[BUG] Mouse wheel sends arrow keys (prompt history navigation) instead of scrolling conversation in Warp

Preflight Checklist

• [ ] 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?

Description
In an interactive Claude Code session inside Warp, scrolling with the mouse wheel
navigates prompt history (as if Up/Down arrows were pressed) instead of scrolling
the conversation. The footer shows: "Scroll wheel is sending arrow keys · use PgUp/PgDn to scroll".

Steps to reproduce

1. Open Warp and run claude.
2. Have a conversation long enough to require scrolling.
3. Scroll up with the mouse wheel / trackpad.

Expected behavior
The conversation viewport scrolls.

Actual behavior
The prompt input cycles through history. Only PgUp/PgDn scroll the view.

Environment

• Claude Code version: 2.1.295
• Warp version: 0.2026.10.07.08.29.stable_00
• OS: macOS
• Shell: bash
• TUI mode: <fullscreen / default; check "tui" in ~/.claude/settings.json>
• CLAUDE_CODE_DISABLE_MOUSE set: <yes/no>

Workarounds tried

• PgUp/PgDn (Fn+Up/Down on MacBook): works
• Removing "tui": "fullscreen" from settings.json: didn't help
• CLAUDE_CODE_DISABLE_MOUSE=1: didn't help

Additional context
Related: #73878, #65833

What Should Happen?

Scroll wheel must correctly scroll terminal window and do not use it like arrows

Error Messages/Logs

Steps to Reproduce

I do not know, it occured in a random moment

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.295

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Warp

Additional Information

_No response_