Bug 64880 Wrong rendering of unbound User library in package explorer [package explorer]
RC1 - create a user library for JUnit - now edit the .classpath file so that the class path entry points to a non existing library (e.g. <classpathentry kind="con" path="org.eclipse.jdt.USER_LIBRARY/JUnit2"/>) - save - the package explorer contain two JRE entries.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/ClassPathContainer.java
/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.packageview;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IAdaptable;