Allow to close source view window by ESC (as done in kmail).
Allow to close source view window by ESC (as done in kmail).

svn path=/trunk/kdepim/; revision=339882

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