Messages cut off / trimmed down — no way to rewind to view full content

Summary

During long conversations, messages sometimes get cut off or trimmed down — either in the terminal display or after context compaction. There is currently no reliable way to rewind or scroll back to see the full original content of earlier messages.

This is distinct from issue #394 (rewind/restore failing to revert code changes) — this is about message content visibility.

Expected Behavior

• All messages should be fully viewable at any point in a conversation
• Rewind / session history should preserve the complete text of every message, even after /compact or long sessions
• If display truncation is intentional (for performance), there should be a way to expand or view the full message

Actual Behavior

• Messages appear truncated or cut off in the terminal
• After compacting or in long sessions, earlier message content is partially or fully lost
• No command to view the original full text of a prior message

Steps to Reproduce

1. Start a long conversation with multiple exchanges
2. Issue several tool calls and receive long responses
3. Use /compact or continue until context is large
4. Try to scroll back or rewind to earlier messages
5. Message content is missing or truncated

Context

This affects the ability to review what was previously discussed, copy earlier outputs, and maintain continuity in long coding sessions. Related: #394 (rewind/restore), #411 (fork conversation), #435 (copy last message).

Command Code Version

0.26.25

Operating System

macOS (likely affects all platforms)

issue ではファイル、テスト、エントリポイントが特定されていません。長い会話、ツール呼び出し、/compact を使って問題を再現し、その後、ターミナル表示と rewind/session-history の経路を追跡してください。完了条件は、圧縮後も元の全文を表示できるか、展開できることです。