wp-fractional-scale-v1: New protocol for fractional scaling

Merged Kenny Levinsen requested to merge kennylevinsen/wayland-protocols:fractional-scaling into main

Previously wp-surface-scale-v1.

This protocols allows for communicating preferred fractional scales to surfaces, which in combination with wp_viewport can be used to render surfaces at fractional scales when applicable.

This protocol behaves similar to wl_surface.scale in wayland!220 (merged), but with a fractional scale rather than an integer.

More test clients available here: https://gitlab.freedesktop.org/kennylevinsen/fractional-scaling

Edited by Simon Ser

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