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ddidderr 5c5d916960 fix: close the RV6 verification gaps

Resolves the 7 gap groups in docs/rewrite/notes/review-rv6-codex.md
(final-Z8.md):
- crash (macOS): request_abort_dump returns false on mach_msg receive
  timeout/error so the signal-path fallback runs; EXC_SOFT_SIGNAL keeps
  the signal number in the minidump exception info.
- Default SHELL read as an OS string and stored in encoded command form.
- macOS executable search works on raw PATH bytes; the default path is
  used only when PATH is unset.
- Windows: config env overrides are decoded; EnvMap compares keys as
  WTF-16 units with per-unit Unicode simple uppercasing (no lossy
  conversion, distinct lone-surrogate keys stay distinct).
- +show-config writes original bytes for encoded OS data, so export +
  reload round-trips; UTF-8 configs are byte-identical as before.
- Zig's ensureLocale chain lives in ghostty-os for all Unix targets and
  is used by both the GTK app and the C API init.

Also makes the quick-terminal GTK replay test independent of compositor
focus: GTK's is-active is read-only, so when niri actually focuses the
layer surface the simulated focus-out cannot drive autohide and that
assertion is skipped (the production logic is unchanged and matches Zig).

Test Plan:
- cargo test --workspace (3390 passed, incl. tests/gtk_replay.rs)
- just check-macos (both), just check-windows, just check-wasm

2026-10-12 10:27:37 +02:00

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Z8: RV6 remaining gap groups

crash: request_abort_dump returns exception::abort_reply_ok(mach_msg rcv result); timeout/error falls back to the signal-path report. MachException::minidump_subcode keeps the subcode for EXC_BAD_ACCESS and EXC_SOFTWARE/EXC_SOFT_SIGNAL (signal number). Tests in exception.rs (platform independent); mach glue checked by just check-macos.
Default SHELL: getenv_os + shell_from_env (EncodedOs encoding) in config.rs; test shell_from_env_round_trips_bytes.
macOS exec search: exec_candidates works on bytes with the raw var_os("PATH") bytes (default path only when PATH is unset); tests exec_candidates_*.
Windows env overrides: apply_env_overrides decodes keys/values (config_str_to_os); env_overrides_are_decoded (cfg(windows), compiled by check-windows).
EnvMap on Windows compares keys as WTF-16 units upcased per unit (Unicode simple mapping, single BMP result only, surrogates unchanged); windows_key_tests run everywhere.
+show-config writes config_str_to_bytes(formatted) (format_config_bytes) so raw bytes are emitted; UTF-8 output unchanged. Test show_config_round_trips_non_utf8_and_fdd0_paths.
Locale: full ensureLocale chain now in ghostty-os/src/locale.rs posix module (all unix; libc dep moved to cfg(unix); cocoa step stays Apple-only). GTK init_locale now delegates to it (unsafe removed there). Chain tested via a mock Sys trait. core::global::init_lib already calls ensure_locale, so the C API gets it.

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Z8: RV6 remaining gap groups

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