Bug 31683 Show In doesn't work for class file in rt.jar
I20030611 - create Test project that uses Jar container - open NumberFormat.class - activate Show In... and choose Package Explorer Observe: NumberFormat.class doesn't get revealed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
for (int i= 0; i < deltas.length; i++) {
			if (processResourceDelta(deltas[i], parent))
				return true;
		}
		return false;
	}
	
	private void postRefresh(final Object root) {
		postRefresh(root, true);
	}
	
	private void postRefresh(final Object root, final boolean updateLabels) {
		postRunnable(new Runnable() {
			public void run() {
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()){
					fViewer.refresh(root, 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()){
					fViewer.add(parent, element);
				}
			}
		});