Emacs has actually had that feature for awhile. It's a bit of a mixed blessing, to be honest; while it's great that you don't have to remember to close files w

Emacs has actually had that feature for awhile. It's a bit of a mixed blessing, to be honest; while it's great that you don't have to remember to close files when you're done with them, the asymmetry of the feature (files don't magically open when you want to go back to them after they've been reaped) tends to make it a bit more frustrating than useful to me. It'd be interesting to see a more user-friendly implementation.