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Draft: protocol: add wl_surface.scale_factor

Joseph Burt requested to merge surface-scale-factor into main

This adds the ability for clients and compositors to communicate non-integer scale factors, and is backwards-compatible with output scale.

Parents and sub-surfaces must always share the same scale factor. Since sub-surfaces are positioned in the parent's surface space, and root surfaces are positioned in the compositor space, this aligns sub-surfaces with each other and, if properly scaled, with hardware pixels.

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