Bug 65240 Hierarchical layout: Problems with inclusion filters [package explorer]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
Object parent= getParent(child);
		if (parent == null)
			return false;
		if (parent.equals(root))
			return true;
		return isParent(root, parent);
	}
	 void postRefresh(final List toRefresh, final boolean updateLabels) {
		postRunnable(new Runnable() {
			public void run() {
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()) {
					for (Iterator iter= toRefresh.iterator(); iter.hasNext();) {
						fViewer.refresh(iter.next(), updateLabels);
					}
				}
			}
		});
	}
	private void postAdd(final Object parent, final Object element) {
		postRunnable(new Runnable() {
			public void run() {
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()){
					
					if (fViewer.testFindItem(element) == null) 
						fViewer.add(parent, element);
				}
			}
		});