Bug 88352 Operation supports leaks contexts via action handler
I20050315-1100 Susan, this is a different leak from the one that I reported. Test Case: 1. open text editor 2. close text editor ==> DefaultUndoManager is leaked due to undo/redo actions handlers still holding on to the context.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/ObjectUndoContext.java
/**
	 * Construct an operation context that represents the given object and has a
	 * specialized label.
	 * 
	 * @param object -
	 *            the object to be represented.
	 * @param label -
	 *            the label for the context
	 */
	public ObjectUndoContext(Object object, String label) {
		super();
		this.object = object;
		this.label = label;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IUndoContext#getLabel()
	 */
	public String getLabel() {
		if (label == null)
			return object.toString();
		return label;
	}
	/**
	 * Return the object that is represented by this context.
	 * 
	 * @return - the object represented by this context.
	 */
	public Object getObject() {