This esp. speeds up receive_imf a bit when we recreate the member list (recreate_member_list == true).
It's a preparation for https://github.com/deltachat/deltachat-core-rust/issues/3768, which will be a one-line-fix, but recreate the member list more often, so that we want to optimize this case a bit.
It also adds a benchmark for this case. It's not that easy to make the benchmark non-flaky, but by closing all other programs and locking the CPU to 1.5GHz it worked. It is consistently a few percent faster than ./without-optim:
```
Receive messages/Receive 100 Chat-Group-Member-{Added|Removed} messages
time: [52.257 ms 52.569 ms 52.941 ms]
change: [-3.5301% -2.6181% -1.6697%] (p = 0.00 < 0.05)
Performance has improved.
Found 7 outliers among 100 measurements (7.00%)
4 (4.00%) high mild
3 (3.00%) high severe
```
It's a w/a for "Space added before long group names after MIME serialization/deserialization"
issue. DC itself never creates group names with leading/trailing whitespace, so it can be safely
removed. On the sender side there's no trim() because group names anyway go through
improve_single_line_input(). And I believe we should send the exact name we have in our db. Also
there's no check for leading/trailing whitespace because there may be existing user databases with
group names having such whitespaces.
Since switch to async we don't have spurious "database is busy"
errors anymore. Since an error is irrecoverable in most cases,
we can skip the message. The cost of this is we may
accidentally skip a correct message if I/O fails, but
the advantage is that we are guaranteed to never confuse
irrecoverable error with recoverable one and get stuck in
infinite loop redownloading the same message over and over.
That's a bug which @Simon-Laux and probably also @hpk42 had, where one malformed incoming (Spam-) mail blocked the receiving of all emails coming after it.
The problem was that from_field_to_contact_id() returned ContactId::UNDEFINED, and then lookup_by_contact() returned Err.
* Treat multiple From addresses as if there was no From: addr
* changelog
* Don't send invalid emails through the whole receive_imf pipeline
Instead, directly create a trash entry for them.
* Don't create trash entries for randomly generated Message-Id's
* clippy
* fix typo
Co-authored-by: link2xt <link2xt@testrun.org>
If we fetch messages out of order, then f.e. reactions don't work because if we process a reaction not yet having the corresponding message processed, the reaction is thrown away.
* allow deleting referenced contacts in UI
we are quite often getting requests of users
who want to get rid of some contact in the "new chat" list.
there is already a "delete" option,
but it does not work for referenced contacts -
however, it is not obvious for users that a contact is in use,
esp. of some mailing list or larger chat, old contacts, whatever.
this pr revives an old idea [^1] of "soft deleting" referenced contacts -
this way, the user can remove the annoying entry
without the need to understand complicated things
and finally saying that deletion is impossible :)
once the contact is reused, it will reappear,
however, this is already explained in the confirmation dialog of the UIs.
technically, this pr was simpler as expected as we already have
a Origin::Hidden, that is just reused here.
[^1]: https://github.com/deltachat/deltachat-core/pull/542
* update rust doccomment
* update changelog
* avoid races on contact deletion
chats may be created between checking for "no chats" and contact deletion.
this is prevented by putting the statement into an EXCLUSIVE transaction.
* fix failing python test
