EWMH 1.6 with frame synchronization?

[Po Lu]

Owen Taylor has a frame synchronization protocol for compositing
managers: https://fishsoup.net/misc/wm-spec-synchronization.html.

It is currently only supported by Mutter and cannot be found outside his
blog.  Present does not quite work for this purpose, as the "present
redirection" code was never finalized.  Is anyone interested in
releasing a new version of the wm-spec with the frame synchronization
protocol?  I'd be more comfortable writing code to use it, and maybe
implementing it in more compositors, if it was specified in the actual
wm-spec.

Thanks.