[BUG] History scrolls/flashes when typing "/" for slash commands

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When typing "/" to invoke a slash command, the entire conversation history rapidly scrolls or flashes by before the autocomplete menu appears. This creates a disorienting visual experience.

Actual behavior:
The conversation history rapidly scrolls/flashes through the terminal before the autocomplete appears. This is visually disruptive and makes it difficult to use slash commands.

What Should Happen?

Expected behavior:
The slash command autocomplete menu should appear smoothly without affecting the visible conversation history.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Have a conversation with some history
2. Type "/" to start a slash command

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.1

Platform

AWS Bedrock

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_