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I want to make my Qt Window stay on top. When setWindowFlags(Qt::WindowStaysOnTopHint) is executed, the window becomes hidden (on Windows 7).

I've also tried:

Qt::WindowFlags flags = windowFlags();
setWindowFlags(flags | Qt::WindowStaysOnTopHint);
And, it still does the same. What did I do wrong here?
Qt::WindowFlags flags = windowFlags();
setWindowFlags(flags | Qt::WindowStaysOnTopHint);
show();
Check out http://doc.qt.io/qt-5/qwidget.html#windowFlags-prop
                Nothing wrong with this answer, just that: windowFlags / setWindowFlags is a child of the window you are using. So it might need to be ThisWindow.windowFlags() and ThisWindow.setWindowFlags(...) and ThisWindow.show() depending on your context.
– Owl
                May 30, 2019 at 8:37
        
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