Any chance something similar can be done in IDEA?
Or does IDEA have something already like this in the Scala plugin that I've missed?
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IDEA has Scala script support.
It also has REPL with full editor support. That's all. You can add a request (http://youtrack.jetbrains.com/issues/SCL), if you think you really need it, I think it's possible to implement.
That's a great feature, I've seen it before with Java in Eclipse, I think it's called Scrap Pad or so in the platform API. Definitely an upvote here. I'm seeing this left/right split between input and output for the first time, interesting idea.