after fixing some issues wrt ecc keys, see #1319,
and waiting some time (three core releases, two ios/android/desktop releases),
it is now the time to switch again to ecc keys again,
after the first attempt was stopped in #1319
before, the list was empty
and trying to send to groups that only contain SELF lead to a crash.
in theory, this happens for both, bcc_self enabled or not, however,
if bcc_self was disabled (default setting),
things worked as the whole mimerendering was skipped on a higher level.
also, the saved-messages-chat was not affected as this was checked explicitly.
this pr changes the mimerendering so that From: is used as To:
if there is no recipient-list and the messasge will be sent to SELF only.
the currently released versions fail sometimes in encrypting to ecc keys,
see #1313, the issue is about to be fixed,
however, we should not generate ecc keys until the
fix is rolled out - otherwise new users will get encryption errors every some
messages if their counterpart is not yet using the most recent version.
we can start generating ecc keys a few weeks after the fix is rolled out.
up to now, Chat-Group-Member-Added and -Removed commands
result in a complete recreation of the memberlist
by collecting all addresses from the From: and To: headers.
this easily results in missed and accidentally removed members,
esp. when several people at the same time scan a qr code to join a group.
this commit changes the behavior of adding members by
not removing members on the Chat-Group-Member-Added command.
instead the existing memberlist is conjuncted
with the memberlist seen in the message.
only adding the member from the Chat-Group-Member-Added
seems not to be sufficient - imaging a group of Alice and Bob:
- Alice adds Claire
- Bob adds Dave _before_ seeing that Alice added Claire
- Dave would never get the information that Claire is in the group
wrt Chat-Group-Member-Removed: this command
does no longer recreate the memberlist but just remove _exactly_ the member
mentioned in the header. there are situations, where a just removed member
will be readded by out-of-order-messages, however, compared to missed
members, this is seems to be acceptable - also as this is more visible
and easier to fix (just remove the member again).
might be that, in practise, this is not a big issue. while adding members
is typically done in masses on bootstraping a group,
this is typically not true for removing members.
