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setWindowIcon for QDialog


in LabPlot we have couple of modal dialogs, created on the heap and shown with
dlg->exec().  The dialog icon is set in the constructor of the dialog via
QDialog::setWindowIcon(), e.g.

The icon is set/handled by the window manager if I understand this correctly.
With kwin, the specified icons are not shown and I always get the default
application's icon shown. On windows, this seems to work and I see the proper
icons in the dialogs.

I tried to quit the event loop with

QTimer::singleShot(0, this, [=] () {

in order to call QDialog::setWindowIcon() after QDialog::show() but this
doesn't help.

So, what is the proper way to set the icon that would work everywhere?

Thanks and Regards,