fix up down motions in lines with tab characters
fix up down motions in lines with tab characters

BUG: 186915

svn path=/trunk/KDE/kdelibs/kate/; revision=939499

cmacq2/kate,hlamer/kate,hlamer/kate,jfmcarreira/kate,jfmcarreira/kate,jfmcarreira/kate,sandsmark/kate,DickJ/kate,DickJ/kate,sandsmark/kate,sandsmark/kate,DickJ/kate,hlamer/kate,hlamer/kate,sandsmark/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,cmacq2/kate,DickJ/kate,cmacq2/kate