Comment by thangalin

My cross-platform, FOSS text editor, KeenWrite[1], does something similar[2]. Pressing Ctrl+Space inserts the nearest matching variable into the text.

[1]: https://keenwrite.com/

[2]: https://youtu.be/CFCqe3A5dFg?list=PLB-WIt1cZYLm1MMx2FBG9KWzP...