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
OperationHistoryEvent.ABOUT_TO_UNDO, 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 added.
	 */
	protected void notifyAdd(IUndoableOperation operation) {
		OperationHistoryEvent event = new OperationHistoryEvent(
				OperationHistoryEvent.OPERATION_ADDED, this, operation);
		preNotifyOperation(operation, event);
		for (int i = 0; i < fListeners.size(); i++)
			((IOperationHistoryListener) fListeners.get(i))
					.historyNotification(event);
	}
	/*
	 * Notify listeners that an operation is done executing.
	 */
	protected void notifyDone(IUndoableOperation operation) {
		OperationHistoryEvent event = new OperationHistoryEvent(
				OperationHistoryEvent.DONE, this, operation);
		preNotifyOperation(operation, event);
		for (int i = 0; i < fListeners.size(); i++)
			((IOperationHistoryListener) fListeners.get(i))
					.historyNotification(event);
	}
	/*
	 * Notify listeners that an operation did not succeed after