Bug Fixes in KDE-PIM
Fix mail loss when the file on disk has an inconsistent name.
E.g. status in akonadi was "unread" but the file on disk had the "Seen"
flag, so marking it as read doesn't need to rename the file, it already
has the desired final name.
(cherry picked from commit 9101a5614f0a109602e085cfe904c6524af1679d)