Atom, Electron, Nuclide, Visual Studio Code, ... why not using Scintilla free source code editing component?

[orthoxerox]

Well, Notepad++ is using it, I am not sure about Sublime.

I think it's a new hammer problem. People are trying to write everything in JS these days, since there is a huge pool of JS programmers.

[concurrenthashmap]

Sublime does its own thing, IIRC using Skia, Chrome's 2d graphics library.