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Use the IN_FORMATS_ASYNC blob (as opposed to the normal IN_FORMATS blob) to determine which formats/modifiers are supported. This will allow the client to allocate buffers which can actually be async flipped. In order to guarantee that the most optimal modifier is always used we also need to force a modifier renegotiation when swicthing between sync and async flips. Otherwise eg. sync flips might end up using a less optimal sync+async modifier instead of a more optimal sync-only modifier. Signed-off-by: notbabaisyou <though-went-some-simple@proton.me> Link: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1816