On: Tree Sitter and the Complications of Parsing Langu...

[spiralx]

I recall that as well, my guess would be Sublime Text. Ah, it might have been this plugin for Atom, I was using that for a while:

https://github.com/davidleghorn/atom-focus-mode

Edited to add that I found this for VS Code which I might try:

https://marketplace.visualstudio.com/items?itemName=imagio.v...

[azeirah → spiralx]

I think I met this feature specifically in an editor made specifically for markdown and markdown only.

Although I can definitely imagine this being a plugin in different editors