QStandardItemModel presents bad data to QSortFilterProxyModel on update

The following example will have in invalid index as the input to QSortFilterProxyModel::filterAcceptRow().

#include <QtGui>

class Filter : public QSortFilterProxyModel
{
public:
Filter(QObject *parent = 0)
: QSortFilterProxyModel(parent)
{}
virtual bool filterAcceptsRow(int row, const QModelIndex &parent) const

{ qDebug() << row << parent << "isValid" << sourceModel()->index(row, 0, parent).isValid(); return true; }

};

int main(int argc, char *argv[])
{
QCoreApplication app(argc, argv);

QStandardItemModel model;
Filter proxy;
proxy.setSourceModel(&model);

QList<QStandardItem *> rows;
rows.append(new QStandardItem("foo"));
model.appendColumn(rows);
return 0;
}

I would not have expected isValid() to return false.

Update: You can work around this bug by appending rows one at a time instead of appending one column list.