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Stop Thunderbird automatically marking next message as read after delete

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After upgrading to TB 39 I find that when I delete a message in the message list it automatically marks the next mail in the list as read. How can I configure to TB to stop doing this?

After upgrading to TB 39 I find that when I delete a message in the message list it automatically marks the next mail in the list as read. How can I configure to TB to stop doing this?