[Bug 302186] 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

--- Comment #1 from Björn Hendriks <kde at bhendriks.de> ---
Thanks to a start-up tip I found out that you can set up special filter actions
to add, remove, or modify mail header entries. So, I added a filter to remove
the "References" header which could be triggered by menu or toolbar item.

Applying that filter to a message with wrong references actually removed the
header as expected. But, the mail remained at its place within the thread even
after restarting KMail. During restart I made sure no kmail-related process
kept running.

Even worse, when I tried to undo the filter action it made KMail crash. After
restart nothing was changed. The header was still not there, but the mail still
kept its position within the thread.

These results led to more details of this feature wish:
 * Don't crash on undoing a remove header filter (or don't offer that)
 * Update the mail thread relations on change of headers
 * Offer a recursive change of the reference headers, such that all subsequent
thread messages keep their reference to the changed message. AFAICS this could
not be achieved with the current filter actions.

Should I make separate reports of the crash and/or the missing mail thread
update?

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