Window size not always remembered

[Florian Boucault]

Steps to reproduce:

1. Launch window_size QML program
2. Resize the window
3. Close the window
4. Re-launch the program

Expected result:
Size of the window was saved and reused when launching the app the second time.

Current result:
Only the width of the window is correctly saved and re-applied. The height is back to the default size specified in the QML Window element.

[Florian Boucault (fboucault)]

Note that the issue is only reproduceable by some people on some systems. We were not able to figure out what the difference was between those systems