frame callbacks and sub_surfaces

[Joel Winarske]

> There's https://gitlab.freedesktop.org/wayland/wayland/-/issues/266 about
this.

Thanks, yes I have that book marked.

@pq
I think this approach might better suit our use cases (CI health gate /
client regression testing):
https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/24

I would be happy to push this forward, seeing it hasn't moved much.

Joel
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