https://gitlab.synchro.net/main/sbbs/-/commit/fbe34d8b32fcc7ef18cee1a1
Modified Files:
src/conio/cg_events.m src/syncterm/syncterm.h
Log Message:
Quartz: map Command (not Option) to Alt; Option reserved for IME

Quartz keyDown previously routed the Option modifier into the AT
scancode table's .alt slot. That conflicted directly with macOS's
input-method system: Option-H/E/I/N/U/grave are dead-key composition
triggers, so AppKit buffered the keystroke waiting for the follow-up
letter and the view's keyDown: never fired -- making half a dozen
Alt-letter shortcuts (Alt-H hangup chief among them) silently dead.

This commit flips the modifier mapping:

- Command -> Alt for the scancode table (Cmd-H now produces the
Alt-H AT scancode 0x2300, Cmd-B = Alt-B, etc.).
- Option is no longer a modifier check anywhere in keyDown:; it's
left to AppKit's input method, so dead-key composition and
foreign-keyboard layouts work normally. Composed characters
arrive via NSEvent.characters and flow through the existing
cpchar_from_unicode_cpoint() codepage translation, so CP437's
accented letters (�, �, �, �, ...) get folded onto their
codepage bytes when typed via Option deadkeys.

- Cmd-Q and Cmd-V remain reserved for the macOS quit / paste
conventions and are intercepted as CIO_KEY_QUIT / CIO_KEY_SHIFT_IC
before the Cmd->Alt path takes effect.
- Opt-Enter (toggle fullscreen) and Opt-Left/Right (snap resize)
are also unchanged; these don't conflict with deadkeys because
Return / arrow keys aren't IME composition triggers.

- The codepage gate for diacriticals drops the previous "ch < 128"
check; the unmapped fallback parameter does the right thing for
high-Unicode codepoints (returns 0 when the codepage doesn't map
them, falling cleanly through to the scancode table).

ALT_KEY_NAME / ALT_KEY_NAMEP / ALT_KEY_NAME3CH on Apple builds change
from "OPTION"/"Option"/"OPT" to "COMMAND"/"Command"/"CMD" so help
text generated from those macros reads "Cmd-B" instead of "Opt-B".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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