for (int i = 0; i < size; ++i) {
			Object elementOrTreePath = v.get(i);