FYI: The Primeagen made a great video / meme about my diagram. https://www.youtube.com/watch?v=E_8B_seg8AI. I had a good laugh when someone emailed me about it and then watched it. Check it out if you haven't already.

I said the same thing about Select Mode when I first discovered it and had to work it into the diagram. I still don't use it today. But I wanted to show all vim modes in the diagram, and I was having fun trying to make the diagram without any crossing lines.

See vim/vim#13091 - A bug about the undocumented mode mentioned in this diagram was just fixed in vim and therefore nvim.

'd' and 'y' appear to be missing, but I'm assuming that it is intended that the lozenge labeled 'operator' is intended to cover these cases.

Is there a key or additional information which further defines these, perhaps enumerating the possible cases? For the 'Printable Character, NL or CR', but a list of known operators would be quite helpful for the learner.

What I've been looking for is some sort of state machine description or transition diagram or table which delineates valid normal mode commands. Meaning, those which end up either modifying the buffer, or end up with a value landing in a register, something like that. This is as opposed to a sequence of keystrokes that are nonsensical, and end up being ignored and dumping you right back to normal mode with no pending commands being authored. For instance, dm appears to be meaningless, and just results in landing back in normal mode as if you hadn't pressed any keys at all.

Another case of interest to me is something like dvvvvvvvvvvvvj, which seems to be equivalent to dvj. I'm not sure why this would be allowed, but it is.

Maybe the information I'm looking for is present, and I'm just not seeing it?