Bug 135709 [WorkingSets] Select Working Sets Select All/Deselect All Enablement
If there are no working sets than both buttons should be disabled.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceWorkingSetPage.java
/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *      IBM Corporation - initial API and implementation 
 *  	Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog font
 * 		should be activated and used by other components.
 *******************************************************************************/
package org.eclipse.ui.internal.ide.dialogs;
import java.util.ArrayList;
import java.util.List;