problem with the sort indicator in QHeaderView QT5

[melman]

Sort display image does not match the sort order.
code:

QSqlRelationalTableModel *model = new QSqlRelationalTableModel();
model->setTable("records");
ui->tableView->setSortingEnabled(true);
connect(ui->tableView->horizontalHeader(), 
            &QHeaderView::sortIndicatorChanged,
            this, &MainWindow::on_sortChanged);
ui->tableView->setModel(model);
model->select();

slot:

void MainWindow::on_sortChanged(int index, Qt::SortOrder order)
{
    qDebug() << index << order 
          << ui->tableView->horizontalHeader()->sortIndicatorOrder();
}

when i click to header, i see:

but qDebug print:
0 Qt::SortOrder(DescendingOrder) Qt::SortOrder(DescendingOrder)
I tried Qt 5.7.0 and Qt 5.6.2
It's a QT bug or I doing something wrong?

[SGaist]

Hi and welcome to devnet,

Are you running a Gnome desktop environment ?

[melman]

@SGaist Thanks! No, it's KDE (Kubuntu 16.10 x64)

[SGaist]

Can you check with your distribution provided Qt ?

Also, can you try with one of KDE's application like KMail or any other that uses a QTableView ?

[melman]

@SGaist Kontact and Krusader apps has the same bug.

[melman]

Build application on Windows 7. No bug.

[SGaist]

Then it looks rather like a KDE Theme issue. You should check with them.

[mtrch]

I think it is a "feature" in Qt style code:

Some UI developers thinks, that "^" is ascending sort indicator, other thinks it is a descending sort indicator.
Qt platfom-dependend styles (QWindowsVistaStyle, QMacStyle, QGtkStyle, etc..) will draw indicator using current OS & theme settings, platform-independend styles (QFusionStyle, QWindowsStyle) will draw it as hardcoded in Q***Style.cpp