Hrm. Still not quite what I crave.

Here's roughly what I want. I want to be able to highlight some block of code, ask the AI to modify it in some way, and then I want to see a diff view of before/after that lets me accept or reject changes.

LLMs often get code slightly wrong. That's fine! Doesn't bother me at all. What I need is an interface that allows me to iterate on code AND helps me understand the changes.

As a concrete example I recently used Claude to help me write some Python matplotlib code. It took me roughly a dozen plus iterations. I had to use a separate diff tool so that I could understand what changes were being made. Blindly copy/pasting LLM code is insufficient.