WIP: xwayland: Compute and set screen size and position
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Unlike XRandR, the Wayland output layouts may have outputs placed at negative offsets.
Make sure to compute the size and also the actual location of the screen based on all outputs size and position.
Closes: #899