X11/Gnome: Floating dock widgets don't minimize with mainwindow restored before show

On Linux, if we restore the state of the mainwindow with floating dockwidgets before it is shown (which is where i would expect to call restore), the floating dockwidgets are restored properly but if i minimize the mainwindow, the floating docks are not minimized.

This is exactly the same issue as the one stated here: https://bugreports.qt.io/browse/QTBUG-103474

To compile the repro:

 - Change the CMAKE_PREFIX_PATH with your Qt SDK

 - Run cmake and build

See the video attached to see the issue.

Note: If in the repro you restore the state after the show of the mainwindow, you don't get this behavior