I doubt it's where it originated, but I was using multi-select/multi-caret editing in jEdit before Sublime came around. That and arbitrary window splitting (sp

I doubt it's where it originated, but I was using multi-select/multi-caret editing in jEdit before Sublime came around. That and arbitrary window splitting (split any pane horizontally or vertically) are two features I really miss when they're not present. The latter's surprisingly hard to find; Sublime and VS Code don't do it (Atom does).