Git: Blame — Detect Moved and Copied Lines
git.blame.detectMoves Make blame follow lines moved or copied within and between files (git blame -M -C), in this window.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Git: Blame — Detect Moved and Copied Lines, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.