Wayland 1.15 & Weston 4.0 Officially Released

The Wayland 1.15 update is fairly small but comes with some API additions, now mandates in the documentation that the get_subsurface function be double-buffered to reduce rendering glitches, Wayland-Scanner improvements, LibWayland-EGL has been pulled into Libwayland rather than living in mesa, and various other improvements as outlined here.
As usual, the Weston reference compositor changes are a bit more lively. Weston 4.0 is the new version due to once again having API/ABI breakage. Weston 4.0 brings initial atomic mode-setting support, Input-Timestamps protocol support, drops the older XDG-Shell protocol revision, and has various bug fixes and many other improvements.
Overall, a nice update for a half-year worth of work in the Wayland upstream space.
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