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Signal and Threema want nothing to do with WhatsApp
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
At some point, Android is reading the message to generate the quick replies that were showing in the notification. They're content-aware and this is not a function of Signal; if someone sent me a question, there were "yes" and "no" quick replies. If someone sent that they were going to be late, there were quick replies like "That's OK", etc.