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9f5e608c61
This change simplifies updating the gossip timestamps when we receive a message because we only need to know the keys received in Autocrypt-Gossip header and which chat the message is assigned to. We no longer need to iterate over the member list. This is a preparation for PGP contacts and member lists that contain key fingerprints rather than email addresses. This change also removes encryption preference from Autocrypt-Gossip header. It SHOULD NOT be gossiped according to the Autocrypt specification and we ignore encryption preference anyway since 1.157.0. test_gossip_optimization is removed because it relied on a per-chat gossip_timestamp.