wayland: Add support for the fractional scale protocol
source link: https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/5763
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wayland: Add support for the fractional scale protocol
April fools!
No, really. The fractional scale protocol is just a way to track the surface scale, but not a way to draw fractional content. This commit uses it for that, so tht we don't rely on tracking outputs.
This also allows magnifiers etc to send us a larger (integer) scale if they would like that, that is not represented by the outputs.
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