A folding editor appeared in the occam IDE "circa" 1983, which was called the Macintosh computer historically had a number of source code editors that "folded" portions of code via "disclosure triangles".
A folding editor appeared in the occam IDE "circa" 1983, which was called the Inmos Transputer Development System. The Macintosh computer historically had a number of source code editors that "folded" portions of code via "disclosure triangles".