In D11838#238728, @dhaumann wrote:

Personally, I dislike the idea of passing options in createView for a very simple reason: we have document variables, .kateconfig files, settings on the UI, the command line, the ConfigInterface. Adding yet another way to configure KTextEditor sounds like a bad idea.

In D11838#238269, @ngraham wrote:

So what's our path forward here? Is there a way to only turn on line numbers for Kate itself, and not for the katepart?

In D11838#238269, @ngraham wrote:

That said, I'm still struggling to understand what the problems is with line numbers in Kile. Most of the editors listed at https://beebom.com/best-latex-editors/ have line numbers on by default, including TeXmaker, which is what all of my scientist friends use. Screens are wider than ever before, and average users are going to just maximize the window anyway, making the small amount of horizontal space taken up by the line numbers a non-issue.

I don't think that this is ok for Kile.