UI bug: Conversation text repeats and grows continuously

Bug Description

The Claude Code UI has a rendering bug where the conversation text continuously repeats and grows as the conversation continues. The entire conversation history appears to be reprinted multiple times, making it difficult to read new responses.

Environment

• Claude Code Version: 2.0.28
• OS: macOS 15.6 (Build 24G84)
• Terminal: iTerm.app
• Terminal Type: xterm-256color
• Terminal Size: 80x24
• Model: claude-sonnet-4-5-20250929

Steps to Reproduce

1. Start Claude Code session
2. Have an extended conversation (multiple back-and-forth exchanges)
3. Observe text output as conversation continues
4. Text appears to repeat/reprint the entire conversation history

Expected Behavior

New assistant responses should appear below previous messages without reprinting the entire conversation history.

Actual Behavior

The entire conversation appears to be reprinted multiple times, causing the text to grow continuously and making it difficult to read new content.

Additional Context

• Issue becomes more noticeable as conversation length increases
• Appears to be a terminal rendering/display issue rather than actual duplicate content