More logic to try to cure the seemingly unpreventable unread messages count getting out of sync problem.
More logic to try to cure the seemingly unpreventable unread messages count
getting out of sync problem.

svn path=/trunk/kdenetwork/kmail/; revision=60406

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