Editora 0.20.0. Archived, so links from that release keep working. Read the 0.24.0 page →
Diff: Stage Current Hunk
diff.stageHunk Stage the selected changed block in the active Git diff.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Diff: Stage Current Hunk, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.