Only call KWin::setActiveWindow when a mainwindow already exists.
Only call KWin::setActiveWindow when a mainwindow already exists.

Some people don't like new windows getting focus.

svn path=/trunk/kdenetwork/kmail/; revision=97725

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