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Hiding the System Menu Icon of QMdiSubWindow | Qt Project forums | Qt Project
Wed 30 Jul 2014 04:35:37 PM CEST - permalink -
QList<QMdiSubWindow > subWindows = ui->mdiArea->subWindowList();
QMdiSubWindow mySubWindow = subWindows.at(0);
mySubWindow->setWindowIcon(QIcon());
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https://qt-project.org/forums/viewthread/7932