For your information, even a simple a text editor (like much of user-facing software) too is comprised of several logically independent pieces, in the spirit of the model-view-controller paradigm.

It depends on how you implement it. I tend to implement mine as part of a compiler/run time, so it’s just another stage for me.

But my point was that any of those editor parts aren’t really identifiable as it’s own thing outside of editing.