[BUG] Spacing problem in Jetbrains IDE (CLion) pane

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?

There is much too much space between characters in the pane where CC is running.

❯ The spacing in the CLion terminal is fine. It's just in the
CC pane that there's a problem.

⏺ Got it - so the issue is specifically with how the Claude Code
pane is rendering in CLion, while the regular CLion terminal
displays correctly with the same font settings. This indicates the
problem is with how the CC pane itself is rendering text in
CLion.

Since:

• The CLion terminal works fine
• Restarting didn't help
• Changing fonts didn't fix it
• The issue is isolated to the CC pane

This is almost certainly a bug with the Claude Code integration in
CLion. You should report this at
https://github.com/anthropics/claude-code/issues and include:

• That you're using CLion on macOS (Darwin 24.6.0)
• The character spacing is too wide in the CC pane specifically
• The regular CLion terminal displays normally with the same font
• You've tried JetBrains Mono and other fonts without success
• A screenshot showing the spacing difference between the CC pane

and normal terminal

Screenshot is attached.

<img width="2672" height="1464" alt="Image" src="https://github.com/user-attachments/assets/8ddb357f-2ace-4afa-9eb3-e66264f099c7" />

What Should Happen?

Output in the Claude Code pane should look like the output in the terminal pane (both are visible in the screenshot).

Error Messages/Logs

Steps to Reproduce

N/A

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

N/A

Claude Code Version

$ claude --version warn: CPU lacks AVX support, strange crashes may occur. Reinstall Bun or use *-baseline build: https://github.com/oven-sh/bun/releases/download/bun-v1.3.5/bun-darwin-x64-baseline.zip 2.1.12 (Claude Code)

Platform

Other

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_