Unencrypted parts of message are added to encrypted part

[fx5]

pre can contain parts of an unencrypted message here: https://github.com/IRCrypt/ircrypt-weechat/blob/master/ircrypt.py#L264

An attacker without access to the password can use this to create messages that look like they were encrypted by someone with access to the password.

My message here >CRY-0 some_replayed_message