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
ViewerComparator comparator = getComparator();
		if (parentElementOrTreePath != null
				&& comparator instanceof TreePathViewerSorter) {
			TreePathViewerSorter tpvs = (TreePathViewerSorter) comparator;
			
			result = (Object[]) result.clone();
			TreePath path = null;
			if (parentElementOrTreePath instanceof TreePath) {
				path = (TreePath) parentElementOrTreePath;
			} else {
				Object parent = parentElementOrTreePath;
				Widget w = internalGetWidgetToSelect(parent);
				if (w != null) {
					path = internalGetSorterParentPath(w, comparator);
				}
			}
			tpvs.sort(this, path, result);
		} else if (comparator != null) {
			
			result = (Object[]) result.clone();
			comparator.sort(this, result);
		}
		return result;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.StructuredViewer#getFilteredChildren(java.lang.Object)
	 */
	protected Object[] getFilteredChildren(Object parentElementOrTreePath) {