Bug 148755 Add tthe status to the ActivityStackEvent.
If the the event rollback, the ActivityStackEvent status should be ROLL_BACK.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/activity/ActivityStack.java
/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation. 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: Actuate Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.birt.report.model.activity;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Stack;
import org.eclipse.birt.report.model.api.CommandStack;
import org.eclipse.birt.report.model.api.activity.ActivityStackEvent;
import org.eclipse.birt.report.model.api.activity.ActivityStackListener;
import org.eclipse.birt.report.model.api.activity.IActivityRecord;
import org.eclipse.birt.report.model.api.extension.IElementCommand;
/**
 * An implementation of a command stack, called an "activity stack" here. The
 * activity stack manages the execution, undo, and redo of
 * {@link ActivityRecord activity records}.
 * <p>