I know you're a KDE fan - i prefer gnome [we can agree to disagree!].
I have used Kate and Kwrite in the past but i don't find they sit that
happily installed on a gnome desktop although i do agree that they are
a better app in some respects.

Kedit which i thought was the KDE equivalent of gedit is almost
perfect for me but again doesn't sit too happily on gnome.

I think perhaps medit is best for me. But i'm shortly about to switch
to xfce as gnome is due to disappear i gather.