[Regression since 6.2] QDialog as main frame does not accept any user inputs: app looks frozen

Compile and deploy the "tabdialog" example under Android (I'm running Android 9, could not test more recent versions). The dialog shows up but looks frozen, no user input is accepted, you cannot even click the OK or Cancel buttons.

This is because the main frame class (named "TabDialog" in the sample code) derives from QDialog. If you change it to derive from QWidget or a QMainWindow, it works fine.

For instance, "calculator" example works fine, because its main frame class (Calculator) is a QWidget.

I'm migrating from 6.2.2 to 6.9.0. With 6.2.2 using a QDialog works perfectly fine.