Now there's a name I haven't heard much in the last decades. Before I switched from Windows to MacOS I used their demo editor SciTE as my text editor of choice and was very happy with it.
Probably you never had to develop specialized text editors - the Scintilla library is very precious.
I remember wondering why it wasn't a widespread feature, and then realizing that the common ingredient in all the editors I was looking at was s Scintilla.