Bug 84446 OperationHistory should protect itself better against runtime exceptions
Since clients of the history might rely on getting certain events even if a operation causes runtime exceptions (for example listeners) the history should protect itself better agains runtime exceptions. This envloves: - listeners causing runtime exceptions in the call back - Operation execution causing runtime exceptions. In this case listeners must be informed as well.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/ObjectUndoContext.java
private IContextOperationApprover approver = null;
	private Object object;
	private String label;
	private List children = new ArrayList();
	/**
	 * Construct an operation context that represents the given object.
	 * 
	 * @param object -
	 *            the object to be represented.
	 */
	public ObjectUndoContext(Object object) {
		this(object, null);
	}
	/**
	 * 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)
	 *