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fix(terminal): page the CLI transcript for opencode's hollow local buffer

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opencode's TUI runs on the ALTERNATE SCREEN (measured on 1.18.31: tmux
`alternate_on=1`, `history_size=0`), so tmux keeps no history for the pane and
the browser's normal buffer never grows past one screen (`baseY === 0`). The
plain wheel therefore scrolled a buffer with nothing in it — dead in every
opencode tab, on desktop and touch alike.

opencode is not a forwarding candidate: it IGNORES SGR wheel reports (six
`\x1b[<64;…M` reports against an idle pane left the capture byte-identical),
but it does page its own transcript on PageUp/PageDown (`messages_page_up/down`,
verified on the same pane). The hollow-buffer rescue already sends exactly those
keys — it was just gated to `claude`. Widen the gate to opencode so the wheel
and touch gestures reach the CLI's own transcript instead of a no-op.

Every other mode stays out: shell/pi own real terminal scrollback, and
codex/gemini/antigravity/grok/deepseek/omp page-key behaviour is unverified
(docs/scrollback-fix-plan.md).

Test: test/terminal-scroll-routing.test.ts — new opencode case (Red before the
fix, Green after); the "real local scrollback is untouched" case now also pins
antigravity as not-paged.
This commit is contained in:
Randalix
2026-10-08 14:28:59 +02:00
parent ac94f339ac
commit 5a0018fc86
4 changed files with 74 additions and 30 deletions
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docs/scrollback-fix-plan.md
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@@ -279,7 +279,7 @@ Touch is always-local by design, and Claude sessions keep content in the normal
- The viewport-at-bottom gate stays: once the user scrolled up locally, wheel stays local until they return to bottom.
- 40ms SGR coalescing: never send per-event writes to the server.
- Strip parity triangle: `session.ts` live strip ↔ `session-routes.ts` replay strip ↔ `_sessionUsesServerMouseStrip()` in the frontend. If you touch mode lists, update all three.
- Don't add `opencode`/`antigravity` to any strip/forward list; their TUI wheel behavior is unverified (documented at `_shouldForwardWheelToApp`).
- Don't add `opencode`/`antigravity` to any strip/forward list; their TUI wheel behavior is unverified (documented at `_shouldForwardWheelToApp`). ⚠️ 2026-09-16: opencode's half is now MEASURED — 1.18.31 ignores SGR wheel reports but pages its transcript on PageUp/PageDown — so it belongs in the **paging** list (`_localScrollbackIsHollow`), which is not a strip/forward list. antigravity/grok/deepseek/omp remain unverified.
- The chunk-boundary sequence carry in `_handleTerminalOutput` must not be weakened.
## Testing (per repo rules)