Code review comment for lp://staging/~alan-griffiths/mir/support-gdk_window_move_to_rect

> Looks good, it isn't clear to me how the positioning feedback will work
> exactly. Will it be via a configure event? Or is that postponed to another
> branch?

I left position feedback out of this MP because it will cause discussion. I need to do some investigation to determine the minimum information needed, and if there's prior art to follow in Weston.