[BUG] Scroll step too large with Logitech MX Master 3S in IntelliJ integrated terminal (regression)

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 using Claude Code inside IntelliJ's integrated terminal, scrolling with a Logitech MX Master 3S mouse produces excessively large scroll steps, making it very difficult to navigate output. This appears to be a regression introduced in a recent Claude Code update.

Environment

• OS: macOS (Darwin 25.5.0)
• Mouse: Logitech MX Master 3S
• Terminal: IntelliJ IDEA integrated terminal
• Claude Code version: latest (regression — worked in a previous version)

What Should Happen?

Smooth, fine-grained scrolling through the output, similar to scrolling in iTerm2 or with a trackpad.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code in IntelliJ's integrated terminal
2. Run a prompt that produces a long output
3. Scroll through the output using a Logitech MX Master 3S scroll wheel

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.181 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

• Scrolling with a trackpad in IntelliJ terminal works fine
• Scrolling with the same mouse in iTerm2 works fine
• The issue is specific to the combination of Claude Code + IntelliJ terminal + high-resolution scroll wheel
• This did not happen before a recent Claude Code update, suggesting a regression in TUI mouse/scroll event handling