[BUG] Middle-click paste inserts text twice in the TUI (VS Code terminal, Linux X11) — regression of #67857 in 2.1.281

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?

Body:

Description

Middle-click paste (X11 PRIMARY selection) into the Claude Code prompt inserts the text twice
(e.g. selecting anywhere and middle-clicking gives anywhereanywhere).
Same symptom as #67857 (fixed/locked), but still reproducible in 2.1.281.

Environment

• Claude Code 2.1.281 (CLI, running in the VS Code integrated terminal)
• VS Code 1.138.0
• Ubuntu 24.04, GNOME on X11

Steps to reproduce

1. Select a word in any application (VS Code editor, gedit, another terminal).
2. Middle-click in the Claude Code prompt.

Expected

The text is pasted once.

Actual

The text is pasted twice.

Diagnostics

• In a plain bash prompt in the same VS Code terminal, middle-click pastes once.
• Middle-click into Claude Desktop pastes once.
• Right-click > Paste / Ctrl+Shift+V in the Claude Code prompt paste once.
• xinput test shows a single button-2 press/release per click (the mouse is not double-clicking).
• The PRIMARY selection holds the text once.

What Should Happen?

Body:

Description

Middle-click paste (X11 PRIMARY selection) into the Claude Code prompt inserts the text twice
(e.g. selecting anywhere and middle-clicking gives anywhereanywhere).
Same symptom as #67857 (fixed/locked), but still reproducible in 2.1.281.

Environment

• Claude Code 2.1.281 (CLI, running in the VS Code integrated terminal)
• VS Code 1.138.0
• Ubuntu 24.04, GNOME on X11

Steps to reproduce

1. Select a word in any application (VS Code editor, gedit, another terminal).
2. Middle-click in the Claude Code prompt.

Expected

The text is pasted once.

Actual

The text is pasted twice.

Diagnostics

• In a plain bash prompt in the same VS Code terminal, middle-click pastes once.
• Middle-click into Claude Desktop pastes once.
• Right-click > Paste / Ctrl+Shift+V in the Claude Code prompt paste once.
• xinput test shows a single button-2 press/release per click (the mouse is not double-clicking).
• The PRIMARY selection holds the text once.

Error Messages/Logs

Steps to Reproduce

Body:

Description

Middle-click paste (X11 PRIMARY selection) into the Claude Code prompt inserts the text twice
(e.g. selecting anywhere and middle-clicking gives anywhereanywhere).
Same symptom as #67857 (fixed/locked), but still reproducible in 2.1.281.

Environment

• Claude Code 2.1.281 (CLI, running in the VS Code integrated terminal)
• VS Code 1.138.0
• Ubuntu 24.04, GNOME on X11

Steps to reproduce

1. Select a word in any application (VS Code editor, gedit, another terminal).
2. Middle-click in the Claude Code prompt.

Expected

The text is pasted once.

Actual

The text is pasted twice.

Diagnostics

• In a plain bash prompt in the same VS Code terminal, middle-click pastes once.
• Middle-click into Claude Desktop pastes once.
• Right-click > Paste / Ctrl+Shift+V in the Claude Code prompt paste once.
• xinput test shows a single button-2 press/release per click (the mouse is not double-clicking).
• The PRIMARY selection holds the text once.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

21.1.281

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_