Make the diff bpf plugin honor the display strategy set by the calling readerwindow.
Make the diff bpf plugin honor the display strategy set by the calling
readerwindow.

svn path=/trunk/kdepim/; revision=346750

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