[kmail2] [Bug 388045] New: Sorting by date does not apply to mail groups

[Konstantin Kharlamov]

https://bugs.kde.org/show_bug.cgi?id=388045

            Bug ID: 388045
           Summary: Sorting by date does not apply to mail groups
           Product: kmail2
           Version: 5.7.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: Hi-Angel at yandex.ru
  Target Milestone: ---

Using "Aggregation = mailing list" and "Sorting = by date and time" results in
threads ordered only by date of the first mail. This is a major inconvenience,
because for looking into mailing list you can't tell which threads was updated
and which wasn't.

In contrast, e.g. Thunderbird for sorting takes into attention all mails within
a thread, i.e. if some old thread got a new mail, the mail group gets bumped.

# Steps to reproduce:

1. Set "View → Message List → Sorting → • By Date/Time"
   and "View → Message List → Aggregation → • Standard Mailing List" 
2. Send yourself a mail "TestOlder"
3. Send yourself a mail "TestNewer"
4. Reply to "TestOlder"

# Expected:

Thread TestOlder gets bumped

# Actual

TestOlder stays in the same order.

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