QStyledItemDelegate doesn't take in consideration the Qt::ItemIsUserCheckable flag in initStyleOption

In QStyledItemDelegate::initStyleOption a check indicator will be added according to the data stored in the role Qt::CheckStateRole ; more precisely if the this data is valid.

v4->index = index;
QVariant value = index.data(Qt::CheckStateRole);
if (value.isValid() && !value.isNull()) {
    v4->features |= QStyleOptionViewItemV2::HasCheckIndicator;
    v4->checkState = static_cast<Qt::CheckState>(value.toInt());
}

From my understanding of Qt::ItemIsUserCheckable, this flag should be checked from the model for the given index even before considering polling the data for this index.