[kmail2] [Bug 403795] New: Messages with shared nonexistent In-Reply-To are not grouped

[FeepingCreature]

https://bugs.kde.org/show_bug.cgi?id=403795

            Bug ID: 403795
           Summary: Messages with shared nonexistent In-Reply-To are not
                    grouped
           Product: kmail2
           Version: 5.7.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: default_357-line at yahoo.de
  Target Milestone: ---

When using Atlassian Stash to manage a software project, we are delivered mails
for every change made to a project. To make its work easier, Stash sends these
emails with a shared In-Reply-To header that does not exist. As a result, the
messages are not threaded.

Example:

First email:

Message-ID: <PROJECT-repo-1-1234 at Bitbucket>
In-Reply-To: <PROJECT-repo-1 at Bitbucket>

Second email:

Message-ID: <PROJECT-repo-1-5678 at Bitbucket>
In-Reply-To: <PROJECT-repo-1 at Bitbucket>

In case that a set of emails is found that reply to the same parent, but the
parent does not exist, the earliest email of the set should be considered the
parent.

I've had a look at messagelib:/messagelist/src/core/model.cpp, but it's very
spaghetti-like and I'm scared to mess with it.

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