[avar]

Aside from the UX question you've got, which I haven't had time to look at (sorry). We've shipped a pure C version of "add -i" that's been on if you've enabled feature.experimental=true since v2.29.0.

It looks like the ball may have been dropped on opting users in to it by default, but in any case there's numerous bugs in "git add -p" and "git add -i" that got fixed along the way, and fixing existing ones should be a lot easier now.

Note: I've also worked on the perl compiler/interpreter in a past life, so it's not that I'm afraid of hacking on Perl, but doing so in the context of the Git project is and was always particularly painful. If something's written in C you could use all the APIs git had internally, but anything in .sh or .perl was usually stuck parsing text, or reinventing the wheel.