Move message from deltachat folder and back will delete the message

[webratte]

Androidclient: 1.28.0 Gplay version

Setup:

• watch sent folder: diabled
• send copy to self: enabled
• move to deltachat folder: enabled
• only read deltachat folder: enabled

What happens:

1. receive a message
2. move this message to a other IMAP folder (e.g. using k9)
3. move this message back to the deltachat folder
4. As soon as deltachat is connected, the message will deleted from the server

Part 2: A other thing, maybe related: If I send a message via k9 to a known chat (same receiver, same senderaddress and BCC to my senderaddress) the message will not shown in DeltaChat. I think, I remember, in the past it worked. It's a rare usecase, so maybe it's not that important?!

I attached a logfile (only for the first part of this issue). deltachat-log-20220208-141748.txt

[gerryfrancis]

@webratte Thank you for your report, I can confirm this issue (part 1).

[adbenitez]

this is an issue of the deltachat core, not related to the android app, the issue is that Delta Chat's core removes duplicated messages

[link2xt]

This is a duplicate of #3130 and was fixed in #3138.