Bug 32656 Open/Close project in package explorer looses selection on java-projects. [package explorer]
Not on non-java projects, which looks wrong when multiple java- and non-java-projects are opened/closed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
protected TreeViewer fViewer;
	protected Object fInput;
	private boolean fIsFlatLayout;
	private PackageFragmentProvider fPackageFragmentProvider= new PackageFragmentProvider();
	
	private int fPendingChanges;
	/**
	 * Creates a new content provider for Java elements.
	 */
	public PackageExplorerContentProvider() {
	}
	/**
	 * Creates a new content provider for Java elements.
	 */