Editora 0.20.0. Archived, so links from that release keep working. Read the 0.24.0 page →
Diff: Swap Sides
diff.swapSides Exchange the left and right sides of the active diff.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Diff: Swap Sides, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.