Large messages downloaded later are sorted to the end of the chat

[link2xt]

I have download limit enabled on desktop and phone just for testing. Large videos and images that I download later are sorted to the end of the chat or near the end of the chat rather than replacing the message.

It happens with the core compiled from the master branch, not sure if stable has the same bug. Better develop a failing test on master and then try if it also fails on stable.

[link2xt]

The fix is probably to remove timestamp=excluded.timestamp here:
https://github.com/deltachat/deltachat-core-rust/blob/061d091c971ac8cb860f92e6e81c298dcffa8f26/src/receive_imf.rs#L1213

But the fix needs a test reproducing the bug and fixed by the patch.

[iequidoo]

@link2xt for some reason i can't reproduce this on master. I added assert(false); to a new test so that chats of Alice can be seen in the log, but messages there appear in the correct order

[link2xt]

Closed by #4801, we can always open a new issue if there are some problems remaining.