Non-modal QDialog instance with QWinWidget parent is not minimized when the main window is minimized

If the main window of an application with an open non modal QDialog based dialog is minimized, on linux the non modal dialog is minimized too.

This does not work, if the mentioned non modal dialog is based on QWinWidget in a simple win32 application.

A patch for a test case based on the winwidget example showing the issue is appended

How to reproduce:

1. apply patch to winwidget example
2. compile winwidget example
3. start winwidget example
4. minimize main window

What happens ?

The additional non modal window is not minimized

What is expected ?

The additional non modal window should be minimized too