sounds a lot like the 'minimap', which I think was first used in the Sublime editor. There's an emacs version at http://www.emacswiki.org/emacs/MiniMap http://

sounds a lot like the 'minimap', which I think was first used in the Sublime editor. There's an emacs version at http://www.emacswiki.org/emacs/MiniMap http://www.emacswiki.org/emacs/MiniMap that I haven't gotten around to trying yet, but keep meaning to.