Keep absolute order in the subject-based threading cache. If two messages with the same subject have exactly the same date then order by pointer value.
Keep absolute order in the subject-based threading cache.
If two messages with the same subject have exactly the same date
then order by pointer value.

Fixes the assert() triggered when removing mails from the view.


svn path=/trunk/KDE/kdepim/; revision=937811

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi