> But why does emacs have that functionality? GNU Emacs is a 36 year old tool that's been targeted at programmers its entire life, is built on an interactive L

> But why does emacs have that functionality? GNU Emacs is a 36 year old tool that's been targeted at programmers its entire life, is built on an interactive Lisp environment, and actively encourages external improvements and contributions. The more interesting question is why _wouldn't_ it have that functionality.