[kmail2] [Bug 191050] Warning should be shown when Disposition-Notifications haven't come back

[Adrien Cordonnier]

https://bugs.kde.org/show_bug.cgi?id=191050

--- Comment #6 from Adrien Cordonnier <adrien.cordonnier at gmail.com> ---
An MDN is normally a direct child of the message with the MDN request. There is
already the possibility to display messages by threads so the code to find
direct children exists (at least children in the same folder). According to the
"Customize Message Aggregation Modes" window, there are three threading
policies: "perfect only", "perfect and by references", and "perfect, by
references and by subject". Here the subject is likely to be changed (for
example, Kmail replies with the subject "Message Disposition Notification" and
add the original subject in the message body). It is also likely that the MDN
and original message are in separate folders (respectively inbox and
sent-mail).

Kmail displays correctly an MDN as a child of the original message if they are
in the same folder (with "Aggregation/Thread starters" view which uses
threading "perfect, by references and by subject").

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