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## Why Fixes #21046. Codex TUI 0.128.0 can show Backspace/Delete-related editor shortcuts in `/keymap`, but Windows-style modified Backspace/Delete events were still dropped by the composer because the default editor keymap did not include those modified special-key variants. On Windows/CMD this meant `Shift+Backspace` and `Shift+Delete` did not fall through to normal character deletion, and `Ctrl+Backspace` / `Ctrl+Delete` did not perform the word deletion users expect from Windows text inputs. ## What Changed - Added default editor bindings for `shift-backspace` and `shift-delete` so shifted delete keys keep normal grapheme deletion behavior. - Added default editor bindings for `ctrl-backspace`, `ctrl-shift-backspace`, `ctrl-delete`, and `ctrl-shift-delete` so Windows-style word deletion works when terminals preserve those modifiers. - Added regression coverage for the resolved default keymap and textarea behavior. ## How to Test 1. Start Codex in the TUI on Windows CMD or another terminal that reports modified Backspace/Delete keys distinctly. 2. Type `hello world` in the composer. 3. Press `Ctrl+Backspace`; confirm `world` is removed and `hello ` remains. 4. Type `world` again, move the cursor before it, then press `Ctrl+Delete`; confirm the next word is removed. 5. Type a few characters and press `Shift+Backspace` and `Shift+Delete`; confirm they delete one character in the expected direction instead of doing nothing. 6. Open `/keymap`, inspect the Editor deletion actions, and confirm the modified Backspace/Delete aliases are visible as configurable defaults. Targeted tests: - `cargo test -p codex-tui keymap::tests` - `cargo test -p codex-tui bottom_pane::textarea::tests` - `cargo test -p codex-tui keymap_setup::tests`