Spans in QTableView get confused when visual indices are different from the logical indices.

#include <QtGui/QtGui>

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

QTableWidget table(8,4);
for (int i=0; i < table.rowCount(); i++) {
    for (int j=0; j < table.columnCount(); j++)
        table.setItem(i, j, new QTableWidgetItem(QString("item %1,%2").arg(i).arg(j)));
}

table.horizontalHeader()->swapSections(1,0);
table.setSpan(1, 1, 1, table.columnCount());
table.setSpan(2, 0, 1, table.columnCount());

table.show();
return app.exec();
}