[BUG] Terminal Scrollback is Completely Broken in 2.1.150

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?

The new interface for viewing things like plans breaks terminal scrollback. When a plan exceeds the height of the terminal, Claude Code CLI switches to a mode where you have to use the mouse wheel to view it. There might be a keyboard combo for this, but the normal mechanisms one uses (e.g.: Shift+PageUp) do not work.

What Should Happen?

Claude Code should support scrollback through the regular methods that have worked in terminal emulators for decades.

Error Messages/Logs

Steps to Reproduce

Create a long plan or make your terminal vertically small, then try to view it. This breaks in Konsole, GNOME Terminal, and Alacritty.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.148

Claude Code Version

2.1.150

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_