Kate is a great editor. It used to be better in the past, nowadays there are some random bugs popping up from version to version. Actually it was working best

Kate is a great editor. It used to be better in the past, nowadays there are some random bugs popping up from version to version. Actually it was working best with KDE 3.x, KDE 4.x introduced performance problems, KDE 5.x fixed some and added more bugs. Minor stuff anyway and YMMV.