There certainly should be no need to worry about multiple threads from
the same client. I think you can work on the assumption that the
programmer who wrote the client is not insane! This is the way commit
for wl_surface works, right?
The per-client pending mode is probably cleanest, but I suspect a single
pending mode shared by all clients, where a commit from any one causes
it to be used in whatever state it is in, will work acceptably. It just
seems like two privileged clients doing this at the same time and not
being aware of each other is unlikely. Also results in a better final
state if one of the clients only changes one of the outputs, in that it
won't "undo" the changes made by the other client to the other output.
Fixing this per-client would require you to store modified flags, not
just the final state.
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