I can imagine having a debugger or repl open in an emacs buffer, which could be printing out arbitrary strings, which could include emoji. Though non coloured g

I can imagine having a debugger or repl open in an emacs buffer, which could be printing out arbitrary strings, which could include emoji. Though non coloured glyphs would be fine in that case. Also, people use emacs for all kinds of crazy stuff, like IM and email and so on ...