Comment 4 for bug 690151

Shouldn't it be the same as in the default text editor?

In any event, I think all text editors treat tabs the same (ie as above)
unless you specify you want tabs replaced by spaces.

I tried explicitly changing the default text editor in the preferences from Default (xdg) to specifically specify kwrite
which is a fairly standard text editor, but it made no difference.
(kwrtie is actually my system default text editor, but I thought it worthwhile to make sure)