Option to show emails flagged as \deleted

[150d]

Is your feature request related to a problem? Please describe.

IMAP does not necessarily remove a email from a folder when a user selects "delete", but only mark it as "deleted". Currently, messages that are marked-as-deleted are not handled any differently from mails that are not (the marking is completly ignored.)

Describe the solution you'd like

1. The marked-as-deleted mail should not be included in the message list by default.
2. There should be an option to "include marked-as-deleted mails". If (and only if) the user selects this options, the marked-as-deleted mail should be listed again, being clearly marked (e.g. "stricken-through".)
3. When the marked-as-deleted mails are listed, the user should be able to remove the "deleted" marking of the current mail.

Describe alternatives you've considered

There are none. The marked-as-deleted handling is part of the IMAP standard. Workarounds such as moving the mail between folders are no replacement.

Additional context

No response

[ChristophWurst]

Thanks for the request.

The technical description is difference between the \deleted tag and expunge.

It's correct that this app hides emails marked for deletion.

Showing them would be an option, although our app expunges right away after flagging for deletion.

[150d]

That is not the experience I'm having:

I connected the app to my main email account the other day. The inbox contains a few hundred messages, with about half of them marked-as-deleted.

The Mail app shows this folder in full, including the marked-as-deleted messages. I have not found a way to hide them.

Also, the marked-as-deleted messages remain there intentionally, I do not want to expunge the folder.

[ChristophWurst]

I see. Then please help debug it. Open one of these emails and copy the ID from the URL. It will look like apps/mail/box/8469/thread/8143096. Copy the ID in the end, 8143096 in my case.
Then run the following DB query: SELECT id, flag_deleted FROM oc_mail_messages WHERE id = <id>;.
Share the output.

[150d]

Ok, I'll check that.

In the meantime, one more detail:

When I select the Mail view for the first time (after login to Nextcloud), the marked-as-deleted mails are not included in the message list. After a moment (e.g. 2-4 seconds) the list is updated and the marked-as-deleted messages appear between the non-deleted.

This happens again after logout/login, still with the same messages (deleted and non-deleted.) It does not depend on newly-arrived messages or not.

Does this make sense to you?

[150d]

I ran the db query on one of the messages that are marked-as-deleted, but still shown in the message list:

URL: /apps/mail/box/563/thread/11791

MariaDB [myserver]> SELECT id, flag_deleted FROM oc_mail_messages WHERE id = 11791;
+-------+--------------+
| id    | flag_deleted |
+-------+--------------+
| 11791 |            1 |
+-------+--------------+
1 row in set (0.001 sec)