On DeltaChat/ArcaneChat Android, there is a useful “Mark as read” button. However, when selecting read messages, I would be happy to see a “Mark as unread” button, instead.
Yes, that would be a very useful feature, which by the way it is missing in most IM apps.
Duplicate of Mark Chat as Unread, which also has another dup, Mark messages as unread. 
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My apologies. I must have forgotten to search for open issues.
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