Consistent width / height in FScreen when resizing window in Unity Editor

When testing in free aspect window in Unity editor, if you resize the window, the width and height are no longer valid as soon as the screen orientation is not the same as the initial orientation.

You can test with the Banana demo, if you start in landscape mode and resize to portrait mode, the game is no longer adapted to the screen size as it has wrong width and height returned by Futile.screen.

I'm aware this is not a critical issue as it only happens in the Editor (unless you can resize dynamically the web player too?), but this modification is handy to check orientation change in real time in the Unity Editor (as long as you test (Futile.screen.width<Futile.screen.height) to decide is your layout is in portrait mode).