Showing a GUI application with `showMinmized()` doesn't work on Ubuntu 18.04 and the window is displayed on the screen as if I started it with `showNormal()`.
Note that it works fine on Ubuntu 16.04.
I found that if I execute `mainWindow->showNormal(); mainWindow->sesWindowState(Qt::WindowMinimized);` the window is minimized.
Steps to reproduce this issue:
- open the "Main Window" example
- change `mainWin.show();` in `main.cpp` with `mainWin.showMinimized()`
- recompile and run
-> the window is visible at start