docs(input): document custom-keymap workaround for unreachable Alt-s on macOS Terminal.app - #390
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…on macOS Terminal.app PR #387 correctly removed the composed-char rewrite for ç/ß in map_macos_composed_char, but that left Alt-s (split_selection_on_newline) physically unreachable via Option+s on macOS terminals without kitty keyboard protocol support (e.g. Terminal.app), breaking the advanced-selection scenario for those users. Rather than reintroduce the layout collision, this documents the existing custom Helix keymap overlay (#350) as a working, zero-regression-risk path: remapping a plain, unambiguous key to split_selection_on_newline resolves to the same canonical Alt-s a real keystroke would produce. Alt-c has the same theoretical reachability gap but currently has no executable command behind it in the trainer at all, so there is nothing to document a workaround for; that gap is tracked separately in #389. Fixes #386
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August 9, 2026 22:43
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Summary
ç/ßcomposed-char rewrite frommap_macos_composed_charto fix a layout collision (map_macos_composed_char rewrites plain ç/ß to Alt-c/Alt-s on non-US keyboard layouts #381/Two map_macos_composed_char entries may be mismapped against the real macOS US Option+Shift layout (˝→Alt-J, ¯→Alt-_) #382), but that leftAlt-s(split_selection_on_newline) unreachable via Option+s on macOS terminals without kitty keyboard protocol support (e.g. Terminal.app), breakingadvanced-selection.toml'ssplit_selection_newlines_001step.key_mapping.rs/behavior change is made here — the custom Helix keymap overlay (feat(input): support custom Helix keymap remapping #350) already provides a working, zero-regression-risk path (remapping a plain key tosplit_selection_on_newlineresolves to the same canonicalAlt-s). This PR documents it: a new README subsection, a CHANGELOG entry, a scenario hint, and one regression test confirming the remap-to-canonical-Alt-chord resolution.Alt-chas the same theoretical reachability gap but has no executable command behind it in the trainer at all, so no workaround is documented for it; that gap is filed separately as Alt-c (CMD_CHANGE_SELECTION_NOYANK) has no executable command behind it #389.Test plan
cargo nextest run --workspace --all-features --lib --bins(2215 passed)cargo nextest run scenario(277 passed)cargo +nightly fmt --checkcargo clippy --all-targets --all-features --workspace -- -D warningsRUSTDOCFLAGS="--deny rustdoc::broken_intra_doc_links" cargo doc --no-deps --workspaceFixes #386