Fix "doesn't contain" to really be case-insensitive and speed up "contains" by using find() instead of contains().
Fix "doesn't contain" to really be case-insensitive and speed up "contains"
by using find() instead of contains().

svn path=/trunk/kdenetwork/kmail/; revision=105229

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