Bug: Always on top state doesn't persist through making the window full screen and back.

[Trannosaur]

I'm not sure what the proper fix would be, but I can see the problem is in onVisibilityChanged in main.qml

When you go into full screen it strips the Qt.WindowStaysOnTopHint flag, and presumably doesn't restore it.

onVisibilityChanged: {
    var enabledAlwaysOnTop = root.visible && root.visibility != Window.FullScreen;
    systemTray.alwaysOnTopEnabled(enabledAlwaysOnTop);
    if (!enabledAlwaysOnTop) {
        root.flags &= ~Qt.WindowStaysOnTopHint;
    }
.....