Set more generous minimums. Flicker seems to have nothing to do with minimum size. I get it even for fairly large dimensions after scaling down from a much larger size. Similar to issues with zoom from about a month ago, before unc0rr fixed them.

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#include <QApplication>

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#include "mainform.h"

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int main(int argc, char *argv[])

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{

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    QApplication app(argc, argv);

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    MyWindow *mainWin = new MyWindow;

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    mainWin->show();

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    return app.exec();

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}