alt Hacker NewsPantograph[0] seems to be a more recent attempt to implement the same idea. It is still not a general editor but generalizing it to ranges of tree selections looks promising
Pantograph[0] seems to be a more recent attempt to implement the same idea. It is still not a general editor but generalizing it to ranges of tree selections looks promising
There are more examples in https://github.com/yairchu/awesome-structure-editors