QAbstractItemModel segmentation fault in QTreeView

[Santosh Reddy]

All the Model-View Interface Implmentations should check for QModelIndex ::isValid() condition and handle it accordingly (safely)

Example:

int ListModel::rowCount(const QModelIndex &parent) const
{
    if(parent.isValid())
        return _data->count(); //root node
    else
        return 0;
}

int ListModel::rowCount(const QModelIndex &parent) const
{
    if(parent.isValid())
        return _data->count(); //root node
    else
        return 0;
}

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