[kmail2] [Bug 337232] New: Kmail filtering on IMAP ignores mails already read with other agents

[mau]

https://bugs.kde.org/show_bug.cgi?id=337232

            Bug ID: 337232
           Summary: Kmail filtering on IMAP ignores mails already read
                    with other agents
    Classification: Unclassified
           Product: kmail2
           Version: 4.12.5
          Platform: Debian testing
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: b-misc at gmx.ch

I have the following setup:
Several IMAP resources.
One local maildir resource.
Several filters which should move mails from the IMAP resources to the local
maildir resource, when kmail is started/running.

The filters work great for mails which arrive when it runs.
If I start it e.g. in the evening, it moves some mails which I received during
the day, but others stay in the IMAP inboxes. It seems that only "virgin" mails
I didn't "touch" during the day get filtered/moved, while mails I have already
read (e.g. in the web browser), stay in the inbox (even if I set them to unread
again).

I found a similar bug report for a mail client from Mozilla [1], but not for
kmail; they discuss this topic in detail, arguing that this was the expected
behaviour earlier but that this is regarded as a bug today.

I think kmail's behaviour should be changed, since most people look at their
mails also using portable devices or online.

Please move the report if it's handled by akonadi.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=566873

Reproducible: Always

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