TL;DR;
Bot can change avatar and nickname to impersonate people, but a [bot] label is shown and the profile on click is still the bot ones.
This feature is particularly useful for bridge bots.
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I say we do a header Chat-Bot-Impersonate containing the alias name, but there is the question whether that field should be encrypted, to mitigate meta data collection (as example in mega groups).
Technically we might need a new column in the message table and thus a new database version so it would make sense to combine implementing this with bot buttons in order to only add one new db version & migration function.
For api the message object will have one more property bot-impersonate-alias and 3 methods: has_impersonate_alias and getter and setter functions for the property.
related pull-request: impersonate: allow to override sender name by r10s · Pull Request #2231 · deltachat/deltachat-core-rust · GitHub
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