Bug 23031 Package explorer does not update when input==package [package explorer]
From a java perspective, create a Java project with two packages (say test.package1 and test.package2). Create a couple of classes in both packages. From the package view, select test.package2 and from the context menu, open a new java window on it. Notice you only see the two classes you created in this package. Now go back to the other window, and move a class from test.package1 to test.package2. Go back to the new window, look at the package view and notice it still only displays 2 classes. Selecting refresh from the context menu does nothing. If you close the package view and open it again, then you see 3 classes.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
private TreeViewer fViewer;
	private Object fInput;
	private boolean fIsFlatLayout;
	private PackageFragmentProvider fPackageFragmentProvider= new PackageFragmentProvider();
	
	private int fPendingChanges;
	private PackageExplorerPart fPart;
	/**
	 * Creates a new content provider for Java elements.
	 */
	public PackageExplorerContentProvider(PackageExplorerPart part, boolean provideMembers, boolean provideWorkingCopy) {
		super(provideMembers, provideWorkingCopy);	
		fPart= part;
	}
	
	/* (non-Javadoc)
	 * Method declared on IElementChangedListener.
	 */
	public void elementChanged(final ElementChangedEvent event) {
		try {
			processDelta(event.getDelta());
		} catch(JavaModelException e) {