I think what you described is code folding. Emacs/Vim has that too. And more to ... | Hacker News

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tuhdo on Nov 21, 2014 | parent | context | favorite | on: CotEditor – Text Editor for OS X

I think what you described is code folding. Emacs/Vim has that too. And more to that. Look for the demos in my other answer in this thread.

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