Ok, maybe I missed it but today it caught my eye.
You have a function node open with a lot of code.
See below
You start to scroll
Notice how the first line of the block of code doesn't scroll.
Neat. 
This was introduced to VS Code a few releases back (quite a few actually) and so undoubtedly made is way into Monaco. It is indeed a very nice feature. The summary line is clickable as well, particularly useful for collapsing a long function.
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