Also eat double clicks when trying to select invalid items.
Also eat double clicks when trying to select invalid items.

svn path=/trunk/KDE/kdepim/; revision=706628

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