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  1. Qt
  2. QTBUG-107585

QMainWindow reappears at different position with QOpenGLWidget in QMdiSubWindow

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 6.4.0
    • GUI: OpenGL, Widgets: Main Window
    • None
    • Windows 10, x64, Visual Studio 2022
    • Windows

      If you put a QOpenGLWidget in a QMdiSubWindow and you add the sub window in a QMdiArea that is the central widget of a QMainWindow, the main window disappears for a moment, then it reappears in a different position.

      A sample code to reproduce the issue:

      QMainWindow* mw = new QMainWindow();
QMdiArea* mdi = new QMdiArea(mw);
mw->setCentralWidget(mdi);
QToolBar* toolbar = mw->addToolBar(QString("Main toolbar"));
QAction* testAction = toolbar->addAction(QString("Test"));
connect(testAction, &QAction::triggered, [=]() { 
  QOpenGLWidget* oglw = new QOpenGLWidget();
  QMdiSubWindow* sw = new QMdiSubWindow();
  sw->setWidget(oglw);
  mdi->addSubWindow(sw);
  sw->show();
});
mw->show();

      (click on the "Test" action to add the sub window)

      The problem only occurs the first time you add the sub window.

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            lagocs Laszlo Agocs
            puffosauro Fabio Dago
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              Created:
              Updated:

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