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
/**
	 * Return the ids of the contexts that are active for
	 * the element that is being decorated. Context ids identify
	 * a command {@link Context}.
	 * @return the ids of the contexts that are active for
	 * the element that is being decorated
	 * @see org.eclipse.core.commands.contexts.Context
	 * @deprecated to be removed before M5
	 */
	String[] getContextIds();
	
	/**
	 * Get the value of the given property or <code>null</code>
	 * if the property does not exist in this context.
	 * @param property the property
	 * @return the value of the given property or <code>null</code>
	 */
	Object getProperty(String property);
	
	/**
	 * Return the properties that exist in this context
	 * (i.e. the set of properties that have values associated
	 * with them.
	 * @return the properties that exist in this context
	 */
	String[] getProperties();
}