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/DefaultOperationHistory.java
* an attempt to execute, undo, or redo was made.
	 */
	protected void notifyNotOK(IUndoableOperation operation) {
		OperationHistoryEvent event = new OperationHistoryEvent(
				OperationHistoryEvent.OPERATION_NOT_OK, this, operation);
		preNotifyOperation(operation, event);
		for (int i = 0; i < fListeners.size(); i++)
			((IOperationHistoryListener) fListeners.get(i))
					.historyNotification(event);
	}
	/*
	 * Notify listeners that an operation was redone.
	 */
	protected void notifyRedone(IUndoableOperation operation) {
		OperationHistoryEvent event = new OperationHistoryEvent(
				OperationHistoryEvent.REDONE, this, operation);
		preNotifyOperation(operation, event);
		for (int i = 0; i < fListeners.size(); i++)
			((IOperationHistoryListener) fListeners.get(i))
					.historyNotification(event);
	}
	/*
	 * Notify listeners that an operation has been removed from the
	 * history.
	 */
	protected void notifyRemoved(IUndoableOperation operation) {
		OperationHistoryEvent event = new OperationHistoryEvent(
				OperationHistoryEvent.OPERATION_REMOVED, this, operation);
		preNotifyOperation(operation, event);
		for (int i = 0; i < fListeners.size(); i++)