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Emacs has done this for years.

• guardian5x 12y ago
  And at least a hundred other editors. I don't get this post.
  • rdtsc 12y ago
    People get to talk about their favorite editor. So it gets upvoted. Programmers love to talk about their tools.
  • paperwork 12y ago
    Is it a common feature to lay out a single file in multiple columns? Not split panes. Not the same file split into two with two independent scroll bars. Multiple columns the way a single article is spread across multiple columns in a new paper?