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67d34a1
(Get the code!)
On further inspection - we're *not* missing a damage event. When adding counters for our thread-proxy messages, damage events received, and swap_buffers sent XMir definitely receives a Damage event and sends a swap_buffers call in reply. It would appear that the buffers we're submitting have a 1-frame delay between rendering and display.
This could be because XMir is rendering to the wrong buffer, or it could be because Mir is doing something crazy, like triple buffering.