Update smithay with layer shell updates

[ids1024]

Update to smithay from Smithay/smithay#1819.

Some changes are needed to adapt to Smithay/smithay#1817. Even after looking at the changes there, I'm not entirely sure how the replace configure_serial and current_serial...

[ids1024]

Reading though the relevant smithay code again, and the uses of this in cosmic-comp, I think I've fixed how last_acked is used now. Using the .current() cached state where applicable.

[ids1024]

This should fix pop-os/cosmic-epoch#2199, though that appears to be an inconsistent race condition that may not be easily reproducible.

The layer arrange fix works as expected when starting the panel with sleep 5 && cosmic-panel then showing the workspaces overview before that timer runs out. After the change, the workspaces view is resized to make room for the panel exclusive zone, which did not happen before.

[Drakulix]

Looks mostly good to me

[Drakulix]

Can't we simplify this whole thing with the new with_committed_state helper or am I misunderstanding how that works internally? Seems to me, that we don't need to manually check the ack'd serial.

[ids1024]

Yeah, I guess with_committed_state() would work here; though we also use states.data_map, in addition to the states.cached_state, to get the current_server_state().

I guess it wouldn't really be a problem to take the with_states lock twice (but not at the same time) here? Though it might not simplify things much.

[ids1024]

Rebased and updated to smithay commit including fix in Smithay/smithay#1853.