feature-request: "Tidy" like in jsfiddle and "Collapse" like in plnkr

[dmitry-kurmanov]

Hello! Thanks for the great idea and implementation! I've found it very useful!

It would be great if you will add these features:

• "Tidy" like in jsfiddle
  

• "Collapse" like in plnkr
  

[christianalfoni]

@dmitrykurmanov Hi and glad it is useful :)

I do not have much time on my hands, but I see codemirror has a fold plugin. So that should be pretty simple. I think prettier would do a better job than beautify, as I think plnkr has. Anyways, actually was implementing it, but was not sure how to interact with it. But will solve it like CodeSandbox, just make a button.

Just doing some refactoring now, so will get to this as soon as I have time :)