So IDE with syntax highlights? Those blocks things are also pretty much shown in most IDE, what do you use to code?
I even have prettifying turned on so the keywords like in, lambda, etc are prettified.
No somthing more than just “mere” syntax highlightinng or prettifying like e.g. in VS Code. Being able to change line height for a “headline” when you declare a new class. Or maybe lines that illustrate how a temp variable is used. But it’s all vague ideas and I can’t picture or describe it well and you’d have to demo this with a graphical design tool I think.
I use emacs, and it can change font size and font face similar to the font color during syntax highlights. Like in markdown or LaTeX headings are larger font, math formula have their system where superscript and subscript have higher/lower baseline. In org mode it can even convert the whole latex snippet into formula and display as image, or show inline images. And in rust it has type hints and other information overlayed along side the code you wrote, it even adds little buttons on tests you can click to run them.
So I think what you want can probably be made easily if you have a solid grasp of what you want. Emacs is basically extensible using a programming language (elisp) so technically there’s nothing you can’t do logic wise, there might be some limitations on displaying things though.
