[kmail2] [Bug 331891] Broken references-chain (email header) leads to new Thread

[Andreas Hartmetz]

https://bugs.kde.org/show_bug.cgi?id=331891

--- Comment #8 from Andreas Hartmetz <ahartmetz at gmail.com> ---
Copy of the commit message for convenience:

Fix threading of Jira e-mail notifications

Jira e-mail notifications coming from https://issues.redhat.com are
semi-randomly split into two separate threads for each Jira key because
the `References:` e-mail header contains multiple values but only the
first value can be used to reliably construct the threads.

This commit makes messagelib use the first value in the `References:`
header instead of the last one to make the threading work as expected
for Jira e-mail notifications.  I have been using this patch for two
years without observing any unexpected side effects.

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