Bug 129377 [Viewers] IDecorationContext.getContextIds() comment says it should be removed before M5
There is a similar comment in DecorationContext.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/IDecorationContext.java
/*******************************************************************************
 * Copyright (c) 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
 *******************************************************************************/
package org.eclipse.jface.viewers;
import org.eclipse.core.commands.contexts.Context;
/**
 * A decoration context provides additional information to
 * a label decorator.
 * <p>
 * This interface is not intended to be implemented by clients
 * 
 * @see LabelDecorator
 * 
 * @since 3.2
 */
public interface IDecorationContext {