Not much is broken by this and i'd say that the breakage of chat assignment of partially downloaded messages is rather good (because private replies in groups are more rare than "normal" ones), so this shouldn't cause compatibility issues.

test_remove_member_bcc() is really testing the wrong thing, it was originally testing with unencrypted messages. But this is broken since key-contacts introduction when all the tests got encrypted, so no need to fix it for this PR. I think we don't have tests that look into encrypted payload with a MIME parser.

test_remove_member_bcc() is really testing the wrong thing, it was originally testing with unencrypted messages. But this is broken since key-contacts introduction when all the tests got encrypted, so no need to fix it for this PR. I think we don't have tests that look into encrypted payload with a MIME parser.

Need to fix it up anyway because it starts failing with this PR. But sure, it doesn't test what is expected, i'll try to create a follow-up PR then.