Qt 6.7 Windows 11 Bug with Arabic languarge

Christian Ehrlicher

Oh, the RTL in textedit bug - I saw this already somewhere else iirc - it's not easy because the underlying stuff don't support it correctly, sorry.

Volker75

Ok. In worst case the coder can add the webengine to fix the bug. Sadly the webengine is very large, printing is slower and it doesn't work with all compilers.

But the current bug is bad for Arabic Windows 11 users and the only fix i know so far is forcing the fusion style.

Christian Ehrlicher

You can use windows 11 style on a recent windows (maybe with some quirks but for testing purposes) by modifying src\plugins\styles\modernwindows\main.cpp and pass -style windows11 to your app.
But from my pov it's not an arabic problem - it also does not work with english/german when the app is started with -reverse

Volker75

Yes, of course because of right to left / reverse.

hmm... About your "quirks". I sadly don't understand them, also because the last time you explained me that it is impossible:
https://forum.qt.io/topic/153241/qt-6-7-beta1-windows11-style-and-windeployqt
I will buy a new computer next year. (In fact my idea was to wait until Windows 12 is released for the new computer)

I will try tomorrow your quirk. I am coding only in my spare time. My profession is not coding. It's just a hobby, so I am slower then "real" coders.

Christian Ehrlicher

It does not work for pre-compiled version. Adding a hack somewhere to make it run for debugging is not something which should be used for daily work but is good for debugging stuff.
Already have an idea what's going wrong, with the help of 10 lines of code:

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QMenu menu;
    menu.addAction(QString::fromUtf8("Action 1"));
    menu.addAction(QString::fromUtf8("Long Action 2"));
    menu.addAction(QString::fromUtf8("Very long Action 3"));
//    menu.addAction(QString::fromUtf8("أدنى أيام في الأسبوع لكل المدرسين"));
//    menu.addAction(QString::fromUtf8("الجداول"));
//    menu.addAction(QString::fromUtf8("تعديل أنشطة فرعية"));
    menu.exec(QPoint(100, 100));
    return 0;

Volker75

I knew that you are genius :-)
Thank you so much!

Volker75

Maybe also add a sub-item in the example.
Because view the first picture that i posted in the first message here.
You can see that the arrow (>) that shows that there are sub-items is also in the wrong direction. So that should be checked also if someone try to fix this bug.

Christian Ehrlicher

When I'm correct there is no need for it - looks like the QPainter is getting the wrong layout direction for unknown reason.

Volker75

Thank you so much. Sadly I can't answer it. It's much above my level of knowledge. But I am sure you are skilled enough to fix it.

Christian Ehrlicher

Ok, found the problem. It's not really a windows11 style problem but it is getting visible there:

    QMenu menu;
    menu.addAction(QString::fromUtf8("Action 1"));
    menu.addAction(QString::fromUtf8("Long Action 2"));
    menu.addAction(QString::fromUtf8("Very long Action 3"));
    QPixmap pm(400, 400);
    pm.fill(Qt::transparent);
    menu.render(&pm);
    pm.save("D:\\rendered.png");

Now start the program with the option -reverse and compare the saved png with the expected result :)
What we see:

What the png looks like:

Volker75

I must admit that I don't fully understand your answer, but it sounds fine to me.
Of course i will pay my debt as soon as I can see a patch in the bug tracker. Just sent me your IBAN or paypal-email (by the chat in this forum).

Liviu Lalescu

Thank you, @Christian-Ehrlicher ! I understood your answer after I looked at your QTBUG page answer: https://bugreports.qt.io/browse/QTBUG-124931