Codex's TUI emits alternate-screen toggles (DECSET/DECRST 47/1047/1049),
scrollback-erase (CSI 3 J), and mouse-tracking enables (?1000-1007) during
startup and on every repaint. xterm.js obeys them: it switches to the
scrollback-less alternate buffer, wipes saved lines, and forwards the scroll
wheel to codex — so the user's conversation history both disappears and
becomes unreachable on each tab switch / pane refresh.
Strip these sequences in two places, leaving the visible-viewport erases
(2J / J) intact so codex can still repaint its own rows:
- Session._handleTerminalOutput: filter the live SSE/WS stream and the
persisted terminal buffer at the source, for mode === 'codex'.
- GET /api/sessions/:id/terminal: apply the same strip to the replayed
buffer (ALT_SCREEN_TOGGLE_PATTERN / ERASE_SCROLLBACK_PATTERN) so a
tab-switch replay keeps full scrollback.
Adds test/codex-terminal-output.test.ts covering the strip (alt-screen and
3J removed, 2J/J preserved, Ctrl+L redraws preserved) and confirming codex
output passes through without Ink row-repair mangling.
Co-Authored-By: Saqeb Akhter <saqeb.akhter@gmail.com>
