TUI duplicates last assistant message + footer in scrollback on long replies

Environment

• Claude Code: 2.1.119
• Model: Opus 4.7 (1M context)
• Terminal: xfce4-terminal
• $TERM: xterm-256color
• OS: Linux 6.8.0-107-generic (Ubuntu)
• Shell: bash

Description

After a long assistant reply (200+ lines) completes, the entire last block — assistant message body, ※ recap line, divider, ❯ prompt, and status footer (token counter, mode banner, statusLine) — appears 2-3 times consecutively in scrollback. Sometimes the session start banner also re-renders. Reviewing past output is painful because the same content scrolls past 2-3x.

Repro

1. Launch claude in xfce4-terminal.
2. Send a prompt that produces 300+ lines of output (e.g., "read settings.json and summarize every top-level key in 2-3 sentences each").
3. After completion, scroll back through scrollback.
4. Expected: each block appears exactly once.
5. Actual: the last assistant block + footer (and sometimes session banner) appears 2-3x in succession.

Already ruled out

• Custom statusLine (bash …/statusline-venture-git.sh) — replaced with echo 'Claude | alex', duplication still occurs.
• Cached statusLine wrapper (10s TTL) — duplication still occurs.
• Stop / PostToolUse hooks — none of the configured hooks emit the duplicated content (verified by grep).

Hypothesis

TUI re-paints the static "below-the-fold" footer when terminal viewport reflows, and previous frames leak into scrollback instead of being cleared. Possibly an Ink/React render issue interacting with xfce4-terminal's alt-screen handling.

Pasted scrollback example available on request.