[Bug 302186] New: Wish: Remove or add mail's reference header to change thread grouping of messages

[Björn Hendriks]

https://bugs.kde.org/show_bug.cgi?id=302186

            Bug ID: 302186
          Severity: wishlist
           Version: unspecified
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: Wish: Remove or add mail's reference header to change
                    thread grouping of messages
    Classification: Unclassified
                OS: Linux
          Reporter: kde at bhendriks.de
          Hardware: Debian testing
            Status: UNCONFIRMED
         Component: message list
           Product: kmail2

KMail has the nice feature to aggregate messages by thread. As far as I can see
this is mainly done by the "References:" header of the mails.

Unfortunately, it happens every now and then that unexperienced mailing list
users start a new discussion thread by answering to an existing mail. This
inserts a wrong reference to another thread and, of course, KMail appends the
offending mail to that thread. Less often -- to my experience -- it happens
vice versa, i. e., a user continues a thread without answering, so the correct
reference gets lost and KMail shows that message as start of a new thread.

It would be nice to have a context menu item to locally correct the broken
thread grouping in both cases. The easier one would probably be a menu item
"ungroup" which removes the wrong "References:" header and moves the message to
be a new thread head.

Less important -- but also nice -- would be a "group" menu item which offers to
select another message, inserts that as (additional) reference message and
moves the message accordingly.


Reproducible: Always

Steps to Reproduce:
1. Choose a well populated message list
2. Configure it to be grouped by thread (seems to be standard if not changed)
3. View all headers of a message not at head of thread and see "References:"
header
Actual Results:  
"References:" contains one or several message-IDs of messages further up the
thread or none if message is head of thread.

Expected Results:  
See details

This wish is about my KMail 1.13.7 of my up-to-date Debian Testing
installation. Please ignore if KMail2 has already such a feature. The report
interface didn't offer to select kmail1.

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