Bug 123424 browsing perspective does not show some packages in hierarchical mode
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/browsing/PackagesViewHierarchicalContentProvider.java
if (parent instanceof IPackageFragmentRoot){
				IPackageFragmentRoot root= (IPackageFragmentRoot) parent;
				if (fInputIsProject){
					postRefresh(root.getJavaProject());
				} else {
					postRefresh(root);
				}
			} else {
				
				postAdd(lp, parent);
				postRemove(iPackageFragment);
			}
		}
		
		else {
			fMapToPackageFragments.put(key, frag);
			
			if (parent instanceof IPackageFragmentRoot) {
				IPackageFragmentRoot root= (IPackageFragmentRoot) parent;
				if (fInputIsProject) {
					postAdd(frag, root.getJavaProject());
				} else
					postAdd(frag, root);
			} else {
				postAdd(frag, parent);
			}
		}
	}
	private void removeElement(IPackageFragment frag) {