In the akonadi console, one can set and remove IMAP flags. This works, but it seems that the following happens: 1. the flag changes are made 2. the message is copied 3. the message is deleted (keeping the copy) Steps 2 and 3 are, of course, superfluous. In akonadiconsole, one can see that indeed the UID (remote ID) is stepped up. (One does not see the marked-as-deleted-but-non-expunged message in akonadiconsole, which is not good, but that's another issue. Also, the remote ID field is an editable field, whereas it should not be.)
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Still present.