Diff: Open Patch as Diff
diff.openPatchFile Open the active .patch/.diff file's first file-section as a structured (side-by-side) diff.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Diff: Open Patch as Diff, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.