setModelData for subclassed QItemDelegate

[T4ng10r]

In setModelData for my delegate I perform this code

void ShipComponentDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,  const QModelIndex &index) const
{
	QString name = index.model()->data(index, Qt::DisplayRole).toString();
	QSize size(0,0);
	QVariant var = QVariant(size);
	model->setData(index, var,Qt::SizeHintRole);
	size = model->data(index, Qt::SizeHintRole).toSize();
}

void ShipComponentDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,  const QModelIndex &index) const
{
	QString name = index.model()->data(index, Qt::DisplayRole).toString();
	QSize size(0,0);
	QVariant var = QVariant(size);
	model->setData(index, var,Qt::SizeHintRole);
	size = model->data(index, Qt::SizeHintRole).toSize();
}

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size taken from model after setting should be the same as above. But it isn't. I thought first time that I made some error with values inserted into size and it is invalid. But no - in every other case with all other values - it doesn't want to change internal data.
To clarify all - in setEditorData() I fill this index with my size - then after changes I want to bring this size to previous value.