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At least that's what I think it does, since it's never the answer on any stackoverflow post about this problem.

yeah, that's right.  Git doesn't track renames or copies in the index; it uses heuristics to determine if a changeset looks like a rename or a copy.

Thanks for the confirmation! Do you happen to know how this works behind the scenes? Does it store renames _at all_ or is it determined at `log`-time?

At log/diff time only.  There are some options you can change to tune how Git detects renames (<https://git-scm.com/docs/git-diff#git-diff---break-rewritesltngtltmgt>, <https://git-scm.com/docs/git-diff#git-diff---find-renamesltngt>).  I think `--diff-algorithm=minimal` will probably also boost the chance of identifying renames too, but maybe only by tuning those 2 options listed.

Hmm too bad, thanks for elaborating though.