Simplify and speed up calc_sort_timestamp()
#7312
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This mechanism replaces `Chat-Verified` header. New parameter `_verified=1` in `Autocrypt-Gossip` header marks that the sender has the gossiped key verified. Using `_verified=1` instead of `_verified` because it is less likely to cause troubles with existing Autocrypt header parsers. This is also how https://www.rfc-editor.org/rfc/rfc2045 defines parameter syntax.
Create unprotected group in test_create_protected_grp_multidev The test is renamed accordingly. SystemMessage::ChatE2ee is added in encrypted groups regardless of whether they are protected or not. Previously new encrypted unprotected groups had no message saying that messages are end-to-end encrypted at all.
…mp_sent This makes `calc_sort_timestamp()` a continuous function of the message timestamp, simplifies the SQL query and prepares for creation of a db index for it so that it's fast. Currently it doesn't uses indexes effectively; if a chat has many messages, it's slow, i.e. O(n).
Tested on some random chat, the SQL query took 1.411202ms (vs 6.692714ms before) in median. Still looks a bit slow, but already better.
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This is separated from closed #7180 . Everything related to fixing #7308 is removed. "Messages are end-to-end encrypted." is reordered in
test_outgoing_encrypted_msg(), but as there are corner cases anyway (see #7308 ), this isn't important and shouldn't block code simplifications. The current code is hard to maintain and slow, i.e. it looks at every message in the chat, this doesn't scale.Tested on some random chat, the SQL query took 1.411202ms (vs 6.692714ms before) in median. Still looks a bit slow, but already better.
Even if we decide that we don't want to add one more index to the db, the first commit has value on its own. There's no issue reference because there's no new work, i just moved the useful part of the closed PR here.